I I L, L, c0 ntents Volume 16 No 3 August 2013 ron s Message from Gill Owens the editor ...... • ...... • ...... 2 Art and Architecture The theatre of 3D concrete ...... 4 Technical New cement cleans and enables 100% recycling of spent motor oils...... 8 Demonstrating the effectiveness of the new cement ...... 9 Dr Chota Mota Ia interchange lands top SAlCE award ...... 10 Fulton Awards recognition for Dr Chota Mota Ia bridge ...... 12 The Concrete Institute discusses the six main reasons why floors fail ...... 13 Standalone concrete repair division established ...... 15 Top 10 tips for choosing a concrete flooring contractor ...... 16 Precast Concrete Zambian roads to be upgraded with concrete block paving ...... 18 Exciting new paving finishes soon available ...... 19 Doing it yourself in British Columbia ...... 20 Now it's concrete cabins for photovoltaic farms ...... 22 Precast concrete poles replace vandalised steel poles ...... 24 CBP used in Shovagakula Paving Project ...... • ...... 25 Mandela Barlow Street transformed ...... 26 Women in Costruction Awards honour Women in Construction ...... 27 Talent transcends gender at Lafarge ...... 28 Achieving women at Ash Resources ...... 30 Realising women's untapped potential ...... 30
Products & Services Innovative cement gets sleeper contract steaming ahead ...... 32 Simply 'plug and poke' for great concrete ...... 34 Push to specify readymix concrete ...... 36 Sika launches new premises in Port Elizabeth ...... 37 Accelerators bring benefits to winter concreting ...... 38 A new in-situ waterproofing system from Mapei ...... 39 a.b.e Construction Chemicals opens a dustless powder plant ...... 40 Diamond Products launches the Titan wall saw ...... 41 Roof tile machine designed specifically for Africa launched by PMSA ...... 42 New 'green' non-chloride accelerator from Chryso S.A...... 43 Hydrophobic admixtures improve durability and impermeability ...... 44 Swiss watches inspire accurate moisture measurement ...... 45 NPC goes back to their roots ...... 46 News For your diary ...... 48 100 years of Slurry ...... • ...... 49 Cover picture: The Concrete Institute heralds a new dispensation ...... 50 Lift and staircase US $2-million sustainable construction competition ...... 51 shaft, Ribadeo, Galicia, New PPC Builder's App will make building easy...... 52 Spain. Black-pigmented Best Projects Awards 2013- enter now ...... 52 concrete cast against MBA North appoints new executive director ...... 53 timber-lined formwork., Solidia Technologies wins R&D 100 Award ...... 54 See story on page 4. Free - new title on durability ...... 54 Photograph courtesy Trending videos from Concrete. TV ...... • ...... • ...... • ...... 55 Daniel van der Merwe. THE LAST WORD ...... 56
Concrete Trends is the official quarterly journal of the African Cement & Concrete Industry 7 Bell Crescent, Westlake Business Park, Tokai • PO Box 30875, Tokai, 7966, SA • Tel +27 21 700 4300 • Fax +27 21 702 4340 PUBLISHING DIRECTOR: Errol Bryce email [email protected] hypenica EDITOR: Gill Owens e-mail [email protected] .za ADVERTISING: Anne Colley Tel 082 321 8312 e-mail [email protected] DESIGN, LAYOUT & PRODUCTION : Elise Jacobs email [email protected] -~- REPRODUCTION & PRINT: CTP Printers Cape Town ~ lll]l~~~ . Hypenica accepts no responsibility for any opinions or statements in this publication . Consequently no person connected with the publication of this journal will be liable for any loss or damage sustained by any reader as a result of action following any statements or opinions expressed herein . ISSN 1560-2710 It's time for Africa
Just as Africa is seen as the last frontier of investment for many peaceful transitions of government through electoral nations across the world (and especially China), so more South processes, most recently in Kenya, but also in Ghana, Nigeria African companies are beginning to look at the countries north and Zambia, to name a few. With significant improvements of our borders for new business opportunities. in macroeconomic and political stability, the time for Africa is Vis Shankar, group executive director and CEO ofStandard now," he concluded. Chartered EMEA, talked about the 'climate' at a recent And the interest is mutual - our neighbours are also conference: "It's time for Africa. Improved stability and a rising looking to South Africa and are keen to set up liaisons with consumer class are shaping the country's revived fortunes. At local businessmen. This was amply demonstrated by the large the Milken Institute Global Conference 2013 in Los Angeles, African contingent that attended Hypenica's hugely successful for the first time in its 16-year existence, four panels were Totally Concrete Expo in June. devoted to discuss African opportunities and challenges." Concrete Trends is also following their lead and is aiming Shankar explained, "A decade ago, perceptions of Africa to broaden the scope of its coverage to include more projects were extremely negative. Today there is a buzz about Africa and in our neighbouring countries. I would urge you to contact me the gains are tangible. The continent has managed compound if you are involved in any interesting initiatives north of our real GOP growth of 5, 1% in the last decade, second only to borders. We'd really love to hear from you. Emerging Asia. More than half the world's fastest growing countries are there. ''Trade and investment links between Africa and the rest of Gill Owens, Editor the world are clearly on the uptrend. Governance has improved significantly over the past two decades as evidenced by the
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0 CapeConstnu;tionExpo Cl Cape ConstN The theatre of 3D concrete By Daniel van der Merwe, Architect at PPC Introduction • Surface texture (formwork panels or subsequent Chiaroscuro (Italian for light-dark) in architecture is the surface treatment) use of bold contrasts between light and dark achieved by • Formation of joints between formwork elements manipulating the design of three-dimensional indentations on • Formwork ties and tie holes (position, formation and the surfaces of building façades; by playing with solids and making good) voids, or with shadow-casting projections and recesses. This • Subdivision of the surface (dimensions of formwork gives the building an added aesthetic dimension, making elements, formwork textures, pattern of joints and the architecture theatrical, with the building’s appearance arrangement of formwork tie holes etc) changing through the day depending on the sun’s angle and • Joints (position, direction, width and details) intensity. Louis Kahn, the famous American architect, always • Detailing of corners and edges (e.g. keen, chamfered) incorporated natural light into his structures and believed that • Colouring (selected cements, aggregates, pigments, great architecture is about manipulating the endlessly varying glazing, paints) qualities of light. • Surface finish of areas not cast against formwork Textured concrete Concrete’s ability to be moulded, to reflect the surface qualities of its formwork and surface treatments, and to be tooled post shuttering, enables it to provide a wider range of architectural finishes than any other building material. By utilising concrete’s aesthetic potential as well as its structural properties, cost- effective and aesthetic building solutions are achieved Architectural concrete is a special concrete subject to particular requirements regarding the quality and standard of its appearance; the surface is intended to remain on view after completion. But high-quality off-shutter architectural finishes require special attention. Client, architect, structural engineer, building contractor, formwork and concrete suppliers, must form a co-ordinated team so that what is created is exactly what was planned. Decisions that will impact on the end product must be made at all project stages, and some considerations are highlighted here. The importance of good communication between all parties cannot be sufficiently emphasised and is the key to achieving the desired outcome. Design and specifications for textured concrete Designers must be aware of detailing issues that will affect placement and appearance of the concrete. Issues such as minimum wall thickness to avoid scoring the form surface during compaction; exposing steel reinforcement during post-shutter tooling; and spacing reinforcing bars to facilitate Aluminium formwork system with post-formwork polishing of ridges. concrete placing and avoid honeycombing. For architectural concrete, the architect or designer should In-situ textured concrete versus precast concrete consider several issues which will impact on the visual qualities. While the most appropriate approach will vary from project It is recommended that these be incorporated into the design to project, precast concrete has some advantages over specifications: in-situ work in terms of the range and quality of off-shutter • Visual standard of the architectural concrete finishes that are possible. Precast concrete’s main advantage • Formwork and formwork panel system is that elements are manufactured under factory-controlled 4 CONCRETE TRENDS August 2013 art and architecture art and architecture conditions. The finish and quality are thus generally face to provide a negative mould against which of a higher standard than concrete elements the concrete is cast. constructed on site. Disadvantages of precast Almost any texture or pattern can be concrete are limitations on the size of elements reproduced. Materials commonly used include that can be manufactured, transported to site and styrene foam, rigid plastics and fibreglass, profiled erected by crane, and the inevitability of joints steel sheeting, and elastomeric materials like between panels or beam/column junctions. polyurethane and silicone rubbers. Form liners can become a permanent feature of the finish, Off-shutter textured finishes such as bricks and stone facings. Textured finishes are created by attaching materials Using form liners may be a more economical to the formwork (profiled form liners), or by way to achieve heavily textured finishes over large using textured materials (e.g. aged timber) for the areas, especially if multiple reuses are possible formwork. Subsequent treatments – tooling, bush to offset initial costs. This is usually possible, hammering and abrasive blasting – also produce reducing the cost per square metre. dramatic effects. Textured finishes can also be produced with A new-generation concrete worth considering moulds. Similar to form liners, moulds are used is High Fluid Concrete which produces superior mainly in precast factories for creating repeated finishes without compaction and with reduced patterns. If a pattern/texture is required on both segregation. This is achieved with superplasticising faces, the top surface can be stamped. The mould admixtures that increase concrete flowability can also be designed to produce a recurring, yet without additional water, increasing workability seemingly continuous, pattern over a number of without sacrificing strength. elements. Set retarders can also be used to provide In-situ textured concrete finishes texture and colour; they are applied to the form Form liners are materials placed against the form face to retard the set of the concrete surface. Aluminium formwork system with post-formwork polishing of ridges. art and architecture Once the formwork is stripped, the cement paste on the The joints between adjoining panels, shapes and plywood surface is removed to reveal the aggregates, changing the sheets are difficult to disguise and they are best accentuated by colour and the texture of the surface. Photo-engraved finishes making them a feature. Typically, a rebate/recess that creates a are typical of this method where an image is revealed by shadow line within the surface is used. Rebates range in size altering the depth of exposure of the coloured aggregate using and shape depending on how prominent a feature is desired, varying amounts of set retarder. and whether it is part of a surface pattern that may be used Water washing is also used to expose the aggregates to break up large areas and thereby provide a sense of scale by removing the cement paste prior to the concrete surface to the surface. hardening. While it is mainly used for precast The precise position of joints should be concrete elements, it may be used for in-situ work specified if the surface finish is critical. The in conjunction with set retarders applied to the design of the structure will often determine formwork surface prior to concrete placement. appropriate locations for joints. For column and beam construction, the junction between Post-shutter tooled finishes individual elements is a logical place to locate Tooled finishes involve mechanically tooling or joints). Visually, beams should span from column hammering the off-shutter finish to produce a to column and columns from floor to floor. rough texture. Common methods include bush hammering, point tooling, abrasive blasting and Assessment hammered nib. Providing for test panels reduces costs and Bush-hammered finishes range from removal of enables a better assessment of the contractor’s the surface cement paste (exposing the aggregates) ability to produce the specified finish. With to extensive removal of the matrix and possible careful consideration of the factors necessary to fracturing of the stone. The depth of hammering produce the as-specified finish, the initial test must be specified (typically 1 to 8 mm) and the panel or concrete placement should achieve the appearance verified by a test panel. Note that as required result. It is not possible to assess the the removal of the surface will tend to highlight colour consistency from a single test panel; only any imperfections, a good-quality off-shutter finish the physical characteristics and initial colour of is required. Also, to avoid chipping the edges or the surface can be assessed and used as a control corners, untreated borders some 25 to 40 mm in for the remainder of the project. width should be specified and provided. If some aspects of the finish need improvement, Point tooling provides a very coarse texture the contractor has the opportunity to refine or about 15 mm in depth. The coarse texture is adjust the materials or procedures to achieve suitable for larger elements, and will generally the required outcome. The use of more than remove or conceal any surface imperfections. A one concrete placement as a test panel is often large aggregate should be used. beneficial if minor adjustments are necessary. Abrasive blasting can also be used to remove Colour consistency can also be assessed with the surface paste or matrix around the stone to subsequent placements in non-critical sections expose the coarse aggregate. The depth of removal of the project. should be specified, but to ensure adequate bond Off-shutter textured concrete finishes with the concrete, no more than one third of the can be assessed objectively only if the project aggregate should be exposed. documentation makes it clear what is expected. Acid etching is an alternative method of exposing This is usually achieved by nominating specific the aggregate that is generally limited to precast elements. items (type of finish, colour, etc) directly, and the general The coarse texture of tooled surfaces provides colour via matters (tolerances, etc) by reference to other documents (e.g. the exposed coarse aggregate and a surface that is less likely to standards). be affected by staining from atmospheric contamination and Once a mutual understanding of what is expected has weathering. been established, the assessment of what has been provided is relatively straightforward.n Joints The location and method by which joints (expansion, control More information from the author, or construction) are incorporated into the concrete structure/ E-mail: [email protected] / www.ppc.co.za. element can have a significant influence on the final appearance. Photographs courtesy of Daniel van der Merwe 6 CONCRETE TRENDS August 2013 Always optimising energy consumption. Polysius A division of ThyssenKrupp Engineering (Pty) Ltd 71 Nanyuki Road, Sunninghill 2191 / Republic of South Africa Tel: +27 (0) 11 236-1218. Fax : +27 (0) 11 236-1301 e-mail: [email protected] www.polysius.co.za technical New cement cleans and enables 100% recycling of spent motor oils By Dr. Eng. Jean Bosco Kazirukanyo, The Advanced Cement Institute (ACTP) An entirely new cement, recently developed and soon to be Moreover, concretes containing these oils develop strengths patented by the ACTP will absorb and clean hydrocarbons similar to normal concrete and also have other benefits. They: such as new or used motor oils, diesel, petrol fuels and • Reduce the water content and replace, partially kerosene. Lubricants include engine/motor and transmission or totally, expensive concrete plasticisers or oils, hydraulic, metal-working, insulating and process greases superplasticisers and fluids. • Reduce the total porosity of concrete and its Spent motor oils contain toxic substances like lead, zinc, permeability to oxygen arsenic and carcinogenic polycyclic aromatic hydrocarbons. • Increase the concrete slump by 15%-30% if and Despite extensive campaigns to encourage safe disposal of where required used engine oil, less than 45% is collected worldwide. The • Entrain about 25%-50% air and replace air- remaining 55% is discarded in ways that adversely affect entraining agents the environment. In the USA, a leader in environmental • Produce light-weight or cellular concrete for light- protection, spilled motor oil amounts to 180 million litres per weight construction and heat and sound insulation annum. About 40% is improperly or illegally disposed of, going of residential and commercial buildings ultimately to rivers and seas, polluting waterways, agricultural The advantages of the new cement include being cost- soils and groundwater. effective and easy to use. It is also a cleaning agent, instantly One litre of used oil can contaminate 1 million litres of fresh absorbing oils and fuels, is safe to humans and the environment. water, with disastrous effects on the ecosystem. Spent engine It is a powder, is non-combustible and resists temperatures as oil is toxic to aquatic fauna and flora, and its film can impair high as 1200°C. No mud is formed during cleaning and it can oxygen replenishment and photosynthesis. It can also pollute be stored for up to 12 months. soil