Mechanical Properties of Concrete Using Crumb Waste Tire Rubber as Fine Aggregate

Abstract

This research used crumb waste tire rubber recycles as fine aggregate replacement in the concrete mixture. Most particles of the crumb waste tire rubbers are smaller than sieve number 4 and bigger than sieve number 16 and used as the acceptable aggregate replacement at the ratio of 2, 5, 7.5, and 10% by weight. The properties of fresh concrete and mechanical properties in terms of compressive strength of concrete at 7, 14, and 28 days were investigated. Moreover, the elastic modulus and splitting tensile strength of concrete were also investigated at 28 days. According to the experiment results, it can be seen that the concrete mixed with crumb waste tire rubber exhibits different physical properties as compared with control concrete. The slump of fresh concrete was reduced with an increase in waste tire rubber replacement. For the mechanical properties, it was found that increasing the amount of waste tire rubber reduced the compressive strength and elastic modulus of concrete. The result shows that the concrete replaced with 2% crumb waste tire rubber provided the highest compressive strength, which could develop compressive strength up to 382 kg/cm² at 28 days or up to 89% of control concrete. For the splitting tensile strength of the concrete, all concretes replaced with crumb waste tire rubber had a tensile strength approximately 10% of the compressive strength, similar to standard concrete.