EFFECT OF CRACKS ON CHLORIDE DIFFUSION PROCESS IN CONCRETE AT MESO-SCALE: THEORETICAL STUDY AND APPLICATION

Author(s): ChenAirong, Pan Zichao
Paper category: Proceedings
Book title: Proceedings of CONSEC13 Seventh International Conference on Concrete under Severe Conditions - Environment and Loading Volume I
Editor(s): Z.J. Li, W. Sun, C.W. Miao, K.Sakai, O.E. Gjørv, N.Banthia
ISBN: 978-2-35158-124-7
e-ISBN: 978-2-35158-134-6
Publisher: RILEM Publications SARL
Publication year: 2013
Pages: 468-478
Total Pages: 961
Language : English

Abstract: Reinforced concrete (RC) structures suffer a lot from the chloride attack in marine environment or where the deicing salt is used. The open-cracks near the surface of the concrete components, e.g. girder, pier, usually provide a special path for chloride ions to penetrate into the concrete, which makes the distribution of chloride ions near the cracks is different from other regions. This paper mainly discusses the effect of cracks on chloride diffusion process by a numerical approach. A coupled lattice and solid model is firstly developed to identify the crack pattern under typical loadings, and connect the structural mechanical analysis and chloride diffusion analysis. An updated empirical model describing the relationship between crack width and chloride diffusion coefficient is proposed. Smeared crack model is used to analysis the chloride diffusion coefficient in cracked concrete. Finally, an example is provided to demonstrate the application of this research in engineering practice, especially in prediction of the initial position and time where and when the steel rebar starts to corrode.

Online publication : 2013
Publication type : full_text
Public price (Euros) : 0.00