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An experimental study on the effect of chloride penetration on moisture diffusion in concrete

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Abstract

Chloride penetration and moisture diffusion are two important transport processes for studying the long-term durability of concrete. The chloride penetration and moisture transfer in concrete are considered as two coupled transport processes. An experimental study was conducted for determining the related material parameters in the coupled transport processes. For the coupled moisture diffusion, we consider that the total moisture fluxJ t H is resulted from two driving forces: the gradient of moistureH, and the gradient of free chlorideC f , that is,J t H =−D H-H grad(H)−D H-Cl grad(C f′ ). In this formulation, two transport parameters are involved: the moisture diffusion coefficientD H-H and the coupled moisture diffusion coefficient due to chloride diffusionD H-Cl . A seepage test was designed specifically for determining the two transport parameters. The test data showed that the chloride penetration accelerates the moisture diffusion significantly. The two transport parameters were determined using the present test data. The result showed thatD H-Cl is not a constant, but depends linearly on the free chloride concentration.

Résumé

La pénétration des ions chlorure et la diffusion de l'humidité sont deux importants mécanismes de transport dans l'étude de la durabilité à long terme du béton. La pénétration du chlorure et le transfer de l'humidité dans le béton sont considérés comme deux processus de transport couplés. Une étude expérimentale a été conduite pour déterminer les paramètres matériels en question dans les processus de transport couplés. Pour la diffusion couplée de l'humidité, on considère que le flux total d'humidité J tH résulte de deux forces: le gradient d'humidité H, et le gradient d'ions chlorure libres, Cf′ en d'autres termes, J tH =−DH-Hgrad(H)−DH-Clgrad(Cf′). Dans cette formulation, deux paramètres de transport sont en jeu: le coefficient de diffusion DH-H, et le coefficient de diffusion couplé DH-Cl. Un test d'infiltration a été conçu spécifiquement pour déterminer ces deux paramètres de transport. Les données ont montré que la pénétration des ions chlore accélère la diffusion de l'humidité de façon significative. Les deux paramètres de transport ont été déterminés en utilisant ces données. Les résultats montrent que DH-Cl n'est pas constant, mais dépend linéairement de la concentration des ions chlorure.

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Authors and Affiliations

  1. Department of Civil, Environmental and Architectural Engineering, University of Colorado, 80309, Boulder, CO, USA

    A. Ababneh & Y. Xi

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  1. A. Ababneh
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  2. Y. Xi
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Ababneh, A., Xi, Y. An experimental study on the effect of chloride penetration on moisture diffusion in concrete. Mat. Struct. 35, 659–663 (2002). https://doi.org/10.1007/BF02480359

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