Ground granulated blast furnace slag (GGBS) was used in this study to replace Portland cement and also investigate the effect of glass powder (GP) on the behaviour of mechanical and durability properties of concrete as a partial replacement in cement. Cement can be used as a mortar to bind large stones or bricks. When sand and stones are added to cement, the aggregate is called concrete. The mechanical properties were examined by the tests of compressive strength, flexural strength, bond strength and split tensile strength. Durability behaviour was carried out by water absorption and sorptivity. 3/8 Replacement of cement by glass powder was from 5% to 45% in step of 5% and the GGBS with range of replacement from 45% to 5% in step of 5% respectively.