Thermophysical and thermomechanical properties of basalt-phenolic FRP rebars under high temperature

Li, Ting; Zhu, Hong; Shen, Jiahui; Keller, Thomas

doi:10.1016/j.conbuildmat.2022.127983

Cited by 13 publications

(4 citation statements)

References 36 publications

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“…Exploration into the mechanical properties of FRP at elevated temperatures stands as a pivotal focus within FRP material research. This exploration encompasses three primary directions: the mechanical behavior of FRP at high temperatures [6,[10][11][12][13][14], the bond strength of FRP reinforcement and concrete under high temperatures [15][16][17][18][19][20], and the effects of high temperatures on FRP reinforcing and restraining components [21][22][23][24][25]. Numerous researchers have delved into this subject, utilizing experimental, numerical, and analytical approaches.…”

Section: Introductionmentioning

confidence: 99%

Modified Constitutive Models and Mechanical Properties of GFRP after High-Temperature Cooling

Wu,

Zhang

2024

Buildings

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Many materials are highly sensitive to temperature, and the study of the fire resistance of materials is one of the important research directions, which includes the study of the fire resistance of fiber-reinforced polymer (FRP) composites, but the cooling mode on the change of FRP mechanical properties after high temperature has not been investigated. This study analyzes the mechanical properties of GFRP under various cooling methods after exposure to high temperatures. The tensile strength of GFRP was evaluated through water cooling, firefighting foam cooling, and air cooling within the temperature range of 20–300 °C. Damage modes were investigated at different target temperatures. The results indicate that the tensile strength of air-cooled GFRP is the highest, whereas water cooling yields the lowest retention rate. It indicates that the FRP temperature decreases slowly under air cooling and the better recovery of the damage within the resin matrix, while under water cooling, the damage at the fiber/resin interface is exacerbated because of the high exposed temperature and the water, resulting in a reduction in the strength of GFRP. Between 20 and 150 °C, GFRP essentially recovers its mechanical properties after cooling, with a residual tensile strength factor exceeding 0.9. In the range of 150–250 °C, GFRP exhibits a graded decline in strength. At 300 °C, GFRP loses certain mechanical properties after cooling, with a residual tensile strength factor below 0.1. Furthermore, the analysis of experimental results led to the modification of the Johnson–Cook constitutive model, proposing a model for GFRP under three cooling methods. Additionally, a predictive model for the elastic modulus of GFRP after high-temperature cooling was derived, showing agreement with experimental results.

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Section: Introductionmentioning

confidence: 99%

Modified Constitutive Models and Mechanical Properties of GFRP after High-Temperature Cooling

Wu,

Zhang

2024

Buildings

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“…[1][2][3] The lighter weight of building structures reduces the load on the foundation of the structure, which allows to extend its service life. [2][3][4] Composite reinforcement, unlike its metal counterparts, better tolerates tensile loads, which makes it possible to use it to strengthen the most critical concrete structures. [1][2][3][4][5][6][7][8][9] As a binder in the production of composite reinforcement by pultrusion from continuous glass or basalt fiber, hot curing epoxy resins are used, the properties of which largely depend on the chemical structure of the epoxy resin, hardener and reaction accelerator.…”

Section: Introductionmentioning

confidence: 99%

“…[2][3][4] Composite reinforcement, unlike its metal counterparts, better tolerates tensile loads, which makes it possible to use it to strengthen the most critical concrete structures. [1][2][3][4][5][6][7][8][9] As a binder in the production of composite reinforcement by pultrusion from continuous glass or basalt fiber, hot curing epoxy resins are used, the properties of which largely depend on the chemical structure of the epoxy resin, hardener and reaction accelerator. [10][11][12] In particular, the curing modes, mechanical properties and chemical resistance of the binder strongly depend on the nature of the hardener.…”

Section: Introductionmentioning

confidence: 99%

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Alkali resistant epoxy binders for pultrusion

Leshtaev,

Storozhuk,

Orlov

et al. 2023

E3S Web of Conf.

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Alkali-resistant hot-curing epoxy binders based on ED-20 and new amine hardeners “Amikrost” have been developed, intended for the production of glass-composite fittings for construction purposes. The rheological properties of epoxy compositions were determined, using differential scanning calorimetry and thermogravimetric analysis, the temperature dynamics of the curing process of epoxy compositions and the thermal-oxidative resistance of cured samples were studied. The alkali resistance of cured epoxy compositions and specimens of composite reinforcement in 40% alkali aqueous solution was evaluated. It is shown that the developed amine hardeners provide high alkali resistance of composite reinforcement in comparison with the currently used anhydride hardener iso-MTHPA, which is especially important for reinforcing buried and hydraulic concrete.

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