Influência de aditivo na produção de compósitos de matriz gesso com fibra de coco verde

Abstract

The development of composite materials with natural fibers has been growing along with man's need to find renewable and low-cost resources for the production of new materials, such as gypsum-green coconut fiber matrix composites. The problem with this study is that green coconut waste generates numerous environmental problems. In this study, composites made of gypsum matrix with recycled green coconut fiber were produced in percentages of 5%, 10% and 20% fiber. The effect of the Bianco additive on the processing of the gypsum matrix and the composites was evaluated. It can be concluded that the additive increased the workability of the matrix and the composites, since it increased the setting time of the gypsum and facilitated the manual processing of the specimens. The additive used reduced the compressive strength of the gypsum matrix. Incorporating the fibers into the gypsum matrix reduced the density of the composites, which is explained by the low density of the green coconut fibers. The maximum compressive strength (MPa) of the composites with 5% and 10% fiber was lower than the pure and additive gypsum matrices, concluding that the coconut fiber did not reinforce the matrix. The composites of pure gypsum matrix and gypsum added with 20% fiber showed an increase in mechanical strength compared to the composites with 10% fiber, which led to the need to repeat the production of the composites with 20% fiber, which had a high content of fiber incorporated into the matrix, making it difficult to distribute and disperse the coconut fibers.