Author(s): Mei-Ling Huang and Chia-Wei Lin

Abstract: This study investigates the impact of self-healing asphalt on pavement performance under heavy traffic loads, focusing on the integration of microencapsulated rejuvenators and conductive fillers to enhance structural durability and fatigue resistance. Conventional asphalt pavements often suffer from progressive microcracking, stiffness degradation, and rutting due to repeated high-load applications and ageing, necessitating frequent maintenance and costly interventions. To address these challenges, self-healing asphalt mixtures were developed and tested using a combination of electromagnetic and thermal activation techniques. Laboratory experiments involving four-point bending fatigue tests, wheel-tracking evaluations, and stiffness recovery assessments demonstrated that self-healing asphalt achieved higher fatigue life, lower crack propagation rates, and improved healing ratios compared to control mixtures. Statistical analysis confirmed significant differences between conventional and self-healing specimens, with the latter exhibiting approximately 45% higher fatigue life and a 20% reduction in rut depth. The results suggest that timely activation of the healing mechanism before extensive damage accumulation can effectively restore mechanical integrity and extend pavement lifespan. Moreover, the study established that while self-healing processes delay permanent deformation, they do not completely eliminate it, emphasizing the importance of optimized activation cycles and material composition. Practical recommendations include incorporating conductive fillers to facilitate energy-based activation, optimizing microcapsule concentrations, and adopting scheduled maintenance strategies integrating induction or microwave-assisted healing in high-traffic zones. The findings underline the potential of self-healing asphalt as a sustainable, cost-effective, and durable alternative to conventional pavements, with the capacity to reduce lifecycle costs and environmental impacts while improving roadway longevity and performance.

Pages: 55-59 | Views: 4 | Downloads: 2

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