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Use of a multi-species reactive transport model to simulate chloride ingress in mortar exposed to NaCl solution or sea-water
Technical University of Denmark, Denmark.
Norwegian University of science and Technology, Norway.
Technical University of Denmark, Denmark.
Norwegian University of science and Technology, Norway.
2015 (English)In: Computational materials science, ISSN 0927-0256, E-ISSN 1879-0801, Vol. 105, 75-82 p.Article in journal (Refereed) Published
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Text
Abstract [en]

Simulations of ion ingress in Portland cement mortar using a multi-species reactive mass transport model are compared with experimental test results. The model is an extended version of the Poisson–Nernst–Planck equations, accounting for chemical equilibrium. Saturated mortar samples were exposed after 8 days of hydration to a NaCl-solution or natural sea-water in a laboratory controlled environment for the experimental part. The samples were analyzed for the total chloride content after 21, 90 and 180 days of exposure, at varying depths from the exposed surface. The applicability of the reactive mass transport model is shown by comparing the simulation and experimental results. The tortuosity factor used in the simulations is adjusted to obtain the best reproduction of the experimental results. The model predicts the total chloride content satisfactorily, despite assumptions in the simulation like fixed hydration degree over time. Improvements and suggestions for further development of the model are discussed, e.g. extended hydration description, improved overall chemical description and a more strict use of the tortuosity factor.

Place, publisher, year, edition, pages
2015. Vol. 105, 75-82 p.
Keyword [en]
Numerical modeling, Cement, Ion ingress
National Category
Construction Management
Research subject
Technology (byts ev till Engineering), Civil engineering
Identifiers
URN: urn:nbn:se:lnu:diva-48689DOI: 10.1016/j.commatsci.2015.04.023OAI: oai:DiVA.org:lnu-48689DiVA: diva2:893415
Available from: 2016-01-12 Created: 2016-01-12 Last updated: 2016-01-18Bibliographically approved

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CiteExportLink to record
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Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf