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

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）对基质沥青与苯乙烯-丁二烯-苯乙烯嵌段共聚物（SBS）改性沥青性能的影响，通过原子力显微镜（AFM）分析了SBS改性沥青和RET-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；通过掺入RET-SBS，增加了改性沥青中的黏性成分；相较于SBS改性沥青，RET-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。

Mechanism and performance of reactive elastomeric terpolymer modified asphalt and asphalt mixture

The effect of reactive elastomeric terpolymer (RET) on properties of matrix asphalt and styrene butadiene styrene block copolymer(SBS) modified asphalt was discussed by viscosity test and dynamic shear rheometer test. The surface topography characteristics of SBS modified asphalt and RET-SBS modified asphalt were 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 can significantly increase the viscosity and rutting resistance factor of asphalt, which obviously improves the rheological properties of asphalt at high temperature; RET-SBS modified asphalt can improve viscous component of asphalt; Compared with SBS modified asphalt, the surface roughness of RET-SBS modified asphalt increases significantly; RET has a significant effect on improving stability at high temperature; RET-SBS modified asphalt can improve crack resistance at low temperature, the fatigue properties and long-term stability at high temperature of asphalt mixtures.