Research on Induction Heating Activated Self-healing of Cracks in Dense Graded Asphalt Mixture

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China Journal of Highway and Transport ›› 2017, Vol. 30 ›› Issue (1) : 17-24.

HE Liang^1,2,3, ZHAO Long¹, LING Tian-qing¹, MA Yu¹, LIU Quan-tao⁴

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In order to provide a reference for the electromagnetic induction self-healing technology of asphalt pavement, steel wool was added into dense graded asphalt concrete to make it suitable for induction heating and the induction heating activated self-healing potential of cracks in the mixture was investigated. The heating rate of the induction heating specimens was investigated through the induction heating experiments on the asphalts mixtures with different types and contents of steel wool, and experiments on self-healing ability of crack and pavement performance of the mixtures were carried out. The comprehensive optimum design was conducted on mixture. The results show that the asphalt mastic rather than stone is heated with induction heating, and energy is transferred from asphalt cement to aggregate with short heating time and low energy consumption. The heating temperature should be no more than 100℃, otherwise the swelling problem will occur in the mastic. The average induction heating speed of the mixture increases with the increasing length and content of steel wool. The dense graded asphalt concrete containing 4% steel wool type 2^# with length of 6.5 mm shows a maximum crack healing rate of 96.7% when the top surface of the specimen is heated to 90℃, while it also has a high crack healing rate of 95.4% when the top surface of the specimen is heated to 75℃. In this case, a great amount of energy is saved and the swelling of the mastic is avoided. The asphalt concrete containing 2% steel wool type 2^# with length of 3.5 mm has the best pavement performance. Combining pavement performance analysis with induction self-healing ability analysis for mixture, the asphalt concrete containing 4% steel wool type 2^# with length of 3.5 mm not only has excellent pavement performance and favorable energy consumption, but also shows an ideal crack healing rate of 94.6% when its top surface is heated to 75℃.

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pavement engineering / dense graded asphalt mixture / experimental research / self-healing of crack / induction heating / steel wool

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HE Liang, ZHAO Long, LING Tian-qing, MA Yu, LIU Quan-tao. Research on Induction Heating Activated Self-healing of Cracks in Dense Graded Asphalt Mixture[J]. China Journal of Highway and Transport, 2017, 30(1): 17-24

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2015-12-15	2017-01-20
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2017-02-15

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