As biological material wood is exposed to decay. There is strong correlation between natural wood resistance to decay and the ability of wood to remain dry. If wood moisture is below 20 % there is less chance for fungus to infect the wood. Separate wood species are used in different applications, that are more or less exposed to moisture. The aim of the research was to lighten the moisture dynamics of wood outdoor and to check the suitability of different methods of moisture determination. The samples of selected wood species were exposed to outdoor weather conditions. We have used the gravimetric method to determine wood moisture of wood samples random and continuously. We have settled wood samples on narrow brackets and we have manually, weekly, determined their weight. Some of the samples were settled on automatic libra, which determined their weight every 50 seconds. We have also determined the moisture dynamic of wood samples in laboratory. We have determined the short term water uptake. We compared the results and discovered suitability of ranges among wood species. It figured out, that the results were conditionally comparable. At the beginning it became clear that there are some shortcomings of the continuously measuring method. There is the influence of some external factors, such as wind, trash, snails, bugs, snow, ice and water on the surface of the samples that affects results but the continuously measuring method does not recognize and eliminate them.
|
