DOCSLIB.ORG

Sustainable Production of Blended Cement in Pakistan Through Addition of Natural Pozzolana

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Sustainable Production of Blended Cement in Pakistan Through Addition of Natural Pozzolana Available on line at Association of the Chemical Engineers of Serbia AChE Chemical Industry & Chemical Engineering Quarterly www.ache.org.rs/CICEQ Chem. Ind. Chem. Eng. Q. 22 (1) 41−45 (2016) CI&CEQ MUHAMMAD IMRAN AHMAD1 SUSTAINABLE PRODUCTION OF BLENDED MUHAMMAD SAJJAD1 2 CEMENT IN PAKISTAN THROUGH ADDITION IRFAN AHMED KHAN OF NATURAL POZZOLANA AMINA DURRANI2 1 ALI AHMED DURRANI Article Highlights 1 SAEED GUL • Ordinary Portland cement is partially substituted with rhyolite to reduce cost ASMAT ULLAH1 • Blended cements employing rhyolite are demonstrated to possess satisfactory com- pressive strength 1 Department of Chemical • Inter-grinding of rhyolite and clinker to produce blended cement shows reduced Engineering, University of energy consumption Engineering and Technology, Peshawar, Pakistan Abstract 2Qadir Enterprises, Peshawar, In this work, pozzolana deposits of district Swabi, Pakistan were investigated Pakistan for partial substitution of Portland cement along with limestone filler. The cem- ent samples were mixed in different proportions and tested for compressive SCIENTIFIC PAPER strength at 7 and 28 days. The strength activity index (SAI) for 10% pozzolana, UDC 666.94(549.1) and 5% limestone blend at 7 and 28 days was 75.5 and 85.0% satisfying the minimum SAI limit of ASTM C618. 22% natural pozzolana and 5% limestone DOI 10.2298/CICEQ141012017A were interground with clinker and gypsum in a laboratory ball mill to compare the power consumption with ordinary Portland cement (OPC) (95% clinker and 5% gypsum). The ternary blended cement took less time to reach the same fineness level as OPC due to soft pozzolana and high grade lime stone, indi- cating that intergrinding may reduce overall power consumption. Blended cem- ent production using natural pozzolana and limestone may reduce the energy consumption and greenhouse gas emissions. Keywords: ternary blended cement, natural pozzolana, limestone filler, cement production. Natural pozzolans have been employed in civil cementitious materials in the process resulting in red- works since ancient times [1]. The addition of natural uction in fuel consumption required for clinker form- volcanic rocks to cement or to concrete mixes results ation, CO2 emissions, as well as enhanced durability in improving chemical and physical properties such as and life cycle performance of the concrete structures reduction in heat release when mixed with water, [3]. good ultimate compressive strength, low permeability, The addition of natural pozzolans to form blended high resistance to sulphates and chloride attacks, and cements has been investigated extensively by reduced alkali-silica reaction [2]. Addition of limestone researchers previously demonstrating benefits in red- as a filler increases the early strength development in uction of energy consumption, green house gas emis- concrete; however, chloride ion diffusion may also sions, and cost [4-7]. The addition of natural pozzo- increase depending upon the blending ratio. A careful lans is constrained due to increase in hydration choice of additives and their blending ratios may yield requirements and decrease in early strength develop- cements with enhanced performances. Cement pro- ment [8]. Blending of cement with natural pozzolans duction may become more sustainable by addition of and others additives offers the advantage of exploit- ing characteristic of various materials while compen- Correspondence: M. Imran Ahmad, Department of Chemical sating for disadvantageous features [9-14]. Blended Engineering, University of Engineering and Technology, Pesha- cements are also produced on a commercial scale, war, Pakistan. for example in Algeria, using natural pozzolana and E-mail: [email protected] Paper received: 12 October, 2014 limestone [15]. Paper revised: 12 October, 2014 Paper accepted: 1 June, 2015 41 M. IMRAN AHMAD et al.: SUSTAINABLE PRODUCTION OF BLENDED CEMENT… Chem. Ind. Chem. Eng. Q. 22 (1) 41−45 (2016) Natural pozzolans are known to react with the these extruded to the ground surface. The estimated calcium hydroxide formed during the reaction of ordi- quantity of deposit above ground level is 9.2 million nary Portland cement with water. The reaction of tons, while the quantity below ground level needs to silica component of pozzolana with calcium hydroxide be estimated after proper drilling. The pozzolana is relatively slow, and produces calcium silicate hyd- deposits of Swabi are whitish in color without any rates. The addition of pozzolana also results in inc- significant variation in size and composition [21]. rease of cementitious aluminates resulting from the reaction of alumina component of pozzolana with MATERIAL AND METHODS calcium hydroxide and sulphate ions [16-19]. This research work attempts to explore the pro- Pozzolana samples were collected and tested duction