Thermal modification of most representative Portuguese wood species: a preliminary study
- Autores: João Costa, Jorge Manuel Gonçalves Branco, Aires Camoes
- Localización: Revista de la Construcción, ISSN-e 0718-915X, ISSN 0717-7925, Vol. 18, Nº. 3, 2019, págs. 488-500
- Idioma: inglés
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Resumen
The thermal modification has proved to be an effective method to improve the durability of wood elements. Until now, most applications of thermally modified wood have been limited to non-structural applications since the wood’s heat treatment leads to a significant reduction in mechanical performances.However, there is noknowledge about these treatments applied onthe wood species more used in Portuguese constructions. In order to evaluate the effect of heat treatment on the wood species of Maritime pine(Pinus pinaster), Eucalyptus (Eucalyptus globulus), Beech (Fagus sylvatica), Acacia (Acacia melanoxylon) and Oak (Quercus faginea), an experimental program consisted of mechanical bending tests anddimensional stability tests (shrinkage, swelling and equilibrium moisture content)was defined. For comparisonpurposes, all tests were made with test specimens of non-modified and thermally modified woodusing fourtemperaturevalues (200ºC, 240ºC, 260ºCand 300ºC) and three exposed periods (2, 4 and 8hours).The obtained results show that the behaviour of the studied experimented species wassimilar to theone ofother species already studied in the available literature.It was possible to point out that mechanical propertiesdecreasewith the severity of the thermal treatment, while the dimensional stability improved.
