Additive to Cement–A Pozzolanic Material-Fly Ash

Fly ash is one of the residue generated by coal combustion and is composed of the fine particles and showing cementitious property. Fly ash as a Pozzolana results in significant enhancement of the basic characteristics of concrete in both fresh and hardened states. This report investigates the effects of the fineness and replacement ratio of fly ash on the temperature rise, setting time, and compressive strength. This report shows that the fineness, has the significant effect on compressive strength of mortar not the chemical composition. The mortars with finer fly ashes gained higher compressive strength than those with the coarser ones. Fly ash is reduce heat of hydration in concrete. It improved impermeability of concrete mass increases resistance against ingress of moisture and harmful gases. Fly ash in cement concrete as a partial replacement of cement as well as an additive so as to provide an environmentally consistent way of its disposal and reuse. Converting released lime from heat of OPC into additional binding material contributing additional strength to concreate mass. Pore refinement due to reaction between fly ash and liberated lime improving impermeability. Role in the rheology, adhesiveness and strength of mortar, and key parameter with the fly ash replace by cement.