and drinking water and, if it reaches sewage treatment In short, the new cement developed by ACTP offers a plants, even small amounts (as little as 50 parts per million), can reliable, safe and 100% recovery and irreversible containment foul the water treatment process. Contaminated agricultural of various oils, fuels and other hazardous organic products, soils become less productive, and oil build-up can persist for provided it is further reused in concrete manufacture. many years. Specialised services will collect and deliver the used In developing countries on the African continent cement to local concrete manufacturers. This operation is (including South Africa) there is no pollution data published in the planning stage and will include subcontractors where on spent engine oil. However, it is expected that the problem is necessary. qualitatively much more serious than in the USA. A comprehensive testing programme is currently being A long-term solution was urgently required; hence ACTP’s undertaken, in line with the requirements of the South African development of the new cement. Patent Office. This includes tests on concrete containing the This new cement aims to assist oil and fuel manufacturers chemisorbed oil. and users; automotive and locomotive workshops; energy and Many South African companies have shown great interest environmental management and service providers dispose of in the product which could be on the local market as soon these pollutants in an environmentally friendlier manner. as next year. ACTP has also developed many other products The new cement chemisorbs (absorbs irreversibly) various offering long-term solutions to crucial environmental problems. types of oils and fuels. Once it has absorbed and cleaned up fresh or spent engine oils, the new cement can be reused More Information from The Advanced Cement Institute, in concrete manufacture to ensure 100% and irreversible E-mail: [email protected] containment of the pollutants. www.thecementinstitute.co.za A number of scientific publications have shown that, in hardened concrete, the engine or motor oil chemisorbed by the new cement does not leach out to pollute waterways, soils and underground waters as do the oil-cleaning and absorbing products currently used. 8 CONCRETE TRENDS August 2013 Demonstrating the effectiveness of the new cement Step 1: Materials to be used Step 2: Tile with used and Step 3: Stopping diesel oils Step 4: Sprinkling spilled for the demonstration. fresh diesel oil spilled on it. from spreading with the diesel oils with more cement. new type of cement. Step 5: Instant transfor Step 6: Removing the Step 7: Collected cement Step 8: Tile clean as it was mation of the oils into dry cement lumps with lumps for further usage and before the used and fresh tiny, dry cement lumps. a simple brush. containment in concrete. oils were spilled on it. {@@®®@®®@@) CO RESTRUCK Corestruc are the industry leaders in South Africa at providing more cost effective design and construction methods in shorter time schedules. Corestruc's main business is the design and construction of precast concrete structures in South Africa and Neighboring Countries for reservoirs, office blocks, industrial warehouses, shopping centre's etc. Tel 082 6777 469 I 487 or 0784563166 E-mail [email protected] Fax 6 62 24285 w .core truc.co.za technical Dr Chota Motala interchange lands top SAICE award he Dr Chota Motala Interchange, Pietermaritzburg’s recently completed first multi-level flyover, which is Talready a winner with motorists and commuters, has won again: it has bagged a top civil engineering award. The South African Institution of Civil Engineering (SAICE) Pietermaritzburg Branch chose the intersection, which was reconstructed to eliminate stressful traffic jams, for an award in the Technical Excellence category. The new flyover bridge over the N3 has made life much easier for motorists coming from the northern parts of the KwaZulu-Natal capital city with three lanes each way. An additional exclusive right-turn lane on the outbound side, allowing access to the N3 Durban-bound, has further eased the congestion. The work entailed: • Demolition and reconstruction of the existing four-lane bridge over the N3 due to its limitations for clearance, traffic volumes and load capacity; • Construction of a new continuously reinforced concrete five-span bridge across an adjacent feeder road; • About 19 000 m3 of continuously reinforced concrete pavement overlay; • Construction of major earth retaining walls; • Construction of pedestrian facilities along Chota Motala Road; • Construction of median barrier walls on the N3; • Construction and lengthening of ancillary drainage structures, and the relocation of services; Before construction work commenced, motorists using the • Raising the Retief Street rail bridge by 800 mm over the N3 off-ramp onto Dr Chota Motala Road had to endure traffic N3 to achieve the required vertical clearances under the backed up for kilometres. This lane has been widened to allow bridge. traffic to flow smoothly. Logashri Sewnarain, regional manager for SANRAL’s Motorists wanting to join the N3 north now use Eastern Region Office, said that, in keeping with SANRAL’s the flyover bridge without having to turn right. This has commitment to employ labour-based methods wherever eliminated a stop that previously caused peak-hour traffic feasible, the concrete pavement was constructed utilising back-ups. labour-intensive methods. The long-awaited improvement dates back six years “In all, 62 workers, a foreman and two site engineers were to when South African National Roads Agency SOC Ltd deployed on the concrete paving works alone. (SANRAL) identified the Dr Chota Motala interchange as one “Both men and women were involved with, for example, a requiring an upgrade to deal with greatly increased traffic woman operating the vibrating screed rollers that compacted volumes going through Pietermaritzburg. the concrete. “Women were also employed for traffic SANRAL and the Mzunduzi Municipality appointed accommodation and finishing works while men mainly handled the Iliso/Aurecon Joint Venture for the detailed design heavier-duty functions such as concrete placing.” of the upgraded interchange and associated roadworks. She said various training providers were engaged for the Aurecon was responsible for the design of all bridge work. pavement layers and bridge construction with training ranging Construction work was carried out by Group Five Joint from basic use of power tools, skills development for construction Venture in consortium with Phambili. operations, safety awareness training and life skills training. (continued on page 12) 10 CONCRETE TRENDS August 2013 A world leader in building materials and a top-ranking player in the cement, aggregates and concrete industries, we contribute to the construction of cities around the world. Our innovative solutions are helping to provide more housing and to make cities more compact, more durable, more beautiful and better connected. The Group employs 65,000 people in 64 countries, and posted sales of 15.8 billion Euros in 2012. In South Africa, the company manufactures and supplies cement, aggregates, readymixed concrete, gypsum plasterboard and interior building fittings. Lafarge South Africa • Tel: 011 657 0000 • Fax: 086 631 0006 • www.lafarge.co.za technical The main determining factor in the design for the bridge In the technical excellence category of the competition, was the requirement that any new bridge over the N3 had to the project should have unique or unusual features and be constructed without disrupting or endangering the heavy should demonstrate some notable advance in the solution traffic on the freeway. of engineering problems; it should have particular aesthetic “It was for this reason that the incrementally launched appeal; it should display engineering ingenuity in analysis bridge building method was used which involved construction or design and/or in construction technique; and the project of the bridge superstructure section by section and then should show functional efficiency. launching them sequentially into their final position. Also, the handling of impacts on the environment should “The bridge has also achieved exceptional aesthetics. The be particularly successful and the project should have been project team took a decision that the webs and bottom slab well managed, finished within time constraints and also within of the bridge be more rounded than usual, and that aesthetic budget. lighting as well as golf-tee-shaped piers be made part of the The Dr Chota Motala bridge was judged to meet all these bridge structure. criteria.n “The result is a bridge which is as elegant as it is structurally sound,” said Sewnarain. More information from Jody Boshoff , SAICE awards are given to promote the art and science Tel: +27(0)12 427 2066 / www.aurecongroup.com of civil engineering. Fulton Awards recognition for Dr Chota Motala bridge The Fulton Awards, presented by the Concrete Society of the aesthetics of the bridge and considered many aspects Southern Africa every two years, honour excellence and such as slenderness, span lengths, pier diameter, shapes innovation in concrete construction and top-achieving of members, shadow and lighting. The result is an elegant engineering design. and aesthetically pleasing civil engineering structure that This year, the Dr Chota Motala Incremental Launch showcases concrete in an excellent manner”. Bridge in Pietermaritzburg, South Africa, for which “We believe our objective of providing the client Aurecon played the role of design engineer, was awarded with exceptional value for their investment has been a coveted ‘Commendation’ in the ‘Civil Engineering achieved”, comments Aurecon project manager Hennie Projects’ category. Niehaus. “This achievement is confirmation of Aurecon’s The judges found the bridge fully deserving of a in-depth experience of designing fit-for-purpose bridge- ‘Commendation’ for its clever use of concrete to achieve related structures. Congratulations to both the bridge low costs, meet the need for ultimate safety during and broader project team on their dedication and a job construction and ensure low maintenance costs during well done.” the life of the bridge. The judges also commended Aurecon for superior input in terms of design, More information from CSSA, commenting: “Of special note was that the engineers, in +27(0)12 348 5305 / www.concretesociety.co.za the absence of an architect, paid particular attention to 12 CONCRETE TRENDS August 2013 The Concrete Institute discusses the six main reasons why floors fail oncrete floors on the ground account for the majority of problems dealt with by the technical Cstaff at The Concrete Institute, says Bryan Perrie, MD of the Institute. Perrie says the problems encountered can be categorised into surface defects, joint defects and structural defects. W ithin each of these ca tegories there are numerous different defects. An analysis to determin e why th ey occur resulted in the identification of six primary reasons for the occurrence of these defects. They include: Design by structural engineers Concrete floors on the ground are effectively concrete pavements and should be designed, detailed and constructed as such by pavement engineers. Th e use of structural concepts such as the use of reinforcement to increase load -carrying Bryan Perrie, MD of The Concrete Institute. capaci ty and reinforcement through construction joints results in unacceptable cracking and in some cases overstressing ground. "Often engin eers are not aware that there are design of the floor and structural failure. Often there is a lack of guides and software available for the design of concrete floors understanding of restrained drying shrinkage in floors on the on the ground," Perrie states. (continued overleaf) The widest range of retaining wall blocks for both high and low walls. Tel: 0861266267 TECHNICRETE www.technicrete.co.za quality support technical Inadequate detailing and/or specifications specifications such as SANS 1200 G or SANS 2001 CC1 are Joint detailing, location and layout are all critical factors in the used but these documents do not cover specific requirements behaviour of concrete floors on the ground. There is a tendency for floors on the ground. to mix and match joint types and details from different design Perrie says often the use of outdated tolerance specifications technologies which often results in poor joint performance and - such as those using straight-edge measurements - can result also joint failure. in not achieving the appropriate tolerances required by the client. The best specification for tolerances is contained in the British Concrete Society’s Technical Report No 34 (TR34). This often results in the need for special equipment or a specialised contractor to measure the floor to ensure compliance with the specification. Split responsibility on site Typical issues here include: • The earthwork contractor’s tolerances not being compatible with those for the concrete floor; • The main contractor supplying to, or purchasing inap- propriate concrete for, a flooring subcontractor; and • The flooring subcontractor being only responsible for placing and finishing the concrete, but not responsi- ble for installation of shutters, joint cutting or curing. “An example of this is to use reinforcement in floor panels Lack of skills or knowledge to control cracking when panel sizes larger than around A lack of skills or knowledge can be on the part of the client in 4 m are used - but then still using sawn contraction joints or not knowing what he wants, the engineer in not understand- keyed construction joints which are not capable of providing ing the requirements of the client and being able to design and adequate load transfer due to the larger than normal opening specify accordingly, the main contractor in not understanding of the joints.” the risks for the subcontractor in working under certain condi- tions, main contractors doing specialised flooring contractors’ work and subcontractors not understanding joint and tolerance details. “To ensure a good floor needs all the above parties to be involved at all stages of the project and to have open communi- cations,” he advises. Inadequate knowledge of materials and their behaviour “There is a distinct lack of knowledge among all parties regard- ing concrete materials and their effect on both plastic and hard- ened concrete. This includes the effect of cement type, water content, cement-water ratio on the behaviour in concrete and specifically on concrete floors which may be largely un- reinforced and have a very large surface-area-to-volume ratio. These all affect the rate of moisture loss, drying and therefore the risk of cracking,” Perrie observes. To date there is no standard specification which deals with Inadequate appreciation of construction techniques floors on the ground. There is however an SANS Standard for The need for adequate compaction and the effect of different the design, detailing and surface finishes, namely SANS 10109 types of equipment on compaction, the use of incorrect termi- Parts 1 and 2 as well as a book entitled Concrete Industrial nology with respect to power floating and power trowelling, and Floors on the Ground available from The Concrete Institute. the effect of different equipment of the finish obtained, are all These documents provide guidance on the detailing and due to a lack of appreciation of different construction techniques. specifying of floors on the ground. Often the standard structural “By far the biggest lack of appreciation is with respect to the need 14 CONCRETE TRENDS August 2013 for adequate protection and curing of floors on t he ground. This protection should start as soon as the concrete is discharged and should continue until t he required finish is achieved after which effective curing measures should be implemented." Master Builders South Africa's CONGRESS is a Perrie says addressing some of the above issues will resu lt in significant highlight on the building industry's calendar better quality floors with fewer defects. where the industry meets to discuss issues and challenges To assist the industry, The Concrete Institute runs a one-day affecting our industry. Congress creates a platform where solutions can be found with the innovative ideas from t raining course on the design and construction of industrial floors at guest speakers, in addition to it being an occasion for the which all of the above issues are covered. It also offers the publica industry to network with potential business partners, t ion mentioned previously for sale. • friends and colleagues from around the country. Confirmed Speakers Plenary and Breakaway Sessions More information from The Concrete Institute, • Min Malusi Gigaba Discussions include: Tel: +27(0)11 315 0300 • Adv. Thuli Madonsela • Keynote Address by the Minister Email: [email protected] I • Mr Roelf Meyer of Public Enterprises www. theconcreteinstitute. org. za • Mr Trueman Goba • The Public Protector, • Prof Tin us Maritz Republic of SA • Mr Gavin Taylor • National Planning Commission • Mr Justice Malala update • Mr Phumudzo Maphaha • Enterprise development • Health and Safety Standalone concrete repair • Innovation and skills to meet infrastructure development division established demands In response to a significantly increased demand for THE BUILDING INDUSTRY is a significant contributor to the South African economy specialised concrete repair work, Concor Civils, part of and plays a vital part in the roll out in the R860 billion the Murray & Roberts Construction Group, has introduced infrastructure programme. a dedicated concrete repair division as a standalone Emphasis will be placed on the role of the SOEs, innovation, offering trading as Murray & Roberts Concrete Repair. The enterprise and skills development. lhe event will also focus new division is headed up by Pherdy le Roux, under the on Africa infrastructure opportunities. guidance of Joe Rader, an expert in the f ield of innovative Who should attend? use of concrete. • Industry Leaders • Youth "Specialised concrete repa ir work has always been part • Built Environment Professionals • Member Associations of our civils' service offering," Anton Botha, managing • Academia and Analysts • Industry Related Sectors director of Concor Civils, says. " However, in recent times our concrete repair workload has increased dramatically The 2013 Master Builders Congress and it made strategic sense to create an independent team INDABA Hotel Johannesburg of professionals focused so lely on this critical area of work. 29 September to 1 October 2013 "Working underthebannerof Concor Civils, the concrete Register online at www.mbsacongress.co.za repair division offers a high level of skills, complemented by a depth of technical and application knowledge. Its and more ••• capabilities are underpinned by access to the Murray & Earn CPO Points Join the Social Play Golf at Roberts Concrete Centre of Excellence. "The market is SACPCMP: Events and BLAIR ATHOLL seeking sustainable solutions to concrete and civils work, 5 points/day Gala Dinner essentially a single-source contractor. The concrete repa ir division w ill, therefore, also provide valuable assistance MAIN SPONSORS s:-s:-c::: 1 1 4 to cl ients involved in small civil works, where a reputable 33¢, 3: • contractor is required to undertake this work and where Sponsorship & Exhibition opportunities are having the necessary skills and applications knowledge is available in the exhibition FEM essential," concluded Botha.