Navegando por Assunto "Adesivos"

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Acesso aberto (Open Access)
Aplicação de madeiras amazônicas em elementos de madeira lamelada colada (MLC)
(Universidade Federal do Pará, 2023-03-16) NEVES, Paulo Henrique Lobo; MOUTINHO, Victor Hugo Pereira; http://lattes.cnpq.br/8464600937488553; MACEDO, Alcebíades Negrão; http://lattes.cnpq.br/8313864897400179
Timber is considered on the world stage as the primary building material of the 21st century. However, for this potential to be actualized, technologies for unfolding and using the raw material, such as Glued Laminated Timber (glulam), need to be disseminated and used in a wider range of species. In this regard, we emphasize that, despite the great existing diversity, only some studies are found to verify the potential use of Amazonian timber in glulam. This way, this paper aims to analyze the gluing of ten species native to the Amazon, namely: Jacaranda sp., Simarouba amara Aubl., Astronomium lecointei, Couratari sp., Cedrela fissilis., Cordia Goeldiana Huber, Hymenaea courbaril., Dipteryx odorata. Euxylophora paraensis., Mezilaurus itauba., and the combination with four different types of adhesives, two structural resistant to moisture and two non-structural, using a shear sample of solid timber as a evidence, with a minimum of 20 repetitions per treatment. Complementary tests such as delamination and static bending were carried out. We verified that for some species there was an adhesive with statistically equal and superior resistance in some combinations compared to the control sample, demonstrating that the studied species have the potential for the production of glulam, as well as for other products that use adhesives.
Acesso aberto (Open Access)
Colagem de junta de madeira com adesivo epóxi
(Universidade Federal do Pará, 2010-02-08) CARNEIRO, Ruth Pereira; FUJIYAMA, Roberto Tetsuo; http://lattes.cnpq.br/3165747089941318
This work has as objective of making, to test and to compare the glued joints of butt, scarf and finger with three species of wood of different densities. The collage of the wood makes possible the use of pieces and surpluses of wood that are usually discarded, could minimize the cut of a lot of trees, be of the nature or of planned planting. The methodology of production of the joint, it was established with base in indications described in Brazilian norms. Macroscopic observation of the wood it was accomplished, for confirmation of your species. After established the dimension of the joints they were made bodies of proof, using the adhesive Compound Adhesive of epoxy base and wood Angelim-pedra, Jatobá and Tauari, acquired in wood deposit in the city of Ananindeua-Pa. With relationship the characterization of the adhesive, it was verified through the traction tests that has good mechanical resistance. After collages of the joints it was accomplished traction tests to determining the resistance of the glued joints. The glued joints performance it was evaluated in function of the relationship among the values of resistance to traction of the solid wood and the values of resistance to traction with glued wood and rupture way. In agreement with the results it was observed that the glued joints scarf they presented excellent resistance to traction, very close of the resistance of the solid wood; it was also noticed the good acceptance of collage of the wood Jatobá. With relationship the quality of the adhesion, the glued joints of butt and finger, therefore they presented adhesive rupture. The experimental results obtained indicate a good agreement among the theoretical models to evaluate the resistance to the traction and the qualification of the glued joints.