Dynamic determination of sorption isotherm of cement based materials

A dynamic method of determining sorption isotherm is proposed. Changes in humidity boundary conditions were applied to specimens of hardened cement paste having various water–cement ratios, as well as to autoclaved aerated concrete, and water adsorption rates were continuously recorded in a sufficie...

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Bibliographic Details
Published in:Cement and concrete research 2005-12, Vol.35 (12), p.2271-2277
Main Authors: Tada, Shinsaku, Watanabe, Kazumasa
Format: Article
Language:English
Subjects:
A: Humidity
Applied sciences
Buildings. Public works
C: Adsorption
C: Diffusion
Cement concrete constituents
Cements
Concretes. Mortars. Grouts
D: Cement paste
Exact sciences and technology
General (composition, classification, performance, standards, patents, etc.)
Materials
Properties and test methods
Properties of anhydrous and hydrated cement, test methods
Sorption isotherm
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Summary:A dynamic method of determining sorption isotherm is proposed. Changes in humidity boundary conditions were applied to specimens of hardened cement paste having various water–cement ratios, as well as to autoclaved aerated concrete, and water adsorption rates were continuously recorded in a sufficiently short period. The diffusion equation was analytically solved and was fitted to the adsorption rates resulting in the rapid estimation of equilibrium moisture content. Results of equilibrium moisture content, the primary data of moisture capacity, showed good agreement with literature values. The adsorption rate measurement took 8 h for autoclaved aerated concrete and 12 h for hardened cement paste with a measurement interval of 60 s to predict an equilibrium moisture content at an ambient relative humidity.
ISSN:0008-8846
1873-3948
DOI:10.1016/j.cemconres.2005.01.002