摘要
针对SBR改性沥青高温性能的不足,采用高速剪切法制备了SBR-TPS复合改性沥青,分别测试了不同TPS掺量下改性沥青的软化点、延度,以及弹性恢复率等指标,确定了改性剂的最佳掺量为3%SBR+4%TPS.通过动态剪切流变(DSR)和低温弯曲试验(BBR),对韩国GS90^#基质沥青、SBR改性沥青及SBR-TPS复合改性沥青的流变性能进行了研究,通过荧光显微分析、红外光谱分析,以及差示扫描量热分析等微观结构研究,探究了复合改性机理.结果表明:加入适量TPS改性剂不仅能有效提高沥青的弹性恢复率,而且能够显著改善SBR改性沥青高低温性能;SBR+TPS制备复合改性沥青的改性机理为化学改性与物理改性的叠加,且SBR与TPS具有良好的协同改性作用.
In view of the deficiency of high temperature performance of SBR modified asphalt,SBR-TPS composite modified asphalt was prepared by high speed shear method The softening point,ductility and elastic recovery rate of modified asphalt with different TPS content were tested respectively,and the optimum content of modifier was determined to be 3%SBR+4%TPS.Through dynamic shear rheology(DSR)and low-temperature bending test(BBR),the rheological properties of GS90#base asphalt,SBR modified asphalt and SBR-TPS composite modified asphalt in Korea were deeply studied.The mechanism of composite modification was explored by studying the microstructure such as fluorescence microscopy,infrared spectroscopy and differential scanning calorimetry.The results show that the addition of appropriate amount of TPS modifier can not only effectively improve the elastic recovery rate of asphalt,but also significantly improve the high and low temperature performance of SBR modified asphalt.The modification mechanism of composite modified asphalt prepared by SBR+TPS is the superposition of chemical modification and physical modification,and SBR and TPS have good synergistic modification effect.
作者
陈辉强
熊亮
兰滔
CHEN Huiqiang;XIONG Liang;LAN Tao(School of Civil Engineering, Chongqing Jiaotong Univesity, Chongqing 400074, China)
出处
《武汉理工大学学报（交通科学与工程版）》
2020年第4期597-601,共5页
Journal of Wuhan University of Technology（Transportation Science & Engineering）
基金
国家自然科学基金项目资助(51708072)。
关键词
复合改性
沥青
流变性能
改性机理
composite modification
asphalt
rheological property
modification mechanism
