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Reclaimed Asphalt Pavement (RAP) recycling in pavement engineering can be actually carried out by means of hot recycling and cold recycling. An additional option arise from mixing with natural aggregates to build the sub-base layer. This paper shows the first results of a research activity undertaken on a test track specifically constructed with the aim to analyze the effect on pavement performance of a sub-base layer mixture with 50% of natural aggregates and 50% of RAP. The investigation is based on LWD and FWD analysis, comparing results with those obtained on the subsequent section of the test track made by only natural aggregates.

In this paper, the effect of adding Reclaimed Asphalt Pavement (RAP) and Recycled Asphalt Shingles (RAS) on low temperature properties of recycled asphalt mixtures is investigated through Bending Beam Rheometer (BBR) tests. A back calculation transformation, derived from analogical modeling of rheological behavior, and a micromechanical model are used to predict the asphalt binder creep stiffness from mixture experimental data. The, results are then compared with the experimentally determined BBR creep stiffness on extracted binders. Results indicate the addition of RAP and RAS significantly affects low temperature performance and the effects are related to mixing and blending processes.