Painéis de partículas com maravalha de Pinus spp. e fibra de sisal

Cabral, Matheus Roberto; Fiorelli, Juliano; Cravo, Julio Cesar Machado; Savastano, Holmer

doi:10.18671/scifor.v45n114.11

“…Para a produção de painéis do gênero Pinus, Silva et al (2021) estudaram a utilização da maravalha de Pinus elliot e de Pinus taeda na forma integral, confeccionando painéis de média e alta densidade e utilizando três tipos de resinas diferentes: quatro misturas com dois tipos de poliuretanas e duas misturas com ureia formaldeído, utilizando como parâmetros de produção umidade em torno de 12% e 15% de adesivo em relação à massa seca, pressão de 3,5 MPa por 10 min e aglutinados com poliuretano derivado do óleo de mamona (PUR) à temperatura de prensagem de 100 ºC e 120 ºC para ureia formaldeído (UF). Cabral et al (2017) realizaram estudo utilizando maravalha de Pinus ssp. e fibra de sisal, confeccionando painéis de baixa densidade, nas proporções de 25%, 50% e 75% na relação Pinus/sisal.…”

Section: Referencial Teóricounclassified

“…Mesmo com os resultados diminuídos, estes ainda são altos se comparados com os encontrados por Silva et al (2021) e Cabral et al (2017), que também usaram PUR, conforme mostra a Tabela 6. O primeiro tratamento obteve resultados melhores aos encontrados no trabalho de Iwakiri et al (2010), que utilizou as variedades bahamensis e cariabea, sendo os valores de I24h para as espécies de 25,35% e 31,34% respectivamente.…”

Section: Propriedades Físicasunclassified

Painéis aglomerados com resíduo de Pinus caribaea var. caribaea com adesivo bicomponente sustentável

Souza

¹

,

Silva

²

,

Cazella

³

et al. 2023

Ambient. constr.

1

0

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Resumo Esta pesquisa teve como objetivo produzir e avaliar painéis aglomerados com resíduo de pinus medianteuma metodologia de produçãoaplicada para painéis homogêneos e outra para heterogêneos. Os painéis homogêneos e heterogêneos foram produzidos com densidade inicial de 0,550 g/cm³ e com 10% e 12% de resina de poliuretano derivado do óleo de mamona (PUR) respectivamente. Os parâmetros de prensagem foram de 5 MPa, com temperatura de 100 ºC e 10 min de prensagem, com um intervalo de 30 s. Os ensaios realizados seguiram a normativa NBR 14810-2 (ABNT, 2018). Observou-se que a reorganização das partículas dos painéis heterogêneos somada ao aumento do adesivo foram fatores que melhoraram as propriedades finais desses painéis, classificados para ser utilizados como objetos de decoração e na indústria moveleira, enquanto os painéis homogêneos não obtiveram classificação.

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“…For the slenderness index, there were differences in all waste, where bamboo had the highest index, followed by rice husk and coffee husk, respectively. The slenderness index might affect the particle-matrix contact area, since the larger this contact area, the better the particle adherence to the matrix and the greater the composite dimensional stability resulting in composites with better mechanical properties (Silva et al 2014;Cabral et al 2017). Rice husk 1.99 (0,69) A 0.87 (0,13) A 2.35 (0,86) B Coffee husk 1.84 (0,80) A 0.77 (0,17) B 1.38 (1,17) C Bamboo 2.21 (1,06) A 0.70 (0,14) B 3.11 (1,12) A Averages followed by the same letter in the column did not differ from each other by the Scott-Knott test at a 5% significance level.…”

Section: Lignocellulosic Particles Characterizationmentioning

confidence: 99%

Lignocellulosic materials as soil–cement brick reinforcement

Sabino

¹

,

Coelho

²

,

Andrade

³

et al. 2021

Environ Sci Pollut Res

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The need for environmental preservation requires civil engineering to reach new concepts and technical solutions aiming at the sustainability of its activities and products. In this context, this study aimed to evaluate the effect of using different types and percentages of vegetable particles on the physical, mechanical and thermal properties of soil-cement bricks. Bamboo, rice husk and coffee husk particles at 1.5 and 3% percentages and a control treatment not using the particle were evaluated. The chemical properties, shrinkage, compaction, consistency limits and grain size were characterized for the soil; and the anatomical, chemical and physical properties for the lignocellulosic particles. The bricks were produced using an automatic press and characterized after the curing process for density, water absorption, porosity, loss of mass by immersion, compressive strength, durability and thermal conductivity. The increase in the lignocellulosic waste percentage caused a mechanical strength decrease and bricks` porosity and water absorption increase. However, it caused a decrease in density and an enhancement in loss of mass and thermal insulation properties. The bricks produced with rice husk obtained the best results in terms of mechanical and thermal properties, and were still among the best treatments for physical properties, standing out among the lignocellulosic waste as an alternative raw material source for soil-cement bricks production.

show abstract

“…For the slenderness index, there were differences in all waste, where bamboo had the highest index, followed by rice husk and coffee husk, respectively. The slenderness index might affect the particle-matrix contact area, since the larger this contact area, the better the particle adherence to the matrix and the greater the composite dimensional stability resulting in composites with better mechanical properties (Silva et al 2014;Cabral et al 2017). (1,12) A Averages followed by the same letter in the column did not differ from each other by the Scott-Knott test at a 5% significance level.…”

Section: Lignocellulosic Particles Characterizationmentioning

confidence: 99%

Lignocellulosic Materials as Soil-cement Bricks Reinforcement

Sabino

¹

,

Coelho

²

,

Andrade

³

et al. 2021

Preprint

2

0

View full text Add to dashboard Cite

The need for environmental preservation requires civil engineering to reach new concepts and technical solutions aiming at the sustainability of its activities and products. In this context, this study aimed to evaluate the effect of using different types and percentages of vegetable particles on the physical, mechanical and thermal properties of soil-cement bricks. Bamboo, rice husk and coffee husk particles at 1.5 and 3% percentages and a control treatment not using the particle were evaluated. The chemical properties, shrinkage, compaction, consistency limits and grain size were characterized for the soil; and the anatomical, chemical and physical properties for the lignocellulosic particles. The bricks were produced using an automatic press and characterized after the curing process for density, water absorption, porosity, loss of mass by immersion, compressive strength, durability and thermal conductivity. The increase in the lignocellulosic waste percentage caused a mechanical strength decrease and bricks` porosity and water absorption increase. However, it caused a decrease in density and an enhancement in loss of mass and thermal insulation properties. The bricks produced with rice husk obtained the best results in terms of mechanical and thermal properties, and were still among the best treatments for physical properties, standing out among the lignocellulosic waste as an alternative raw material source for soil-cement bricks production.

show abstract

Painéis de partículas com maravalha de Pinus spp. e fibra de sisal

Cited by 6 publications

References 14 publications

Painéis aglomerados com resíduo de Pinus caribaea var. caribaea com adesivo bicomponente sustentável

Painéis aglomerados com resíduo de Pinus caribaea var. caribaea com adesivo bicomponente sustentável

Lignocellulosic materials as soil–cement brick reinforcement

Lignocellulosic Materials as Soil-cement Bricks Reinforcement

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