ABSTRACT
This paper describes the environmental impacts and associated direct costs of two half-warm asphalt mixtures (HWMA) at 90°C, with 70% and 100% RAP, respectively, compared to a reference AC 16 hot mix asphalt (HMA). In order to evaluate the environmental impacts of the mixtures, local data was studied and its quality reviewed. The process used highlights the benefits for HWMA recycled mixtures and the limitations of the current inventory data available in the local region. Findings include: 1) the combination of RAP and HWMA processes provide significant environmental savings and economic benefits when compared to conventional HMA mixtures, in a cradle-to-gate assessment, 2) the 70% and 100% RAP mixtures were found to provide an average energy saving of 31% and 35%, respectively, 3) while there was a limited amount of data found for Spain, sufficient open-access data availability was found at a European level for conducting a LCA.
