The Effect of Crumb Rubber on Asphalt Concrete

Author: Asmaa Abdulmajeed Mamhusseini1
1Civil Engineering Department, Tishk International University, Erbil, Iraq

Abstract: One of the major problems caused by environmental pollution in the world is waste tires (tyres). Millions of waste tires are stockpiling each year in the world. In order to minimize this pollution, a method applied to reuse these waste materials in hot mix asphalt to improve the properties of asphalt concrete. The purpose of this study is to investigate the effects of Crumb Rubber (CR) obtained from the waste tires on the properties of the mixes as an additive. This material (Rubber) which is made from the scrap tyres, usually known as Crumb Rubber, can be used in the asphalt mixture processes either wet process (as binder modifier) or dry process (as a fine aggregate replacement). In both processes (wet and dry), at high temperature rubber particles and bitumen react with each other. Also 50/70 penetration asphalt was modified in this study by mixing with (2,4,6,8 and 10) % of Crumb Rubber by weight of the bitumen using the dry process method. In order to investigate the effects of Crumb Rubber on the physical properties of the bitumen, Ductility, Softening Point, Penetration and Elastic Recovery tests were performed on the bitumen modified with Crumb Rubber. Marshall Design Method was used to determine the optimum bitumen content. The stability value of the specimen with 4 % of Crumb Rubber was found to be the maximum.

Keywords: Crumb Rubber, Asphalt Mixture, Dry Process, Waste Tires

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doi: 10.23918/eajse.v6i2p53


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