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

Antonin Fabbri; Teddy Fen-Chong; Olivier Coussy

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

机译：解冻材料的介电常数，液体含水量和孔结构

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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.

机译：研究了基于电容传感器的实验方法，以研究粘性多孔介质中冻结和解冻后的冰/水相变化。该技术依赖于射频范围内的液态水，冰，空气和矿物基质的介电特性。基于Lichtenecker模型并结合了干燥和冷冻测试的半经验方法可以准确估计液态水泥浆中水含量与温度的关系。为了估计孔径分布和比表面积，借助热孔法概念进一步分析了这一估计。结果的范围与通过重量吸附/解吸等温线评估的结果处于相同的数量级。

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来源
《Cold regions science and technology》 |2006年第1期|p.52-66|共15页
作者
Antonin Fabbri; Teddy Fen-Chong; Olivier Coussy;
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作者单位

Institut Navier, LMSGC 2 allee Kepler-77420 Champs-sur-Marne, France;

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原文格式 PDF
正文语种 eng
中图分类工程物理学;
关键词
porous media; freezing; thawing; dielectric; capacitive method; supercooling; liquid water amount; pore size distribution; specific surface; sorption/desorption isotherm; cement;

机译：多孔介质;冻结;解冻;介电;电容法;过冷;液态水量;孔径分布;比表面积;吸附/解吸等温线;水泥;

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

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