Characterization of Cold Recycled Asphalt Mixes with Indirect Tensile Strength and Complex Modulus

To reduce the amount of carbon footprint and use a cleaner asphalt pavement, cold recycled mixtures (CRM) are of great importance and potential. CRMs due to reduced temperature in both mixing and compaction and due to the application of higher amounts of reclaimed asphalt pavement (RAP), materials could have a great impact if their properties could be improved. Even though CRM is the greenest asphalt pavement to date, the application of Portland cement which is used to increase the early strength of CRMs does still have an impact on pollution, and removing cement could even greatly reduce the air pollution, energy consumption, and carbon footprint. In this study, two different gradations were selected to produce CRMs without the addition of active filler to evaluate the evolutive behaviour of the mixtures. The results showed that the gradation, even if only different in the very fine part, as a significant impact on ITS and on the evolutive behaviour. As expected, the ITS increases with time and also with the curing temperature. As for complex modulus, the results show that CRMs are sensitive to the increase in confining pressure, but showing at the same time viscoelastic properties.