温度与侵蚀对沥青混凝土冻融疲劳寿命的影响  

Influence of temperature and corrosion on freezing-thawing fatigue life of asphalt concrete

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：《冰川冻土》2015年第2期422-427,共6页Journal of Glaciology and Geocryology

基　　金：安徽省高校省级自然科学研究重点项目(KJ2013A082)资助

摘　　要：为了提高盐渍土地区沥青路面的疲劳性能,对SBS改性沥青混凝土进行了清水与饱和氯盐溶液的冻融劈裂疲劳试验,研究了温度与氯盐侵蚀共同作用下,沥青混凝土冻融疲劳寿命衰减规律.结果表明:温度与氯盐侵蚀是影响沥青混凝土冻融疲劳寿命的重要因素.当冻融次数相同时,沥青混凝土冻融疲劳寿命随冻融温度降低而不断减小;当冻融温度相同时,其冻融疲劳寿命随冻融次数增加而不断减小.饱和氯盐溶液中沥青混凝土冻融疲劳寿命明显低于清水条件,说明氯盐能够加速沥青混凝土冻融疲劳寿命衰减,冻融温度越低,盐冻破坏越严重.通过对试验数据回归分析可知,沥青混凝土冻融疲劳寿命与冻融循环次数之间具有较好的相关性,可以利用两者之间的指数函数关系来预测沥青混凝土冻融疲劳寿命.In order to improve the fatigue performance of asphalt pavement in saline soil areas,the freezing-thaw ing split fatigue tests of SBS asphalt concrete immersed in water or saturated chlorine solution were carried out. The attenuation law s of freezing-thaw ing fatigue life of asphalt concrete were studied under the combined action of temperature and chlorine salt corrosion. The results indicate that temperature and chlorine salt corrosion are important factors which affect the freezing-thaw ing fatigue life of asphalt concrete. When the freezing-thaw ing cycles are the same,the freezing-thaw ing fatigue life of asphalt concrete will decrease with freezing-thaw ing temperature decreasing. When freezing-thaw ing temperature is the same,the freezing-thaw ing fatigue life of asphalt concrete will decrease with the freezing-thaw ing cycles. The freezing-thaw ing fatigue life of asphalt concrete in saturated chlorine salt solution is obviously low er than that in water,which shows that chlorine salt can accelerate the fatigue failure of asphalt concrete; the low er the freezing-thaw ing temperature is,the more serious frost damage is. Regression analysis of the test data found that there is a good exponential relation betw een freezing-thaw ing fatigue life and freezing-thaw ing cycles in asphalt concrete,which can be used to predict the freezing-thaw ing fatigue life of asphalt concrete.

关 键 词：劈裂疲劳试验 沥青混凝土 冻融疲劳寿命 温度 氯盐侵蚀 

分 类 号：U414.18[交通运输工程—道路与铁道工程]