SBR改性沥青老化动力性能  

Study on Aging Kinetic Performance of SBR Modified Asphalt

作　　者：张敏江[1] 焦兴华[1] 陈刚[1] 

机构地区：[1]沈阳建筑大学土木工程学院,辽宁沈阳110168

出　　处：《沈阳建筑大学学报（自然科学版）》2009年第3期478-481,共4页Journal of Shenyang Jianzhu University：Natural Science

基　　金：辽宁省交通厅重点科研项目(200702)

摘　　要：目的通过研究SBR改性沥青的老化动力性能,进一步探讨在动力因素的影响下沥青和骨料的黏附性.方法通过旋转薄膜烘箱试验,研究SBR改性沥青和基质沥青在不同老化温度、老化时间下的软化点变化规律,并以软化点为参数建立了SBR改性沥青老化动力学模型,以此研究SBR改性沥青的老化动力性能.结果与基质沥青相比,SBR改性沥青在150℃、163℃、180℃三个老化温度下的老化反应速率常数分别降低了26.8%、51.9%、21.4%;SBR改性沥青的反应活化能达到48.863 kJ.mol-1,比基质沥青提高了13.1%.结论以软化点为参数建立的沥青老化动力学方程能够较好的反映沥青的老化过程,SBR改性沥青比基质沥青具有较好的抗老化性能.By analyzing the aging properties of SBR modified asphalt and the cohesive properties between mineral particles and bituminous materials on the influence of dynamic factors, the rolling thin film oven test was preformed and the changes of softening point along with the aging temperature and aging time were compared between base asphalt and SBR modified asphalt. Based on parameter of softening point, aging kinetic model was established to research the aging kinetics performance of SBR modified asphalt. The reaction rate constant of SBR modified asphalt was decreased than that of matrix asphalt;The reaction activation energy of SBR modified asphalt reached to 48. 863 kJ·mol^-1 ,which had increased 13.1% than that.of matrix asphalt. The study indicates that the aging kinetic model based on parameter of softening point can express the aging process of asphalt and the anti-aging performance of SBR modified asphalt is better than that of matrix asphalt.

关 键 词：SBR 老化 软化点 指前因子 活化能 

分 类 号：U416[交通运输工程—道路与铁道工程]