Abstract
In order to evaluate the influence of rock asphalt on the self-healing behavior of asphalt mastics, this study carried out the frequency sweep test, fatigue-healing test and complete process monitoring test of self-healing behavior for four different asphalt mastics. In addition, this study examined a proposed mechanism of self-healing from literatures. The results show that the optimum self-healing temperature of control asphalt mastic is identified as its near-Newtonian fluid transition temperature (slightly higher than softening point), while the optimum self-healing temperature of rock asphalt mastic is lower than its near-Newtonian fluid transition temperature and softening point, which indicates that rock asphalt mastic maximizes its self-healing potential before the near-Newtonian fluid state. This study models the self-healing behavior of the asphalt mastic considering the effect of healing temperature and time to verify the applicability of the capillary diffusion theory that explains the self-healing in asphalt mastics. The proposed model determined the rest times for full healing of asphalt mastics, and results indicate that the self-healing rate of asphalt mastic can be significantly increased by rock asphalt. The results of the self-healing behavior monitoring test and the parameters obtained from the proposed model both indicate that rock asphalt has some adverse effects on the self-healing behavior in the initial stage, but will promote the development of self-healing after a period of time. Overall, the addition of rock asphalt can improve the self-healing properties of asphalt mastic. Based on the aforementioned macroscopic results and the capillary diffusion theory, it can be concluded that the addition of rock asphalt negatively affects the wetting mechanism of self-healing, but positively influences the strength and efficiency of diffusive cohesive healing, thus effectively enhancing the self-healing behavior of asphalt mastic.
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