MICROCAPSULES AND INDUCTION HEATING: TWO METHODS FOR CLOSING CRACKS IN ASPHALT POROUS PAVEMENTS

Asphalt concrete is widely known to be a self-healing material, by repeated loading the micro-cracks have appearing and disappeared when both faces of a fissure touch. This process is applied until the crack is completely gone and the material regains its prior resistance.  In this study, two strategies are presented to boost of healing rate and applied in porous asphalt, one of them is induction heating.  This method is used by mixing 1.1% of steel wool fiber to speed up this phenome, with 20mm aggregate size for porous asphalt mixture and 21% air voids content.  Another approach is self-healing by 0.5% encapsulated agents using. These capsulate are incorporated within the asphalt mixture, then the capsules break when subjected to repeating loading on the asphalt surface. It has been discovered that there is a moment in the lifespan of an asphalt road where the capsules or induction heating applied can successfully self-heal the existing crack damage.