[EN] 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.

[FR] L'application croissante des champs ~lectriques au bdton, non seulement comme m~thode de caract&isation des mat&iaux, mais aussi comme syst~me de r~paration, a suscit~ un grand int&& pour l'&ude des procedures associ& s a l'application de ces techniques. Cependant, bien que les nombres de transfert soient des param~tres essentiels clans la description des processus de migration, aucune rdf~- rence sur l'&ude syst~matique de ces param~tres n'a ~t~ trouv& dans la litt&ature. Dans cet article, une s&ie d'essais de migration en ~tat stationnaire a diff&entes concentrations de chlorures, out ~t~ r~alis&. Les r&ultats exp&imentaux ont servi a valider un module de comportement bas~ sur les nombres de transfert et pr&ent~ clans cet article. Ce module de comportement permet d'examiner les nombres de transfert de toutes les esp&es impliqu&s pendant l'essai, ce qui permet de suivre l'&olution du syst~me pendant l'exp&ience de migration. Une proposition de nomenclature des hombres de transfert est dgalement propos&.

Peer reviewed