Mechanical properties of PVA fiber reinforced cement composites fabricated by extrusion processing

Yixin Shao, Surendra P. Shah

Research output: Contribution to journalArticlepeer-review

81 Scopus citations

Abstract

Discontinuous polyvinyl alcohol (PVA) fiber reinforced cement matrix composites fabricated by extrusion process were investigated. The extruded composites have exhibited a postpeak strain hardening type of response with an enhanced composite strength. Tensile strength of extruded composites was dependent on the fiber fraction used, while the flexural strength and deflection at the peak load were influenced by both the fiber fraction and the matrix composition. Larger fiber volume fraction, longer fiber length, and higher cement content lead to a higher flexural strength, a larger deflection at peak, and a higher elastic modulus. Fracture process was studied using laser Moire interferometry and scanning electron microscopy. It was observed that sequential multiple cracking was associated with the strain hardening type of response and that the spatial distribution of fibers can control the sequence of multiple of cracking. Interface between fiber and matrix was also studied using continuous, aligned fibers and with the help of Moire interferometry.

Original languageEnglish (US)
Pages (from-to)555-564
Number of pages10
JournalACI Materials Journal
Volume94
Issue number6
StatePublished - Nov 1 1997

Keywords

  • Extrusion process
  • Fiber-cement composites
  • Fracture process mechanism
  • PVA fiber
  • Postpeak strain hardening response

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction
  • Materials Science(all)

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