Recycling aggregate from wasted concrete by pulsed discharge inside of concrete

In Japan, the treatment of waste concrete scraps has been one of the environmental issues. Therefore, the new application using pulsed power technology has been developed as the recycling method of coarse aggregates in waste concrete scraps. In the work, the dependences of the quality of the recycled coarse aggregate on the consumption energy and gap distance were investigated and the best condition of the discharge parameter was found. From the results, it is clear that the quality of the recycled coarse aggregate was controlled by the consumption energy of the discharge treatment and the discharge condition of 1.6 kJ/Pulse (400 kV_0.2 ??F) can produce the recycled coarse aggregate under the regulation by Japan Industrial Standard (JIS A 5005 and JIS A 5021) efficiently Besides, the result showed that the optimum condition was obtained in case that the high voltage point electrode always comes in contact with the target concrete.