• area to network and meet ----- delegates during the More information from Stephanie Swanepoel, refreshment breaks. ~ Bartoworld P!!!"' ~ Equipment _.... Tel: +27(0)11 590 58331 www.murrob.com For further details on bookings contact Estelle Lotter at Ripcord Promotions E-mail: [email protected] OR Tel:t2711482 2835 OR +27112059000 technical Top 10 tips for choosing a concrete flooring contractor lients, developers and contractors are often presented 4. Don’t compromise on quality: Demand a well-struc- with a choice of flooring contractors for their new tured QC procedure, an organised programme of works, Cwarehouse developments. Comparisons are not experienced site management and a skilled, qualified always straightforward and decisions based on price alone and motivated workforce. Quality deficiencies cannot could result in long-term issues for the warehouse operator. be eradicated and costly compromises are often the only solution. 1. Think long term: Purely cost-driven tendering and 5. Check the detail ….. are you comparing like for procurement is often reflected in performance and like? Common mistakes include: durability; short-term financial benefits can become long- • Comparing labour/plant against full supply package term headaches. Invest in your floor for your current and • Comparing traditional saw-cut slabs against a future needs. ‘jointless’ SFRC slab 2. Reduce your risk: A specialist flooring contractor will • Assuming slab thickness is too thin or thick without take responsibility for the flooring package from design substantiation through production and provide on-going assurance • Not considering the pay-back period of investment with appropriate insurance guarantees. 6. Promises are no substitute for experience: Special- 3. Beware cheap imitations: Ensure you are getting ist contractors will demonstrate a quantifiable track re- quality materials suitable and proven for the floor slab: cord spanning all areas of the business. • Concrete – who is providing, co-ordinating, 7. Scrutinise labour skill credentials: A cheap price controlling mix design and delivery to site? could mean unskilled labour. A specialist contractor will • Reinforcement – from a reputable supplier supported have directly employed skilled labour specialising in use of by independent tests and proven track record? specific equipment, production processes and possess all • Superplasticiser – quality controlled on site? the appropriate OHSA certifications. Dryshake topping – correctly specified, appropriate • 8. Embrace value engineering: The influence of special- dosage and timely application? ist contractors during the design and specification stages A specialist contractor should demonstrate complete of a scheme can be of great value to all parties. As an understanding of and capability to control the integrated and detailed part of the planning process it production process, including design and production considers techniques and materials that could provide of the concrete. better performance and value over the life of the project. Reputable contractors know the importance of good- 9. Remedial grinding is not the answer: Engage a quality concrete at all stages of floor production and specialist contractor who is able to lay the floor to the will always use the optimal concrete. Cutting costs required tolerance first time – eliminating the need for by using poor-quality concrete mixes not complying time-consuming, expensive remedial grinding. Specify with international design guidelines may produce an the right flatness for your needs. acceptable short-term result, but will be reflected in mid-term operation. 10. Consider all facets of the company: A specialist con- tractor will demonstrate skilled production staff, experi- enced designers, managers and support staff, coupled with strong supply chain relationships and financial security.n More information from Twintec, Tel: +27 (0)21 914 7752 / www.twintec.co.za Massbuild DC in Midrand: floor completed by Twintec Ltd. You see us everyday without recognizing us • I I These projects are strong and beautiful, because they use construction materials and specialty construction admixtures developed by Grace Construction Products. One of the largest construction materials suppliers in the world , Grace Construction Products has been serving the needs of the international construction industry for more than 70 years. With presence in South Africa, and an infrastructure of technical laboratories, plants and sales personnel, the company provides high quality & customer-focused products, and world class technical service and support at local level. If you want to know more about us, go to www.graceconstruction.com • Additives for Cement Processing Concrete Admixtures and Fibres Products for Architectural Concrete, (Pieri~ Products for Light and Heavy Precast Concrete Waterproofing Systems Fire Protection Products Specialty Mortar Systems (BETEC®) precast concrete Zambian roads to be upgraded with concrete block paving he Concrete Manufacturing Association (CMA) has Moreover, Lafarge Cement Zambia Plc is conducting training revealed that the Zambian government has embarked using experts from South Africa and France. Ton a roads rehabilitation and infrastructure improvement One of these is former CMA director and independent programme, part of which entails Pave Zambia, the upgrading paving consultant, John Cairns. in December last year, as a of some 2 000 km of gravel roads using concrete block paving guest of Lafarge Cement, he gave a one-day seminar in Lusaka (CBP). In addition, 90 km of pavements and paths will be on all aspects of CBP for government officials, engineers and surfaced with CBP. potential paving contractors. The government views the construction of roads, especially The Zambian government has also imported CBP concrete roads, as a means of boosting the economy using production machinery from China which is being sold or leased locally-sourced materials, and as a vehicle which addresses the to independent manufacturers. The cement for the project will country’s high unemployment levels. be supplied by Lafarge Cement and aggregates will be sourced Pave Zambia is being financed by the Zambian Road locally in each province. Development Agency and the initial phase, which focuses on The Zambian construction industry grew by 15,3% between inner-city and urban roads as opposed to inter-city roads, kicks 2000 and 2010 and its annual growth forecast over the next off during the second half of 2013. two years is 12%.n The government plans to make each of its 10 provinces self- sufficient in road construction, both in terms of equipment and More information from CMA construction capability, and Zambia’s National Construction Tel: +27(0)11 805 6742, Taco Voogt, +27(0)83 647 0724 or Council (NCC) has introduced a training programme to Wally Armstrong +27(0)83 701 3278 train SME operators on how to build urban roads using CBP. precast concrete Exciting new paving finishes soon available Bosun’s new factory under construction. osun, manufacturer of concrete paving products and renowned for their innovative solutions like the be available in an ultra-smooth polished option in various BLarge and XXL Urban pavers, will soon introduce a thicknesses. Certain kerb shapes will be produced in an completely new range of beneficiated paving units. exposed finish to cater for aesthetically pleasing road edging Construction of a new custom-built facility in Midrand, to match or contrast with driveways, walkways or commercial adjacent to their other factories, commenced at the beginning road surfaces. of 2013. The new Press Technology manufacturing plant and Another exciting development is that Bosun’s range of large beneficiating line has arrived from Germany and plant is now pavers, some of which are up to 27 times the size of standard fully operational. paving bricks, will now also be available in a calibrated option. According to David Wertheim Aymes, CEO of the Bosun Calibrating is the process of diamond cutting the product to Group, this new equipment will produce paving finishes exact thicknesses. This will ensure total dimensional accuracy, such as exposed aggregate, ground concrete and shot-blast will make product installation much quicker and easier and concrete. Apart from this, most of the finishes will also be yield an aesthetically pleasing and flat surface. offered on selected interlocking pavers, in order to create “As we say on our logo, our customers should expect the unique textures that can be integrated from parking areas and best from Bosun, and our promise is to meet our customers’ roadways into walkways and boulevards. expectations,” Wertheim Aymes concluded.n The new Press Technology plant will however produce pavers with a unique, smooth topping layer, which could also More information from Carol Chapman, be finished in the same way as the Urban and interlocking Tel: +27(0)11 310 1176 / www.bosungroup.co.za pavers described above. The Press Technology range will also precast concrete Doing it yourself in British Columbia rinceton, a small town located in the Similkameen area of British Columbia, midway between Vancouver and Pthe Okanagan Valley, is home to a few sawmills, copper mines and a centre for ranching. Sheltered by the Cascade mountain range in the west and by the Rocky Mountains in the east, Princeton enjoys a healthy climate, dry with temperature extremes that can range from -41°C in December and a sweltering +41°C in July. Mining activities in the area are currently focused mainly on copper and great care is taken to make the scars as unobtrusive as possible. Wayne Crimmon, who lives on a rural property outside Princeton, runs Bio-Ag Technologies Inc, a company that specialises in the rehabilitation of mining sites by establishing plant growth on the mine dumps. Crimmon’s machines are equipped to travel up and down on very steep slopes in order to spread the fertiliser. Seeds mixed with chopped wood chips and composted residue from sewerage treatment plants in the lower mainland and Vancouver, are spread evenly over these slopes. Results are spectacular, especially once indigenous trees start to grow and the mine dumps start to look like most low mountains in the area. Crimmon was challenged to establish a matching garden for his brand new home that boasts a view that dreams are made of. His Internet research for versatile landscape blocks that are available in British Columbia led him to Fred and Chuck of Blocksrus in Williams Lake. They make a range of Terraforce blocks that impressed Crimmon and he decided to go with the smallest of the range, the Terralite block, complemented with the 4 x 4 Step block. For installing undulating landscaping measures, such as he had in mind, the Terraforce blocks are unmatched in versatility. In addition it was important that Crimmon and his family would be able to undertake the installation themselves. It is said that a picture is worth a thousand words, and these photographs clearly illustrate that the challenge was met head on, as intended.n More information from Terraforce, Tel: +27(0)21 465 1907 / www.terraforce.com 20 CONCRETE TRENDS August 2013 ~FARGE SAVING RHINOS WITH BUILDCRETE • Lafarge South Afica has pledged ongoing support for the world's fi rst dedicated Rhino Orpha nage, which is caring for baby rhinos that are parentless as a result of South Africa's devastating poaching epidemic. • You can help by purchasing a bag of Buildcrete cement! A percentage of every bag purchased will be donated to the Orphanage. • South Africa is home to over 90% of the world's population of rhinos and we are proud to be playing a meaningful role in helping to preserve its unique heritage. www. therhinoorphanage.co. za lafarge South Africa • Tel: 011 657 0000 • Fax: 086 631 0006 • www.lafarge.co.za precast concrete Now it’s concrete cabins for photovoltaic farms outh Africa is facing severe energy shortages and the African countries,” said David Merino, senior civil engineer development and utilisation of renewable energy has and technical manager at Prephor. “So it made economic and Sbecome paramount. The development of Photovoltaic market sense to enter the South African arena with Rocla who (PV) farms in South Africa, while still in its infancy, has positive have nearly 100 years of precast concrete experience. We implications for the tourism, commercial and residential believe that the development of PV farms is but one outlet sectors as well as for those communities not ‘on the grid’. for the concrete cabins, which are also suitable for a variety of Together with these PV farm developments comes the need to other industrial applications in South Africa”. house the associated instrumentation in a practical, secure and In general, one cabin, at almost 9 m long x 2,6 m wide x environmentally friendly way. 3,1 m high and weighing under 30 tons, is required for every Rocla, South Africa’s precast concrete specialists, have megawatt of power generated on site. entered into a manufacturing-under-licence agreement with The concrete cabins not only offer durability and safety, Spanish company Prephor, the European market leaders for they are constructed so that the natural ventilation required supplying concrete cabins to PV farms. They aligned with for the instrumentation – inverters, switchgear and also Rocla because of the company’s extensive experience in this transformers – flows through adequately. To ensure safe very niche concrete industry segment. transportation of the cabins to site, Rocla commissioned Justin Kretzmar, Rocla sales engineer said, “We are specially designed heavy-load flat-bed haulers. delighted to have formed this partnership with Prephor, as Cabins are offered in varying lengths, with width and we believe it’s a meeting of ‘experienced minds’ that will height as fixed dimensions. In addition, all openings for doors, mutually benefit both companies. The moulds for the concrete ventilation grilles and fans are customisable to suit the needs cabins, manufactured in Serbia by an Italian company, arrived of specific clients. at our Roodepoort factory in June, packaged in five open-top The end-client for these cabins would be the owner of the containers. Rocla plans to manufacture one cabin per day, with PV farms and the primary attraction is the fact that once the the first cabin delivered in mid-July. We currently have orders cabin is delivered to site, they have a ‘plug-and-play’ unit that has for 128 cabins. been completely manufactured, with all the internal electronics “To accommodate this unique new product, we have installed, tested and certified, in a secure factory environment. This completely renovated an existing production area at our eliminates the chance of expensive cable, inverters, transformers Roodepoort Factory so we can produce, de-mould, cure, fit and switchgears being vandalised on site. and paint each cabin in one area, without having to move Rocla believes the cabins would be suitable for elec- them unnecessarily. In addition, we brought in an extra 25-ton tricity sub-stations, telecommunications installations and any gantry crane to increase our lifting capacity from 25 to 50 t industry where sophisticated instrumentation needs to be and custom designed and manufactured a specialised tilting securely housed.n device and lifting beam,” commented Kretzmar. “We have an enormous amount of experience within the More information from Malebusa Sebatane, European PV farm market but none in South Africa and other Tel: +27(0)11 674 6957 / www.rocla.co.za The Rocla concrete cabin during manufacture. Completed cabins awaiting installation. 22 CONCRETE TRENDS August 2013 Concrete was there ... New and independent, The Concrete Institute, created for concrete and related industries, incorporating the original School of Concrete Technology, the Information Centre and Technical Advisory services. www.theconcreteinstitute.org.za ~ CONCRETE INSTITUTE precast concrete Precast concrete poles replace vandalised steel poles he Ekurhuleni Metropolitan Municipality has opted to Pole replacement began in June 2012 and Phase 1 was replace vandal-prone steel street-lighting poles with completed in June 2013. Steel poles which have not been Tprestressed I-shaped concrete poles in several of its damaged are being replanted in the suburbs where the municipal districts. One of the country’s leading precast incidence of pole vandalism hardly exists. concrete manufacturers, Aveng Manufacturing Infraset, won Aveng Manufacturing Infraset’s product manager, the tender to supply 800 concrete poles for the first phase of Mothemane Makhura, says two lengths of concrete poles, the project, which is based in Springs. 