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Gas retention phenomenon in dry or partially-saturated concrete: permeability assessment

type de publication      communication internationale avec actes publiés
date de publication 05-06-2008
auteur(s) Chen Xiaoting; Chen Wei; Davy Catherine A.; Agostini Franck; Skoczylas Frédéric
conférence 3rd International Conference on Coupled THMC Processes in Geo-Systems, GEOPROC 2008
     dates de 01-06-2008 à 05-06-2008
     lieu Polytech'Lille, Cité Scientifique, 59655 Villeneuve d'Ascq, France
     nom des actes Thermo-Hydromechanical and Chemical Coupling in Geomaterials and Applications, Edited by J-F Shao and N Burlion, Wiley & Sons, USA
pages 151 – 159
ISBN / ISSN 978-1-84821-043-1
résumé This study is an original contribution to the understanding of the hydraulic behaviour of cement-based materials when subjected to high temperatures. For two given concretes, gas permeability experiments have been conducted continuously, while heating a representative sample up to 200°C. Gas retention is evidenced, depending on the sample size (scale effect), water saturation level Sw, and heating rate. Intrinsic permeability Kint and Klinkenberg coefficient beta are also evaluated at stabilized temperature levels of 60, 105 or 200°C. Complementarily to Mercury Intrusion Porosimetry (MIP) results, beta values support the interpretation of appreciable microstructure modifications due to heating. As a conclusion, observed phenomena at the laboratory scale testify of potentially strong gas retention effects upon engineering structures subjected to high temperature gradients.
mots clés transport properties, concrete, gas retention, moisture clog effect, temperature gradient, gas permeability, scale effect
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