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 language | English (US) |
|---|---|
| Pages (from-to) | 189-195 |
| Number of pages | 7 |
| Journal | Journal of Electroceramics |
| Volume | 7 |
| Issue number | 3 |
| DOIs | |
| State | Published - Dec 2001 |
Keywords
- Cement
- Composites
- Electrical conductivity
- Fibers
- Impedance
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Ceramics and Composites
- Condensed Matter Physics
- Mechanics of Materials
- Electrical and Electronic Engineering
- Materials Chemistry