Asphalt binders are known to exhibit an inherent ability to repair damage. Such self-healing potentially affects the fatigue damage performance of bituminous materials. There are contradicting findings about the effects of aging and polymer modification on healing. The effectiveness of rejuvenating agents also has not been sufficiently addressed. In the present study, three healing indices have been defined to provide a more complete representation with which to quantify the healing potential of binders. These indices have been defined using damage characteristic curves derived from interrupted linear amplitude sweep tests. Initial healing (IH) describes the immediate reduction in the damage accumulated after the rest period. Residual healing (RH) shows the lasting effect of healing and total healing (TH) is a combination of IH and RH. The results demonstrate that IH does not present a complete picture of healing, particularly at low and intermediate levels of damage. While, RH better exhibits the detrimental effect of aging, the healing ability of SBS (styrene–butadiene–styrene) binder at higher damage levels, and the positive effect of the use of the rejuvenating agent. The healing model shows that, irrespective of the healing index and binder, the effect of loading interruptions at higher levels of damage, along with increased stiffness because of aging, prevail over the positive effects of an increase in the duration of the rest period.

已知沥青粘合剂具有修复损伤的固有能力。这种自我修复可能会影响沥青材料的疲劳损伤性能。关于老化和聚合物改性对愈合的影响存在相互矛盾的发现。再生剂的有效性也没有得到充分解决。在本研究中，定义了三个愈合指数，以提供更完整的表示来量化粘合剂的愈合潜力。这些指数是使用从断续线性幅度扫描测试中得出的损伤特性曲线定义的。初始愈合 (IH) 描述了在休息期后累积的伤害立即减少。残余愈合 (RH) 显示愈合的持久效果，而总愈合 (TH) 是 IH 和 RH 的组合。结果表明，IH 并未呈现完整的愈合图景，尤其是在低和中等损伤水平下。同时，RH 更好地表现出老化的不利影响，SBS（苯乙烯-丁二烯-苯乙烯）粘合剂在较高损伤水平下的愈合能力，以及使用再生剂的积极作用。愈合模型表明，无论愈合指数和粘合剂如何，在较高损伤水平下加载中断的影响，以及由于老化导致的刚度增加，都超过了休息期持续时间增加的积极影响。SBS（苯乙烯-丁二烯-苯乙烯）粘合剂在较高损伤水平下的愈合能力，以及使用再生剂的积极作用。愈合模型表明，无论愈合指数和粘合剂如何，在较高损伤水平下加载中断的影响，以及由于老化导致的刚度增加，都超过了休息期持续时间增加的积极影响。SBS（苯乙烯-丁二烯-苯乙烯）粘合剂在较高损伤水平下的愈合能力，以及使用再生剂的积极作用。愈合模型表明，无论愈合指数和粘合剂如何，在较高损伤水平下加载中断的影响，以及由于老化导致的刚度增加，都超过了休息期持续时间增加的积极影响。