Abstract
Natural weathering performance of thermally treated poplar and black pine wood
Highlights
Timber is proven to be advantageous construction material, it is characterized by some disadvantages, inherent to its hygroscopic nature
One stem per species was cut parallel to the grain, preparing boards that were placed for about 8 months in an air-conditioned room at a temperature of 20 oC ± 2 oC and 60 % ± 5 % relative humidity and left there till a constant weight, recording the equilibrium moisture content (EMC) of 10,50 % for poplar and 11,44 % for pine wood (ISO 13061-1 (2014))
The dimensions of the boards prior to the treatment were 35 mm thick, 70 mm wide, 400 mm in length, with their length to be in a direction parallel to the grain, while they consisted mainly of sapwood part, and the sampling method was based on the methodology of ISO 3129 (2019). 10 boards per species, poplar and Natural weathering performance..: Kamperidou and Barboutis pine, were subjected to each of the different thermal modification treatments
Summary
Timber is proven to be advantageous construction material, it is characterized by some disadvantages, inherent to its hygroscopic nature. The hygroscopicity of wood is related to the alterations in wood dimensions, due to changes in the air humidity, which cause difficulties to its application in structures, especially if the anisotropy of wood is taken into consideration. Universidad del Bío-Bío to micro-organisms action and changes in appearance and decomposition after exposure to environmental conditions, where degradation factors prevail, such as the solar UV factor, changes in temperature, relative humidity, rain, snow and, air. Especially the ultraviolet one, in combination with humidity, temperature and oxygen of the atmosphere, results in various physicochemical effects such as a decrease in the degree of polymerization of cellulose, breakage of chemical bonds, intercellular layer among others, and reduction of mechanical strength. It is believed that the degradation of wood, resulting from its aging, is mainly attributed to the disruption of the cell walls lignin network in the surface of wood, which creates surface irregularities and favorable conditions for the growth and catastrophic action of fungi, microfungi, bacteria and insects that cause the mechanical strength deterioration (Rajković and Miklečić 2012)
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