Abstract Solidification performance for cement based radioactive wasteforms was investigated and linked to the hydraulic performance using mechanistic and empirical models. Within this context, the short-term developments of the compressive strength, porosity, and permeability of cement based matrices of varying water content were assessed. For matrices of low-water content, diffusion reaction is the dominant solidification mechanism due to super-saturation of CSH phases. As the water content increases, nucleation and growth reaction controls the process. The nature of the immobilization of inorganic ion exchangers and polymer modification in cement based matrices and its effect on the relative change in the compressive strength and permeability were investigated. The reductions in the solidification performance for cement-inorganic exchanger wasteforms were attributed to the excess amount of Ettringite in case of alumina exchangers and to the reduction in the hydrated phases formation for the rest of the inorganic exchangers. The permeability of the alumina-cement wasteform is fairly constant up to 16 % loading, whereas this behavior is noted up to 10 % loading of the rest of the inorganic exchanger and absent for organic exchangers-modified cement wasteforms.

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978-953-51-5411 核废料固化性能模型对比分析：废离子交换剂-水泥基废料形式

摘要 使用机械和经验模型研究了水泥基放射性废物的固化性能，并将其与水力性能联系起来。在此背景下，评估了不同含水量的水泥基基质的抗压强度、孔隙率和渗透率的短期发展。对于低水含量的基体，由于 CSH 相的过饱和，扩散反应是主要的凝固机制。随着水含量的增加，成核和生长反应控制了该过程。研究了水泥基基质中无机离子交换剂的固定化和聚合物改性的性质及其对抗压强度和渗透率的相对变化的影响。水泥-无机交换器废料形式的固化性能降低归因于氧化铝交换器中过量的钙矾石以及其余无机交换器中水合相形成的减少。氧化铝水泥废料的渗透率在高达 16% 的负载量下相当稳定，而这种行为在无机交换器其余部分的 10% 负载下被注意到，而有机交换器改性的水泥废料则不存在。