Intrinsic conductivity of short conductive fibers in composites by impedance spectroscopy

A. D. Hixson, L. Y. Woo, M. A. Campo, Thomas O Mason, E. J. Garboczi

Research output: Contribution to journalArticlepeer-review

26 Citations (Scopus)

Abstract

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 ration in randomly distributed fiber composites.

Original languageEnglish
Pages (from-to)189-195
Number of pages7
JournalJournal of Electroceramics
Volume7
Issue number3
DOIs
Publication statusPublished - Dec 2001

Keywords

  • Cement
  • Composites
  • Electrical conductivity
  • Fibers
  • Impedance

ASJC Scopus subject areas

  • Ceramics and Composites

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