Durability of glass fiber-reinforced polymer bars in water and simulated concrete pore solution

Yu, Yixun; Liu, Shuai; Pan, Yunfeng; Miu, Xinbo; Liu, Jintao

doi:10.1016/j.conbuildmat.2021.123995

Cited by 13 publications

(4 citation statements)

References 33 publications

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“…It was reported that the volume of GFRP bar expanded after water absorption (Sun et al, 2022). A more extended immersion periods (e.g., 544 days) cause the deterioration of the outside of the GFRP bar (Yu et al, 2021). It causes the reduction of the bond strength of the GFRP bar–concrete specimen immersed in distilled water for 544 days (Gravina et al, 2020).…”

Section: Resultsmentioning

confidence: 99%

Durability of bond between carbon/glass hybrid fiber-reinforced polymer (HFRP) bar and concrete in water

Pan

et al. 2023

Advances in Structural Engineering

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Glass-fiber-reinforced polymer (GFRP) bars have been widely used as a reinforcement in concrete, and glass fibers are susceptible to reacting with alkali ions in concrete pores. Thus, carbon fibers are wrapped around GFRP bars to produce carbon/glass hybrid fiber-reinforced polymer (HFRP) bars so as to promote the durability of the internal GFRP bars in concrete. This work studies the durability of the interfacial bond between GFRP bars/HFRP bars and concrete using pullout tests. The specimens are tested after immersion in distilled water for 0, 150, 255, and 544 days. The failure of the GFRP bar–concrete composite is due to damage to the GFRP bar, while the HFRP bar–concrete composite fails because of a combination of the scratching of the HFRP bar and the failure of the concrete. Both HFRP and GFRP bars are scratched as the immersion period extends. Further, the strength of the bond between the HFRP bar and concrete is lower than that of the bond between the GFRP bar and concrete, while the bond stiffness of the HFRP bar–concrete composite is higher than that of the GFRP bar–concrete composite. The bond strength of the HFRP bar–concrete and GFRP bar–concrete composites increases in the early immersion periods but decreases after 544 days of immersion in water. The retention of the bond strength of the HFRP bar–concrete composite is superior to that of the GFRP bar–concrete composite. The carbon fiber coat is proven to improve the durability of the bond between HFRP bars and concrete in water. A formula for predicting the bond strength of HFRP bar–concrete and GFRP bar–concrete composites in water is also developed. Finally, the modeling results demonstrate that the bond strength retention of the HFRP bar–concrete and GFRP bar–concrete composite is 76% and 46% after 50 years of service time, respectively.

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Section: Resultsmentioning

confidence: 99%

Durability of bond between carbon/glass hybrid fiber-reinforced polymer (HFRP) bar and concrete in water

Pan

et al. 2023

Advances in Structural Engineering

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“…The drop in tensile strength of GFRP bars may be attributed to the deterioration in resin matrix and glass fiber. Furthermore, the degradation of the fiber–matrix interface due to the damage caused to the outer layer of bars seems to result in debonding of fibers and hence loss of tensile strength 54 …”

Section: Results and Analysesmentioning

confidence: 99%

“…Furthermore, the degradation of the fiber-matrix interface due to the damage caused to the outer layer of bars seems to result in debonding of fibers and hence loss of tensile strength. 54…”

Section: Tensile Strengthmentioning

confidence: 99%

Factors influencing strength loss of glass‐fiber‐reinforced composite bars in highly alkaline environment of concrete

Nassar

Dominguez

Soroushian

et al. 2022

Structural Concrete

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Steel corrosion is a significant problem of concrete‐based infrastructure, and it increases the repair costs of the damage to structures. Glass‐fiber‐reinforced polymer (GFRP) composite bars are corrosion‐proof and exhibit relatively higher strength than ordinary steel reinforcement. However, GFRP bars degrade when exposed to the highly alkaline environment of concrete over extended periods. This study focuses on the effect of the high alkalinity of concrete on the tensile strengths of several types of GFRP bars. Different accelerated aging techniques were employed to evaluate the effects of GFRP characteristics (fiber volume fraction, matrix composition, bar diameter, and presence of protective coating) on the alkali resistance. The test results indicated that the alkali attack significantly decreased the tensile strength of GFRP, increasing with age. The alkali resistance of the GFRP bars increased up to a fiber volume fraction of 50% but decreased when the fiber volume fraction increased to 60% and above. The effects of protective coating on alkali resistance were generally positive but not consistent, and the effects of the matrix type and bar diameter on the alkali resistance of GFRP bars were insignificant. Accelerated aging did not change the bond strength but altered the failure mechanism associated with the bond failure of the specimens.

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“…The concrete pore solution is alkaline, and its pH ranges from 12.7 to 13.6 (Chen et al, 2007). Hydroxide ions etches glass fibers under alkaline conditions (Kamal and Boulfiza, 2011; Yu et al, 2021a), and GFRP bar deteriorates, followed by the weak bond of the GFRP bar to concrete (Alves et al, 2011; Micelli and Nanni, 2004). The application of a carbon fiber coating on the GFRP has been demonstrated to enhance the durability of the GFRP material (Pan and Yan, 2021a).…”

Section: Introductionmentioning

confidence: 99%

Experimental study on bond performance between carbon/glass-hybrid-fiber-reinforced polymer bars and concrete

Liang,

Yu,

et al. 2023

Advances in Structural Engineering

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Coating GFRP bars with a layer of carbon fibers containing carbon/glass-hybrid-fiber-reinforced polymer (HFRP) bars has been proven to improved interlaminar shear durability. Thus, the bond performance of the HFRP bar-concrete interface depends on the behavior of the HFRP-reinforced concrete structure. In this context, the study investigates the effects of the compressive strength of concrete and the embedded length of HFRP bars on the bond behavior of the HFRP bar-concrete interface and compares the results with the data on the interfacial bond of GFRP bar to concrete. The results demonstrate that all the specimens fail at the FRP bar–concrete interface under the pullout. The bond strength and bond stiffness of the HFRP bar–concrete composites decrease with an increase in the embedded length of the HFRP bar from 4 to 10 times its diameter. Raising the compressive strength of the concrete enlarges the bond strength and bond stiffness of the HFRP bar–concrete composites. Furthermore, the outer layer of carbon-fiber on the GFRP bar decreases the impact of the embedded length of the HFRP bar on the bond strength and bond stiffness of the HFRP bar–concrete composites. Finally, the improved modified mBPE model can accurately predict the bond stress–slip relationship of GFRP/BFRP/HFRP bar–concrete composites.

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Durability of glass fiber-reinforced polymer bars in water and simulated concrete pore solution

Cited by 13 publications

References 33 publications

Durability of bond between carbon/glass hybrid fiber-reinforced polymer (HFRP) bar and concrete in water

Durability of bond between carbon/glass hybrid fiber-reinforced polymer (HFRP) bar and concrete in water

Factors influencing strength loss of glass‐fiber‐reinforced composite bars in highly alkaline environment of concrete

Experimental study on bond performance between carbon/glass-hybrid-fiber-reinforced polymer bars and concrete

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