Predicting the Performance of the Induction Healing Porous Asphalt Test Section

摘要

The induction healing concept of porous asphalt was developed at Delft University of Technology and was proven very successful in the laboratory. A porous asphalt test section with this self healing concept was also paved on Dutch highway A58 This special porous asphalt contained 4% steel wool (by volume of bitumen). A number of cores were drilled from this test section to predict its performance. Beams were also prepared with the same materials as used in the test section. Experiments were done on these specimens to study the mechanical, heating and healing properties. It is found in Cantabro test that the particle loss resistance of porous asphalt concrete is improved by addition of steel wool. The improvement in particle loss resistance will delay ravelling on the pavement. It is also proven that the cores containing steel wool can be heated quickly with induction energy. Finally, it is found that the fatigue life of the beamsis extended greatly by applying induction heating during the rest period. The damage (cracking) in the porous asphalt beams ishealed by induction healing. Based on these findings, it is concluded that the life time of the test section will be extended by the reinforcement of steel wool and induction heating.