A simple method to measure the isosteric energy of adsorption

Journal Article · Wed Sep 15 04:00:00 EDT 2021 · Cement and Concrete Research

DOI:https://doi.org/10.1016/J.CEMCONRES.2021.106520· OSTI ID:23206235

Poyet, Stéphane; Touzé, Gaëtan ^[1]; Adia, Jean-Luc; Charpin, Laurent ^[2]; Michel-Ponnelle, Sylvie ^[3]

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1. Université Paris-Saclay, CEA, Service d'Etude du Comportement des Radionucléides, 91191 Gif-sur-Yvette (France)
2. EDF Lab les Renardières, avenue des Renardières, Ecuelles, 77818 Moret-sur-Loing (France)
3. EDF Lab Paris-Saclay, Boulevard Gaspard Monge, 91120, Palaiseau (France)

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.

• OSTI ID: 23206235
• Journal Information: Cement and Concrete Research, Journal Name: Cement and Concrete Research Vol. 147; ISSN 0008-8846; ISSN CCNRAI
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ADSORPTION
CEMENTS
DESORPTION
HUMIDITY
ISOTHERMS
MONITORING
TEMPERATURE DEPENDENCE
WATER VAPOR