Xiang Hao, Yang Desheng, Peng Shunxian, Gao Wei
College of Civil Engineering and Architecture, Southwest University of Science and Technology, Mianyang 621010, China.
National & Local Joint Engineering Research Center of Transportation and Civil Engineering Materials, Chongqing Jiaotong University, Chongqing 400074, China.
Materials (Basel). 2025 Apr 10;18(8):1732. doi: 10.3390/ma18081732.
This investigation aimed to assess the influence of warm-mix additives on the performance characteristics of recycled asphalt mixtures. Pressure-aging vessels were employed to simulate the aging of asphalt binders. Warm-mix recycled asphalt (WMRA) and mixtures were prepared by incorporating self-developed plant-oil-based rejuvenators and surfactant-based warm-mix additives. The rheological properties of asphalt were tested by a dynamic shear rheometer (DSR). Furthermore, the pavement performance of the asphalt mixture was evaluated by a rutting test, beam bending test, Marshall stability test, and freeze-thaw splitting test. The experimental results demonstrated that the addition of warm-mix additives reduces the penetration and softening point of recycled asphalt while enhancing its ductility. Performance improvement was quantitatively evaluated using a recovery index. The complex modulus and rutting factor of the WMRA were found to be lower than those of recycled asphalt, indicating a decrease in the asphalt's resistance to deformation owing to the surfactant. Both the hot-mix and warm-mix recycled asphalt mixtures met the specified requirements for various performance indicators. The warm-mix rejuvenator outperformed the regular rejuvenator in evaluating water stability using the soaked Marshall residual stability method, whereas the evaluation based on the freeze-thaw splitting strength ratio demonstrated the opposite trend.
本研究旨在评估温拌添加剂对再生沥青混合料性能特性的影响。采用压力老化容器模拟沥青结合料的老化。通过掺入自主研发的植物油基再生剂和表面活性剂基温拌添加剂制备温拌再生沥青（WMRA）及其混合料。采用动态剪切流变仪（DSR）测试沥青的流变性能。此外，通过车辙试验、梁弯曲试验、马歇尔稳定度试验和冻融劈裂试验对沥青混合料的路面性能进行评价。试验结果表明，温拌添加剂的加入降低了再生沥青的针入度和软化点，同时提高了其延度。使用恢复指数对性能改善进行了定量评估。发现WMRA的复数模量和车辙因子低于再生沥青，表明由于表面活性剂的作用，沥青的抗变形能力有所下降。热拌再生沥青混合料和温拌再生沥青混合料均满足各项性能指标的规定要求。在采用浸水马歇尔残留稳定度法评价水稳定性时，温拌再生剂的性能优于常规再生剂，而基于冻融劈裂强度比的评价结果则显示出相反的趋势。
