Investigation into bond behaviour of a new CFRP anchorage system for concrete utilising a mechanically strengthened substrate

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Title: Investigation into bond behaviour of a new CFRP anchorage system for concrete utilising a mechanically strengthened substrate
Author(s): Kalfat, R.; Al-Mahaidi, R.
Abstract: Failure of CFRP strengthening systems when applied to concrete structures is usually typified by de-lamination of the CFRP from the concrete substrate. To prevent this type of failure, current standards and design guidelines impose strict limitations on the maximum strain level of the composite material which may be utilised in design. Emerging research has shown that anchoring the ends of the CFRP plates or sheets can result in a significantly higher load/stress being reached before de-bonding occurs. This paper investigates a method of anchoring CFRP laminates by utilisation of a mechanical chase cut into the concrete over the anchorage length. Experiments have shown this to be an effective way to improve the strength of the concrete substrate, resulting in higher CFRP bond strength and improvements in maximum elongations, bond stress, slip and load carrying capacity of the CFRP to concrete joint.
Publication type: Journal article
Research centre: Swinburne University of Technology. Faculty of Engineering and Industrial Sciences
Source: Composite Structures, Vol. 92, no. 11 (Oct 2010), pp. 2738-2746
Publication year: 2010
FOR Code(s): 0905 Civil Engineering; 0915 Interdisciplinary Engineering
Keyword(s): Anchorage systems; Bond behaviour; CFRP; Mechanical chase; Substrate strengthening
Publisher: Elsevier
ISSN: 0263-8223
Publisher URL: http://dx.doi.org/10.1016/j.compstruct.2010.04.004
Peer reviewed