Influence of cracking on the diffusion properties of cement-based materials -: Part I:: Influence of continuous cracks on the steady-state regime
Influence of cracking on the diffusion properties of cement-based materials -: Part I:: Influence of continuous cracks on the steady-state regime
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DOI：
10.1016/s0008-8846(99)00201-x
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发表时间：
2000-01-01
影响因子：
11.4
通讯作者：
Marchand, J
中科院分区：
文献类型：
--
作者：
Gérard, B;Marchand, J
研究了横向裂缝对混凝土稳态扩散性能的影响。首先用解析方法从理论上评估了各向异性和各向同性裂纹网络的影响。为了简化输运方程，假定裂纹尺寸均匀且均匀分布在一维或二维网格上。然后将理论分析的结果与实验数据进行了比较。这两个系列的结果都表明，裂解可以显著改变材料的扩散性质，并有利于漂移物种的渗透(或淋滤)。提出了一种预测裂缝对混凝土扩散系数影响的简单方法。预测基于两个参数：裂纹密度和平均裂纹孔径。这种方法可以对严重损伤的混凝土构件的扩散性能提供初步估计。(C)2000爱思唯尔科学有限公司。保留所有权利。
The influence of traversing cracks on the steady-state diffusion properties of concrete was studied. The effect of both anisotropic and isotropic crack networks was first theoretically assessed using an analytical approach. To simplify the transport equations, cracks were assumed to be of uniform size and evenly distributed on a one- or two-dimensional grid. Results of the theoretical analysis were then compared to experimental data. Both series of results indicate that cracking can markedly alter the diffusion properties of the material and favor the penetration (or the leaching) of drifting species. A simple method to predict the effect of cracking on the concrete diffusivity is proposed. Predictions are made on the basis of two parameters: the crack density and the mean crack aperture. This method can provide a first estimate of the diffusion properties of severely damaged concrete elements. (C) 2000 Elsevier Science Ltd. All rights reserved.