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Due to the large number of rehabilitation jobs carried out due to the asphalt layer cracking on highways, alternative techniques have been studied in order to find more efficient and advantage solutions. One of the alternatives to the milling and recomposition process is the application of stress relief asphalt mixtures on the deteriorated surface, as a way to mitigate the reflective cracking in the new asphalt layer. These layers are generally characterized by highly modified asphalt binders and fine aggregate size particles, ensuring higher resilient capacity to the layer. At the same time, a worldwide trend of recycling and reutilization of the Reclaimed Asphalt Pavement (RAP) has been growing. The aim of the present study is to evaluate, at the binder level, the viability to use the finer part of the RAP, richer in asphalt binder, combined with a rejuvenating agent (RA), for the stress relief asphalt mixture layers, with 100% activation of the RAP binder consideration, and consequently reduced need of new modified binder. The characteristics of the isolated and combined binders with the rejuvenating agent, were evaluated. Tests to obtain the linear viscoelastic properties, tests related to the binders ́ characterization in terms of permanent deformation (Multiple Stress Creep and Recovery, MSCR), fatigue cracking (Linear Amplitude Sweep, LAS) and low temperature behavior (Bending Beam Rheometer, BBR) were analyzed. A new approach to the RA design method was proposed considering these results. Results showed that the addition of the RAP aged binder increased the stiffness of the new highly modified binder, decreased its recoverability (R), increased its non-recoverable compliance (Jnr), decreased its fatigue life and worsen its low temperature behavior. From the proposed method it was found that the addition of around 8.0% of the rejuvenating agent partially recovered these properties, showing the potential use of RAP in crack anti-reflective asphalt mixtures.

Avaliação a nível de ligantes da aplicabilidade de material fresado na execução de misturas asfálticas antirreflexão de trincas.