A capacitive sensor-based apparatus has been used to study the ice/water phase change in consolidated porous media subjected to freezing and thawing. This technique relies on the dielectric properties of water, ice, air, and the mineral substrate in the radio-frequency range. It gives directly the freezing and thawing temperature depressions and indirectly provides an estimation of pore size distribution through the Gibbs–Thomson relation. It also holds good promise for evaluating the amount of liquid water in frozen porous media by combining drying and freezing tests.
À l'aide d'un dispositif de sonde capacitive, on étudie le changement de phase eau/glace dans des milieux poreux consolidés soumis au gel et dégel. Cette technique exploite les propriétés diélectriques de l'eau, de la glace, de l'air, et du substrat minéral dans la gamme des fréquences radio. Elle permet d'obtenir directement les abaissements des températures de solidification et de fusion et indirectement la distribution des tailles de pores via la relation de Gibbs–Thomson. Elle devrait aussi fournir un moyen d'évaluer la teneur en eau liquide dans un milieu poreux en combinant un test en séchage et en gel.
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Mots-clés : Milieux poreux, Gel, Dégel, Eau non-gelée, Surfusion, Capteur capacitif, Diélectrique, Ciment
Teddy Fen-Chong 1; Antonin Fabbri 1
@article{CRMECA_2005__333_5_425_0, author = {Teddy Fen-Chong and Antonin Fabbri}, title = {Freezing and thawing porous media: experimental study with a dielectric capacitive method}, journal = {Comptes Rendus. M\'ecanique}, pages = {425--430}, publisher = {Elsevier}, volume = {333}, number = {5}, year = {2005}, doi = {10.1016/j.crme.2005.01.007}, language = {en}, }
TY - JOUR AU - Teddy Fen-Chong AU - Antonin Fabbri TI - Freezing and thawing porous media: experimental study with a dielectric capacitive method JO - Comptes Rendus. Mécanique PY - 2005 SP - 425 EP - 430 VL - 333 IS - 5 PB - Elsevier DO - 10.1016/j.crme.2005.01.007 LA - en ID - CRMECA_2005__333_5_425_0 ER -
Teddy Fen-Chong; Antonin Fabbri. Freezing and thawing porous media: experimental study with a dielectric capacitive method. Comptes Rendus. Mécanique, Volume 333 (2005) no. 5, pp. 425-430. doi : 10.1016/j.crme.2005.01.007. https://comptes-rendus.academie-sciences.fr/mecanique/articles/10.1016/j.crme.2005.01.007/
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