ABSTRACT The objective of this study was to determine the adhesion quality of Pinus sp. wood glued joints by means of tensile strength, shear strength before and after exposure to weathering simulated conditions, and delamination tests. Wood glued joints were bonded with three adhesives: resorcinol, resorcinol-tannin (90:10) and resorcinol-tannin (80:20) at 25 and 60 °C with 0 and 10% methanol contents. Treatments presented restriction for tensile strength. All adhesives showed good results at 25 °C. The resorcinol-tannin (90:10) adhesive lost strength at 60 °C. Methanol improved the adhesion quality for all adhesives at 60 °C.

RESUMO O objetivo deste estudo foi avaliar a qualidade e a resistência de juntas de madeira de Pinus sp. coladas através de testes de tração, cisalhamento antes e após condições simuladas de serviço externo e testes de delaminação. As juntas foram coladas com três adesivos: resorcinol, resorcinol-tanino (90:10) e resorcinol-tanino (80:20) a temperaturas de 25 e 60 °C, com 0 e 10% de metanol. Os tratamentos apresentaram restrições quanto à tração normal. A colagem a 25 °C apresentou bons resultados para todos os adesivos. A colagem a 60 °C diminuiu a resistência do adesivo resorcinol-tanino (90:10). O metanol melhorou a qualidade de adesão de todos os adesivos a 60 °C.

Abstract The objective of this study was to determine the adhesion quality of quaruba cedar wood glued joints by means of tensile strength, shear strength before and after exposure to weathering simulated conditions, and delamination tests. Wood glued joints were bonded with three adhesives: resorcinol, resorcinol-tannin (90:10) and resorcinol-tannin (80:20) at 25 and 600C curing temperatures with 0 and 10 % methanol contents. Wood glued joints bonded with resorcinol adhesive at 250C without methanol presented high tensile strength, with values similar to solid wood. Wood glued joints bonded at 250C presented the highest shear strength values even after the exposition to weathering simulated conditions.