Microwave Heating Healing of Asphalt Mixture with Coal Gangue Powder and Basalt Aggregate

Bin Zhang, Xu Gao, Shi Xu (), Xinkui Yang, Qin Tian and Jiayi Liu
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Bin Zhang: School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan 430070, China
Xu Gao: School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan 430070, China
Shi Xu: School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan 430070, China
Xinkui Yang: State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430070, China
Qin Tian: School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan 430070, China
Jiayi Liu: School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China

Sustainability, 2023, vol. 15, issue 17, 1-15

Abstract: Microwave heating is an effective method to achieve autonomic crack healing in asphalt mixtures, and the use of microwave-absorbing materials can largely improve this healing efficiency. As a solid waste, coal gangue contains metal oxides, which shows the possibility of microwave heating. In order to further promote the application of coal gangue in the microwave healing of asphalt mixtures, this study looks into the synergistic effect of basalt and coal gangue powder (CGP) on the microwave heating self-healing of an asphalt mixture. The mechanical performance, water stability, low-temperature crack resistance and microwave healing efficiency of the asphalt mixture were investigated using the immersion Marshall test, standard Marshall test, Cantabro test and semi-circular bending (SCB), and healing tests, respectively. The results indicated that the addition of CGP in asphalt mixture can improve the microwave heating speed, which also showed a significant advantage in water stability and fracture energy recovery. The research results will further promote the utilization rate of coal gangue.

Keywords: self-healing asphalt; coal gangue powder; basalt; microwave healing; pavement performance; healing efficiency (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2023
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