Identification of binding isotherm and prediction of chloride ingress into water saturated concrete by a numerical multi-species model

Author(s): T.Q. Nguyen, V. Baroghel-Bouny, P. Dangla, P. Belin
Paper category: Workshop
Book title: International RILEM Workshop on Integral Service Life Modelling of Concrete Structures
Editor(s): R.M. Ferreira, J. Gulikers, C. Andrade
Print ISBN: 978-2-35158-058-5
e-ISBN: 978-2-35158-090-5
Publisher: RILEM Publications SARL
Pages: 11 - 22
Total Pages: 12
Language: English

Abstract: 
Within the framework of the prediction of reinforced-concrete structure service life, a multi-level approach to model chloride ingress into concrete has been proposed. In such an approach, durability indicators are included as input data in the models. Within this framework, a multi-species transport model has been developed in saturated conditions (Cl-, OH-, Na+ and K+ are addressed) on the basis of the Nernst-Planck equation, and by using a finite volume method. Chloride binding is described in this model by Freundlich’s or Langmuir’s isotherm. In this paper, a method of assessment of the chloride binding isotherm by numerical inverse analysis is described and compared to direct measurement. A sensitivity analysis of the model is also provided. The validation of the model has been performed on the basis of a comparison between predicted chloride penetration depths and chloride concentration profiles and experimental data obtained on various types of materials and in various environmental conditions (diffusion tests under non-steady-state conditions and
marine exposure).

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