Abstract
South Africa, like many other countries is witnessing the fast growth of the construction industry. Concrete is one of the key materials used for the development of infrastructures. Sand as one of the natural resources and major concrete components is depleting universally. At the same time, the solid waste generated from industries is gaining momentum and increasing drastically. Researchers have indicated that Waste Foundry Sand (WFS) has the potential properties for use as fine aggregate in concrete. The full/partial replacement of sand in concrete with WFS not only makes concrete manufacturing economical, but also helps in reducing disposal problems and promote sustainable construction. In this study, the physical and chemical properties of five WFS’s from Gauteng, South Africa were analysed (two green and three chemically bonded moulding sands). The samples were investigated with a view to determine their conformity with applicable engineering standards when used as fine aggregate. The physical and chemical properties evaluated were particle gradation, specific gravity, moisture content, clay contents, bulk density, XRF and pH. The physical and chemical results of the five WFS’s analysed indicate acceptable variations in chemically bonded moulding sand. The green sands proved unacceptable for use as fine aggregate for concrete use due to their: clay contents, poor grading which cannot be blended with other sand, and due to the presence of fine and silt particles which can cause bleeding and segregation.