UTILIZATION OF RECYCLED CRUMB RUBBER IN STRUCTURAL SELF-CONSOLIDATING CONCRETE

摘要

The present work evaluates the impact of using recycled crumb rubber (CR) as a partial replacement of fine aggregate on the fresh and mechanical properties of concrete composite, especially when self-consolidating concrete is used. In this study, seven mixtures containing various amounts of fine CR (0-30% by volume of sand) were tested. The fresh properties tests included flowability, passing ability, and segregation resistance. On the other hand, the mechanical properties tests included compressive strength, modulus of elasticity, splitting tensile strength, and flexural strength. The results indicated that although increasing the CR replacement decreased the fresh and mechanical properties of concrete, all the developed mixtures achieved adequate fresh and mechanical properties required for structural applications. The rigidity of concrete composite was also decreased effectively, exhibiting more ductile failure behaviour at ultimate loadings. In addition, using recycled rubber as a partial replacement for fine aggregate promotes the development of eco-friendly concrete with a reduced self-weight, which is receiving greater attention nowadays.