Anomalous Diffusion during Water Absorption in Porous Building Materials – Experimental Evidence

Abstract:

Article Preview

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 Küntz and Lavallée [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 1/ 2 t relation is not entirely accurate to estimate the volume of absorbed water. This result has particular relevance for evaluating the durability of building structures.

Info:

Periodical:

Defect and Diffusion Forum (Volumes 273-276)

Edited by:

Andreas Öchsner and Graeme E. Murch

Pages:

156-161

DOI:

10.4028/www.scientific.net/DDF.273-276.156

Citation:

N.M.M. Ramos et al., "Anomalous Diffusion during Water Absorption in Porous Building Materials – Experimental Evidence", Defect and Diffusion Forum, Vols. 273-276, pp. 156-161, 2008

Online since:

February 2008

Export:

Price:

$35.00

In order to see related information, you need to Login.