Chloride diffusion through saturated concrete: numerical and experimental results

Title: Chloride diffusion through saturated concrete: numerical and experimental results
Author(s): A. Khitab, S. Lorente, J.P. Ollivier
Paper category : conference
Book title: International RILEM Symposium on Concrete Science and Engineering: A Tribute to Arnon Bentur
Editor(s): J. Weiss, K. Kovler, J. Marchand, and S. Mindess
Print-ISBN: None
e-ISBN: 2912143926
Publisher: RILEM Publications SARL
Publication year: 2004
Nb references: 11
Language: English

Abstract: In this paper, the chloride diffusion through saturated cementitious material is documented numerically and experimentally. A 1-D numerical model based on a multi-species approach of the ionic transport is proposed. It is a new version of a previous model developed a few years ago in our group [1], which describes the diffusion of species with the Nernst-Planck equation instead of Fick’s laws. The continuity equation is solved directly. The Laplace equation is set equal to zero in the mass balance, meaning that local electroneutrality is assumed during the diffusion transport. Chloride interactions with the solid phase are accounted for by means of a power law type isotherm. It is assumed that chloride binding is balanced by release of hydroxyl to the pore solution. The chloride penetration profiles obtained from numerical simulations are compared with experimental profiles. The latter are the results of immersion tests at different salinities, namely 165 g/l and 33g/l of NaCl. Different times of exposure are used: 35, 100 and 200 days, for the first concentration. The relationship between bound chloride and free chloride is obtained from the total and free experimental chloride profiles.

Online publication: 2004-03-25
Classification: Transport
Publication type : full_text
Public price (Euros): 0.00
doi: 10.1617/2912143926.046