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The objective of this study was to produce and evaluate physically and mechanically composites of plaster-wood and cement-wood using particles of Eucalyptus grandis, in order to analyze the possible replacement of the cement by the gypsum as a binder, in order to reduce the cure time. The panels were produced in metal molds with dimensions of 25 x 25 x 1,5 cm (LxLxA), nominal density of 1,2 g. cm-3 and a ratio of 1:2,75 (wood: plaster) and water-plaster of 1:0,4. Reference panels were produced using the CP V-ARI Portland cement as a binder. Calcium chloride (CaCl2) was used as the catalyst to accelerate hydration. The results indicated that the panels did not show significant statistical differences in density, water absorption and swelling in thickness both after 2 and 24h of immersion in water, modulus of elasticity for flexion and parallel compression. The cement-wood panels obtained higher values in moisture retention, modulus of rupture for static bending test and internal bonding. These results demonstrate that the use of gypsum as a binder may be feasible and further studies on the loss of mechanical resistance of gypsum in contact with moisture are required.

Compósitos à base de cimento e gesso reforçados com partículas de madeira de Eucalyptus grandis