EUCALYPTUS GLUED-LAMINATED WOOD PERFORMANCE
Name: RAFAEL GONÇALVES ESPOSITO DE OLIVEIRA
Publication date: 27/02/2018
Advisor:
Name |
Role |
|---|---|
| FABRICIO GOMES GONÇALVES | Advisor * |
Examining board:
| Name |
Role |
|---|---|
| FABRICIO GOMES GONÇALVES | Advisor * |
| MACKSUEL SOARES DE AZEVEDO | External Examiner * |
| MICHEL PICANÇO OLIVEIRA | External Examiner * |
| PEDRO GUTEMBERG DE ALCÂNTARA SEGUNDINHO | Co advisor * |
Summary: The objectives of this work were to produce bonded laminated wood (MLC) elements from the wood of Eucalyptus grandis x E. urophylla clones and to evaluate their behavior when submitted to the normal compression stress to the fibers. For the production of bonded laminated wood (MLC), the wood was classified based on the apparent density of the boards, in two groups (1: <0.587 g / cm3, 2: ≥ 0.587 g / cm3). The MLC elements were glued with two adhesives, resorcinol-formaldehyde, "Cascophen", and another, a bi-component, castor-based polyurethane adhesive. The moisture content of the boards, the apparent density and the shrinkability, and mechanical tests of normal compression to the fibers, parallel shear to the fibers, shear in the glue line and delamination were determined. For anatomical characterization and collage quality evaluation, histological slides were prepared to visualize the anatomical elements of the species and to measure the glue line. It was observed that the evaluated wood presented satisfactory results to be used in the manufacture of MLC, especially in those boards of higher apparent density and bonded with the resorcinol-formaldehyde adhesive, with higher values for the mechanical stresses evaluated. The higher density boards presented vessels with larger diameters, high and wide radii, making the structure propitious for mobility and penetration of the adhesive. The density showed a correlation with the mechanical properties, the thickness of the main glue line showed correlation with the adhesive and with the percentage of failure in the wood, the adhesive also presented correlation with the percentage of wood failure. The normal fiber compression showed a correlation with the shearings parallel to the fibers and in the glue line. The latter showed a correlation with the apparent density, adhesive, secondary glue line and vessel diameter. The shear parallel to the fibers showed a correlation with the shear strength in the glue line and the vessel diameters. The height and width of the rays had a correlation with the number of cells.
Keywords: technological characterization, adhesives, structural element, normal fiber compression.
