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Abstract
Fly ash or coal ash has been partly used to replace cement in concrete industry for a long period because it contributes beneficial properties to concrete. It improves the workability, durability and chemical resistance of concrete. Despite these benefits, the use of fly ash is limited due to the low early strength of fly ash concrete. To eliminate this problem studies have been conducted on accelerating the pozzolanic properties of fly ash. The pozzolanic property of fly ash can be improved by various types of activations namely, thermal activation, mechanical activation and chemical activation. Thermal activation by heating and mechanical activation by grinding requires costly equipment and energy Compared to these chemical activation is cheap and easy. Many researchers have carried out studies on microstructural development of strength with chemical activation. Calcium oxide and sodium silicate are used in 1:8 ratio for activating fly ash in the project study.The main objective of the thesis is to study the strength behavior of beams using chemically activated fly ash at various cement replacement of 40%, 50% and 60% with water binder ratio 0.45.The results are compared with ordinary cement concrete and activated fly ash concrete.