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Influence of restraint thermal effects on the bond strength of externally bonded CFRP-concrete joints

Author
Organization
Abstract
Elevated temperatures lead to a reduction of the bond strength of FRP (fibre reinforced polymer) reinforcement glued on concrete by ambient cured epoxy adhesive. This degrading behaviour is mainly observed for exposure temperatures beyond the glass transition temperature of the epoxy (Tg ≃ 60–80 °C) which is usually 2–3 times lower than the Tg of the matrix of pultruded FRP reinforcement. Contrary, lap shear tests on FRP-concrete systems made with carbon fibre reinforced polymer (CFRP) revealed an increase of the bond strength at temperatures close to the Tg of the epoxy adhesive. Several explanations have been expressed for this unexpected trend. The most accredited hypothesis describes the increase of bond strength as a consequence of the induced restraint thermal effect between the CFRP and the concrete substrate, because of the different thermal elongation of the materials. In this work, the influence of the restraint thermal effect is investigated further in terms of influence on the ultimate load recorded by lap shear tests at elevated temperature and to understand better the underlying mechanism. The obtained outcomes have revealed that the evaluation of the restrained thermal action has to consider the influence of the bond length of the joint and the thermal degradation of the adhesive.
Keywords
Debonding, Carbon fibre reinforced polymer (CFRP), Temperature, Bond-slip model, Bond length, Glass transition temperature

Citation

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Chicago
Proia, Alessandro, and Stijn Matthys. 2019. “Influence of Restraint Thermal Effects on the Bond Strength of Externally Bonded CFRP-concrete Joints.” Ed. A. J. M. Ferreira. Composite Structures 221.
APA
Proia, A., & Matthys, S. (2019). Influence of restraint thermal effects on the bond strength of externally bonded CFRP-concrete joints. (A. J. M. Ferreira, Ed.)COMPOSITE STRUCTURES, 221.
Vancouver
1.
Proia A, Matthys S. Influence of restraint thermal effects on the bond strength of externally bonded CFRP-concrete joints. Ferreira AJM, editor. COMPOSITE STRUCTURES. Elsevier; 2019;221.
MLA
Proia, Alessandro, and Stijn Matthys. “Influence of Restraint Thermal Effects on the Bond Strength of Externally Bonded CFRP-concrete Joints.” Ed. A. J. M. Ferreira. COMPOSITE STRUCTURES 221 (2019): n. pag. Print.
@article{8613332,
  abstract     = {Elevated temperatures lead to a reduction of the bond strength of FRP (fibre reinforced polymer) reinforcement
glued on concrete by ambient cured epoxy adhesive. This degrading behaviour is mainly observed for exposure
temperatures beyond the glass transition temperature of the epoxy (Tg ≃ 60–80 °C) which is usually 2–3 times
lower than the Tg of the matrix of pultruded FRP reinforcement. Contrary, lap shear tests on FRP-concrete
systems made with carbon fibre reinforced polymer (CFRP) revealed an increase of the bond strength at temperatures
close to the Tg of the epoxy adhesive. Several explanations have been expressed for this unexpected
trend. The most accredited hypothesis describes the increase of bond strength as a consequence of the induced
restraint thermal effect between the CFRP and the concrete substrate, because of the different thermal elongation
of the materials. In this work, the influence of the restraint thermal effect is investigated further in terms of
influence on the ultimate load recorded by lap shear tests at elevated temperature and to understand better the
underlying mechanism. The obtained outcomes have revealed that the evaluation of the restrained thermal
action has to consider the influence of the bond length of the joint and the thermal degradation of the adhesive.},
  articleno    = {110858},
  author       = {Proia, Alessandro and Matthys, Stijn},
  editor       = {Ferreira, A. J. M.},
  issn         = {0263-8223},
  journal      = {COMPOSITE STRUCTURES},
  keywords     = {Debonding,Carbon fibre reinforced polymer (CFRP),Temperature,Bond-slip model,Bond length,Glass transition temperature},
  language     = {eng},
  pages        = {11},
  publisher    = {Elsevier},
  title        = {Influence of restraint thermal effects on the bond strength of externally bonded CFRP-concrete joints},
  url          = {http://dx.doi.org/10.1016/j.compstruct.2019.04.030},
  volume       = {221},
  year         = {2019},
}

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