Resonance Acoustic and Colorimetric Characteristics of Wood in Old Structures

The reserves of resonance wood in the forests of the planet are limited, and in many countries they are completely absent, since it is formed only under certain habitat conditions in some trees with genetically determined properties. Therefore, the investigation of correlation between acoustic and colorimetric parameters of coniferous wood retreads has scientific and practical importance for the development of non-destructive methods of resonance material identification in the elements of old structures to reveal additional sources of raw materials. The article presents the results of complex dendro-acoustic and colorimetric studies of spruce and pine wood. The RGB levels for seasoned wood in the additive color model were found to be on average 12 % lower than those for recently harvested wood. The analysis showed that the interrelation of RGB levels with acoustic constant (K) is weak (r2 < 0.3) for all groups of seasoned wood samples. It was also found out that 39 % of the spruce samples and 23 % of the pine sapwood samples selected from the seasoned wood can be attributed to resonance wood, since their K ≥ 12 m4/kgs. Thus, old wooden structures made of spruce wood and pine sapwood to be slated for destruction due to the long term operation are of great practical interest as a source for producing resonance wood with unique dendro-acoustic properties. It was found that within the same wood species or part of a tree (sapwood, heartwood), the color remains constant, and only the tone varies. Although the results of the study of wood colorimetric properties and acoustic constant did not show a high level of correlation, the research in this area is still relevant. This result may be due to the imperfection of the color determination technique, namely the need to consider the different number and parameters of the annual rings that fall into the colorimeter measuring window. Overall, the results presented in this paper can be used in the development of new methods of express wood diagnostics in construction. For citation: Fedyukov V.I., Chernov V.Yu., Chernova M.S., Tsoy O.V. Resonance Acoustic and Colorimetric Characteristics of Wood in Old Structures. Lesnoy Zhurnal = Russian Forestry Journal, 2022, no. 6, pp. 164–177. (In Russ.). https://doi.org/10.37482/0536-1036-2022-6-164-177