废旧PP/SBR复合改性沥青流变及疲劳特性分析  

Analysis on Rheological and Fatigue Properties of Waste PP/SBR Composite Modified Bitumen

作　　者：赵香玲[1] 张浩 米国兴 赵毅 ZHAO Xiangling;ZHANG Hao;MI Guoxing;ZHAO Yi(Shaanxi Railway Institute,Weinan,Shaanxi 714000,China;Shaanxi Provincial Transport Planning Design and Research Institute Co.,Ltd.,Xi'an,Shaanxi 710000,China;Xi'an New Window Technology Co.,Ltd.,Xi'an,Shaanxi 710000,China)

机构地区：[1]陕西铁路工程职业技术学院,陕西渭南714000 [2]陕西省交通规划设计研究院有限公司,陕西西安710000 [3]西安新视窗科技有限公司,陕西西安710000

出　　处：《公路工程》2023年第5期154-160,173,共8页Highway Engineering

基　　金：陕西省交通科技项目(21-53K,19-07K)。

摘　　要：为提高道路沥青的路用性能,研究利用废旧聚丙烯(Polypropylene,PP)和丁苯橡胶(Styrene Butadiene Rubber,SBR)对基质沥青进行复合改性,通过布氏黏度、高低温流变和疲劳性能试验对复合改性沥青的性能变化规律进行系统分析并评价。结果表明:PP的掺加可显著改善SBR改性沥青的高温弹性变形及恢复性能,提高其临界温度2~9℃,但会引起抗疲劳性能和低温应力松弛性能一定程度衰减;然而,只要将PP掺量控制在6%以内,其不利影响相对较小。综合分析高低温性能和疲劳性能表现,废旧PP/SBR复合改性沥青的推荐最佳掺量为:6%PP+4%SBR。In order to enhance the road performance of matrix bitumen,waste polypropylene(PP)and styrene butadiene rubber(SBR)were utilized to modify matrix bitumen.The performance variation law of the composite modified bitumen was compared and analyzed through rotational viscosity test,high-and low-temperature rheological test and fatigue test.The results demonstrated that the addition of PP could significantly enhance the high-temperature elastic deformation and recovery performance,and increase the corresponding critical temperature by 2~9 ℃,while it might degrade the fatigue resistance and low-temperature stress relaxation performance to a certain extent with regrading to SBR modified bitumen;however,the adverse effect was relatively small as long as the PP content could be controlled within 6%.Based on the comprehensive analysis of high and low temperature performance and fatigue characteristics,the recommended proportion of waste PP/SBR composite modified bitumen is 6%PP+4%SBR.

关 键 词：道路工程 SBR改性沥青 废旧聚丙烯(PP) 高低温流变性能 抗疲劳性能 

分 类 号：U414[交通运输工程—道路与铁道工程]