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Journal Articles

Solidification and stabilization of strontium and chloride ions in thermally treated calcium aluminate cement modified with or without sodium polyphosphate

Irisawa, Keita; Namiki, Masahiro*; Taniguchi, Takumi; Garcia-Lodeiro, I.*; Kinoshita, Hajime*

Cement and Concrete Research, 156, p.106758_1 - 106758_8, 2022/06

https://doi.org/10.1016/j.cemconres.2022.106758

Times Cited Count：12 Percentile：64.20(Construction & Building Technology)

Cementation of aqueous radioactive waste contaminated with a significant $^{90}$ Sr is challenging, and utilization of calcium aluminate cement (CAC) modified with sodium polyphosphate (CAP) is interesting. The present study investigated solidification and stabilization of Sr $^{2+}$ and Cl $^{-}$ ions in CAC and CAP cured in open system at 90 $^{circ}$ C and in closed system at 20 $^{circ}$ C. A leaching test showed that Sr $^{2+}$ ion could be stabilized more effectively in the CAP than in the CAC. On the other hand, the CAC cured at 20 $^{circ}$ C had the best stabilization for Cl $^{-}$ ion among the samples. Friedel's salt formed in the CAC may have contributed to the immobilization of Cl $^{-}$ ion. Although the stabilization of Cl $^{-}$ ion by CAP was less effective than CAC, it was significantly improved by the thermal treatment. The results may suggest that Cl $^{-}$ ion in the CAP was incorporated in the poorly crystalline apatite structure.