Abstract: The electrical resistivity, a crucial parameter for assessing the durability characteristics of concrete, demonstrates close correlations with concrete permeability and internal steel corrosion.This study involves constructing a three-phase composite material comprising mortar, aggregate, and the interfacial transition zone (ITZ).By applying steady-state electric currents to concrete specimens and utilizing finite element analysis, we estimated the effective electrical resistivity of concrete.Random aggregate modeling was conducted for 1090 concrete samples to explore the impact of various microstructural parameters (such as ITZ thickness, conductivity, aggregate shape, and content) on the effective electrical resistivity of concrete.For a specific microstructural configuration (Vagg=0.4, εitz=20 μm, k=5, circular aggregates), the study proposed the size of the representative volume element (RVE) for concrete effective electrical resistivity based on statistical analysis and experimental results, laying the groundwork for investigating the durability performance of two-dimensional three-phase concrete.The results indicate that the effective electrical resistivity of concrete decreases with an increase in ITZ thickness and conductivity, increases with an increase in aggregate content, and circular aggregates exhibit the shortest current transmission path, resulting in the minimum effective electrical resistivity.When the RVE size reaches seven times the maximum aggregate particle size, the calculated coefficient of variation and relative error of concrete effective electrical resistivity are both less than 0.02.
夏晋, 郑宇航, 汪雨青. 基于多尺度模型的混凝土有效电阻率与几何代表尺寸研究[J]. 材料导报, 2025, 39(4): 24020001-7.
XIA Jin, ZHENG Yuhang, WANG Yuqing. Study on Effective Resistivity and Representative Volume Element of Concrete Based on Multi-scale Model. Materials Reports, 2025, 39(4): 24020001-7.
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2025, Vol. 39 
