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

Bo Gao; Jang Kyo Kim; Christopher K.Y. Leung

doi:10.1016/j.compscitech.2004.05.016

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

Bo Gao, Jang Kyo Kim, Christopher K.Y. Leung

Mechanical & Nuclear Engineering

The Hong Kong University of Science and Technology

Research output: Contribution to journal › Article › peer-review

76 Scopus citations

Abstract

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.

Original language	British English
Pages (from-to)	2557-2564
Number of pages	8
Journal	Composites Science and Technology
Volume	64
Issue number	16
DOIs	https://doi.org/10.1016/j.compscitech.2004.05.016
State	Published - Dec 2004

Keywords

A. Adhesive joints
A. Fibres
C. Failure criterion
C. Stress concentrations

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10.1016/j.compscitech.2004.05.016

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title = "Experimental study on RC beams with FRP strips bonded with rubber modified resins",

abstract = "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.",

keywords = "A. Adhesive joints, A. Fibres, C. Failure criterion, C. Stress concentrations",

author = "Bo Gao and Kim, {Jang Kyo} and Leung, {Christopher K.Y.}",

note = "Funding Information: This work has been supported by the Research Grants Council of the Hong Kong Administrative Region, China (Project No. HKUST 6050/99E). The technical supports by the Construction Materials Laboratory, Advanced Engineering Material Facilities (AEMF) and Design and Manufacturing Services Facility (DMSF) at HKUST are also acknowledged.",

year = "2004",

month = dec,

doi = "10.1016/j.compscitech.2004.05.016",

language = "British English",

volume = "64",

pages = "2557--2564",

journal = "Composites Science and Technology",

issn = "0266-3538",

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TY - JOUR

T1 - Experimental study on RC beams with FRP strips bonded with rubber modified resins

AU - Gao, Bo

AU - Kim, Jang Kyo

AU - Leung, Christopher K.Y.

N1 - Funding Information: This work has been supported by the Research Grants Council of the Hong Kong Administrative Region, China (Project No. HKUST 6050/99E). The technical supports by the Construction Materials Laboratory, Advanced Engineering Material Facilities (AEMF) and Design and Manufacturing Services Facility (DMSF) at HKUST are also acknowledged.

PY - 2004/12

Y1 - 2004/12

N2 - 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.

AB - 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.

KW - A. Adhesive joints

KW - A. Fibres

KW - C. Failure criterion

KW - C. Stress concentrations

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JO - Composites Science and Technology

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ER -

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

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Keywords

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