[1B09-13] Cement and geopolymer for solidification 1

3:15 PM - 3:30 PM JST(6:15 AM - 6:30 AM UTC)

[1B11] A Study on the Methodology for Rational Treatment/Disposal of Contaminated Concrete Waste Considering Volume Reduction of Waste(12)Development of a new method for improving the solidification of radioactive waste

*Atsushi Matsui¹, Tamotsu Kozaki¹, Naoko Watanabe¹, Yuka Morinaga¹, Rei Yoshihara¹, Katsuhumi Hashimoto¹ (1. Hokkaido Univ.)

Keywords:

Low-level radioactive waste,solidification by filling hardened materials,X-ray CT,cement,geopolymer,porosity

Solidification treatment by filling cementitious material is applied to low-levelradioactive waste such as metals and concrete. In addition, the solidification treatment of dehydrated carbonate slurry using cement, AAM, etc., is being considered for decommissioning the Fukushima Daiichi Nuclear Power Plant. However, in the treatment, there is a problem in that air remains inside or between waste materials after the filling material is added, increasing the porosity of the solidified waste and degrading the performance of the waste. This presentation reports, based on X-ray CT observationresults of solidified samples, that the porosity of the waste is drastically reduced using anew method for which a patent application is currently pending.