Performance Evaluation of Asphalt Mixtures Containing Reclaimed Asphalt Pavement (RAP) Modified with Waste Polybutadiene Rubber

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Document Type : Research Article

Authors

1 Dept. of Civil Eng., Faculty of Civil Engineering and Architecture, Malayer University, Malayer, Iran

2 Department of Civil and Environmental Engineering, Shiraz University of Technology, Shiraz. Iran

Abstract

In this research, the effect of waste polybutadiene rubber (PBR) has been investigated in the performance evaluation of asphalt mixtures containing RAP. Different percentages of RAP, including 20, 30, and 50%, were selected to prepare the asphalt mixture. To prepare polymer modified bitumen, bitumen 60/70 was mixed with 5% by weight of waste PBR polymer and then added to asphalt mixtures containing different percentages of RAP. In this study, four-point bending beam, modified Lottman and Hamburg Wheel-Track tests were performed to evaluate the fatigue behavior, moisture susceptibility and the rutting resistance of asphalt mixtures containing RAP, respectively. The results showed that the presence of utilized waste polymer improved significantly the fatigue behavior of asphalt mixtures containing 20 and 30% RAP compared to the control mixture. Also, the use of this polymer can be used in asphalt mixtures with a RAP percentage of less than 50% (about 40%) without any concern of reducing the fatigue resistance of asphalt. Furthermore, the results showed that by using waste PBR in asphalt mixtures containing RAP, the resistance of the mixtures against moisture susceptibility has increased significantly compared to the control mixture. The results of the Hamburg Wheel-track test also showed that the combination of RAP materials and used waste polymer could reduce the rut depth by 70% in comparison with the control mixture.

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Amirkabir Journal of Civil Engineering

Articles in Press, Accepted Manuscript
Available Online from 29 December 2024

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