For Private Circulation TECHNICAL MAGAZINE For Private Circulation Madras Cements Ltd Vol. II No.1 “Auras Corporate Centre” I Floor, 98A, Dr. Radhakrishnan Road, Mylapore, Contents Chennai - 600 004 Phone : 044-28478666, 28477582 Chairman’s Message 03 Email : [email protected] Engineers Day Editorial Committee Good Concrete Practices 04 Advisory Board International Workshop on Sustainability Mr. A.V. Dharmakrishnan and Advances in Concrete Technology Mr. Balaji K. Moorthy ( SACT 2012) – NIT Calicut 05 Honoary Chairperson Performance of Blended Cement Concrete Subjected to Elevated Temperatures 06 Dr. Bhanumathi Das Interaction with Engineers & Participation Editor in Exhibition 19 Er Anil Kumar Pillai Readers Feedback on TECHMANTRA 20 Members Er Srinivasa Rao Projects associated with RAMCO DryMix 21 Er Shashank Sharma Er Suraj Projects Associated With RAMCO Cement 22 Er Muthu Ganesh Er Sreenidh MACE Division 24 Er Bilal Er Arindam Acharya Er Venkatesh Pulavarty Er Vishnu Narayanan Namboothiry Er Farish Designer : G Devaraj 9840 559 153 Printing: Sun Graphics Chairman’s Message Dear Friends Greetings from Ramco ! Customer Delight is one of our Mantras and we, at Ramco, leave no stone unturned to ensure that our products and services exceed the quality standards and expectations of our customers. We are well aware that in today’s scenario, the customer has diverse requirements and myriad options. We, therefore, are well aware that we cannot remain complacent with our offerings. That is the reason, we constantly interact with our customers - to study and understand and fi ne tune our offerings to their changing needs. We are well aware that one of the biggest challenges that you construction professionals face is to ensure quality workmanship at construction sites. In order to support you, we have ramped up the activity of our MACE division comprising of qualifi ed civil engineers. Our MACE division engineers constantly visit construction sites and conduct demonstrations and trials and help masons and site engineers in making durable concrete. The response from construction professionals has been very positive and we are in the process of strengthening our MACE team. We sincerely hope that this activity of ours will help in reducing some of your burden and concerns. You are well aware that our commitment to environment and sustainable development is total. It was our privilege to extend our support for the International Workshop on Sustainability and Advances in Concrete Technology held at NIT – Kozhikode . I am happy to note that experts and academicians from across the globe have presented papers on the usage of alternative supplementary cementitious materials to be used in concrete. I am sure this will go a long way in creating better awareness to the need for sustainable development. Let me also take this opportunity to wish you all a happy Engineers Day which falls on September 15th . I am sure that this day would be an opportunity for all construction professionals to get together and deliberate on various challenges which face us in building a more durable and stronger India. With my best wishes P R Ramasubrahmaneya Rajha Chairman & MD 04 TECH MANTRA Engineers Day 2012 Madras Cements Ltd wishes every Engineer a Happy Engineers Day . About Engineers day : Engineers day is celebrated every year in India on September 15th to commemorate the birthday of the legendary Engineer Sir M. Visvesaraya ( 1861-1962) . He was also a scholar , statesman and the Diwan of Mysore during 1912 to 1919 . He is recognized for his works in harnessing water resources which lead to the design and construction of several river dams , bridges and implementation of drinking water schemes all over India . Some of his most successful projects include the design and construction of K.R . Sagar dam and its adjoining Brindavan Gardens , turn around of the Bhadravathi Iron and Steel Works setting up of the Mysore Sandalwood Oil factory and the founding of the Bank of Mysore. Good Concrete Practices – Guidelines Compaction : Adequate compaction without segregation should be ensured by providing suitable workability and by employing appropriate placing and compacting equipment and procedures . Full compaction is particularly important in the vicinity of construction and movement joints and of embedded water bars and reinforcement Finishing Practices: Good fi nishing practices are essential for durable concrete Overworking the surface and addition of water /cement to aid in fi nishing should be avoided ; the resulting laittance will have impaired strength and durability and will be particularly vulnerable to freezing and thawing under wet conditions. Curing : It is essential to use proper and adequate curing techniques to reduce the