Efficient near surface mounted CFRP shear strengthening of high strength prestressed concrete beams – An experimental study

Kuntal, Vikas Singh; Chellapandian, M.; Prakash, Shamsher

doi:10.1016/j.compstruct.2017.07.095

Cited by 55 publications

(23 citation statements)

References 18 publications

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“…As one can see, the lateral faces of the corbels were cut using a diamond saw, and CFRP laminate strips of 2 mm by 16 mm were attached into the slits using epoxy adhesive. This technique, known as near-surface mounted (NSM), is attractive if the reinforcement concrete cover is large enough, and its efficiency has been proven by several researchers (Kuntal et al [6], Al-Mahmoud et al [7] and Barros and Dias [8]). Corbel strengthened using carbon fiber reinforced polymers (CFRP) laminate strips using the near surface mounted method: (a) cut of the lateral faces; (b) lateral cut finished; (c) laminate strips glued with resin epoxy in the slits; and (d) reinforced concrete corbel strengthened with CFRP laminate strips being tested.…”

Section: J Compos Sci 2019 3 X 2 Of 13mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Reinforced Concrete Corbel Strengthened Using Carbon Fiber Reinforced Polymer (CFRP) Sheets

2019

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This paper presents and discusses the procedures adopted for repairing and strengthening a damaged reinforced concrete corbel of an industrial biomass boiler. The reinforced concrete corbel was subjected to concrete spalling, favoring the risk of the main tie reinforcement slip in the anchorage zone. The proposed solution involved a local repair with a polymeric mortar and subsequent strengthening using carbon fiber reinforced polymer (FRP) sheets, attending the requirements imposed by the in site conditions and the design plans. The intervention allowed the confinement of the concrete zone subjected to spalling and provided additional safety for the main tie reinforcement of the corbel. The applied technique was demonstrated to be fast, reliable, practical, and cheaper than other available solutions, such as section enlargements with concrete jacketing.

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Section: J Compos Sci 2019 3 X 2 Of 13mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Reinforced Concrete Corbel Strengthened Using Carbon Fiber Reinforced Polymer (CFRP) Sheets

2019

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“…e greater confinement granted by the adhesive and the surrounding concrete is considered the best advantage provided by the NSM method [2]. is strengthening technique has already been proven to be effective for the shear strengthening [3][4][5][6] and flexural strengthening of RC beams [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22]. Many studies have used conventional steel bars instead of FRP materials for beam strengthening by employing the NSM method [21,[23][24][25][26][27][28][29].…”

Section: Introductionmentioning

confidence: 99%

“…Many studies have applied the NSM FRP strengthening method to improve the flexural and shear strength of RC beams [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22], whilst others have used conventional steel bars instead of FRP materials for flexural and shear strengthening [21][22][23][24][25][26][27][28]. However, only few of these studies have focused on torsion strengthening [29][30][31]32] and no previous work has investigated the application of conventional steel bars for the torsion strengthening of RC beams.…”

Section: Introductionmentioning

confidence: 99%

Torsional Strengthening of RC Beams with Near‐Surface Mounted Steel Bars

Askandar

Mahmood

2020

Advances in Materials Science and Engineering

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e strength of reinforced concrete members can be enhanced by using the externally bonded reinforcement (EBR) and nearsurface mounted (NSM) methods. However, very few studies have adopted the NSM method for torsional strengthening. Although previous studies have reported the efficacy of using epoxy-resin-bonded NSM steel bars in increasing the flexural and shear strength of RC beams, no study has examined the use of steel bars and epoxy adhesives for torsional strengthening.erefore, this study investigates the behaviour of RC beams subjected to the combined actions of torsion and bending moment when they are strengthened with NSM steel bars (Ø10 mm) in different configurations. e practical part of this investigation consisted of seven cast and tested beams of 150 × 250 × 2000 mm dimensions. One beam was reference, which is not strengthened; meanwhile, all the other beams were strengthened with two U-shape-welded NSM steel bars. During the testing process, the twist angle at the torque intervals, first cracking torque, ultimate torque, and ultimate twist angle of the conventional beam were compared with those of the strengthened beams. e torsional performance of the RC beams was significantly improved by using NSM steel bars, whereas in various NSM configurations, the 90°NSM beams outperformed the 45°NSM beams.

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“…Fibers 2020, 8, 40; doi:10.3390/fib8060040 www.mdpi.com/journal/fibers For this reason, there is no unique way to design for FRP shear strengthening [8][9][10][11][12][13][14][15]. Owing to these reasons, the shear behavior of FRP strengthened prestressed concrete members is not fully understood due to its complex nature and tendency to brittle failure [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Effectiveness of Inorganic Bonding Materials for Near-Surface Mounting Shear Strengthening of Prestressed Concrete Beams

Kuntal

Chellapandian

Prakash

et al. 2020

Fibers

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Use of organic resins such as epoxy and vinyl esters as bonding materials in fibre reinforced polymer (FRP) strengthening of concrete members is widely accepted. However, the performance of organic resins is compromised when exposed to high temperature and extreme weather conditions leading to reduced durability of the strengthened systems. The present study attempts to evaluate the effectiveness of inorganic (cement mortar and geopolymer mortar) bonding materials for shear strengthening of prestressed concrete (PSC) beams using the near-surface mounting (NSM) technique. Different types of bonding materials are used in this study for NSM shear strengthening including: (i) epoxy resin, (ii) high strength cement grout (HSCG) and (iii) geopolymer mortar. Bond tests were first conducted to evaluate the pull-out/bond strength of different bonding materials. Bond tests revealed that epoxy resin had the highest bond strength followed by geopolymer mortar and HSCG. Sixteen full-scale PSC beams were cast with and without stirrups. The beams were strengthened using NSM CFRP laminates oriented at 45-degree configuration and then tested under a three-point bending configuration. Experimental results revealed that the performance of high strength cement grout and geopolymer mortar was similar but with a lesser efficiency compared to the epoxy resin.

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Efficient near surface mounted CFRP shear strengthening of high strength prestressed concrete beams – An experimental study

Cited by 55 publications

References 18 publications

Reinforced Concrete Corbel Strengthened Using Carbon Fiber Reinforced Polymer (CFRP) Sheets

Reinforced Concrete Corbel Strengthened Using Carbon Fiber Reinforced Polymer (CFRP) Sheets

Torsional Strengthening of RC Beams with Near‐Surface Mounted Steel Bars

Experimental Study on the Effectiveness of Inorganic Bonding Materials for Near-Surface Mounting Shear Strengthening of Prestressed Concrete Beams

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