Análise de propriedades mecânicas de mistura asfáltica usando ligante modificado por via seca com resíduo industrial e escória de cobre pós-jateada

Abstract

The numerous industrial processes currently generate different residues, and the accumulation of these motivates researchers to study their use in the development of new technologies and in the minimization of impact on the environment. In this way, researchers have carried out studies with the use of waste in the development of new materials and, consequently, have achieved satisfactory results. With regard to road pavement engineering, the increase in traffic density and adverse weather conditions have led to the development of new construction technologies and the use of new materials. These are present in the constituent layers of the pavement, in the modification of the asphalt binder and in the composition of the stone aggregates of asphalt concrete covering the flexible pavement. The use of solid waste has been studied as binder modifiers and as a fine aggregate in asphalt concrete with the aim of increasing its performance in terms of resilience, resistance to permanent deformation and premature aging, contributing to increase the useful life of the pavement. In this context, this study aimed to evaluate the mechanical behavior of asphalt concrete with modified CAP 50/70 binder, by dry process, with 10% m/m of oily sludge masterbatch and tire rubber, in the proportion 15/85% m /m, having as a fine aggregate post-blasted copper slag. For this, the analysis of Marshall stability, tensile strength by diametral compression, modulus of resilience and Cantabro abrasion resistance were performed. The results of the analysis of Marshall stability and tensile strength by diametrical compression of asphalt concrete with binder modified with industrial waste, containing copper slag as fine stone aggregate, were higher than the minimum limit recommended by the norm. The resilience modulus was 23.73% lower than that of the CAP 50/70 asphalt concrete, which can be improved by increasing the concentration of tire rubber in the masterbatch. Despite this, the results of the mechanical properties analyzed indicate the feasibility of using the industrial waste under study in the composition of asphalt concrete for road pavement, with the advantage of the process of modifying the asphalt binder by dry process. In addition, when comparing this process to the modification of the binder by wet method, it can be seen that it prevents the early aging of the asphalt binder, due to the long exposure to heat.