, Gilberto Del Zoppo
, Anna Crespi
https://doi.org/10.7409/rabdim.026.009
Among the strategies for reducing greenhouse gas emissions, the use of recycled materials represents a key lever; this practice not only reduces the consumption of natural resources but can also significantly contribute to lowering CO2 emissions. By using recycled materials, we largely avoid the industrial processes associated with the extraction, processing, and production of new materials, which are among the main sources of greenhouse gas emissions. At the national level in Italy, the new Ministerial Decree (DM) of August 5, 2024, aligns with the regulatory framework by incorporating European directives on environmental sustainability. One of the key innovations introduced is the establishment of guidelines requiring bituminous mixtures to contain a minimum percentage of reclaimed asphalt pavement (hereafter referred to as RAP), rather than a maximum percentage as was previously the case. In this article common Italian approach to the use of RAP will be described, starting from the selection of RAP, its differentiation and storage; how to use it in production for optimal results, and which rejuvenators to use to restore the maltenic fraction of the oxidized RAP binder. In conclusion, to ensure that the addition of RAP to the asphalt mix does not negatively affect the pavement’s lifespan, the most important quality control tests will be presented, along with a table of the main technical specifications. Finally, as an example of how the rejuvenator additives work, a case study will be presented in which a high-performance rejuvenator additive (ACF) was used, allowing an increase in RAP content compared to current standards, while maintaining high physical and mechanical properties.
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