Weibull分布模型在热再生沥青混合料疲劳特性分析中的应用研究

Application of Weibull Distribution Model in Fatigue Analysis of Hot Recycled Asphalt Mixture

摘要: 为研究热再生沥青混合料的疲劳特性，采用间接拉伸试验对热再生AC-25沥青混合料进行室内试验，同时，针对小样本疲劳试验结果的随机性和离散性，引入三参数Weibull分布模型分析试验数据。结果显示：热再生AC-25沥青混合料疲劳寿命服从三参数Weibull分布；不同保证率下的应力疲劳方程表明，温度升高使再生沥青混合料的抗疲劳性能大幅度降低，但同时降低了混合料疲劳性能对应力的敏感程度；应根据实际情况综合考虑选取合适的保证率进行沥青混合料疲劳寿命预估。

Abstract: In order to study the fatigue characteristic of hot recycled asphalt mixture, indirect tensile test was carried out aiming at hot recycled AC-25. In view of the randomness and discreteness of small sample fatigue test results, three-parameter Weibull distribution model was introduced to analyze test data. The results show that the fatigue life of hot recycled AC-25 obeys three-parameter Weibull distribution; the stress fatigue equation under different guarantee rates shows that the fatigue resistance of recycled asphalt mixture decreases greatly with the increase of temperature, but the sensitivity of fatigue performance to stress decreases at the same time; the appropriate guarantee rate should be selected to predict fatigue life of asphalt mixture according to the actual situation.