Modelling capillary effects on the reactive transport of chloride ions in cementitious materials

The transport of chloride ions in concrete structures is not only due to diffusion but also to the advective effects of water movements and capillarity, mostly present with wet-dry cycles. These last two phenomena are currently very poorly modelled. A new system based on optical fibres was previousl...

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Bibliographic Details
Published inCement and concrete research Vol. 131; p. 106033
Main Authors Sanchez, T., Conciatori, D., Laferriere, F., Sorelli, L.
Format Journal Article
LanguageEnglish
Published Elmsford Elsevier Ltd 01.05.2020
Elsevier BV
Subjects
Capillarity
Chloride
Chloride ions
Computer simulation
Concrete
Concrete structures
Ions
Numerical model
Numerical models
Optical fibers
Optical fibre sensor
PhreeqC
Concrete
Optical fibre sensor
Chloride
PhreeqC
Numerical model
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Summary:The transport of chloride ions in concrete structures is not only due to diffusion but also to the advective effects of water movements and capillarity, mostly present with wet-dry cycles. These last two phenomena are currently very poorly modelled. A new system based on optical fibres was previously developed to measure the free chloride concentration in the pore solution without damaging the material. This work aims at developing a numerical model simulating the reactive transport of chloride ions by capillarity in a cementitious material, which considers the diffusion of chloride ions and water transport by capillarity, as well as the chloride adsorption by the material with chemical interaction. It led to the analysis of the main phenomena occurring during a capillarity test. In a larger perspective, this study improves the current understanding of the durability of concrete structures exposed to severe environmental conditions.
ISSN:0008-8846
1873-3948
DOI:10.1016/j.cemconres.2020.106033