Ambient temperature performance of cementitious matrices for fire-safe NSM FRP strengthening of concrete structures

Iolanda Del Prete, Antonio Bilotta*, Luke Bisby, Emidio Nigro

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

The near surface mounted (NSM) fiber reinforced polymer (FRP) strengthening technique is a demonstrated, attractive and efficient alternative to externally bonded reinforcement (EBR) strengthening systems. NSM strengthening can be used to enhance the stiffness and the strength of deficient reinforced concrete members, with high utilisation of the FRP's mechanical properties (at ambient temperature) when epoxy is used as bonding agent. However, owing to epoxy adhesives’ sensitivity to elevated temperature exposure, recent research has focused on the use of cementitious adhesives, which are less sensitive to elevated temperature, in NSM FRP applications. This paper presents results from 22 bond pull-out tests at ambient temperature on concrete prisms with an embedded carbon FRP bar NSM strengthening system. Different bonding agents (i.e. epoxy resin or cementitious grout), positions of the bar in the groove (i.e. in the centre or at the top of the groove), bar surface treatments (smooth and ribbed) and bond length (300 and 400 mm) are investigated.

Original languageEnglish
Article numberCONBUILDMAT-D-17-04735
Pages (from-to)42-54
Number of pages13
JournalConstruction and Building Materials
Volume193
Early online date28 Oct 2018
DOIs
Publication statusPublished - 30 Dec 2018

Keywords

  • Bond tests
  • Cementitious adhesives
  • Epoxy adhesives
  • FRP
  • NSM
  • Strengthening

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