Hybrid Bonding of FRP to Reinforced Concrete Structures
Publication: Journal of Composites for Construction
Volume 12, Issue 3
Abstract
The adhesive attachment of fiber-reinforced polymers (FRP) laminate to the external face of reinforced concrete structures is currently one of the most popular and effective methods for retrofitting and strengthening concrete structures. With this method, the additional strength of the attached reinforcement is transmitted into the concrete members through adhesion. However, the relatively weak adhesive interface fundamentally limits the efficacy of the method. Much effort has been made in the research community to improve the bond strength and develop bond models, but a satisfactory solution has yet to be found. Mechanical fastening is another more traditional technology that is used to bond one material to another. This paper introduces a new hybrid bonding technique that combines adhesive bonding and a new type of mechanical fastening. The new mechanical fastening technique does not rely on bearing to transmit the interfacial shear, but instead increases the interfacial bond by resisting the separation of the FRP laminate from the concrete substrate. Experimental tests demonstrated that the bond strength with this new hybrid bonding technology was 7.5 times that of conventional adhesive bonding. Furthermore, the new bonding technique is applicable to all types of commercially available FRP laminate (fabric, sheet, plate, and strip), and in principle is also applicable to materials other than FRP.
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Acknowledgments
The work that is described in this paper was fully supported by a grant from the Research Grants Council of the Hong Kong Special Administrative Region, China (Project No. UNSPECIFIEDCityU 1113/04E).
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Information
Published In
Journal of Composites for Construction
Volume 12 • Issue 3 • June 2008
Pages: 266 - 273
Copyright
© 2008 ASCE.
History
Received: Jan 11, 2007
Accepted: Aug 13, 2007
Published online: Jun 1, 2008
Published in print: Jun 2008
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