Comparative Investigation on Tensile Performance of FRP Bars after Exposure to Water, Seawater, and Alkaline Solutions

Lu, Chenghao; Ni, Mingzhi; Chu, Tianshu; He, Liyuan

doi:10.1061/(asce)mt.1943-5533.0003243

Cited by 64 publications

(23 citation statements)

References 33 publications

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“…After that, the strength degradation became slow in the further exposure period. This phenomenon was consistent with the exponential degradation models which believe that the degradation rate of tensile strength of GFRP bars is high in the initial stage, and then decreases with increasing exposure time [15,16,24]. Their degradation mechanisms related to GFRP bars are assumed to be debonding at the interface between fibers and matrix and they had been successfully applied to fit the short-term experimental data of tensile strength retention of GFRP bars immersed in environmental solutions [16,25].…”

Section: Tensile Strength Retentionsupporting

confidence: 81%

“…During the period of anchor installation, aluminum caps were settled at the edge of the anchors in order to close both ends of the steel pipe and ensure the bar placed in the center of the steel pipe. For the purpose of establishing an enough adhesive force between the GFRP bar and the anchor [15,16,21], the galvanized steel pipes were grouted with an epoxy resin of WSR618 (E-51) with the mass ratio (the epoxy resin to the curing agent) of 4:1. After a week, the conditioned GFRP bars were immersed in three prepared solution containers, as shown in Figure 2.…”

Section: Natural Aggressive Environmental Conditionsmentioning

confidence: 99%

“…Therefore, the investigation on the long-term performance of GFRP bars is clamant and significant when they are adopted in civil engineering environment with natural temperatures. Lu et al [16] compared the degradation of tensile properties of three categories of FRP bars, including BFRP, CFRP and GFRP, immersed in water, seawater solution and alkaline solution under room temperature (around 20 ∘ C) and found that GFRP bars showed more decline of tensile strength in water and alkaline solutions than BFRP and CFRP bars. Besides, with the development of new GFRP bars, the producers claim that their current GFRP bars have better mechanical properties and show higher resistance to aggressive environments especially the water and alkaline solutions [10,14].…”

Section: Introductionmentioning

confidence: 99%

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Mechanical and durability properties of GFRP bars exposed to aggressive solution environments

Yang

2021

Science and Engineering of Composite Materials

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Two categories of GFRP specimens, in nominal diameters of 11.2 mm and 15.6 mm respectively, made of E-glass fibers and a vinylester resin were immersed in alkaline solution, saline solution and tap water solution at room temperature. The mechanical and durability properties of tested GFRP bar specimens were determined through direct tensile test and short-beam shear test after exposure to aggressive solutions for different days. The obtained results indicated that for all tested GFRP bar specimens the failure modes of fiber rupture in the tensile test and horizontal cracking in the short-beam shear test would not obviously change with the increasing of exposure period. However, the impact of immersion solutions on the durability degradation of mechanical properties of GFRP bars appeared in the ultimate strength and displacement at failure, and at room temperature the alkaline solution had a greater impact than another two solutions. Under the same exposure conditions, the resistance to the strength degradation of the GFRP bars with a larger diameter was better than that of the smaller GFRP bars. The comparison results indicated that the strength degradation trend of conditioned GFRP bars presented in our study was basically in agreement with the data given in previous studies.

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Section: Tensile Strength Retentionsupporting

confidence: 81%

Section: Natural Aggressive Environmental Conditionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Mechanical and durability properties of GFRP bars exposed to aggressive solution environments

Yang

2021

Science and Engineering of Composite Materials

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“…Steel corrosion is considered to be the primary cause for performance degradation of concrete structure, which results in high maintenance and reinforcement costs (Koch et al 2002;Ruan et al 2020;Lu et al 2020). In order to mitigate this problem and further improve the structural durability, fiber reinforced polymer (FRP) bar, as one new high-performance composite material made of continuous fiber and resin, is selected as one kind of internal reinforcing bar used in concrete structures, since FRP bars generally have the advantages of high stiffness weight ratio, high strength weight ratio, low cost performance ratio and excellent corrosion resistance (Robert et al 2009;Yan et al 2016).…”

Section: Introductionmentioning

confidence: 99%

Bond Behavior of GFRP-Concrete Under Long-term Exposure to Aggressive Environments

Zheng

et al. 2020

ACT

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“…Studies have shown that up to 40% of the tensile strength of GFRP bars can be lost after exposure to a combination of ultraviolet rays and moisture tests with and without loading [ 47 ]. Tensile tests of GFRP, BFRP, and CFRP bars, made of vinyl ester resin, conducted after immersion in tap water (pH = 7.00) for 180 days, showed various degrees of degradation [ 48 ]. BFRP and CFRP bars retained nearly 89% of the tensile strength, while GFRP retained 78%.…”

Section: Durabilitymentioning

confidence: 99%

Durability and Mechanical Properties of Concrete Reinforced with Basalt Fiber-Reinforced Polymer (BFRP) Bars: Towards Sustainable Infrastructure

2021

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Reducing the fingerprint of infrastructure has become and is likely to continue to be at the forefront of stakeholders’ interests, including engineers and researchers. It necessary that future buildings produce minimal environmental impact during construction and remain durable for as long as practicably possible. The use of basalt fiber-reinforced polymer (BFRP) bars as a replacement for carbon steel is reviewed in this article by examining the literature from the past two decades with an emphasis on flexural strength, serviceability, and durability. The provisions of selected design and construction guides for flexural members are presented, compared, and discussed. The bond of BFRP bars to the surrounding concrete was reportedly superior to carbon steel when BFRP was helically wrapped and sand coated. Experimental studies confirmed that a bond coefficient kb = 0.8, which is superior to carbon steel, may be assumed for sand-coated BFRP ribbed bars that are helically wrapped, as opposed to the conservative value of 1.4 suggested by ACI440.1R-15. Code-based models overestimate the cracking load for BFRP-reinforced beams, but they underestimate the ultimate load. Exposure to an alkaline environment at temperatures as high as 60 °C caused a limited reduction in bond strength of BFRP. The durability of BFRP bars is influenced by the type of resin and sizing used to produce the bars.

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Comparative Investigation on Tensile Performance of FRP Bars after Exposure to Water, Seawater, and Alkaline Solutions

Cited by 64 publications

References 33 publications

Mechanical and durability properties of GFRP bars exposed to aggressive solution environments

Mechanical and durability properties of GFRP bars exposed to aggressive solution environments

Bond Behavior of GFRP-Concrete Under Long-term Exposure to Aggressive Environments

Durability and Mechanical Properties of Concrete Reinforced with Basalt Fiber-Reinforced Polymer (BFRP) Bars: Towards Sustainable Infrastructure

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