Effects of Fibre Type and Matrix Structure on the Mechanical Performance of Self-compacting Micro-concrete Composites

The compatibility of matrix and fiber properties is a key parameter in the successful design of fiber reinforced cementitious composites. In order to achieve the desired performance, the properties of each constituent of composite should be properly configured. The aim of this study was to investigate the performance of 2 polymer based micro-fibers (polypropylene and polyvinyl alcohol) in different matrices (high strength and comparatively low strength with fly ash incorporation) which were designed to contain considerably high amounts of fibers (1% by volume) while maintaining their self-compactability. The fresh state thixotropic behavior of fiber reinforced matrices was minimized by proper adjustment of water/cementitious material ratio and admixture dosage. The mechanical properties (first crack strength and displacement, flexural strength, and relative toughness) of prismatic composite samples were compared by 3 point flexural loading test. The typical behaviors of selected composites and collapse mechanisms of PP and PVA fibers in these matrices were characterized by microstructural studies. It was concluded that, a high strength matrix with a high strength fiber give the best performance from the view point of flexural strength and toughness performance. However, incorporation of fly ash did not cause a significant reduction in composite performance possibly due to its enhancing effect on matrix-fiber interface adhesion. The possibilities and suggestions to further improve the performance of the composites were also discussed.

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  • English

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  • Accession Number: 01146455
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Nov 24 2009 12:46PM