Caracterização de compostos de cimento Portland confeccionados com resíduos do processamento a úmido de rochas ornamentais de origens distintas

Abstract

The mining and processing of ornamental stones has significant production in the Brazilian context, due to the various applications of these materials in construction. In urban centers, several processing stages of theses rocks promote the generation of solid waste: it is estimated that 20% to 30% of the processed material is discarded as waste. Literature studies show the possibility of incorporating these waste in construction materials. However, a difficulty in the recycling of this waste is the heterogeneity of its composition. This heterogeneity is even greater in the waste generated by the cutting and polishing with water use. These processes generate an abrasive slurry composed of various types of waste rocks and other materials. In this context, the aim of this research is to characterize cement Portland compounds made with this abrasive slurry from different sources, in order to evaluate the influence of heterogeneity of waste on the performance of these compounds. It was studied comparatively compound with and without waste in replacement of 20% of Portland cement. The residues were collected in different seasons and marble shops in the city of Belo Horizonte, MG. After waste characterization, it was evaluated the performance of pastes and mortars in fresh and hardened state. The results indicated that the use of waste as a substitute for 20% of Portland cement makes the compound more susceptible to carbonation, less resistant to compressive stress, and did not affect the properties of fresh mortar, as well as electrical resistivity and absorption of water by immersion and capillary action.