盐雾—温度耦合作用对沥青混合料性能影响规律研究

Research on Impact of Salt Mist-Temperature Coupling Actions on Performance of Asphalt Mixture

为了研究滨海地区盐雾环境对沥青混合料性能的影响,采用中性盐雾试验方法模拟滨海环境,设置15℃、25℃、35℃、45℃等4个养护温度,采取工程中常用的沥青混合料AC-13和SMA-13为研究对象。通过水稳定性、低温抗裂性及耐久性实验,对比分析沥青混合料在不同温度的盐雾环境作用一定时间后性能变化规律,分析盐雾侵蚀作用影响。研究结果表明：温度与盐雾的耦合作用对沥青混合料的低温抗裂性、水稳定性及耐久性均产生较大影响,尤其较高温度的盐雾环境作用一定周期后,其强度降低幅度超过40%。滨海盐雾地区服役的沥青混合料设计,需要进行耐盐雾作用影响分析。

In order to study the impact of salt fog on the performance of asphalt mixture in coastal region,the neutral salt spray test method is used to simulate the coastal environment,curing temperature is set at 15 ℃,25 ℃,35 ℃ and 45 ℃,the asphalt mixture AC-13 and SMA-13 are taken as the study objects.Through water stability,low temperature crack resistance and durability experiment,the performance variation rules of asphalt mixture under salt fog actions at different temperature are compared and analyzed.The results show that the coupling action of temperature and salt fog has significant impact on the low temperature crack resistance of asphalt mixture,water stability and durability,especially after a certain duration of high temperature salt fog environment,its strength reduces by more than 40%.The design of asphalt mixtures used in the coastal salt fog area requires the analysis on the salt spray resistance.