碳化硅粉填充沥青混合料微波自愈合性能及合理掺量

doi:10.11896/cldb.23080070

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Abstract The traditional asphalt mixture has poor microwave absorption performance, which limits the application of microwave maintenance technology in pavement engineering. In this work, in order to enhance the microwave absorption capacity, silicon carbide powder with stable physicochemical properties is cited as a substitute for mineral powder filler incorporated into asphalt mixtures, accelerating the macroscopic crack healing of mixtures under microwave heating. AC-13 asphalt mixes with different silicon carbide equal volume replacement of mineral powder (0%, 10%, 20%, 30%, 40%, 50%, 60%) were designed. The optimum asphalt content of the different types of mixtures were determined and tested for their road performance. The microwave self-healing capability of asphalt mixtures was evaluated by fracture-healing-fracture test and microwave hea-ting test based on the peak fracture force recovery rate as a healing index. Gray correlation analysis was used to propose a reasonable replacement doping of silicon carbide. The results show that the microscopic properties of fillers and asphalt mastics have significant influence on the macroscopic properties of asphalt mixtures. The incorporation of silicon carbide powder can enhance the mechanical properties and high temperature stability of asphalt mixtures, and shows a parabolic trend with the increase of silicon carbide replacement ratio. However, it has an unfavo-rable effect on the water stability of asphalt mixtures. As the silicon carbide replacement ratio increases, the warming rate and healing index also increase, and the optimal microwave heating time exists for asphalt mixtures with different silicon carbide replacement ratios. The microwave absorber is incorporated into the asphalt mixture in the form of filler, which makes the wave-absorbing warming more uniform. Gray correlation analysis shows that the reasonable replacement ratio of silicon carbide powder filled asphalt mixtures is 30% to 40%.

Key words： road engineering asphalt mixture microwave heating self-healing road performance heating mechanism

Published: 25 October 2024 Online: 2024-11-05

CLC number:

U414

Fund:National Natural Science Foundation of China (52168062).

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	TANG Jie
	ZHAO Hua
	GAO Hongcheng

Cite this article:

TANG Jie,ZHAO Hua,GAO Hongcheng. Microwave Self-healing Properties and Reasonable Content of Silicon Carbide Powder Filled Asphalt Mixtures[J]. Materials Reports, 2024, 38(20): 23080070-10.

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http://www.mater-rep.com/EN/10.11896/cldb.23080070 OR http://www.mater-rep.com/EN/Y2024/V38/I20/23080070

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