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Development of a multi-species mass transport model for concrete with account to thermodynamic phase equilibriums
Taiheiyo Cement Corporation, Japan.
Taiheiyo Cement Corporation, Japan ; Taiheiyo Consultant Co, Japan.
Technical University of Denmark, Denmark.
University of Lund.
2011 (English)In: Materials and Structures, ISSN 1359-5997, E-ISSN 1871-6873, Vol. 44, no 9, p. 1577-1592Article in journal (Refereed) Published
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Abstract [en]

In this study, a coupled multi-species transport and chemical equilibrium model has been established. The model is capable of predicting time dependent variation of pore solution and solid-phase composition in concrete. Multi-species transport approaches, based on the Poisson–Nernst–Planck (PNP) theory alone, not involving chemical processes, have no real practical interest since the chemical action is very dominant for cement based materials. Coupled mass transport and chemical equilibrium models can be used to calculate the variation in pore solution and solid-phase composition when using different types of cements. For example, the physicochemical evaluation of steel corrosion initiation can be studied by calculating the molar ratio of chloride ion to hydroxide ion in the pore solution. The model can, further, for example, calculate changes of solid-phase composition caused by the penetration of seawater into the concrete cover. The mass transport part of the model is solved using a non-linear finite element approach adopting a modified Newton–Raphson technique for minimizing the residual error at each time step of the calculation. The chemical equilibrium part of the problem is solved by using the PHREEQC program. The coupling between the transport part and chemical part of the problem is tackled by using a sequential operator splitting technique and the calculation results are verified by comparing the elemental spacial distribution in concrete measured by the electron probe microanalysis (EPMA).

Place, publisher, year, edition, pages
2011. Vol. 44, no 9, p. 1577-1592
Keywords [en]
PHREEQC, Thermodynamic phase equilibrium, Mass transport, Multi-species, [Cl-]/[OH-]
National Category
Construction Management
Identifiers
URN: urn:nbn:se:lnu:diva-48710DOI: 10.1617/s11527-011-9720-2OAI: oai:DiVA.org:lnu-48710DiVA, id: diva2:893454
Available from: 2016-01-12 Created: 2016-01-12 Last updated: 2017-11-30Bibliographically approved

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Johannesson, Björn

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  • apa
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