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Diffusion of a mixture of cations and anions dissolved in water
Lund Institute of Technology.
1999 (English)In: Cement and Concrete Research, ISSN 0008-8846, E-ISSN 1873-3948, Vol. 29, no 8, 1261-1270 p.Article in journal (Refereed) Published
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Text
Abstract [en]

In service life modeling of concrete, the ion transport in the pore solution is crucial. The main deterioration phenomena associated with ions in the pore solution are (1) corrosion due to external chloride ions reaching the embedded reinforcement bars; (2) carbonation due to presence of dissolved carbon dioxide (which will form carbonic acid with water) supplied from the surrounding air. and (3) leaching of hydroxide ions from the pore solution to the surrounding environment. Models dealing with diffusion of ions are usually based on the mass balance equations for the individual diffusing ions together with constitutive relations for the mass density flows and for the mass exchange among the constituents. The important consequences of electroneutrality among the diffusing ions, however, is often omitted in models dealing with diffusion of ions in the pore solution of concrete. Here a method will be examined that allows diffusion of different ions in water, which satisfies both the electroneutrality requirement and the mass balance laws. For simplicity the effect of built-up electric double layers on the charged pore walls will not be treated.

Place, publisher, year, edition, pages
1999. Vol. 29, no 8, 1261-1270 p.
Keyword [en]
Diffusion, Carbonation, Leaching, Pore solution, Surface layer
National Category
Construction Management
Identifiers
URN: urn:nbn:se:lnu:diva-48741DOI: 10.1016/s0008-8846(99)00114-3OAI: oai:DiVA.org:lnu-48741DiVA: diva2:893499
Available from: 2016-01-12 Created: 2016-01-12 Last updated: 2016-01-18Bibliographically approved

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Citation style
  • apa
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  • nn-NO
  • nn-NB
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  • Other locale
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  • text
  • asciidoc
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