Characterization of granite mining waste for geotechnical purposes

Waste generation is part of any production process. Among productive sectors, the mining industry stands out in environmentally sustainable models due to the large volume of waste produced. Crystalline rocks, particularly granites, are highlighted due to their high mechanical strength and esthetic characteristics. The aim of this study was to perform a geological/geotechnical characterization of granite mining waste for geotechnical purposes. Samples of granite mining waste were collected at different waste disposal points. The following characterizations were performed: physical (apparent specific gravity, apparent absorption and apparent porosity), optical and scanning electron microscopy and mechanical characterization (uniaxial compressive strength test). All the samples analyzed exhibited physical indices and average values compatible with those recommended by international standards. Textural aspects, such as random muscovite concentration, forming aggregates, can explain the mechanical behaviour of the samples. In addition, based on the results obtained, the waste collected can be used in the riprap of hydraulic and construction projects that cross water courses and roadways.