PERCOLATION OF CAPILLARY PORES IN HARDENING CEMENT PASTES

In the initial stage of cement hydration, the capillary pores are all connected, and the cement matrix has a high permeability. With the increase of the degree of hydration, capillary pores decrease in volume and size and start to become disconnected; as a consequence, the permeability decreases as well. At a certain degree of hydration, the capillary pores are not connected any more, so that no connected path exists for the capillary transport; the result is a significant and sudden reduction in permeability. This article reports on a study of the pore structure and permeability of hardening cement pastes. The authors tests cement pastes with water/cement (w/c) ratio 0.4, 0.5 and 0.6 from day 1 up to 28 days of age with mercury intrusion porosimetry. At the same time, the water permeability was measured. The authors report the use of a numerical simulation model with which correlations between pore structure and permeability were found. The authors conclude that pore size distribution, critical pore diameter, and effective porosity are the crucial factors that determine the water permeability.

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  • Corporate Authors:

    Elsevier

    The Boulevard, Langford Lane
    Kidlington, Oxford  United Kingdom  OX5 1GB
  • Authors:
    • Ye, G
  • Publication Date: 2005-1

Language

  • English

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  • Accession Number: 00988993
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Apr 18 2005 12:00AM