Assessment of flexural toughness and impact resistance of bundle-type polyamide fiber-reinforced concrete

Hongseop Kim, Gyuyong Kim, Nenad Gucunski, Jeongsoo Nam, Joongkyu Jeon

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Abstract

Abstract This study compares the fiber/matrix bonding strength and flexural properties of bundle-type polyamide fibers to those of hooked-end steel fibers. Their fracture behavior upon impact with a high-velocity projectile is also assessed in terms of penetration depth, crater diameter and rear-side scabbing. The results obtained demonstrate that the bundle-type polyamide fibers undergo fracture without fiber pullout because of the increased interfiber gap and specific surface area for bonding, but exhibit poorer flexural fracture behavior with a lower flexural strength and fracture energy when compared to hooked-end steel fibers. Yet despite this, concrete reinforced with bundle-type fibers is shown to more effectively suppress scabbing during high-velocity impact, which is attributed to a more efficacious dispersion of shock stress due to the increased number of individual fibers.

Original languageEnglish (US)
Article number3542
Pages (from-to)431-446
Number of pages16
JournalComposites Part B: Engineering
Volume78
DOIs
Publication statusPublished - Sep 15 2015

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All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Mechanics of Materials
  • Mechanical Engineering
  • Industrial and Manufacturing Engineering

Keywords

  • A. Fibres
  • B. Fibre/matrix bond
  • B. Fracture toughness
  • B. Impact behaviour
  • B. Mechanical properties

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