A series of experiments were conducted on two grades of concrete namely M25 and M40 with three nominal replacement ratios of 0%, 25% and 50% using recycled concrete aggregates (RCA). The RCA concrete was obtained using a new mix design in which the residual mortar content of the recycled aggregates was considered as a part of sand in the new concrete. For the six mixes, tests were conducted to determine the engineering properties of the RCA concrete and the results were compared to that of the natural aggregate concrete. A total of 72 specimens were cast and tested. The tests conducted included Slump, Non-destructive testing, Compressive strength, Splitting tensile strength and Elastic modulus. Based on the investigations it was found out that the proposed method gave comparable results to that of the concrete made of natural aggregates. Compressive strength, UPV, Rebound Hammer and Elastic modulus values were established to be more than that of the natural aggregate concrete while Slump and Splitting tensile strength were lesser