10 and 11 metres, both rated at 8 kN, were supplied for the According to Richard Baloyi, a support services engineer project. at the Ekurhuleni Metropolitan Municipality, steel poles are an Baloyi comments that concrete poles were specified, easy target for vandals. “They are being cut down on our more because unlike steel poles, which are relatively easy to hack remote and sparsely populated roads, especially on the Springs/ down, they are virtually vandal-free. “Moreover, concrete poles Brakpan, Springs/Nigel and Springs/Duduza routes, and this is are rust-free and have much longer life spans.” where Phase 1 of the replacement project has unfolded.” Commenting further, Baloyi says that it’s not the poles themselves that the vandals are after but the copper content in the light fittings, which is sold for scrap. “We are also replacing the underground copper cabling with overhead aluminium bundling which means that our street lighting will be far less vulnerable to theft. The Ekurhuleni Metropolitan Municipality regards street lighting as indispensable in the fight against crime and this is why we are treating this project as a matter of urgency.” The design and project management work for the project is being handled by Secret Steps Trading and the actual installation work is being done by several sub-contractors, each employing between 10 and 20 people. The concrete poles are being planted in manually-dug holes approximately 1,2 m deep in strict compliance with Health and A vandalised steel street-lighting pole on the Springs/Nigel road. Safety regulations. Makhura says I-shape poles are ideal for this type of installation and they make the mounting of street lighting both easy and secure. “The high strength-to-weight ratio of the I-shaped poles puts them in a class of their own. Moreover, the poles for the Springs project were manufactured with earthing bars to protect them against lightning. Their excellent weight-to- strength ratios and their reduced weight made them easy to offload and handle. “The poles for this project were cast at our Brakpan factory in high-strength, high-density concrete with a smooth finish. The resilience of prestressed concrete poles enables them to recover from the effects of a greater degree of overload than any other type of structural material. It has been demonstrated worldwide that the prestressed concrete poles are maintenance free for life.”n Wit Road in Springs, where prestressed concrete poles have More information from Mothemane Makhura, replaced vandal-prone steel poles. Tel:+27 (0)11 813 2340 / www.avengman.com/infraset 24 CONCRETE TRENDS August 2013 CBP used in Shovagakula Paving Project recast concrete block pavers (CBP) and kerbing have been used to construct safe, attractive and durable pavements in Olievenhoutbosch Ext 36, for both Ppedestrians and cyclists. Known as the City of Tshwane's Shovagakula (Easy) Paving Project, it is being run over three years in several phases and aims to encourage the use of bicycles in the place of cars for travel within Olievenhoutbosch. Phase 1, which was begun in April and completed by the middle of June, involved the construction of pavements 2,2 m w ide 1 600,m long using 50-mm bevelled pavers as well as Figure 1 0 and 12 concrete kerbing supplied by Concrete Manufacturers Association (CMA), member MVA Bricks. Construction involved compacting in-situ material to 90-93%, adding and compacting a 150-mm layer of G5 mixed w ith four percent of cement, and topping that with 20 mm of river sand. Once the pavers were laid, they were covered with plaster sand to fill the joints between the pavers. The surface was then swept and compacted to form a very attractive and hard-wearing surface. The terracotta-coloured pavements were edged w ith a header course of charcoal pavers which were also used for decoration strips at every five metres. The main contractor on Phase 1 was MK Brick and Earthworks, owned and run by Nathaniel Kgobe. Kgobe says that 35 people were deployed for the execution of Phase 1, 28 of whom were unskilled members of the local community. "We trained them in all aspects of CBP surfacing including the preparation of the sub-base, the actual laying of pavers and the installation of kerbing. and they have acquired skills which they can use on other projects of this nature," said Kgobe.• More information from CMA, Tel: +27(0)11 805 6742, Taco Voogt, +27(0)83 647 0724 or ~ 1 768 Co~rete buffj~;~g an,d Wally Armstrong +27(0)83 701 3278 poliShing rn)chiOe - 2'20V 175RPM R14 ooo.oo ea Various in situ terrazzo mixes and terrazzo polished and textured tiles available. For tile selection view www.uniontiles.co.za A UNION VTILES 19 North Reef Rood r>edfordview.... 2007 Tel: +271 1663 2000 Email: [email protected] Website: www.diastar.co.za Pricu vahd until 30th Sepl¢mb¢r 20 13 whll¢ stocks lost August 2013 CONCRETE TRENDS 25 rs ond C's opply. precast concrete Mandela Barlow Street transformed hen Jerry Shivambe of Capstone Trading cc won the surrounding communities. In addition to remuneration, the contract to pave Mandela Barlow Street in the company is providing skills upliftment and training to WLimpopo, he chose Technicrete’s Double Zig-Zag the workforce, which constitutes 50% women – a group Interlocking pavers and kerbs. Acting on behalf of the Greater that is often overlooked. This will equip the community with Lethaba Municipality, Shivambe is undertaking an ambitious transferrable skills that will be of future benefit to all. paving project in the Modjadji Satellite Municipality. This will By early May 6 000 m2 of the Interlocks as well as 600 m see the transformation of Mandela Barlow Street – three of kerbs had been delivered to the site. Technicrete’s Mishack kilometres of unpaved gravel roadway in the Kgapane rural Mdhluli has liaised closely with Jerry Shivambe and has worked area – into a neat, attractive and durable street capable of hard to ensure that supplies of pavers and kerbs have never carrying heavy loads. delayed the progress of the project. The Modjadji Municipality lies within the realm of and is Shivambe elaborates: “I very much appreciate the way named for the legendary Rain Queen of the Balobedu people. Mishack has helped me. He has really made sure that deliveries The Rain Queen is believed to have special powers, including are always on time and enhances my reputation with the the ability to control the clouds and rainfall and, unusually for municipality thereby improving my chances of winning more Africa, succession to the throne is matrilineal. contracts.” When the three kilometres of paving has been completed, To establish Technicrete as the supplier of choice for rural Technicrete will have supplied and delivered 15 400 m2 of development projects in the region, Mdhluli keeps in close 80-mm-thick Double Zig-Zag Interlocks and 2 800 kerbs from contact with all contractors who have been awarded municipal their Olifantsfontein factory to the Kgapane site. The Double tenders. Technicrete’s reputation for excellent customer service Zig-Zag interlocks have an established reputation of creating helps ensure that they are top of mind when the choice of durable and hard-wearing surfaces that are ideal for heavy- supplier is made. duty applications such as roadways and a wide variety of Work on Mandela Barlow Street started in April 2013 and commercial and industrial facilities. The kerbs serve not only was completed by the end of June.n as edge restraints, but also divert rain-water from the roadway into the drains that are inserted every 900 metres. More information from Malebusa Sebatane, In a move calculated to involve the community, Capstone Tel: +27(0)11 674 6957 / www.technicrete.co.za Paving is, as far as possible, drawing its labour force from 26 CONCRETE TRENDS August 2013 Awards honour Women in Construction f there was ever an appropriate company to sponsor and present the Women in Construction Excellence Awards Iat the TotallyConcrete Expo in June, it was the Motheo Construction Group. Established in 1997 by Dr Thandi Ndlovu, Motheo has, developed into one of South Africa's leading, predominantly black female-owned construction companies, w ith six black female shareholders who hold over 50% of the company's shares. The Awards celebrate the expanded roles women play in the cement, concrete and construction industries and recognise their role in the development of the African built environment. Busi Legodi and Uz O'Leary after receiving Nominees were: Makoekie Tsotetsi, owner of lmpota their awards. Trading; Busi Legodi, general manager of PPC's Jupiter fac Busi Legodi was appointed as PPC's first black GM in tory; ltumeleng Dlamini, executive director of Master Build 2012, to oversee operations at its Jupiter plant in Germiston. ers Association South Africa, Sebasti Badenhorst, Concrete Elizabeth O'Leary, is the executive director of Khuthaza, Applications business executive at Protech Kuthele; Profes an organisation whose vision is to create an environment in sor Elsa be Kearsley from t he University of Pretoria; Elizabeth w hich women have equal access to opportunities in the hous O'Leary. executive director at Khuthaza and Michelle Wil ing and construction spheres. In 2008 she was honoured by liams, owner of Bella M Ready Mix. the Council for the Built Environment with the Renowned The Awards, presented by Lettie Ndlovu, a director of Woman Leadership and Empowerment Award. • Motheo Construction, to PPC's Jupiter GM, Busi Legodi and Elizabeth O'Leary of Khuthaza. More information at www.concrete. tv Concrete equipment to exceed your expectations Atlas Copco concrete mat erial equipment offers a solution to any composite construction material, w ith a wide range of pokers, trowels and screeds for concrete vibration, floating, trowelling, compaction and levelling of concrete surfaces. This low maintenance, durable range is easy and safe to use for extended life. www .atlascopco.co.za women in construction Talent transcends gender at Lafarge afarge, the world leader in building Group as medical director for Africa and materials, aims to have a substantial the Middle East, developing the health Lpercentage of women in senior programmes and emergency response management positions by 2020, through procedures for the region. She has also been actively promoting employment of women and appointed an executive director of Lafarge offering motivating career paths. Inspirational Industries South Africa and Lafarge Mining women making their mark at Lafarge, South Nonkqubela Noloyiso Mazwai South Africa. She says, “My mission is to Africa are: see our employees healthier than when they joined the company and the Group Nonkqubela Noloyiso Mazwai moving towards zero occupational injuries From a ‘tomboy’ in a Transkei village to and illnesses.” respected advisor and board member of many With her responsibilities now embracing South African blue chip companies and state the global Lafarge Group, she is based in entities is Nonkqubela Noloyiso Mazwai’s Seseselelo Matlapeng Paris and travels the world. She has medical journey. She is now serving her second term directors for Asia and the Americas reporting as chairperson of the Lafarge Industries and to her. Mining boards. Mazwai says that though her university Maria Sazeides degrees have helped her get ahead, it is Maria Sazeides began her cement industry ultimately her drive and ambition that have career with Cement Distributors. Armed with played the major role in her success. Mpogeng Nkgadima a BA from Wits University and a marketing diploma from Wits Business School, she Seseselelo Matlapeng joined Blue Circle as marketing administration Hailing from Polokwane in Limpopo, Seseselelo manager. (Sese) Matlapeng has a BSc Hons in Bio- At Lafarge South Africa she has headed Chemistry and joined Lafarge Gypsum four the Marketing Department and is currently years ago as a product manager. She is today the national sales and marketing manager marketing manager in the highly competitive Dr Mikateko Shisana - Cement. “In our increasingly competitive plasterboard and interior building fittings world, we must be flexible and able to change industry. direction at short notice – or be left behind,” comments Sazeides. Mpogeng Nkgadima Life took Mpogeng Nkgadima, programme Nomveliso Gwamanda manager for the Lafarge Education and Nomveliso (‘Veli’) Gwamanda joined Community Trusts, from Gamoloi village in rural Maria Sazeides Lafarge South Africa in November 2009 and Limpopo to managing a successful education is currently the Country HR director. She upliftment programme for thousands of holds a BA degree and has completed post learners from disadvantaged communities. graduate studies in Industrial Relations and A BAdmin degree, a variety of jobs and Management. extensive travel followed by an Honours In 2012, Gwamanda was appointed an degree in Administration and Development executive director on the boards of Lafarge Studies, brought Nkgadima to the Lafarge Nomveliso Gwamanda Industries South Africa and Lafarge Mining Trusts. “Making a difference and knowing South Africa. Gwamanda is also a member that I contributed is immensely motivating and of the Country EXCO team at Lafarge South makes it all so worthwhile,” Nkgadima says. Africa. Dr Mikateko Shisana Sal Govender Lafarge Group Occupational Health vice- After transforming marketing strategy at president, Dr Mikateko Shisana, joined the Sal Govender Lafarge Gypsum, Sal Govender joined Lafarge 28 CONCRETE TRENDS August 2013 women in construction South Africa in January 2013 as Readymix national Charlene Lamb marketing manager. “It is exciting to develop With the recent restructuring of Lafarge South sustainable, mutually beneficial partnerships with Africa, Charlene Lamb was appointed Country our customers and market the vital role of readymix Communications manager and a member of the in sustainable construction,” she says. Country EXCO team. She spearheaded the internal and external repositioning of the company’s brand Alta Theron Alta Theron in line with the international Group’s theme of Alta Theron loves new challenges. After finishing ‘Building better cities’. her accountancy articles, and working at Denel “Effective communication is playing a vital as Treasury accountant, Theron moved to Ash role in promoting the Lafarge brand,” she says. Resources as financial accountant, where she Accomplished in communications, marketing, achieved the Top Delegate award on a GIBS advertising and journalism, Lamb joined the company Management Development Programme. She in 2011 as communications manager for the cement became commercial manager overseeing sales, business line. Her experience is wide-ranging and logistics and marketing, and was a member of the Charlene Lamb includes working locally and in the USA.n company’s EXCO. In 2012, Theron joined Lafarge South Africa to drive the More information from Charlene Lamb company’s business expansion programme. She is also a member Tel: 011 657 0000 / [email protected] of the Country EXCO team. www.lafarge.co.za August 2013 CONCRETE TRENDS 25 Achieving women at Ash Resources t fly ash supplier, Ash Resources, women are actively Marlene Trosello encouraged to reach their full potential. The company "Keep me all day in the A recognises that diversity is a key strength and one office and I would of its sustainability ambitions is to achieve a more equitable suffocate!" declares gender balance among employees. Two Ash Resources' women Marlene Trosello, the commanding respect in traditionally male functions: first female forklift truck driver at Ash Nonqaba Theko Resources. "I love the "As a young girl growing up in Amsterdam, Mpumalanga, I outdoors and life is dreamt of becoming a pilot," explains Nonqaba Theko, quality too short to sit still manager at Ash Resources. But, with her flair for mathematics when there are so Marlene Trosel/o, the first woman forklift and science, Theko settled on a B Tech Civil Engineering degree many cha llenges truck driver at Ash Resources. at the University of Johannesburg. To waiting out there." her surprise, at her first job with Rocla, Trosello started as a receptionist at Ash Resources' Lethabo plant. she fell in love with concrete. She When the company needed to train another forklift truck driver, joined Ash Resources in January 2013. Trosello grasped the opportunity ... and achieved a first for women " It's a wonderful opportunity to build in the company. • my own department," comments Theko. " I am enjoying the mix of More information from Charlene Lamb, Nonqaba Theko, quality management, process engineering, Tel: +27(0)11 657 0000 I www.lafarge.co.za manager; Ash Resources. QC and customer service." Realising women's untapped potential he impact of women's development on the global was Nomasonto Tshehla. She joined Tiber as a junior economy is becoming clear. Research shows that engineer, and soon came to the attention of Tiber's MD, Tcompanies with more women board directors Fernando Cardoso. She was offered the opportunity to outperform companies with the smallest number by 66% specialise in Green Building and assist the company gain in return on invested capital, 53% in return on equity, and expertise in the field. It was a significant responsibility as 42% in return on sales. she had to gain the knowledge, develop the systems and It is also generally acknowledged that investment in set up the department within Tiber. women has positive, long-term, socio-economic effects Training through the Green Building Council of South as women tend to invest their income in the health and Africa, she found an excellent mentor in Green Star education of their families. Accredited Professional, Gideon van den Berg, from The non-profit company WB HO. Nomasonto has seized these opportunities and Khuthaza sees unlimited made the most of them. At 26, Nomasonto is a Green Star potential for women in Accredited Professional and proud of what both she and the construction industry Tiber are delivering. and facilitates career and "We're very proud of No mason to," says Tiber's enterprise development, as Cardoso. "By supporting her education and providing well as capacity building in opportunities to develop her career, we recognise that she the industry. adds significant value to our company and the industry as During 2010, Khuthaza a whole:·• assisted Tiber Bonvec Con struction identify young More information from Elizabeth O'Leary, women for their bursary Tel: +27(0) 11 275 0268 I www.khuthaza.org.za Nomasonto Tshehla programme, one of whom 30 CONCRETE TREN DS August 2013 products & services Innovative cement gets sleeper contract steaming ahead imberley-based company, Rail 2 Rail (Pty) Ltd our innovative CEM II formulation for Rapidcem proved more (“Rail2Rail”), awarded the cement supply contract suitable than CEM 1 52,5N products.” K for the production of one million concrete rail Rapidcem’s success stems from the siliceous fly ash sleepers for Transnet Freight Rail, to Lafarge South Africa. incorporated in its design, meeting the need of precast Lafarge focused its considerable technical resources customers for high early strength and superior ultimate on providing an innovative and sustainable solution for this strength performance, combined with enhanced workability infrastructure development. The cement chosen