Abstract
This paper aimed to investigate the effect of nano-graphite (NG) as a conductive additive and specific heat capacities of aggregates on the self-healing performance of the asphalt mixtures. In this research, three types of aggregates, including Limestone, Granite, and Dolomitic Limestone, with different contents of NG (5%,10%, 20%, and 30% by the weight of bitumen) were used. The indirect tensile tests (IDT) were applied to evaluate the microwave healing capability of broken samples. The healing index (HI) analysis showed that the optimum amount of NG was 10% by weight of bitumen, which restored tensile strength in healed samples above half of their original strength. Also, it was found that among the mixtures containing optimum NG, the sample with Granite aggregate consumes 16% and 30% less heating energy than samples with Dolomite Limestone and Limestone aggregates, respectively. In addition, results indicated that the HI of broken samples in the 24-hour rest period at ambient temperature has increased by 15 to 30 % compared to the 12 h.
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