NUMERICAL STUDY OF CHLORIDE INGRESS IN CONCRETE: EFFECT OF EXPOSURE CONCENTRATION

Author(s): Mohamad Achour (1,2), Ouali Amiri (2), François Bignonnet (2), Emmanuel Rozière (1), Mahdi Haidar (2)
Paper category: Proceedings
Book title: SynerCrete’18 International Conference on Interdisciplinary Approaches for Cement-based Materials and Structural Concrete
Editor(s): Miguel Azenha, Dirk Schlicke, Farid Benboudjema, Agnieszka Jędrzejewska
ISBN: 978-2-35158-202-2
e-ISBN: 978-2-35158-203-9
Publisher: RILEM Publications SARL
Publication year: 2018
Pages: 603-608
Total Pages: 6
Language : English

Abstract: 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.

Online publication : 2018
Publication type : full_text
Public price (Euros) : 0.00