Paper Title:
Anomalous Diffusion during Water Absorption in Porous Building Materials – Experimental Evidence
  Abstract

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, J. M.P. Delgado, V.P. de Freitas, "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
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Price
$32.00
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