Liu Tao, Duan Weidang, Zhang Jialin, Li Qiuping, Xu Jian, Wang Jie, Qin Yongchun, Chang Rong
Jiangxi Provincial Communications Investment Group Co., Ltd., Nanchang 330025, China.
Research Institute of Highway, Ministry of Transport, Beijing 100088, China.
Polymers (Basel). 2022 Sep 1;14(17):3623. doi: 10.3390/polym14173623.
To evaluate the effects of the source and admixture of aged asphalt on the rheological properties of reclaimed asphalt binders, the relative viscosity (Δ), relative rutting factor (ΔG*/sinδ), and relative fatigue factor (ΔG*sinδ) were selected as evaluation indicators based on the Strategic Highway Research Program (SHRP) tests to characterize the rheological properties of a reclaimed asphalt binder under medium- and high-temperature conditions. The results of the study showed that the viscosity, rutting factor, and fatigue factor of the reclaimed asphalt binder increased with the addition of aged asphalt; however, the effect of the source and admixture of aged asphalt could not be assessed. The relative viscosity, relative rutting factor, and relative fatigue factor are sensitive to the source, admixture, temperature, and aging conditions, which shows the superiority of these indicators. Moreover, the relative viscosity and relative rutting factor decreased linearly with increasing temperature under high-temperature conditions, while the relative fatigue factor increased linearly with increasing temperature under medium-temperature conditions. In addition, the linear trends of the three indicators were independent of the source and admixture of aged asphalt. These results indicate that the evaluation method used in this study can be used to assess the effects of virgin asphalt and aged asphalt on the rheological properties of reclaimed asphalt binders, and has the potential for application. The viscosity of recycled asphalt increases, and the rutting factor and fatigue factor both increase. The high-temperature stability of reclaimed asphalt is improved, and the fatigue crack resistance is weakened.
为评估老化沥青的来源和掺配比例对再生沥青结合料流变性能的影响，基于战略公路研究计划（SHRP）试验，选择相对粘度（Δ）、相对车辙因子（ΔG*/sinδ）和相对疲劳因子（ΔG*sinδ）作为评价指标，以表征再生沥青结合料在中高温条件下的流变性能。研究结果表明，随着老化沥青的添加，再生沥青结合料的粘度、车辙因子和疲劳因子均增加；然而，老化沥青的来源和掺配比例的影响无法评估。相对粘度、相对车辙因子和相对疲劳因子对老化沥青的来源、掺配比例、温度和老化条件敏感，这显示了这些指标的优越性。此外，在高温条件下，相对粘度和相对车辙因子随温度升高呈线性下降，而在中温条件下，相对疲劳因子随温度升高呈线性增加。另外，这三个指标的线性趋势与老化沥青的来源和掺配比例无关。这些结果表明，本研究中使用的评价方法可用于评估新沥青和老化沥青对再生沥青结合料流变性能的影响，具有应用潜力。再生沥青的粘度增加，车辙因子和疲劳因子均增大。再生沥青的高温稳定性提高，抗疲劳开裂能力减弱。
