The Influence of Temperature on the Debonding of Externally Bonded CFRP


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Title: The Influence of Temperature on the Debonding of Externally Bonded CFRP

Author(s): E.L. Klamer, D.A. Hordijk, and H.J.M. Janssen

Publication: Special Publication

Volume: 230


Appears on pages(s): 1551-1570

Keywords: bond; CFRP; debonding; temperature; thermal stresses

Date: 10/1/2005

Fiber Reinforced Polymers have proven to be effective strengtheningmaterials in the construction industry, due to their low weight (easy to apply), non-corrosiveness and high strength. Extensive research has been carried out into thestrengthening of concrete structures with externally bonded FRP. It turned out thatdebonding of the FRP is governing the design of most FRP strengthening applications.One of the parameters, which may affect the bond properties of the FRP-concrete joint,is the ambient temperature. Only little research into the influence of temperature onthe bond behavior has been carried out so far. This paper presents the results of anexploratory experimental and numerical investigation in which the influence oftemperature on the debonding behavior of externally bonded CFRP was investigated.Two different test setups were applied. Results showed that the failure load of CFRPstrengthened concrete structures was affected by the temperature, but depended onthe used test setup. Two types of failure were observed. For low to moderatetemperatures (-10°C to +40°C), failure occurred in the concrete, leaving 1-3 mm ofconcrete attached to the adhesive. For elevated temperatures (50°C to 75°C), failure ofthe adhesive-concrete interface occurred, without leaving any concrete attached to theadhesive.