Resistência ao cisalhamento do Eucalipto grandis com a utilização de adesivos à base de resina menanina e uréia e à base de emulsão acrílica polimerizada com isocianato.

Abstract

This work has as objective the investigation of shear strength of two variations of wood glue, new in the market, in order to use them in a constructive process denominated Laminated Wood - GLULAM. Such process is usually used for obtaining parts for large spans. Therefore, it is believed add value and utility to the professionals and companies of construction industry that uses wood as raw material in their projects, to structural purposes. This study developed was started in agree with the recommendations of the brazilian standards NBR 7190/97 “Wood structural project” (Projeto de estruturas de madeira) through the production of a Eucalyptus Grandis (Eucalyptus Grandys) specimen manufactured and subsequently tested for the determination of shear strength, dry and saturated. The investigated glues are commercial adhesives, as the first basis of Urea Melamine Resin and the second, and the second basis of Polymerised Acrylic Emulsion with Isocyanate. Subsequent to the experimental tests and their respective results, a data analysis was performed with the purpose of comparing the performance of the specimens with, and without adhesives. Through the analysis, it was concluded that the adhesives do not present satisfactory efficiency, since they presented significant loss of resistance, especially in case of saturation, when compared to the results of massive eucalyptus specimens.