Frequency-dependent electrical mixing law behavior in spherical particle composites

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

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

The electrical properties of cement-based composites with mono-size conductive (steel) or insulating (glass) spherical inclusions were investigated by combined 2-point impedance spectroscopy and 4-point dc resistance measurements. The matrix was ordinary Portland cement (w/c = 0.4; cured for 7 days). Particle loading was varied over an extended range to as high as 42% volume fraction. The steel particle composites behaved like the glass particle composites at dc and low ac frequencies; conductivity decreased with increasing particle loading. Under ac excitation, however, the steel particles were rendered conductive; conductivity increased dramatically with particle loading. The results were analyzed in terms of various mixing laws and effective media theories and the proposed "frequency-switchable coating model," which accounts for the unusual frequency-dependent behavior of the steel particle composites.

Original languageEnglish
Pages (from-to)49-56
Number of pages8
JournalJournal of Electroceramics
Volume9
Issue number1
DOIs
Publication statusPublished - Oct 2002

Fingerprint

Steel
composite materials
Composite materials
steels
Glass
cements
Portland cement
Volume fraction
Cements
Electric properties
Spectroscopy
conductivity
glass
Coatings
electrical properties
impedance
inclusions
low frequencies
coatings
matrices

Keywords

  • Cement
  • Composites
  • Electrical conductivity
  • Impedance
  • Mixing laws

ASJC Scopus subject areas

  • Ceramics and Composites

Cite this

Frequency-dependent electrical mixing law behavior in spherical particle composites. / Campo, M. A.; Woo, L. Y.; Mason, Thomas O; Garboczi, E. J.

In: Journal of Electroceramics, Vol. 9, No. 1, 10.2002, p. 49-56.

Research output: Contribution to journalArticle

Campo, M. A. ; Woo, L. Y. ; Mason, Thomas O ; Garboczi, E. J. / Frequency-dependent electrical mixing law behavior in spherical particle composites. In: Journal of Electroceramics. 2002 ; Vol. 9, No. 1. pp. 49-56.
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