Electrically accelerated transport of chlorides in concrete considering non-linear chloride binding in non-equilibrium conditions

Przemek Spiesz, Jos Brouwers

Research output: Chapter in Book/Report/Conference proceedingChapterAcademicpeer-review

Abstract

The Rapid Chloride Migration test (NT Build 492) is commonly used in order to determine the chloride diffusion (migration) coefficient in concrete. This coefficient can then be used as the input value for service life design models for concrete structures in marine environment. However, the theoretical background of this test is still raising discussions as the equations describing the transport process of chlorides cannot predict correctly the chloride concentration profiles in concrete. The new, improved chloride transport model presented in this paper includes the nonlinear nature of chloride binding in concrete as well as the non-equilibrium conditions between free- and bound- chloride concentrations, which were not taken into account in the traditional chloride transport model. This new model has been applied to the experimental data and the values of binding parameters, chloride mass transfer coefficient and the effective chloride diffusion coefficient were determined in the optimization process. The derived binding parameters (non-linear Freundlich isotherm) show very good agreement with values obtained from experimental measurements. The chloride mass transfer coefficient reveals a tendency to diminish during the RCM test. The effective diffusion coefficient determined based on the new chloride transport model is in line with the values found in literature.

Original languageEnglish
Title of host publicationProceedings of the 4th International RILEM PhD Student Workshop on Modelling the Durability of Reinforced Concrete, 19 November 2010, Madrid, Spain
EditorsCarmen Andrade, Joost Gulikers
Place of PublicationMadrid
PublisherS.A.R.L.
Pages119-124
Number of pages6
ISBN (Print)978-94-007-2702-1
DOIs
Publication statusPublished - 1 Dec 2012
Eventconference; 4th International RILEM PhD Workshop on Advances in Modeling Concrete Service Life, Madrid 2010; 2010-11-19; 2010-11-19 -
Duration: 19 Nov 201019 Nov 2010

Publication series

NameRILEM Bookseries
Volume3
ISSN (Print)2211-0844
ISSN (Electronic)2211-0852

Conference

Conferenceconference; 4th International RILEM PhD Workshop on Advances in Modeling Concrete Service Life, Madrid 2010; 2010-11-19; 2010-11-19
Period19/11/1019/11/10
Other4th International RILEM PhD Workshop on Advances in Modeling Concrete Service Life, Madrid 2010

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