Résumé: A method for predicting the chloride ingress into concrete structures, which is the first and main phase of chloride induced reinforcement corrosion, is developed. The different phenomena that contribute to the rate and amount of transported chlorides into concrete, i.e., heat transfer, moisture transport and chloride diffusion are modeled using a two dimensional nonlinear time dependent finite element method. In modeling the chloride transport, a modified version of Fick’s second law is used, in which processes of diffusion and convection due to water movement are taken into account. Besides, the effect of temperature variation is directly incorporated in the governing equation using a coupling term that is determined in this study. The partial differential equations are solved numerically in space as a boundary value problem and in time as an initial value problem. The proposed finite element model and its associated program are capable of handling pertinent material nonlinearities and variable boundary conditions that simulate real exposure situations. The numerical performance of the model was examined through few examples to investigate the effect of the different model parameters and mechanisms considered on the process of chloride penetration into concrete, and eventually, on the service life of concrete.

Edition: Jordanie: Universitè de Jordanie
Langue: Français
Collation: 108 p. ill. ;30 cm.
Diplôme: Master
Etablissement de soutenance: Universitè de jordanie