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Numerical modelling of moisture transfers with hysteresis in cementitious materials: Verification and investigation of the effects of repeated wetting–drying boundary conditions
Abstract : In natural environment, the cover layer of reinforced concrete structures is affected by periodic variations of external relative humidity (RH). However, most moisture transport models in the literature only focus on drying of materials. In this study, a method coupling a moisture transport model with any kind of hysteresis modelling is presented. Two hysteresis models (conceptual and empirical) have been implemented and compared. The scope of the study is limited to cyclic variations of RH with no direct contact with liquid water during the wetting steps. Experimental data verifications show that the conceptual approach yields better results than the empirical one. Comparisons of non-hysteresis and hysteresis modellings have been carried out for different cycle durations, RH amplitudes and initial moisture states. All comparisons and investigations enhance the necessity of considering hysteresis to quantify moisture transport under repeated drying-wetting boundary conditions.
Littérature citée [60 références]
https://hal-enpc.archives-ouvertes.fr/hal-01622016
Contributeur : Zhidong Zhang Connectez-vous pour contacter le contributeur
Soumis le : lundi 23 octobre 2017 - 23:46:56
Dernière modification le : mardi 8 décembre 2020 - 10:20:42
Contributeur : Zhidong Zhang Connectez-vous pour contacter le contributeur
Soumis le : lundi 23 octobre 2017 - 23:46:56
Dernière modification le : mardi 8 décembre 2020 - 10:20:42
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