Análise comparativa de mistura asfáltica convencional e mistura asfalto borracha

Abstract

This study addresses the accelerated degradation of the Brazilian road network due to increased cargo traffic and severe weather conditions, proposing the use of modified asphalts as an alternative to extend pavement durability. The primary objective is to conduct a comparative analysis between a conventional asphalt mixture and a tire-rubber modified mixture (wet process, terminal blending type), evaluating their volumetric and mechanical behavior through laboratory tests. The methodology employed Marshall dosage to determine the optimal design binder content for both mixtures, using basaltic aggregates and AB-8 modified binder. Tests included aggregate characterization, particle size analysis (DNIT Range C), stability, flow, and tensile strength. he results demonstrated that the asphalt-rubber mixture presented an "optimal" binder content superior to that of the conventional mixture. This increase is justified by the higher viscosity of the modified binder and the need for a thicker film to coat the aggregates. Notably, the modified mixture achieved superior tensile strength and a higher capacity for elastic deformation (flow) without loss of internal cohesion. It is concluded that the use of asphalt-rubber binder is technically viable and advantageous, providing gains in mechanical performance and environmental sustainability through the final disposal of waste tires.