A1 Vertaisarvioitu alkuperäisartikkeli tieteellisessä lehdessä
Effective and Apparent Diffusion Coefficients of Chloride Ions and Chloride Binding Kinetics Parameters in Mortars: Non-Stationary Diffusion-Reaction Model and the Inverse Problem
Tekijät: Jasielec JJ, Stec J, Szyszkiewicz-Warzecha K, Lagosz A, Deja J, Lewenstam A, Filipek R
Kustantaja: MDPI
Julkaisuvuosi: 2020
Journal: Materials
Tietokannassa oleva lehden nimi: MATERIALS
Lehden akronyymi: MATERIALS
Artikkelin numero: ARTN 5522
Vuosikerta: 13
Numero: 23
Sivujen määrä: 23
DOI: https://doi.org/10.3390/ma13235522
Tiivistelmä
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.
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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