沥青混合料抗剪性能试验方法及影响因素研究

摘要

Shear properties of four types of asphalt mixtures were evaluated using different testing methods.The sensitivity analysis of factors on shear properties was conducted based on statistical meth-ods.It is found that there is no significant difference among different testing methods.The combination of the uniaxial compression test and indirect tension test is finally recommended for practice due to its sim-plicity.Testing conditions and mix types have significant effects on shear strength parameters of asphalt mixtures.Temperature and loading rate have the greatest effects on the cohesion,followed by the passing rate of the key sieves and binder properties.The most important factor for the angle of internal friction is the passing rate of the key sieves.%通过不同类型室内试验方法对4种沥青混合料的抗剪性能进行了评价；并采用统计学方法对沥青混合料抗剪性能的主要影响因素进行了敏感性分析。研究发现：采用不同试验方法得到的抗剪强度参数无显著性差异，在工程实践中推荐采用较为简便的单轴压缩试验和间接拉伸试验组合；试验条件和混合料类型均对沥青混合料抗剪强度参数有重要的影响。其中，对粘聚力影响最大的是温度和加载速率，其次为关键筛孔通过率和沥青性质；关键筛孔通过率是内摩擦角最重要的影响因素。