盐冻循环对胶粉改性沥青混合料性能的影响

The Influence that Salt Freezing Cycles have on the Property of Rubber Powder Modified Asphalt Mixture

冬季寒冷地区路面易积雪结冰,常使用除冰盐进行融雪除冰。除冰盐的使用会对路面材料产生侵蚀。本文通过室内冻融循环试验分析盐冻融循环对胶粉改性沥青混合料的性能的影响。实验中考虑了温度、除冰盐浓度和冻融循环次数三个因素,按照正交原理进行试验,试验测得了试件的孔隙率和劈裂强度。经分析发现,随着盐浓度和冻融循环次数的增加,胶粉改性沥青混合料的孔隙率逐渐变大。说明冬季路面使用的除冰盐对胶粉改性沥青的破坏较严重,不宜大量使用。

In winter of cold region, pavements are easily frozen by snow and ice and deicing salt is often used for to melt ice. However,the use of deicing salt can produce erosion of pavement materials. In this article,the freeze-thaw cycle test was conducted to analysis the influence that salt freeze-thaw cycles had on porosity of rubber powder modified asphalt mixture. Temperature, concentration of deicing salt and the number of freeze-thaw cycles were considered in the test. The test was carried out in accordance with the orthogonal principle. The porosity and splitting strength of the specimens were got during the test. It was found that with the increase of salt concentration and the freeze-thaw cycles, porosity of rubber powder modified asphalt mixture increased gradually. It showed that deicing salt causes serious damage to the rubber powder modified asphalt of pavement and it is unfavorable to use in a large amount.