Análise comparativa de uma mistura asfáltica ensacada comercial com um pré-misturado a frio e um concreto asfáltico.

Abstract

The increase in the road network around the world, together with the increase in the emission of greenhouse gases that contribute to global warming, has required innovations from the asphalt paving segment in terms of its products. With the requests of the vehicles together with bad weather, the coatings end up showing damages in their extension, giving rise to the need to repair them quickly and effectively. Hot mixes, especially Asphaltic Concrete (CA), are the ones with the best mechanical performance, but they require high technological and logistical control, making them unfeasible for small repairs. In this context, cold mixes such as Bagged Asphalt Mixture (MAE) and Cold Pre-Mixed (PMF) emerge as possible solutions for services such as "filler holes"' because they are easy to apply and require less energy than CA for its execution. The manufacturers of this mixture publicize on their websites that MAE is a CA that can be stored, however, studies already carried out on this mixture have shown inferior performance of the same, if compared to CA as an asphalt coating. Therefore, the present study deals with comparing the physical and mechanical properties of the MAE with a PMF and a CA control. For this, after determining the binder content and the granulometric composition of the MAE through the binder extraction, a number of standard rotations in the Rotary Compactor for the three mixtures was found. Then, the control mixtures were produced, with the same granulometric composition and binder content as MAE. All specimens (CPs) were molded in SUPERPAVE Rotary Compactor (CGS). The mechanical tests performed were: Tensile Strength, Resilience Modulus, Induced Moisture Damage and diametrical compression fatigue. MAE presented lower mechanical performance than the two control mixtures, contrary to what some manufacturers disclose, being the PMF more suitable for repair services. The results show the need for standardization of the MAE since its mechanical performance did not even approach that of a PMF, not matching, therefore, the information advertised about this type of mixture.