Compósitos à base de gesso reforçados com partículas de resíduos lignocelulósicos e embalagens cartonadas

Abstract

The aim of this project was to develop and characterize composites made from plaster reinforced with particles of sugarcane bagasse, Pinus, Eucalyptus and crushed carton packages. For the production of the composites we used fine casting plaster, carton package wastes and particles of Pinus oocarpa, Eucalyptus grandis and sugarcane bagasse. The following proportions were used in order to incorporate reinforcements as substitutes for the plaster: 0%, 7.5%, 15%, 22.5% and 30%. The water/gypsum ratio was determined according to standard EN 13279-2:2004. The samples (three replicates per treatment) were made using wooden formers whose physical and mechanical dimensions were 40 x 40 x 160 mm. The dimensions used for the thermal test were 20 x 20 x 2mm. Due to the different reinforcements there was an increase of moisture and water absorption, whereas there was a decrease of seeming density, flexural strength, compressive strength, compression stiffness and thermal conductivity. All materials met the standard for flexural strength. All Pinus and Eucalyptus incorporations met the standard for compressive strength. On the other hand, reinforcements of sugarcane bagasse and carton packaging follow the standard for compression with maximum reinforcement insertion of 28.06% and 24.3%, respectively. The materials that presented better performance as reinforcement of plaster composites were the particles of Pinus and Eucalyptus.