Local bond-slip response of GFRP rebar in ultra-high-performance fiber-reinforced concrete

Doo Yeol Yoo, Ki Yeon Kwon, Jung Jun Park, Young Soo Yoon

Research output: Contribution to journalArticlepeer-review

134 Citations (Scopus)


This study investigates the bond performance of steel and glass fiber-reinforced polymer (GFRP) rebars embedded in ultra-high-performance fiber-reinforced concrete (UHPFRC). The steel rebar showed 2.8-3.6 times higher bond strengths than the GFRP rebar and rebar yielding at embedment length of 2 times the rebar diameter. The bond failure of GFRP rebar occurred by delaminating resin and fiber in GFRP rebar, different to that of steel rebar (shearing off and crushing of concrete). For GFRP rebar, higher bond strength was obtained when a larger rebar diameter and a shorter embedment length were used, and reincrease of pull-out stress in softening branch was observed owing to wedging effect. Equations for normalized bond strength and development length of GFRP rebar embedded in UHPFRC with pull-out failure were suggested. In addition, analytical models for bond-slip response of GFRP rebar proposed in the literature were considered, and adequate parameters were derived from the present test data.

Original languageEnglish
Pages (from-to)53-64
Number of pages12
JournalComposite Structures
Publication statusPublished - 2015 Feb 1

Bibliographical note

Funding Information:
This research was supported by a grant from a Construction Technology Research Project 13SCIPS02 (Development of impact/blast resistant HPFRCC and evaluation technique thereof) funded by the Ministry on Land, Infrastructure, and Transport.

Publisher Copyright:
© 2014 Elsevier Ltd.


  • Analytical modeling
  • Bond
  • Development length
  • Glass fiber-reinforced polymer
  • Ultra-high-performance fiber-reinforced concrete

ASJC Scopus subject areas

  • Ceramics and Composites
  • Civil and Structural Engineering


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