Home >>
ABSTRACT
This research aims to determine the possibility of using "crumb rubber" as a partial replacement of fine aggregate (sand) in 1:2.75 cement sand mortar and to find the effect on compressive strength, workability, water absorption and density of mortar. Different % of crumb rubber (0%, 5%, 10%, 15%, 20%, 25% and 30%) were replaced to the mortar mixes. A 0.5 water-cement ratio was used to form the mortar mixes. Workability results show a decrease in workability as the % replacement by crumb rubber increases. Furthermore, the test for compressive strength showed an increase in compressive strength for mortar up to 5% replacement by crumb rubber; then, the strength decreases with the further increase of crumb rubber replacement. The compressive strength at 28days for 5% replacement by crumb rubber was found to be 9.47N/mm2, which is greater than the strength of the control mortar, 8.33N/mm2. The water absorption test also showed a reduction of water absorbed at 5%, and it then pounces back and continues to increase as the % replacement by crumb rubber increases. Therefore, it can be concluded that the optimum use of Crumb rubber as a partial replacement for fine aggregate can be made up to 5%. The research also showed that crumb rubber could be used to reduce the water absorption rate and improve the compressive strength of mortar.
Keywords: Crumb rubber, Partial replacement, Fine aggregate, Mortar
Full Text
