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Immobilization of Simulated Radionuclide 90Sr by Fly Ash-Slag-Metakaolin–Based Geopolymer

Xiaonan Liu, Yi Ding, Xirui Lu

Nuclear Technology / Volume 198 / Number 1 / April 2017 / Pages 64-69

Technical Paper /

First Online Publication:April 21, 2017

In this work, the immobilization of simulated radionuclide 90Sr 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°C. Furthermore, the leaching tests revealed that the fly ash-slag-metakaolin–based geopolymer waste forms had lower cumulative fraction leaching rates of 90Sr 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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