Study on the Self-healing Behavior of Silicon Carbide Asphalt Mastic and Determination of the Optimal Dosage
ZHAO Hua1,2,*, TANG Jie1,3, LIU Weinan1
1 School of Infrastructure and Engineering, Nanchang University, Nanchang 330031, China 2 Jiangxi Transportation Research Institute Co., Ltd., Nanchang 330052, China 3 School of Transportation Science and Engineering, Harbin Institute of Technology, Harbin 150090, China
Abstract: Self-healing technology has great advantages in prolonging the service life of asphalt pavement. Understanding the development of the self-healing behavior of bituminous material and enhancingits self-healing capacity are the prerequisite for its application in engineering. Microwave heating is an effective method for accelerating the healing of cracks in wave-absorbing asphalt materials. In this work, silicon carbide was used as the absorbing material to prepare self-healing asphalt mastic with filler-bitumen ratio of 0.9, which can improve the absorbing property and road performance of asphalt mastic. The effects of silicon carbide on rheological, mechanical and self-healing properties of asphalt were analyzed microscopically, and the heating behavior under microwave irradiation. The results show that the initial temperature of self-healing, the optimum temperature of self-healing and the elastic modulus of asphalt mastic show a ‘bimodal curve’ with the increase of silicon carbide replacement ratio. The reason for this is the change in particle gradation of the silicon carbide - limestone powder composite filler, which forms a different interfacial structure resulting in a change in the properties of the asphalt mastic. Based on the above parameters, the optimal volume replacement ratio of 40% is proposed. In addition, microwave test also shows that the optimal replacement dosage is 40vol%. Under the filler-bitumen ratio of 0.9, considering the road performance and self-healing property, the optimal replacement dosage of silicon is 40vol%. The results can provide theoretical reference for the development and design of silicon carbide absorbing asphalt material.
赵华, 唐杰, 刘伟男. 碳化硅沥青胶浆自愈合行为研究及最佳掺量的确定[J]. 材料导报, 2024, 38(14): 23040058-12.
ZHAO Hua, TANG Jie, LIU Weinan. Study on the Self-healing Behavior of Silicon Carbide Asphalt Mastic and Determination of the Optimal Dosage. Materials Reports, 2024, 38(14): 23040058-12.
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2024, Vol. 38 
