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Experimental study on RC beams with FRP strips bonded with rubber modified resins

Authors Gao, Bo HKUST affiliated (currently or previously)
Kim, Jang Kyo View this author's profile
Leung, Christopher Kin Ying View this author's profile
Issue Date 2004
Source Composites science and technology , v. 64, (16), 2004, DEC, p. 2557-2564
Summary This paper presents the effects of adhesive properties on structural performance of reinforced concrete (RC) beams strengthened with carbon fiber reinforced plastic (CFRP) strips. The epoxy adhesives modified with liquid rubber of different content were used to bond the CFRP strips, and four point bending experiments were carried out on RC beams. The experimental results show that different CFRP strip thickness of 0.22 and 0.44 mm resulted in a transition of failure mechanism from interfacial debonding along the CFRP-concrete interface to concrete cover separation starting from the end of CFRP strips in the concrete. Moreover, it is suggested that no matter interfacial debonding or concrete cover separation, the rubber modifier enhanced the structural performance by increasing the maximum load-carrying capacity and the corresponding ductility, compared with the beams bonded with a neat epoxy resin. The improvement of structural performance due to modified adhesive was associated with the modification of stress profiles along the CFRP-concrete interface especially the stress concentration at the end of FRP, and the enhanced interlaminar fracture toughness. Rubber modified epoxy therefore is worth further studying in practical repair applications. (C) 2004 Elsevier Ltd. All rights reserved.
ISSN 0266-3538
Rights Composites Science and Technology © copyright (2004) Elsevier. The Journal's web site is located at
Language English
Format Article
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