Abstract Concrete is the most preferable and widely used construction material in the infrastructure development. For concreting and curing huge amount of potable water is required and it is difficult to get this at all places and all times. One of the best alternative solution for this problem is using the self curing concrete. In this experimental study the mechanical properties of hardened concrete by partial replacement of cement by 0, 40 an 60% of GGBS for M20 and M35 grades of concrete using 0.5 and 1 percent of Poly ethylene glycol as self curing agent. Cubes and cylinders are cast and tested at age of 7 and 28 days, for compressive strength and split tensile strength. The results of conventional concrete are compared with the results of concrete with GGBS and Polyethylene glycol 400 for both grades of concrete. The test results have revealed that addition of 0.5% of self curing agent show higher strengths for 60% replacement of cement with GGBS while 1.0% of self curing agent showed good results for 40% replacement for M20 grade of concrete.