摘要
针对国内外对硫酸盐腐蚀环境下沥青混合料耐久性能研究甚少的现状,采用干湿循环作用下不同质量分数(2.5%,5%和10%)Na2SO4溶液加速劣化试验,研究了沥青混合料在硫酸盐腐蚀介质中的马歇尔力学性能、高温稳定性和低温抗裂性的变化规律。试验结果表明:沥青混合料在硫酸盐腐蚀环境下的性能衰减较蒸馏水环境下更为严重,且沥青混合料的性能随硫酸盐浓度的增加呈降低趋势;SMA-13沥青混合料的耐硫酸盐侵蚀性优于AC-13沥青混合料;SEM微观分析表明,硫酸盐溶液较蒸馏水更易侵入沥青膜与集料界面,加速水损害,并在干燥环境中结晶膨胀,导致界面强度降低,这是沥青混合料各项性能衰减的主要原因。
Few research has been done on the durability of asphalt mixture in the sulfate corrosion environment.In order to investigate the attenuation law of road performance of asphalt mixture under the action of sulfate corrosive medium,a series of accelerated deterioration tests through dry-wet cycles were carried out in Na2SO4 solution with different mass-ratios including 2.5%,5% and 10%.The results indicate that the attenuation of the performance of asphalt mixture in sulfate solution is more severe than that of being in distilled water.With the increase of sulfate mass-ratios,the performance of asphalt mixture takes on a decreasing trend.Besides,corrosion resistance to sulfate of SMA-13 asphalt mixture is superior to that of AC-13 asphalt mixture.According to SEM micro-analysis,it can be indicated that the sulfate solution is easier to invade the interface between asphalt binder and aggregate than distilled water to accelerate water damage along with crystal expansion made in dry environment,this action reduces the interface strength,plays the key role in the the rapid attenuation of the performance of asphalt mixture.
出处
《长安大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2011年第6期11-15,89,共6页
Journal of Chang’an University(Natural Science Edition)
基金
国家自然科学基金项目(50978031)
长安大学基础研究主持计划专项基金项目(CHD2010ZY014)
关键词
道路工程
沥青混合料
硫酸盐
干湿循环
化学腐蚀
微观损伤
road engineering
asphalt mixture
sulfate solution
wett-dry circle
chemical corrosion
microscopic damage
作者简介
熊锐（1982-），男，河南罗山人，工学博士研究生，Email：xiongr61@126．com。
