Long-term moisture absorption and durability of FRP pultruded rebars

Starkova, Olesja; Анискевич, К.; Sevcenko, Jevgenijs

doi:10.1016/j.matpr.2019.12.154

Cited by 19 publications

(19 citation statements)

References 20 publications

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“…Outside elements are also less protected from fire, and FRP is sensitive to high temperatures. Although internal reinforcement can also have problems with durability, fire and bond, outside reinforcement is more sensitive to those problems [2].…”

Section: Methods Of Increasing the Ductility Of Concrete Elementsmentioning

confidence: 99%

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Ductility of Concrete Beams Reinforced with FRP Rebars

Renić

Kišiček

2021

Buildings

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Concrete beams reinforced with FRP rebars have greater durability than standard steel reinforced elements. The main disadvantage of using FRP rebars is the low ductility of elements which may be unacceptable in certain situations. There are several different ways of increasing the ductility of concrete elements, which are analyzed in this paper. They are compared based on efficiency, influence on durability and ease of construction. Less analyzed and tested methods are given more attention to try and expand the current knowledge and possibilities. For methods that lack experimental data, theoretical analysis is undertaken to assess the possible influence of that method on the increase in ductility. Ductility was obtained by calculating bending moment–curvature diagrams of cross sections for different reinforcement layouts. One method that lacks experimental data is confining the compressive area of beams with tensile FRP reinforcement. Theoretical analysis showed that confining the compressive area of concrete can significantly increase the ductility and bending capacity of beams. Since experimental data of beams reinforced with FRP rebars in tension and confined compressive area is sparse, some suggestions on the possible test setups are given to validate this theoretical analysis. Concrete beams reinforced with FRP can be detailed in such a way that they have sufficient ductility, but additional experimental research is needed.

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Section: Methods Of Increasing the Ductility Of Concrete Elementsmentioning

confidence: 99%

“…Although FRP does not corrode in the same manner as steel, prolonged water exposure, high temperatures and high long term stress can cause durability issues [2][3][4]. An alkali concrete environment can also cause durability issues for some types of fiber, but rebars are usually made of alkali resistant materials.…”

Section: Introductionmentioning

confidence: 99%

Ductility of Concrete Beams Reinforced with FRP Rebars

Renić

Kišiček

2021

Buildings

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“…Analytical solutions to Fick’s 2nd law for anisotropic materials can be found in work by Crank in [ 64 ]. Relations for calculating water contents w ( t ) are obtained by integration over the sample volume; these could be found elsewhere for orthotropic composite plates [ 57 , 65 ], rods [ 57 , 66 ], and pipes [ 57 ].…”

Section: Ageing and Degradation Modelling Of Composite Microconstituentsmentioning

confidence: 99%

Modelling of Environmental Ageing of Polymers and Polymer Composites—Modular and Multiscale Methods

et al. 2022

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Service lifetimes of polymers and polymer composites are impacted by environmental ageing. The validation of new composites and their environmental durability involves costly testing programs, thus calling for more affordable and safe alternatives, and modelling is seen as such an alternative. The state-of-the-art models are systematized in this work. The review offers a comprehensive overview of the modular and multiscale modelling approaches. These approaches provide means to predict the environmental ageing and degradation of polymers and polymer composites. Furthermore, the systematization of methods and models presented herein leads to a deeper and reliable understanding of the physical and chemical principles of environmental ageing. As a result, it provides better confidence in the modelling methods for predicting the environmental durability of polymeric materials and fibre-reinforced composites.

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“…Basalt fibre reinforced composites (BFRCs) are sustainable materials that can be positioned between glass fibre reinforced composites (GFRCs) and carbon fibre reinforced composites (CFRCs) in terms of performance and cost-effectiveness. Besides, BFRCs also have high stability to the action of water, acids, and chemically active media which results in prolonged durability of FRPs during operation in the outdoor environments in comparison with CFRCs and GFRCs [ 1 , 3 , 4 ]. Based on these advantages, the applicability of BFRCs as structural materials for outdoor applications is highly expected [ 5 , 6 ].…”

Section: Introductionmentioning

confidence: 99%

Basalt Fibre Composite with Carbon Nanomodified Epoxy Matrix under Hydrothermal Ageing

et al. 2021

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This work aimed to investigate the effect of hybrid carbon nanofillers (e.g., carbon nanotubes/carbon nanofibers in the ratio 1:1 by mass) over the electrical and flexural properties for an epoxy matrix and corresponding basalt fibre reinforcing composite (BFRC) subjected to full-year seasonal water absorption. Hydrothermal ageing was performed by full immersion of the tested materials into distilled water according to the following model conditions (seasons). The mechanical properties were measured in three-point bending mode before environmental ageing and after each season. Upon environmental ageing, the relative change of flexural strength and elastic modulus of the epoxy and NC was within 10–15%. For nanomodified BFRCs, the slightly higher effect (approx. by 10%) of absorbed moisture on flexural characteristics was found and likely attributed to higher defectiveness (e.g., porosity, the formation of agglomerates etc.). During flexural tests, electrical resistance of the nanocomposites (NC) and BFRC/NC samples was evaluated. The electrical conductivity for UD BFRC/NC, before and after hydrothermal ageing, was by 2 and 3 times higher than for the NC, accordingly, revealing the orientation of electrically conductive nanoparticles and/or their agglomerates during lay-up manufacturing which was evaluated by the rules of the mixture. Based on all results obtained it can be concluded that the most potentially applicable for damage indication was UD BFRC/NC along fibres since full-year hydrothermal ageing improved its electrical conductivity by approx. 98% and, consequently, the ability to monitor damages was also enhanced.

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Long-term moisture absorption and durability of FRP pultruded rebars

Cited by 19 publications

References 20 publications

Ductility of Concrete Beams Reinforced with FRP Rebars

Ductility of Concrete Beams Reinforced with FRP Rebars

Modelling of Environmental Ageing of Polymers and Polymer Composites—Modular and Multiscale Methods

Basalt Fibre Composite with Carbon Nanomodified Epoxy Matrix under Hydrothermal Ageing

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