of blended cements in Pakistan through addi- for chemical, mineralogical composition, using XRF, tion of natural pozzolana for sustainable growth of the XRD, and other properties essential to determine cement, and construction sector. Natural pozzolana feasibility of use as cementitious material. Ordinary deposits are available in different areas of KPK, Portland cement (OPC) was used with natural pozzo- Pakistan such as in Karak, Mohmand agency, Swabi lana from Swabi, Pakistan and high grade limestone and Swat. Bentonite deposits of Karak district have (consisting of more than 95% calcium carbonate) been investigated for partial substitution of ordinary from the quarry of Askari Cement, Nizampur, Pakis- Portland cement in mortars and concrete [20]. tan. The chemical composition of OPC, natural poz- In this paper the natural pozzolana deposits of zolana, and limestone employed in this work are Swabi are investigated for production of ternary shown in Table 1. It may be observed from Table 1 blended cement. Pozzolana deposits are located in that the minimum requirement of oxides as per ASTM Gohatee, on both sides of Swabi-Mardan road as C618, i.e., the sum of silica, alumina, and iron oxides extrusive rocks, i.e., during geological transformation content should be greater than 70%, for natural poz- Table 1. Chemical composition (%) of the cement, pozzolana and limestone employed in experiments Material SiO2 Al2O3 Fe2O3 CaO MgO K2O N2O SO3 Cement 20.5 4.89 4.49 61.41 1.65 0.95 0.22 3.59 Pozzolana 70.61 11.97 0.69 1.95 0.61 4.06 0.0 0.09 Limestone 5.25 1.4 1.2 53.0 0.8 0.05 0.03 0.01 Figure 1. X-ray diffractogram of natural pozzolana. 42 M. IMRAN AHMAD et al.: SUSTAINABLE PRODUCTION OF BLENDED CEMENT… Chem. Ind. Chem. Eng. Q. 22 (1) 41−45 (2016) zolana is satisfied. The mineralogical composition of while total quantity of grinding media was of 96 kg. natural pozzolana is shown in Figure 1. The mineral- Media sizes were 72 (12.56 kg), 63 (21.7 kg), 49 ogical composition as determined by X-ray diffraction (22.06 kg) and 39 mm (10.64 kg). The dimensions of bears similarity with the mineralogical composition of the cylinders were 27 mm, length 37 mm (17.17 kg), a natural pozzolana reported previously [15]. and diameter 25 mm, length 31 mm (11.87 kg). The Pozzolana sample was also tested for loss on feed quantity was 5 kg. The ball mill was drained at ignition using BS–FLS–2011–04 standard. The loss on regular time intervals for sieve analysis using 600, 90 ignition was 1.15%, satisfying the maximum of 10% and 45 μm mesh as well as for Blaine fineness. Insol- specification of ASTM C618. It was concluded based uble residue (IR) was determined by the BS–FLS– on the loss on ignition that natural pozzolana under 20051–04 standard. consideration could be mixed with clinker or cement without any drying through external heat source. RESULTS AND DISCUSSION The formulation of blended cement was varied by substitution of ordinary Portland cement with poz- The chemical composition of ordinary Portland zolana ranging from 5 to 22%, while the limestone cement, pozzolana, and limestone employed in this content was maintained constant at 5%. Ordinary work is shown in Table 1. Portland cement used was from Askari Cement Ltd., It may be observed from Table 1 that the mini- Nizampur, Pakistan, with fineness of 289.3 m2/kg and mum requirement of oxides as per ASTM C618, i.e., residue of 10% on 45 μm. Pozzolana and limestone the sum of silica, alumina, and iron oxides content were separately ground to 370 m2/kg and then mixed should be greater than 70%, for natural pozzolana is with ordinary Portland cement in specified ratios, as satisfied. The compressive strength (MPa) at 7 and shown in Table 2. Mortar cubes were casted and 28 days of various blends is shown in Table 2. tested for compressive strength at 7 and 28 days. Mortar cubes were prepared using 1:3 ratio of cement Table 2. Compressive strength of tested composite cement mortars and sand, taking 200 g of cement and 600 g of sand. Cement Pozzolana Limestone Compressive strength, MPa Cube dimensions were 70.1 mm×70.1 mm×70.1 mm. % % % 7 days 28 days ° Curing of cubes was carried out at 27±2 C water 100 0 0 54.7 61.8 temperature in curing tank until the day of testing. 90 5 5 44.3 58.3 Table 3 presents the composition, loss on ignition, 85 10 5 41.3 52.5 specific surface area, i.e., Blaine and residue of var- 80 15 5 40.0 49.6 ious blends. 73 22 5 37.1 48.3 Strength activity index (SAI) was calculated for all the blends to test for minimum specification of 75% The strength activity index calculated using Eq. as per ASTM C618. The strength activity index is (1) for various blends at 7 and 28 days is shown in defined as [22]: Figure 2. 100A It may be observed from Table 2 and Figure 2 SAI = (1) B that increasing the weight percentage of pozzolana above 10% while maintaining limestone percentage where A = average compressive strength of the fixed at 5% resulted in violation of the ASTM C618 blended cement mortar cubes and B = average com- specification, i.e., below the specified limit of 75%.
