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Steel and Composite Structures
  Volume 32, Number 5, September10 2019 , pages 559-569

An experimental investigation on effect of elevated temperatures on bond strength between externally bonded CFRP and concrete
Behzad Attari and Mohammadreza Tavakkolizadeh

    The bond strength between composite laminates and concrete is a key factor that controls the behavior of concrete members strengthened with fiber reinforced polymer (FRP) sheets, which can be affected by several parameters such as thermal stresses and surface preparation. This article presents the result of an experimental study on the bond strength between FRP sheets and concrete at ambient temperature after specimens had been exposed to elevated temperatures of up to 200°C. For this purpose, 30 specimens of plain concrete with dimensions of 150×150×350 mm were prepared. Three different conventional surface preparation methods (sandblasting, wire brushing and hole drilling) were considered and compared with a new efficient method (fiber implantation). Deformation field during each experiment was monitored using particle image velocimetry. The results showed that, the specimens which were prepared by conventional surface preparation methods, preserved their bond integrity when exposed to temperature below glass transition temperature of epoxy resin (about 60°C). Beyond this temperature, the bond strength and stiffness decreased significantly (about 50%) in comparison with control specimens. However, the specimens prepared by the proposed method displayed higher bond strengths of up to 32% and 90% at 25°C and 200°C, respectively.
Key Words
    FRP; temperature; bond strength; fiber implantation; PIV
Department of Civil Engineering, Ferdowsi University of Mashhad, Mashhad, Iran.

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