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Indirect assessment of hydraulic diffusivity and permeability for unsaturated cement-based material from sorptivity

type de publication      article dans une revue internationale avec comité de lecture
date de publication 2016
auteur(s) Zhou Chunsheng; Chen Wei; Wang Wei; Skoczylas Frédéric
journal (abréviation) Cement and Concrete Research (Cement Concr Res)
volume (numéro) 82
pages 117 – 129
résumé The hydraulic diffusivity, water permeability and relative gas permeability for cement-based materials are indirectly evaluated from measured sorptivity and water vapor sorption isotherms (WVSIs). The dependence of sorptivity on initial saturation degree is first established to help calculate hydraulic diffusivity and other transport properties. An experimental program with a self-scaled preconditioning strategy is also carefully designed and conducted on three concretes to measure their sorptivity, WVSIs as well as permeability to various fluids. It's found that hydraulic diffusivity of ambiguous physical significance may be not a good durability indicator. The predicted water permeability is larger than measured value but at the same order of magnitude. This overestimation is attributed to the required drying preconditioning. The predicted relative water permeability agrees well with reported data. However, the predicted relative gas permeability agrees with the measured data from classical CEMBUREAU method better than that from tri-axial permeameter with higher inlet gas pressure.
mots clés Concrete (E); Saturation degree (C); Sorptivity (C); Hydraulic diffusivity (C); Permeability (C)
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