Freezing of water in portland cement paste - an ac impedance spectroscopy study

被引：24
|
作者：
Perron, S
Beaudoin, JJ
机构：
[1] Univ Ottawa, Dept Civil Engn, Ottawa, ON K1N 6N5, Canada
[2] CNR, Inst Res Construct, Ottawa, ON K1R 0R6, Canada
来源：
CEMENT & CONCRETE COMPOSITES | 2002年 / 24卷 / 05期
关键词：
freezing; cement paste; impedance; depression angle;
D O I：
10.1016/S0958-9465(01)00078-6
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
The freezing of water in portland cement paste was investigated using ac impedance spectroscopy (ACIS) techniques. Length change and impedance measurements on cooling and warming were obtained simultaneously using a specially designed coupling technique. A new descriptor of frost resistance is described in terms of the high-frequency arc (HFA) depression angle in the impedance plane. Curves of the depression angle parameter phi versus temperature are shown to be indicative of the pore structure and its effect on mass transfer of water and nucleation and growth of ice crystals. The phi-temperature and resistance-temperature curves are used in combination to assess structural damage. Results are compared with those obtained for model pore systems, i.e., Vycor glass and clay brick. (C) 2002 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码：467 / 475
页数：9
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