Ultrasound application to evaluation of small round timber mechanic properties
DOI:
https://doi.org/10.3989/ic.2007.v59.i506.511Keywords:
small round timber, Pinus nigra subsp. Saltzmannii, timber characterizationAbstract
In this study is shown the mechanic characterization results carried out with small round timber (diameter under 23 cm) of laricio pine (Pinus nigra subsp. Saltzmannii) from Cuenca forest. According to EN 14251:2003 445 small round timber of 8, 10, 12 y 14 cm are tested, concluding they can be assigned to C14 strength class (according to UNE-EN 338:2003). The suitability of ultrasound transmission method to grade this material is evaluated, proposing several strength grades combination (C22/C16/R, C18/C14/R ó C18/R) which are based on values of the indicating property of the ultrasound wave velocity. For each strength classes combination obtained, the grade yield is analyzed and compared with optimal ranking results developed according to UNE-EN 14081-2:2005. Finally, method feasibility related to predict the presence of growth specific singularities (juvenile wood specially) is concluded, in addition to the convenience to establish mix grading methods based on ultrasound and visual evaluation together.
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