Fracture behaviour of steel fibre reinforced recycled aggregate concrete after exposure to elevated temperatures

G. M. Chen, H. Yang, C. J. Lin, J. F. Chen*, Y. H. He, H. Z. Zhang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

27 Citations (Scopus)

Abstract

In the past decade, research on applications of recycled aggregate concrete (RAC), which uses recycled concrete aggregate (RCA), has attracted world-wide interest due to their social, environmental and potential economic benefits. One of the main concerns for using such concrete in buildings is its spalling in fire and post-fire residual mechanical properties. This concern may be alleviated by adding steel fibres to form steel fibre reinforced recycled aggregate concrete (SFRAC). In this study, 60 notched beams were tested to evaluate the fracture behaviour of SFRAC after exposure to elevated temperatures, including the modulus of elasticity (E), fracture energy (GF), initiation fracture toughness KIcini and unstable fracture toughness KIcun. The effects of steel fibre volume content (0%, 0.5%, 1% and 1.5%) and exposure temperature (room temperature, 200 °C, 400 °C and 600 °C), were investigated. The test results show that the addition of steel fibres postpones the initiation of cracks and limits their opening in RAC, and thus significantly enhances the fracture energy and fracture toughness of RAC after exposure to high temperatures.

Original languageEnglish
Pages (from-to)272-286
Number of pages15
JournalConstruction and Building Materials
Volume128
DOIs
Publication statusPublished - 15 Dec 2016

Keywords

  • Elevated temperature
  • Fracture energy
  • Fracture toughness
  • Recycled aggregate concrete
  • Steel fibre

ASJC Scopus subject areas

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

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