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Development of solidification techniques with minimised water content for secondary radioactive aqueous wastes in Fukushima, 3; Effects of phosphates on calcium aluminate cement under hydrothermal conditions

Garc$'i$a-Lodeiro, I.*; Gao, Y.*; Chavda, M.*; Irisawa, Keita  ; Meguro, Yoshihiro  ; Kinoshita, Hajime*

The present study investigates the effect of phosphates on hydrothermal treatment of CAC system at 60$$^{circ}$$C, 105$$^{circ}$$C and 180$$^{circ}$$C. The treatment of conventional CAC resulted in formation of stable C$$_{3}$$AH$$_{6}$$ and $$gamma$$-AlOOH. Modification by mono-phosphate appeared to have delayed the hydration and overall reaction of CAC, whereas poly-phosphate appeared to significantly stabilise the amorphous binding phase up to 180$$^{circ}$$C. No crystalline phase was observed except hydroxyapatite when poly-phosphate was used.



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