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National Repository of Grey Literature 3 records found  Search took 0.00 seconds. 
Wood in the sauna is a bridge to nature
 Polášek, Marek
Which wood is suitable for use at saunas? Artificially dried wood versus naturally dried wood. Domestic wood versus exotic wood. Public saunas versus home´s saunas. Cheap wood versus expensive wood.
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Coatings for termowood - useful types and their testing.
 Lišková, Tereza ; Pánek, Miloš (advisor) ; Oberhofnerová, Eliška (referee)
This work deals with specific requirements regarding finishing of thermally modified wood for exterior use. A theoretical part includes information about features of thermally modified wood, finishing products and recommended procedures for protecting. Next chapter describes assessment of testing procedures, use of those methods during in real scenarios, measurement and evaluation of results. Measured values are evaluated in the application STATISTICA 12 and represented using graphs and tables. It includes list of used materials, finishing products. It also describes tests made using spectrophotometer and roughness tester. Last chapter of this works describes options how to increase color permanency of thermally modified wood. It also includes recommendations for selection of suitable finishing product.
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Rheological characteristics of untreated and thermally modified wood under long-term loading in bending
 Berková, Tereza ; Borůvka, Vlastimil (advisor) ; Ruman, Daniel (referee)
Heat-treatment belongs to the most ecological methods of wood preservation methods and increase of its natural stability in exposition to outdoor conditions. Research of mechanical properties opens new possibilities of thermowood usage in general. Wood appertains to viscoelastic materials and due to long-term loading creeps. There currently rise both elastic deformation, deformation elastic in time and plastic deformation. Partially there are irreversible changes due to stress even after unloading. This work presents first insight to the matters of thermowood rheology and inspects its behavior under long-term loading in bending. This paper compares ratio of these three types of deformation in untreated wood and thermally modified wood in seven different temperatures (140; 160; 180; 190; 200, 210°C). The samples were exposed to 600 hours applied loading covering 40% of ultimate stress (modulus of rapture). Test were performed under constant conditions in special creep units in conditioning kiln. Increasing deformation under constant load was analyzed by Burger rheological model. The results show that samples treated under lower temperatures (140 and 160°C) exhibit greater creep than untreated wood. This result is positive for structural usage of wood. On the other hand the samples treated under higher temperatures levels (200 an 210°C) display deterioration of mechanical properties. This is due to changes in wood structures caused by heat-treatment. The most important impact of this work goes to future research of this field. Next development has to apply for the best quality of samples and also select rather prismatic parallelism than transversal one. Also application of 40% ultimate stress loading appeared as too high and together with wood defects led to destruction of samples.
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