A comparative study of durability characteristics of bio-enzyme cement-treated RAP mixes

The use of Reclaimed Asphalt Pavement (RAP) as a base layer in road construction is both economically and environmentally advantageous. Nevertheless, enhancing its performance typically necessitates stabilization. This research provides a comparative evaluation of the durability behavior of RAP mixtures stabilized with cement alone and with a combination of cement and bio-enzyme. The laboratory study examined the impact of repeated wetting and drying cycles to replicate real-world moisture variations. Key parameters assessed included Moisture-density variation, Unconfined Compressive Strength (UCS), mass loss percentage and, residual UCS. The results indicated that RAP mixes treated with both bio-enzyme and cement retained more strength and experienced less mass loss than those stabilized with only cement, reflecting improved resistance to moisture-related deterioration. These outcomes imply that bio-enzymes are promising, sustainable additives in pavement stabilization, potentially lowering cement usage and promoting eco-friendly construction practices.