Experimental and theoretical studies on bond behavior between concrete and FRP bars with different surface conditions

Chen, Lijie; Liang, Kun; Shan, Zhiwei

doi:10.1016/j.compstruct.2023.116721

Cited by 28 publications

(10 citation statements)

References 25 publications

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“…During the initial loading stage, the bond stress was mainly provided by the chemical adhesion [33]. However, the chemical adhesive force disappeared once a slight slip occurred, owing to the separation of bars and concrete [45]. At this stage, relative slip between BFRP bars and concrete occurred on the inclined plane where their ribs came into contact (Figure 6).…”

Section: Resultsmentioning

confidence: 99%

Bond Performance between Fiber-Wrapped Ribbed Basalt Fiber-Reinforced Polymer Bars and Seawater Sea-Sand Concrete

Lin,

Weng,

Xiao

et al. 2023

Buildings

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The high corrosion resistance of fiber-reinforced polymers (FRPs) and related concrete structures means that they are suitable for application in the marine environment. Therefore, the replacement of steel bars with fiber-reinforced polymer (FRP) bars enhances corrosion resistance in seawater sea-sand concrete (SSC) structures. Geometric parameters significantly influence the performance of the bond between ribbed FRP bars and SSC, thereby affecting the mechanical properties of the concrete structures. In this study, the performance of the bond between ribbed (i.e., with fiber wrapping) basalt-fiber-reinforced polymer (BFRP) bars and SSC was investigated through pull-out tests that considered rib geometry and SSC strength. The results demonstrated that an increase in rib and dent widths reduced the bond stiffness, while an increase in rib height and SSC strength gradually increased the bond stiffness and strength. Additionally, the bond stiffness and bond strength were relatively low because the surface fiber bundles buffered the mechanical interlocking force between the BFRP ribs and the concrete, resulting in plastic bond failure during the loading process. Furthermore, the adhesion of the fiber bundles to the surface of the BFRP bars also influenced bond performance, with higher adhesion leading to greater bond stiffness and strength.

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Section: Resultsmentioning

confidence: 99%

Bond Performance between Fiber-Wrapped Ribbed Basalt Fiber-Reinforced Polymer Bars and Seawater Sea-Sand Concrete

Lin,

Weng,

Xiao

et al. 2023

Buildings

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“…Some basalt fiber products have already exceeded the tensile strength of glass fibers, with a superior elastic modulus compared to glass fibers [18,19]. Basalt fibers are derived from mineral ores, and their chemical composition is highly compatible with concrete, ensuring a good bond with the concrete material [20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Study of the Mechanical Performance of Grid-Reinforced Concrete Beams with Basalt Fiber-Reinforced Polymers

Li,

Qi,

et al. 2024

Applied Sciences

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Basalt fiber-reinforced polymers (BFRPs) can reduce construction costs and mitigate corrosion-related issues associated with steel-reinforced concrete structures. There is limited research on completely substituting steel cages with composite material grid structures. Combining BFRP grids with concrete is an effective solution to address the issue of poor corrosion resistance; BFRP grids also have a good bond with steel-reinforced concrete. Therefore, this paper introduces a novel BFRP grid-reinforced concrete beam. Flexural tests indicate that grid frameworks with 3 mm and 5 mm thickness combined with concrete exhibit higher flexural load-bearing capacity. Shear tests show that the shear load-bearing capability is influenced by the shear span ratio. Shear load-bearing capacity decreases when the shear span ratio rises, but only up to a certain point. Theoretical calculations for grid-reinforced concrete beams are made to demonstrate good conformity with test values. Based on the research findings, design recommendations and precise measurements for the internal grid frameworks for composite material grid-reinforced concrete beams are provided.

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“…This material choice is associated with expected weight savings, reduced fuel consumption, and environmental benefits. In addition, it is worth noting that FRP (fiber-reinforced polymer) can serve as a corrosion-resistant alternative to steel reinforcement bars, offering further application flexibility [ 3 , 4 , 5 ]. However, CFRPs currently suffer from resource inefficiency, involving high energy demands during manufacturing and limited recycling options, resulting in a significant portion of composites ending up in landfills [ 6 , 7 ].…”

Section: Introductionmentioning

confidence: 99%

A Preliminary Investigation on a Water- and Acetone-Based Solvolysis Recycling Process for CFRPs

Vogiantzi,

Tserpes

2024

Materials

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Composites, and especially carbon-fiber-reinforced plastics (CFRPs), are increasingly used in the automotive, aerospace, and aviation industries, and as a result, CFRP production has increased dramatically, leading to a corresponding increase in waste. Landfills and the incineration of waste are likely to be restricted as a result of legislation, thus highlighting the need for efficient recycling methods for CFRPs. However, the recycling of CFRPs is very challenging, mainly due to the difficulty of removing their thermosetting matrix. This study reports a pre-screening of the solvolysis recycling process for CFRPs based on the mechanical properties of the recovered fibers. To this end, solvolysis tests were conducted on unidirectional CFRP samples under supercritical and subcritical conditions using acetone and water. The solvolysis tests were conducted for various conditions of temperature, pressure, and reaction time, without the use of any catalyst. Also, the loading rate (volume of solvent/volume of reactor) was constant. The efficiency of the recycling processes has been evaluated through a morphological and a mechanical characterization of the recovered fibers. In most cases, the decomposition efficiency of the epoxy resin, measured in terms of mass, ranged between 90 and 100%. Moreover, the scanning electron microscopy images of the recovered fibers showed negligible traces of resin residues and no detectable signs of physical damage or any changes in morphology with regard to diameter. Finally, the single-fiber tension tests revealed that that the recovered fibers retained more than 61% of their initial Young’s modulus and 70% of their tensile strength.

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Experimental and theoretical studies on bond behavior between concrete and FRP bars with different surface conditions

Cited by 28 publications

References 25 publications

Bond Performance between Fiber-Wrapped Ribbed Basalt Fiber-Reinforced Polymer Bars and Seawater Sea-Sand Concrete

Bond Performance between Fiber-Wrapped Ribbed Basalt Fiber-Reinforced Polymer Bars and Seawater Sea-Sand Concrete

Study of the Mechanical Performance of Grid-Reinforced Concrete Beams with Basalt Fiber-Reinforced Polymers

A Preliminary Investigation on a Water- and Acetone-Based Solvolysis Recycling Process for CFRPs

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