Asphalt rejuvenator for more sustainable pavements: characterization, application and strategic implementation

Abstract

Asphalt, a critical material in roadway construction, undergoes aging due to thermo-oxidation, leading to increased cracking and reduced durability. Rejuvenators have been identified as a potential solution to mitigate the adverse effects of aging on asphalt binder. Despite this, significant gaps persist in our understanding of how these rejuvenators function chemically within the asphalt binder. Furthermore, there is a notable lack of established guidelines, industry standards, and optimal application methods, which hinders the effective and widespread adoption of rejuvenators. This dissertation employs a comprehensive methodology that includes systematic literature reviews, laboratory experiments, and field studies to thoroughly evaluate the efficacy of rejuvenators. The findings indicate that rejuvenators chemically change the aged binder and enhance its performance, enabling the incorporation of higher percentages of recycled materials without compromising quality. Additionally, the study explores the potential of bio-rejuvenators formulated as fog-seal treatments, demonstrating their capability to improve pavement performance while minimizing environmental impacts. By addressing these critical gaps, this research contributes to a deeper understanding of asphalt rejuvenation, paving the way for more effective utilization of rejuvenators in the asphalt industry.