Alkalinity and strength properties of concrete containing macro silica and ground granulated blast furnace slag

As the industrial by-products are continually increasing, and no strategic waste management scheme is put in place in developing communities, an effective solution is being sort through the use of industrial rejects in concrete production. This study evaluates the alkalinity and strength properties of concrete containing macro silica and ground granulated blast furnace slag (GGBS). Varying proportions of GGBS and macro silica were used as partial replacement of Ordinary Portland Cement (OPC) and river sand in concrete respectively, while other materials including granite and water content were kept constant. It was observed that the alkalinity of concrete is not affected by the modification of materials in the concrete as performed in this study. Higher 28 days strength properties, comparable to the reference concrete, was achieved when 10% macro silica and 50% GGBS were used as partial replacement of sand and OPC, respectively.