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ŠUMARSKI LIST 9-10/2019 str. 47     <-- 47 -->        PDF

The decrease in beech wood hardness recoreded in this work was less than the decrease in beech wood hardness recorded by Yildiz (2002). He determined the greatest decrease in hardness values when beech samples were treated at 180 ºC for 10 h, and hardness decrease of 25.9%, 45.1%, and 41.8% were observed for longitudinal, radial, and tangential directions, respectively.
The ratio between Brinell hardness and density at 12% EMC of thermally modified and unmodified beech wood on three sections are shown in Figure 1. It was determined that the changes in wood density significantly affect Brinell hardness on all sections of thermally modified and unmodified wood.
Invesigated Brinell hardness of thermally modified hornbeam wood is lower than unmodified hornbeam wood on all three sections. Average Brinell hardness of thermally modified hornbeam wood was lower for 6% on cross section, it was lower for 18% on radial section and it was lower for 13% on tangential section (Table 3). Statistical analysis showed there is sigifficant difference between Brinell hardness of thermally modified and unmodified hornbeam wood on all three sections (Table 4 and Figure 4).