Liu Wei, Wu Shaopeng, Liu Quantao, Wang Jiazhu, Wan Pei, Xu Haiqin, Jiang Qi
State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430070, China.
Advanced Engineering Technology Research Institute of Zhongshan City, Wuhan University of Technology, Zhongshan 528400, China.
Materials (Basel). 2024 Apr 26;17(9):2040. doi: 10.3390/ma17092040.
Induction healing technology can effectively repair microcracks in asphalt mixtures and is a promising maintenance technology for asphalt pavements. However, it requires the addition of steel wool fibers to asphalt mixtures and cannot be directly used to repair existing pavements. In order to improve the practicality of the induction healing technology, this article designs a wearing course asphalt mixture with induction healing function that is going to be paved above the existing road surface. The AC-10 asphalt wearing course for induction heating was prepared by adding steel fiber (SF). Analysis of the overall temperature of the surface revealed the unevenness of the temperature distribution, and the healing properties were investigated through protective heating that controlled the maximum temperature of the upper surface. The results show that the addition of SF can improve the high-temperature stability, low-temperature and intermediate-temperature crack resistance, and moisture stability of asphalt wearing courses; however, it has adverse effects on volumetric performance and skid resistance. The heating temperature increases with the increase in SF content, but higher maximum temperature heating rate causes worse heating uniformity and lower healing effect. The maximum heating rate of the sample with 10% SF reaches 3.92 °C/s, while its heating rate at minimum temperature is similar to that of the sample with 6% SF, which is only 0.7 °C/s, indicating the worst heating uniformity. The best healing effect occurs when the maximum temperature of the upper surface reaches 160 °C. The recommended optimal SF content is 6% of the asphalt volume. The asphalt mixture with 6% SF has an appropriate volume performance, moisture stability, and skid resistance; additionally, it has the best high-temperature stability, as well as low-temperature and intermediate-temperature crack resistance. Meanwhile, it also has uniform temperature distribution and efficient healing efficiency.
感应修复技术能够有效修复沥青混合料中的微裂缝，是一种很有前景的沥青路面养护技术。然而，它需要在沥青混合料中添加钢纤维，无法直接用于修复现有路面。为了提高感应修复技术的实用性，本文设计了一种具有感应修复功能的磨耗层沥青混合料，将其铺设在现有路面之上。通过添加钢纤维（SF）制备了用于感应加热的AC-10沥青磨耗层。对表面整体温度的分析揭示了温度分布的不均匀性，并通过控制上表面最高温度的防护加热来研究愈合性能。结果表明，添加SF可以提高沥青磨耗层的高温稳定性、低温和中温抗裂性以及水稳定性；然而，它对体积性能和抗滑性有不利影响。加热温度随SF含量的增加而升高，但较高的最高温度加热速率会导致加热均匀性变差和愈合效果降低。含10%SF的样品的最大加热速率达到3.92℃/s，而其最低温度下的加热速率与含6%SF的样品相似，仅为0.7℃/s，表明加热均匀性最差。当上表面最高温度达到160℃时，愈合效果最佳。推荐的最佳SF含量为沥青体积的6%。含6%SF的沥青混合料具有合适的体积性能、水稳定性和抗滑性；此外，它具有最佳的高温稳定性以及低温和中温抗裂性。同时，它还具有均匀的温度分布和高效的愈合效率。