to produce and flowability. Hardened concrete is also denser and more the highly specified, durable rail sleepers was the company’s durable. Rapidcem CEM II 52,5N, backed by an extremely strong QDSA is maintaining an extensive ongoing service to technical support package. Rail2Rail and the value-added service involves transparency With over 24 000 tons of cement supplied for the with Lafarge’s own ‘Usage Quality’ testing – providing peace manufacture of more than 400 000 sleepers, Rail2Rail is of mind by monitoring cement performance as well as checking impressed by Rapidcem’s consistent quality and Lafarge’s the suitability of the fine and coarse aggregate being used, excellent technical support. Rail2Rail has a licence agreement something Transnet Freight Rail requires from Rail2Rail. with Rail One Gmbh in Germany, and is supplying the concrete ‘Usage quality’ data provided to Rail2Rail includes a sleepers to maintain railway lines throughout South Africa’s monthly chemical (oxide) analysis of Rapidcem, as well as 22 000-km network. weekly auto-control data (early and late prism strength, Lafarge’s respected Quality Department Southern Africa initial setting time and soundness). Weekly testing is (QDSA), played a pivotal role. “We had to undertake special done on a random sample of Rapidcem delivered from laboratory tests monitored by a technical expert from Rail One,” the Lafarge Lichtenburg Cement Works. This checks early says QDSA’s manager, Dr Reinhold Amtsbüchler. “The sleepers strength performance, under typical steam-cured conditions, were required to meet a demanding specification, including to confirm the positive response of the CEM II 52,5N to achieving a 28-day strength of 60 MPa, and a rigorous quality heat/steam curing as undertaken at the Rail2Rail factory. control programme during production. We were pleased that After a recent customer service visit by QDSA, it was decided to look at further mix optimisation. Laboratory investigations include using QDSA’s programmable curing chamber that can simulate site conditions at the Rail2Rail factory. “The Lafarge product is excellent, both from a performance perspective and its consistent quality,” comments Rail2Rail’s MD, Ashley van der Berg. “We also value Lafarge’s partnership approach to helping us with this challenging rail sleeper contract. Their technical and sales teams work closely with our people and are always willing to go the extra mile for us.”n More information from Charlene Lamb, Tel: +27(0)11 657 0000 / www.lafarge.co.za Rail sleepers made with Lafarge Rapidcem CEM II 52,5N. 32 CONCRETE TRENDS August 2013 CctrehfilTM SPECIAliTY FIBRES www.corehfil.com Corehfil™ PP Fibre is specially manufactured as a concrete additive to limit plastic shrinkage and control early cracking in cementations products and can b e used in: • Commercial, Industrial & Residential Floor Slabs • Bridge Decks • Precast Concrete Products • Plasters & Mortars • Thin Panels • Secondary Structural Reinforcement • Architectural Finishes • Refractor y Casting Moulds • Marine & Hydraulic Structures • Shotcrete Benefits of Corehfil™ • Low cost secondary reinforcement • Increased flexural strength • Reduces concrete cracking due to plastic • Light Clean and Safe to use shrinkage and settlement • Protects primary reinforcement by • Reduces setting time inhibiting surface cracking • Improves impact & abrasion resistance • Decreases concrete permeability Official Supplier For Lafarge ReadyMix Fibre Concrete L LAFARGE AGGREGATES I READY MIX Manufactured by: AN ISO 9001 COMPANY South African Polypropylene Yarns (Pty) Ltd 30 Anderson Road, Hamrnarsdale, South Africa For futher details contact1 Steve Rich ards, Sales Manager Tel: +27 31 736 8700 • Fax: +27 31 7361589 • [email protected] Simply 'plug and poke' for great concrete tlas Copco Construction Technique has introduced a range of eight smart electric pokers that are light, A maneuverable, reliable and easy to use. "Simply plug the electric poker into the wall socket and commence poking," says Neville Stewart, business line manager Construction Tools Division at Atlas Copco Construction Technique South Africa. Construction, roads and infrastructure are some of the The poker's motor-in-head design gives high power and primary markets necessitating the use of a poker to remove air stable speed. in concrete to in crease strength . "Structures such as dams and Product reliability is in creasingly important for projects in bridges exposed to high loads require high-strength concrete; remote areas because, once the concrete has been poured, the usi ng high-frequency pokers contributes to the desired finish," project cannot afford the poker to fail, especially w ith suppliers explains Stewart. to solve the problem far away. " To combat this problem and " Electric pokers are generally used in more specialised ensure continuity, contractors must carry three to four times applications so the market is smaller than for traditional more pokers as spares," Stewart says. mechanical pokers," continues Stewart. "But with the "Besides the extra cost of purchasing spare units, it also many infrastructure and government projects there's been causes expensive logistical problems as the pokers must be steady growth in demand for electric pokers in the South transported and stored, adding further costs. This is where African market. We see great local potential for our new our electric poker comes into its own. It does not require some electric poker range." of the heavier parts and, though li ghter, delivers a better and stronger finish." Stewart adds that with fewer restrictions in the design, it is possible to offer a wider variety of models for different applications. "Getting the job done faster w ith fewer dips to remove air voids from the concrete, is w hat we are aiming for," explains SRotthe Philippe Livernette, product line manager Concrete Equipment. .---. difference "The high power, stable speed and high centrifugal force of our electric pokers, due to the electric motor-in-head design, provide a wide radius of action and rapid acceleration." Thanks to the built-in frequency converter, all that is required to start working is a regular wall socket with the appropriate voltage. The motor-in-head design also helps 1. 2. to keep vibrations where they belong - in the concrete If you can't find any, don't worry. rather than in the operator's hands and arms. The " E" There are none. pistol grip handle reduces hand/arm vibration even further This is because homogenisation solutions from EIRICH produce (down to 0,56 m/s2). The Smart Series features built consistently high quality mixes in over 150 industry segments, in protection against shock, overload and overheating. including ceramics, building materials, glass, metallurgy, agricultural chemistry and environmental protection. Quality pokers also mean lower maintenance costs and have Benefits unique to EIRICH: a longer lifespan. Atlas Copco is a solutions-driven company • Energy efficiency with shorter mixing times and we understand what the cost of ownership means to a • Consistent batch quality Catch us at BAUMA contractor. We have the expertise to assist our customers in • Potential cement and pigment savings for latest products, • Longer machine life trends & much more! choosing the right tool for optimum efficiency." • • Suitability to all types of concrete (Stand 387, HallS) Birkenmayer is the sole manufacturer and supplier More information from Neville Stewart, of EIRICH mixers in South Africa. Tel: +27 (0)11 821 9351 I www.za.atlascopco.com Tel: +27 (11) 970 3880 • www.birkenmayer.co.za The environmentally-friendly attributes of fly ash products are recognised worldwide. Each ton of fly ash used in cementitious products saves approximately one ton of C02 emissions, which means our fly ash has saved South Africa an estimated 6 million tons of harmful greenhouse gas emissions over the last decade alone. Ash Resources )}(GREEN BUILDING COUNCIL,A Fly ash products I . ~. ~L· ORG NISATION Push to specify readymix concrete mproving quality of concrete on construction sites is a top According to SARMA director, priority for recently appointed general manager of the South Nico Pienaar, the appointment of IAfr ican Readymix Association (SARMA), Johan van Wyk. a general manager was key to the He says that while sterling work has already been done by next phase of the Association's the Association to formalise the readymix industry and improve (and the readymix industry's) the quality of concrete produced by its members, industry development. professionals and financial institutions still need to be shown "We have set standards for the benefits of specifying SARMA-approved concrete for all their safety, health, road transport, Johan van Wyk, the new projects. environment and quality which GM of SARMA. "Readymix concrete is so versatile that there's little reason to we uphold through annual audits. This has vastly improved use anything but SARMA-approved readymix on construction standards at SARMA-operated plants and gives concrete users sites. The SARMA badge on our members' trucks indicates that the benefit of purchasing readymix concrete that conforms to they uphold our strict standards and that their sites are quality SANS 5878." audited at least once a year. Se lf-mixed concrete, or concrete Van Wyk says that with most of the groundwork already supplied by a non-SARMA member, carries no such assurance. done, it is his aim to educate the rest of the market on th e "That's why I want to make it one of my priorities to engage importance of using quality. professionally batched and quality organisations representing architects and engineers to prove to assured concrete from companies able to produce to quality them that only SARMA-approved readymix should be used. After standards, have reputations to uphold and comply with SARMA's all, when we need the services of an engineer or architect, we codes of practice. are sure to select suitably qualified individuals, so why not do the "We need to reach end-users and listen to their experiences. same when specifying concrete?" We want to understand their requirements and help members adapt to meet these expectations. "Also, we want to act as a one-stop advisory to users on technical issues as well as matching their requirements to the appropriate SARMA member in their region. We will expand our members' services to include training and practical workshops to improve quality or adopt new techniques," VanWyk explains. SARMA will draw on VanWyk's knowledge and experience SARMA to develop training material; his background in lecturing and SOUTH AFRICAN AEA!11'MIX ASSOCIATION research supports the next phase of the industry's development. Become a SARMA member "Sharing my knowledge and training are passions of mine and when the SARMA position became available I jumped at the opportunity. The Southern African Readymix Association "As the emphasis in the construction industry turns to represents the interests of the readymix industry, the provision of sustainable, quality building products, our promotes the use of readymix concrete and acts association remains committed to environmentally acceptable as a forum for member companies. practices and the enforcement of the highest quality standards to provide the industry with the best quality readymix concrete SARMA now offers members access to a for construction." Quality Management System covering standard " I will continue training, but w ill also work to move the operating practice for readymix plants, as well construction industry in the direction of quality. My knowledge as training and discounted rates for expert of cement, concrete, aggregates and additives will enable me assistance with implementation, internal audits to investi gate quality issues and enforce sanctions on member and ISO 9001-certification issues. companies where necessary." adds VanWyk. Van Wyk invites all construction industry role-players to SARMA's vision highlight areas of improvement or introduce new ideas to South is to make readymixed concrete Africa's already well-developed readymix industry.• the construction material of choice, and quality is the cornerstone More information from Johan van Wyk, Tel: +27(0)11 791 3327/www.sarma.co.za Tel 011 791 3327 [email protected] www.sarma.co.za Sika launches new premises in Port Elizabeth ika's PE branch celebrated the launch of its new premises in May 2013 w ith a festive event, attracting a sell-out Scrowd of 150 guests. The Port Elizabeth branch services the region spanning George to Middelburg to East London. Having outgrown their old premises after ten years, Sika PE is now situated at 226 Commercial Road, Sidwell, Centrahill. The larger property will ensure there is space for Sika's increased stock levels, with warehousing space augmented from 380 m2 to 1000 m2 (1 00 pallet spaces to 250 pallet spaces), thereby Visitors tour the newly launched premises in PE. also reducing logistics costs. Offloading the 24-ton truckloads from NDC (Sika Head Office warehouse) every week is faster dock leveller for offloading containers. now that a forklift is able to offload from both sides, without At the opening, Sika PE Branch manager, Jean le Roux, turning the truck around inside the vast yard. There is also welcomed guests and introduced the PE Staff before handing additional safe and secure parking for clients and staff. over and introducing Pau l Adams, MD Sika Sou th Africa. Of significant benef it is the visibility of these new premises Thereafter, Pau l Adams presented an overview of Sika globally to passing traffic as they face the N2 and t he busy R72 (to and nationally and explained the company's global change from Uitenhage), already resulting in increased walk-in trade. Bo ld Business Units to Target Markets. He also gave an overview of Sika signs erected on the buildings can be clearly identified, the new Sika premises in South Africa. • creating furt her brand awareness. Future plans for the new premises include: transporting imported stock via Coega Port; More information on Sika products and systems installing a co ld room to store automot ive stock; and building a at www.zaf.sika.com • Easier to handle • Quicker to install • Better adhesion with less movement f:llailable on Figure 3, 7, and 8C 1OOOmm kerbs. Advantages of Castle Bottom Kerb, Compared to Conventional Kerbs • The cavities provide a grip for installers when laying the kerbs. This enables much easier handling • The cavities make the Castle Bottom Kerb much quicker and easier to install. Where unlevel screed surfaces force installers to uplift. fill up and re-lay conventional kerbs it is easier to manoeuvre a Cas~e Bottom Kerb into place with the screed being displared to the cavities in the kerb • The CasHe Bottom sinks into the screed providing much better adhesion and many more poin1s of sure bonding • The Cas~ Bottom is less prone to movement than conventional flat kerb surfaces once the bedding has cured • The flat bottom of conventional kerbs do not have consistent support from the screed as the screed is never a perfect match to the bottom surface of the kerb. The entire bottom surface might therefore not be in contact with the screed resulting in kerb breakages once weight is applied from above. The regular points of sure bonding of the Cas~e Bottom Kerb and their proximity to each other negate this possibili1y BOSUN B R I C K I Expect the Best ..w products & services Accelerators bring benefits to winter concreting he use of accelerating admixtures in concrete mixes in urgent concrete repairs and in ocean defence applications to winter is essential to increase the rate of hydration and ensure early hardening of the concrete in tidal zones. Tmaintain the correct setting time of the concrete, says Accelerating admixtures are classified in three categories: Eddie Correia, Chryso Southern Africa’s technical manager. The • Set-accelerating admixtures which boost the concrete’s company supplies several types of accelerators to the building stiffening rate; and construction industries. • Hardening accelerating admixtures which increase the rate of hardening and achieve early strength for earlier demoulding and handling; and • Set accelerating/water reducing/plasticising admixtures which produce the effect of a water-reducing/plasticising admixture combined with that of a set accelerator. Accelerators either contain calcium chloride or are chloride- free. Most concrete specifications limit the use of admixtures containing calcium chloride to unreinforced, plain concrete as the chloride can cause corrosion and damage metal embedded in the concrete. Accelerators containing chloride are also unsuitable for blended cements, particularly those containing fly ash. “In the interests of environmental protection and safety of workers, there is also a swing today towards using chloride- free accelerators, although in some applications chloride has to form part of the accelerator formula,” Correia adds. “Hardening accelerators can significantly increase the early strength of ‘winter concrete’. It has, for example, been noted that at temperatures of between 5 to 10°C, an improvement of 200% in concrete strength can be achieved. “The setting time of concrete containing an accelerator, furthermore, will be substantially shorter. Acceleration Chryso’s admixtures help overcome winter challenges. improvement of between one to two hours can be achieved Correia says colder weather results in colder concrete – with a set accelerator and under an hour for hardening which can significantly delay the concrete setting time, as well accelerators. The type of accelerator, dosage and temperature as finishing and power trowelling operations. will affect the timing improvements,” Correia adds. “The “It must be emphasised that accelerators affect only the degree of acceleration depends on the dosage rate so the cement part of the mix and do not depress the freezing point concrete producer can control the setting rate.” of water significantly and should therefore not be regarded Accelerators can be used for winter production of a wide as anti-freeze agents – exposed concrete should still be variety of concrete components including blocks and bricks, protected and properly cured. However, the use of accelerators pavers, segmental retaining walls, roofing tiles, and pipes. in the concrete mix reduces the risk of damage by freezing Accelerators can also effectively be used in summer’s warmer when concreting in cold weather and also allows for the temperatures, but are particularly important for cold-weather earlier removal of formwork,” Correia adds. “Accelerators concreting operations. also produce concrete that is more resistant to chipping and Chryso SA’s range of accelerators include Chryso Xel 650, a breakage during handling and can minimise bleeding and chloride-free accelerator for low temperatures; and Chryso Xel segregation.” CV, a chlorinated admixture for mortar, particularly suited to He says accelerators can be used in conjunction with Chryso the precast industry.n SA’s range of superplasticisers when very early-age strength is required, particularly at low temperatures. Accelerators can also More information from Kirsten Kelly, be used with high-range water reducers to further enhance Tel: 011 395 9700 / www.chryso.com early strength development. The admixtures are suitable for 38 CONCRETE TRENDS August 2013 A new in-situ waterproofing system from Mapei Concrete Equipment Solutions and Technology apei South Africa's latest offering to the local market is the Purtop in-situ membrane waterproofing system. For the past fi ve years, the Mapei tech M nica l service team has been introducing the local construction industry Make Certifiable Concrete, to the benefits of the advanced buildin g technology additives, sealants, adhesives Anywhere, Anytime. and concrete performance chemicals that are available from the international Mapei Group. Offering market-leading performance and handling advantages, Mapei's 1400 products are recognised throughout Europe, America and the Far East. Two grades of Purtop are being offered: Purtop 400M and Purtop 1000. The 400M grade is a two-component solvent-free product that is applied by spraying w ith a high pressure, bi-mixer pump to form a hybrid polyurethane membrane. The membrane is suitable for applications such as the immediate on-site waterproofing of decks on bridges and viaducts. It has extremely good resistance to alkalis, dilute acids and de tergents, combined w ith excellent tensile (14 N!mm2 in terms of DIN 53504) and tear strength (55 N/mm2 according to ISO 34-1 ), while its rapid set allows light foot traffic w ithin 20 minutes. 