多聚磷酸/SBS复合改性沥青的高温流变特性  

High Temperature Rheological Properties of PPA/SBS Composite Modified Asphalt

作　　者：李超[1,2] 崔世超 王岚 白雪峰[1,2] LI Chao;CUI Shichao;WANG Lan;BAI Xuefeng(School of Civil Engineering,Inner Mongolia University of Technology,Huhhot 010051,China;Inner Mongolia Autonomous Region Key Laboratory of Civil Engineering Structure and Mechanics,Huhhot 010051,China)

机构地区：[1]内蒙古工业大学土木工程学院,呼和浩特010051 [2]内蒙古自治区土木工程结构与力学重点实验室,呼和浩特010051

出　　处：《材料导报》2020年第14期14057-14062,14069,共7页Materials Reports

基　　金：国家自然科学基金(11762012);内蒙古自治区交通运输厅建设科技项目(NJ-2014-21)。

摘　　要：为了研究多聚磷酸(PPA)/SBS复合改性沥青的高温流变特性,利用动态剪切流变仪(DSR)对四种不同掺量的PPA/SBS复合改性沥青及SBS改性沥青进行重复蠕变恢复试验(RCRT)。结果表明:PPA/SBS复合改性沥青变形恢复能力不受加载循环次数与应力水平的影响,但受温度的影响,其在蠕变阶段主要发生黏性流动变形,且卸载后黏性变形不可恢复;PPA/SBS复合改性沥青的累积应变随温度、应力水平和荷载作用次数的增加显著增大,特别是温度和应力水平对改性沥青累积应变的影响较大;在温度和应力水平相同的条件下,复合改性沥青中PPA 1%+SBS 3%的改性沥青蠕变劲度的黏性部分G v值最大,具有最好的高温抗变形能力。In order to study the high temperature rheological properties of polyphosphoric acid(PPA)/SBS composite modified asphalt,dynamic shear rheometer(DSR)was used to test four kinds of composite modified asphalt and SBS modified asphalt with different dosage of PPA by repeated creep recovery test(RCRT).The results show that:the deformation recovery capacity of PPA/SBS composite modified asphalt is not affected by the number of loading cycles and stress level,but is affected by temperature,and the viscous flow deformation mainly occurs in the creep stage,and the viscous deformation cannot be restored after unloading.The cumulative strain of PPA/SBS composite modified asphalt increases significantly with the increase of temperature,stress level and load action times,especially the temperature and stress level have a great influence on the cumulative strain of modified asphalt.Under the condition of the same temperature and stress level,the adhesive part G v value of creep stiffness of composite modified asphalt with PPA 1%+SBS 3%is the largest and has the best high temperature deformation resistance.

关 键 词：多聚磷酸改性沥青 SBS改性沥青 重复蠕变恢复试验 高温流变特性 

分 类 号：U414[交通运输工程—道路与铁道工程]