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Moisture diffusion in cementitious materials Adsorption isotherms

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

Abstract 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.

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Moisture diffusion in cementitious materials Adsorption isotherms

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

Abstract 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.

Moisture diffusion in cementitious materials Adsorption isotherms

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

Abstract 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.

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Title:

Moisture diffusion in cementitious materials Adsorption isotherms

Contributors:

Xi, Yunping (author) / Bažant, Zdeněk P. (author) / Jennings, Hamlin M. (author)

Published in:

Advanced Cement Based Materials ; 1 ; 248-257

Publication date:

1994-01-01

Size:

10 pages

ISSN:

DOI:

https://doi.org/10.1016/1065-7355(94)90033-7

Type of media:

Article (Journal)

Type of material:

Electronic Resource

Language:

English

Keywords:

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

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