Pressured recycled gypsum plaster and wastes: Characteristics of eco-friendly building components

The objective of this paper is to study some characteristics of a component to buildings made with gypsum plaster (commercial - CGP and recycled - RGP), and wastes (red ceramic - RC and porcelain - PW) by loading-pressure. Bricks were prepared with a solid mass composition containing 50% (by weight) of binder, 50% (by weight) of waste, and very small water/dried powder ratio (0.22). Specimens were molded with uniaxial loading-pressure (10 kN) before setting times. Compressive and flexural strengths, porosity, and microstructure were evaluated. The compressive results were in the range of 12.3 and 33.9 MPa, higher than the minimum required by Brazilian Standards to building components (≥2.5 MPa). The low water/solid mass ratio and the uniaxial loading-pressure before setting times contribute to decreasing the porosity, which was shown in the dense microstructure. The obtained results show that these components present a good quality building component.