Load more

Recommended publications
  • Environmental, Health, and Safety Guidelines for Cement and Lime Manufacturing
    Environmental, Health, and Safety Guidelines CEMENT AND LIME MANUFACTURING WORLD BANK GROUP DRAFT FOR PUBLIC CONSULTATION—AUGUST 2018 Environmental, Health, and Safety Guidelines for Cement and Lime Manufacturing Introduction 1. The Environmental, Health, and Safety (EHS) Guidelines are technical reference documents with general and industry-specific examples of Good International Industry Practice (GIIP).1 When one or more members of the World Bank Group are involved in a project, these EHS Guidelines are applied as required by their respective policies and standards. These industry sector EHS guidelines are designed to be used together with the General EHS Guidelines document, which provides guidance to users on common EHS issues potentially applicable to all industry sectors. For complex projects, use of multiple industry sector guidelines may be necessary. A complete list of industry sector guidelines can be found at www.ifc.org/ehsguidelines. 2. The EHS Guidelines contain the performance levels and measures that are generally considered to be achievable in new facilities by existing technology at reasonable costs. Application of the EHS Guidelines to existing facilities may involve the establishment of site-specific targets, with an appropriate timetable for achieving them. 3. The applicability of the EHS Guidelines should be tailored to the hazards and risks established for each project on the basis of the results of an environmental assessment in which site-specific variables, such as host country context, assimilative capacity of the environment, and other project factors, are taken into account. The applicability of specific technical recommendations should be based on the professional opinion of qualified and experienced persons.
    [Show full text]
  • CBA® Quality/Strength-Enhancing Additive
    PRODUCT DATA SHEET CBA® Quality/strength-enhancing additive Product Description The CBA® series of additives is a new concept in grinding aids - significantly different from any previous GCP product for the cement industry. The difference is that it is a “Grinding Aid Plus”. CBA additives offer all the benefits of traditional grinding aids, such as increased grinding efficiency and cement flowability. In addition, they offer a unique ability to improve cement strengths which might otherwise be deficient due to mechanical, physical or chemical shortcomings. Advantages include either reduced cost of production or increased cement strengths. Physical Properties Product specifications for the most widely used CBA formulations are as follows: Product SG pH CBA 1102 1.06 (±0.01) 7 - 9 CBA 1104 1.07 (±0.01) 8 - 12 CBA 1115 1.10 (±0.01) 6 - 8 Specifications for other CBA formulations not shown above are available through GCP Applied Technologies Field Engineers. • Increased early and long-term compressive strengths for production of better quality cements. Primary Benefit • Reduced cost of cement production through reduced unit grinding The CBA series of additives consists of tailor-made formulations costs and through replacement of clinker with reactive additions to optimise performance and meet specific requirements at each such as pozzolans, blast furnace slag and fly ash or with fillers such plant. as limestone. The use of CBA allows the cement producer to reduce fineness • CBA additives are most effective in enhancing compressive and achieve lower unit power costs without sacrificing strength. strengths of blended cements using up to 40% limestone filler. Compared with conventional grinding aids, CBA offers unit power • When cement particle size is not reduced, the addition of CBA savings of up to 25% with no loss of strength.
