Bonding Behavior of Ribbed CFRP Rebar Embedded in UHPC considering Concrete Cover Thickness

Sun Jae Yoo, Tian Feng Yuan, Jean Luc Malan Parr, Young Soo Yoon

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


In this study, pull-out tests were conducted on ribbed carbon fiber reinforced polymer (CFRP) bars to evaluate bond strength, taking into account the variables of concrete compressive strength, cover thickness, and embedment length. The failure mode of ribbed CFRP bars with a diameter of 13 mm was also evaluated. Results showed that it was possible to prevent splitting failure of normal-and high-strength concrete when a cover thickness of 2.5 db and 3.5 db was used, respectively. Furthermore, only micro-cracks were observed in ultra-high performance concrete. Contrary to previous research, the bond strength continued to increase as the compressive strength of concrete and embedment length of ribbed CFRP bars increased. This enabled correlation between concrete compressive strength, cover thickness, and bond stress as well as analysis of the failure modes of concrete and ribbed CFRP bars. The experimental results were then compared with bond design codes to confirm the bond characteristics of ribbed CFRP bars.

Original languageEnglish
Pages (from-to)177-184
Number of pages8
JournalJournal of the Korea Concrete Institute
Issue number2
Publication statusPublished - 2023

Bibliographical note

Publisher Copyright:
© 2023 by Korea Concrete Institute.


  • bond strength
  • carbon fiber reinforced polymer
  • cover thickness
  • embedment length
  • ultra high strength concrete

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction
  • Materials Science (miscellaneous)
  • Mechanics of Materials


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