Thermo-mechanical Bonding Behaviour of CFRP NSM System Using Cement-Based Adhesive


MohammadiFirouz R., Pereira E., Barros J.

10th International Conference on Fibre-Reinforced Polymer (FRP) Composites in Civil Engineering (CICE), İstanbul, Turkey, 8 - 10 December 2021, vol.198, pp.287-299 identifier identifier

  • Publication Type: Conference Paper / Full Text
  • Volume: 198
  • Doi Number: 10.1007/978-3-030-88166-5_24
  • City: İstanbul
  • Country: Turkey
  • Page Numbers: pp.287-299
  • Keywords: CFRP, High temperature, NSM, Cement-based adhesive, Surface treatment, FRP
  • Istanbul Technical University Affiliated: No

Abstract

Near surface mounted(NSM) strengthening technique, using fiber reinforced polymer (FRP) composite materials, is one of the most promising solutions for dealing with the deterioration problems of current reinforced concrete (RC) structures. However, intense research is still ongoing to keep improving this technique in the cases where its application shows limitations, e.g. in cases of fire hazard. The bonding in NSM systems is usually guaranteed by polymeric matrices like epoxy adhesives. However certain drawbacks result from the use of these adhesives, such as low resistance to elevated temperatures. This characteristic leads to premature failure under these circumstances, preventing the mobilization of the exceptional load carrying capacity of carbon fibers. Thus, the development of solutions involving alternative adhesives seems technically and economically relevant. Cement-based materials, which are incombustible and show low thermal diffusivity, show great potential as a valid alternative. Recent investigations suggest the possibility of transferring stresses between the NSM system and concrete substrate using cementitious matrices. However, the performance of these materials in different loading conditions, including high temperature exposure, need to be better explored.