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中文摘要：
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。
英文摘要：
In this paper, a definition of a representative volume element （RVE） based on the meso-structure of concrete, as well as a method for determining the RVE size of concrete is proposed by means of statistical analyses of the mesoscale structural characteristics of concrete. The voxel concept is employed to calculate the statistical variable of a volume fraction, the average diameter and fineness module of a coarse aggregate. Accordingly, the RVE size of one-grade concrete is quantitatively determined. The effects of an aggregate gradation, the aggregate volume fraction on RVE size are also studied. The data show that： the RVE size decreases with the increase of the aggregate volume fraction and gradually become stable; the ratio of RVE size to the maximum aggregate diameter for one-grade concrete is larger than that for two-grade concrete. The results have implications in choosing a meso-structure of concrete for the mechanical study at meso level and numerical simulation.
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