1) La descarga del recurso depende de la página de origen
2) Para poder descargar el recurso, es necesario ser usuario registrado en Universia


Opción 1: Descargar recurso

Detalles del recurso

Descripción

Heat treatment improves some wood properties namely: equilibrium moisture, dimensional stability and durability and mechanical properties. In this study, the heat treatment was applied to woods of three natural species from Brazil: Aspidosperma populifolium (peroba mica), Dipteryx odorata (cumaru) and Mimosa scabrella (bracatinga). The woods were heated in an oven under vacuum and under nitrogen, at 180, 200, and 220°C for one hour. The untreated and heat-treated woods were characterized in relation to equilibrium moisture content, basic density, shrinkage, Janka hardness, and bending MOR and MOE according to NBR 7190 standards. All the thermal rectified woods showed a reduction in the hygroscopic equilibrium content, especially when the heating was under vacuum from 13-15% in the untreated woods to 1-3% for vacuum treatment at 220 °C. The dimensional stability was improved to only a small extent e.g. volumetric shrinkage tended to decrease with increasing temperature. The mechanical properties were affected differently for the three wood species. Heat-treated cumarushowed increased Janka hardness, MOR and MOE; and peroba mica increased MOR and MOE but not Janka hardness; while bracatinga was less influenced by the heat treatment

Pertenece a

UTL Repository Universidade Técnica de Lisboa   

Autor(es)

Araújo, Solange de Oliveira -  Vital, Benedito Rocha -  Oliveira, Braulio -  Carneiro, Angélica de Cássia Oliveira -  Lourenço, Ana -  Pereira, Helena - 

Id.: 69966310

Idioma: eng  - 

Versión: 1.0

Estado: Final

Palabras claveAspidosperma populifolium - 

Tipo de recurso: article  - 

Tipo de Interactividad: Expositivo

Nivel de Interactividad: muy bajo

Audiencia: Estudiante  -  Profesor  -  Autor  - 

Estructura: Atomic

Coste: no

Copyright: sí

: openAccess

Requerimientos técnicos:  Browser: Any - 

Fecha de contribución: 03-mar-2018

Contacto:

Localización:
* "Maderas. Ciencia e Tecnologia". ISSN 0718-221X. 18 (1) 2016, p.143-156
* 0718-221X
* 10.4067/S0718-221X2016005000015

Otros recursos del mismo autor(es)

  1. A criança cigana e a escola 58 f.
  2. Bark anatomy, chemical composition and ethanol-water extract composition of Anadenanthera peregrina and Anadenanthera colubrina The bark of Anadenanthera peregrina (L.) Speg and Anadenanthera colubrina (Vell.) Brenan were charac...
  3. Variation of ring width and wood density in two unmanaged stands of the Mediterranean oak Quercus faginea Ring width and wood density variation were studied from pith-to-bark and along the stem in two natur...
  4. São João (Calvário): estudo e conservação de uma escultura em madeira policromada da Colecção Comandante Ernesto Vilhena, do Museu Nacional de Arte Antiga O relatório que se apresenta pretende descrever todo o processo de estudo e intervenção efectuados n...
  5. $rec.titulo

Otros recursos de la mismacolección

  1. Towards integrated fire management - Outcomes of the European Project Fire Paradox info:eu-repo/semantics/publishedVersion
  2. Ecological and ecotoxicological responses in the assessment of the ecological status of freshwater systems: A case study of the temporary stream Brejo of Cagarrão (South of Portugal) The objective of the study was to assess the integrated use of macroinvertebrate indexes and ecotoxi...
  3. Sobrevivência do pinheiro-bravo após incêndio. Método dos atributos vitais Mestrado em Engenharia Florestal e dos Recursos Naturais - Instituto Superior de Agronomia
  4. Population persistence in landscapes fragmented by roads: disentangling isolation, mortality and the effect of dispersal Linear infrastructures, one of several forms of land-use, are a major driver of biodiversity loss. R...
  5. Genetic and genomic tools to assist sugar beet improvment: the value of the crop wild relatives Perspective

Aviso de cookies: Usamos cookies propias y de terceros para mejorar nuestros servicios, para análisis estadístico y para mostrarle publicidad. Si continua navegando consideramos que acepta su uso en los términos establecidos en la Política de cookies.