Graphene oxide (GO) with 0.2, 0.5, and 1.0 wt% loading was used to modify warm-mix epoxy asphalt binders (WEABs). The thermal stability, structure of GO, rotational viscosity-curing time performance, dynamic moduli, glass transitions, damping ability, mechanical performance, and phase-separated morphology of GO/epoxy asphalt composites were investigated in the laboratory. GO significantly enhanced the thermal stability of the pure WEAB. X-ray scattering analysis revealed that GO layers were delaminated in the epoxy asphalt binder. GO accelerated the cure reaction of the pure WEAB and thus resulted in higher rotational viscosity of GO/epoxy asphalt composites. Furthermore, the viscosity of the modified WEABs slightly increased in the GO content. GO increased the dynamic moduli and T_gs of both epoxy and asphalt for the pure WEAB. However, the damping ability of GO/epoxy asphalt composites was similar to that of the pure WEAB. Confocal microscopy observations revealed that GO was dispersed in both asphalt and epoxy phases of the phase-separated WEAB. The asphalt domains in the continuous epoxy phase became more spherical and uniform with the existence of GO. Moreover, the dispersion of epoxy in the discontinuous asphalt phase became more evident. The mechanical properties of the pure WEAB were greatly improved with the addition of GO. The tensile toughness and strength of the pure WEAB increased by 31% and 33%, respectively, with the addition of 0.2 wt% GO.

中文翻译：

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氧化石墨烯/环氧沥青复合材料的粘度-固化时间行为、粘弹性和相分离

负载量为 0.2、0.5 和 1.0 wt% 的氧化石墨烯 (GO) 用于改性温拌环氧沥青粘合剂 (WEAB)。实验室研究了GO/环氧沥青复合材料的热稳定性、GO结构、旋转粘度-固化时间性能、动态模量、玻璃化转变、阻尼能力、力学性能和相分离形貌。GO显着增强了纯WEAB的热稳定性。X 射线散射分析表明 GO 层在环氧沥青粘合剂中分层。GO 加速了纯 WEAB 的固化反应，从而导致 GO/环氧沥青复合材料的旋转粘度更高。此外，改性 WEAB 的粘度在 GO 含量中略有增加。_GO增加了动态模量和Tg纯 WEAB 的环氧树脂和沥青的 s。然而，GO/环氧沥青复合材料的阻尼能力与纯 WEAB 相似。共聚焦显微镜观察表明，GO 分散在相分离 WEAB 的沥青和环氧树脂相中。随着 GO 的存在，连续环氧树脂相中的沥青域变得更加球形和均匀。此外，环氧树脂在不连续沥青相中的分散变得更加明显。加入 GO 后，纯 WEAB 的力学性能得到了极大的改善。添加 0.2 wt% GO 后，纯 WEAB 的拉伸韧性和强度分别提高了 31% 和 33%。