Abstract
The sorption behaviors of cesium (Cs) and strontium (Sr) during the formation of calcium silicate hydrate (C–S–H) without drying processes were monitored for 1–14 days for non-cured C–S–H and for 1–7 days for 30-day-cured C–S–H. In the results, the Raman spectra of the solid phase showed that the polymerization of the silicate chain in C–S–H progressed with time, and the degree of polymerization increased at the lower Ca/Si molar ratio. While, the sorption ratios remained constant during the experimental period, indicating that the sorption sites are formed just after the C–S–H synthesis and hardly change over 30 days. The sorption distribution coefficients were estimated to be 1–12 mL/g for Cs and 2–35 mL/g for Sr, whose values increased with the Ca/Si molar ratio decreasing in the range of 0.4 to 1.6. These suggest that C–S–H even under the formation process as a secondary mineral might retard these migrations.
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The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.
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Acknowledgments
This work was supported by JSPS KAKENHI Grant Numbers 21H04664 and 22K14627.
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This study was supported by JSPS KAKENHI Grant Nos. 21H04664 and 22K14627.
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All authors contributed to the study conception and design. Data collection and analysis were performed by TS and RT. The first draft of the manuscript was written by TS, and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Seki, T., Tamura, R., Chida, T. et al. Sorption behavior of cesium and strontium during the formation process of calcium silicate hydrate as a secondary mineral under the condition saturated with groundwater. MRS Advances 8, 224–230 (2023). https://doi.org/10.1557/s43580-022-00488-9
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DOI: https://doi.org/10.1557/s43580-022-00488-9