Estudo da viabilidade do uso da especie Eucalyptus dunnii (Maid) na manufaturade paineis de madeira cimento
Latorraca, João Vicente de Figueiredo
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SubjectChapa de particulas
Chapa de madeira aglomerada
The main objective of this dissertation is to assess the technical feasibility of the production of mineral boards, through the utilization of Eucalyptus dunnii flake particles of five (5) trees from a plantation located in The Municipal District of Colombo, State of Parana, as well as to value the particles treatments efficiency, the influence of the wood: cement ratio variation and the use of chemical additive. Used cement was commercialy available Portland type. Three particles treatments were analized: (1) particles without treatment; (2) particles treated with hot water for 1 hour at 80 °C; and (3) particles treated with NaOH 1% for 24 hours; with two wood:cement ratios (1:2.5 and 1:3.0) and two chemical additives (CaC12 and MgC12) effects over physical and mechanical properties of pannels. Chemical analysis of samples of all treatments were performed to verify their efficiency. Twelve treatments were generated from the interaction of above mentioned variables, in five panel repetitions which produced a total of sixty (60) paneis. The assessed physical and mechanical properties were: (1) static bending (ME and MR); (2) parailel compression; (3) internal bonding; and (4) dimensional stability (water absorption and thickness swelling after immersion in water). The results were statistically analyzed through factorial analysis of covariance. According to the results of chemical analysis the treatments did not attained their major objectives, which were to reduce the amount of wood extractives, Among the three analyzed factors, particles,. treatments caused a more pronounced effect on the panels properties, with negative contribution in the results. The increment of the wood:cement rate did not showed higher average values for the mechanical properties, except in intemal bonding. In general, MgCl2 was the chemical additive with better performance. The factors interactions showed different influence on the mechanical properties, but analogous influence on the dimensional properties. The combination between wood:cement ratio and chemical additive showed greater influence on MR (Rupture Modulus) and internal bonding . The combinations between particles treatments and chemical additive, particles treatments and wood:cement ratio, showed respectively major influence on ME (Elasticity Modulus) and paraliel compression. Particles treatments and wood:cement ratio interaction affected physical properties in greater degree.
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