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Gas permeability of macro-cracked concrete: effect of temperature and water saturation

type de publication      communication internationale avec actes publiés
date de publication 23-05-2010
auteur(s) Chen Wei; Skoczylas Frédéric
conférence 7th International Conference on Fracture Mechanics of Concrete and Concrete Structures, FraMCoS-7
     dates de 23-05-2010 à 27-05-2010
     lieu Seoul, South Korea
     nom des actes Proceedings of the International Conference on on Fracture Mechanics of Concrete and Concrete Structures FRAMCOS7, Edited by B. H. Oh et al.
pages 996 – 1002
ISBN / ISSN 978-89-5708-181-5
résumé This experimental work investigates the hydraulic behavior of a macro-cracked concrete, in order to improve the understanding of the coupled effects of temperature and water saturation. A concrete sample is macro-cracked using the Brazilian test technique. It is then submitted to dry or wet gas flow at different temperatures and confining pressures and its permeability is recorded. This first phase of the study clearly shows that confinement, which induces macro-crack closure, drives the first-order variation of permeability without any significant self-sealing of the crack, despite the wet gas injection. On another hand, injection of liquid water leads to a continuous decrease in flow rate. In a second phase, the permeability of intact, uncracked, material is measured under different moderate temperatures, which generates sample cooling or heating. This phase clearly demonstrates the importance of the sample initial saturation rate. Indeed, if the material is initially dry, temperature plays no role upon permeability, whereas it does if the material is initially partially water-saturated.
mots clés water saturation, gas permeability, concrete, temperature
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