Utilização do rejeito de minério de ferro pa ra produção de misturas asfálticas coloridas.

Abstract

The phenomenon Ilha de Calor Urbano (ICU), with a consequent increase in temperatures i n urban areas, has some consequences that can bring about an increase in the consumption of energy, the concentration of atmospheric pollutants, and even a worsening of the health of groups of people sensitive to climatic changes. In this way, new alternatives arise with t he objetive of reducing the effects of the ICU phenomenon, using materials that show a lig hter coloring, reducing the heat absorbed by these surfaces, as well as the external temperat ure of the area.There are materials that have the potential to be used as colorants in asphalt mixtures, one of them being the waste of iron ore. The mining industry stands out for its gr owth, producing millions of tons of ore waste annually, which is discarded irregularly in th e wild, or stored in containment structures called tailings dams. Therefore, the present stud y aimed to analyze the influence of the use of iron ore waste for the production of colored a sphalt mixtures.To do so, the substitution of 7.5%, 10% and 12.5% of stone powder by iron ore waste in the composition of asphalt mixtures was carried out, produced with variation i n machining temperatures (157°C, 165°C and 173°C), starting from an experimental factor ial planning. Tensile strength (RT), resilience module (MR.), fatigue, cancer, Lottman and Flow Number tests were performed. Shortly afterwards, plates were made, with dimension s of 40x20cm and height of 4cm, of the samples without waste and with contents of 7.5%, 10% and 12.5%. In this stage, the external surface temperature and the reflectance measure ment were measured.Accordingly, the results obtained from the mechanical and thermal ch aracterization indicate the technical feasibility of incorporating the iron ore waste into asph alt mixtures, in the proportion of 12.5% of waste, with an increase in reflectance of 40.25% and a reduction of 2.38°C in the external temperature. Thus, presenting more satisfactory mechanical and thermal results.