Fabrication and structural evaluation of fibre reinforced bamboo composite beams as green structural elements

Bhagat, D. J.; Bhalla, Suresh; West, Roger

doi:10.1016/j.jcomc.2021.100150

Cited by 8 publications

(6 citation statements)

References 5 publications

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“…Fibras com densidades mais elevadas resultam em compósitos com melhores propriedades mecânicas, já que apresentam mais massa lignocelulósica para resistir as solicitações externas que o material está submetido [28]. Porém, a baixa densidade do bambu resulta em uma relação resistência/peso maior em comparação ao aço e ao concreto [29]. Já a umidade na base seca obtida foi de 4,178%, superior ao encontrado por MORAIS et al [24] para a espécie de bambu Bambusa tuldoides que variou de 2,23 a 2,86%, porém da mesma forma que a densidade, a umidade pode sofrer variações até mesmo dentro da mesma espécie.…”

Section: Propriedades Físicas Valorunclassified

Avaliação física e mecânica de compósitos de gesso reforçados com fibra de Bambusa tuldoides

et al. 2022

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RESUMO Essa pesquisa objetivou avaliar o potencial do bambu Bambusa tuldoides como reforço na matriz de gesso. Foi determinada a densidade básica, dimensões de fibras e constituição química da matéria-prima. Foram produzidos compósitos com substituição em volume da pasta de gesso por 0, 5, 10, 15, 20, 25 e 30% de bambu com uma relação água/gesso de 1:1. Para a caracterização mecânica dos compósitos foram realizados ensaios de flexão estática, compressão e densidade aparente. Os valores obtidos na avaliação da fibra apresentaram valores próximos à literatura. Na caracterização dos compósitos todas as propriedades tiveram regressão quadrática significativa e foi possível verificar o comportamento similar entre propriedades mecânicas e a densidade. Na densidade ocorreu um aumento do seu valor até a porcentagem de 17,41% que pode ser justificado devido à absorção da água pela fibra decorrente da presença de pontuações, o que gera uma diminuição na relação água gesso e um aumento da densidade. Já o decréscimo da densidade a partir de 17,41% está relacionado com a grande quantidade de fibras presente que ficam emaranhadas e causam espaços vazios já que a pasta de gesso não consegue infiltrar nesses locais. Na compressão, as porcentagens entre 3,37 e 26,19% são os que atenderam as exigências normativas (maior que 2 MPa), e na flexão as porcentagens entre 0 e 27,23% são as que estão em conformidade com a norma (maior que 1 MPa). Os resultados mostraram que a utilização do bambu Bambusa tuldoides como reforço é viável entre as porcentagens 3,37 e 26,19% para atender todas as exigências normativas.

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Section: Propriedades Físicas Valorunclassified

Avaliação física e mecânica de compósitos de gesso reforçados com fibra de Bambusa tuldoides

et al. 2022

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“…[23][24][25][26] BFs' natural flexibility increases the composite materials' toughness and impact resistance, reducing the risk of brittle fracture and boosting overall durability. [27][28][29][30] It can be combined with other natural fibers for making hybrid composites and green structural parts 31 like combining with, kenaf, 12 hemp, flax, jute, coir, 6 pineapple, groundnut shell, 17 etc. Caustic soda is used to alkali treat chicken feathers with carbon residuum (CR) reinforced in epoxy after Mechanical testing and SEM and XRD analysis forecasted best results for 5 wt% chicken feather and 1 wt% of CR hybrid composites.…”

Section: Introductionmentioning

confidence: 99%

Eco‐friendly recycled glass fiber and bamboo fiber reinforced epoxy‐SiO₂ polymer hybrid composite: Development and mechanical characterization

