Old tires get a second life in roads built to last longer, handle heat

Researchers at Charles Darwin University (CDU) in Australia’s Northern Territory are developing innovative road materials by recycling worn-out tires and plastics to create more durable and heat-resistant asphalt. The region faces unique climate challenges—extreme heat, UV exposure, and environmental stresses—that cause traditional roads to become brittle and damaged over time. By incorporating crumb rubber-modified binder (CRMB) and recycled plastic-modified binder (RPMB) into asphalt, the team aims to improve road longevity, reduce construction costs, and minimize environmental impact compared to conventional polymers. Initial findings show that CRMB offers strong resistance to oxidative, thermal, and UV aging, enhancing asphalt durability in harsh conditions. RPMB’s performance is more variable and depends on factors such as polymer type and dosage, requiring further study. Both materials demonstrate potential for moisture resistance, though challenges remain regarding the interaction of rubber particles and plastic properties within the asphalt mix. The project also supports a circular economy by encouraging investment in local recycling facilities, addressing the significant waste