Intrinsic conductivity of short conductive fibers in composites by impedance spectroscopy

被引：31
作者：
Hixson, AD [1 ]
Woo, LY
Campo, MA
Mason, TO
Garboczi, EJ
机构：
[1] Northwestern Univ, Dept Mat Sci & Engn, Evanston, IL 60208 USA
[2] Natl Inst Stand & Technol, Bldg Mat Div, Gaithersburg, MD 20899 USA
来源：
JOURNAL OF ELECTROCERAMICS | 2001年 / 7卷 / 03期
基金：
美国国家科学基金会;
关键词：
composites; fibers; electrical conductivity; impedance; cement;
D O I：
10.1023/A:1014487129118
中图分类号：
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Electrical property measurements (DC conductivity, impedance spectroscopy) were employed to determine the "intrinsic conductivities" of short conductive fibers in cement matrix composites. Intrinsic conductivity determines, in the dilute limit, the variation of overall conductivity (DC or AC) vs. volume fraction of fibers. Model composites consisting of steel wires (0.5 mm diameter), but with aspect ratios comparable to typical carbon or steel fibers used in cement/concrete, were shown to exhibit similar "dual-arc" impedance spectra as observed in actual composites. The results were compared with existing calculations for composites with randomly distributed right cylinders. The conductivity vs. aspect ratio behavior can be used to estimate the fiber aspect ratio in randomly distributed fiber composites.
引用
收藏
页码：189 / 195
页数：7
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