ABSTRACT

As a high-efficiency non-contact heating technology, induction heating has shown great application prospect in melting snow and de-icing of asphalt pavement and induced self-healing of damage of asphalt mixture. In this research, 4 lengths of steel fiber and three fiber contents were adopted. The effect of different lengths and contents of steel fiber on the performances, including optimum asphalt content, high-temperature rutting resistance, low-temperature cracking resistance, freeze–thaw cycles resistance and thermal conductivity (TC), of asphalt mixture were studied in detail. Moreover, the induction heating rates (HRs) of asphalt mixture with different lengths and contents have also been investigated. Finally, the overall performances of asphalt mixture with different lengths of fiber were compared and analysed based on the radar chart method. The results show that when the length is 7 mm and the content is 4% of steel fiber, the optimum asphalt content, TC and HR of asphalt mixture were significantly improved. When the length is 5 mm and the content is 4% of steel fiber, the high-temperature rutting resistance, low-temperature cracking resistance and freeze–thaw cycles resistance were also significantly improved. The radar chart shows that the overall performances of asphalt mixture with 5 mm steel fiber are the best one.

摘要

感应加热作为一种高效的非接触加热技术，在沥青路面融雪除冰和沥青混合料损伤的诱导自愈方面显示出巨大的应用前景。在这项研究中，采用了 4 种长度的钢纤维和三种纤维含量。详细研究了钢纤维的不同长度和含量对沥青混合料的最佳沥青含量、抗高温车辙性能、抗低温开裂性能、抗冻融循环性能和导热系数（TC）等性能的影响。 . 此外，还研究了不同长度和含量的沥青混合料的感应加热速率（HRs）。最后，基于雷达图法对不同纤维长度沥青混合料的综合性能进行了对比分析。结果表明，当长度为7 mm、钢纤维含量为4%时，沥青混合料的最佳沥青含量、TC和HR均得到显着提高。当长度为5 mm，钢纤维含量为4%时，抗高温车辙性能、抗低温开裂性能和抗冻融循环性能也有显着提高。雷达图显示，5mm钢纤维沥青混合料的综合性能最好。耐低温开裂性和抗冻融循环性也显着提高。雷达图显示，5mm钢纤维沥青混合料的综合性能最好。耐低温开裂性和抗冻融循环性也显着提高。雷达图显示，5mm钢纤维沥青混合料的综合性能最好。