Study of adhesion time, temperature and gluing pressure on shear strength of Eucalyptus grandis wood glued with adhesive solvent free / Estudo do tempo de adesão, da temperatura e da pressão de colagem na tensão limite de cisalhamento de uniões de madeira de Eucalyptus grandis coladas com adesivo sem solvente

AUTOR(ES)
DATA DE PUBLICAÇÃO

2007

RESUMO

The use of glu-lam is a viable alternative for exploitation of all wood potential presenting a series of advantages. The linking between layers however has a basic paper in glu-lam good quality. Therefore for a good performance of glu-lam structures it is fundamental the choice of an adhesive which has a great mechanics resistance and also resistance to the weather action. The adhesives usually used having high cost, that arrives 60% of glu-lam total cost beyond contain solvent that are harmful to health, having dark coloration what changes the wood natural color. Low cost is primordial to become this material more viable and competitive if compared with another materials. Thus, this search had as objective to verify the load capacity applied in the samples in shear strength test right in the glued surface and also contributing for efficiency improvement of beam-glu-lam. The glue used to prepare the samples was free of solvent. It were verified the effect of gluing pressure (1,25; 2,50 e 5,00 MPa), temperature (27, 60 e 90°C) and the adhesive time of cure (7 and 10 days)in the shear strength. The adhesive dose applied in the layers was 200g/cm2.In a second research step it were obtained the specific gravity and moisture content from the samples which were already tested to explain the variability that was observed. It was utilized Eucalyptus grandis wood for being a specie of enormous potential for multi purpose and because its physical and mechanical properties make it. Highest values of shear strength were obtained at the temperature of 90°C. The glue pressure and the adhesive curing time have no relevant influence on this important mechanical properties.

ASSUNTO(S)

laminados ensaios de cisalhamento eucalipto adhesion eucalyptus temperatura colas e adesivos glu-lam madeira shear strength adhesive wood

ACESSO AO ARTIGO

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