Desenvolvimento de painéis sanduíche com núcleo leve com caroço de açaí e laminados reforçados com fibras de juta

Abstract

In the present study, the development and mechanical characterization of a sandwich panel composed of a lightweight concrete core with açaí seed and another by expanded polystyrene, with faces of cementitious composites reinforced with long jute fibers were carried out. In the production of the core, three types of traces were studied with two types of different aggregates (expanded polystyrene and açaí seed), the açaí seed (natural aggregate) was chosen aiming the reduction of the residue generation and increase of the added value of this material. The core was analyzed for resistance range, type of treatment used in the natural aggregate and density. The faces were produced with 6% content of long jute fibers, aligned unidirectionally and distributed in 3 layers, forming a laminate. The laminates and the sandwich panel were analyzed by four-point bending tests. The treatment combined with saturation in the natural aggregate added to the strength in the core composite and the treatment with paraffin or resin reduced the water absorption about 36%, it was observed that the density of the core influenced the compressive strength. The average of tensile stress of the laminates was 27,7 MPa with an maximun deflection of 5,10 mm. The sandwich panel ruptured by bending of the lower face and the maximum rupture load was 3,67 KN. With the present results were observed advantages of using the sandwich-panel element in the construction system and the use of the natural aggregate in the core from both a mechanical and an environmental point of view were observed.