ABSTRACT Cement, sand and aggregate are basic requirements for any construction industry. Sand is a substance used in mortering and concrete preparation that plays a significant role in the design of a blend. There is a shortage of river sand now a days erosion of rivers and environmental problems. The lack of or scarcity of sand from river would impact the construction industry and the latest substitute material must therefore be sought to replace river sand in order to avoid excess river erosion and environmental damage.Many scientists consider various sand-related materials and Mersey silt is one of the most important materials. The required concrete mixture can be obtained by using different proportions of this silt along with sand. This paper provides a study of the various amounts of Mersey silt in the preparation of concrete as a partial substitute for natural sand. This study emphasize on compression and split tensile strength aspect on concrete with Mersey silt as partial replacement (10%, 15% and 20%) for natural sand using M30 grade concrete. Keywords: Mersey, Silt, Fine Aggregate, Concrete.