Speaker
Description
Abstract. The maintenance and rehabilitation of road pavements consume high annual budgets from road administrations, are associated with a huge production of waste, and consequently a large use of natural resources. In this way, the multi-recycling of reclaimed asphalt pavement (RAP) presents itself as a solution to part of the problem, thus avoiding its classification as waste and consequently landfill.It is necessary to use rejuvenators throughout the successive recycling cycles to recover the properties of the RAP’s bitumen fraction, so if different rejuvenators are used in successive recycling cycles, their interaction must be evaluated. To evaluate the inter-action between two rejuvenators of different origins considering two recy-cling cycles in RAP mixtures with high incorporation rates (75%) for wear-ing courses, laboratory tests were carried out to characterise the rejuvenated bitumen blends, and the bituminous mixtures regarding the mechanical properties, surface characteristics and volumetric properties.The results were compared with a previous case study where were evaluated three AC 14 surf 35/50 mixtures: one with virgin materials, and two with 75% RAP incorporation recycled one and two times with the use of a rejuvenator. Therefore, the interaction between two different rejuvenators, from similar samples, in the same recycling cycle, did not present significative variations in the tests and characteristics of the RAP, demonstrating good compatibil-ity between the rejuvenators.
