Pollution Research Paper

Vol.32, Issue 03, 2013; Page No.(477-482 )

SELF COMPACTING CONCRETE USING FLY ASH OF THERMAL POWER PLANTS

A. GOPALAN1 AND K. JAGADEESAN

Abstract

Fly ash is one of the residues generated in combustion and comprises the fine particles that rise with the flue gases. In the past, fly ash produced from coal combustion was simply entrained in flue gases and dispersed into the atmosphere. This created environmental and health concerns that prompted laws which have reduced fly ash emissions to less than 1% of ash produced. The use of fly ash as concrete admixture not only extends technical advantages to the properties of concrete but also contributes to the environmental pollution control. In India alone, we produce about 75 million tons of fly ash per year, the disposal of which has become a serious environmental problem. Therefore, the effective utilisation of fly ash in making concrete is attracting serious considerations of field engineers. This paper outlines the study of materials, methods, mix proportion, workability tests and mechanical properties of Self Compacting Concrete (SCC). SCC is a special type of concrete having more powder content containing cement, fly ash, aggregates apart from chemical admixtures. Super plasticizer and Viscosity Modifying Agent (VMA) are used to impart filling ability, passing ability and resistance to segregation. In this system, the coarse aggregate and fine aggregate contents are fixed and self-compactibility is to be achieved by adjusting the water/powder ratio and super plasticizer dosage. The cube compressive strength, cylinder compressive strength, split tensile strength, flexural strength were determined adopting conventional testing procedure. The present study indicates that self compacting concrete can be produced with the above mentioned waste material of thermal power plant and this concrete will be helpful to place the concrete in congested reinforcement area

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