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Mesoscopic method for simulating the two-dimensional capillary water absorption process of concrete

DOI：

 作者 单位 邮编 王立成* 大连理工大学海岸和近海工程国家重点实验室 116024 殷鸿杰 大连理工大学海岸和近海工程国家重点实验室 邹凯 大连理工大学海岸和近海工程国家重点实验室

当混凝土结构表面局部区域或角部位置相邻侧面与潮湿环境接触时，水分在非饱和混凝土中将以二维毛细吸水的方式传输，呈现与一维毛细吸水过程不同的规律。本文基于非饱和流体理论，建立了混凝土二维毛细吸水规律研究的细观数值模拟方法，并开展了混凝土二维毛细吸水过程的数值仿真分析。结果发现，相同时间内，毛细吸水高度随混凝土表面与水接触区域面积的减小而减小，但单位面积的累计吸水量却表现出增加规律。粗骨料和界面过渡区（ITZ）会分别抑制和促进混凝土局部区域的二维毛细吸水过程。在数值模拟基础上，建立了混凝土一维与二维毛细吸水率之间的关系式。此外，定量分析了混凝土构件角部区域毛细吸水过程的交互效应。

When the local zone of a concrete member or adjacent sides of the corner position are exposed to moisture environment, water will ingress into the concrete interior in the form of two-dimensional capillary absorption, which is a process distinct from one-dimensional water movement. Based on the unsaturated flow theory, in this paper a mesoscopic method for simulating the two-dimensional capillary water absorption process of concrete was developed. The numerically simulated results show that as the localized zone of concrete surface exposed to moisture source decreases, the depth of capillary water absorption reduces for the same elapsed time. However, there is an increasing tendency in the cumulative water absorption per unit area. It was also found that coarse aggregate and the interfacial transition zone (ITZ) can locally inhibit and promote the two-dimensional capillary water absorption process of concrete, respectively. With help of the numerical simulation results, relationship between sorptivities of the one-dimensional and two-dimensional capillary absorption was proposed, and the interaction effect of capillary water absorption process in the corner zone of concrete member was quantitatively investigated.
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