Abstract
ABSTRACT In the production of glue-laminated timber (GLT), boards derived from planted forest wood with easy workability are glued on top of one another. The main objective of the present work was to evaluate the performance of parica timber GLT beams (5 × 10 cm) on GLT. Three procedures were performed: (1) GLT beams (5 × 10 cm) were produced using natural lamellae without chemical preservatives; (2) the individual lamellae (2.5 × 5 cm) were chemically treated, and then glued together; and (3) the beams formed from the glued natural lamellae (5 × 10 cm) were treated chemically. The positions of lamellae on the beams were determined by their modulus of elasticity values (MOE), which were estimated by a non-destructive bending test with a three-point load. The analytical bends, determined by the homogenized section method, and the experimental bends, measured by the four-point bending test, were compared. The differences between the bends were statistically evaluated, and it was found that the experimental bend (21.65 mm) was less than the analytical bend (34.02 mm). There was no significant loss of shear strength or MOE. The axial strength of the chemically untreated beams (49.18 MPa) was significantly higher than that of the untreated beams fabricated from natural lamellae (40.48 MPa). The results indicate that the gluing of treated lamellae does not affect beam performance.
Highlights
Cultivation of planted forests with exotic tree species is very common in Brazil
The lamellae used for the manufacture of the glue-laminated timber (GLT) beams were obtained from the boards of sawn timber, which had their dimensions reduced by a circular saw to 6.0 × 2.5 × 250.0 cm
We concluded that the simplified methodology for non-destructive lamellae classification for GLT beam composition can be applied when more sophisticated equipment is not available
Summary
Cultivation of planted forests with exotic tree species is very common in Brazil. In the Amazon, there is still no tradition of native or exotic species plantation; plantation forests have become a viable solution for the economic recovery of degraded areas with rapid-growth species. Paricá wood allows easy bark removal, lamination, drying, pressing, and excellent finishing; it has low natural durability and is susceptible to the attack by xylophagous organisms. For these reasons, Terezo & Szücs (2010) reported that preservation treatment is necessary for using this wood as a non-temporary element
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