Monitoring fiber dispersion in fiber-reinforced cementitious materials: Comparison of AC-impedance spectroscopy and image analysis

Nilufer Ozyurt; Leta Y. Woo; Thomas O. Mason; Surendra P. Shah

Monitoring fiber dispersion in fiber-reinforced cementitious materials: Comparison of AC-impedance spectroscopy and image analysis

Nilufer Ozyurt, Leta Y. Woo, Thomas O. Mason, Surendra P. Shah

Northwestern University

Research output: Contribution to journal › Article › peer-review

71 Citations (Scopus)

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.

Original language	English
Pages (from-to)	340-347
Number of pages	8
Journal	ACI Materials Journal
Volume	103
Issue number	5
Publication status	Published - Sep 1 2006

Keywords

Fiber-reinforced cementitious materials
Fibers
Testing

ASJC Scopus subject areas

Civil and Structural Engineering
Building and Construction
Materials Science(all)

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AU - Ozyurt, Nilufer

AU - Woo, Leta Y.

AU - Mason, Thomas O.

AU - Shah, Surendra P.

PY - 2006/9/1

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AB - 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.

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Monitoring fiber dispersion in fiber-reinforced cementitious materials: Comparison of AC-impedance spectroscopy and image analysis

Abstract

Keywords

ASJC Scopus subject areas

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