Modificação térmica e propriedades tecnológicas da madeira de Eucalyptus cloeziana

Huller, Lenon Augusto Simon; Haselein, Clóvis Roberto; Silveira, Amanda Grassmann da; Menezes, Walmir Marques de; Talgatti, Maiara; Souza, Joel Telles de; Santini, Élio José

doi:10.4336/2017.pfb.37.90.1288

Cited by 4 publications

(5 citation statements)

References 15 publications

(12 reference statements)

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“…We also found that the swelling variable in the longitudinal direction, for E. grandis × E. urophylla, showed a reduction behavior with increased temperature. Notably, the values found for the control samples of our study are in accordance with those found by Huller et al (2017); E. grandis recorded a swelling of 0.54% under similar testing conditions. Interestingly, the tangential and radial senses of the species P. dubium, when heat-treated at 120 °C, were found to be comparative to another woody species, Tectona grandis L.f., without the application of heat treatment, highlighting the similarity between the two species (Gil et al, 2018).…”

Section: Retratibility: Shrinkage and Swellingsupporting

confidence: 91%

“…As observed for the anisotropic coeffi cient of shrinkage, there was a decrease in the results of anisotropic swelling coeffi cient with an increase in temperature. A study by Huller et al (2017) evaluating Eucalyptus cloeziana F. Muell. found that wood samples not exposed to drying recorded a value of 1.66%, similar to our fi ndings for E. grandis × E. urophylla, when treated at 150 °C.…”

Section: Retratibility: Shrinkage and Swellingmentioning

confidence: 99%

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Influence of Drying on the Physical and Mechanical Properties of Wood From Trees Grown in an Agroforestry System

et al. 2020

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The cultivation of native and exotic species intercropped in an agroforestry system raises the interest for information on the properties of wood. Therefore, different methods are being tested to improve the technological properties of this material, including drying, which causes changes in the physical and mechanical properties of the wood. The present study investigated the influence of drying on the physical and mechanical properties of wood from tree species grown in an agroforestry system. Parapiptadenia rigida (Benth.) Brenan, Peltophorum dubium (Spreng.) Taub., Eucalyptus grandis W. Hill × Eucalyptus urophylla S.T. Blake (hybrid), and Schizolobium parahyba (Vell.) S.F.Blake were the species selected for the study. Three 9-year-old individuals of each of the species were obtained from an agroforestry system. Thirty wood samples (2.5 × 2.5 × 41 cm) were extracted from each species. The wood samples were divided between temperature treatments; 6 samples were used for each heat treatment (control, 120, 150, 180, and 210 °C), which were then dried for two hours in an oven (with forced air circulation). Following the heat treatment, the mechanical properties of wood samples were evaluated to determine the modulus of elasticity and rupture, the tension in the proportional limit, and maximum force according to the ASTM D-143-94 (2000) standard. Finally, the physical properties of the retractability of the wood samples were evaluated according to the NBR 7190 (ABNT, 1997) standard. Specimens used to analyze this variable came from sections of the wood (sample dimensions: 2.5 × 2.5 × 5 cm) not affected by the static bending test. Our findings indicate that, for all species investigated in this study, drying alters the physical and mechanical properties of the wood, with the most significant changes occurring at temperatures between 120 and 180 °C.

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Section: Retratibility: Shrinkage and Swellingsupporting

confidence: 91%

Section: Retratibility: Shrinkage and Swellingmentioning

confidence: 99%

Influence of Drying on the Physical and Mechanical Properties of Wood From Trees Grown in an Agroforestry System

et al. 2020

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“…Similar behavior was cited by Huller et al (2017) for the species of E. cloeziana in which, the average value of radial, tangential and longitudinal swelling of the control samples were 8.84, 14.79, and 0.54%, respectively, decreasing to 6.78, 9.52, and 0.48% when exposed to 210 °C temperature. This occurrence may be linked to the different basic density values of each species, with denser woods presenting a higher percentage of wall thickness and, thus, a greater site for water absorption (Zaque et al, 2018).…”

Section: /7supporting

confidence: 83%

Effect of thermal modification on the technological properties of wood from species in an agroforestry system

