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Bond strength of CFRP–concrete elements under freeze–thaw cycles.pdf

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Bond strength of CFRP–concrete elements under freeze–thaw cycles

Composite Structures 92 (2010) 973–983Contents lists available at ScienceDirect Composite Structures journal homepage: www.elsevier .com/locate /compstructBond strength of CFRP–concrete elements under freeze–thaw cycles Pierluigi Colombi *, Giulia Fava, Carlo Poggi Department of Structural Engineering, Technical University of Milan (Politecnico di Milano), P.zza L. da Vinci, 32, 20133 Milan, Italy a r t i c l e i n f oArticle history: Available online 30 September 2009 Keywords: RP-concrete debonding Durability Fracture energy Experimental tests Freeze–thaw cycles0263-8223/$ - see front matter 2009 Elsevier Ltd. A doi:10.1016/pstruct.2009.09.044 * Corresponding author. Tel.: +39 02 fax E-mail address: colombi@stru.polimi.it (P. Colomba b s t r a c t Bonding between the adherents represents a key point when dealing with the reinforcement of concrete structures by using FRPs. Bonding depends on mechanical and physical properties of concrete, composite and adhesive as well as on the surface treatment of the concrete substrate. A very important topic for civil engineering applications is related to the durability of the bond in harsh environments. In the present paper some specimens were first subjected to freeze–thaw cycles and then experimental debonding tests were performed in order to investigate the effects of the bonding length and environmental conditions. First, the effects of environmental conditions on bond strength is discussed. Finally, the experimental data are compared to the design formulae proposed by the Italian Recommendations CNR DT200/2004 and critical considerations are presented. 2009 Elsevier Ltd. All rights reserved.1. Introduction Bonding between the FRP reinforcement and concrete substrate is a very important aspect in strengthening concrete elements. Debonding represents a brittle failure mechanism to avoid in practical applications. In reinforcing concrete beams for bending, debonding may occur close to the reinforcement ends (e