New types of steel-FRP composite bar with round steel bar inner core: Mechanical properties and bonding performances in concrete

Zhao, Debo; Pan, Jun; Zhou, Yingwu; Sui, Lili; Ye, Zenghui

doi:10.1016/j.conbuildmat.2020.118062

Cited by 64 publications

(12 citation statements)

References 28 publications

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“…As the baseline, the bond strengths of steel bars have been commonly tested [ 93 , 94 , 95 , 96 ]. Long et al [ 93 ] concluded that shallow embedment length was a cause of pull-out failure, where the load–displacement curve had a hump and nearly constant residual force.…”

Section: Behavior Without Corrosionmentioning

confidence: 99%

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Anti-Corrosion Reinforcements Using Coating Technologies—A Review

et al. 2022

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Coated reinforcements are expected to improve the performance of reinforced concrete in aggressive environments, but different kinds of coated reinforcements can express a variety of properties, which can confuse researchers and engineers. This paper reviews the manufacture, corrosion mechanisms, behaviors, and applications of popular or promising coated reinforcements, incorporating galvanized reinforcements (GRs), epoxy coated reinforcements (ECRs), stainless cladding reinforcements (SCRs), and steel-fiber reinforced polymer composite bars (SFCBs). In terms of manufacture, GRs and ECRs should focus on minimizing the negative effect of manufacture on performance, while SCRs and SFCBs should reduce the cost and increase the production capacity. Behaviors of GRs and ECRs are primarily determined by the steel substrate, but the behaviors of SCRs and SFCBs are primarily affected by the coat and core, and their interaction. The corrosion mechanism of GRs and SCRs is about oxidation, while that of SFCBs is about hydrolysis. ECRs are usually corroded under film, which can be a cause of premature failure. Corrosion embrittles SCRs, as well as bare bars, but corrosion of SFCBs usually causes a reduction in maximum strength. The investigation of the corrosion behaviors of GRs and ECRs focuses on bond strength. GRs have controversial performance. ECRs have been proven to have drawbacks regarding bond strength. The use of anti-corrosion reinforcement is uneven in regions, which may correlate with the development of technology and the economy.

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Section: Behavior Without Corrosionmentioning

confidence: 99%

“…Although SFCBs improve the mechanical behavior of FRP bars, the bond strength of SFCBs still needs to be developed [ 94 ]. Surface-threaded treatment could develop the bond performance of SFCBs [ 94 ].…”

Section: Behavior Without Corrosionmentioning

confidence: 99%

Anti-Corrosion Reinforcements Using Coating Technologies—A Review

et al. 2022

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“…FRP bars are fabricated via a unidirectional pultrusion molding process, via the mixing of unidirectional long fibers and resin. e surface of the FRP bar can be treated as a ribbed bar to enhance the bonding capacity, in contrast to that of a round bar [91]. e FRP cable is a wirelike FRP product formed via unidirectional weaving of continuous long fibers followed by solidification with a small amount of resin or without resin.…”

Section: Frp Barsmentioning

confidence: 99%

Review of Experimental Studies on Application of FRP for Strengthening of Bridge Structures

Yuan

2020

Advances in Materials Science and Engineering

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In recent years, fiber-reinforced polymer (FRP) composites have been widely used as a new type of high-performance material in concrete structures. FRP composites have the advantages of high strength, light weight, and corrosion resistance. Based on existing studies in the literature, this paper reviews the development and applications of FRP materials for the strengthening and rehabilitation of bridge structures. The types and properties of FRP composites are summarized, and the applications and development of FRP sheets, FRP bars, FRP grids, and prestressed FRP tendons for bridge structures are discussed. Different types of FRP composites result in different failure characteristics and bearing capacities. Moreover, this paper covers the FRP strengthening methods and the response properties of the flexural performance, bonding performance, and ductility. Significant conclusions regarding the strengthening/repair of bridge structures with FRP composites are presented. The review details the current state of knowledge and research on strengthening bridge structures with FRP composites and is helpful for better understanding and establishing design criteria.

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“…It is composed of a crescent‐rib steel bar and an outer protruded fiber‐reinforced polymer (FRP) layer, as shown in Figure 1. SFCB has a good bonding property with concrete 2,3 and is excepted to be an ideal reinforcement for concrete structures subject to the high earthquake risk area or the high corrosion environment due to its unique post‐yield stiffness and superior anti‐corrosion behavior 1,4,5 …”

Section: Introductionmentioning

confidence: 99%

Visual damage identification of concrete cylinders with steel‐fiber‐reinforced composite bars based on acoustic emission

Guo

Chen

Tang

et al. 2021

Structural Contr & Hlth

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Steel-fiber-reinforced composite bar (SFCB) is a composite bar composed of a crescent-rib steel bar and an outer protruded fiber-reinforced polymer (FRP) layer. Due to its unique post-yield stiffness and superior anti-corrosion behavior, the SFCB is except to be an ideal reinforcement for concrete structures subject to a high corrosion environment. For SFCB-reinforced concrete cylinders, their internal damage mechanism has never been experimentally studied but was usually speculated with the brittle failure due to the potential brittle fracture of the SFCB. To reveal the compression damage mechanism of SFCBreinforced concrete cylinders, a uniaxial compression test for SFCB-reinforced concrete cylinders was carried out at first. The entire damage process of SFCBreinforced concrete cylinders was monitored in real-time by acoustic emission (AE), a widely used nondestructive testing method. The test result shows that the SFCB-reinforced concrete cylinders fail after the buckling of longitudinal SFCB or the fracture of the stirrup. The intensity signal analysis of AE proves the failure mode of the SFCB-reinforced concrete cylinder was close to a plastic failure instead of a brittle failure. Furthermore, a new damage visualization method is proposed to analyze the internal damage of the concrete cylinders by using the spatial b value of AE. The T value was constructed by combining the spatial b value with the density distribution of AE events. It is proven that the T value is highly sensitive to the serious damages of the concrete cylinders and can be used to identify the damage locations inside the concrete cylinders.acoustic emission, concrete cylinder, damage identification, steel-fiber-reinforced composite bar, uniaxial compression | INTRODUCTIONSteel-fiber-reinforced composite bar (SFCB) is a type of composite bar developed almost a decade ago. 1 It is composed of a crescent-rib steel bar and an outer protruded fiber-reinforced polymer (FRP) layer, as shown in Figure 1. SFCB has a good bonding property with concrete 2,3 and is excepted to be an ideal reinforcement for concrete structures subject to the high earthquake risk area or the high corrosion environment due to its unique post-yield stiffness and superior anti-corrosion behavior. 1,4,5

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New types of steel-FRP composite bar with round steel bar inner core: Mechanical properties and bonding performances in concrete

Cited by 64 publications

References 28 publications

Anti-Corrosion Reinforcements Using Coating Technologies—A Review

Anti-Corrosion Reinforcements Using Coating Technologies—A Review

Review of Experimental Studies on Application of FRP for Strengthening of Bridge Structures

Visual damage identification of concrete cylinders with steel‐fiber‐reinforced composite bars based on acoustic emission

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