eva‎luation of the self-healing capacity of asphalt concrete containing aluminum powder using induction heating under pure mode I and mixed mode I/III cracking at various temperatures

1/1/1900 12:00:00 AM

With the ever-growing demands of human, goods, and service transportation, the need for controlling loads and deformations on road surfaces to achieve the highest level of load-bearing capacity and deformation resistance throughout the service life and design life of road pavements, including concrete and asphalt pavements, is increasing daily. Since most pavements are designed as asphalt, the daily increase in global temperature and the rising rate of energy consumption have led to a growing demand for technologies that produce asphalt with longer service lives. Therefore, in line with economic efficiency and life-cycle cost, as well as reducing the harmful effects of environmental pollutants and enabling the recovery of the strength of hot mix asphalt, the innovative technology of self-healing using induction heating has been studied in this research. The objective of this research is to eva‎luate the self-healing capability of hot mix asphalt containing aluminum powder using the induction heating method. In this research, limestone aggregates, pure bitumen with a penetration grade of 100/85, and aluminum powder were used. To improve the induced healing process, aluminum powder with a size of 63 microns at 50% and 100% filler content and a particle size of 150 microns at 43% and 86% passing a 200-sieve, a total of four different asphalt mixtures were produced in the form of disc-shaped laboratory specimens. Based on previous studies, the healing level of asphalt mixtures under combined mode I and III loading using induction heating has not been investigated. Therefore, using ENDB disc-shaped specimens, this research addresses this research gap. The eva‎luation process of the research includes a fracture-repair-fracture cycle using a three-point bending test for specimen failure and an induction heating device for specimen repair. In this cyclic eva‎luation process, fracture toughness was used in three crack angle conditions (0 degrees for pure mode I, 35 and 50 degrees for combined modes I and III) and at two temperatures of -16 and 0 degrees Celsius, and the repair process was performed at two times of 80 and 120 seconds. The results showed that the healing index increased with increasing temperature and induction time. Additionally, asphalt mixtures exhibited a higher healing index in pure mode I.

مخلوط آسفالتي داغ , خودترميمي , گرمايش القايي , مكانيك شكست , مود تركيبي I/III

Hot-mix asphalt , Self-healing , Induction heating , Fracture mechanics , Mixed mode I/III

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