2013 年 67 巻 1 号 p. 573-578
Every year, tire generated from vehicles that is not biodegradable are increasing, and if it is not managed properly it could bring harm to the environment. Thus, this research was conducted to study the utilization potential of used tire as mortar material. Crumb rubber with size of 1mm - 3mm from waste tire was mixed as fine aggregate at 10％ of sand volume in mortar mixture. In addition, silica fume was added as a binder at 10％ and 15％ of cement weight. Six series of cylindrical rubberized mortar specimen with size of 50mm diameter and 100mm height for compressive strength and 40mm×40mm×160mm prism for flexural strength were prepared. Water to cement ratio was set at 0.35, 0.30 and 0.25 and all series were tested on its fresh properties, compressive strength, flexural strength, hardened density and elastic modulus. Results shows the strength of rubberized mortar without silica fume achieved more than 50％ of control mixture strength and gave a good resistance against brittleness. Meanwhile, addition of 10％ silica fume in the mixture helped to increase the strength. In conclusion, this study strongly suggests the potential of the crumb rubber to be used as sand replacement with or without silica fume.