Ahirwar,

Purohit,

Dixit

2024

Polymer Composites

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In the pursuit of sustainable and high‐performance materials, this study presents a groundbreaking approach to enhance the mechanical properties of glass fiber‐reinforced polymer composites. Railway waste provides an unexpected source of recycled glass fibers (RGFs), which, when combined with bamboo fibers (BFs) and nano SiO2 in a resilient epoxy matrix, unleashes a transformative synergy. The epoxy‐SiO2 matrix ratio was kept constant, that is,70% by weight while varying the ratio of RGF and BFs weight. The experimental results demonstrated notable improvements in mechanical properties. Specifically, a 36.92% increase in tensile strength was observed with an RGF and BF ratio of 20:10. Flexural strength exhibited a substantial enhancement of 44.67%, and impact strength increased by 31.28% at a ratio of 15:15. The composite achieved a remarkable 42.64% improvement in hardness, while attaining the lowest density value of 0.862 at a ratio of 25:05.Water absorption tests, conducted in both distilled and saline water, provided insights into the material's resistance to environmental conditions. The morphological and dispersion behaviors of the prepared composites were analyzed using advanced characterization techniques, including field‐emission scanning electron microscopy (FE‐SEM) to study the orientation, shape, and size of fibers and particles, bonding between the fibers and matrix, defects, voids, etc. Combined with energy dispersive x‐ray spectroscopy (EDX), FESEM allows for elemental analysis, helping to identify and quantify the chemical composition of different phases within the polymer composite. X‐ray diffraction (XRD) analysis to know the compositions of developed composites. The findings from this study underscore the efficacy of incorporating recycled materials.Highlights Extraction and reusing GF to develop a new hybrid composite. BF and RGF in epoxy‐SiO2 matrix present high mechanical property composite. Density and water absorption tests were done to see the swelling properties. Characterization technique employed to see the interphase of composites developed.

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“…Bamboo, being a renewable resource, has garnered significant attention in low-carbon economies due to its notable attributes such as rapid growth, effective carbon sequestration, favorable physical characteristics and commendable mechanical properties [1][2][3][4][5][6]. The energy consumption ratio for the same construction is 1:8:50 for bamboo, concrete, and steel, respectively [7].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Flexural Behavior of I-Shaped Laminated Bamboo Composite Beam as Sustainable Structural Element

Li,

Singh,

Zhou

2024

Buildings

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Laminated bamboo (LB) is considered a promising environmentally friendly material due to its notable strength and advantageous lightweight properties, making it suitable for use in construction applications. LB I-beams are a prevalent component in bamboo structures due to their ability to fully utilize their material properties and enhance efficiency when compared to beams with rectangular solid sections, while the characteristics of connections should be further studied. This paper presents an experimental investigation of the flexural behavior of I-shaped LB beams that are connected using self-tapping screws and LB dowels. Compared with glued beams of the same size, the findings of the study reveal that the primary failure modes observed in those two types of components were characterized by the separation of the component and web tensile fracture. The screw beam and dowel beam exhibited a reduced ultimate capacity of 43.54% and 30.03%, respectively, compared to the glued beam. Additionally, the ultimate deflections of the screw beam and dowel beam were 34.38% and 50.36% larger than those of the glued beam, respectively. These variations in performance can be attributed to the early breakdown of connectors. Based on design codes, it can be observed that the serviceability limits were in close proximity, whereas the ultimate strains of the top and bottom flanges were significantly lower than the ultimate stresses experienced under uniaxial loading conditions. As a result of the slip and early failure of connectors, the effective bending stiffness estimated by the Gamma method achieved better agreements before elastic proportional limit. Therefore, in future investigations, it would be beneficial to enhance the connector and fortify the flange as a means of enhancing the bending characteristics of an I-shaped beam.

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Fabrication and structural evaluation of fibre reinforced bamboo composite beams as green structural elements

Cited by 8 publications

References 5 publications

Avaliação física e mecânica de compósitos de gesso reforçados com fibra de Bambusa tuldoides

Avaliação física e mecânica de compósitos de gesso reforçados com fibra de Bambusa tuldoides

Eco‐friendly recycled glass fiber and bamboo fiber reinforced epoxy‐SiO₂ polymer hybrid composite: Development and mechanical characterization

Experimental Study on the Flexural Behavior of I-Shaped Laminated Bamboo Composite Beam as Sustainable Structural Element

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Fabrication and structural evaluation of fibre reinforced bamboo composite beams as green structural elements

Cited by 8 publications

References 5 publications

Avaliação física e mecânica de compósitos de gesso reforçados com fibra de Bambusa tuldoides

Avaliação física e mecânica de compósitos de gesso reforçados com fibra de Bambusa tuldoides

Eco‐friendly recycled glass fiber and bamboo fiber reinforced epoxy‐SiO2 polymer hybrid composite: Development and mechanical characterization

Experimental Study on the Flexural Behavior of I-Shaped Laminated Bamboo Composite Beam as Sustainable Structural Element

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Eco‐friendly recycled glass fiber and bamboo fiber reinforced epoxy‐SiO₂ polymer hybrid composite: Development and mechanical characterization