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Bond characteristics between concrete and near-surface mounted carbon fiber reinforced polymer cords

Bond characteristics between concrete and near-surface mounted carbon fiber reinforced polymer cords Previous studies showed that near-surface mounting (NSM) strengthening technique with rigid CFRP materials has potential advantages over the externally bonded reinforcing (EBR), therefore, it becomes efficient methodology for concrete strengthening. However, rigid NSM-CFRP cannot be wrapped around a deteriorated structural element; the need for the existence of flexible material has appeared. Therefore, in this study the flexible NSM-CFRP (cord) is investigated as strengthening technique instead of rigid NSM-CFRP. The aim of this study is to recognize the parameters affecting the bond performance of carbon fiber-reinforced concrete (CFRP) cord and concrete. These parameters are cords’ bonded length, the ratio between cord’s width and depth, concrete compressive strength, number of CFRP cords used and the distance separating cords in multi-cord specimens. Fifty-four concrete prisms were cast from 25 MPa and 50 MPa concrete compressive strengths. Thirtyeight prisms reinforced by a single cord with various cord sizes were prepared. Twelve and four specimens were reinforced with two and three cords, respectively. In the case of multi-cord specimens, a unified bond length and cord’s aspect ratio were carried out. The main parameter to be studied in this case is the cords’ separating spacing. The test results indicated that increasing (NSMCFRP) cords bonded length, concrete compressive strength, number of applied CFRP cords, the spacing between cords and reducing cords’ aspect ratio (width/depth ratio) cause an increment in the pull-out force, and then a better strengthening is achieved. Rupture was the predominant failure mode for specimens with the same bond and equal cord dimension, while debonding of the CFRP cords is the most frequent failure mode for multi-cords specimens with greater spacing. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Structural Integrity and Maintenance Taylor & Francis

Bond characteristics between concrete and near-surface mounted carbon fiber reinforced polymer cords

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Bond characteristics between concrete and near-surface mounted carbon fiber reinforced polymer cords

Abstract

Previous studies showed that near-surface mounting (NSM) strengthening technique with rigid CFRP materials has potential advantages over the externally bonded reinforcing (EBR), therefore, it becomes efficient methodology for concrete strengthening. However, rigid NSM-CFRP cannot be wrapped around a deteriorated structural element; the need for the existence of flexible material has appeared. Therefore, in this study the flexible NSM-CFRP (cord) is investigated as strengthening technique...
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Publisher
Taylor & Francis
Copyright
© 2021 Korea Institute for Structural Maintenance and Inspection
ISSN
2470-5322
eISSN
2470-5314
DOI
10.1080/24705314.2021.1950379
Publisher site
See Article on Publisher Site

Abstract

Previous studies showed that near-surface mounting (NSM) strengthening technique with rigid CFRP materials has potential advantages over the externally bonded reinforcing (EBR), therefore, it becomes efficient methodology for concrete strengthening. However, rigid NSM-CFRP cannot be wrapped around a deteriorated structural element; the need for the existence of flexible material has appeared. Therefore, in this study the flexible NSM-CFRP (cord) is investigated as strengthening technique instead of rigid NSM-CFRP. The aim of this study is to recognize the parameters affecting the bond performance of carbon fiber-reinforced concrete (CFRP) cord and concrete. These parameters are cords’ bonded length, the ratio between cord’s width and depth, concrete compressive strength, number of CFRP cords used and the distance separating cords in multi-cord specimens. Fifty-four concrete prisms were cast from 25 MPa and 50 MPa concrete compressive strengths. Thirtyeight prisms reinforced by a single cord with various cord sizes were prepared. Twelve and four specimens were reinforced with two and three cords, respectively. In the case of multi-cord specimens, a unified bond length and cord’s aspect ratio were carried out. The main parameter to be studied in this case is the cords’ separating spacing. The test results indicated that increasing (NSMCFRP) cords bonded length, concrete compressive strength, number of applied CFRP cords, the spacing between cords and reducing cords’ aspect ratio (width/depth ratio) cause an increment in the pull-out force, and then a better strengthening is achieved. Rupture was the predominant failure mode for specimens with the same bond and equal cord dimension, while debonding of the CFRP cords is the most frequent failure mode for multi-cords specimens with greater spacing.

Journal

Journal of Structural Integrity and Maintenance – Taylor & Francis

Published: Oct 2, 2021

Keywords: Near-surface mounting (NSM); carbon fiber reinforced polymer (CFRP); cord; debonding; pullout load

References

  • Bond behavior of fiber reinforced polymer bars under direct pullout conditions
  • C127 standard test method for relative density (Specific gravity) and absorption of coarse aggregate
  • Effect of aggregate size on the bond behavior between carbon fiber–Reinforced polymer sheets and concrete
  • Bond behavior of FRP NSM systems in concrete elements
  • Near-surface mounted FRP reinforcement: An emerging technique for strengthening structures
  • Bond between near-surface mounted carbon-fiber-reinforced polymer laminate strips and concrete
  • Investigation of bond in concrete structures strengthened with near surface mounted carbon fiber reinforced polymer strips
  • Influence of surface roughness on the bond of FRP laminates to concrete
  • Bond between FRP and concrete in reinforced concrete beams strengthened with near surface mounted and externally bonded reinforcement
  • Corroded RC beam repaired with near-surface mounted CFRP rods
  • Characterization of FRP rods as near-surface mounted reinforcement
  • Experimental and numerical evaluations on the behaviour of structures repaired using prefabricated FRP composites jacket
  • Effect of varied surface roughness and concrete strength on the bond performance of FRP
  • Behavior of heat damaged circular reinforced concrete columns repaired using carbon fiber reinforced polymer rope
  • A new technique for repairing reinforced concrete columns
  • Bond behavior of near-surface mounted CFRP laminate strips under monotonic and cyclic loading
  • Performances, challenges and opportunities in strengthening reinforced concrete structures by using FRPs – A state-of-the-art review
  • Behaviour of concrete elements strengthened with near surface mounted CFRP strips under thermal cycles
  • Bond performance of near surface-mounted FRP bars
  • Debonding failures of RC beams strengthened with near surface mounted CFRP strips
  • The effect of surface preparation on the bond interface between FRP sheets and concrete members
  • Durability characteristics of concrete beams externally bonded with FRP composite sheets
  • Study on tensile properties of CFRP plates under elevated temperature exposure