Preparation of Cold Mix Asphalt using Reclaimed Asphalt Pavement

Rajasri V1, Dr. Ganapathi Malarvizhi 2
1Post Graduate Student, Civil Department & College of Engineering, Guindy
2Professor, Civil Department & College of Engineering, Guindy

Abstract - With increasing urban development and traffic growth, the demand for road construction materials has increased significantly, leading to depletion of natural aggregates and increased environmental pollution due to conventional Hot Mix Asphalt production. Cold Mix Asphalt prepared using bitumen emulsion at ambient temperature provides a sustainable alternative as it reduces energy consumption, fuel usage, and greenhouse gas emissions. Reclaimed Asphalt Pavement, obtained from milling of existing pavements, contains valuable aggregates and aged bitumen binder, and its reuse helps in resource conservation and waste reduction. This study focuses on the utilization of RAP in cold mix asphalt by partially replacing virgin aggregates with RAP at different proportions. Bitumen emulsion and rejuvenator are used to improve the performance of the recycled mix. Laboratory tests such as Marshall Stability and Indirect Tensile Strength areconducted to evaluate the performance of the mix. The study also examines the suitability of RAP-based cold mix asphalt for pavement maintenance works such as pothole patching, microsurfacing, thin overlays, and repair of distressed pavement  sections. The results indicate that RAP cold mix asphalt can be used as a sustainable and economical material for road maintenance applications.
Key Words: Cold mix, Recycling Asphalt Pavement