Quasi-brittle behavior of cementitious matrix composites

Claudia P. Ostertag, Chong Ku Yi

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Observations on crack interactions with bridging sites during in situ crack propagation in steel microfiber reinforced cementitious composites are presented. The loading fixture used for identifying the toughening mechanisms is briefly described. The loading fixture can be placed under an optical microscope, inside a Scanning Electron Microscope (SEM) or inside the Environmental Electron Microscope (ESEM). Controlled displacements are applied to compact tension specimens through a piezoelectric translator which is driven by a high voltage amplifier. The in situ crack propagation measurements reveal energy absorbing mechanisms in the vicinity of fiber and aggregate bridging sites which are contributing to the strength and toughness enhancement observed in these composites.

Original languageEnglish
Pages (from-to)88-95
Number of pages8
JournalMaterials Science and Engineering A
Volume278
Issue number1-2
DOIs
Publication statusPublished - 2000 Feb 15
Externally publishedYes

Keywords

  • Aggregate bridging
  • Fiber bridging
  • Friction
  • Microcracking
  • Microfibers

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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