Numerical study of chloride ingress in concrete: effect of exposure concentration
Résumé
The corrosion process is usually described into two periods that model the service life of the reinforced concrete structures such as bridges and other structures exposed to marine environments: 1) the initiation period and 2) the propagation period. The initiation period is the time required for aggressive substances (e.g., carbon dioxide, chlorides, etc.) to penetrate from the environment into the cover concrete until critical chloride ion concentration is reached at the bar reinforcement to initiate the corrosion process. In the present paper, a numerical model is developed to study the effect of the exposed concentration of chloride on the initiation period of the corrosion. This initiation period is modelled by considering physico-chemical interactions between the ions and the solid components of the concrete. Several examples of application of the model are presented to show the interest of studying the influence of the exposure concentration of chloride ions on the penetration depth in the concrete. The effects of chloride binding, chemical activity of the pore solution and electrostatic interactions are also presented.
Domaines
Génie civil
Origine : Fichiers produits par l'(les) auteur(s)
Licence : CC BY NC - Paternité - Pas d'utilisation commerciale
Licence : CC BY NC - Paternité - Pas d'utilisation commerciale