Multiionic approaches to model chloride binding in cementitious materials

Title: Multiionic approaches to model chloride binding in cementitious materials
Author(s): Eric Samson, Jacques Marchand
Paper category : conference
Book title: 2nd International RILEM Symposium on Advances in Concrete through Science and Engineering
Editor(s): J. Marchand, B. Bissonnette, R. Gagné, M. Jolin and F. Paradis
Print-ISBN: 2-35158-003-6
e-ISBN: 2351580028
Publisher: RILEM Publications SARL
Publication year: 2006
Pages: 101 - 122
Total Pages: 22
Nb references: 43
Language: English

Abstract: The exposure to chlorides has long been identified as one of the major phenomena at the origin of the premature degradation of reinforced concrete structures. Although the penetration of chloride ions does not always lead to microstructural alterations that weaken concrete, it unfortunately often contributes to initiate steel corrosion. Over the past decades, ionic transport models have been developed in order to predict the service-life of structures and plan for proper maintenance. Early models were based on a single-ion equation. More recently, multiionic models, which allow for a more precise description of the ionic diffusion and chemical reaction mechanisms, have been proposed and used to predict the service-life of concrete structures. This paper presents the latest results in chloride diffusion modeling within the context of a multiionic approach. Two different techniques to account for binding mechanisms are discussed: dissolution/precipitation and ionic exchange processes. Numerical results are compared to experimental data obtained on various concrete mixtures.

Online publication: 2006-08-02
Classification: 2.1 Theme 1: Numerical Models: from Microstructure to Transport Properties and Durability
Publication type : full_text
Public price (Euros): 0.00
doi: 10.1617/2351580028.008