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Navalmoral de la Mata, Spain

Dieste A.,Forestry and Wood Research Center | Rodriguez K.,Forestry and Wood Research Center | Bano V.,Forestry and Wood Research Center
European Journal of Wood and Wood Products | Year: 2013

Hygroscopic properties and water vapour permeability of chestnut (Castanea sativa Mill.) wood were studied using saturated salt solutions, and the results were analyzed using the Hailwood-Horrobin model. At 20 C/65 % the equilibrium moisture content (MC eq ) and density were 11.5 ± 0.1 % and 576.6 ± 10.2 kg m-3, respectively, and the fiber saturation point was 20.83 %. The average water vapour permeability was 0.320 kg m -1 s-1 Pa-1108, lower than that of Radiata pine (0.726 kg m-1 s-1 Pa-110 8). Furthermore, there was no difference in permeability between tangential and radial cuts. This low permeability is explained by the scant development of the multilayer of the Hailwood-Horrobin model. This is attributed to the wood extractives, which reduce the void space and hindered condensation. Chestnut wood has different vapour sorption and vapour permeability than conifers normally used in construction. © 2012 Springer-Verlag. Source

Fernandez I.,Forestry and Wood Research Center | Fernandez M.A.,Forestry and Wood Research Center | Rodriguez K.,Forestry and Wood Research Center | Bano V.,Forestry and Wood Research Center | Dieste A.,Forestry and Wood Research Center
Maderas: Ciencia y Tecnologia | Year: 2013

The anti-skid resistance of six coatings (Alfa, Beta, Gamma, Lambda, Mu and Theta) designed for outdoor wood flooring were tested in chestnut (Castanea sativa Mill.) and pine (Pinus pinaster Ait.) using a Portable Skid Resistance Tester according to standard ENV 12633. Film thickness, coating retention level, and presence of mineral particles were determined for each coating. Furthermore, the liquid water absorption coefficient of chestnut was determined in accordance with standard UNE-EN 1609, to relate all parameters. The highest value of skid resistance in both chestnut and pine was obtained with coating Mu (49.75) and coating Gamma (53.16), respectively. Film thickness and coating retention level were consistently higher for pine than for chestnut. Gamma presented the highest presence of minerals. For chestnut the absorption coefficient of liquid water in the tangential direction was 0.0056 ± 0.0010 kg.m-2.s-0.5, considerably lower than the value found for pine: 0.011 kg.m-2.s-0.5. The different performance of the system wood-coating, and consequently the anti-skid resistance, was attributed to the absorption properties of the different species. Source

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