Comparação de métodos de colagem para madeira de Pinus sp.

Abstract

The population growth, especially in urban areas, has increased the demand for housing, boosting the construction sector, increasing the demand for quality and sustainable raw materials. The purpose of this work was to characterize the shear strength of the glued laminated wood beams glue and to evaluate possible differences between two methods of applying adhesive, by brush or paint roller. The adhesive used was melamine urea-formaldehyde (MUF) and the determination of shear strength followed by NBR7190. The samples for evaluation of the glue line were divided into two groups, a dry treatment and a humid treatment, immersion of the test specimens for 24 hours in water, and then tested in a universal testing machine. The average resistance presented after the test of the test pieces in equilibrium moisture was 9.9 MPa, with no statistical differences, but after the immersion treatment in water the values found were 6.0 and 7.9 MPa for Paint roller and brush, respectively, with statistical difference proved by the Tukey test at 95% probability.