Concrete is a widely used material in construction. Due to technological advancement, the concrete have been developed to enhance the properties of concrete. Now a day’s various studies have been conducted to make concrete with waste materials with the intension of reducing cost and demand of materials. This paper investigates the mechanical properties of concrete using Ground Granulated Blast furnace Slag (GGBS) and Marble Dust (MD) as a partial replacement of cement and fine aggregate respectively. Based on previous literature survey, 40% of GGBS and 10, 20 and 30% of MD are taken for the present study. The present research work is aimed at studying the mechanical properties of M20 grade concrete using GGBS and MD. Compressive strength and Split tensile strength were carried out for 7, 28 and 56 days and flexural strength will be taken from optimum percentage of replacement. Marginal increases in the strength were observed for concrete specimens admixed with GGBS and MD when compared with conventional concrete.