In response to the global plastic pollution problem and the large-scale demand for asphalt and mineral resources in road construction, the project team conducted research on the modification and dissolution principles of replacing 20% of asphalt with recycled thermoplastics, as well as the preparation methods for asphalt mixtures that replace 50% of mineral powder with recycled thermosetting plastics. They proposed construction control parameters and processes for on-site mixing, paving, and compaction.

The project outcomes were applied in the road reconstruction and expansion project, and a total of 9.8 tons of recycled thermoplastic and 23.6 tons of recycled thermosetting plastic filler were utilized, resulting in cost savings of 14.5% for asphalt and 41.4% for fillers, while significantly reducing CO2 emissions. This research transforms the end-of-life treatment of waste plastics from incineration and landfilling to the use as alternative paving materials, yielding significant economic and environmental benefits. The large-scale promotion and application of these outcomes is expected to bridge the industrial chain between recycled plastics and paving materials, opening new pathways to address plastic pollution and reduce paving material costs.