Abstract
The fly ash is widely used as cement supplementary cementitious material in concrete. Initially fly ash was used in the ranges of 15% to 25% by mass of the cementitious material component in concrete. The recent research studies have shown that concrete with good strength and durability properties can be made with using high volumes of fly ash. The utilization of fly ash is helps in reducing the greenhouse gas emissions as well as in lowering the cost of final product without compromising its properties Fly ash comprises of amorphous alumino-silicate particles. When fly ash is used in concrete as supplementary cementitious material, the amorphous alumino-silicate reacts with calcium hydroxide, the cement hydration product and forms calcium silicate hydrate. The optimum quantity of fly ash to be used in concrete as supplementary cementitious material depends on various factors. This chapter deliberate the properties of fly ash that has major influence on hydration mechanism and use of low to high volume of fly ash in concrete without compromising the construction process and the quality of the concrete.
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