Moisture diffusion in cementitious materials Adsorption isotherms

Yunping Xi, Zdeněk P. Bažant*, Hamlin M. Jennings

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

215 Scopus citations


This article describes an improvement on a previous model proposed by Bažant and Najjar, in which moisture diffusivity and moisture capacity are treated as separate parameters. These parameters are evaluated from independent test results, and are shown to depend on the water:cement ratio, curing time, temperature, and cement type. The moisture capacity is obtained as the slope of the adsorption isotherm. A mathematical model is developed and is shown to predict experimental adsorption isotherms of Portland cement paste very well. In the present form, the model is not applicable to high temperatures.

Original languageEnglish (US)
Pages (from-to)248-257
Number of pages10
JournalAdvanced Cement Based Materials
Issue number6
StatePublished - Nov 1994


  • Adsorption
  • Concrete
  • Hardened cement paste
  • Moisture diffusion
  • Moisture effects
  • Permeability
  • Porosity

ASJC Scopus subject areas

  • Ceramics and Composites
  • Industrial and Manufacturing Engineering

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