Study on Partial Replacement of Fine Aggregate by Quarry Rock Dust in High Volume Flyash Concrete

Fly ash is one of the residues generated from thermal power plants. Fly Ash can be used as a low cost mineral admixture in concrete. The addition of fly ash in cement resulted in great benefits such as reduction in heat of hydration, resistance to corrosion, reduction of cement consumption and decreased permeability. M 25 grade of concrete is prepared with high volume fly ash in concrete with various proportions as a partial replacement of cement 0%, 10%, 20%, 30%, 40%, 50% of opc and quarry rock dust is used as partial replacement of fine aggregates 0%, 10%, 20%, 30%, 40%, 50% by river sand. To study the Mechanical properties of high volume fly ash concrete and fine aggregate replaced concrete compressive strength, split tensile strength and flexural strength at different ages of concrete such as 7, 28, 56 days are studied. The result shows that the optimum replacement of fly ash and quarry rock dust are at 30%.