Experimental Investigation and Development of Sustainable Green Pavement Materials for Eco-Friendly Road Infrastructure

For reproducibility, future investigations should document the source and age of RAP, milling depth, residual binder content, fractionation procedure, PCD composition, washing or cleaning procedure, aggregate moisture condition, mixing temperature and compaction energy. These variables can materially influence the measured optimum binder content and performance. A recycled mixture reported without these details is difficult to transfer reliably to another project. Field validation should begin with a controlled trial section using the selected VG-30 recycled mixture. The trial should compare laboratory predicted density and binder content with plant production results. During construction, temperature, mixing time, laydown temperature and roller passes should be recorded. After opening to traffic, periodic surveys should measure rut depth, cracking, surface defects and drainage performance. Longer-term monitoring should ideally cover at least one complete seasonal cycle and should be extended for multiple years where possible. The field observations can then be compared with laboratory ITS, TSR, stability and rheological indicators. Such correlation would help establish whether the laboratory optimum identified in this project translates into durable pavement performance under actual traffic and climate conditions.

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