Mechanical, rheological and functional consequences of healing of porous asphalt mixtures by magnetic induction

Abstract

Magnetic induction technology has been extensively developed so far. However, the mechanical, rheological and functional consequences of repeated self-healing are still unknown. For this reason, this paper investigates the consequences of repeated healing cycles by magnetic induction in four chapters: first, the healing temperature of the experimental mixtures was determined and compared with a reference mixture, that was left to stand at room temperature for 90 days to assess the actual self-healing capacity of the asphalt mixtures. Second, the performance against particle loss was evaluated by applying different healing cycles in the cantabro test and particle loss by brush test. Third, rheological consequences on the binder were determined by penetration, ring and ball and dynamic shear rheometer. Fourth, functional consequences on the mixture were studied in terms of permeability and noise absorption capacity. In this way, we are analyzing the impact of the healing cycles on the mechanical performance of the mixture, the properties of the binder and the functional properties respectively. Regarding the results, healing by magnetic induction in porous asphalt mixtures reduces particle loss to a third. Furthermore, there are no statistically significant differences in the performance of the residual binders of the reference mixture without healing cycles and the residual binder of the experimental mixtures after 20 healing cycles. Finally, with respect to their functional properties, repeating the healing cycles 20 times produces a small decrease in the permeability capacity, which is not statistically significant. At the same time, repeated healing cycles significantly increase the noise absorption capacity of the asphalt mixture, possibly due to a slight draining of the binder, which increases the porosity at the top of the mixtures.