Dielectric capacity, liquid water content, and pore structure of thawing–freezing materials

A capacitive sensor-based experimental approach is worked out to study the ice/water phase change in cohesive porous media subject to freezing and thawing. This technique relies upon the dielectric properties of liquid water, ice, air, and mineral substrate in the radio-frequency range. A semi-empir...

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Bibliographic Details
Published in:Cold regions science and technology 2006, Vol.44 (1), p.52-66
Main Authors: Fabbri, Antonin, Fen-Chong, Teddy, Coussy, Olivier
Format: Article
Language:English
Subjects:
Capacitive method
Cement
Dielectric
Earth sciences
Earth, ocean, space
Engineering and environment geology. Geothermics
Engineering geology
Engineering Sciences
Exact sciences and technology
Fluid mechanics
Fluids mechanics
Freezing
Liquid water amount
Mechanics
Physics
Pore size distribution
Porous media
Sorption/desorption isotherm
Specific surface
Supercooling
Thawing
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Summary:A capacitive sensor-based experimental approach is worked out to study the ice/water phase change in cohesive porous media subject to freezing and thawing. This technique relies upon the dielectric properties of liquid water, ice, air, and mineral substrate in the radio-frequency range. A semi-empirical method based upon the Lichtenecker model and combining drying and freezing tests provides an accurate estimation of the liquid water content versus the temperature in freezing cement pastes. This estimation is further analysed with the help of thermoporometry concepts in order to characterize the pore size distribution and the specific surface area. The results range in the same order of magnitude as those assessed from gravimetric sorption/desorption isotherms.
ISSN:0165-232X
1872-7441
DOI:10.1016/j.coldregions.2005.07.001