Bond of fiber-reinforced polymer laminates to concrete

Laura De Lorenzis, Brian Miller, Antonio Nanni

Research output: Contribution to journalArticlepeer-review

251 Scopus citations


Fiber-reinforced polymer (FRF) laminates are being successfully used worldwide for strengthening existing reinforced concrete structures. The bond of FRP reinforcement to the concrete substrate is of critical importance for the effectiveness of the technique. In this project, flexural test specimens were prepared to address some of the factors expected to affect bond, namely, bonded length, concrete strength, number of plies (stiffness), ply width, and, to a limited extent, surface preparation. Experimental results are presented and discussed herein. A linear bond stress-slip relationship, along with a simple shear model for the evaluation of the slip modulus, is used to predict the strain distribution at moderate load levels. Finally, expressions of the peeling load and the effective bond length are presented. A design equation is proposed for calculating the effective FRP ultimate strain to be used in design to account for bond-controlled failure.

Original languageEnglish (US)
Pages (from-to)256-264
Number of pages9
JournalACI Materials Journal
Issue number3
StatePublished - May 1 2001
Externally publishedYes


  • Bond
  • Concrete
  • Development length
  • External reinforcement
  • Fiber-reinforced polymers
  • Slip

ASJC Scopus subject areas

  • Building and Construction
  • Materials Science(all)


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