Journal
CONSTRUCTION AND BUILDING MATERIALS
Volume 48, Issue -, Pages 656-661Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2013.07.052
Keywords
Fiber distribution; Micro-CT; Aggregate Image reconstruction; Cementitious composites
Categories
Funding
- National Basic Research Program of China (973 Program) [2010CB735801]
- National Natural Science Foundation of China [50908104]
- Foundation Research Project of Jiangsu Province [BK2011835]
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Fiber distribution in fiber reinforced cementitious composites (FRCC) is a critical factor affecting the reinforcement of fiber to composites. However, evaluation of fiber distribution in 3-dimension (3D) space has always been a great challenge due to the lack of transparency of FRCC and random distribution of fiber. To address this problem, micro-computed tomography (micro-CT) was used to characterize fiber distribution in this study, which permitted 3D visualization within the materials. By 3D image reconstruction, processing and analysis of CT images, the curves of fiber orientation distribution (FOD) and fiber spacing distribution (FSD) in cementitious composites can be obtained, and the orientation factor and dispersion coefficient of fiber can also be determined. The effect of aggregate size and content on fiber orientation distribution in cementitious composites is more obvious than that on fiber spacing distribution. Compared to conventional approach of 2D image analysis of cross-section of FRCC, the micro-CT image technique appears more intuitive and accurate, especially in the assessment of fiber dispersion.
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