This paper investigates the effects of air-void and binder content on the cracking mechanism of asphalt concrete by using induction heating. Semi-circular bending test was used to evaluate the cracking resistance of induction asphalt mixture, including fracture energy index, crack velocity, crack resistance index, and flexibility index. Compaction energy index was computed to evaluate the influence of the additive agents on the workability of asphalt mixture. Even though the healing level of asphalt mixture recovered up to 80%, cracking resistance declined greatly after one damage-healing treatment. It was observed that air void plays a major role in both healing capacity and cracking resistance, while the impact of asphalt content is milder. Furthermore, analysis results from Matlab® image processing demonstrated that the crack shape of samples was retained after induction healing, the crack area expanded approximately 18% compared to the virgin sample. The analysis also indicates that aggregate crack failure not only causes low healing level but also deteriorates cracking resistance of induction healed sample.

本文通过感应加热研究了气孔和粘结剂含量对沥青混凝土开裂机理的影响。采用半圆弯曲试验来评价感应沥青混合料的抗裂性，包括断裂能指数、裂纹速度、抗裂指数和柔韧性指数。计算压实能指数以评价添加剂对沥青混合料和易性的影响。尽管沥青混合料的愈合水平恢复了80%，但经过一次损伤愈合处理后抗裂性大大下降。据观察，空气空隙在愈合能力和抗裂性方面都起着重要作用，而沥青含量的影响则较小。此外，Matlab® 图像处理的分析结果表明，感应愈合后样品的裂纹形状得以保留，与原始样品相比，裂纹面积扩大了约 18%。分析还表明，骨料裂纹破坏不仅会导致愈合水平低，而且还会降低感应愈合样品的抗裂性。