Avaliação das propriedades mecânicas da resina epóxi com adição de serragem

Abstract

This study evaluated the mechanical properties of epoxy resin-based composites with the addition of wood sawdust, aiming to promote the sustainable use of solid waste in civil construction. Test specimens were fabricated with varying sawdust contents (0%, 5%, 7.5%, 10%, and 20%) mixed into the epoxy matrix, in accordance with ASTM D1708-13. Tensile tests were conducted to determine key parameters such as elastic modulus, maximum stress, strain at rupture, and yield strength. Results showed that adding up to 7.5% sawdust increased the elastic modulus (stiffness) without significantly compromising mechanical strength. However, higher contents (10% and 20%) led to a sharp reduction in strength and ductility, indicating matrix embrittlement due to poor particle dispersion and void formation. The 7.5% formulation achieved the best balance between structural performance and sustainability, making it suitable for non-structural applications such as coatings, panels, and decorative components, in accordance with ABNT NBR 15575. This research contributes alternatives for the reuse of lignocellulosic waste, reinforcing the technical and environmental potential of sawdust as a filler in composite materials.