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Bond mechanism of FRP rebars to concrete

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Abstract

The bond mechanism of Fiber Reinforced Polymer (FRP) rebar to concrete was studied. Five different types of 12.7 and 12.0-mm rebar subjected to different surface treatments were tested, and the bond mechanism was compared with that of untreated FRP rods and ordinary deformed steel.

High bond values were obtained for rods exhibiting a stiff deformed surface, on which large deformations were molded by resin, and for rods with a rough surface whereby the roughness has resulted either from winding a helical fiber together with embedded sand particles or from using excess polymer. The bond values recorded were equivalent to or larger than those of ordinary deformed steel. Low bond strength was obtained both for rods with a thick polymeric layer of low mechanical for rods with a thick polymeric layer of low mechanical properties and for rods with smooth surfaces.

Different pre-peak and post-peak behavior was observed for the various rods when the entire set of P-s (Pullout load vs. slip) curves were compared. Brittle behavior was apparent wherever the external layer of the rod exhibited large deformations formed in a stiff matrix. Where the surface was rough, more ductile behavior was detected. The wedging of particles into the surface can alter the load-slip behavior, from one of slip-weakening to one of slip-hardening.

Résumé

Une étude a été menée sur le mécanisme de l’adhérence an béton de barres nervurées en polymère renforcé par des fibres (PRF). Cinq différents types de barres nervurées, de 12,7 mm et de 12,0 mm, présentant différents traitements de surfaces, out été testés. Le mécanisme de l’adhérence a été comparé au mécanisme de barres PRF non-traitées et à celui de barres crénelées en acier ordinaire.

Des valeurs élevées d’adhérence ont été obtenues avec des barres ayant une surface rigide déformée, où d’importantes crénelures ont été formées par la résine, ou avec des barres ayant une surface inégale, dont les aspérités avaient été obtenues par l’enroulement d’une fibre hélicoïdale et l’enrobage de particules de sable ou encore en utilisant un surplus de polymère. Les valeurs d’adhérence étaient similaires ou supérieures à celles des barres crénelées en acier ordinaire. Une adhérence inférieure a été obtenue avec une barre couverte d’une couche épaisse de polymère ayant des qualités mécaniques inférieures ou avec une barre à surface lisse.

En comparant les courbes de force d’extraction-glissement, un comportement différent avant et après le sommet a été observé pour les différentes barres. Un comportement fragile a été noté aux endroits où la couche extérieure de la barre présentait d’importantes crénelures, formées dans un polymère rigide. Aux endroits où la surface était inégale, un comportement plus ductile a été observé. Le clavetage des particules dans la surface est susceptible de modifier le comportement de la force d’extraction-glissement d’un affaiblissement du glissement vers un durcissement de ce dernier.

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Authors and Affiliations

  1. National Building Research Institute, Department of Civil Engineering, Technion-Israel Institute of Technology, 32000, Haifa, Israel

    A. Katz

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  1. A. Katz
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Editorial Note Dr. A Katz is a RILEM Senior Member. He works at the National Building Research Institute, a RILEM Titular Member

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Katz, A. Bond mechanism of FRP rebars to concrete. Mater Struct 32, 761–768 (1999). https://doi.org/10.1007/BF02905073

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  • DOI: https://doi.org/10.1007/BF02905073

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