In controlled laboratory experiments, the use of foundry sand as fine aggregate in concrete was investigated. Lab investigations were done. It was a component of a larger investigation. Different concrete mixtures required varying quantities of reclaimed foundry sand. This substituted for powdered aggregates. 0 % (combination of the control) to 10 %, 20 %, 30 %, and 40 %. The concentration of the control mixture was 0 %. The workability, compressive strength, and flexural strength of concrete mixtures were tested and analysed. 30 % recycled foundry sand increased the compressive strength of the control mixture by over 35 %. The result of comparing them was this conclusion. The majority of industrial detritus used to produce cement and concrete for construction has been included. Included are cement and concrete. Recently, many of these byproducts have been acknowledged. Used foundry sand, a byproduct of the foundry industry, may be substituted for fine aggregates in the construction industry. Recent research supports this conclusion. Constantly on the lookout for new waste-reduction strategies, construction companies are constantly innovating. This is as a result of the construction industry's ongoing pursuit of sustainable methods. As a partial replacement for concrete, this study utilised M20 grade concrete and ancient foundry sand in varying concentrations. Comparing the results of these experiments. The results were compared to a standard concrete mixture used as a control.