Separation of contaminated concrete
The volume of contaminated concrete from decommissioned nuclear facilities may be significantly reduced by separating the contaminated from the non-contaminated parts. It is shown that the radioactive contamination is mostly in the cementstone, which is normally about 30% of the total concrete volume. A separation procedure combining milling with either hot or cold thermal shock is assessed. The procedure is not able to separate the cementstone from the larger aggregates completely. However, the cementstone from the concrete with a low nominal grain size seems to be almost completely removed by the combination cold thermal shock/milling, while the cementstone from the concrete with a high nominal grain size seems to be almost completely removed by the combination hot thermal shock/milling. After both methods a layer of cementstone was still visible on the aggregates. In the third part of this research project a washing procedure with water and nitric acid was investigated, which removed each 2 wt% of cementstone.
Bibliographic Reference: EUR 12562 EN (1990) 13 pp., MF, ECU 4
Record Number: 199010163 / Last updated on: 1994-12-01
Original language: en
Available languages: en