聚酯纤维复配RET改性沥青混合料的技术性能  

Technical performance of RET modified asphalt mixture with polyester fiber

作　　者：常睿[1] 郝培文[1] 

机构地区：[1]长安大学道路结构与材料交通行业重点实验室,陕西西安710064

出　　处：《江苏大学学报（自然科学版）》2017年第4期484-490,共7页Journal of Jiangsu University：Natural Science Edition

基　　金：国家自然科学基金资助项目(51278060)

摘　　要：为了研究聚酯纤维和RET对沥青混合料的性能影响,通过贯入剪切试验、半圆弯拉试验以及小梁弯曲疲劳试验,采用贯入剪切强度、断裂能密度与疲劳寿命评价聚酯纤维与RET对沥青混合料的高温稳定性、低温抗裂性以及抗疲劳性能的影响,并与SBS,SBR改性沥青混合料进行对比研究.最后采用Weibull分布,分析不同沥青混合料在不同失效概率下的疲劳性能.研究结果表明:相比于SBS,SBR改性沥青混合料,复配改性沥青混合料的贯入剪切强度、断裂能密度以及疲劳寿命显著提高,因此聚酯纤维复配RET能够显著改善沥青混合料的高温稳定性,有效改善RET改性沥青混合料的低温性能,且对沥青混合料的疲劳性能有较显著的影响.To investigate the effects of polyester fiber and RET on the performance of asphalt mixture, high temperature stability, low temperature crack resistance and anti-fatigue performance of RET modified asphalt mixture with polyester fiber were evaluated through penetration shear test, semi-circular bending test and bending fatigue test. Penetration shear strength, fracture energy density and fatigue life were compared with those of SBS and SBR modified asphalt mixture. The fatigue properties of different asphalt mixtures were analyzed by Weibull distribution under different failure probabilities. The results show that compared with SBS and SBR modified asphalt mixture, the penetration shear strength, the fracture energy density and the fatigue life of composite modified asphalt mixture are increased significantly. RET and polyester fiber can significantly improve high temperature stability of asphalt mixture, and the low temperature performance of RET modified asphalt mixture can be effectively improved. The polyester fiber composite RET has significant effect on the fatigue property of asphalt mixture.

关 键 词：沥青混合料 改性沥青 聚酯纤维 RET 抗疲劳性能 

分 类 号：U414[交通运输工程—道路与铁道工程]