Immobilisation matrices for intermediate level nuclear wastes using sulphate activated BFS/OPC and PFA/OPC composite cements
Immobilisation matrices for intermediate level nuclear wastes using sulphate activated BFS/OPC and PFA/OPC composite cements
复制标题
使用硫酸盐活化的 BFS/OPC 和 PFA/OPC 复合水泥固定中放核废料的基质
DOI：
10.1179/174367509x12447975734276
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发表时间：
2010
影响因子：
2.2
通讯作者：
P. Swift
中科院分区：
文献类型：
--
作者：
N. Collier;N. Milestone;P. Swift
核废料固定工业目前使用的普通波特兰水泥复合材料的高碱性孔隙溶液导致包封的活性金属的腐蚀，这产生氢，导致废物形式完整性的损失，并可能将放射性材料释放到环境中。本工作研究了使用近中性盐作为复合水泥粉的添加剂，以开发低碱性水泥浆体和减少活性金属的腐蚀。研究了在高炉矿渣或粉煤灰部分取代普通波特兰水泥中掺入硬石膏和石膏的影响。加入硫酸盐显着改变了散装水泥和铝腐蚀层的组成和微观结构与钙矾石的主要相检测。腐蚀过程中形成的氢氧化铝的量通过添加硫酸盐而显著降低，这是氢产生的速率。
The highly alkaline pore solution of ordinary Portland cement composites currently used by the nuclear waste immobilisation industry causes corrosion of encapsulated reactive metals which generates hydrogen, causes loss of wasteform integrity and may release radioactive material to the environment. This work has investigated using near neutral salts as additives to composite cement powders in order to develop less alkaline cement pastes and reduce the corrosion of reactive metals. The effect of adding anhydrite and gypsum to ordinary Portland cement partially replaced by blast furnace slag or pulverised fuel ash was investigated. Adding the sulphate salts significantly changed the composition and microstructure of the bulk cement and the aluminium corrosion layer with ettringite the main phase detected. The amount of aluminium hydroxide formed during corrosion was significantly reduced by adding the sulphate salts as was the rate of hydrogen generation.