460DB CBV Purtop 1000 is a two-com ponent, solvent-free product that is spray-applied to form Easy-to-manoeuvre a pure polyurea membrane. Su itable for continuous expo Four-wheel drive sure to water. the membrane True batching plant is used to waterproof storage tanks, basins and water works in general. Th e product also has extremely good resistance to alka lis, dilute acids and de Purtop being applied to a prepared surface. tergents, combined w ith ex- ceptional tensile strength (25 Nlmm2 in terms of DIN 53504) and tear strength (96 Nlmm2 according to ISO 34-1). Due to its quick set, light foot traffic is possible w ithin 10 minutes. Both Purtop products may be used on new and old structures to form a continu ous waterproof coating w ith an exce llent bond to a w ide variety of materials. The membrane adapts to any shape of substrate w ithout crackin g. Ideally, the membranes should be formed on a surface that has been prepared by sanding or shot-blasting. In keeping w ith Mapei's total so lution approach, a range of primers for different sub strates is available, as well as preparation systems for less than id eal surfaces. These include cavity repair grouts and epoxy primers to speed up work w hen residual moisture leve ls in the substrate are higher than recommended, and rust prevention ' .. , P.MSA s upplie>s th e. a ll n e epoxy primers for steel. Fiori DB 260 GBV and DB, 460 . CBV, Mapei South Africa is confident that Purtop 400M and Purtop 1000 w ill add to (Concrete Hatching V~hjde ) allow~ng , their track record for setting new performance benchmarks for speciality chemica ls in ( the manufacture.·Of .ce'rtmable concr¢te; . anywhere, arwtime. t· the local co nstruction industry.• I ©2012 More information from Candice Santana, Tel: +27(0)11 552 8476 I www.mapei.co.za Contact us today Tel: +27 11 578 8735 [email protected] August 2013 CONCRETE TRENDS 39 www.pmsa.com products & services a.b.e. Construction Chemicals opens a dustless powder plant s part of its sustainable development programme, the the enclosed conveyor belts linked to the hoppers where the Chryso Southern Africa Group has built a new plant products are batched. Afor dustless manufacture of cementitious powdered “There is a minimum degree of manual labour involved as products at the Boksburg premises of a.b.e. Construction certain compounds and pigments must be added manually Chemicals, which is part of the Group. as they are not stored in silos. a.b.e. has also substantially The new state-of-the-art powder plant started operating reduced the need for staff to manually lift heavy bags of at the end of November 2012, replacing a 30-year-old product, reducing occupational health and safety hazards.” production facility that required modernisation. It is, unlike its As a result of the increased automation and new predecessor, almost fully automated. equipment, the plant’s production capacity will now be double Mario Marais, the a.b.e. Construction Chemicals GM: – or more – than previous output levels, without the need for Operations, says many of the products a.b.e. supplies to increased staff numbers. the construction and hardware retailing sectors were first a.b.e.’s new powder plant is located behind the present manufactured over 70 years ago. “The need to produce factory in Boksburg and future plans include the conversion of materials with meticulous care to achieve top quality has the old powder plant to a liquid production facility. remained unchanged, but globally there is today an emphasis Marais says the investment in the new powder plant, on respecting the environment and the safety of staff. coupled with the upgrading of the company’s Isipingo plant “Dust levels are a major concern at powder plants so, as form part of the Chryso Southern Africa Group’s continuing a safety precaution, extractor fans were installed in the new commitment to investing in future growth and sustainable factory and all a.b.e. employees working in the plant must development. “The plant is another example of the Group’s now wear respiratory masks. As the dust levels were very high, emphasis on supplying dustless products. a.b.e. is now the additional safety measures were required and a new dust-free only company in its sector supplying dustless mortars, grouts, ribbon-blade blender was installed and dust-free modifications plaster and self-levelling products in Africa. The ‘dustless’ made to other plant. To prevent dust escaping, the plant’s concept has been devised and patented by the Parex Group, conveyor belts were enclosed and the plough blenders, sealed. a subsidiary of the Chryso Southern Africa Group’s holding The new bagging unit is also enclosed.” company, the Materis Group in France. Marais says as a further commitment to staff safety and “We regard these exclusive rights to manufacture and dust-free products for customers, the plant’s plough blenders distribute dustless products as a major advantage over are fitted with atomisers that convert liquid to a vapour-like competitors in the ‘green age’ the industrial sector is now fine spray. experiencing,” Marais adds. n To reduce manual input, the new plant’s nine silos are fitted with Programmable Logic Controllers (PLCs). The silos More information from: Kirsten Kelly, release the exact required amounts of raw materials on to Tel +27(0)11 395 9700 / www.chryso.com 40 CONCRETE TRENDS August 2013 Diamond Products launches the Titan wall saw Concrete Equipment pecialists in large-scale precision cutting and demolition projects can benefit Solutions and Technology from the new range of Titan high-frequency wall saws, which were introduced Sto th e local market in June 2013 by Diamond Products- a leader in the manu facture, assembly and sale of diamond tools and equipment for industrial applications. Brick &Block Machines Diamond Products director Darryl Gray says th e technologically advanced Titan high-frequency wall saw can be diagnostically tested and even repaired using mobile PMSA is the largest manufacturer of phone technology. " In the event of failure, Diamond Products is able to log directly brick, block and paving making into the Titan control unit using the telediagnostic service and telemaintenance system machinery in Africa. Offering start-up via mobile phone communication, in order to detect and address the cause of failure." to fully automated plants, from 7,000 to 165,000 bricks per day. This advanced system allows parameters to be modified for special applications, and for the latest versions of the automatic control system to be transmitted to any control unit, regardless of time or loca tion. "The remote system even has tracking capabilities, thereby reducing losses due to theft," adds Gray. .I ill i RE 1400 Diamond Products co-director Brian Clark explains that the Austrian-manufac i~ ~. ~·,·~. _'\.. ."~ij.} I i ~ _l ~~~. ,; Static plants available Up to 105 000 pavers per day tured Titan wall saws boast a greater life ..... ' . ,· ' Up to 165 000 bricks per day ~ expectancy than competitor electric wall ,/. Semi· or fully automati<: saws, thanks to their unique low motor speed design. " The motor speed is just 6 500 rpm, compared to th e industry standard of 30 000 rpm. This ensures significant reductions in maintenance VB4X and service costs." Static plants available Up to 63 000 pavers per day With high torque and lower speeds, Up to 100 000 bricks per day Semi· or fully automatic the Titan high-f requency wall saw can Diamond Products' demonstrates accommodate blades of up to 2000 mm the new Titan wall saw. in diameter, w ith high performance and precision. The Titan wall saws operate at maximum precision using ARIX G2X Dia mond blades, in which diamonds are aligned in an almost grid-like system to all ow for VBlX consistent drilling and sawing speeds. Mobile or static plants available Up to 31 500 pavers per day "In standard tools, diamonds are mixed randomly throughout the blade surface, Up to 60 000 bricks per day which results in excessive wear because different areas of the surface carry varying Semi- or fully automatic workloads. W ith the alignment of diamonds in separate rows, AR IX technology ensures that each diamond carries precisely the same workload, enabling quicker and more accurate cutting," Gray adds. Another unique feature of the Titan wall saws is that they can accommodate a RE600 drive pull ey for wire sawing app li cations through specialised pull ey and storage attach Mobile or static plants available ments, which eliminate the need for large and costly machines. Up to 15 000 pavers per day Up to 28 000 bricks per day " This attachment makes the Titan high-frequency wall saw a two-in-one machine, Semi· or fully automatic enabling the user to select a cutting method appropriate to a specific application. Diamond Products ARIX razor wire is compatible with the saw, and delivers an optimal Full range of moulds available cutting speed, w hile providing the contractor with an ideal cutting solution in the toughest applications. "The Titan high frequency wall saw units are lightweight and compact, without sacrificing power and durability," he states.• More information from Darryl Gray I Brian Clark Tel: +27(0)11 552 8310 I www.diamondpc.co.za Contact us today Tel: +27 11 578 8735 sales@ panmixers .co .za August 2013 CONCRETE TRENDS 41 www.pmsa.com products & services Roof tile machine designed specifically for Africa launched by PMSA an Mixers South Africa (PMSA) has extended their local of ABECE associated machinery and technology as part of the offering by introducing a new range of concrete roof partnership.” Ptiling machines to the southern African market in April ABECE area manager, Fredrik Toftemo, believes that the 2013. partnership with PMSA will help ensure that the company The first model of roof tiling plant launched is the SPS712, expands its geographical footprint across Africa. “I see manufactured by Swedish-based roof tile expert ABECE. tremendous growth opportunity for this machine in Africa, PMSA marketing and sales manager, Quintin Booysen, says especially with the rapidly growing cement industry, in addition the machine has been to the government infrastructure projects planned in South developed specifically for Africa and beyond. By working closely with an established the unique African partner such as PMSA, we can ensure that we remain at the market as part of a forefront of a market that has unlimited potential.” joint effort between Booysen is optimistic of the future outlook. the two companies. “PMSA is constantly expanding the “Special considerations had range of its products in- to be taken into account, especially house, and also, low skill levels, climate and particular through strategic requirements in Africa. As a result, the partnerships such SPS712 is equipped with features such as this one with as a dual stop/start function, which ABECE, we plan requires the operator to use both hands to keep track of to start or stop the machine, thereby ensuring that the market’s needs hands are out of harm’s way at all times,” he explains. over the next few To ensure ease of maintenance and cleaning, Booysen years, and develop products to suit those points out that the extrusion head of the machine flips specific requirements,” he concludes. upwards. “The SPS712 roof tiling machine is also easily repairable, as all working parts are readily accessible and do About PMSA not require any special tooling to remove parts,” he adds. Pan Mixers SA is a leading manufacturer of a wide range “The SPS712 roof tiling machine makes use of an aluminium of concrete block, brick and paving machinery, turbine and palette to shape the tiles, and is capable producing between counter-current pan mixers and batching plants for the 3 000 and 5 000 tiles per nine-hour shift, depending on plant concrete, refractory and ceramic industries. Pan Mixers have configuration. This machine is a baseline model, designed for been servicing the needs of local and overseas customers since small to medium sized businesses.” 1976. PMSA brick-making machinery, in the Johannesburg area Although the SPS712 roof tiling machine was initially alone, produces 2 000 000 bricks per day.n manufactured by ABECE in Sweden, Booysen indicates that PMSA will manufacture the model locally according to More information from Quintin Booysen, demand. “PMSA identified a gap in the southern African Tel: +27(0)11 578 8756 / www.pmsa.com market for roof tiling technology and expertise. Having developed a reputation as a supplier of world-class equipment and solutions for concrete product manufacturers in Africa, I am confident that the SPS712 roof tiling machine and SPS range of plant will complement our existing range, and add value to our overall offering.” The relationship between ABECE and PMSA dates back to 2005 and they have worked jointly on fully automated roof tile plants in South Africa with capacities of up to 140 tiles per minute. “In addition to introducing the purpose-built SPS712 machine locally, PMSA will also offer the full range 42 CONCRETE TRENDS August 2013 New 'green' non-chloride accelerator from Chryso S.A. Concrete Equipment Solutions and Technology hryso Southern Africa has, in further pursuance of its sustainable construction philosophy. launched a revolutionary safe 'green' accelerator for use with Cblended cements. Eddie Correia, Chryso SA's Technical Manager, says Chryso Xel 680 EMx- the latest addition to Chryso's respected range of accelerators- is a non-chloride, calcium-based, harmless liquid accelerator. " The launch of Chryso Xel 680 EM x admixture follows extensive research and development by Chryso SA's holding company in France, bringing to the market an accelerator that optimises the hydration synergies of blended cements, while enhancing strength performance. It produces breakthrough acceleration performance w hen used with blended cements particularly CEM 111, or concrete mixes containing Slagment or fly ash," Correia states. "The new user-friendly accelerator is compatible with most cements with all Chryso water reducers and is suitable for rapid hardening of both readymix and precast concrete." Some of the benefits of the new accelerator include: • Enhanced co ld-weather concreting which improves concrete containin g blended cement's resistance to freezing in low temperatures; • Improved productivity (earlier demoulding, pouring/stripping time reduction); • Reduced steam curing costs with related energy savings; • Reduction of alkali-silica reaction (ASR) in low alkali content concrete mixes; • Unique workability retention/early strength ratio especially when combined with Chryso superplasticisers such as the ChrysoFiuid Optima range; • Excellent performances and both early-age and 7-28 days, producing super durable concrete; and • Improved plant safety. Correia says Chryso Xel 680 EMx is another Chryso product that contributes to the company's ongoing quest for sustainable construction so lutions and forms part of the company's Enviromix technology. " Enviromix products enable concrete producers to design and manufacture concrete that is both 'greener' and, at the same time, more profitable. Enviromix boosts Supplementary Cementitious Materials (SCM) such as slag or fly ash performance, thereby allowing significantly higher ratios of cement replacement whil e maintaining the desired plastic and hardened concrete properties. Enviromix technology can be used for all kinds of concrete using SCM: readymix, self-compacting concrete, precast concrete and site-batched concrete," he states. Chryso Xel 680 EMx augments the Chryso SA popular range of accelerators which include Chryso Xel 650, a non-chloride based set acce lerator suitable for low temperatures; and Chryso Xe l CV. a chlorinated admixture for mortar and concrete particu larly su itable for the precast industry.