    [Show full text]
  • OK™ Cement Mill the Most Energy- Efficient Mill for Cement Grinding
    OK™ cement mill The most energy- efficient mill for cement grinding WE DISCOVER POTENTIAL Quality and profit-improving features Application advantages Design advantages Proven commercially, the OK™ mill is the premier roller mill for The OK mill uses a hydro-pneumatic system to press its grinding finish grinding of Portland cement, slag and blended cements. The rollers against the material bed on the rotating grinding table. mill consistently uses five to ten percent less power than other The patented grooved roller profile has two grinding zones, an cement vertical roller mills, and in comparison with traditional ball inner and an outer. The inner zone prepares the grinding bed by mill operations, the energy requirements for the OK cement mill is compressing the feed material as it moves under the rollers into the 30-45 percent lower for cement grinding and 40-50 percent lower high-pressure grinding zone. The center groove allows air to for slag. The OK mill can contribute significantly to profitability and escape from the material. Grinding pressure is concentrated under competitiveness. the outer zone of the roller, allowing for most efficient operation. Segmented roller wear parts are made of the hardest possible The design combines the drying, grinding, material conveying and material without risk of cracking and are very well suited for hard separation processes into just one unit, thus simplifying the plant facing. Re-positioning of rollers is possible for evening out wear. layout. These features ensure maximum longevity. The OK mill incorporates unique patented design elements in the Operating advantages roller and table profile that improve operating stability and reliability, The rollers are in a lifted position when the mill is started, ensuring giving a typical availability of 90 to 95 percent of scheduled ope- trouble-free start-up.
    [Show full text]
  • Item 421 Hydraulic Cement Concrete
    421 Item 421 Hydraulic Cement Concrete 1. DESCRIPTION Furnish hydraulic cement concrete for concrete pavements, concrete structures, and other concrete construction. 2. MATERIALS Use materials from prequalified sources listed on the Department website. Provide coarse and fine aggregates from sources listed in the Department’s Concrete Rated Source Quality Catalog (CRSQC). Use materials from non-listed sources only when tested and approved by the Engineer before use. Allow 30 calendar days for the Engineer to sample, test, and report results for non-listed sources. Do not combine approved material with unapproved material. 2.1. Cement. Furnish cement conforming to DMS-4600, “Hydraulic Cement.” 2.2. Supplementary Cementing Materials (SCM). Fly Ash. Furnish fly ash, ultra-fine fly ash (UFFA), and modified Class F fly ash (MFFA) conforming to DMS-4610, “Fly Ash.” Slag Cement. Furnish Slag Cement conforming to DMS-4620, “Slag Cement.” Silica Fume. Furnish silica fume conforming to DMS-4630, “Silica Fume.” Metakaolin. Furnish metakaolin conforming to DMS-4635, “Metakaolin.” 2.3. Cementitious Material. Cementitious materials are the cement and supplementary cementing materials used in concrete. 2.4. Chemical Admixtures. Furnish admixtures conforming to DMS-4640, “Chemical Admixtures for Concrete.” 2.5. Water. Furnish mixing and curing water that is free from oils, acids, organic matter, or other deleterious substances. Water from municipal supplies approved by the Texas Department of Health will not require testing. Provide test reports showing compliance with Table 1 before use when using water from other sources. Water that is a blend of concrete wash water and other acceptable water sources, certified by the concrete producer as complying with the requirements of both Table 1 and Table 2, may be used as mix water.
    [Show full text]
  • TDA Cement Additive
    Product Data Sheets TDA ® Quality Improvers A Family of Strength Enhancing Cement Additives Product Description TDA ® Quality Improvers are a family of cement additives that improve the strength or other performance characteristics of cement. They are aqueous compositions of grinding aids with set accelerating, water reducing or strength enhancing compounds, all carefully controlled and accurately blended for constant quality and optimum performance. Product specifications for the most widely used TDA ® formulations are as follows: S.G.S.G. PHPH TDA ® J 1.22 (±0.01) 6 - 8 TDA ® N 1.21 (±0.01) 8 - 10 TDA ® 710 1.34 (±0.02) 8 - 10 TDA ® 770 1.17 (±0.01) 8 - 10 TDA ® 1223 1.15 (±0.05) 6 - 8 TDA ® 7014 1.03 (±0.02) 9 - 12 Product specifications for other TDA ® formulations are available through GCP Field Engineers. Product Advantages One of the key benefits of TDA ® additives is their ability to increase both the grinding efficiency and cement strengths to a degree unequalled by conventional grinding aids. Increased early and long-term compressive strengths for the production of better quality cements. Reduced cost of cement production through reduced unit grinding costs and through replacement of clinker with reactive additions such as pozzolans, blast furnace slag and fly ash, or with fillers such as limestone. The chemical action of TDA ® additives decreases the interparticle attraction between cement grains both in dry form and in water, and increases the rate of hydration of cements. Additional advantages of TDA ® additives include: Page 1 of 5 Product Data Sheets Increased grinding efficiency resulting in increased mill output, higher cement fineness and reduced unit power input and grinding costs.
