ABOUT THE INTERNATIONAL CONCRETE ABSTRACTS PORTAL

  • The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.

International Concrete Abstracts Portal

  


Title: Monitoring Fiber Dispersion in Fiber-Reinforced Cementitious Materials: Comparison of AC-Impedance Spectroscopy and Image Analysis

Author(s): Nilufer Ozyurt, Leta Y. Woo, Thomas O. Mason, and Surendra P. Shah

Publication: Materials Journal

Volume: 103

Issue: 5

Appears on pages(s): 340-347

Keywords: fiber-reinforced cementitious materials; fibers; testing

DOI: 10.14359/18156

Date: 9/1/2006

Abstract:
Fiber dispersion is an important factor that affects both the fresh and hardened state properties of cement-based materials. While there are some well-studied, fundamental methods for monitoring fiber dispersion, most of them are destructive and time-consuming. Previous work has shown that AC-impedance spectroscopy (AC-IS) can be used as an effective tool for nondestructively monitoring fiber dispersion in both the fresh and hardened states of fiber-reinforced cementitious (FRC) materials. AC-IS was found to be sensitive to different dispersion phenomena. In this study, fiber clumping and orientation were studied using image analysis to verify the AC-IS measurements. The results of the two methods agreed well within experimental uncertainty, suggesting that AC-IS can be used as a nondestructive and rapid method for monitoring fiber dispersion in cementitious materials.