• More information from Kirsten Kelly, Tel: +27(0)11 395 9700 I www.chryso.com Contact us today Tel: +27 11 578 8735 sales@ superfloor.co .za August 2013 CONCRETE TRENDS 43 www.superfloor.co.za products & services Hydrophobic admixtures improve durability and impermeability By Ted Horan ycrete, Inc., the leading provider of hydrophobic admixtures, was recently launched in Africa at Hthe Totally Concrete Expo in Johannesburg and is already being requested for projects throughout the continent. Benefits include reduced design and construction risk, and savings in time and money. Concrete is inexpensive, readily available, versatile, and strong. However, it is also vulnerable to water penetration by capillary absorption. Water and dissolved materials (such as chlorides and sulphates) penetrate concrete, resulting in concrete degradation, rusting of steel reinforcement, water infiltration into interior spaces, and increased interior humidity levels. Water damage can necessitate costly and disruptive maintenance and repairs, and even litigation. Architects and engineers worldwide are turning to hydro- phobic admixtures to enhance concrete durability (including protecting steel rebar from corrosion), minimise concrete In the Solair Wilshire project, Hycrete saved $255 k in time maintenance requirements, waterproof structures, and protect and $208 k in materials. flooring from moisture-vapour-related failure. Hydrophobic admixtures also protect concrete against sul- How water (and dissolved chemicals) move through phate degradation. Available in liquid or powder-based solu- concrete tions, they are typically introduced directly into concrete mixes. Moisture migration into concrete is the leading cause of concrete degradation and capillary absorption is the primary Applications water transport mechanism. As mixing water leaves concrete, Hydrophobic admixtures are used in many applications and it leaves behind a porous capillary structure. Capillary absorp- building types to help increase concrete durability and solve tion is the movement of water (and dissolved chlorides and waterproofing challenges. sulphates) through porous concrete without an externally Hydrophobic admixtures inhibit corrosion, enhance the life applied hydraulic head, and results from interactions between of concrete and eliminate the need for topical coatings, which water and the pore wall. often have to be re-applied periodically. Capillary absorption is so powerful and rapid that it Leaks in concrete structures can result in damaged interi- requires no pressure to function and is potentially far more ors and equipment, costly downtime, and litigation. Integral damaging than any other transport mechanisms. To ensure waterproofing can save time and money – all with a perfor- durable concrete it is the designer’s primary duty to adequately mance warranty. address capillary absorption. Hycrete has received numerous awards for its patented technology, and its admixtures are Cradle to Cradle CertifiedCM How hydrophobic admixtures protect concrete Gold and safe in potable water applications.n Hydrophobic admixtures react with metallic ions, including calcium in cement, to form polymers that repel water. These More information from Tim Morris, polymer formations in the concrete matrix block water ingress Tel: +27(0)21 761-6434 / and reduce moisture vapour transport. Capillary transport www.hycrete.com is stopped and water and chlorides cannot reach steel rein- forcement. Some hydrophobic admixtures react with the steel itself, creating a passivating layer on the surface of steel rebar. 44 CONCRETE TRENDS August 2013 Swiss watches inspire accurate moisture measurement ritish moisture measurement technology manufacturer, Hydronix, has drawn inspiration from the bimetallic strip Bin a mechanical Swiss watch, which remains indifferent to changes in temperature, to develop electron ic hardware and a compensation algorithm that finely adjusts measurements by the state-of-the-art Hydro-Mix VII moisture se nsor to provide measurement accuracy down to 0,1 %. Bu ilding on the success of Hydronix' existing range of moisture measurement devices, ava ilable in South Africa through leading process engineering firm, Birkenmayer, the The new Hydro-Mix VII remains indifferent to temperature. Hydro-Mix VII is ideal for the concrete industry. It can be f itted flush onto screw conveyors, chutes and holding hoppers, and It interfaces with the Hydro-Com software from Hydronix for copes very well with fluctuations in temperature without continuous monitoring via USB or Ethernet, and is extensively compromising results. supported by Birkenmayer in South Africa, as well as by the With a measurement rate of 25 t imes per second and Hydronix global exchange programme.• a choice of measurement modes for optimised sensor performance in a range of app li cations and material types, the More information from Louis Eksteen, Hydro-Mix VII is essential for accurately controll ing water Tel: +27(0)11 970 3880 I www.birkenmayer.co.za addition during the mixing and drying processes. Rebranded as Royal HaskoningDHV, SSI Engineers & Environmental Consultants believes In being more than an engineering company. Our rebrandlng to Royal HaskoningDHV ushers in a new class of engineers and consultants, offering solutions for the sustainable Interaction between people and their environment, ultimately enhancing society together. www.rhdhv.co.za ~ 551 www.royalhaskoningdhv.com • A OHV COMPANY NPC goes back to their roots PC the manufacturer of cement, co ncrete and Th e strength of their product is indisputable, having set aggregates has been backing the South Afncan th e original standard of NPC BLACK and BLUE in the nineteen Nbu ilding industry since 1964 by delivering high quality sixties. In recent years, many lesser-known brands have begun products and unwaverin g service. naming their products after NPC's original BLACK and BLUE Over the years their quality and support has earned them standard, claiming to offer the same quality, bu t regularly a reputation in the building industry as a brand yo u can rely falling short. on. It's widely felt that NPC and constructi on companies are That's w hy after 49 years of consistently delivering premium on the same team. working hand in hand with builders and quality products, NPC has decided to align their identity with contractors to ensure that structures are built to the highest their product offering. This identity expresses NPC's trustworthy standard. heritage and top quality products, and their new pay off line 'the original strength' neatly encapsula tes this. Ultimately builders' reputations are built on their ability to deliver ... and its NPC's strength that has given builders the quality to deliver with pride. Builders' have grown to trust that their objectives and plans will succeed with NPCs backin g. South African great and loca l legend Sha un Pollock shares a lot in common with NPC ... his integrity as an in dividual, his reliable performances, and th e fact that he is a leader on and off the field. A Durban-boy w ith a strong cricket heritage who has performed for, and led South Africa at the highest level ... Shaun Pollock embodies the NPC brand. Shaun has been blessed over the years with strong family support, particu larly from his father, who has seen him grow from strength to strength . Shaun will be the first to tell you that to deliver the highest performance you need the right backing in life. That's exactly w hat he got from his father, uncle and mom, who all passed on the spirit of dedication and a passion for cricket. The right backing gave Shaun inner strength that he grew to trust and that trust developed confidence, w hich allowed him to de liver a superior performance every time. He wouldn't be where he is today if it wasn't for the backing he got from his family. Shaun has signed up to be NPC's ambassador and will feature in a number of NPC print, press and radio ads, as well Renowned cricketer, Shaun Pollock, is the as doing a number of public appearances in the KZN area. Look new NPC ambassador. out for him in your local neighbourhood and meet one of S.A:s With a heritage steeped in integrity. NPC has fostered trust cricket legends. in the industry. a major factor in the se lection of materials, Just like Shaun's success was backed by the Pollock family which reflects directly on the skill and professionalism of for years. so NPC has and will continue to back the buildin g builders. Through co nsistently deliverin g top quality, NPC has industry for many years, th anks to their own backing by one of long been the brand of choice for the South African buildin g the world's leading ce ment companies, lnterCement. industry. It's true .. . your success can often be determined by the NPC are known as the loca l guys w ith world -class quality. backing you get in life. • This is because they are backed by lnterCement, one of the world's top 20 ce ment companies. Resources and leadin g More information from Bavashnee Naidoo, global technologies are invested in NPC f or the development Tel: +27(0)31 450 4492 I www.npc.co.za and de livery of internationally leading products for the loca l market. 46 CONCRETE TRENDS August 2013 For 90 years, SCAW, a South African industry leader, has been a preferred supplier to the construction industry. Whether it's hoisting, reinforcing or excavating, Scaw produces an extensive range of products that drive safety and productivity in construction projects. From wire & strand products, Haggie® Steel Wire Rope, chain products or construction specific steel, Scaw continues to design and deliver the highest quality products to customer specifications. Highly qualified teams with extensive experience in all aspects of the application of our products are on call to advise and support the selection, handling, installation and maintenance of products vital to driving safety, productivity and profit in the construction industry. Join Scaw's global safety and productivity drive, call: Scaw South Africa Tel +27 11 621 1555 EXPERIENCE MATTERS. Haggie ® Steel Wire Rope: Tel +27 11 620 0000 Chain Products: Tel +27 16 428 6000 & SCAW METALS Rolled Steel Products: Tel +27 11 842 9359 Wire and Strand: Tel +27 11 876 2600 ~ GROUP www.scawmetals.com news For your diary aster Builders South Africa (MBSA) – the leading continent,” says MBSA executive director, Tumi Dlamini. representative body in the building industry and Minister of Public Enterprises, Malusi Gigaba, whose Mthe national body of the provincial Master Builders department and its state-owned entities are responsible for the Associations and its affiliated members – will be hosting its vast majority of public infrastructure spend, has confirmed that annual Congress at the Indaba Hotel and Conference Centre he will be this year’s keynote speaker. “Over and above gaining in Fourways, Johannesburg. insight from the Minister’s address, the Congress provides a The theme of this year’s Congress is Building South great opportunity to understand local and global best practises, Africa: Bridging the gap which aims to address the subjects of keep up to date with leading and innovative trends, to network transformation, skills, standards and sustainability within the with industry members and to see who the top performers are building and construction industry. As SA’s leading construction in the Health and Safety Awards,” adds Dlamini. body, the MBSA Congress brings together role players from All members of the building and construction industry are different aspects of the industry including industry leaders, invited to attend the MBSA Congress. For engineers, architects, built environment professionals, academia, youth, member construction managers, regulators or contractors, both large associations and the public sector. This is an opportunity to and small, the Congress is an important event at which to exchange information, participate in discussions and gain address issues affecting businesses. Construction managers, insight from the speakers and aims to facilitate collaboration engineers and architects attending the Congress will gain that will contribute to the development of both the industry Continued Professional Development points. and the country. Sponsorship and exhibition opportunities are available to “The industry has noted a slight but gradual recovery in companies wishing to ensure visibility of their brand, products 2013 which has contributed to confidence and growth, albeit and services, to industry players.n slow. This makes the 2013 Congress an ideal opportunity to address challenges our members’ businesses face, look at ways More information on the Congress website: to enhance skills capacity and review important infrastructure www.mbsacongress.co.za projects and opportunities in South Africa and the rest of the PPC Ltd introduces an Industry News Desk service “This service has been developed for customers as well as the updates and insights as well as advice on technology and other industry as a whole. On PPC’s website, www.ppc.co.za, by industry- relevant information,” states Ketso Gordhan. clicking through on the Africa and South African icons on This service is open to anyone who has an interest in or the page, you can access up to date information, updates is part of the industry and aims to add value to and maintain and insight into the industry. In addition to articles, you can excellence in the cement and concrete space. The news is also subscribe to e-mail alerts that will be delivered daily to independent news and obtained from a variety of sources. your inbox ensuring real-time knowledge of topical issues and developments in the industry,” says Ketso Gordhan, CEO PPC More information from Nomzamo Khanyile, Cement. “Following the closure of the C&CI, PPC Ltd feels they Tel: +27(0)11 386 9309 / www.ppc.co.za have an obligation to the industry at large to provide regular 48 CONCRETE TRENDS August 2013 news 100 years of Slurry n 26 June 2013, PPC Ltd., South Africa’s largest General manager at PPC Slurry, Frikkie van Zyl said, “Lead- producer of cement, celebrated 100 years since the ers have come and gone; markets have risen and fallen; our Ofounding of its Slurry cement factory near Mafikeng products and processes have evolved over time; innovation and in the North West Province. cost-saving opportunities have been exploited. Throughout all From its beginnings, in 1913, the Slurry factory quickly turned this, the one constant thing has been the reliability of our in- the South African cement industry into a competitive and credible team. Day after day (and many a night), the people flourishing market, growing annual cement production from of Slurry have worked tirelessly to keep the business running. 60 000 tons to 128 000 tons annually. They have cultivated a ‘can-do’ culture that is sustained by teamwork, a sense of ownership and account- ability, and taking pride in what they do. We do it together, properly, or we don’t do it at all.” “We move with confidence and excitement into the second century and we are mindful of our responsibility and privilege, to build a new link in the Slurry chain – a link that unites our past with the future generations of the Slurry family,” he said. PPC Chief Executive Officer, Ketso Gordhan, said the company wants to optimise its current operations, and in particular the Slurry, Dwaal- boom and De Hoek plants. “Slurry’s expansion is under way and its manufacturing resources and capable team will play a leading role in ensuring we achieve our objectives. “By continuously investing in our people and plants, the company has built a strong founda- tion on which much of our country and region Situated on the borders of old Transvaal, in 1916, the fac- rests. PPC has a truly remarkable history and a proud heritage. tory produced its first lot of cement and from then on, has For over 120 years this company has used the vision, courage operated at full capacity, breaking production records in quick and sheer determination of its leaders and their teams to navi- succession. gate a course through the nation’s rich, invigorating and, at It is unclear who dubbed the factory ‘Slurry’, the name of times, challenging history. Long may our journey continue,” the mixed raw materials of the cement industry when the wet said Gordhan.n manufacturing process is used. But at the time, the name was apt as the factory utilised a wet process. It was only in the More information from Nomzamo Khanyile, 1950s that PPC changed the cement manufacturing process Tel: +27(0)11 386 9309 / www.ppc.co.za from a wet to a dry process. Slurry was altered accordingly – but the name stuck. August 2013 CONCRETE TRENDS 49 news The Concrete Institute heralds a new dispensation newly constituted industry body, The Concrete Institute (TCI), funded by AfriSam, Lafarge and new A cement producer, Sephaku, will continue the valuable services provided by the Cement & Concrete Institute (C&CI), which closed in April this year after 75 years of service to the industry, following the withdrawal of key funding members. It is hoped that this new body will also play a role in uniting other representative bodies in the built environment to present a more unified front to government. “The C&CI played an invaluable role in promoting the Deciding to take action, we approached Lafarge and interests and general advancement of the cement and Sephaku with a proposal to jointly fund a new, more compact concrete industries as a whole in southern Africa and its and cost-effective body. They readily agreed — for the very closure prompted many to lament the potential loss of an same reasons.” important knowledge repository,” Grant Neser, AfriSam sales Under the leadership of Bryan Perrie, the former MD of the and marketing executive says. “Its value lay in the C&CI’s C&CI, The Concrete Institute opened in Waterfall Park, Midrand, being an industry body representing the entire industry and its in May and is offering most services previously provided by the position and the information it disseminated was completely C&CI, including a free advisory service, the training centre and independent, professional and in no way biased in favour of training laboratory, the information centre, consulting services the cement producers or a particular supplier. and publications. “The TCI will not continue C&CI’s marketing activities as we believe marketing is better accomplished by the respective industry players,” Neser comments. “This will also reduce operational costs. As a non-profit company, in addition to income generated through training and consultation, TCI could generate income through sponsorships and advertising”. “We will invite other built environment industry bodies to participate in guiding the direction of The Concrete Institute by serving on its Board. The private sector has not been effective in engaging government on ways to unlock delivery of government-backed projects, mainly because the built environment private sector has been fragmented in its approach. We believe the participation of other industry bodies in TCI will help establish a more unified industry approach to government and facilitate improved partnerships between the private sector and government. Ideally it could help to enable faster delivery of infrastructure projects at all levels – municipal, provincial and national.” “AfriSam supports industry bodies that add value to our All courses in the former C&CI’s School of Concrete industry and we realised that this body was too important to Technology 2013 Training Programme are being offered by TCI. disappear from the business arena,” says Grant Neser, AfriSam They will also run the Advanced Concrete Technology course, sales and marketing executive. which was under way when C&CI closed.n “The C&CI played an important role in providing training, information, consultation and advisory services to the built More information from Ntaga Mojapelo, environment industry. AfriSam always supports industry bodies Tel: +27(0)11 670 5541 / www.afrisam.com that add value to our industry and we quickly realised that this body was too important to disappear. 