The thermal degradation of styrene-butadiene rubber (SBR) polymer during asphalt mixture preparation processes severely compromises the modifying effects of polymer on binder low-temperature performance. Sasobit/epoxidized soybean oil (Sasobit/ESO) compound has been demonstrated to be a promising warm-mix additive that can alleviate the negative short-term thermal aging influences on SBR modified asphalt binder (SBRMA) without compromising the original performance of binder itself. Nevertheless, there are few studies concerning the further investigation of in-service performance and long-term aging resistance of SBRMA modified by Sasobit/ESO compound. For wide application of this novel warm-mix additive, this study aims to investigate the influences of Sasobit/ESO on rheological performance and long-term aging resistance of SBRMA. The effects of this novel warm-mix additive on performance grade (PG) and aging resistances of SBRMA were assessed by dynamic shear rheometer (DSR), bending beam rheometer (BBR) or Fourier transform infrared spectroscopy (FTIR) tests. Meanwhile, the modifying mechanism of novel warm-mix additive was also explored from the perspective of chemical properties. The results indicate that Sasobit/ESO only makes a physical modification effect on SBRMA. Additionally, a decrease of 20 °C in preparation temperature was presented by warm-mix asphalt mixture in comparison with hot-mix mixture. The intermediate- and high-temperature PG of SBRMA were increased by two levels after the introduction of Sasobit/ESO whether in consideration of its warm-mix effect or not. Both short- and long-term aging resistances of SBRMA were improved with the introduction of Sasobit/ESO. More concretely, the short-term aging resistance of SBRMA was especially improved in consideration of its warm-mix effect, while the improved effect on long-term aging resistance was not further enhanced even if the warm-mix effect was accounted.

在沥青混合料制备过程中丁苯橡胶 (SBR) 聚合物的热降解严重损害了聚合物对粘合剂低温性能的改性作用。Sasobit/环氧化大豆油 (Sasobit/ESO) 复合物已被证明是一种很有前途的温拌添加剂，可以减轻对 SBR 改性沥青粘合剂 (SBRMA) 的短期热老化的负面影响，而不会影响粘合剂本身的原始性能。然而，关于Sasobit/ESO复合改性SBRMA的服役性能和长期抗老化性能的进一步研究很少。为了广泛应用这种新型温混添加剂，本研究旨在研究 Sasobit/ESO 对 SBRMA 流变性能和长期抗老化性能的影响。通过动态剪切流变仪 (DSR)、弯曲梁流变仪 (BBR) 或傅里叶变换红外光谱 (FTIR) 测试评估了这种新型温混添加剂对 SBRMA 性能等级 (PG) 和耐老化性的影响。同时，还从化学性质的角度探讨了新型温拌添加剂的改性机理。结果表明 Sasobit/ESO 仅对 SBRMA 产生物理修饰作用。此外，与热拌混合料相比，温拌沥青混合料的制备温度降低了 20 °C。引入 Sasobit/ESO 后，无论是否考虑其温混效应，SBRMA 的中高温 PG 均提高了两个水平。随着 Sasobit/ESO 的引入，SBRMA 的短期和长期耐老化性均得到改善。更具体地说，考虑到SBRMA的温拌效应，SBRMA的短期抗老化性能得到了特别的提高，而即使考虑了温拌效应，其长期抗老化的改善效果也没有进一步增强。