Effect of alkalinity on the shear performance degradation of basalt fiber-reinforced polymer bars in simulated seawater sea sand concrete environment

Yi, Yong; Guo, Shuaicheng; Li, Sheng; Rahman, Zahidur; Zhou, Linlin; Shi, Caijun; Zhu, Deju

doi:10.1016/j.conbuildmat.2021.123957

Cited by 76 publications

(6 citation statements)

References 50 publications

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“…Furthermore, the decrease in ILSS was found to be greater than that in TSS. Similar results were consistent with the findings in the literature 12,48 . Notably, the ILSS retention of BFRP coated with SSGM at 4% alkali content showed a slight increase at an early immersion age.…”

Section: Resultssupporting

confidence: 93%

“…Similar results were consistent with the findings in the literature. 12,48 Notably, the ILSS retention of BFRP coated with SSGM at 4% alkali content showed a slight increase at an early immersion age. After 60 days of immersion, the increases in strength retention were 16.3%, 6.7%, and 3.7% at RT, 40 and 60 C, respectively.…”

Section: Effect Of Elevated Temperature and Prestressmentioning

confidence: 99%

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Shear performance degradation of basalt fiber‐reinforced polymer bars in seawater environments: Coupled effects of seawater sea‐sand geopolymer mortar coatings and sustained loading

Jiang,

Zhao,

Xie

et al. 2023

Polymer Composites

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Geopolymers, as a promising substitute for ordinary cement, exhibit different coating effects with regard to the durability of basalt fiber‐reinforced polymer (BFRP) bars. In this study, a comparative investigation was carried out on the shear performance of prestressed BFRP bars coated with seawater sea‐sand geopolymer mortar (SSGM). The alkaline content of the SSGM was 4% or 6%. The prestress level was 20% of the ultimate tensile strength at room temperature. The immersion temperatures were room temperature (RT), 40, or 60°C. Interlaminar shear tests and transverse shear tests were conducted at each period (30, 60, 120, and 240 days). The results showed that BFRP bar coated with 6% alkaline content exhibited a slightly higher degradation of shear strength. Furthermore, the prestress developed microcracks in the bars and weakened the interface between the fiber and resin matrix, particular at the elevated temperature. This led to further degradation of the BFRP bars. Additionally, a comparison was made between the shear strength results of BFRP bars coated with SSGM and those coated with ordinary portland concrete or seawater sea‐sand concrete, revealing that the long‐term shear performance of BFRP bars was less negatively impacted by the SSGM coating.Highlights Coupled effects of SSGM coatings and sustained loading on the degradation of BFRP bars are investigated. SSGM provides better protection for BFRP bars than cement‐base concrete. Alkaline content of activator in SSGM has insignificant impact on the BFRP degradation.

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Section: Resultssupporting

confidence: 93%

Section: Effect Of Elevated Temperature and Prestressmentioning

confidence: 99%

Shear performance degradation of basalt fiber‐reinforced polymer bars in seawater environments: Coupled effects of seawater sea‐sand geopolymer mortar coatings and sustained loading

Jiang,

Zhao,

Xie

et al. 2023

Polymer Composites

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show abstract

“…These species can be easily hydrolyzed with the ester bond in the matrix, as shown in Equation ( 1), eventually leading to the fracture of the polymer molecular chain. 29 Simultaneously, water and external ions can further penetrate the matrix through micro-cracks, resulting in matrix plasticization and material stiffness reduction (1) In terms of fiber reinforcement, the surface of FRP composite fibers after seawater aging is prone to defects, such as depression, pitting corrosion, and micro-cracks. The corrosion mechanism varies with the composition of the reinforced fibers, mainly due to the different chemical reactions of the ions involved.…”

Section: Mechanisms Of Seawater Agingmentioning

confidence: 99%

Section: Mechanisms Of Seawater Agingmentioning

confidence: 99%

Seawater aging effect on fiber-reinforced polymer composites: Mechanical properties, aging mechanism, and life prediction

Nan

Zhi

Meng

et al. 2023

Textile Research Journal

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Fiber-reinforced polymer (FRP) composites are widely used in marine engineering fields, such as coastal construction, offshore bridges, submarines, and warships, owing to their light weight, high strength, and corrosion resistance. However, owing to the harsh marine environment, FRP composites used in the ocean are inevitably affected by seawater aging. Therefore, it is necessary to investigate the seawater aging properties of FRP composites. In this study, the seawater aging mechanism of FRP composites is summarized, and the influence factors (matrix type, fiber type, immersion temperature, loading mode, and aging method) of seawater aging on the mechanical properties of FRP composites are further reviewed in detail. Based on this, the method for improving the seawater resistance of FRP composites is summarized. In addition, the research schemes of accelerated aging of FRP composites and commonly used life prediction models are summarized, and the methods and suggestions for improving the accuracy of life prediction are further discussed.

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“…The conclusions confirmed that the degradation degree of basalt‐FRP bar increased successively from distilled water, ordinary concrete to seawater sea‐sand concrete (SWSS) environments. Yi et al [ 34 ] monitored the transverse shear strength of basalt‐FRP bar exposed to different alkalinity environments. The outcomes revealed that the degradation degree apparently decreased when pH value of exposure environment was 12.3, while the strength retention for the samples exposed to a pH = 13.2 environment was 6.17% lower than that of the counterparts exposed to a pH = 10.1 environment.…”

Section: Introductionmentioning

confidence: 99%

Study on durability of transverse shear properties for novel carbon/glass hybrid fiber‐reinforced polymer bars in simulated concrete environments

et al. 2023

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Durability on the transverse shear properties of hybrid fiber-reinforced polymer (HFRP) bar may control the cross-sectional load-bearing capacity and failure mode of the HFRP bar reinforced concrete members due to its strength degradation with time. Herein, the degradation of novel carbon/glass (C/G)-HFRP bars were accelerated in simulated concrete environments at 60 C to investigate the effects of fiber volume fraction and distribution pattern, matrix resin volume fraction, exposure environment, and period on their transverse shear properties. The results displayed that the transverse shear strength of the samples reduced by 15%, 20%, and 8% after exposure to the simulated ordinary concrete, seawater sea-sand concrete environments, and tap water for 6 months, respectively. The inward diffusion of water molecules and free hydroxyl ions caused the hydrolysis of matrix resin, etching of glass fiber and debonding of fiber/matrix interface, which were the incentives of the degradation of C/G-HFRP bars. The increase of matrix resin volume fraction and the application of a waterproof coating were recommended to alleviate the degradation of fibrous composites in concrete environments. Finally, two prediction models were proposed to determine the transverse shear strength of HFRP bar before and after exposure to different harsh environments, respectively. The comparisons indicated that the predicted values were coincided with the experimental results.

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Effect of alkalinity on the shear performance degradation of basalt fiber-reinforced polymer bars in simulated seawater sea sand concrete environment

Cited by 76 publications

References 50 publications

Shear performance degradation of basalt fiber‐reinforced polymer bars in seawater environments: Coupled effects of seawater sea‐sand geopolymer mortar coatings and sustained loading

Shear performance degradation of basalt fiber‐reinforced polymer bars in seawater environments: Coupled effects of seawater sea‐sand geopolymer mortar coatings and sustained loading

Seawater aging effect on fiber-reinforced polymer composites: Mechanical properties, aging mechanism, and life prediction

Study on durability of transverse shear properties for novel carbon/glass hybrid fiber‐reinforced polymer bars in simulated concrete environments

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