Concrete is an inevitable building material in construction industry. It is used to provide strength, durability and versatility in structures. Concrete is a mixture of cement, coarse aggregate, fine aggregate and water. Large scale production of cement consumes energy and produce number of unwanted products such as carbon-dioxide, which have negative impact on environment. By considering this negative impacts, construction industries are looking forward for innovative methods to improve the concrete properties without compromising sustainability .According to this theory, additives like fly ash, rice husk ash, ground granulated blast slag (GGBS), alccofine, etc. are tested to replace cement in concrete partially without weakening the material's strength. This paper mainly focuses on investigating the strength characteristics of M20 grade Concrete. Totally 36 specimens were casted, out of which cubes, beams and cylinders were 12 each with 4 different combinations of Cement(C), GGBS(G) and Alccofine (A) (C₁₀₀G₀A₀, C₆₀G₃₄A₆, C₆₀G₃₅A₅, C₆₀G₃₆A₄). The compressive strength, split tensile strength, and flexural strength tests were performed on the cast cubes, cylinders, and beams.