Caracterização completa da madeira da espécie amazônica Paricá (Schizolobium amazonicum Herb) em peças de dimensões estruturais

Almeida, Diego Henrique de; Scaliante, Ricardo de Mello; Macedo, Laurenn Borges de; Macêdo, Alcebíades Negrão; Dias, Antônio Alves; Christofóro, André Luis; Calil, Carlito

doi:10.1590/s0100-67622013000600019

Cited by 67 publications

(68 citation statements)

References 2 publications

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“…Because of its renewable source and relative abundance in reforestation and forest management areas, the said material has strong potential for use, so depending on characterization work and study of its properties, for better employability, once it is extracted and used with low level of processing (mechanical processing mainly) [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Density as Estimator of Shrinkage for Some Brazilian Wood Species

Cavalheiro¹,

Almeida²,

Almeida³

et al. 2016

ijme

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Shrinkage and coefficient of anisotropy are fundamental physical parameters in analysis of dimensional stability of timber structures members. In Brazil, properties of wood are obtained according to assumptions and calculation required by Annex B of ABNT NBR 7190: 1997 (Timber Structures Design). Among the physical properties, density appears as the easiest one to be experimentally obtained, defined by ratio between mass of the sample and its volume. To evaluate the possibility of estimating shrinkage (longitudinal, RL; radial, RR; tangential, RT; volumetric, RV; and coefficient of anisotropy, CA) of wood depending on density, this study aimed to test regression models (linear, exponential, logarithmic, geometric) using basic density (ρ bas ) and apparent density (ρ 12 ) as independent variables. For this purpose, five wood species belonging to conifers: Pinus sp., Pinus oocarpa; and dicotyledonous: Paricá (Schizolobium amazonicum), Jatobá (Hymenaea sp.) and Lyptus®, were employed. In all, 23 samples for Pinus sp.; 15 for Pinus oocarpa; 28 for Paricá; 16 for Lyptus®; and 11 for Jatobá were produced, totaling 651 determinations. Results of analysis of variance for regression models indicated insignificance of the adjustments obtained by adopting densities as estimators of shrinkage and coefficient of anisotropy for this set of wood species. Only models involving basic density and apparent density were significant, wherein the optimal settings were from linear case, exhibiting coefficient of determination (R 2 ) 91.72% (for softwoods) and 83.36% (for hardwoods).

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Section: Introductionmentioning

confidence: 99%

Density as Estimator of Shrinkage for Some Brazilian Wood Species

Cavalheiro¹,

Almeida²,

Almeida³

et al. 2016

ijme

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“…(Freitas et al, 2015), Pinus and Teca (Almeida et al, 2014), Cedrela fissilis, Clonal hybrids and Hovenia dulcis (Motta et al, 2014), ranging from 0.478 to 0.577 g/cm³. Light wood, such as Toona ciliata (Braz et al, 2013), Paricá (Almeida et al, 2013) and Gallesia integrifólia (Motta et al, 2014) have a density varying between 0.318 g/cm³ and 0.370 g/cm³.…”

Section: Resultsmentioning

confidence: 99%

“…In addition, with increasing population awareness of the use of materials that cause the least damage to the environment, wood from planted forests is a resource of great potential (Almeida et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

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Full Characterization of Calycophyllum Multiflorum Wood Specie

et al. 2017

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Wood is a material that for years has been used by man for a variety of purposes, particularly in rural and civil constructions and furniture industry. The possibility of shortages of some wood species, the characterization of other unfamiliar species is an alternative source for use in civil and rural construction. This study aimed to determine, with the aid of Brazilian standard NBR 7190, physical and mechanical properties of Castelo (Calycophyllum multiflorum) wood specie. Twelve determinations were obtained by property, totaling 204 experimental values. In the characterization of wood, regression models were used to estimate the values of timber strength and stiffness as a function of apparent density, being density the physical property more simple to be obtained. The results of mechanical properties showed consistent with the performance of other species used in construction, which highlights the potential use of the Castelo wood in structural design. Regression models, apparent density was considered significant in the estimation of only 4 among the 14 properties for wood strength and stiffness.

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“…Estudos indicam que esta espécie pode ser lançada como alternativa mais viável e rápida que o eucalipto, sendo uma madeira muito cobiçada para a produção de compensados e a melhor espécie para a fabricação de MDF, além da rapidez, produtividade, lucratividade e proteção ambiental (Rosa, 2011;Almeida et al, 2013).…”

Section: Fundamentação Teóricaunclassified