Utilization of steel slag aggregate in hot mix asphalt in Egypt

Abstract

Steel slag is a byproduct from either the conversion of iron to steel in a basic oxygen furnace, or the melting of scrap to make steel in an electric arc furnace. This paper presents the influences of the utilization of steel slag as a coarse aggregate replacing the traditional limestone aggregate on the properties of a binder and surface course hot mix asphalt (HMA). Six percentages (0%, 20%, 40%, 60%, 80%, and 100%) of limestone aggregate were replaced by steel slag aggregate (SSA) for both binder and surface course. The effectiveness of SSA in HMA was measured by preparing Marshall Specimens and measure their stability, flow, stiffness, indirect tensile stress, and loss of stability. It was observed that replacing up to 60% of limestone coarse aggregate by SSA improved the mechanical properties of the mixtures and it was the optimal percentage.