    [Show full text]
  • The Influence of Triethanol Amine and Ethylene Glycol on the Grindability, Setting and Hydration Characteristics of Portland Cement
    International Journal of Petrochemical Science & Engineering Research Article Open Access The influence of Triethanol amine and ethylene glycol on the grindability, setting and hydration characteristics of Portland cement Abstract Volume 4 Issue 3 - 2019 Triethanol amine and ethylene glycol are used as grinding aids for Ordinary Fayza S Hashem, Eisa E Hekal, M Abd El Portland Cement (OPC). Standard water of consistency, Blaine area, initial and final setting times and compressive strength are tested for OPC. The phase composition Wahab and microstructure of the formed hydrates are tested using DTA/TG and SEM Chemistry Department, Faculty of Science, Ain Shams techniques. Results showed that both the two GAs had a significant improvement in University, Egypt the performance of grinding mills. This is indicating by higher Blaine area when a Correspondence: Fayza S Hashem, Professor, Chemistry dose of 0.03, 0.04 and 0.05wt. % are applied. Beside there are increase in the water Department, Faculty of Science, Ain Shams University, Cairo, demand (greater than 5%) for the all OPC mortar mixes admixed with triethanol amin Egypt, Tel +0020111784595, Email or ethylene glycol at concentrations less than 0.05 wt.%. The improved hydration properties are reflected by an increase in the mechanical properties and microstructure Received: January 24, 2019 | Published: May 02, 2019 of the mortar pastes admixed with the two GAs. This is with attributed to the increase in the cement fineness which leads to the progress in the degree of cement hydration. Keywords: portland cement, triethanol amine, ethylene glycol, water demand, setting time and compressive strength Introduction However its action on cement pastes is very complex and depending on the type of cement and the amount of TEA.1,13‒15 An addition of Grinding aids are mostly organic compounds that are added to 0.02 % of TEA to Portland cement, acts as a set accelerator at 0.25 the clinker in the cement mill.
    [Show full text]
  • Calcium Sulphoaluminate Cement with Mayenite Phase
    (19) TZZ¥_ZZ_T (11) EP 3 199 500 A1 (12) EUROPEAN PATENT APPLICATION (43) Date of publication: (51) Int Cl.: 02.08.2017 Bulletin 2017/31 C04B 7/32 (2006.01) (21) Application number: 17153241.9 (22) Date of filing: 26.01.2017 (84) Designated Contracting States: (72) Inventors: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB • SUCU, MEL KE GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO MERS N (TR) PL PT RO RS SE SI SK SM TR • DEL BA , TU HAN Designated Extension States: MERS N (TR) BA ME Designated Validation States: (74) Representative: Dereligil, Ersin MA MD Destek Patent Inc. Lefkose Cad. NM Ofis Park (30) Priority: 29.01.2016 TR 201601267 B Blok No: 36/5 Besevler Nilüfer 16110 Bursa (TR) (71) Applicant: CIMSA CIMENTO SANAYI VE TICARET ANONIM SIRKETI Mersin (TR) (54) CALCIUM SULPHOALUMINATE CEMENT WITH MAYENITE PHASE (57) The invention is calcium sulphoaluminate ce- waste during aluminium production; soda waste as pulp ment having a dicalcium silicate (C 2S), calcium sulphoa- obtained in soda production facilities remaining after so- luminate - yeelimite (C 4A3S), tetracalcium iron aluminate da ash is removed as product; fly ash obtained from stack (C4AF), calcium sulphate (CS) and mayenite (C12A7) gases as a result of the combustion of pulverized coal in mineral phase structure, and comprises gypsum or phos- thermal power plants; waste bauxite obtained in calcium phogypsum; dross aluminium which is produced as aluminate cement production facilities. EP 3 199 500 A1 Printed by Jouve, 75001 PARIS (FR) EP 3 199 500 A1 Description Technical Field 5 [0001] The present invention relates to cements used in the construction sector.
