Prediction of water vapour sorption isotherms and microstructure of hardened Portland cement pastes

Water vapour sorption isotherms of cementitious materials reflect the multi-scale physical microstructure through its interaction with moisture. Our ability to understand and predict adsorption and desorption behaviour is essential in the application of modern performance-based approaches to durabil...

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Bibliographic Details
Published in:Cement and concrete research 2016-03, Vol.81, p.134-150
Main Authors: de Burgh, James M., Foster, Stephen J., Valipour, Hamid R.
Format: Article
Language:English
Subjects:
(B) Microstructure
(B) Surface area
(C) Adsorption
(D) Portland cement
(E) Modelling
ADSORPTION
BASES
Cements
DESORPTION
DIFFERENTIAL EQUATIONS
FORECASTING
HARDNESS
HYDRATION
ISOTHERMS
MATERIALS SCIENCE
Mathematical models
MICROSTRUCTURE
Moisture
NUCLEAR MAGNETIC RESONANCE
PORTLAND CEMENT
Portland cements
SIMULATION
Sorption
Vapour
WATER
WATER INFLUX
WATER VAPOR
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Summary:Water vapour sorption isotherms of cementitious materials reflect the multi-scale physical microstructure through its interaction with moisture. Our ability to understand and predict adsorption and desorption behaviour is essential in the application of modern performance-based approaches to durability analysis, along with many other areas of hygro-mechanical and hygro-chemo-mechanical behaviour. In this paper, a new physically based model for predicting water vapour sorption isotherms of arbitrary hardened Portland cement pastes is presented. Established thermodynamic principles, applied to a microstructure model that develops with hydration, provide a rational basis for predictions. Closed-form differentiable equations, along with a rational consideration of hysteresis and scanning phenomena, makes the model suitable for use in numerical moisture simulations. The microstructure model is reconciled with recently published 1H NMR and mercury intrusion porosimetry results.
ISSN:0008-8846
1873-3948
DOI:10.1016/j.cemconres.2015.11.009