Amirkabir University of Technology Amirkabir Journal of Civil Engineering 2588-297X 55 10 2023 12 22 Laboratory Optimization and Environmental Assessment of Rubber Concrete Using Simultaneous Incorporation of Rubber Powder and Rubber Fibers Laboratory Optimization and Environmental Assessment of Rubber Concrete Using Simultaneous Incorporation of Rubber Powder and Rubber Fibers 2043 2064 5254 10.22060/ceej.2023.21625.7779 FA Peyman Kordrostami Department of civil Engineering , Kish International Branch, Islamic Azad University, Kish island, Iran Babak Aminnejad 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 Alireza Lork Department of Civil Engineering, Safadasht Branch, Islamic Azad University, Safadasht , Iran Mehdi Dehestani Structural and Earthquake,Department of Civil Engineering, Babol Noshirvani University of Technology،iran Journal Article 2022 07 25 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. 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. https://ceej.aut.ac.ir/article_5254_5d0d5594d24f0f955548f0fc0ff83d10.pdf