Influência das temperaturas de usinagem e compactação em misturas asfálticas mornas com óleo de girassol.

Abstract

In recent years, concerns about the environment have intensified and the asphalt paving industry has become a focus in the pursuit of environmental preservation. The Warm Mix Asphalt is an alternative to the conventional asphalt mixtures as it can reduce the emission of polluting gases into the atmosphere and improve the working conditions. The use of oleic additives in the mixture has shown to be promising for the reduction of the mixing and compaction temperatures. The present study had the objective of evaluating the addition of the sunflower oil into the asphalt binder as well as to verify the influence of the reduction in 10 oC and 20 oC of the temperature determined by the rotational viscosity test on the mechanical properties of the asphalt mixtures. The mechanical tests of Indirect Tensile Strength, Resilience Modulus, Modified Lottman and Flow Number were performed. The results show that, among the studied mixtures, those that presented the best mechanical response were the mixtures produced at 10 oC below the optimum temperature. These mixtures have met the specifications for quality of the resulting pavement and have shown even better results than the mixture produced with the non-modified asphalt binder. The results are relevant as they also promote a lower impact on the environment with the lower emission of pollutants, due to the reduction of mixing and compaction temperatures, besides the energy savings.