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An experimental study of different factors affecting the bond of NSM FRP bars in concrete

Near-surface mounted (NSM) fiber reinforced polymer (FRP) reinforcement has proven to be an efficient technique for strengthening concrete members. The bond behavior of the NSM system depends on the bond in the two existing interfaces, while the response in terms of load-slip curves and load capacity may be strongly affected by many other parameters. As a consequence of the variety of factors affecting the bond, different studies into the behavior of NSM FRP reinforcement have been carried out in recent years. In this paper, an experimental study is performed in which the effect of adhesive properties, bar type, bar size, FRP properties, groove geometry and the use of mechanical interlocking on the capacity and bond behavior of a NSM joint is investigated. The failure load, average bond stress, loaded end slip, free end slip, transverse strains (on adhesive and concrete), and the mode of failure for the tested joints are reported and discussed. The results show that the adhesive properties, FRP bar size and bar surface treatment were critical factors in the capacity and mode of failure of the specimens tested

The authors acknowledge the support provided by the Spanish Government (Ministerio de Ciencia e Innovacion), Project Ref. BIA2010-20234-C03-02. The first author also acknowledges support from the Generalitat de Catalunya for an FI pre-doctoral Grant, Ref. 2011FI_B 00003

© Composite Structures, 2013, vol. 99, p. 350-365

Elsevier

Author: Sharaky, Ibrahim Attia
Torres Llinàs, Lluís
Baena Muñoz, Marta
Miàs Oller, Cristina
Date: 2013
Abstract: Near-surface mounted (NSM) fiber reinforced polymer (FRP) reinforcement has proven to be an efficient technique for strengthening concrete members. The bond behavior of the NSM system depends on the bond in the two existing interfaces, while the response in terms of load-slip curves and load capacity may be strongly affected by many other parameters. As a consequence of the variety of factors affecting the bond, different studies into the behavior of NSM FRP reinforcement have been carried out in recent years. In this paper, an experimental study is performed in which the effect of adhesive properties, bar type, bar size, FRP properties, groove geometry and the use of mechanical interlocking on the capacity and bond behavior of a NSM joint is investigated. The failure load, average bond stress, loaded end slip, free end slip, transverse strains (on adhesive and concrete), and the mode of failure for the tested joints are reported and discussed. The results show that the adhesive properties, FRP bar size and bar surface treatment were critical factors in the capacity and mode of failure of the specimens tested
The authors acknowledge the support provided by the Spanish Government (Ministerio de Ciencia e Innovacion), Project Ref. BIA2010-20234-C03-02. The first author also acknowledges support from the Generalitat de Catalunya for an FI pre-doctoral Grant, Ref. 2011FI_B 00003
Format: application/pdf
ISSN: 0263-8223 (versió paper)
1879-1085 (versió electrònica)
Document access: http://hdl.handle.net/10256/11961
Language: eng
Publisher: Elsevier
Collection: MICINN/PN 2011-2013/BIA2010-20234-C03-02
Reproducció digital del document publicat a: http://dx.doi.org/10.1016/j.compstruct.2012.12.014
Articles publicats (D-EMCI)
Is part of: © Composite Structures, 2013, vol. 99, p. 350-365
Rights: Tots els drets reservats
Subject: Assaigs de materials
Materials -- Testing
Formigó armat -- Proves
Reinforced concrete -- Testing
Resistència de materials
Strength of materials
Esforç i tensió
Strains and stresses
Title: An experimental study of different factors affecting the bond of NSM FRP bars in concrete
Type: info:eu-repo/semantics/article
Repository: DUGiDocs

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