Research on Self-Healing Technology of SBS Modified Asphalt Concrete under the Dynamic Loading

Asphalt-based composites have the ability to heal themselves.without the aid of external influences (energy supply or material supplement), the self-healing ability of asphalt mixture is quite limited. In this paper, the efficiency of self-healing of asphalt mixture with Ni-Zn ferrite powders was analyzed based on the concept of microwave heating. We focused on assessing the characteristics of polyurethane (PU), base or styrene-butadiene-styrene (SBS) modified asphalt and its mixtures. The recovery rate of stiffness modulus and the fatigue life extension ratio were adopted to evaluate the self-healing efficiency of asphalt mixture. The analysis results proved that Ni-Zn ferrite powders can promote the self-healing ability of asphalt mixture significantly, the fatigue life extension ratio of 50% damaged ferrite-filled asphalt mixture can reach 1.33.