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<p>Approximately 14&#xa0;million m<sup>3</sup> of radioactive cesium (r-Cs) containing contaminated soil and waste was generated because of the Tokyo Electric Power Fukushima Daiichi Nuclear Power Plant accident in 2011. Volume reduction of the higher radioactive and combustible fraction of the waste was conducted by incineration and melting treatment. Through this treatment, the r-Cs were concentrated in the melting fly ash, and solidification was needed for the final disposal of the fly ash. A challenge for the solidification of melting fly ash is the retardation of cement hardening caused by heavy metals in the fly ash. This study revealed that the addition of alumina cement (CaO·Al<sub>2</sub>O<sub>3</sub>) to cement paste containing melting fly ash could enable cement hardening within 1&#xa0;day and achieve a strength of approximately 30&#xa0;MPa at 28 days of curing. Moreover, cesium leaching characteristics from the cement solidified bodies were evaluated. The evaluation revealed that preparing higher-strength solidified bodies with a reduced water–cement ratio enables lower r-Cs leaching rates. When the fly ash contained a glassy phase, a pozzolanic reaction in the cement solidified body increased the strength of the solidified body and decreased the r-Cs leaching rate.</p>

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Cement solidification and stabilization of melting fly ash of decontaminated waste contaminated with radioactive cesium

  • 期刊论文

  • 发表日期：

    2026年3月16日

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  • Takahito Yasukochi,
  • Kazuo Yamada,
  • Aiko Sato,
  • Satoshi Sakurai,
  • Hisao Tohma,
  • Shunji Oda,
  • Kazuto Endo,
  • Yuhei Tanaka,
  • Hiroyuki Arai,
  • Yasumasa Tojo

摘要

Approximately 14 million m3 of radioactive cesium (r-Cs) containing contaminated soil and waste was generated because of the Tokyo Electric Power Fukushima Daiichi Nuclear Power Plant accident in 2011. Volume reduction of the higher radioactive and combustible fraction of the waste was conducted by incineration and melting treatment. Through this treatment, the r-Cs were concentrated in the melting fly ash, and solidification was needed for the final disposal of the fly ash. A challenge for the solidification of melting fly ash is the retardation of cement hardening caused by heavy metals in the fly ash. This study revealed that the addition of alumina cement (CaO·Al2O3) to cement paste containing melting fly ash could enable cement hardening within 1 day and achieve a strength of approximately 30 MPa at 28 days of curing. Moreover, cesium leaching characteristics from the cement solidified bodies were evaluated. The evaluation revealed that preparing higher-strength solidified bodies with a reduced water–cement ratio enables lower r-Cs leaching rates. When the fly ash contained a glassy phase, a pozzolanic reaction in the cement solidified body increased the strength of the solidified body and decreased the r-Cs leaching rate.