Comparison of acoustic non-destructive methods and semidestructive methods for logs and timber assessment

0524032 - ÚTAM 2020 RIV US eng C - Konferenční příspěvek (zahraniční konf.)
Tippner, J. - Kloiber, Michal - Hrivnák, Jaroslav - Zlámal, J. - Sebera, V.
Comparison of acoustic non-destructive methods and semidestructive methods for logs and timber assessment.
Proceedings of the 62nd International Convention of Society of Wood Science and Technology. Monona: Society of Wood Science and Technology, 2019, s. 333-340. ISBN 978-0-9817876-9-5.
[International Convention of Society of Wood Science and Technology /62./. Tenaya Lodge (US), 20.10.2019-25.10.2019]
Grant CEP: GA MK(CZ) DG16P02M026
Klíčová slova: spruce * logging * hewing * beam * assessment
Obor OECD: Construction engineering, Municipal and structural engineering

The selection of high quality material is one of the first step in building of timber constructions. Hence, there is a call for techniques that would provide reliable methods for assessment of logs and timber. The goal of this study is to test spruce logs and subsequently evaluate timber by several methods, and to describe relationships between the evaluated material parameters. The trees from stand in Czech Republic with optimal ecological conditions for Norway spruce were felled during 3 seasons, consequently milled to logs and tested by several methods. Logs were processed into 68 beams made by 1. traditional carpentry way or 2. machine milling. The influence of traditional way of water treatment of timber was tested too. All the beams were tested by frequency-resonant method in the course of almost 2 years. Wood densities, sound velocities, dynamic moduli of elasticity, micro- drilling and indentation resistances were measured. The visual assessment was carried out as well. The relationships between properties were statistically tested to determine significance of manufacturing parameters, reliability of used non-destructive and semi-destructive methods to predict wood quality and also to describe the significance of harvest period or timber treatment to quality and properties of timber.
Trvalý link: http://hdl.handle.net/11104/0308344