多孔介质中的电扩散

A. Aït-Mokhtar, O. Millet, O. Amiri
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引用次数: 0

摘要

采用周期性均质化技术对饱和水泥基材料中氯离子的输运进行了宏观模拟。通过对能斯特-普朗克方程进行量纲分析,得到表征该问题的无量纲参数。考虑实验验证中施加的电场,对能思-普朗克方程进行渐近展开,得到一个只涉及迁移的宏观模型。从这个分析,一个经典的实验程序允许得到均匀化扩散系数。
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Electrodiffusion in porous media
ABSTRACT A macroscopic modelling of the chloride transport through saturated cement-based materials is carried out by using the periodic homogenization technique. The dimensional analysis of Nernst-Planck equation leads to dimensionless parameters characterizing the problem. Given the electrical field applied in the experimental validation, the asymptotic expansion of Nernst-Planck equation leads to a macroscopic model only involving migration. From this analysis, a classical experimental procedure allows obtaining the homogenized diffusion coefficient.
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Index des titres Volume 11/2007 A new experimental device for assessing the radial strains of concrete at high temperatures Réponses mécaniques d'une suspension de bentonite activée Modélisation par éléments discrets d'ouvrages 3D en génie civil Index des auteurs Volume 11/2007
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