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Computers and Concrete
  Volume 3, Number 6, December 2006, pages 401-422

Prediction of chloride ingress into saturated concreternon the basis of a multi-species model by numerical calculations
T.Q. Nguyen, V. Baroghel-Bouny and P. Dangla

    A multi-species model based on the Nernst-Planck equation has been developed by using a finite volume method. The model makes it possible to simulate transport due to an electrical field or by diffusion and to predict chloride penetration through water saturated concrete. The model is used in this paper to assess and analyse chloride diffusion coefficients and chloride binding isotherms. The experimental assessment of the effective chloride diffusion coefficient consists in measuring the chloride penetration depth by using a colorimetric method. The effective diffusion coefficient determined numerically allows to correctly reproduce the chloride penetration depth measured experimentally. Then, a new approach for the determination of chloride binding, based on non-steady state diffusion tests, is proposed. The binding isotherm is identified by a numerical inverse method from a single experimental total chloride concentration profile obtained at a given exposure time and from Freundlich
Key Words
    chloride; durability; multi-species; predictive model; concrete.
T.Q. Nguyen and V. Baroghel-Bouny; Laboratoire Central des Ponts et Chauss?s, Paris, FrancernP. Dangla; Laboratoire des Matriaux et Structures du G?ie Civil, Champs sur Marne, France

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