特立尼达湖沥青/热塑性丁苯嵌段共聚物复合改性沥青混合料改性机理及性能  

Modification Mechanism and Performance of Trinidad Lake Asphalt/Styrene-Butadiene-Styrene Composite Modified Asphalt Mixture

作　　者：王亚 王显光[2] 张立文 WANG Ya;WANG Xian-guang;ZHANG Li-wen(Institute of Design and Management, China Construction Eighth Engineering Division Co.,Ltd., Shanghai 201206, China;Research Institute of Sciences, Ministry of Transport, Beijing 100029, China)

机构地区：[1]中国建筑第八工程局有限公司设计管理总院,上海201206 [2]交通运输部科学研究院,北京100029

出　　处：《科学技术与工程》2021年第33期14387-14392,共6页Science Technology and Engineering

基　　金：交通运输部交通强国专项研究(2019-24-12)。

摘　　要：为弥补特立尼达湖沥青(Trinidad Lake asphalt,TLA)在某些性能方面的不足,考虑加入热塑性丁苯嵌段共聚物(styrene-butadiene-styrene,SBS)改性剂进行改善。首先,从微观及化学组成分析了TLA的改性机理。然后,对TLA和TLA/SBS复合改性沥青性能分别进行了测试,并对不同TLA掺量下的TLA/SBS沥青混合料进行了动稳定度、稳定度、水稳性、低温抗裂性、抗疲劳、动态模量等指标的试验。结果表明,复合改性显著地改善了基质沥青的软化点、延度、黏度指标,一般在45%以上;复合改性后的沥青混合料各项指标都得到了明显的提升,特别是高、低温稳定性、抗疲劳性能、动态模量提升幅度在13%~86%,具有良好的路用性能。最后,得出了沥青混合料中的SBS最佳掺量应为5%,TLA掺量为20%。To make up for the deficiency of Trinidad Lake asphalt(TLA)in some aspects,it was considered to add styrene-butadiene-styrene(SBS)modifier.Firstly,the modification mechanism of TLA was analyzed from the microscopic and chemical composition.Then TLA and TLA/SBS composite modified asphalt were tested respectively,and the dynamic stability,stability,water stability,low temperature cracking resistance,fatigue resistance,dynamic modulus and other indexes of TLA/SBS asphalt mixture with different TLA content were tested.The results show that the softening point,ductility and viscosity of base asphalt are significantly improved by the composite modification,generally over 45%.After the composite modification,various indexes of asphalt mixture have been significantly improved,especially the high and low temperature stability,anti-fatigue performance,dynamic modulus increase range of 13%~86%,with excellent pavement performance.Finally,the optimal SBS content in asphalt mixture is 5%,and TLA content is 20%.

关 键 词：路面材料 特立尼达湖沥青(TLA) 热塑性丁苯嵌段共聚物(SBS)改性沥青 复合改性 路用性能 

分 类 号：U416.2[交通运输工程—道路与铁道工程]