Asphalt additives called rejuvenators show potential for facilitating higher proportions of recycled asphalt pavement in road mixes. Two private companies, Cargill and Hardrives, have been testing a plant-based product, Anova, in a partnership with the Minnesota Dept. of Transportation and its MnROAD test facility and with the National Center for Asphalt Technology at Auburn University in Alabama.
Launched in 2018, the tests include a section of Interstate 94 in Minnesota. The asphalt mix included 45% recycled asphalt pavement (RAP), says Ben Worel, MnROAD research operations engineer for MnDOT. The typical ratio of RAP would be about 25%.