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为更准确探明不同测量标距对沥青混合料动态模量的影响机制,选用国内常用的3种沥青混合料,采用国际上通用的2种不同测量标距,进行2个不同温度和3个不同频率下的间接拉伸动态模量测试,考虑到细观空隙分布与受荷条件下混合料的动态模量值密切相关,利用X-ray CT技术分析混合料内部空隙分布特征,测试结果表明采用较大的测量标距可以有效提高试验的精密度,减小动态模量的离散程度和变异性,不同测量标距范围内混合料的空隙变异情况与动态模量变异情况类似,该方法从细观尺度合理解释了不同测量标距条件下混合料动态模量差异机理,为今后进一步研究提供有益参考。
In order to more accurately ascertain the influence mechanism of different gauge gauges on the dynamic modulus of asphalt mixture, three commonly used asphalt mixtures in China were selected. Two different gauge gauges were used internationally, and two different temperature and three The indirect tensile dynamic modulus tests at different frequencies, taking into account the distribution of mesoscopic clearance and dynamic modulus of the mixture under load conditions are closely related to the use of X-ray CT analysis of the mixture of internal void distribution, the test results show The use of a larger measuring gauge can effectively improve the test precision and reduce the dispersion and variability of the dynamic modulus. The variation of void in the mixture within different measuring gauge ranges is similar to the variation of dynamic modulus. The mesoscale scale reasonably explained the difference mechanism of the dynamic modulus of the mixture under different measuring gauge conditions, and provided a useful reference for further research in the future.