Mechanical Properties of Hybrid FRP Bars and Nano-Hybrid FRP Bars

Szmigiera, Elżbieta; Protchenko, Kostiantyn; Urbański, Marek; Garbacz, Andrzej

doi:10.2478/ace-2019-0007

Cited by 23 publications

(21 citation statements)

References 25 publications

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“…The results for different fibers arrangement and different volume fractions of fibers are described in Table 1. The comparison between analytical considerations and numerical simulations of FRP bars was explained in more detail in [8]. The results showed that bar configuration is less important than the volume fraction of fibers.…”

Section: The Concept Of Hybrid Frp Barsmentioning

confidence: 99%

“…HFRP bars contain several types of reinforcing constituents and/or several types of adhesive constituents in a matrix. Moreover, some authors suggest that such hybridization of the constituents of FRP bars can prevent changes in their behavior, making it semi-ductile instead of linear [8,9]. Therefore, their use in the form of FRP bars as a replacement of conventional reinforcement for reinforced concrete (RC) structures has become attractive.…”

Section: Introductionmentioning

confidence: 99%

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Post-Fire Characteristics of Concrete Beams Reinforced with Hybrid FRP Bars

Protchenko

Szmigiera

2020

Materials

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One of the main concerns of experimental and numerical investigations regarding the behavior of fiber-reinforced polymer reinforced concrete (FRP-RC) members is their fire resistance to elevated temperatures and structural performance at and after fire exposure. However, the data currently available on the behavior of fiber-reinforced polymer (FRP) reinforced members related to elevated temperatures are scarce, specifically relating to the strength capacity of beams after being subjected to elevated temperatures. This paper investigates the residual strength capacity of beams strengthened internally with various (FRP) reinforcement types after being subjected to high temperatures, reflecting the conditions of a fire. The testing was made for concrete beams reinforced with three different types of FRP bars: (i) basalt-FRP (BFRP), (ii) hybrid FRP with carbon and basalt fibers (HFRP) and (iii) nano-hybrid FRP (nHFRP), with modification of the epoxy matrix of the rebar. Tested beams were first loaded at 50% of their ultimate strength capacity, then unloaded before being heated in a furnace and allowed to cool, and finally reloaded flexurally until failure. The results show an atypical behavior observed for HFRP bars and nHFRP bars reinforced beams, where after a certain temperature threshold the deflection began to decrease. The authors suggest that this phenomenon is connected with the thermal expansion coefficient of the carbon fibers present in HFRP and nHFRP bars and therefore creep can appear in those fibers, which causes an effect of “prestressing” of the beams.

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Section: The Concept Of Hybrid Frp Barsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Post-Fire Characteristics of Concrete Beams Reinforced with Hybrid FRP Bars

Protchenko

Szmigiera

2020

Materials

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“…Based on the Rule of Mixtures (ROM) equation, Young's modulus and other parameters were determined for the Hybrid Carbon/Basalt FRP (HC/BFRP) and for different combinations depending on carbon to basalt fiber volume fractions. Different levels of fibers substitution (carbon-to-basalt C/B) were proposed: 1:1, 1:2, 1:3, 1:4, and 1:9, which is represented in Figure 1 [36]. The Voigt model does not consider the location of the fibers; therefore, numerical analysis was made for two configurations: (i) carbon fibers in the core region and basalt fibers in the near-surface region, (ii) carbon fibers in the near-surface region and basalt fibers in the core region of the bar section.…”

Section: The Concept Of Hybrid Frp Barsmentioning

confidence: 99%

“…Numerical results indicated that the arrangement of the fibers was not of high importance for the final mechanical properties of HFRP bars with different combinations of fibers. More on the analytical and numerical investigation of Hybrid FRP bars can be found in companion papers [36,37]. Two different HFRP bars' configurations were produced by the manufacturing company.…”

Section: The Concept Of Hybrid Frp Barsmentioning

confidence: 99%

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Tensile and Shear Testing of Basalt Fiber Reinforced Polymer (BFRP) and Hybrid Basalt/Carbon Fiber Reinforced Polymer (HFRP) Bars

et al. 2020

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The use of sustainable materials is a challenging issue for the construction industry; thus, Fiber Reinforced Polymers (FRP) is of interest to civil and structural engineers for their lightweight and high-strength properties. The paper describes the results of tensile and shear strength testing of Basalt FRP (BFRP) and Hybrid FRP (HFRP) bars. The combination of carbon fibers and basalt fibers leads to a more cost-efficient alternative to Carbon FRP (CFRP) and a more sustainable alternative to BFRP. The bars were subjected to both tensile and shear strength testing in order to investigate their structural behavior and find a correlation between the results. The results of the tests done on BFRP and HFRP bars showed that the mechanical properties of BFRP bars were lower than for HFRP bars. The maximum tensile strength obtained for a BFRP bar with a diameter of 10 mm was equal to approximately 1150 MPa, whereas for HFRP bars with a diameter of 8 mm, it was higher, approximately 1280 MPa. Additionally, better results were obtained for HFRP bars during shear testing; the average maximum shear stress was equal to 214 MPa, which was approximately 22% higher than the average maximum shear stress obtained for BFRP bars. However, HFRP bars exhibited the lowest shear strain of 57% that of BFRP bars. This confirms the effectiveness of using HFRP bars as a replacement for less rigid BFRP bars. It is worth mentioning that after obtaining these results, shear testing can be performed instead of tensile testing for future studies, which is less complicated and takes less time to prepare than tensile testing.

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