Preservative treated wood is exposed to various biotic and abiotic factors, which is why we wanted to know how the properties of wood are changed during utilization. Spruce, pine (sapwood) and larch (heartwood) samples of the dimensions of (1.5 % 2.5 % 5.0) cm3 were impregnated with a commercial biocide product Silvanolin, of two different concentrations of Ccu = 0.25% and CCU = 0.5 %. The samples were impregnated by four different processes: the process of dipping the samples in the preservative solution for 8 h, the process of dipping the samples in the preservative solution for 24 h, the vacuum impregnation process and the vacuum pressure impregnation process.Determination of the sorption properties was divided into two parts: the uptake of liquid water uptake and absorption of water vapour. For determination of uptake of liquid water, we used: a short-term process of capillary uptake of water, dipping of the samples in water for 24 h and determination of absorption dynamic of water droplets into wood, with a goniometer. Absorption of water vapour: was determined by equilibration of the samples in the chamber with a 100 % relative humidity and subsequent drying of the samples in the chamber over a silica gel. In most cases we have found out that in the impregnated samples there is a higher equilibrium moisture content than in the untreated samples and that the impregnated samples absorb more water than the parallel controls
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