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Journal Articles Cement and Concrete Research Year : 2021

A simple method to measure the isosteric energy of adsorption

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Stéphane Poyet
Jean-Luc Adia
  • Function : Author
EDF
Laurent Charpin
  • Function : Author
  • PersonId : 769560
  • IdRef : 172332702
EDF
Sylvie Michel-Ponnelle
EDF

Abstract

The effect of temperature on water vapour desorption isotherms can be described simply using the Clausius-Clapeyron equation and the isosteric energy of adsorption, the latter conventionally estimated using two (or more) isotherms obtained at different temperatures. This approach has some disadvantages, however, and this article puts forward a simple alternative methodology for characterising this isosteric energy experimentally. Our method is based on monitoring the relative humidity of a cementitious material heated under sealed conditions. The evolution of the relative humidity as a function of temperature makes it possible to directly evaluate the isosteric energy. In practice, the tests are performed using a cell of the type that is used for self-desiccation studies.
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Dates and versions

cea-03293409 , version 1 (21-07-2021)

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Stéphane Poyet, Gaëtan Touzé, Jean-Luc Adia, Laurent Charpin, Sylvie Michel-Ponnelle. A simple method to measure the isosteric energy of adsorption. Cement and Concrete Research, 2021, 147, pp.106520. ⟨10.1016/j.cemconres.2021.106520⟩. ⟨cea-03293409⟩
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