Abstract
Due to the increasing application of electrical fields to concrete, not only as a material characterisation method, but also as repair method, a great interest in the study of the processes associated with the application of these techniques has awaked. However, in spite of the fact that transference numbers are fundamental parameters in the description of migration processes, no references to a systematic study of these parameters during a migration experiment have been found in the literature. In the present paper, a series of steady state migration tests with different chloride concentrations have been performed. The experimental results have been used to validate a behaviour model based on transference numbers which is also developed in the paper. This behaviour model allows the pursuit of transference numbers of every species involved during the test, which gives a complete picture of the behaviour of the system during the migration experiment. A nomenclature of transference numbers is proposed as well.
Résumé
L'application croissante des champs électriques au béton, non seulement comme méthode de caractérisation des matériaux, mais aussi comme système de réparation, a suscité un grand intérêt pour l'étude des procédures associées à l'application de ces techniques. Cependant, bien que les nombres de transfert soient des paramètres essentiels dans la description des processus de migration, aucune référence sur l'étude systématique de ces paramètres n'a été trouvée dans la littérature.
Dans cet article, une série d'essais de migration en état stationnaire à différentes concentrations de chlorures, ont été réalisés. Les résultats expérimentaux ont servi à valider un modèle de comportement basé sur les nombres de transfert et présenté dans cet article. Ce modèle de comportement permet d'examiner les nombres de transfert de toutes les espèces impliquées pendant l'essai, ce qui permet de suivre l'évolution du système pendant l'expérience de migration. Une proposition de nomenclature des nombres de transfer est également proposée.
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Editorial Note Dr. Cannen Andrade is Vice-President of RILEM and a RILEM Fellow. She is the Chairlady of RILEM TC 154-EMC and of RILEM TC TMC. She is also Director of CSIC, a Titular Member.
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Castellote, M., Andrade, C. & Alonso, C. Modelling of the processes during steady-state migration tests: Quantification of transference numbers. Mat. Struct. 32, 180–186 (1999). https://doi.org/10.1007/BF02481513
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DOI: https://doi.org/10.1007/BF02481513