1) The study investigates using rice husk ash, fly ash, and quarry dust as partial replacements for standard sand in concrete mixtures. 2) The research aims to determine the performance of concrete with varying proportions of rice husk ash and fly ash, ranging from 30% fly ash and 0% rice husk ash up to 15% of each. 3) Numerous tests will be performed on the concrete mixtures including compressive strength, flexural strength, split tensile strength, and workability.