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该文在对混凝土细观结构统计特征深入研究的基础上,基于粗骨料含量、平均粒径、细度模数三个量的统计特征分析,给出了混凝土几何代表体的定义。利用体素的概念,提出了混凝土几何代表体尺寸的确定方法。以一级配混凝土为例,采用该文方法计算得到了基于细观结构的几何代表体尺寸。进一步分析了骨料级配、骨料体积含量等因素对混凝土几何代表体尺寸的影响规律,研究结果表明:随着骨料体积含量的增加,混凝土几何代表体尺寸呈下降趋势;在粗骨料体积含量达到40%以后,几何代表体尺寸变化幅度较小;一级配混凝土的几何代表体尺寸与最大骨料粒径的比值大于二级配混凝土的相应值。该文工作为混凝土细观机理研究、细观数值计算样本的选取等提供参考。
Based on the thorough study of the statistical characteristics of concrete mesostructure, the paper presents the definition of geometric representation of concrete based on the statistical analysis of the three features of coarse aggregate content, average particle size and fineness modulus. Using the concept of voxel, a method to determine the geometry size of concrete is proposed. Taking the first grade concrete as an example, the geometrical representative body size based on mesoscopic structure is calculated by using the method. The effects of aggregate gradation and aggregate volume on the geometrical representation of concrete were further analyzed. The results show that the geometrical representation of concrete decreases with the increase of aggregate volume. After the volume content reaches 40%, the geometric representative body size changes a little. The ratio of the geometrical representative body size and the maximum aggregate size of the first grade concrete is larger than the corresponding value of the second grade concrete. The paper provides a reference for the study of meso-mechanism of concrete and the selection of mesoscopic numerical calculation samples.