Laboratory Optimization and Environmental Assessment of Rubber Concrete Using Simultaneous Incorporation of Rubber Powder and Rubber Fibers

Document Type : Research Article

Authors

1 Department of civil Engineering , Kish International Branch, Islamic Azad University, Kish island, Iran

2 Department of civil Engineering , Roudehen Branch, Islamic Azad University, Roudehen , Iran and Department of civil Engineering , Kish International Branch, Islamic Azad University, Kish island, Iran

3 Department of Civil Engineering, Safadasht Branch, Islamic Azad University, Safadasht , Iran

4 Structural and Earthquake,Department of Civil Engineering, Babol Noshirvani University of Technology،iran

Abstract

Annually, thousands of tons of rubber tires are produced, consumed, and discarded within the country. In recent decades, researchers have investigated the use of rubber fibers or rubber crumbs in concrete and their effects on its mechanical properties. However, the simultaneous utilization of both these materials as substitutes for sand and gravel in concrete has not been thoroughly explored. In this research, this research gap is addressed by examining the results of slump tests on rubber concrete specimens with water-to-cement ratios of 0.45, 0.50, and 0.55, incorporating rubber crumb and rubber fibers up to 25%. The test results indicate a reduction in compressive strength with increasing rubber content. By using different water-to-cement ratios, various rubber concrete proportions, and the SIMAPro software, it was determined that the combination of rubber crumb and rubber fibers leads to approximately a 40% reduction in carbon dioxide emissions in the environment. The optimal condition for all ratios is achieved by adding 4% rubber crumb and rubber fibers.

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