A DIRECT METHOD FOR DETERMINING CHLORIDE DIFFUSION COEFFICIENT BY USING MIGRATION TEST

This article proposes an analytical model for calculation of the effective diffusion coefficient. The model is based on Nernst-Planck equation, on electroneutrality and on measurements of current intensity. To validate this approach, the authors carried out migration tests on three different w/c (water to cement ratio) mortar samples (0.35, 0.50, 0.70), all with the same s/c (1:3). The authors showed that chronoamperometry is enough to calculate the chloride diffusion coefficient (thus avoiding the need for chloride titration, a heavy and time-consuming operation). In steady state, the resulting effective diffusion coefficients are larger than those usually obtained with models based on Nernst-Planck equation without electroneutrality. An explanation of these differences and the importance of electroneutrality are also discussed.

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    Elsevier

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    Kidlington, Oxford  United Kingdom  OX5 1GB
  • Authors:
    • Friedmann, H
    • Amiri, O
    • Ait-Mokhtar, A
    • Dumargue, P
  • Publication Date: 2004-11

Language

  • English

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Filing Info

  • Accession Number: 00986428
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Feb 8 2005 12:00AM