vi.Fly ash

Fly ash is a cementitious supplementary material for concrete production concrete and a byproduct of the pulverized coal in electric power generating plants. And also, a material of fine-grained having alumina, silica, iron, and calcium as a major content and sulfur, sodium, magnesium, carbon, and potassium as a miner percentage and it will serve as a cement replacement by weight up to 15%.
