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Effects of composition on calcium aluminate phosphate cement for caesium nitrate incorporation

Irisawa, Keita  ; Yeung, S. W.*; Suriwong, P.*; Kinoshita, Hajime*

In order to evaluate the applicability of calcium aluminate phosphate (CAP) cement as a matrix for nuclear wastes, we investigated the compositional effects on the CAP cement focusing on the caesium incorporation. The CAP samples were prepared by mixing calcium aluminate cement (CAC) with the aqueous solution of (NaPO$$_{3}$$)$$_{n}$$ and CsNO$$_{3}$$. CsNO$$_{3}$$ re-precipitated in the conventional CAC sample, suggesting a limited interaction of CAC with CsNO$$_{3}$$. The increase in the polyphosphate content limited the conventional hydration of CAC and the relative amount of CsNO$$_{3}$$ re-precipitation. This is interesting as it may show a potential interaction between CAP matrix and CsNO$$_{3}$$.

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