Residual Tensile Strength and Bond Properties of GFRP Bars after Exposure to Elevated Temperatures

Ellis, Devon S; Tabatabai, Habib; Nabizadeh, Azam

doi:10.3390/ma11030346

Cited by 58 publications

(30 citation statements)

References 25 publications

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“…When the exposure temperature exceeded 300 °C, the ultimate tensile strength of GFRP bars was about 46% lower than that at room temperature (25 °C). The test results of Devon et al [ 21 ] indicated that the residual tensile strength of GFRP bars at 400 °C was 83% of that at room temperature, which is highly different from Reference [ 20 ] with the decrease of 46% of the tensile strength of GFRP bars at 300 °C. Similarly, Wang et al [ 22 ] found that the ultimate tensile strength of GFRP bars was reduced by a maximum of 6% at less than 80 °C, and by 22% at 80–120 °C.…”

Section: Introductionmentioning

confidence: 90%

“…When the temperature reached 350 °C, the tensile properties of both FRP bars were drastically reduced and the bearing capacity was almost lost. Therefore, due to different factors such as production process and level, resin types, fiber types, heating curve, and period of heating, the properties of FRP bars showed different degrees of deterioration after elevated temperatures [ 21 , 22 , 25 , 26 ].…”

Section: Introductionmentioning

confidence: 99%

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Fatigue Behavior of Glass Fiber-Reinforced Polymer Bars after Elevated Temperatures Exposure

Zhao

Wang

2018

Materials

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Fiber-reinforced polymer (FRP) bars have been widely applied in civil engineering. This paper presents the results of an experimental study to investigate the tensile fatigue mechanical properties of glass fiber-reinforced polymer (GFRP) bars after elevated temperatures exposure. For this purpose, a total of 105 GFRP bars were conducted for testing. The specimens were exposed to heating regimes of 100, 150, 200, 250, 300 and 350 °C for a period of 0, 1 or 2 h. The GFRP bars were tested with different times of cyclic load after elevated temperatures exposure. The results show that the tensile strength and elastic modulus of GFRP bars decrease with the increase of elevated temperature and holding time, and the tensile strength of GFRP bars decreases obviously by 19.5% when the temperature reaches 250 °C. Within the test temperature range, the tensile strength of GFRP bars decreases at most by 28.0%. The cyclic load accelerates the degradation of GFRP bars after elevated temperature exposure. The coupling of elevated temperature and holding time enhance the degradation effect of cyclic load on GFRP bars. The tensile strength of GFRP bars after elevated temperatures exposure at 350 °C under cyclic load is reduced by 50.5% compared with that at room temperature and by 36.3% compared with that after exposing at 350 °C without cyclic load. In addition, the elastic modulus of GFRP bars after elevated temperatures exposure at 350 °C under cyclic load is reduced by 17.6% compared with that at room temperature and by 6.0% compared with that after exposing at 350 °C without cyclic load.

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Section: Introductionmentioning

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Fatigue Behavior of Glass Fiber-Reinforced Polymer Bars after Elevated Temperatures Exposure

Zhao

Wang

2018

Materials

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“…This is similar to the temperature ranges applied in the studies by Cao et al [33] and Chowdhury et al [34]. Meanwhile, the exposure time is determined based on the studies by Bazli et al [12], Li et al [14], and Ellis et al [16]. After heating for two hours, the test specimens were naturally cooled down prior to direct tensile test.…”

Section: Experimental Programmentioning

confidence: 95%

“…Many studies have been experimentally carried out to investigate the effect of high temperature on the mechanical performances of FRP composites [13][14][15][16][17][18][19][20][21]. Obviously, the mechanical properties of the FRP composites could be characterized by tensile, compressive, flexural impact, and interlaminar shear strength (ILSS) performances.…”

Section: Introductionmentioning

confidence: 99%

Tensile Behavior of Carbon Fiber-Reinforced Polymer Composites Incorporating Nanomaterials after Exposure to Elevated Temperature

Truong

Tran

Choi

2019

Journal of Nanomaterials

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This study experimentally examined the effect of nanomaterial on the tensile behavior of carbon fiber-reinforced polymer (CFRP) composites. Multiwalled carbon nanotubes (MWCNT), graphene nanoplatelets (GnPs), and short multiwalled carbon nanotubes functionalized COOH (S-MWCNT-COOH) with 1% by weight were used as the primary test parameters. In the present test, S-MWCNT-COOH was more effective than the others in improving the maximum tensile strength, ultimate strain, and toughness of the CFRP composites. The use of S-MWCNT-COOH increased the maximum tensile strength, ultimate strain, and toughness of the CFRP composites by 20.7, 45.7, and 73.8%, respectively. In addition, tensile tests were carried out for CFRP composites with S-MWCNT-COOH after subjection to elevated temperatures ranging from 50 to 200°C. The test results showed that the tensile strength, ultimate strain, and toughness were significantly reduced with increasing temperature. At a temperature level of 100°C, the reduction of the maximum tensile strength, ultimate strain, and toughness was 36.5, 37.1, and 60.0%, respectively. However, for the specimens subjected to the elevated temperatures ranging from 100 to 200°C, the tensile behavioral properties were constantly maintained. Finally, various analytical models were applied to predict the tensile strength of the CFRP composites with S-MWCNT-COOH. By using the calibrated parameters, the tensile strengths predicted by the models showed good agreement with the experimental results.

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“…Soil nails are in contact with the surrounding soil through the mortar along the length direction, and the strength and stiffness of the undisturbed soil are improved via the bonding frictional resistance on the contact surface. Glass fiber reinforced polymer (GFRP) is lightweight as well as easily designed and processed and has high strength, fatigue resistance, and corrosion resistance, thereby representing a reasonable alternative to steel reinforcements [1][2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Effect of Mortar Constraint Conditions on Pullout Behavior of GFRP Soil Nails

Chen

Que

Zheng

et al. 2020

Advances in Materials Science and Engineering

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Glass fiber reinforced polymer (GFRP) bars are safe, light, and environmentally friendly and, hence, have emerged as desirable alternatives to traditional steel reinforcements in soil nailing wall reinforcement. The loads experienced by GFRP soil nails are transmitted through bonding with mortar and the surrounding soil mass. Constraints of the soil mass on mortar affect the pullout performance of the nails. This paper presents a laboratory test study on the influence of different mortar constraint conditions on the pullout behavior of GFRP soil nails. The results indicated that single loading or cyclic loading has a negligible effect on the failure modes of specimens under different constraints. Therefore, all specimens underwent the same mode of failure, i.e., splitting failure of the mortar. The ultimate pullout force associated with single loading under strong constraint conditions was 77% higher than that under unconstrained conditions, and the anchorage depth increased from 0.6 m to 1.0 m. The load-slip curves obtained for unconstrained conditions and strong constraint conditions were approximately straight lines and double broken lines, respectively. The ultimate tensile stress of GFRP soil nails exceeds the tensile strength of ordinary steel bars, indicating that these nails have sufficient strength reserve.

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Residual Tensile Strength and Bond Properties of GFRP Bars after Exposure to Elevated Temperatures

Cited by 58 publications

References 25 publications

Fatigue Behavior of Glass Fiber-Reinforced Polymer Bars after Elevated Temperatures Exposure

Fatigue Behavior of Glass Fiber-Reinforced Polymer Bars after Elevated Temperatures Exposure

Tensile Behavior of Carbon Fiber-Reinforced Polymer Composites Incorporating Nanomaterials after Exposure to Elevated Temperature

Effect of Mortar Constraint Conditions on Pullout Behavior of GFRP Soil Nails

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