ABSTRACT

Thermoreversible aging is an important factor that affects the durability of asphalt pavement in cold and high altitude areas. Although there has been increasing attention to the significance of thermoreversible aging in recent years, the contribution of asphalt components to thermoreversible aging remains unclear in the existing literature. To this end, potential components that may affect the thermoreversible aging of asphalt binders were regarded as additives in this study. The extended bending beam rheological test (ExBBR), thermal stress calculation, and modulated differential scanning calorimetry (MDSC) analysis were employed to study the effects of two kinds of crystalline waxes with different carbon atoms and one asphaltene type as additives on the thermoreversible aging properties of asphalt binder. The findings showed that under conventional 1-hr conditioning cold storage, adding 1% or 3% C₂₀H₄₂ significantly improved the low-temperature rheological properties and reduced base asphalt's thermal stresses. However, no significant effect of the C₂₀H₄₂ additive on thermal stress reduction was observed when considering the asphalt binder's thermoreversible aging. Both low-temperature rheological tests and thermal analysis confirmed that C₂₀H₄₂ significantly increased thermoreversible aging in the base binder; however, C₃₂H₆₆ and asphaltene additives did not produce a similar effect.

摘要

热可逆老化是影响寒冷高海拔地区沥青路面耐久性的重要因素。尽管近年来人们越来越关注热可逆老化的重要性，但现有文献中沥青组分对热可逆老化的贡献仍不清楚。为此，本研究中将可能影响沥青粘合剂热可逆老化的潜在成分视为添加剂。采用延伸弯曲梁流变测试 (ExBBR)、热应力计算和调制差示扫描量热法 (MDSC) 分析，研究了两种不同碳原子的结晶蜡和一种沥青质类型作为添加剂对热可逆老化性能的影响。的沥青粘合剂。₂₀ H ₄₂显着改善了低温流变性能并降低了基层沥青的热应力。然而，在考虑沥青粘合剂的热可逆老化时，没有观察到 C ₂₀ H _{42添加剂对降低热应力的显着影响。}低温流变测试和热分析都证实，C ₂₀ H ₄₂显着增加了基础粘合剂的热可逆老化；然而，C ₃₂ H ₆₆和沥青质添加剂没有产生类似的效果。