Fibrocimento com resíduos lignocelulósicos encapsulado com copolímero etileno acetato de vinila (EVA)

Abstract

The study investigated the development of fiber,reinforced cement composites produced by extrusion, reinforced with lignocellulosic residues from the species Erythrina poeppigiana (cellulose particles and nanofibrils) and incorporating pulping residues (dregs), with subsequent encapsulation by ethylene,vinyl acetate copolymer (EVA). The objective was to evaluate the physical, mechanical, and microstructural performance of these composites, aiming to increase their durability against weathering and the alkalinity of the cementitious matrix. Properties such as bulk density, porosity, water absorption, modulus of rupture, modulus of elasticity, proportional limit, toughness, and microstructure were analyzed using scanning electron microscopy. The results showed that encapsulation with EVA reduced water absorption by up to 36%, maintained porosity below 28%, and favored the cohesion of the matrix,reinforcement interface. The composite containing nanofibrils and dregs stood out, presenting a modulus of rupture of 8.7 MPa, a modulus of elasticity greater than 4.9 GPa, and an average toughness of 1.08 kJ/m². It is concluded that the use of lignocellulosic waste from Erythrina poeppigiana, associated with encapsulation with EVA, represents a promising strategy for the production of sustainable cementitious materials, contributing to the valorization of residual biomass and to the principles of the circular economy.