Avaliação da influência do grau de ativação do ligante asfáltico nas propriedades do agregado fresado

Abstract

The reuse of residues in the pavement industry has became attractive over the last decades, mainly due to the idea of sustainability that gains even more prominence in today's society, besides the reduction of natural resources and costs in the preparation of asphalt mixtures. Given this scenario the reclaimed asphalt (RA), the main pavement residue, it has become the object of study in search of the perception of the influence of its incorporation in recycled asphalt mixtures for application in layers of floor coverings. Despite being a waste made of materials after the pavement restoration process, aggregate and binder aged, there are still issues that make it difficult to add material and its understanding as a constituent of the compound to be formed, such as: heterogeneity, storage conditions, lack of mapping of the source of the material beyond the concepts inherent to the object itself that were not completely understood by the scientific community as the degree of binder activation and cluster formation process. Through the selected variables still unknown for the characterization of the material with a view to its properties as an aggregate, it shows the extreme importance in understanding how changes in aggregate characteristics occur, seen here based on particle size and shape. On the shape forms, analysed by Digital Image Processing (PDI), in front of variables that influence the aged binder activation, such as temperature, mixing time and abrasion. To evaluate how changes in RA aggregates properties in this study, use mix samples that occur before the binder addition with the aid of micro-deval as a simulator by changing variations in mixing time and temperature. Given the applied methodology, if there is material below the maximum limit adopted in the process, which may be related to influences of abrasion and break up of clusters, as well as shape properties such as surface texture and angularity suffered by use of the applied temperature. Therefore, it was verified that the RA aggregate properties were influenced by the analysed variables. However, future studies should perform the best way to better assess and understand these relationships between the variables that influence the binder activation, as the changes in the RA aggregate.