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Effective and Apparent Diffusion Coefficients of Chloride Ions and Chloride Binding Kinetics Parameters in Mortars: Non-Stationary Diffusion–Reaction Model and the Inverse Problem

A non-equilibrium diffusion–reaction model is proposed to describe chloride transport and binding in cementitious materials. A numerical solution for this non-linear transport with reaction problem is obtained using the finite element method. The effective chloride diffusion coefficients and paramet...

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Autores principales: Jasielec, Jerzy J., Stec, Jakub, Szyszkiewicz-Warzecha, Krzysztof, Łagosz, Artur, Deja, Jan, Lewenstam, Andrzej, Filipek, Robert
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7730095/
https://www.ncbi.nlm.nih.gov/pubmed/33287334
http://dx.doi.org/10.3390/ma13235522
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author Jasielec, Jerzy J.
Stec, Jakub
Szyszkiewicz-Warzecha, Krzysztof
Łagosz, Artur
Deja, Jan
Lewenstam, Andrzej
Filipek, Robert
author_facet Jasielec, Jerzy J.
Stec, Jakub
Szyszkiewicz-Warzecha, Krzysztof
Łagosz, Artur
Deja, Jan
Lewenstam, Andrzej
Filipek, Robert
author_sort Jasielec, Jerzy J.
collection PubMed
description A non-equilibrium diffusion–reaction model is proposed to describe chloride transport and binding in cementitious materials. A numerical solution for this non-linear transport with reaction problem is obtained using the finite element method. The effective chloride diffusion coefficients and parameters of the chloride binding are determined using the inverse method based on a diffusion–reaction model and experimentally measured chloride concentrations. The investigations are performed for two significantly different cements: ordinary Portland and blast furnace cements. The results are compared with the classical diffusion model and appropriate apparent diffusion coefficients. The role of chloride binding, with respect to the different binding isotherms applied, in the overall transport of chlorides is discussed, along with the applicability of the two models. The proposed work allows the determination of important parameters that influence the longevity of concrete structures. The developed methodology can be extended to include more ions, electrostatic interactions, and activity coefficients for even more accurate estimation of the longevity.
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spelling pubmed-77300952020-12-12 Effective and Apparent Diffusion Coefficients of Chloride Ions and Chloride Binding Kinetics Parameters in Mortars: Non-Stationary Diffusion–Reaction Model and the Inverse Problem Jasielec, Jerzy J. Stec, Jakub Szyszkiewicz-Warzecha, Krzysztof Łagosz, Artur Deja, Jan Lewenstam, Andrzej Filipek, Robert Materials (Basel) Article A non-equilibrium diffusion–reaction model is proposed to describe chloride transport and binding in cementitious materials. A numerical solution for this non-linear transport with reaction problem is obtained using the finite element method. The effective chloride diffusion coefficients and parameters of the chloride binding are determined using the inverse method based on a diffusion–reaction model and experimentally measured chloride concentrations. The investigations are performed for two significantly different cements: ordinary Portland and blast furnace cements. The results are compared with the classical diffusion model and appropriate apparent diffusion coefficients. The role of chloride binding, with respect to the different binding isotherms applied, in the overall transport of chlorides is discussed, along with the applicability of the two models. The proposed work allows the determination of important parameters that influence the longevity of concrete structures. The developed methodology can be extended to include more ions, electrostatic interactions, and activity coefficients for even more accurate estimation of the longevity. MDPI 2020-12-03 /pmc/articles/PMC7730095/ /pubmed/33287334 http://dx.doi.org/10.3390/ma13235522 Text en © 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Jasielec, Jerzy J.
Stec, Jakub
Szyszkiewicz-Warzecha, Krzysztof
Łagosz, Artur
Deja, Jan
Lewenstam, Andrzej
Filipek, Robert
Effective and Apparent Diffusion Coefficients of Chloride Ions and Chloride Binding Kinetics Parameters in Mortars: Non-Stationary Diffusion–Reaction Model and the Inverse Problem
title Effective and Apparent Diffusion Coefficients of Chloride Ions and Chloride Binding Kinetics Parameters in Mortars: Non-Stationary Diffusion–Reaction Model and the Inverse Problem
title_full Effective and Apparent Diffusion Coefficients of Chloride Ions and Chloride Binding Kinetics Parameters in Mortars: Non-Stationary Diffusion–Reaction Model and the Inverse Problem
title_fullStr Effective and Apparent Diffusion Coefficients of Chloride Ions and Chloride Binding Kinetics Parameters in Mortars: Non-Stationary Diffusion–Reaction Model and the Inverse Problem
title_full_unstemmed Effective and Apparent Diffusion Coefficients of Chloride Ions and Chloride Binding Kinetics Parameters in Mortars: Non-Stationary Diffusion–Reaction Model and the Inverse Problem
title_short Effective and Apparent Diffusion Coefficients of Chloride Ions and Chloride Binding Kinetics Parameters in Mortars: Non-Stationary Diffusion–Reaction Model and the Inverse Problem
title_sort effective and apparent diffusion coefficients of chloride ions and chloride binding kinetics parameters in mortars: non-stationary diffusion–reaction model and the inverse problem
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7730095/
https://www.ncbi.nlm.nih.gov/pubmed/33287334
http://dx.doi.org/10.3390/ma13235522
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