In this work, the immobilization of simulated radionuclide Sr-90 by fly ash-slag-metakaolin-based geopolymer was investigated. It was found that the thermal stability (high-temperature and freeze-thaw resistance) of the geopolymer waste forms were better than that of cement. The geopolymer waste forms can acquire a compressive strength up to 10 MPa after 2 h calcination at 1000 degrees C. Furthermore, the leaching tests revealed that the fly ash-slag-metakaolin-based geopolymer waste forms had lower cumulative fraction leaching rates of Sr-90 than that of cement. These results gave encouragement for the idea that the fly ash-slag-metakaolin-based geopolymers could be used as low cost and high efficiency host materials for the immobilization of radioactive wastes.
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