季冻区沥青混合料疲劳寿命的组成及变化特性  

Composition and Characteristics of Asphalt Mixture Fatigue Life in Seasonal Area

作　　者：郭学东[1] 李济鲈 孙明志[1] 朱凯旋[1] GUO Xue-dong;LI Ji-lu;SUN Ming-zhi;ZHU Kai-xuan(School of Transportation,Jilin University,Changchun 130000,China)

机构地区：[1]吉林大学交通学院,长春130000

出　　处：《科学技术与工程》2018年第16期271-277,共7页Science Technology and Engineering

基　　金：国家自然科学基金(51178204)资助

摘　　要：沥青混合料的疲劳裂缝是导致沥青路面面层破坏的主要原因之一,也是加速引起沥青路面水损害、老化等的重要原因。采用应力控制模式加载下的小梁弯曲试验,研究了不同温度或应力比下沥青混合料疲劳寿命的组成及变化特性。研究发现,沥青混合料的疲劳全寿命随温度的升高而缩短;相同温度时,沥青混合料的疲劳全寿命随着应力比的增大而缩短。当温度偏高时,沥青路面疲劳拓展寿命占据疲劳全寿命的比例较大;当温度偏低时则相反。疲劳全寿命的对数值与温度、应力比均成反比。裂纹拓展寿命占疲劳全寿命的百分比和温度呈指数关系。The asphalt mixture fatigue crack is one reason that mainly cause the asphalt pavement surface layer to be destroyed. And it is also an significant reason that can accelerate the water damage and the ageing problem of the asphalt pavement. The beam bending test is used to study the composition and changing characteristic of the asphalt mixture＇s whole fatigue life by the model of stress controlling loading in different temperature or stress ratios.It is found that as the temperature increases,the whole fatigue life of asphalt mixture becomes shorter. At the same temperature,the whole fatigue life of asphalt mixture becomes shorter with the increase of the stress ratio. The fatigue developing life accounts for a higher proportion in the whole fatigue life of the of asphalt pavement when the temperature is higher. While when the temperature is lower,there is an opposite conclusion. The logarithm of whole fatigue life is inversely proportional to the temperature and the stress ratio of the crack is an exponential relationship between the percentage of the crack developing life fatigue life account for the whole fatigue life and the temperature show an exponential relationship.

关 键 词：沥青混合料 疲劳全寿命 温度 应力比 全寿命组成 

分 类 号：U414[交通运输工程—道路与铁道工程]