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Estimation of Effective Diffusion Coefficients and Non-linear Binding Parameters of Chloride by Reverse Analysis of Chloride Profiles
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2006 (English)In: SP-234: Seventh CANMET/ACI International Conference on Durability of Concrete / [ed] VM Malhotra, Montreal, Canada: American Concrete Institute, 2006, 39-52 p.Conference paper, Published paper (Refereed)
Abstract [en]

Instead of the conventional method for evaluating an apparent diffusion coefficient of chloride ions (Cl-) from experimental Cl- concentration profile, this study introduces a novel method to estimate an effective diffusion coefficient (De) and non-linear binding parameters (a, b) of Cl- from a Cl- concentration profiles measured by electron probe micro analysis (EPMA). This estimation is made by the combination of numerical analysis by the finite-difference method of the non-linear diffusion equation and optimizing calculations. By using this method, De, a and b are estimated for several kinds of concrete having various type of cement and several levels of water-cement ratio. The estimated values of De show a positive linear relationship with values of De obtained by migration tests. The estimated values of a show a good correlation with the alumina content in cement as expected. These results indicate the validity of this method for estimating parameters required for predicting future Cl- concentration profiles.

Place, publisher, year, edition, pages
Montreal, Canada: American Concrete Institute, 2006. 39-52 p.
Keyword [en]
chloride, chloride binding, effective diffusion coefficient, EPMA, finite-difference method, numerical calculation, reverse analysis
National Category
Building Technologies
Research subject
Technology (byts ev till Engineering), Civil engineering
Identifiers
URN: urn:nbn:se:lnu:diva-49090ISBN: 9780870312076 (print)OAI: oai:DiVA.org:lnu-49090DiVA: diva2:896122
Conference
Seventh CANMET/ACI International Conference
Available from: 2016-01-20 Created: 2016-01-20 Last updated: 2016-05-02Bibliographically approved

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Johannesson, Björn
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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