水泥混凝土路面加铺层的疲劳性能

Fatigue performance of overlay on concrete pavement

水泥混凝土路面加铺层受到车辆荷载和温度的反复作用,结构设计时需考虑其疲劳性能。采用老混凝土表面凿毛并涂刷粘结剂的方法增强界面粘结,进行新老混凝土复合结构的疲劳试验,分析了影响加铺层疲劳性能的主要因素。结果表明:复合试件整体强度越高,上层钢纤维混凝土加铺层厚度越大,其疲劳寿命越长。最后,运用双参数Weibull分布,回归出不同失效概率下新老混凝土粘结复合结构的疲劳方程,从而为加铺层结构设计提供参数。

Cement concrete pavement with overlay withstands the repeated actions of traffic and temperature, so the fatigue property must be considered in structure design. After roughening the surface of old cement concrete pavement and smearing the binding agent to strengthen the bond between the interfaces of old pavement and overlay, the fatigue tests of compound structure of new and old concrete are carried out to analyze the main factors that influencing the fatigue performance of overlay. The results show that the fatigue life becomes longer with the increase of whole strength of compound structure and the increase of overlay depth of steel fiber concrete. The fatigue formulas of different invalidation probabilities of compound structure are regressed with Weibull distribution of two parameters, which can provide the reference parameters for overlay structure design. 5 tabs, 2 figs, 7 refs.