Propriedades da Madeira de Eucalyptus umbra R. T. Baker em Função do Diâmetro e da Posição Radial na Tora

Lima, Israel Luiz de; Longui, Eduardo Luiz; García, Rafael Cabrera; Luca, Edgar Fernando de; Júnior, Francides Gomes da Silva; Flörsheim, Sandra Monteiro Borges

doi:10.4322/floram.2011.049

Cited by 8 publications

(12 citation statements)

References 11 publications

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“…Eucalyptus umbra is a species from Australia, with little diametric, Specific gravity, chemical constituents and anatomical characteristics variabilities [17]. In addition, Eucalyptus umbra is resistant to attack by bio-deterioration agents [18].…”

Section: Introductionmentioning

confidence: 99%

“…Eucalyptus umbra wood presented higher density and lower f c0 and f M values compared to hybrid Eucalyptus urophylla x Eucalyptus grandis. Physical and mechanical properties of Eucalyptus umbra wood at 12% and 30% moisture contentsLima et al (2011) [17] evaluated for 25 years-old Eucalyptus umbra trees from a forest area at Piracicaba city, in Sao Paulo State, ρ ap 0.621 g/cm 3 (12% moisture content).…”

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confidence: 99%

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Properties of Eucalyptus umbra Wood for Timber Structures

Nogueira¹,

Almeida²,

Vasconcelos³

et al. 2018

ijme

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This study involved the study of physical and mechanical properties of Eucalyptus umbra wood for its use in timber structures. Two physical and fourteen mechanical properties tests were performed according to Brazilian code ABNT NBR 7190:1997. Two moisture contents were considered: above the Fiber Saturation Point (30%) and standardized point 12%. Decreasing the moisture content, this study presented an increase in eight mechanical properties. Oppositely, five mechanical properties presented decreasing of values, and one single variable persisted stable. But statistical perspective supported by the t-test, only three mechanical properties (f t90 , f H0 and W) increased significantly. According to results obtained in this study, it is possible to use Eucalyptus umbra wood as raw material for structures.

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Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

Properties of Eucalyptus umbra Wood for Timber Structures

Nogueira¹,

Almeida²,

Vasconcelos³

et al. 2018

ijme

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“…For the tree diameter class of 8.1 cm, the highest value was in the intermediate zone, but there was no statistical difference between the radial sampled areas. In general, the increment trend is evidenced by the wall thickness of the fiber considering the pith to bark direction, corroborating the variation commonly found in the wood fibers of the Eucalyptus spp., in which some authors have found an increase in it (Evangelista et al, 2010;Lima et al, 2011;Ramos et al, 2011;Sette et al, 2009;Silva et al, 2007).…”

Section: Fibers Dimensions Of Charcoalmentioning

confidence: 98%

Anatomy of Charcoal and Carbonization Effect under Eucalyptus Fibers’ Dimensions

et al. 2020

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The anatomy of wood and charcoal was analyzed by scanning electron microscopy in three radial positions of E. urophylla and E. Grandis in different diameter classes at six years. The carbonization process was given in the muffle with an average rate of 0.5 °C increment per minute, using initial temperature of 150 °C and maximum of 450 °C. It was observed that the pore diameter presented higher values in the samples obtained in the internal position. The diameter classes of the trees almost did not influence the characteristics of the fibers. In the external position (close to the shell) fibers with higher values of cell wall thickness and smaller values of lumen diameter and width were identified. The fiber lumen diameter was not affected by the wood carbonization process, whereas the cell wall thickness and fiber width were reduced.

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“…No Brasil, estudos dessa natureza são predominantes para as espécies dos gêneros Eucalyptus e Pinus. No entanto, pesquisas relacionadas às espécies nativas vêm crescendo, como exemplo destacam-se os trabalhos de Longui et al (2010); Lima et al (2011a); Valente et al (2013); Delucis et al (2013).…”

Section: Introductionunclassified

Propriedades físicas da madeira de Calycophyllum spruceanum Benth. em função do diâmetro e da posição (base e topo) no fuste

Araújo¹,

Sousa²,

Nascimento³

et al. 2016

Sci. For.

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ResumoO conhecimento das propriedades tecnológicas da madeira é fundamental para o manejo e uso racional das espécies florestais. O estudo das propriedades físicas da madeira de Calycophyllum spruceanum teve por objetivo fornecer subsídios para a produção de madeira em floresta de várzea estuarina. Foram coletadas amostras de madeira na base e topo do fuste de 15 árvores com diferentes diâmetros para a determinação das propriedades físicas (densidade básica, fator anisotrópico e contrações axial, radial, tangencial e volumétrica), conforme norma NBR 7190/97. A madeira de C. spruceanum apresentou média geral de 0,65 g.cm -3 para densidade básica, 5,1% para contração radial, 7,3% para contração tangencial, 14,1% para contração volumétrica e 1,6 para fator anisotrópico. Pela análise de covariância verificou-se efeito significativo da posição no fuste apenas para fator anisotrópico e contração tangencial, em que os maiores valores para estas propriedades foram obtidos na base do fuste das árvores. A inexistência de efeito significativo do diâmetro à altura do peito (DAP) das árvores sobre as propriedades físicas estudadas, associada aos valores de densidade básica e adequados, sob o aspecto da estabilidade dimensional, para o fator anisotrópico evidenciam o potencial madeireiro da espécie, mesmo proveniente de indivíduos menores que o diâmetro mínimo de corte (50 cm), estabelecido pela legislação brasileira.Palavras-chave: densidade básica, floresta de várzea, pau-mulato, qualidade da madeira, retratibilidade. AbstractThe knowledge of the technological properties of the wood is important for the management and rational use of forest species. The study of the physical properties of Calycophyllum spruceanum wood aims to provide subsidies for timber production in estuarine floodplain forests. Samples were collected at base and top of the stem from 15 trees with different diameters to determine the physical properties (basic density, anisotropic factor and axial, radial, tangential and volumetric shrinkage), according to NBR 7190/97. C. spruceanum wood showed overall average of 0.65 g.cm -3 for density, 5.1% for radial shrinkage, 7.3% for tangential shrinkage, 14.1% for volumetric shrinkage and 1.6 for anisotropic factor. By analysis of covariance there was a significant effect of position on the stem only for anisotropic factor and tangential shrinkage, where the highest values for these properties were obtained at the base of the stem of the trees. The inexistence of significant effect of diameter at breast height (DBH) trees on the physical properties studied associated with values of basic density and adequate, from the aspect of dimensional stability for the anisotropic factor show that the timber of the species presents possibilities to be used as solid wood, even from trees under the minimum logging diameters (50 cm), established by Brazilian law.

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Propriedades da Madeira de Eucalyptus umbra R. T. Baker em Função do Diâmetro e da Posição Radial na Tora

Cited by 8 publications

References 11 publications

Properties of Eucalyptus umbra Wood for Timber Structures

Properties of Eucalyptus umbra Wood for Timber Structures

Anatomy of Charcoal and Carbonization Effect under Eucalyptus Fibers’ Dimensions

Propriedades físicas da madeira de Calycophyllum spruceanum Benth. em função do diâmetro e da posição (base e topo) no fuste

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