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The Technical Development for Reuse of Radioactive Concrete Waste Generated by Dismantling of Nuclear Facilities

[+] Author Affiliations
Byung Youn Min, Wang Kyu Choi, Jung Woo Park, Chong Hun Jung, Won Zin Oh

Korea Atomic Energy Research Institute (KAERI), Daejeon, South Korea

Paper No. ICONE16-48315, pp. 799-803; 5 pages
doi:10.1115/ICONE16-48315
From:
  • 16th International Conference on Nuclear Engineering
  • Volume 1: Plant Operations, Maintenance, Installations and Life Cycle; Component Reliability and Materials Issues; Advanced Applications of Nuclear Technology; Codes, Standards, Licensing and Regulatory Issues
  • Orlando, Florida, USA, May 11–15, 2008
  • Conference Sponsors: Nuclear Engineering Division
  • ISBN: 0-7918-4814-0 | eISBN: 0-7918-3820-X
  • Copyright © 2008 by ASME

abstract

As part of a fundamental study for the reuse and recycling of contaminated concrete wastes generated by dismantling a research reactor, KAERI has been developing separation technology which recovers for reuse and recycling aggregates from the dismantled concrete. The separation is based on a thermal treatment followed by mechanical processes such as a crushing, milling and sieving. The separation test of concrete waste (i.e., light concrete and heavy concrete) was performed using radioisotope (60 Co). The distribution of 60 Co has been investigated for the effects of the heating temperature, washing and aggregate size such as gravel, sand and paste using a mechanical and thermal unit process. The experimental results showed that most of the 60 Co nuclide could be removed from the gravel, sand aggregate and concentrated into a paste. Especially, we found that the heating temperature played an important role in separating the 60 Co nuclide from the concrete waste. The optimum heating temperature for the removal of the 60 Co was about 500°C. According to an increase of the heating temperature, the amount of transferred 60 Co to the paste linearly increased because the bond between the aggregate and paste matrix is reduced. Contamination of concrete is mainly concentrated in the porous paste and not in the dense aggregate such as the gravel and sand. Concrete can be separated into contaminate and clean parts by means of a unit process based on a crushing, heating, milling and sieving at over 1mm. Through experiments, the clean aggregate can be reused and recycled by up to 70%. By thermally and mechanically separating this concrete waste from the clean dense aggregate particles, a considerable volume reduction can be reacted.

Copyright © 2008 by ASME
Topics: Concretes

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