50 CONCRETE TRENDS August 2013 construction competion he 4th International Holcim Awards competition, one of the most significant competitions in its field, celebrates projects Tand visions that contribute to a more sustainable built environment and features a US $2-million prize. The regional phase of the competition is now open for entries. It seeks leading projects from industry professionals and spirited ideas from the 'Next Generation' that contribute to sustain ability w ithin architecture, buildin g, civil engineerin g, landscape and urban design, as well as construction materials and technologies. Projects must meet five 'target issues' and the competition has has two categories with different requirements. Holcim Awards (main category) • Project has reached an advanced stage of design with high probability of execution • Execution of the project may not have started before July 1, 2013 • All authors must be at least 18 years of age (date of birth March 24, 1996 or earli er) Next Generation (young professionals and students category) • Visionary projects and bold ideas • All authors must be between 18 and 30 years of age (date of birth between July 2, 1982 and March 24, 1996) T he world is changing around us - everyday. Technological advances demand • Execution of the project may not have started before ongoing upgrades and solutions, upkeep and July1,2013 maintenance, but not ROCLA Culverts and Independent jury panels of renowned architects and academ Wingwalls. Superb design and leading-edge ics evaluate qualified entries against the five 'target issues' for sus manufacturing processes ensure t hat ROCLA tainable construction which cover economic, social and environ provides truly permanent Culvert and Wingwall solutions. ROCL A C ulverts and Wingwalls are mental performance as well as contextual/aesthetic impact, and maintenance-free and never require upgrading - innovation/transferability. The juries are headed by Jean-Philippe if it's not broken, why fix it? Vassal (for Europe), Toshiko Mori (North America), Bruno Stagna (Latin America), Howayda AI-Harithy (Africa Middle East) and Ra ROCLA is ISO 9001:2008 certif ied and has hul Mehrotra (Asia Pacific). A full list of jury members is available t he SAB S mark of approval on all applicable products. at: www.holcimawards.org/juries Online registration is invited until March 24, 2014 at www.holcimawards.org OUR D IFFERENCE IS CONCRETE Contact ROCLA now on Tel: (011) 670-7600 or Fax: 086 675 8985 Web: www.roclaproducts.co.za August 2013 CONCRETE TRENDS 51 news New PPC Builder’s App makes building easy PC Cement has partnered with Digital Solutions Group business, products or services toward an enhanced customer to launch a first-to-market mobile application, designed experience. The vision behind this App was to allow customers to Pand customised for those in building and construction, engage with the PPC Cement brand in an immersive experience, at the 2013 TotallyConcrete Expo, in June. while still offering them access to useful information and tools.” “As a leader in the cement industry, PPC Ltd believes that “This application will assist us in driving a stronger level of it is essential for every builder to have the latest tools at engagement with our customers and further cement our brand their disposal. This will enable them to work more efficiently promise of ‘giving you more cement per bag’. We believe and save money. We believe that this App will do just this that this App will effectively eliminate potential mistakes or and enable every project that uses it to be successful,” said miscalculations; saving both time and money,” said Mooko. Sibongile Mooko, PPC’s GM of Marketing Services. “As the leading cement supplier in southern Africa, this App The easy-to-use App provides many practical functions for enables us to be with you every step of the way. It will calculate professionals in the building or construction market as well how much cement you can buy and where to buy it. By using as avid DIYers. This includes a Quantity Calculator, enabling this App, you will be able to contact PPC and fully benefit from users to calculate the quantity of cement required to complete all that we have to offer,” she said. a job based on the dimensions input by the user. There is also This launch phase of the application will be available on a Weather Watch tool that will advise on the best time of day IOS, Android and BlackBerry operating 6+. “Though this is the to place concrete based on the weather forecast. The Weather launch phase, we have already begun planning exciting new Watch tool allows professional master builders to list several additions and integrations for phase two that will continue locations, so they can monitor weather conditions across all of to promote a user-friendly experience. Also, we’ll undertake their building sites, speeding up the decision-making process regular mobile analytics and quality rating surveying to ensure and prioritisation of jobs to be managed and completed. that PPC Cement’s App remains relevant while building greater Other functionalities include a complete product overview, customer experiences,” concludes Assabi.n store locator with Google-enabled maps and directions, and FAQ. Says Yaron Assabi, CEO and founder of Digital Solutions More information from Nomzamo Khanyile, Group: “One of our specialities lies in finding the most Tel: +27(0)11 386 9309 / www.ppc.co.za appropriate mobile solution that will help a client mobilise their Best Projects Awards 2013 – enter now onstruction World’s Best Projects Awards (BPA) showcases • Civil Engineering and Building Contractors outside South Africa excellence in the South African building, civil engineering and (but done by South African companies) Cprofessional services sectors. Entries are now open for the 2013 • Specialist Contractors or Suppliers awards. AfriSam is the main sponsor of the Awards. • Professional Services Because Construction World’s BPA aims to recognise projects across the • Public Private Partnerships entire construction industry, ensuring that these projects (and the people • The AfriSam Innovation Award for Sustainable Construction behind their success) are recognised by a wider audience than simply the The value of projects does not necessarily improve the chance of entrants’ own institutions, the Awards are judged independently. winning a ‘Best Projects award’ – excellence and innovation are the BPA is the only award in South Africa whose scope includes: civil determining factors. engineering and building contractors; specialist contractors or suppliers; Entry is free. and professional services. In addition, the ‘AfriSam Innovation Award for Closing date for entries: 6 September 2013 Sustainable Construction’ is one of the first awards recognising sustainable Awards function: 29 October 2013 (in Johannesburg) construction to be introduced in this country. What categories can you enter? More information from Wilhelm du Plessis, • Civil Engineering Contractors Tel: +27(0)11 622 4770 / www.crown.co.za • Building Contractors 52 CONCRETE TRENDS August 2013 news MBA North appoints a new executive director ohau Mphomela has been appointed executive director of Master Builders Association North. M Mphomela garnered extensive management experience with top-listed JSE companies such as the MTN Group, Liberty Life Properties, JD Group, The Foschini Group and RMB Properties (Emira Listed Property Fund) between 1994 and 2011. During this period he honed his expertise in the field of business strategy, governance and leadership. He has served as Chairman of the Mintek Board, and also served on the Economic Policy Committee of Business Unity South Africa (BUSA), National Film and Video Foundation Board, Sandton City Merchants Association Board and currently serves as deputy chairman of the Mpumalanga Ehlanzeni District Economic Advisory Council, and deputy chairman of the National Arts Council of South Africa Board. To complement his experience, Mphomela holds a Masters of Business Leadership qualification from UNISA School of Business Leadership, an Investment Diploma (UNISA), Postgraduate Diploma in Corporate Law, University of Johannesburg (UJ), and Executive Global Leadership Programme with Duke University in New Delhi, India. An avid long-distance runner, he often participates in major South African ultra-marathons such as the Comrades, Two Oceans, Loskop, Om-die-Dam, and Soweto Marathon.n More information from Mohau Mphomela, Tel:+27(0)11 805 6611 / www.mbanorth.co.za August 2013 CONCRETE TRENDS 53 news Solidia Technologies wins an R&D 100 Award olidia Cement(TM) was honoured as one of 2013’s top 100 performance, and an enhanced sustainability profile,” said innovations with the R&D 100 Award, considered the Solidia Technologies(R) president and CEO, Tom Schuler. S‘Oscars of Innovation.’ The process was co-invented by Dr. Richard Riman, “Our panel of judges felt that Solidia’s concrete binder Rutgers’ Distinguished Professor of Materials Science and technology, which significantly reduces greenhouse gas Engineering and Solidia’s founder and chief scientist, and Dr. emissions during the production of portland cement, deserved Vahit Atakan, Solidia’s director of R&D and a former graduate recognition as one of the top 100 new technologies of 2012,” student at Rutgers. said Paul Livingstone, senior editor of R&D Magazine. “It is rewarding to see R&D 100 Award winners that offer Solidia’s disruptive technology has the potential to deliver both fundamental advances in these areas of science and profitable, game-changing solutions across the globe by opportunities for real commercial impact,” said Livingstone. employing some of the world’s most ubiquitous materials – For over 50 years, scientists have tried to cure concrete cement and concrete – along with one of its most problematic with CO2 knowing the resulting product would be stronger pollutants – carbon dioxide (CO2). Solidia’s patented process and more stable. Solidia Technologies is the first to make this uses the same raw materials and equipment, but requires less commercially viable. energy, water and time to produce a stronger, more durable Solidia Technologies is pursuing the application of its concrete that costs less. Combined, Solidia Cement(TM) and technology in the $1-trillion global concrete market and its Solidia Concrete(TM) reduce the carbon footprint of concrete supply chain sibling, the $300-billion global cement market.n products up to 70%. “We have taken a very complex technology and made it More information from Solidia Technologies, simple, not only to ease adoption around the world, but also http://solidiatech.com to provide the construction and building materials industries a real competitive edge, with immediate cost savings, superior Free – new title on durability ith durability of structures such an urgent issue 2. Guide to the use of durability indexes for achieving worldwide, this latest publication will be of interest durability in concrete structures (1999) Wto anyone facing durability-related issues. 3. Rapid chloride conductivity testing of concrete (1999) Recently released by the University of Cape Town is 4. Concrete durability index testing manual (1999) Monograph No. 9: Corrosion of steel in reinforced concrete: 5. Repair principles for corrosion-damaged reinforced Influence of binder type, water / binder ratio, cover and concrete structures (2001) cracking, by M. G. Alexander, H. Beushausen and M.B. Otieno. 6. Structural and durability properties of concrete made The work reported here, and by others in the series, has with Corex slag (2003) arisen from a research programme into how to achieve durable 7. The effectiveness of organic corrosion inhibitors for and economic concrete construction in the South African reinforced concrete (2004) context. The present programme has been in existence since 8. A numerical model for predicting early age time-tem- 1997, and is a joint collaborative effort between research perature profiles in large concrete structures (2005).n students and staff at the Universities of Cape Town and the Witwatersrand. The publications are available free of charge from UCT, Tel: +27 (0)21 650 2284 or are downloadable at: Other monographs in this series are: http://www.comsiru.uct.ac.za/component/k2/item/91- 1. Predictions of reinforced concrete durability in the downloads.html marine environment (1997; revised 2001) 54 CONCRETE TRENDS August 2013 Cliauma Africa 2013 September 18-21 Gallagher Convention Centre Johannesburg AFRICA'S PREMIER CONSTRUCtiON AND MINING SHOW more than 500 exhibitors over 60 000 square metres of exhibition space INTERNATIONAL TRADE FAIR FOR CONSTRUCTION MACHINERY, BUILDING MATERIAL MACHINES, MINING MACHINES AND CONSTRUCTION VEHICLES www. ba u ma-africa .com Concrete soars to new heights There seems to be no end to the world's top building material's versatility, writes Jan de Beer eaders of Concrete ifends, no doubt, are well aware in truth it won't be green all year: the researchers are aiming for of the flexibility and versat ility of concrete. But, while biological concrete that will show changes of co lour according Rsurfing the web as my grandson calls the pastime, I to the seasons and predominant families of organisms. But came across some recent concrete applications that would the new concrete will absorb and reduce atmospheric carbon surprise even the staunchest of concrete fans. dioxide thanks to its biological coating. Did you know, for example, that you can now fly a concrete Finally, self-h ealing seems to have got eve n better. The plane? Well, not exactly a massive Airbus, but two American concept of self-healing concrete, readers will know, is nothing students recently made history by becoming the first to fly and new and is mainly based on enhancing a process that occurs safely land an 8-kg remote-controlled concrete aircraft. on its own in concrete: the mineral calcite forming and healing fine cracks. But apparently this concept fails to work fast enough and can also find it way into the reinforcement and corrode it. Now a Korean (South, we must assume - the other lot's too busy building apocalyptic bombs) led by one Chan-Moon Chung has come up with a coating with its own healing agent instead of relying on calcite. Chung's team says that after spraying a micro-layer of polymer capsu les containing the healing agent on to fibre-reinforced concrete, it was co nfirmed microscopically that when This 8-kg, 102-cm wingspan concrete plane actually flies! the self-hea ling coating is damaged, David Haberman and Tyler Pojanowski of South Dakota's the healing agent is released from ruptured micro -capsu les and 102 -cm w ingspan concrete aircraft had, according to reports, fills the damaged region. an " incredibly unstable" test flight coupled with a rough The name of their healing agent is methacryloxypropyl landing but - apart from a cracked wing and f uselage - the terminated polydimethylsiloxane - but, of course you knew plane will fly again after some minor repairs. However, Messrs that, didn't you? Haberman and Pojanowski clearly still have some work to do In conclusion, let's not forget the work of Dr Henk Jonkers before approaching Boeing. from the Netherlands who is renowned for mixing both live Over in Spa in, researchers have shown that concrete bacteria and its 'food', calcium lactate, into cracked concrete. is anything but the dull grey construction component it has He believes the culture will then survive for decades - but time so often been unjustly call ed but can, in fact. be made into only will prove him right. And the name of Dr Jonkers' bacterial a ' livi ng' building material. The Structural Technology Group all y? Sporosarcinapasteuri i, what else? at a Barcelona university has developed and patented a type Web reporter, Daniel Matthews, thinks this is a "cool" idea. of biological concrete that supports the natural, accelerated Engineers will probably think that's an understatement and, like growth of pigmented organisms. Mary Poppins of old, instead describe all these efforts as super The li chen, mossy material - designed for the facades of califragi Ii sticexpi ali docious .... • buildings and other structures in Mediterranean climates - according to the web report" offers environmental, thermal and aesthetic advantages over other similar construction solutions." Loosely translated, it means that such fa\ ades covered with micro-algae, fungi, lichens, and mosses are 'green' (in more ways than one), keep the heat or cold out, and look good. Well, 56 CONCRETE TRENDS August 2013 Crack C CHRYSO - a global leader in concrete technology - offers a range of synthetic fibres to the construction industry. The CHRYso• structural Fibre is a macro fibre that provides the following benefits to concrete: • Post-crack control strength similar to mesh reinforcement • Reduces the occurrence of plastic shnnkage and plastic sett:ement cracking • Enhances long term durability of concrete For fibre-reinforced concrete, CHRYSO nas the technical expertise to assist you with your concrete mixes, optimise the fibre dosage according to the reqwed performance, and choose the correct fibre to suit any application. Contact your CHRYSO representative today. CHRYSO Southern Africa (Pty) Ltd. Gauteng (Head Office): CHRYSO 26 Malcolm Moodie, Crescent Jet Park T: +27(0)11395 9700 I F· +27(0)1 1 397 6644 I W· www.chryso.com CH~'oi i CAl SOLUT I ONS FOR HE Sharecall facility: 0861 CHRYSO CONSBUCTJON >HTPP l l I NCUSTR~