Experimental Observation on Bond-Slip Behavior between Concrete and CFRP Plate

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Title: Experimental Observation on Bond-Slip Behavior between Concrete and CFRP Plate

Author(s): Dong-Suk Yang, Sung-Nam Hong, and Sun-Kyu Park

Publication: IJCSM

Volume: 1

Issue: 1

Appears on pages(s): 37-43

Keywords: bond-slip model; bond strength; CFRP Plate; debonding; shear

Date: 12/31/2007

Abstract:
This paper discusses the failure mode of reinforced concrete beams strengthened with composite materials and six experimental set-ups using to determine the FRP-to-concrete bond strength. This paper presents interfacial bond behavior of shear test between concrete and CFRP plates. Shear test were performed with concrete compressive strength (21MPa, 28MPa) and bonding length (100mm, 150mm, 200mm, 250mm) as variables of experiment. These shear test results indicate that the effective bond length (the bond length beyond which the ultimate load no longer increases) was estimated about 19.6~20.4cm using the linear regression analysis. Failure mode of specimens occurred due to debonding between concrete and CFRP plates, maximum bond stress is calculated about 3.0~3.3MPa using the basic equation for bond stress and slip. Finally, the interfacial bond-slip model between CFRP plates and concrete, which is governed debonding failure, has been estimated from shear tests. Average bond stress was about 1.86~2.04MPa, the volume of slip between CFRP plate and concrete was about 1.45~1.72mm, and the fracture energy was found to be about 1.35~1.71N/mm


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