• interaction between baco3 and opc/bfs composite cements at 20 °c and 60 °c

    جزئیات بیشتر مقاله
    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
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     a baco3 slurry, containing radioactive 14c, is produced during the reprocessing of spent nuclear fuel. this slurry is encapsulated in a portland-blastfurnace slag composite cement. the effect of baco3 on the hydration of opc and portland-blastfurnace slag cements has been studied in this work. samples containing a simulant baco3 slurry were cured for up to 720 days at 20 and 60 °c and analysed by xrd, sem(edx) and icc. baco3 reacted with opc to precipitate baso4 from a reaction between soluble sulfate and baco3. calcium monocarboaluminate subsequently formed from the carbonate released. the monocarboaluminate precipitated as crystals in voids formed during hydration. at 60 °c in opc, it was not identified by xrd, suggesting the phase is unstable in this system around this temperature. in the portland-blastfurnace slag cements containing baco3, less monocarboaluminate and baso4 were formed, but the hydration of bfs was promoted and monocarboaluminate was stable up to 60 °c.

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