permeability of the concrete and enhance its durability by extending the hydration of the cement , particularly in its surface zone. Concrete in sea water : Concrete in sea water or exposed directly along the sea coast shall be atleast M20 Grade in case of plain concrete and M30 in case of reinforced concrete . The use of slag or pozzolona cement is advantageous under such conditions. Form removal : Forms shall not be released until the concrete has achieved a strength of atleast twice the stress to which the concrete may be subjected at the time of removal of formwork . The strength referred to shall be that of concrete using the same cement and aggregates and admixture , if any , with the same proportions and cured under conditions of temperature and moisture similar to those existing on the work . Dosage of Chemical Admixtures: Dosage of retarders , plasticisers and superplasticisers shall be restricted to 0.5, 1.0 and 2.0 percent respectively by weight of cementitious materials and unless a higher value is agreed upon between the manufacturer and the constructor based on performance test. Supervision during Concreting : It is exceedingly diffi cult and costly to alter concrete once placed . Hence , constant and strict supervision of all the items of construction is necessary during the progress of work , including the proportioning and mixing of the concrete . Supervision is also of extreme importance to check the reinforcement and its placing before being covered. - Compiled from IS 456 : 2000 – PLAIN AND REINFORCED CONCRETE – CODE OF PRACTICE 05 TECH MANTRA International Workshop on Sustainability and Advances in Concrete Technology ( SACT 2012) – NIT Calicut Madras Cements Ltd was associated as a sponsor during the International Concrete Workshop held at National Institute of Calicut from 7-8th May 2012 . Technical Services team of Madras Cements with delegates of “ International Workshop on sustainability and advances in Concrete Technology ( SACT 2012) ” at NIT – Kozhikode Few of the major papers presented during the workshop were as follows : Sustainability Issues and Concrete Technology: Dr V.M.Malhotra, President of Supplementary Cementing Materials for Sustainable Development Inc. Ottawa, Canada A New look at Fiber Reinforced Concrete as a sustainable Material: Prof V.Ramakrishnan, Distinguished Professor Emeritus South Dakota School of Mines and Technology, USA Lightweight Concrete and Sustainability Issues: Dr. Theodore W. Bremner Professor Emeritus, Department of Civil Engineering, University of New Brunswick, Canada Concrete with High Volume of supplementary Cementing Materials and Admixtures for Sustainable and Productive Construction: Dr Harold Justnes Chief Scientist, SINTEF, Trondheim, Norway The Indo Norwegian initiative on sustainable utilization of alternative materials in cement and concrete – Potential for increased use: Mr Christian Jon Engelson, Senior Scientist, SINTEF, Trondheim, Norway C02 – Emission – Tripple Focus: Mr Per Jahren Consultant, Oslo, Norway Recent Progress of Chinese Cement Industry on Energy Saving and Emission Reduction : Dr SUI Tongbo, Professor, Academy Member, China Building materials Academy Beijing, China High Performance Concrete – For More Sustainable Construction Dr Per Fidjestol Global Technical Marketing manager, Elkem, Norway Studies on GeoPolymer Concrete : Dr B. Vijaya Rangan, Emeritus Professor Curtin University of Technology, Perth, Australia Retrofi tting of Structures Using Ferrocement Laminates: Dr P.Paramasivam Professorial Fellow, National University of Singapore 06 TECH MANTRA Performance of Blended Cement Concrete Subjected to Elevated Temperatures Subhash C. Yaragal 1, K S Babu Narayan 2, Sushanth Nayak 3 , Shoaib Mohammed 4 , Shrihari K Naik 5, Ahamad Farid S 6, and Darshan Patel 7 1,2 Associate Professors, 3,4,5,6 UG Students, 7 PG Student, Department of Civil Engineering, National Institute of Technology, Karnataka, Surathkal, PO Srinivasnagar – 575025, Karnataka State, INDIA . email: [email protected] Abstract: Concrete is a popular building material due to its special property of mouldability to any shape. With a huge volume of production of concrete worldwide, manufacture of Ordinary Portland Cement (OPC) is responsible for fi ve percent of global carbon dioxide emissions every year. There is wide scope for reducing use of OPC by adopting environmental friendly substitutes like Ground Granulated Blast Furnace Slag (GGBS), Fly Ash and Silica Fume etc. This paper discusses the effect of replacement of OPC with different percentages (10%, 20%, 30%, 40% and 50%) of GGBS, on the compressive and split tensile strength of 100 mm cubes subjected to elevated temperatures of 200 0 C, 400 0 C, 600 0 C and 800 0 C. The retention period for all