反应性弹性体三元共聚物改性沥青及其混合料性能与机制1_郝培文.pdfVIP

DOI ： 10.13801/ki.fhclxb002 反应性弹性体三元共聚物改性沥青及其混合料 性能与机制1 郝培文*，常睿，刘红瑛，曹晓娟 （长安大学 道路结构与材料交通行业重点实验室，西安，710064） 摘 要：采用黏度试验和动态剪切流变试验研究了反应性弹性体三元共聚物 (RET)对基质沥青与 SBS 改性沥青性能的影响， 通过原子力显微镜分析了 SBS 改性沥青、RET 复配 SBS 改性沥青的表面形貌特征，并采用车辙试验、低温弯曲试验、弯曲 疲劳试验以及加速加载试验评价了 RET 改性沥青混合料的各项技术性能，最后通过 weibull 分布，分析了不同 RET 改性沥 青混合料在不同失效概率下的疲劳性能。结果表明：RET 的掺入提高了沥青的黏度和抗车辙因子，对沥青的高温性能有较 大改善；通过 RET 复配 SBS，增加了改性沥青中的粘性成分；相较于 SBS 改性沥青，RET 复配 SBS 改性沥青的表面粗糙 度显著增大；RET 改性剂能够明显改善沥青混合料的高温稳定性；RET 与 SBS 改性剂复配，可有效弥补 RET 对沥青混合料 低温性能的不足，明显改善沥青混合料的疲劳性能和高温长期稳定性。 关键词：道路工程；RET ；改性沥青；机制；加速加载试验 中图分类号：U414 文献标志码：A Mechanism and performance of reactive elastomeric terpolymer modified asphalt and asphalt mixture HAO Peiwen*, CHANG Rui, LIU Hongying, CAO Xiaojuan (Key Laboratory for Road Structure and Material of MOC, Chang’an University, Xi’an 710064, China) Abstract ：The effect of RET (Reactive Elastomeric Terpolymer) on properties of matrix asphalt and SBS modified asphalt was discussed by viscosity test and dynamic shear rheometer test. The surface topography characteristics of SBS modified asphalt and RET composite SBS modified asphalt was analyzed by Atomic Force Microscopy (AFM). Through wheel tracking test, bending test at low temperature, bending fatigue test and accelerated loaded test, the technical performance of RET modified asphalt mixture was evaluated. Finally, the fatigue properties of different RET modified asphalt mixture were analyzed by Weibull distribution under different failure probabilities. The results show that RET using can significantly increase the viscosity and G*/sinδ of asphalt, which obviously improves the rheological properties of asphalt at high temperature; R