超热老化条件下改性沥青的性能变化规律分析

Analysis of Performance Change of Modified Asphalt under Super Heat Aging

本文通过对基质沥青、SBS改性沥青以及高黏度改性沥青在6种温度下(190、200、210、220、230、240℃)进行的老化试验,分别得到六个不同的时间点(10、20、30、40、50、60 min)所测量的3种沥青软化点和针入度两大性能指标。试验结果表明,基质沥青在190~200℃短期(0~45 min)性能基本变化很小,基本不发生老化,可以直接使用。在210~220℃沥青性能变化处于"过渡"阶段;230~240℃沥青老化随时间变化趋于一致,老化程度较高;使用SBS改性剂和高黏改性剂对沥青进行改性,沥青的抗老化性能得到提升,相比基质沥青在6种温度下的老化程度降低了很多,有效解决了沥青在超热条件下的老化问题。

In this paper,through the aging test of matrix asphalt,SBS modified asphalt and high viscosity modified asphalt at 6 temperatures(190,200,210,220,230,240℃),3 kinds of asphalt softening points and penetration indexes measured at 6 different time points(10,20,30,40,50,60 min)are obtained.The test results show that the performance of matrix asphalt changes little in the short term(0~45 min)at 190~200℃,and it can be used directly.The performance of asphalt at 210~220℃is in the“transition”stage.The aging of asphalt at 230~240℃is consistent with time,and the aging degree is higher.Using SBS modifier and high viscosity modifier to modify bitumen,the aging resistance of asphalt is improved,and the aging degree of matrix asphalt at six temperatures has reduced many aging problems.