Recycled asphalt pavement – fly ash geopolymers as a sustainable pavement base material: Strength and toxic leaching investigations

• Environmental evaluation of fly ash (FA) based geopolymer stabilized Recycled Asphalt Pavement (RAP).
• Microstructural development was examined via XRD and SEM analyses.
• UCS of RAP-FA geopolymers and RAP-FA blends were compared with road authorities' requirements.
• The leachability of the heavy metals is measured by TCLP and compared with international standards.