Comportamento à flexão de painéis sanduiches com faces em compósitos cimentícios reforçados com tecido de juta com quantidades diferentes de camadas

Abstract

The main objective of this research was to analyze the effect of varying the number of reinforcement layers in the flexural behavior of sandwich panels with cementitious composites reinforced with jute fabric and extruded polystyrene (XPS) core with the configuration of parallel grooves. The main characteristic of cementitious matrices is their fragile rupture process, but the mechanical flexural performance has been significantly enhanced with the use of natural fibers. The preference for natural fibers over synthetic ones is due to the fact that the cost and production are reduced. The XPS core reduces the weight of the panel, increases its moment of inertia, and improves thermal insulation. In order to improve the adhesion and prevent lamination between the core and the face, grooves were made in parallel on the core, with a thickness and depth of two millimeters, equally spaced at 20 millimeters, in the fabrics in the weft and warp directions, after analyzing the data it can be inferred that the values of the tests in the warp direction had a similar performance in relation to those of the weft. 5 panels were produced with the same type of core ranging from 1 to 5 layers of reinforcement on the face. The results of the four-point bending tests show that the performance of the sandwich panel is directly affected by the number of reinforcement layers, with its maximum stresses, stiffness and toughness gradually evolving to the panel with four reinforcement layers. The panel with five layers of reinforcement underperformed.