Strength properties of fibre-reinforced self-consolidating concrete with foundry waste sand

Abstract

— This study presents a comprehensive overview of replacing natural river sand (FA) with foundry waste sand (FWS) in fibre-reinforced high strength self-consolidating concrete (SCC). Fine aggregate (FA) was replaced with FWS, proportions varying from 0% to 70%. To maintain workability in the SCC mix, chemical admixtures were added. During fresh state, properties of SCC like filling and passing ability, segregation resistance were studied. Assessment results indicated a moderate reduction in workability, slump flow decreased by 4% over control mix, for 70% replacement of FA with FWS. SCC mixes were prepared with different FWS contents and evaluated for density, modulus of elasticity, compressive, flexural and split tensile strengths. The compressive strength increased by 6% to 8%, flexural strength by 2% to 4% and split tensile strength by 2% to 3% when the FA was partially replaced by 20% with FWS. Density of SCC increased by 6.5% and modulus of elasticity decreased by 10% for 70% replacement of FA with FWS. From the assessment outcome, it can be resolved that FWS could form a dependable alternative source for natural river sand replacement in high strength SCC.