    [Show full text]
  • Use of Recycled Aggregates for Cement Production
    21 January 2021 SeRaMCo Digital final conference Use of recycled aggregates for cement production André LECOMTE Laury BARNES-DAVIN Cécile DILIBERTO Amor BEN-FRAJ Breffni BOLZE Romain TRAUCHESSEC Nacef TAZI Arnaud DELHAY Hichem KROUR Outline Introduction I. Laboratory experiments II. Industrial production III. Durability Conclusion 2 Introduction Clinker Natural materials Cement raw meal (CRM) Recycled aggregates Firing 3 Introduction SiO 2 Max incorporation rate 10-12% Varies widely (10 à 94)% Recycled aggregates incorporation 12-15% rate1,2 10% 15-20% Impacted by the Silicium-Calcium couple 20-30% 30-50% >50% Depends also on: Cement raw meal • Type of cement plant quarries 94% • Chemical composition of natural materials CaO + Al2O3 + MgO Fe2O3 • Type of clinker/cement produced 10% of calculations ► < 5% Incorporation rate of at least 5% is possible for 73% of calculations ► 10 to 30% 17% of calculations ► > 30% 90% of calculations 1. H. Krour et al, (2020) «Incorporation rate of recycled aggregates in cement raw meals » Construction and Building Materials. 4 2. H. Krour, (2020) «Incorporation des déchets de construction et de démolition dans le cru cimentier » PhD Thesis (in French). I. Laboratory experiments Laboratory synthesis of cement raw meals (CRM) Ref GM1-N CT 40 Compared to reference CRM 30 Reduced burnability (EDTA, %) (EDTA, 20 40 Highest free lime 37 36 35 34 32 Changes on intermediate 31 31 content 28 contenct 10 19 20 21 phases 0 100 Free lime lime Free 1000 °C 1050 °C 1100 °C 1200 °C Ref 60 80 ) GM1-N u.a CT 50 60 40 40 Alum. Fer. (Rietveld, %) (Rietveld, Lower belite ( Intensity Geh.
    [Show full text]
  • Report on the Performance of Portland Limestone Cements in Concrete 20160401
    PERFORMANCES OF LIMESTONE MODIFIED PORTLAND CEMENT AND CONCRETE Luc Courard, University of Liège, Belgium Duncan Herfort, Aalborg Portland A/S, Denmark Yury Villagrán, LEMIT and CONICET, Argentina Corresponding author: Luc Courard – University of Liège, Department of Architecture, Geology, Environment and Constructions, Allée de la Découverte, 9 (Quartier Polytech) – 4000 LIEGE (Belgium), Email: [email protected] 1. Introduction Fine limestone has been added to Portland cement for decades. This is normally achieved by “intergrinding” it with Portland cement clinker in the cement mill. Under normal operating conditions this will result in a surface area of the limestone fraction of between 800 and 1100 m 2/kg (depending on the grindability of the limestone) for a surface area of the clinker fraction of in the region of 400 m 2/kg. Less often the limestone is ground separately and blended with Portland cement. Separate addition of limestone to concrete as a clinker replacement is not widely practiced in conventional concrete, but is used as filler for modifying the rheology of self-compacting concrete. In the early literature limestone was generally regarded as “inert filler”. For this reason it has e.g. become the main constituent in most masonry cements where high levels of replacement of the Portland cement are needed to reproduce the properties of traditional lime mortars. However, for its application in concrete, which is the primary focus of this report, the limestone’s contribution to the hydration reactions can be significant when it is co-ground with the clinker, albeit in relatively small amounts. So much so that it can arguably be classified as an SCM alongside GBFS and fly ash.
