Adaptação de usina para reciclagem à quente e avaliação laboratorial das misturas asfálticas produzidas

Abstract

Brazilian asphalt pavements have suffered over the years, with the increasing volume of traffic, structural and functional deficiencies requiring continuous maintenance, affecting, also, the comfort and safety of users. In this sense, solutions to the correction of this problem are necessary and the hot recycling of asphalt mixtures appears as a viable alternative from the technical, environmental point of view and the reduction of costs. In this way, this research sought to elaborate projects containing 10 (M10), 20 (M20) and 30% (M30) of milled material (RAP), to implement a volumetric plant to incorporate RAP, to evaluate in the laboratory the mixtures produced in the plant and financial viability. The projects conformed to the recommendations of the DNIT 031/2006 Service Specification, using asphalt binder modified by polymer (60/85), aggregate of granite origin and RAP of basaltic origin with modified asphalt binder modified. The plant was implemented for RAP input directly into the mixer. The technological control after machining showed a behavior with few differences in reference to the initially designed one. The mechanical evaluation was performed through the Modulus of Resilience (MR), Complex Modulus, Tensile Strength (TS), Flow Number (FN) and Traction-Compression Failure tests. In addition, the adhesion/cohesion characteristics were obtained through induced damp damage (IDM) and cantabrian wear. The MR assay demonstrated that there is an increase in stiffness with increased RAP in the blends, but the final binder content found stands out as the decrease in stiffness between M20 and M30 is found. In the Complex Module, by the 2S2P1D modeling, the elastic or viscous behavior cannot be attributed to the percentage of RAP inserted in the mixtures, which was already expected by the low incorporated contents. In RT, an increase in stiffness was observed with increasing percentage of RAP, already in FN, values decreased. In DUI and wear tests there is no specific behavior in accordance with the incorporation of milling, but the recycled mixtures have similar results to the conventional ones. In the fatigue results, M10 was rated as having the best behavior and, at M30, the worst. This analysis continues in the economic feasibility, since the value analyzed during the life of the fatigue found is expressively smaller in M10 compared to the other mixtures, even though the unit cost of M30 is the lowest. The possibility of using the hot recycle is indicated, and the environmental and financial gains associated with the technical quality of the mixtures are observed, taking care of the machining, application and technological control.