Sand mining is a current problem faced by the construction industry in the present day. Hence there is a need to identify suitable alternatives to natural river sand as fine aggregate in concrete to cater the future demand of fine aggregate. Foundry sand, a waste product obtained from metal foundry is identified as a potential replacement to river sand. The present investigations are focused on fly ash concrete mixes incorporating foundry, M sand as a fine aggregate. In this study, the strength and durability properties with incorporating of cement with fly ash and silica fume with different levels of replacement (0%, 10%, 15%, 20%, 25%, and 30%) of river sand with foundry sand and M-sand are evaluated. The present study will address the disposal related problem of fly ash and foundry sand, thus reducing environmental hazards and also will lead to the conservation of natural fine aggregate for future.