烯烃共聚物改性沥青的低温抗裂性能  

Low Temperature Crack Resistance of Olefin Copolymer Modified Asphalt

作　　者：朱超 沈菊男 袁福根 贾真 ZHU Chao;SHEN Junan;YUAN Fugen;JIA Zhen(School of Civil Engineering,Suzhou University of Science and Technology,Suzhou 215009,China)

机构地区：[1]苏州科技大学土木工程学院,江苏苏州215009

出　　处：《材料科学与工程学报》2024年第5期804-809,共6页Journal of Materials Science and Engineering

基　　金：江苏省生态道路技术产业化工程研究中心开放课题项目(GCZX2104,GCZX2103)。

摘　　要：本研究以丙烯酸丁酯(BA)为软单体、苯乙烯(ST)为硬单体进行自由基聚合制备出ST-BA无规共聚物。并以此共聚物为改性剂对沥青进行了改性并优化了改性工艺,研究了改性沥青在不同温度下的延度、弯曲梁流变(BBR)等性能。研究结果表明:ST-BA无规共聚物改性沥青的低温延展性得到大幅度提升,2%的共聚物掺量下改性沥青的10℃延度从16 cm提升到136 cm。BBR结果显示沥青低温抗裂性能提高,6%共聚物掺量的改性沥青蠕变速率提高了12.1%,蠕变劲度降低了23.5%。共聚物改性沥青的最佳制备方案为:ST和BA比例为2∶8、共聚物掺量为6%,剪切温度为130℃、剪切时间为5 min、剪切速率为3000 r/min。ST-BA无规共聚物对改性沥青的高温性能(针入度,60℃动力粘度)影响较小。Improving the ductility of asphalt is one of the ways to improve the cracking resistance of asphalt.In order to improve the ductility and crack resistance of asphalt at low temperatures,St-Ba random copolymer was prepared by free radical polymerization with butyl acrylate(BA)as soft monomer and styrene(ST)as hard monomer.The copolymer was used as the modifier to modify asphalt,and the modification process was optimized.The ductility and bending beam rheology(BBR)properties of modified asphalt at different temperatures were studied.The results showed that:1)the low temperature ductility of the modified asphalt was greatly improved,and the ductility of the modified asphalt at 10℃increased from 16 cm to 136 cm at 2% copolymer content.2)The BBR results showed that the cracking resistance of modified asphalt at low temperatures was improved.The creep rate of the modified asphalt with 6% copolymer content was increased by 12.1%,and the creep stiffness was decreased by 23.5%.3)The optimum preparation scheme of copolymer modified asphalt is as follows:ST to BA ratio 2∶8,copolymer content 6%,shear temperature 130℃,shear time 5 min and shear rate 3000 r/min.4)ST-BA random copolymer has little influence on the high temperature properties of modified asphalt(penetration degree,dynamic viscosity at 60℃).

关 键 词：聚烯烃 改性沥青 低温性能 

分 类 号：U414[交通运输工程—道路与铁道工程]