Coarse Aggregate Recycling by Pulsed Discharge Inside of Concrete

Abstract

In Japan, the treatment of waste concrete scraps has been one of the environmental issues. Therefore, new application using pulsed power discharge has been developed as the recycling method of the coarse aggregates from the waste concrete scraps. In the work, the dependences of the quality of the recycled coarse aggregate by the repetitive pulsed discharge treatments on the consumption energy were investigated. As the results, it was clear that the quality of the recycled coarse aggregate could be controlled by the number of discharge treatments. The recycled coarse aggregate, which satisfied class H under the regulations of Japan Industrial Standard (JIS A5005 and JIS A5021), was produced with the smallest consumption energy when the discharged energy from 0.02 µF of capacitor charged up to 400 kV applied to the waste concrete scraps during single discharge treatment.

Electrical breakdown channel locality in high voltage pulse breakage

“…A number of studies which investigated the feasibility of liberating concrete with electrical comminution for the recycling purposes have been reported (Bluhm et al, 1997(Bluhm et al, , 2000Frey et al, 2002;Fujita et al, 2001a;Menard et al, 2011;Inoue et al, 2009;Wang et al, 2009). This paper applies the same technique for a different purpose -to study the effect of electrical breakdown channel locality.…”

Reduction of contaminated concrete waste by recycling aggregate with the aid of pulsed power discharge

“…Comparing mortar matrix and aggregate in concrete, the mortar areas could contain air voids. Electrical breakdown therefore occurs in mortar prior to coarse aggregate, allowing separation along the interface between mortar matrix and aggregate [10,[12][13][14].…”

Separation of Aggregate From Asphalt Concrete Using Pulsed Power Technology

“…For ordinary concrete, the crushing processes to make recycling aggregate have been overcome by pulsed power discharge inside ordinary concrete waste to produce high-quality recycled coarse aggregate [5]. Reference [6] defined pulsed power discharge as a technique that spatially and temporally compresses and superimposes stored energy, thereby concentrating, controlling, and transmitting a large amount of power within a small space, for only a short time.…”