Gypsum-based composites with addition of woody endocarp of Barueiro nut residue and sawdust

Abstract. The reuse of the waste generated by human activities is an important measure to mitigate the impacts caused by these, becoming indispensable to the improvement of the quality of life of people. The use of fiber and vegetable waste is a good option for obtaining new materials, while employing raw materials that once would have been discarded. The goal with this study assess the physical-mechanical properties of gypsum-based composites with addition of nuts waste of Barueiro (Dipteryx alata) and timber waste, with a view to its possible use in small rural constructions, as a way of minimizing the cost of the work. To determine the influence of incorporation of waste and water/plaster factor on compressive normal stress and apparent density of composites, were incorporated into five different levels of each residue (0.0%, 5.0%, 2.5%, 7.5% and 10.0%), grouped the five plaster/water ratios (0.50, 0.55, 0.60, 0.65 and 0.70). The analysis of the results was carried out through the analysis of variance. The increased water/plaster ratio influenced negatively the normal voltage to both composite compression at the same time that influenced the mass specifies. The added content was more influence on compressive strength with composites with addition of brown residue of Barueiro.