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Method for simultaneous determination of sorption isotherms and diffusivity of cement-based materials

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Author

Summary, in English

A method for simultaneous determination of the diffusion and sorption properties of cement-based materials is presented. It is a gravimetric method where one small specimen is exposed to stepwise changes in relative humidity while its mass is being measured. As sorption in cement-based materials is slow, the change in relative humidity to the next level is made before final equilibrium has been reached on the previous level. Approximate final (equilibrium) levels are found by extrapolation using an exponential equation, and a factor is applied to correct for the fact that the sorption step does not start at equilibrium conditions. A correction for external mass transfer resistance is also included. The method can be used in desorption as well as absorption mode. Measurements of two materials are presented and compared with the results obtained using conventional methods.

Publishing year

2008

Language

English

Pages

89-94

Publication/Series

Cement and Concrete Research

Volume

vol 38

Issue

no 1

Document type

Journal article

Publisher

Elsevier

Topic

  • Materials Engineering

Keywords

  • Adsorption
  • Humidity
  • Sorption isotherm
  • Diffusion

Status

Published

ISBN/ISSN/Other

  • ISSN: 0008-8846