Anomalous diffusion during water absorption in porous building materials - Experimental evidence

被引：9
|
作者：
Ramos, N. M. M. [1 ]
Delgado, J. M. P. Q. [1 ]
de Freitas, V. P. [1 ]
机构：
[1] Univ Porto, LFC, Dept Civil Engn, Fac Engn, P-4200465 Oporto, Portugal
来源：
DIFFUSION IN SOLIDS AND LIQUIDS III | 2008年 / 273-276卷
关键词：
moisture diffusivity; anomalous diffusion; water sorption coefficient; building materials;
D O I：
10.4028/www.scientific.net/DDF.273-276.156
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The sorption and transport of water in two porous building materials, clay brick and autoclaved aerated concrete, was studied in detail. The evolution of the distribution of liquid in the porous medium was analysed in terms of the Boltzmann transform method and anomalous diffusion equation proposed by Kuntz and Lavallee [1]. The apparent moisture diffusion coefficients of water were determined from the total water profiles using a modified Boltzmann-Matano analysis, and a good agreement with literature values was found. The application of anomalous diffusion model to building materials indicates that the previous t(1/2) relation is not entirely accurate to estimate the volume of absorbed water. This result has particular relevance for evaluating the durability of building structures.
引用
收藏
页码：156 / 161
页数：6
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