Quantitative evaluation technique of Polyvinyl Alcohol (PVA) fiber dispersion in engineered cementitious composites

The fiber dispersion in fiber-reinforced cementitious composites is a crucial factor with respect to achieving desired mechanical performance. However, evaluation of the fiber dispersion in the composite Polyvinyl Alcohol-Engineered Cementitious Composite (PVA-ECC) is extremely challenging because of the low contrast of PVA fibers with the cement-based matrix. In the present work, a new evaluation technique is developed and demonstrated. Using a fluorescence technique on PVA-ECC, PVA fibers are observed as green dots in the cutting plane of the composite. After capturing the fluorescence image with a Charged Couple Device (CCD) camera through a microscope, the fiber dispersion is evaluated using image processing and statistical tools. In the image processing step, the fibers are more accurately detected by employing a series of processes based on categorization, watershed segmentation, and morphological reconstruction. Test results showed that the dispersion coefficient alpha(f) was calculated reasonably and the fiber-detection performance was enhanced. (C) 2009 Elsevier Ltd. All rights reserved.
Publisher
ELSEVIER SCI LTD
Issue Date
2009-07
Language
ENG
Keywords

IMAGE-ANALYSIS; PERFORMANCE; ALGORITHM; TENSILE; ECC

Citation

CEMENT & CONCRETE COMPOSITES, v.31, no.6, pp.408 - 417

ISSN
0958-9465
DOI
10.1016/j.cemconcomp.2009.04.002
URI
http://hdl.handle.net/10203/10953
Appears in Collection
CE-Journal Papers(저널논문)
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