| Abstract [eng] |
The aim of master’s theses – to find out exploitation properties of thermally modified oak wood, gluing it with three different glue species (PVA D2, PVA D4, PU) and estimate strength of the bond. For comprising oak wood samples are using which are not thermally modified. The object of the investigation – oak sawn timber samples. To investigate these samples, they have been exploring with different heating modes and with developed an aggressive environment. Thermally modified wood for aesthetic appearance and dimensional stability are ideal for indoor and outdoor decoration, especially for buildings plating, terraces, balconies, fences and saunas. To modify large assortments of wood thermally will cost more and it is possible that there will appear some defects, for example, such as cracks. For this reason, it is possible to heat the smaller size assortments and bonding them to each other. As the thermally modified wood is hydrophobic, it is very important to choose the right species of adhesive to obtain a stable product. For the investigation were used specimens of oak sawn wood, which were divided into 4 groups according heating temperature and each group into 3 subgroups according to the type of adhesive used in bonding. Heat-treated and untreated oak wood samples were glued together. Was created environment conditions in which the samples were stored. Samples were subjected to negotiate of environmental change conditions, 5 recurring cycles. Next step was to determine the bond strength, with a method when samples are pulling along, according to the DIN EN 205 standard. Also, tests were made with resonant vibrations method. |
