SELF-HEALING ASPHALT IN ROAD ENGINEERING
Abstract
Microcracking is a major contributor to the structural deterioration of asphalt pavements under cyclic traffic loading and environmental exposure. Although initially invisible, microcracks progressively develop into macrocracks, leading to stiffness reduction and premature pavement failure. This study investigates induction-heated self-healing asphalt as an innovative method for controlling microcrack propagation. The technology incorporates electrically conductive steel fibers into the asphalt mixture, enabling controlled heating through electromagnetic induction. The generated heat lowers binder viscosity and promotes molecular diffusion, resulting in effective crack closure. Laboratory fatigue tests demonstrate stiffness recovery rates of 80–95% and fatigue life extension up to three times compared to conventional mixtures. Microstructural observations confirm improved aggregate–binder adhesion after healing cycles. Life cycle analysis suggested extended service life and reduced environmental impact. Despite higher initial costs, induction-heated self-healing asphalt offers significant long-term durability and sustainability benefits for pavement engineering.
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