Self-healing capacity of asphalt mixtures with steel fiber, steel slag and graphite powder, evaluated with microwave induction and fatigue test

Self-healing in asphalt mixtures can be induced by adding particles that are susceptible to heating electromagnetic microwaves. This process allows the closure of microcracks caused fatigue phenomenon and extend service life pavement. In this article, self-healing index without with addition steel slag (15% 65.7%), fibers, (0.2% 0.4%), graphite powder 65.7%) was evaluated. The determined after subjecting damage, microwave heating, rest, damage again. Results showed all additions led healing capacity. A higher observed when mixture produced than powder. It found use a content fibers more effective for healing, successful must heated temperatures ranging between 50°C 75°C. results also it is possible achieve high values having subject heating.