Bandera

Eloy

Trevisan

et al. 2021

Agraria

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This work aims to evaluate the effect of thermal modification on the physical and mechanical properties of species of wood, from an agroforestry system. The species evaluated were Parapiptadenia rigida (Benth.) Brenan, Peltophorum dubium (Spreng.) Taub., Eucalyptus grandis × Eucalyptus urophylla and Schizolobium parahyba (Vell.) Blake, aged nine. The specimens were submitted to thermal treatments (120, 150, 180 and 210 °C), in addition to the control samples. For the mechanical properties, the modules of elasticity and rupture, tension in the proportional limit and maximum force were evaluated according to ASTM D 143-94. For the physical properties of basic density and shrinkage, the evaluation took place according to NBR 7190. The thermal treatment modified the mechanical properties of the wood in a positive way up to 180 ºC, with the highest values being observed for E. grandis × E. urophylla and P. rigida. Likewise, the heat treatment has modified the physical properties of wood retractability in a positive way up to 210 ºC, with the anisotropic coefficient decreasing with increasing temperature. Thus, it is concluded that the thermal modification alters the physical and mechanical properties of the four analyzed species. Furthermore, it is perceived that for the case of mechanical characteristics these changes are positive up to a temperature of 180 ºC, while for the physical ones the best results are found at a temperature of 210 ºC.

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“…As propriedades mecânicas da madeira tratada termicamente foram estudadas por Huller et al (2017), cujo objetivo foi avaliar o efeito do tratamento térmico nas propriedades físicas e na resistência mecânica de Eucalyptus cloeziana. Foi constatado que a resistência máxima ao impacto foi influenciada pela temperatura, havendo decréscimo dos valores com o aumento da mesma.…”

Section: Influência Nas Propriedades Físico-mecânicasunclassified

Estudos em Ciências Florestais e Agrárias

Andrade

2023

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A obra que apresentamos conta com uma variedade de capítulos que abrangem diferentes áreas da ciência florestal e agrícola, fornecendo um panorama amplo dos temas abordados. Desde a descrição morfológica e caracterização anatômica do colmo maduro do bambu gigante da Amazônia (Guadua aff. lynnclarkiae) até a viabilidade econômica da geração distribuída e compartilhada de energia elétrica com biomassa florestal, os capítulos apresentam uma riqueza de informações valiosas para pesquisadores, estudantes e profissionais das áreas afins. Os capítulos sobre as dimensões de fibras em árvore de Corymbia citriodora com lenho de reação, as contribuições da agroecologia para a construção de um novo direito agrário brasileiro e as considerações sobre a modificação térmica para a melhoria da qualidade do piso de deck de madeira, fornecem conhecimentos específicos e aplicáveis em suas respectivas áreas. O estudo de caso sobre as parcerias empresariais para a criação de consórcio de geração de energia elétrica, por sua vez, oferece uma perspectiva prática e atualizada sobre a gestão de recursos energéticos. A descrição dendrométrica de povoamento de araucária no instituto federal do sudeste de Minas Gerais, o cultivo do algodão de ponta a ponta com manejo fitotécnico, nutricional e fisiológico, a ecofisiologia da germinação e produção de mudas de jatobazeiro, o estudo fitoquímico da Melochia tomentosa L. (Malvaceae) e a aplicação de biofertilizante de polpa de café no desenvolvimento morfológico da cultura de alface (Luctuca sativa L.) complementam a obra com suas contribuições valiosas para a compreensão dos aspectos biológicos e culturais da produção agrícola e florestal. Em suma, esta obra é uma fonte rica e completa de informações sobre ciência florestal e agrícola, apresentando estudos, pesquisas e estudos de caso que contribuem para o desenvolvimento dessas áreas e para a gestão sustentável dos recursos naturais.

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Modificação térmica e propriedades tecnológicas da madeira de Eucalyptus cloeziana

Cited by 4 publications

References 15 publications

Influence of Drying on the Physical and Mechanical Properties of Wood From Trees Grown in an Agroforestry System

Influence of Drying on the Physical and Mechanical Properties of Wood From Trees Grown in an Agroforestry System

Effect of thermal modification on the technological properties of wood from species in an agroforestry system

Estudos em Ciências Florestais e Agrárias

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