Experimental investigation on shear strengthening with fiber/textile reinforced concrete

Rossi, Edoardo; Randl, Norbert; Mészöly, Tamás; Harsányi, Peter

doi:10.1002/suco.202200682

Cited by 4 publications

(2 citation statements)

References 39 publications

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“…These advantages include a high strength-to-weight ratio (i.e., outstanding mechanical properties), low thermal conductivity, high durability (noncorrosive), electromagnetic neutrality, rapid execution with less labor and ease of handling, as well as lower installation and reduced maintenance costs, reduced mechanical fixing, excellent malleability and unlimited availability in size (i.e., dimensions) and geometry. 2,[9][10][11][12][16][17][18][19][20][21][22][23][24][25][26][27][28] FRP materials can be applied using different methods to rehabilitate concrete structures. 2,23 The externally bonded reinforcement (EBR) system is the most common strengthening/retrofitting system for RC structures and has become a prevalent technique over the last two decades.…”

Section: Introductionmentioning

confidence: 99%

A review on retrofitting concrete members with near‐surface mounted‐fiber reinforced polymer composites

Al‐Zu'bi,

Fan,

Bertolesi

et al. 2024

Structural Concrete

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In an era flooded with a multitude of studies investigating the performance of concrete structures retrofitted using fiber‐reinforced polymer (FRP) materials, this review addresses the critical need for a comprehensive overview of the retrofitting of concrete members using near‐surface mounted (NSM)‐FRP composites, aiming to save time and effort while providing engineers and research community with valuable resources relevant to the field. This review focuses on the key factors influencing both the flexural and shear retrofitting processes of reinforced concrete (RC) beams, such as the percentage, type, size and geometry of NSM‐FRP reinforcement, as well as groove design, groove‐filling materials and beam depth. Moreover, the paper explores the failure modes associated with each retrofitting type, for example, debonding failures, shear/flexural failure and rupture of steel or NSM‐FRP reinforcement, to name a few. The review also delves into the bond behavior of NSM‐FRP‐bonded joints, examining factors, such as the bonded length, surface texture of NSM‐FRP reinforcement and type of bonding agent, which would affect the bond behavior and strength of the joints. The failure mechanisms associated with the bonded joints, such as interfacial bond failure, FRP rupture and splitting of the adhesive cover, are also highlighted. Finally, this compilation aims to guide engineers and researchers by offering a critical and comprehensive database for optimal designs, further development and suggesting future research directions.

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Section: Introductionmentioning

confidence: 99%

A review on retrofitting concrete members with near‐surface mounted‐fiber reinforced polymer composites

Al‐Zu'bi,

Fan,

Bertolesi

et al. 2024

Structural Concrete

View full text Add to dashboard Cite

show abstract

“…To achieve significant improvements in bending strength, the retrofitting of high-polymer composite materials has been explored [ 8 , 9 , 10 , 11 ]. Notably, the application of carbon fiber sheets as reinforcement on the underside of test specimens during flexural tests has demonstrated substantial enhancements in flexural strength [ 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 ].…”

Section: Introductionmentioning

confidence: 99%

Use of Geopolymer and Carbon Fiber-Reinforced Polymer for Repairing Reinforced Concrete Deck Soffit

Hao

Syu

et al. 2023

Materials

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This study aimed to assess the feasibility of utilizing geopolymer for repairing reinforced concrete beams. Three types of beam specimens were fabricated: benchmark specimens without any grooves, rectangular-grooved beams, and square-grooved beams. The repair materials employed included geopolymer material, and epoxy resin mortar, while carbon fiber sheets were used as reinforcement in select cases. The repair materials were applied to the rectangular and square-grooved specimens, with the carbon fiber sheets attached to the tension side of the specimens. To evaluate the flexural strength of the concrete specimens, a third-point loading test was conducted. The test results indicated that the geopolymer exhibited higher compressive strength and shrinkage rate compared to the epoxy resin mortar. Furthermore, the specimens reinforced with carbon fiber sheets demonstrated even greater strength than the benchmark specimens. In terms of flexural strength under cyclic third-point loading tests, the carbon fiber-reinforced specimens exhibited the ability to withstand over 200 cycles of repeated loading at 0.8 times the ultimate load. In contrast, the benchmark specimens could only withstand seven cycles. These findings highlight that the use of carbon fiber sheets not only enhances compressive strength but also improves resistance to cyclic loading.

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Trio/hybrid fiber effect on the geopolymer reinforced concrete for flexural and shear behavior

Bayrak

2024

Structural Concrete

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Geopolymer concrete (GC) is an innovative and sustainable type of composite resulting from the chemical reaction between waste materials containing and alkaline activators. The researchers have been focused to reduction of the greenhouse‐gas release, especially during the production of cement. Although numerous studies have been conducted on alkali‐activated cement or GC at the material level, there is limited research in the literature on the structural performance of reinforced GC members. The aim of this study is to investigate the effect of fiber combination on the shear and flexural performance of RC beams with maximum and minimum reinforcement ratio. To investigate the shear and flexural behavior of GC beam, four‐point and three‐point tests were performed on 12 GC with hybrid fibers, 4 GC with trio fibers, and 2 GC fiber‐free as references beams. The test parameters were the combination of fibers (steel, glass, carbon, and basalt), the longitudinal reinforcement ratio, and loading type. The key test results include the load‐deflection behavior, characteristics of the cracks, the effect of fiber type on the shear and flexural performance, ductility and stiffness properties, microstructure, the strain in the concrete, and the bars and code predictions. The test results showed that as expected, reducing the longitudinal reinforcement ratio decreased the strength, but the decrease in strength was tolerated by using different types of fibers. The use of trio fibers in beams under bending increased the strength capacity, considerably. Finally, the capacity prediction performance of current codes, that is, GB50010, EuroCode‐2, TS500, and ACI318, were also examined, and the calculations resulted that the current code equations had a percentage error of approximately 25% and 82% on average for flexural and shear, respectively, although EuroCode‐2 equations performed slightly better.

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Experimental investigation on shear strengthening with fiber/textile reinforced concrete

Cited by 4 publications

References 39 publications

A review on retrofitting concrete members with near‐surface mounted‐fiber reinforced polymer composites

A review on retrofitting concrete members with near‐surface mounted‐fiber reinforced polymer composites

Use of Geopolymer and Carbon Fiber-Reinforced Polymer for Repairing Reinforced Concrete Deck Soffit

Trio/hybrid fiber effect on the geopolymer reinforced concrete for flexural and shear behavior

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