Although fly ash as a partial replacement for cement has been utilized for many years, it has been almost exclusively used in low-volume percentages, such as 10 or 20% cement replacement. In this study partial replacement of Natural sand with Crushed stone waste for M 15 grade of concrete. The compressive strength of concrete of OPC concrete and with natural sand and Crushed stone waste is compared and it has been found that the strength of concrete got increased.