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 paricá 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.
ResumoO presente estudo teve como objetivo determinar a viabilidade técnica da produção de painéis aglomerados de misturas de fibras e maravalhas de Pinus spp por meio das propriedades físicas e mecânicas. A matéria-prima utilizada para a produção dos painéis foi composta por fibras retiradas do processo produtivo de MDF, maravalha coletada no processo de aplainamento da madeira, resina uréia-formaldeído e emulsão de parafina. O delineamento experimental envolveu cinco tratamentos homogêneos nas proporções de: 100 partes de fibras para 0 partes de maravalha (T1), 75:25 (T2), 50:50 (T3), 25:75 (T4) e 0:100 (T5). Foram produzidos três painéis por tratamento com 650 kg.m -3 de massa específica, 12% de resina, 1% de emulsão de parafina e ciclo de prensagem de 40 kg.cm -2 de pressão, 160 o C de temperatura por um tempo de 8 minutos. A determinação da massa específica, absorção de água, inchamento em espessura e tração perpendicular foram realizados de acordo com os procedimentos da ASTM (2006) AbstractThis study aimed to determine the technical feasibility of the production of particleboard from fibers and wood shaving of Pinus spp through physical and mechanical properties. The raw material used for producing panels was composed of fibers taken of the MDF process, wood shaving collected in the flattening process, urea formaldehyde resin and paraffin emulsion. The experiment involved 5 treatment homogeneous in the proportions: 100 parts of fibers to 0 parts of wood shavings (T1), 75:25 (T2), 50:50 (T3), 25:75 (T4) and 0: 100 (T5). 3 panels were produced by treatment with 650 kg.m -3 density, 12% resin, 1% paraffin emulsion and pressure of 140 kg.cm -2 , temperature of 160oC for 8 minutes. The determination of specific gravity, water absorption, and thickness swelling, tension perpendicular to surface were performed according to the procedures of ASTM (2006); the static bending test followed the procedures of DIN (1982) and screw withdrawal resistance the indications of ABNT (2013). With the verification of data normality and homogeneity of variance an analysis of variance was carried out and the Scott-Knott test at 95% probability. The results showed that the average values of dimensional stability of the panels were regular in relation to the reference standards. However, the increased amount of wood shaving in the panels caused a decrease in the mechanical properties, especially the modulus of elasticity in the static bending and in internal adhesion.
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