This investigation employed an interrupted torsion fatigue test using the linear amplitude sweep procedure to assess the intrinsic self-healing potential of unaged, aged, rejuvenated, and re-aged asphalt binders. Continuous oscillatory shear strain loading at different damage levels were interrupted with a single rest period of different durations. An index based on the decrease in crack length following the rest period (H_a) has been defined to accurately reflect the occurrence of healing. The results indicate that H_a is higher at lower damage levels and for longer rest-period durations. The amount of irreversible crack growth increased with an increase in crack propagation and aging level. H_a also reflects both the short- and long-term effectiveness of employing a rejuvenator to ameliorate the fracture healing potential of the aged binder. Once the healing indices were established for each fracture damage-rest period, a healing master curve was constructed to provide a complete representation of this phenomenon. It was observed that the effect of aging and rejuvenation was more pronounced at lower reduced rest periods, corresponding to higher fracture damage levels. The area beneath the healing master curves in the selected reduced rest period (H) was considered as a cohesive healing indicator of asphalt binder. Furthermore, H_a was compared with the commonly used healing index (IH) in the viscoelastic continuum damage model for capturing the occurrence of damage recovery immediately after the rest period. It was found that for the binders in the unaged state IH underestimated the healing potential.

本研究采用了使用线性振幅扫描程序的间断扭转疲劳试验来评估未老化、老化、再生和重新老化的沥青结合料的内在自愈潜力。不同损伤水平下的连续振荡剪切应变载荷被不同持续时间的单个休息期中断。已经定义了基于休息期 ( H _a )后裂纹长度减少的指数，以准确反映愈合的发生。结果表明，H _a在较低的损伤水平和较长的休息期持续时间较高。不可逆裂纹扩展量随着裂纹扩展和时效水平的增加而增加。^ h_一还反映了使用再生剂改善老化粘合剂的骨折愈合潜力的短期和长期有效性。一旦为每个骨折损伤休息期建立了愈合指数，就会构建愈合主曲线以提供这种现象的完整表示。据观察，老化和恢复活力的效果在减少休息时间越短的情况下越明显，对应于较高的骨折损伤水平。在选定的减少休息时间 ( H ) 中，愈合主曲线下方的面积被认为是沥青粘合剂的内聚愈合指标。此外，将H _a与常用的愈合指数（IH) 在粘弹性连续介质损伤模型中，用于捕捉静止期后立即发生的损伤恢复。发现对于未老化状态的粘合剂，IH低估了愈合潜力。