Abstract
A novel method is developed to evaluate fiber dispersion issues in short (or discontinuous) fiber-reinforced cement composites. Fiber orientation, global segregation (i.e., as a result of gravitational settling or improper mixing), and local aggregation (i.e., small fiber agglomerates distributed uniformly throughout the matrix) are quantified using an electrical measurement technique. The method is based on AC-Impedance Spectroscopy (AC-IS) and uses the intrinsic conductivity approach to characterize fiber dispersion through a process that is able to isolate some of the effects. A flow chart is developed to describe the method, which consists of 3D AC-IS measurements, a point probe technique, and a dispersion factor (DF) analysis.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 627-636 |
| Number of pages | 10 |
| Journal | Cement and Concrete Composites |
| Volume | 27 |
| Issue number | 6 |
| DOIs | |
| State | Published - Jul 2005 |
Funding
The authors gratefully acknowledge the assistance of Edward J. Garboczi of the National Institute of Standards and Technology, Materials and Construction Research Division. This work was supported in part by the National Science Foundation under grant no. DMR-00-73197.
Keywords
- Electrical impedance spectroscopy
- Fiber dispersion
- Fiber orientation
- Steel fiber composites
ASJC Scopus subject areas
- Building and Construction
- General Materials Science