基于重复蠕变恢复试验的化学改性沥青高温性能  

High temperature performance of chemical modified asphalt based on repeated creep and recovery test

作　　者：陈治君[1] 郝培文[1] 

机构地区：[1]长安大学公路学院,陕西西安710064

出　　处：《江苏大学学报（自然科学版）》2017年第4期479-483,共5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：为了探究多聚磷酸(PPA)和反应型三元共聚物(RET)改性沥青的高温流变行为,基于重复蠕变恢复试验,深入研究基质沥青、PPA改性沥青、RET改性沥青及SBS改性沥青在不同加载应力及温度条件下黏弹性响应的变化规律,从温度、应力等方面对改性沥青的延迟弹性进行分析,并将PPA,RET与SBS等3种改性沥青的高温性能进行比较,更加客观地评价PPA和RET两种化学改性沥青的高温性能.采用Burgers模型对试验数据进行拟合,分析了蠕变劲度黏性成分与混合料车辙试验动稳定度的相关关系.结果表明:PPA和RET的加入可显著改善沥青的高温抗变形能力,提高路面的抗车辙性能.In order to explore the high temperature rheological properties of PPA and RET modified asphalt binders, the viscoelastic response law of base asphalt, PPA modified asphalt, RET modified asphalt and SBS modified asphalt under different load stresses and temperatures were investigated based on the repeated creep and recovery test. The delayed elastic behaviors of asphalt binders were analyzed from temperature and stress. The properties of PPA and RET asphalt binders were compared with those of SBS modified asphalt binder to objectively evaluate the high temperature performance of the two kinds of chemical modified asphalt binders. The Burgers model was adopted to fit the experimental data. The relevant relationship between viscous composition in creep stiffness and dynamic stability of asphalt mixture was analyzed. The results show that the addition of PPA and RET can significantly improve the deformation resistance of asphalt at high temperature to enhance the anti-rutting performance of asphalt pavement.

关 键 词：化学改性沥青 多聚磷酸 RET 重复蠕变恢复试验 蠕变劲度黏性成分 车辙试验 

分 类 号：U414[交通运输工程—道路与铁道工程]