Microesferas produzidas a partir da cinza da casca do arroz para aplicação na sinalização viária horizontal

Abstract

Road signs correspond to an essential tool on highways, as they allow visualization in adverse weather and lighting conditions. In this sense, in order to have na improvement in visibility, it is essential that the demarcations must be retroreflective. Retroreflectivity in road markings occurs when solid glass microspheres are added to horizontal road marking paints. Among the different types, type I-B microspheres, according to the NBR 16184:2021 standard, have an average diameter of around 150 μm and are mixed with the paint before application. According to NBR 16184:2021, the microspheres must be clean, clear and colorless for use in road signs. These microspheres are usually manufactured with recycled sodic-calcium glass. On the other hand, glass made from rice husk ash (RHA) has been produced at unipampa, campus Alegrete, since this material has a high percentage of silicone dioxide, the main constituent material in glass. Therefore, this work aims at the production of microspheres produced with CCA in the composition and also sand in the composition. A comparative study was carried out for these two compositions (sand or ash) in terms of morphology, granulometry and retroreflectivity measurements, also considering current regulations. The results showed that both samples are in accordance with the regulations. More than that, the microspheres produced from rice husk ash can be used in horizontal road signs, giving na adequate end to this industrial waste, helping to close the rice production cycle.