热-水-光综合作用对沥青老化影响的分析

The analysis of impacts on asphalt aging under complex condition of heat-water-light

为研究温度、降雨及紫外光辐射等环境因素对沥青路面老化的影响,利用热氧、热氧-紫外光、热氧-水和热氧-水-紫外光等4种环境因素的组合对泰普克70#沥青进行了老化试验。试验以旋转薄膜烘箱老化(RTFOT)和压力老化(PAV)为基础,考虑时间、水分及紫外光因子,通过对老化后的沥青进行软化点、针入度、延度及粘度的测试,分析4种组合作用下沥青老化性质随时间的变化。试验结果表明:高温、水分和紫外光均能引起沥青老化,且老化程度随时间的增加而增加。沥青老化后软化点、针入度及粘度的差异越来越显著;紫外光比水更能引起沥青老化;经过水老化后的沥青再经光老化,其性质衰减特别明显。

In order to explore the impacts of temperature, rainfall, ultraviolet radiation and other environmental factors on the aging of asphalt pavement, the combination of four kinds of environment factors such as thermal-oxygen, heat-oxygen-ultraviolet, heat-oxygen-water and heat-oxygen-water-ultrav-iolet were utilized for aging the Tipco 70# asphalt. The experiment was based on rolling thin-film oven test （RTFOT） and pressure aging vessel（PAV） test, time, moisture and ultraviolet were taken into consid- eration. By carrying on asphalt test of softening point, penetration, ductility and viscos- ity after aging, analysis of four combinazation effects of asphalt aging properties with time change. It was found that heat, moisture and ultraviolet could cause asphalt aging, the aging degree increases over time, and the difference of test index was more and more significant. The results also showed that ultraviolet light can cause asphalt aging more than water. The asphalt through the ultraviolet aging after water aging, the attenuation of properties would be evident particularly.