Hyper-alkaline cement leachates generated from the cement buffer of a nuclear waste disposal site have significant influences on the mineralogy of the host rock, creating a chemically disturbed zone (CDZ). Three major types of cement leachates are formed during the evolution process. Most of the existing scenario modelling research has been focused on the influence of the cement leachate on the host rock. However, the influence of the groundwater in the host rock on the evolution of the CDZ remains unexplored. This paper presents a numerical scenario modelling of the couplings among carbonate groundwater, cement leachates and rock minerals. The results reveal that the high-carbonate groundwater significantly affects the precipitation of calcium silicate hydrate and calcite and consequently alters the physical and chemical properties of the host rock. This finding provides an essential guide for the selection of the location of a geological disposal facility in terms of groundwater chemistry.

中文翻译：

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岩石/碳酸盐岩地下水/水泥渗滤液的耦合

从核废料处置场的水泥缓冲液中产生的高碱性水泥渗滤液对基质岩的矿物学有重大影响，形成了化学扰动带（CDZ）。在演化过程中会形成三种主要类型的水泥渗滤液。现有的大多数情景建模研究都集中在水泥渗滤液对基质岩石的影响上。但是，在母岩中地下水对CDZ演化的影响尚待探索。本文提出了碳酸盐地下水，水泥渗滤液和岩石矿物之间耦合的数值情景模型。结果表明，高碳酸盐地下水显着影响硅酸钙水合物和方解石的沉淀，因此改变了母岩的物理和化学性质。这一发现为根据地下水化学选择地质处置设施的位置提供了重要指导。