Natural aggregates are becoming scarce and their production and shipments are also becoming more difficult. The main objective of this study is to identify an alternative source of good quality aggregates which are depleting very fast rate due to the fast pace of construction activities in India and to improve the workability and durability of concrete. The use of steel slag as a waste industrial which is the by-Product of iron and steel production provides a great opportunity to utilize it as an alternative to normally available coarse aggregates. In this study concrete of M20 grade for a w/c ratio of 0.45 respectively for the replacement of 25%,50%, and 75% of coarse aggregates by steel slag which is produced as waste material in the steel industry and has a negative impact on the environment when disposed of. The investigation reveals that the steel slag could be utilized as coarse aggregate in all concrete applications and shows a considerable improvement in the compressive strength of concrete over the control mixes by 7 to 8%. Results show that the concrete incorporating steel slag has higher compressive strength and an increase in density and stability was clearly observed in the specimens replaced with steel slag as coarse aggregate.