Fly ash: It is a byproduct resulting from the combustion of coal to generate electricity. Fly ash is usually replaced by a percentage of Portland cement in concrete to obtain good strength and durability. The properties of fly ash suitable for use in cement can be used for concrete construction. Research in various places around the world has found that concrete in which cement was replaced with fly ash, cement-free concrete provided exceptional performance in short- and long-term concrete strength and workability relative to the use of ordinary Portland cement concrete.