Influência da redução das temperaturas de usinagem e compactação em misturas asfálticas com cera de carnaúba.

Abstract

In recent years, the paving area has been following a world trend of seeking more sustainable technologies in order to reduce damages to the environment and workers involved in paving services. Based on that, warm asphalt mixtures appear as a solution capable of reducing the production temperatures of the asphalt without compromising its performance, and also providing economic advantages. The addition of carnauba wax to the asphalt mixtures proved to be an efficient alternative in reducing machining and compaction temperatures of the mixtures. Thus, this work’s aim was to evaluate the mechanical properties of modified asphalt mixtures with 2% of carnauba wax from the reduction of machining and compacting temperatures. In order to evaluate the effects of the reducing of the production temperatures of the modified mixtures with carnauba wax, the mechanical tests of Indirect Tensile Strength, Resilience Modulus and Modified Lottman were performed. Compared to pure binder mixtures, the modified mixtures with carnauba wax presented better mechanical results at the tests performed. The reduction of 10°C in the machining and compaction temperatures of the mixtures with wax, presented satisfactory results and also superior to the mixtures with pure binder mixtures, but inferior to those with wax, produced and compacted at optimum temperatures. The results obtained were very relevant since the reduction of machining and compaction temperatures promoted an energy saving and lower impacts on the environment and workers conditions, besides complying with the mechanical requirements for paving.