Aproveitamento do resíduo de beneficiamento de rochas ornamentais e de escória moída de aciaria como fíler em pavimentos de concreto asfáltico

Abstract

The State of the Espírito Santo has the most complex pelletizing iron ore in the world and it is the largest producer of steel plates. It is also the largest exporter of marble and granite in Latin America. The state leads the national extraction of ornamental marble and granite, accounting for 39% of Brazilian exports of ornamental and for 50% of marble slabs benefited. In contrast, the state produces a large volume of industrial wastes such as steel slag and waste processing of ornamental stones. Many scientific papers have studied ways to employ these residues in roadways. Given the above, this paper aims to contribute to this issue by assessing the mechanical behavior and the adhesion properties of asphalt concrete produced with the incorporation of Waste Processing Ornamental Rocks (RBRO) and Crushed Slag Steelmaking (EMA) as fillers. A total of 11 blends were studied, varying the proportion and type of residue added. By the Marshall Design method, it was determined the binder content of the mixtures in study. For mechanical characterization of the mixtures, it was performed Marshall stability tests and creep and indirect tensile strength by diametral compression. The adhesion properties of asphalt mixtures were evaluated by wear Cantabria and moisture induced damage (Modified Lottman test). The results showed that the addition of residues in asphalt concrete keeps both the volumetric and mechanical parameters, since the mixtures using industrial waste practically did not change those parameters compared to the reference mixture and also they meet the requirements of current specifications of DNIT. Therefore, it was concluded that the use of industrial waste in asphalt mixtures can be a promising alternative for reuse of the studied residues.