This paper presents results of an experimental research project into the effect of using pulverised copper slag (CS) as partial replacement for ordinary Portland cement (OPC). Cement was replaced in the following proportions; 2.5, 5, 10 and 15% compared to the control (0%) specimen. Test performed included X-ray diffraction (XRD) and X-ray Fluorescence (XRF) respectively for mineralogical and chemical oxide composition. The compressive and flexural strength developments of samples concrete were determined for up to 90 days of water curing. Oxygen permeability, water sorptivity and chloride conductivity tests were performed to assess the long term durability performances.