Abstract
ABSTRACT Bamboo is a material used on a global scale in several areas. However, it needs adaptation in the processes for industrial use, in Brazil. The production of glued laminated panels has been growing in the world and this material can be a source of resources for this purpose. This study aimed to evaluate the physical-mechanical properties of laminated bamboo panels produced with two species (Phyllostachys aurea and Dendrocalamus asper) and two production processes/adhesives (glued-laminated bamboo and thermo-mechanical laminated bamboo). For the mechanical properties analysis, specimens removed from the panels were subjected to shear tests, Janka hardness and static bending. The same specimens were used to determine the apparent density, moisture content and degree of compression. The apparent density varied between 0.75 g cm-3 and 0.79 g cm-3, with equilibrium moisture contents between 7.83 % and 10.42 %. The highest values for the mechanical properties were verified in the thermo-mechanical laminated process. For D. asper, the modulus of rupture was 146.8 MPa, the shear glued line 6.36 MPa and the Janka hardness 3,852 N, while, for P. aurea, the modulus of elasticity reached 19,603 MPa. It was concluded that the production of bamboo laminated panels, especially using the thermo-mechanical process, can be a potential alternative.
Highlights
Bamboo, as it is commonly called, consists of libero-woody bundles, that is, an approximately circular structure that encompasses vascular tissues of primary phloem and primary xylem
The mean values of the panel physical and mechanical properties of Phyllostachys aurea and Dendrocalamus asper (Table 3) showed that they presented a small variation in density
There was an average thickness variation of 5.48 % in the thermomechanical laminated bamboo (TMLB) process, which did not provide an increase in the density higher than that verified in the glued-laminated bamboo (GLB)
Summary
As it is commonly called, consists of libero-woody bundles, that is, an approximately circular structure that encompasses vascular tissues of primary phloem (liber) and primary xylem (ligneous). The term ligneous, would not be the most indicated, because the wood only originates from the secondary xylem; it is already of common use for the monocotyledons. Classified as a representative of the Gramineae or Poaceae family, Bambusoideae subfamily, it is estimated the existence of 119 genera, with 1,482 species in the world (Clark et al 2015). In Brazil, there are 258 species, of which 175 are endemic and the others were introduced 2. Universidade Estadual do Centro-Oeste, Departamento de Engenharia Florestal, Irati, PR, Brasil
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