Resíduos de vidro como substituto do agregado miúdo em misturas asfálticas usinadas a quente

Abstract

Asphalt paving is a technique involving the creation of asphalt mixtures composed of asphalt binder and natural aggregates. In this context, there is a constant need to exploit these natural resources for road paving and maintenance. Therefore, studies that seek alternative materials to replace aggregates are useful. One such material is glass, which in Brazil has low recycling rates and is primarily disposed of in landfills. Thus, this study aimed to investigate the replacement of sand with glass powder in hotmix asphalt at proportions of 20%, 50%, and 100%. The methodology involved testing to characterize the aggregates and glass powder, as well as conducting Marshall stability tests and tensile strength tests to evaluate the mechanical behavior of the asphalt mixtures. The results of the granulometric analysis of sand and glass powder showed that both materials have similar granulometric curves. Consequently, this finding indicated that there were no significant changes for the working range used in this research, Range C. Regarding mechanical behavior, all studied proportions yielded results above the minimum defined by DNIT Standard 031/2006. Specifically, the proportion with 50% sand replacement with glass powder met both mechanical and volumetric parameters, demonstrating it as the most suitable option for replacement. Therefore, it is understood that replacing natural aggregate with glass powder is a viable solution for use in asphalt mixtures and provides a sustainable way to reduce natural aggregate exploitation while giving an additional use to glass