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通过工业CT断层扫描技术对标准的马歇尔试件进行了分析,并通过灰度识别方法确定了骨料、胶浆和空隙在灰度图中的概率分布特性,进而确定三者在沥青混合料中的几何信息和空间分布。为了确定空隙对于沥青混合料宏观强度的影响,将沥青混凝土中的空隙等效为裂纹并使用考虑了裂纹夹杂的广义自洽理论来定性分析裂纹的长度和密度与材料宏观强度之间的关系。并通过上述理论对马歇尔试件的几个典型断面进行分析,进而判断其薄弱位置。
The standard Marshall specimen was analyzed by industrial CT tomography, and the probability distribution characteristics of aggregates, mortars and voids in grayscale images were determined by grayscale identification method, and then the three were determined in asphalt mixture Geometrical information and spatial distribution. In order to determine the effect of void on the macroscopic strength of asphalt mixture, the void in asphalt concrete is regarded as crack and the relationship between crack length and density and macroscopic strength of material is qualitatively analyzed by using the generalized self-consistent theory which takes crack inclusions into consideration. Based on the above theories, several typical cross-sections of Marshall specimens are analyzed and their weak positions are judged.