Experimental investigation on post-impact bond performance of carbon fiber-reinforced polymer tendons in ultra-high performance concrete

Yawei Fang, Zhi Fang, Pengjie Liu, Yu Xiang, Xuhong Zhou

Research output: Journal article publicationJournal articleAcademic researchpeer-review

Abstract

The bond performance of a carbon fiber-reinforced polymer (CFRP) tendon in ultra-high performance concrete (UHPC) deteriorates significantly under impact loads. However, the post-impact bond performance, which is crucial for the design and safety assessment of CFRP-UHPC structures after experiencing impact loads, remains unclear. This paper delved into the post-impact bond performance of a CFRP tendon in UHPC through 21 groups of pullout tests, and the influences of the embedded length of the tendon in UHPC, impact height, and initial pretension on the residual bond properties after impact were analyzed. The results show that after exposure to the impact with a higher drop height, the CFRP tendon tended to slide out of UHPC with slighter damages on the tendon surface, and correspondingly, the residual bond strength between the CFRP tendon and UHPC after impact was higher. With the increase in the embedded length of the CFRP tendon in UHPC, the pullout capacity increased and the constraining effect of the external steel barrel to the inside CFRP tendon and UHPC improved, which resulted in a higher residual bond strength. A higher initial pretension induced more pronounced shear damage and abrasion on the CFRP ribs, therefore, weakening the remaining resistance to pullout tension after impact. Finally, prediction formulas for the residual bond strength of a CFRP tendon with different embedded lengths and pretension in UHPC, following impacts at various strain rates, were developed.

Original languageEnglish
Article number136214
JournalConstruction and Building Materials
Volume427
DOIs
Publication statusPublished - 10 May 2024

Keywords

  • Bond
  • Carbon fiber-reinforced polymer (CFRP) tendon
  • Post-impact
  • Pretension
  • Ultra-high performance concrete (UHPC)

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction
  • General Materials Science

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