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Pro048

Detection of fiber dispersion in fresh and hardened cement composites



Title: Detection of fiber dispersion in fresh and hardened cement composites
Author(s): Nilufer Ozyurt, Leta Y. Woo, Bin Mu, Surendra P. Shah, Thomas O. Mason
Paper category : conference
Book title: International RILEM Symposium on Concrete Science and Engineering: A Tribute to Arnon Bentur
Editor(s): J. Weiss, K. Kovler, J. Marchand, and S. Mindess
Print-ISBN: None
e-ISBN: 2912143926
Publisher: RILEM Publications SARL
Publication year: 2004
Nb references: 28
Language: English


Abstract: This study is a part of an ongoing project on the use of AC-Impedance Spectroscopy (AC-IS) to monitor dispersion of fibers in fiber-reinforced composites (FRCs). The main objective of the project is to develop AC-IS as a non-destructive tool for characterization of fiber dispersion at early ages of FRCs. For this purpose the ability of AC-IS to monitor different dispersion issues was studied. Dispersion issues were classified as preferred orientation, macro-scale segregation and micro-scale aggregation of fibers. AC-IS measurements were carried out on both fresh and hardened FRC samples. A new local probe method was introduced for monitoring macro-scale inhomogeneities in fiber distribution. A dispersion function, which was proposed in a previous paper [1], was employed to describe the level of dispersion for well-dispersed fibers with micro-scale inhomogeneities. Based on the experimental results, AC-IS is a promising technique for non-destructive evaluation of fiber dispersion in FRCs and is a potentially viable quality control method for FRCs at early ages.


Online publication: 2004-03-25
Classification: Mechanical Properties
Publication type : full_text
Public price (Euros): 0.00
doi: 10.1617/2912143926.087