Emprego de resina epóxi em vigas danificadas de madeira de Pinus elliottii

Bertolini, Marília da Siva; Almeida, Diego Henrique de; Macedo, Laurenn Borges de; Icimoto, Felipe Hideyoshi; Ferro, Fabiane Salles; Christofóro, André Luis; Lahr, Francisco Antônio Rocco

doi:10.1590/s1678-86212014000300010

Cited by 4 publications

(2 citation statements)

References 12 publications

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“…An alternative to repair (recovery of the original load capacity of the undamaged element) or reinforce (increase of the original load capacity of the undamaged element) wood structures, among other materials, consist on the use of composite materials (Bertolini et al 2014, Miotto and Dias 2015, Carvalho et al 2016, Fernando et al 2016, laminates of carbon fibers Dias 2003, Garcia et al, 2013), because they have elevated mechanical strength and can contribute significantly in tensioned regions of structural elements of wood subject in bending, elevating its tensile strength and stiffness, since bending failure begins by tension. (Franke et al 2015, Grazide et al 2015.…”

Section: Introductionmentioning

confidence: 99%

Carbon fiber-reinforced polymers as a tensile reinforcement of the Pinus elliotti and Manilkara huberi wood species

Bravo

Branco

Chahud

et al. 2020

Maderas, Cienc. tecnol.

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In wood structures, the elements subjected to bending stresses, such as the beams, present a fracture initiated in the tensile region, and under these conditions, the use of laminated composite materials is presented as an alternative solution in the form of repair or reinforcement. This research aimed to evaluate the influence of the use of carbon fibers laminated composites in tensile reinforcement in the direction parallel to grain of Pinus elliotti and Manilkara huberi wood species. The Viapol two-component epoxy adhesive was used in the lamination and fixation of the unidirectional carbon fiber in the wood species. Ten specimens with no defects (reference) and 10 specimens were prepared for each crack length (25 and 50mm) with and without the reinforcement (60mm × 50mm) by the laminated composite. The tensile tests were performed in accordance with the requirements of the Brazilian standard ABNT NBR 7190 (1997). From the results of the statistical analysis, the use of the carbon fiber composite was able to restore the tensile strength of the cracked samples (partial or total) in relation to samples without defects, demonstrating the potential of the laminates in carbon fibers as an alternative solution in repair for both wood species.

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Section: Introductionmentioning

confidence: 99%

Carbon fiber-reinforced polymers as a tensile reinforcement of the Pinus elliotti and Manilkara huberi wood species

Bravo

Branco

Chahud

et al. 2020

Maderas, Cienc. tecnol.

Self Cite

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“…This material is able to fill surface chips (attacked by insects) and voids, also increasing the load capacity of the structure. Bertolini et al (2014) have used epoxy polymer to repair wood beams of P. elliottii with the insertion of cavities to simulate natural defects. The beams have been tested under three-point static bending tests.…”

Section: Introductionmentioning

confidence: 99%

Epoxy mortar timber beam upgrading

Carvalho

Panzera

Christofóro

et al. 2017

International Wood Products Journal

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The physical and mechanical properties of brown-pigmented particulate composites based on epoxy polymer reinforced with quartz particles were assessed experimentally. The best setup condition was chosen to repair Maçaranduba and Cedrinho timber species. A full factorial design was conducted to evaluate the effect of the quartz particle (0, 40, 50, 60 wt-%) and pigment (0, 0.02 wt-%) inclusions on the density, apparent porosity, compressive modulus and strength. The composite made with 50 wt-% of quartz particles and 0.02 wt-% of pigment revealed promising characteristics for restoration works, being used to repair the upper (under compression) side of timber beams evaluated under four-point bending tests. The timber beams were evaluated in pristine, with defect and in repaired conditions. Repaired Cedrinho timber achieved similar mechanical behaviour when compared with pristine conditions. In contrast, the repair procedure was not successful in restoring the load capacity of damaged Maçaranduba timber beams.

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Influence of temperature on the adhesion of fibre reinforced polymers to timber surface

et al. 2019

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Carbon and glass fibre reinforced polymer composites are being increasingly used in timber structures, where they can be exposed to harsh temperature conditions. In order to be properly used, information is needed on their adhesion to the substrate. The objective of this research is to evaluate the influence of temperatures between 20 and 80 ºC on the adhesion of these reinforcements to the wood. The shear test of adhesive line and pull-off test of the reinforcement from wood surface were carried out using specimens made of Pinus spp. The results demonstrated that temperature causes the nonlinear reduction of the reinforcement adhesion. The specimens exposed to a temperature of 80 °C presented residual bond strength means of 34% and 20% of the mean strength at room temperature for CFRP and for GFRP, respectively. Caution in using the applied resins is required due to the presented behaviour even in the service temperature range specified by the manufacturers.

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Emprego de resina epóxi em vigas danificadas de madeira de Pinus elliottii

Cited by 4 publications

References 12 publications

Carbon fiber-reinforced polymers as a tensile reinforcement of the Pinus elliotti and Manilkara huberi wood species

Carbon fiber-reinforced polymers as a tensile reinforcement of the Pinus elliotti and Manilkara huberi wood species

Epoxy mortar timber beam upgrading

Influence of temperature on the adhesion of fibre reinforced polymers to timber surface

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