    [Show full text]
  • Background Facts and Issues Concerning Cement and Cement Data
    Background Facts and Issues Concerning Cement and Cement Data By Hendrik G. van Oss Open-File Report 2005-1152 U.S. Department of the Interior U.S. Geological Survey ii U.S. Department of the Interior Gale A. Norton, Secretary U.S. Geological Survey P. Patrick Leahy, Acting Director For product and ordering information: World Wide Web: http://www.usgs.gov/pubprod Telephone: 1-888-ASK-USGS For more information on the USGS—the Federal source for science about the Earth, its natural and living resources, natural hazards, and the environment: World Wide Web: http://www.usgs.gov Telephone: 1-888-ASK-USGS Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Although this report is in the public domain, permission must be secured from the individual copyright owners to reproduce any copyrighted material contained within this report. iii Preface This report is divided into two main parts. Part 1 first serves as a general overview or primer on hydraulic (chiefly portland) cement and, to some degree, concrete. Part 2 describes the monthly and annual U.S. Geological Survey (USGS) cement industry canvasses in general terms of their coverage and some of the issues regarding the collection and interpretation of the data therein. The report provides background detail that has not been possible to include in the USGS annual and monthly reports on cement. These periodic publications, however, should be referred to for detailed current data on U.S. production and sales of cement. It is anticipated that the contents of this report may be updated and/or supplemented from time to time.
    [Show full text]
  • Fly Ash As a Soil Amendment in the Northern Red River Valley Amy Decker
    University of North Dakota UND Scholarly Commons Undergraduate Theses and Senior Projects Theses, Dissertations, and Senior Projects 2005 Fly Ash as a Soil Amendment in the Northern Red River Valley Amy Decker Follow this and additional works at: https://commons.und.edu/senior-projects Recommended Citation Decker, Amy, "Fly Ash as a Soil Amendment in the Northern Red River Valley" (2005). Undergraduate Theses and Senior Projects. 86. https://commons.und.edu/senior-projects/86 This Senior Project is brought to you for free and open access by the Theses, Dissertations, and Senior Projects at UND Scholarly Commons. It has been accepted for inclusion in Undergraduate Theses and Senior Projects by an authorized administrator of UND Scholarly Commons. For more information, please contact [email protected]. GEOL . UT2005 • 02952 Decker, Amy SHELVE BY AUTHOR WITH THESES AND DISSERTATIONS! FLY ASH AS A SOIL AMENDMENT IN THE NORTHERN RED RNER VALLEY • A Senior Design Presented to The Department of Geological Engineering In Partial Fulfillment of the Requirements for the Degree Bachelor of Science in Geological Engineering • By Arny Decker May li\ 2005 • EXECUTIVE SUMMARY Combustion of coal occurs worldwide to produce energy for nwnerous residential and industrial processes. During coal combustion, byproducts including fly ash, bottom ash and slag are formed (Lafarge, 2004). By standard regulations, power plants in the United States and many other countries must effectively capture and dispose of these byproducts. Over 118 million tons of combustion byproducts are produced and captured • each year in the United States alone. Disposal of this extraordinary amount of waste is difficult and costly.
    [Show full text]
  • Sources of Mercury, Behavior in Cement Process and Abatement Options
    Sources of mercury, behavior in cement process and abatement options Volker Hoenig European Cement Research Academy Cement Industry Sector Partnership on Mercury Partnership Launch Meeting Geneva, 18/19 June 2013 Agenda 1 Cement production process 2 Behaviour of mercury in Cement Production Process 3 Mercury abatement techniques 4 Monitoring of mercury emissions 5 Mercury emission inventories 6 BestEmissions Available inventories Technique and als Extrapunkt Best Environmental Practice Bedenken 1 Cement production process General principle: • Raw materials: limestone, clay, lime marl • Thermal treatment to produce cement clinker (1450°C) Commonly in rotary cement kilns Regular fuels: black coal, lignite, petroleum coke, natural gas, heavy fuel Alternative fuels: plastics, mixed industrial wastes (RDF), tyres, … 1 Cement production process Exhaust gas utilization • Kiln exhaust gases are mainly used conditioning for drying of raw materials ESP/FF tower • Two modes of operation: raw mill on / raw mill off • Raw mill gas stream determined by required heat ->raw material moisture • Residual kiln exhaust stream preheater bypasses raw mill and is conditioned in evaporating cooler • Example: dry raw materials kiln Less exhaust gas needed for drying raw mill More exhaust gas bypasses raw mill • Ratio raw mill on/off operation mainly determined by ratio raw mill/kiln capacity 1 Cement production process Dust utilization • Prepicipated dust consists mainly of conditioning raw material ESP/FF tower • Raw mill on: „dust“ is ground raw material
    [Show full text]