PERMEABILITY, DIFFUSIVITY, AND MICROSTRUCTURAL PARAMETERS: A CRITICAL REVIEW

This article has the following two purposes: to provide a critical review of popular theories linking microstructure and transport coefficients of porous materials, and to explore the applications of new concepts, developed for analysing transport in sedimentary rocks, to understand transport processes in cementitious materials. The transport coefficients that are discussed diffusivity and permeability. The theories covered are Kozeny Carman's theory, the Katz-Thompson permeability theory, and Archie's law. All theories except the Katz-Thompson theory were found wanting. A good theory must be based on experimental characterizations of the pore structure that are reproducible, simply interpreted and directly relevant to transport properties. Theories like Korenz-Carman that are based solely upon porosity and surface to volume ratio do not fit this criterion, because not all porosity is available for transport, and the surface to volume ratio almost always greatly overestimates the relevant length scale for fluid flow. The unavailability of all porosity for transport is also a problem with Archie's law type theories, which are based on a power of the porosity. The ones, which are based on a power of the porosity. The theory must also be able to formulate these measured parameters into a prediction using mathematical principles that are relevant for the random geometry of the pore space. Finally, the theory must be applicable to a single sample. The only current theory which fits all criteria is the Katz-Thompson permeability theory, which is shown to apply to 0.4 w/c cement paste. (TRRL)

  • Availability:
  • Corporate Authors:

    Pergamon Press, Incorporated

    Headington Hill Hall
    Oxford OX30BW,    
  • Authors:
    • Garboczi, E J
  • Publication Date: 1990-7

Language

  • English

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00609687
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: Jun 30 1991 12:00AM