Influence of steel fiber content on the rate-dependent flexural performance of ultra-high performance concrete with coarse aggregates

Shaohua Li, Ole Mejlhede Jensen, Qingliang Yu*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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Abstract

Steel fiber is widely used to improve the flexural performance of ultra-high performance concrete (UHPC), yet the synergistic effect of steel fiber and coarse aggregates in UHPC containing coarse aggregates (UHPC-CA) has not been elucidated. Here, the influence of fiber content on the rate-dependent flexural performance of UHPC-CA is investigated from the view of the synergistic effect of steel fiber and coarse aggregates. Results reveal that the increasing pull-out force due to the increase of the crack mouth opening speed at a higher loading rate is responsible for the flexural curve type transition of UHPC-CA. The first crack stress is insensitive to the fiber content. However, the dynamic increase factors (DIFs) of the flexural strength and energy absorption capability of UHPC-CA decrease with increasing fiber content, which is attributed to a lower crack propagation speed of UHPC-CA with a higher fiber content. A model concerning the crack propagation speed and the critical angle for the fracture of coarse aggregates is proposed.
Original languageEnglish
Article number125935
JournalConstruction and Building Materials
Volume318
Number of pages13
ISSN0950-0618
DOIs
Publication statusPublished - 2022

Keywords

  • Ultra-high performance concrete
  • Coarse aggregate
  • Flexural strength
  • Steel fiber
  • Rate-dependence

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