温度-盐分-冻融耦合作用下沥青混凝土疲劳寿命研究  

Research on Fatigue Life of Asphalt Concrete under Coupling Action of Temperature,Salt and Freeze-thaw

作　　者：吴金荣[1] 马芹永[1] 王文娟[1] 

机构地区：[1]安徽理工大学土木建筑学院,安徽淮南232001

出　　处：《公路交通科技》2014年第8期30-34,共5页Journal of Highway and Transportation Research and Development

基　　金：国家自然科学基金项目(E080510);安徽省高校省级自然科学研究项目(KJ2013A082)

摘　　要：为提高寒冷地区沥青路面的疲劳性能,对AC-16型沥青混凝土进行未冻融和冻融条件下的劈裂疲劳试验,得到了其应力疲劳方程。研究了温度、盐分和冻融循环次数耦合作用下,沥青混凝土疲劳寿命的变化规律。研究结果表明:沥青混凝土的疲劳寿命与其劈裂抗拉强度具有明显的相关性,即劈裂抗拉强度越高,疲劳寿命越大。温度、冻融循环和氯盐的侵蚀是影响沥青混凝土疲劳性能的重要因素。在相同的冻融循环温度下,随着冻融循环次数的增加,沥青混凝土疲劳寿命降低;在相同的冻融次数下,随着冻融温度的降低,沥青混凝土疲劳寿命降低。经饱和氯盐溶液冻融的沥青混凝土疲劳寿命明显低于经清水冻融的沥青混凝土疲劳寿命,说明盐分能够加剧沥青混凝土的疲劳破坏。In order to improve the fatigue performance of asphalt pavement in cold region, the split fatigue tests of AC-16 asphalt concrete with or without freeze-thaw conditions were carried out. The stress fatigue equations were obtained with the test results. The change laws for fatigue properties of asphalt concrete were studied under the coupling action of temperature, salt and freeze-thaw cycles. The results indicate that there is a clear correlation between fatigue life and split tensile strength in asphalt concrete, the higher split tensile strength is, the longer fatigue life get. Temperature, freeze-thaw cycles and chlorine salt corrosion are important factors which affect the fatigue performance of asphalt concrete. When freeze-thaw temperature is the same, the fatigue life of asphalt concrete decreases with the number of freeze-thaw cycle increasing. When the number of freeze-thaw cycle is certain, the fatigue life of asphalt concrete decreases with freeze-thaw temperature reducing. The fatigue life of asphalt concrete in saturated chlorine salt solution is obviously lower than that in water, which shows that chlorine salt can accelerate the fatigue failure of asphalt concrete.

关 键 词：道路工程 沥青混凝土 疲劳寿命 温度 氯盐腐蚀 冻融循环 劈裂疲劳试验 

分 类 号：U416.217[交通运输工程—道路与铁道工程]