There is an increasing demand for asphalt producers to utilise higher percentages of recycled asphalt. The chief hurdles are maintaining quality – and developing mix that lasts.

Ammann recently partnered with customers and researchers from Empa to develop mix comprised of 100% RAP under varied conditions utilising an Ammann Uniglobe 200 with RAH100 Dryer. The research project was funded by the Swiss Federal Environmental Agency FOEN. The asphalt producer, and Ammann customer, BHZ Baustoff Verwaltungs AG was also a project partner.

The bottom line: The results showed that 100% RAP mixtures could be designed with the performance similar to a wearing coarse mixture AC 8N. The report offers much additional valuable information, including the best steps in the process to add rejuvenators.

Full report