1. Introduction
2. Materials and Methods
    2.1 Concrete preparation and thermal treatment
    2.2 Sink-float separation process
    2.3 Carbonation of cement paste
3. Results and Discussions
    3.1 Contaminated cobalt removal test
    3.2 Potential removal of radiated cobalt
4. Conclusions
REFERENCES

• Seok-ju Hong(Pohang University of Science and Technology)
• Sangsoo Han(Pohang University of Science and Technology)
• Seongsik Nam(Pohang University of Science and Technology)
• Won-Seok Kim(Pohang University of Science and Technology)
• Wooyong Um(Pohang University of Science and Technology)