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Application of water vapor sorption measurements for porosity characterization of hardened cement pastes
Technical University of Denmark, Denmark.
Technical University of Denmark, Denmark.
Norwegian University of Science and Technology, Norway.
2014 (English)In: Construction and Building Materials, ISSN 0950-0618, E-ISSN 1879-0526, Vol. 66, 621-633 p.Article in journal (Refereed) Published
Resource type
Text
Abstract [en]

Water vapor sorption can be used to study important properties of porous materials including specific surface area and pore size distribution (PSD). However, the data analysis is somewhat inconsistent in literature. In this work, the important factors influencing the analyzed results using sorption data were reviewed. Water vapor sorption measurements were then applied to two hardened cement pastes and one model porous material MCM-41. The specific surface area was calculated based on different equations accounting for multilayer adsorption and the PSD was analyzed from both the absorption and the desorption isotherms for comparison: The calculated specific surface area was quite dependent on which equation is considered for multilayer adsorption. For the studied hardened cement pastes, three characteristic peaks were found in the calculated PSD curves from the desorption isotherms with corresponding radii of 1.4, 1.8 and 3.0 nm while the peak at 1.4 nm was missing in the PSD curves calculated from the absorption isotherm. The network theory, suggesting desorption is controlled by the pore entry sizes while absorption is controlled by the interior pore sizes, can be used to explain some of the results.

Place, publisher, year, edition, pages
2014. Vol. 66, 621-633 p.
Keyword [en]
Microstructure, Specific surface area, Pore size distribution, Adsorption, Cement paste, Network theory
National Category
Civil Engineering
Research subject
Technology (byts ev till Engineering), Civil engineering
Identifiers
URN: urn:nbn:se:lnu:diva-48691DOI: 10.1016/j.conbuildmat.2014.06.004OAI: oai:DiVA.org:lnu-48691DiVA: diva2:893426
Available from: 2016-01-12 Created: 2016-01-12 Last updated: 2016-02-12Bibliographically approved

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CiteExportLink to record
Permanent link

Direct link
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