Classificação visual e mecânica de madeiras de florestas plantadas: espécie de pinus elliottii conforme NBR 7190/2022

Abstract

This study addressed methods for the visual and mechanical classification of commercial wood from non-homogeneous batch of Pinus elliottii species, intended for structural purposes. The evaluation included assessments of knots, fiber inclination, cracks, warping, twisting, bending, bowing, cupping, presence of fungi and resin pockets, as well as holes caused by xylophagous insects, for visual inspection. Additionally, three-point bending tests and density tests were conducted to assess mechanical properties. The objective of these analyses was to assign a classification to the samples, ensuring compliance with the parameters established in NBR 7190/2022. This provides safety for the construction of wooden structures and encourages further research on the subject with other species of planted or native forests, in line with the criteria of the recent update to the aforementioned norm. The results revealed disparities among the different classification methods, emphasizing the need for comprehensive investigations to achieve greater accuracy in defining the class of the studied structural wood specimens. Keywords: Visual classification; Mechanical classification; Planted forests; NBR 7190/2022; Pinus elliottii.