In the near future, due to climate change, changes in the composition of forests and at the same time the increase of wood consumption only began to be lacking wood. As a result tree species will appear in the forests and later on the market, which we have not yet used for commercial purposes including invasive wood species for our places. The natural resistance of these in most cases is not yet known, so as part of the master's thesis we focused on tests to determine the natural resistance, density, rate of wetting and absorption of water, contact angle of water on wood, rate of water absorption with tensiometer, weight loss and based on these data, calculated the relative lifespan of the wood of the five selected invasive species (Box elder, Horse chestnut, Ailanthus, Honey locust and Black locust). Both unmodified and thermally modified wood were tested at different modification temperatures. We have found that thermal modification of species with poorer natural resistance can only improve this, while also improving some other relevant properties of wood. Among the most resistant species of wood, with an estimated longest lifespan, are Black locust and Honey locust and the worst results were recorded in Box elder.
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