Comparative investigation on the influence of spent foundry sand as partial replacement of fine aggregates on the properties of two grades of concrete

摘要

An experimental program was carried out to study the influence of spent foundry sand (SFS) as partial replacement for fine aggregates (natural sand) on two grades of concrete mixtures. Two control concrete mixtures (M20 & M30) were designed to have 28-day compressive strength of 30 MPa and 40 MPa. Then, fine aggregate (natural sand) was replaced with five percentages (0%, 5%, 10%, 15%, 20%) of SFS by weight. Comparative performance of both types of concrete (M20 & M30) was investigated by measuring compressive strength, splitting tensile strength, modulus of elasticity, chloride permeability, and ultra sonic pulse velocity up to the age of 365 days.