摘要
将沥青混合料离析分为无、轻度和重度3种水平,根据不同程度离析混合料级配、沥青用量与空隙率等关键指标,计算不同季节不同离析程度的沥青混合料动态模量。根据动态模量,进行力学分析,计算得到不同程度离析发生在各个结构层时沥青混凝土层层底拉应变。运用AI疲劳方程,计算各个沥青混凝土层疲劳寿命,结果表明,发生离析层位的疲劳寿命大大减小,同时对其他没有发生离析层位的疲劳寿命也有一定的影响。
There are three segregation levels：none, low, and high. On the basis of asphalt mixture＇s grade, asphalt binder content and air void in different level segregation conditions, dynamic modulus of asphalt mixture are achieved. By mechanics analysis, the tensile strain of asphalt layer bottom where segregation occurs. The AI fatigue equation is used to estimate the fatigue life of asphalt pavement. The results indicate that segregation results in a large decrease in fatigue life of the layer in which the segregation occurs, and have a little effect on the layer in which the segregation doesn＇t occur.
出处
《公路》
北大核心
2008年第1期20-24,共5页
Highway
基金
交通部西部科技项目(200431882053)
关键词
沥青混合料
离析
动态模量
疲劳寿命
asphalt mixture
segregation
dynamic modulus
fatigue life
