冻融循环作用下透水再生混凝土损伤分析及寿命预测

Damage Analysis and Life Prediction of Pervious Recycled Concrete Under Freeze-thaw Cycles

为了研究冻融循环作用下透水再生混凝土的损伤情况及寿命预测方法,基于透水再生混凝土发生疲劳破坏和冻融破坏的冻融机理相类似,采用了分析疲劳破坏的方法,对透水再生混凝土冻融循环损伤进行研究。结果表明:试验数据中冻融循环次数较好地服从两参数Weibull概率分布,并基于Weibull分布模型,推导出不同损伤度下考虑再生混凝土粗骨料取代率影响的分布模型参数及冻融循环次数,提出了相应的损伤度演化方程,为透水再生混凝土冻融损伤寿命预测提供依据及参考。

In order to study the damage condition and life prediction method of pervious recycled concrete under the freeze-thaw cycle,by the method of analyzing fatigue failure and through the analysis and comparison,it is concluded that the mechanism of fatigue failure and freeze-thaw damage of pervious recycled concrete is similar,the damage analysis of the pervious recycled concrete under freeze-thaw cycles is analyzed thereafter.The results show that the number of freeze-thaw cycles in the experimental data is better subject to the two-parameter Weibull probability distribution,and based on the Weibull distribution model,the distribution model parameters and freeze-thaw cycles considering the effect of the replacement rate of recycled coarse aggregate under different damage levels are derived,and the evolution equation between damage degree and freeze-thaw cycles number is given,which provided the basis and reference for the prediction of freeze-thaw life of pervious recycled concrete.