Moderate Lightweight Concrete Mixed with Recycled Crumb Rubber

Abstract

This study provided the test results on the mechanical and physical properties oflightweight concrete obtained by replacing portions of the conventional fine aggregate withcrumb rubber from recycling waste tires. The mechanical properties were compressive andflexural strength. The physical properties were unit-weight, permeable voids, thermalconductivity and sound absorption. Results indicated that the unit-weight of crumb rubberconcrete was lower than that of plain concrete. The decrease was found to be proportionalwith the crumb rubber content. In addition to the decrease in unit-weight, the crumb rubberconcrete also exhibited better sound and thermal properties. However, due to the low strengthand stiffness of rubber, the mechanical properties of crumb rubber concrete appeared to belower than that of plain concrete.