Özet:

In this study, mechanical properties such as static bending resistance and elastic modulus of elasticity in static bending with physical properties such as density were investigated in heat-treated wood species. The color change from the physical properties was determined separately after natural and accelerated weathering in the test samples on which the surface treatment was applied. Firstly, study trees which naturally grown in Turkey were selected aspen (Populus tremula-TK), ash (Fraxinus angustifolia-DYD), spruce (Picea orientalis-DL), and fir (Abies bornmülleriana-UG). Subsequently, they were subjected to heat treatment with the ThermoWood® method. Afterward, test samples for oven-dry density (TQM), air-dry density (HKY) and static bending resistance (ED), and static bending elasticity modulus (EM) test samples for DYD and UG, as well as test samples to be weathering from all tree species were prepared. Surface treatment was applied to the weathering test samples with a water-based varnish (SBV) with three different contents: one-component (STB), two-component (SÇB) and colored (SRV). Then, natural weathering (DY) for 190 days and accelerated weathering (QUV) for 336 hours were performed on the samples. After weathering tests, the smallest values in SRV were obtained. According to the results of the study, it can be said that one of the most effective measures to be taken against color change in outdoor use of heat-treated wood materials is to use SRV. On the other hand, it was determined that the density values and static bending resistance (ED) decreased and the elastic modulus (EM) value in static bending increased in HT test samples compared to the control samples (K).