Flexural strengthening of RC beams with GFRP grid reinforced polymer

Piyong Yu, Pedro F. Silva, Antonio Nanni

Research output: Contribution to journalConference articlepeer-review


Synopsis: Flexural strengthening of reinforced concrete (RC) beams with fiber reinforced polymer (FRP) composites and two different bonding agents were investigated in this research. The bonding agents used in this research consisted of an epoxy paste and a sprayed polyurea. When polyurea was used as the bonding agent, it was sprayed to specific regions on the RC beams. Three RC beams were .flexural strengthened with FRP composites according to the following techniques: (a) sprayed polyurea with and without glass FRP (GFRP) grid reinforcement, and (b) manual layup using one GFRP grid. Experimental results clearly indicate that flexural strengthening with the un-reinforced or reinforced polyurea technique is an effective strengthening scheme. Advantages of using polyurea over other epoxy based methods are that the application process requires significantly less time and the polyurea cures within minutes. Furthermore, no debonding of the un-reinforced or reinforced polyurea system was observed, suggesting a further benefit of this technique. Application of the polyurea system and key experimental results are presented and discussed herein.

Original languageEnglish (US)
Pages (from-to)845-856
Number of pages12
JournalAmerican Concrete Institute, ACI Special Publication
Issue numberSP 327
StatePublished - Jan 1 2017
Event13th International Symposium on Fiber-Reinforced Polymer Reinforcement for Concrete Structures 2017, FRPRCS 2017 - Anaheim, United States
Duration: Oct 15 2017Oct 19 2017


  • GFRP
  • Grids
  • Polyurea
  • Reinforced concrete
  • Retrofit
  • Strengthening

ASJC Scopus subject areas

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


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