硅酸盐水泥
材料科学
泥浆
碳酸钡
熔渣(焊接)
水泥
复合数
冶金
化学工程
矿物学
复合材料
化学
原材料
有机化学
工程类
作者
Claire Utton,E. Gallucci,J. Hill,N.B. Milestone
标识
DOI:10.1016/j.cemconres.2010.11.006
摘要
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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