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Title of article :
Quantitative evaluation technique of Polyvinyl Alcohol (PVA) fiber dispersion in engineered cementitious composites
Author/Authors :
Bang Yeon Lee، نويسنده , , Jin-Keun Kim، نويسنده , , Jeong-Su Kim، نويسنده , , Yun Yong Kim، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2009
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Abstract :
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 αf was calculated reasonably and the fiber-detection performance was enhanced.
Keywords :
Morphological reconstruction , Watershed segmentation , Fiber dispersion , PVA-ECC , Categorization
Journal title :
Cement and Concrete Composites
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Link To Document :