A Percolation Model for Water Sorption in Porous Cementitious Materials

  1. Prof. F. H. Wittmann
  1. Bernhard Elsener,
  2. Dieter Flückiger and
  3. Hans Böhni

Published Online: 23 DEC 2005

DOI: 10.1002/3527606211.ch23

Materials for Buildings and Structures, Volume 6

Materials for Buildings and Structures, Volume 6

How to Cite

Elsener, B., Flückiger, D. and Böhni, H. (2000) A Percolation Model for Water Sorption in Porous Cementitious Materials, in Materials for Buildings and Structures, Volume 6 (ed F. H. Wittmann), Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim, FRG. doi: 10.1002/3527606211.ch23

Editor Information

  1. ETH Zürich, Institut für Baustoffe, Werkstoffchemie und Korrosion, ETH Hönggerberg, HIF E12, 8093 Zürich, Switzerland

Author Information

  1. Institute of Materials Chemistry and Corrosion, Swiss Federal Institute of Technology ETH Hönggerberg, CH-8093 Zurich, Switzerland

Publication History

  1. Published Online: 23 DEC 2005
  2. Published Print: 20 APR 2000

Book Series:

  1. EUROMAT 99

ISBN Information

Print ISBN: 9783527301256

Online ISBN: 9783527606214

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Keywords:

  • transport phenomena and durability;
  • porous cementitious materials;
  • water sorption;
  • percolation model

Summary

The highly disordered pore system of cement paste is described and numerically modelled as fractal structure. Water sorption experiments on cement paste with different porosity and numerical percolation experiments with Monte Carlo simulations are performed and have shown to be self similar, thus the percolation theory with the percolation threshold pc describes the kinetics of water sorption at all porosities consistently. With the same percolation model (connectivity of pores) the deviation from the classical power law for water sorption at long times and low porosities, the drastic reduction of the effective diffusion coefficient and the sharp increase in resisitivity with lower porosity and lower relative humidity can be explained.