Durability Evaluation of Carbon FRP/Concrete Shear Bond Strength

Zahra Karim, Antonio Nanni

Research output: Contribution to journalConference article


The bond between external fiber reinforced polymer (FRP) reinforcement and concrete substrate is of critical importance for the effectiveness of this strengthening technology. As a result, the design of reinforced concrete (RC) members strengthened with FRP composites is to account for, among other failure modes, the debonding of the laminate from the substrate. Although analytical and experimental research conducted for over two decades has led to archival publications and guides, no standard test methodology is yet available for shear bond strength evaluation after aggressive environmental conditioning. This paper aims at studying the durability of the bond strength between carbon FRP (CFRP) laminate and concrete substrate. The set-up consists of a small, plain concrete beam reinforced with an externally-bonded CFRP laminate that is tested under three-point bending. The force that the CFRP laminate can bear before detaching is easily calculated and the effect of accelerated conditioning is thus evaluated. Different environments and times of exposure are considered including 100% relative humidity, saltwater, alkali solution and dry heat. Statistical analysis are carried out to obtain statistical evidence on the effect of both the conditioning environment and the time of exposure on shear bond strength. The test methodology used in this work has the attributes of an effective standard.

Original languageEnglish (US)
Pages (from-to)285-298
Number of pages14
JournalAmerican Concrete Institute, ACI Special Publication
Issue numberSP 322
StatePublished - Jan 1 2014
Externally publishedYes
EventTowards Sustainable Infrastructure with Fiber Reinforced Polymer Composites: A Symposium Honoring Khaled Soudki at the ACI Fall 2014 Convention and ACI Spring 2015 - Kansas City, United States
Duration: Apr 12 2015Apr 16 2015


  • Bond properties
  • Durability
  • Fiber reinforced polymer
  • Material testing
  • Shear bond test

ASJC Scopus subject areas

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

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