The self-healing performance of asphalt binder and mixtures: a state-of-the-art review

The intrinsic ability of asphalt pavement to undergo self-healing is not sufficient enough to effectively repair fractures resulting from a range of variables, including traffic load, asphalt aging and weather conditions. Consequently, the field of self-healing technology is focused on advancing crack repair techniques by employing microwave and induction heating and encapsulation amongst other healing procedures. These approaches make use of a range of additives, including waste materials and polymers, to facilitate the healing process. The present paper provides an in-depth review of self-healing technologies used for asphalt pavements, this including their conceptualization, development, application and the methods used to evaluate its performance. The self-healing capacity of materials can be influenced by various parameters including humidity, molecular diffusion, induction conditions, temperature and time. As such, treatments have the potential to enhance self-healing capacity, but with varying degrees of success depending on the specific evaluation indicator and healing situation. By examining international research, this review will also draw attention to the global relevance of the applicability of asphalt self-healing techniques used to enhance the durability and sustainability of transportation infrastructures worldwide. This paper therefore, serves as a valuable resource for researchers, practitioners and policymakers engaged in the pursuit of innovative solutions for resilient and cost-effective pavement systems on an international scale. This review also proposes prospective pathways for further study that will serve as a basis for future development of the industry.