Abstract
This research aimed to evaluate the effects of different adhesives, amounts of glue, and pressing time on the mechanical properties of glued laminated beams (glulam) made of Tectona grandis wood. The beams were produced with 5 battens: two of dynamic modulus of elasticity, class 1 - MOEd C1, on the faces; and three of class 2 - MOEd C2, in the core. Gluing was performed with the use of resorcinol-phenol-formaldehyde (RPF) adhesive at the amounts of 350 and 450 g.m - 2 and pressing time of 5 and 8 hours; and emulsion polymer isocyanate (EPI) adhesive at the amounts of 180 and 220 g.m - 2 and pressing time of 3 and 4 hours. The results of the mechanical properties of beams did not show a clear relationship of the effects of the studied variables on the evaluated properties of static bending. The beams glued with RFF adhesive presented higher resistance of the glue line compared with the beams glued with EPI adhesive.
Highlights
A teca (Tectona grandis) é uma espécie com ocorrência natural no subcontinente índico e no sudeste asiático
The beams were produced with 5 battens: two of dynamic modulus of elasticity, class 1 – módulo de elasticidade dinâmico (MOEd) C1, on the faces; and three of class 2 – MOEd C2, in the core
Gluing was performed with the use of resorcinol-phenol-formaldehyde (RPF) adhesive at the amounts of 350 and 450 g.m–2 and pressing time of 5 and 8 hours; and emulsion polymer isocyanate (EPI) adhesive at the amounts of 180 and 220 g.m–2 and pressing time of 3 and 4 hours
Summary
A teca (Tectona grandis) é uma espécie com ocorrência natural no subcontinente índico e no sudeste asiático. Matos (1997) utilizou lâminas de Pinus taeda classificadas em classes de MOEd para produção de painéis de lâminas paralelas e obteve aumentos significativos nos resultados de MOE e de MOR, com a colagem de lâminas de classes superiores nas faces dos painéis. Pio (2002) utilizou lâminas de Eucalyputs grandis classificadas com a aplicação de ondas de tensão e obteve painéis de maior resistência à flexão estática com lâminas de classes superiores de MOEd nas faces dos painéis de lâminas paralelas. Este trabalho teve como objetivo avaliar a massa específica aparente da madeira e a influência de dois diferentes tipos de adesivos, gramaturas e tempo de prensagem nas propriedades mecânicas de vigas de madeira laminada colada de teca (Tectona grandis)
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