Abstract The design of engineered barrier systems for high-level radioactive waste isolation requires the use of cement-based materials. Small-scale surface reactivity interface experiments were designed to perform a reference laboratory study. It simulated granitic groundwater infiltration through cement mortar/bentonite (CB) binary columns. The tests ran duplicated over 6 and 18 months and included low-pH, CEM I and CEM II ordinary Portland cement mortars in contact with bentonite. After the experiments, the materials were analysed using scanning electron microscopy attached to energy dispersive energy X-ray analysis (EDX), surface mineralogy using grazing incidence X-ray diffraction configurations, specific surface area and effluent chemistry. EDX chemical profiles measured from CB interface contact reproduced, in 100 μm to 1 mm thickness, a characteristic geochemical Mg perturbation in the bentonite and calcite precipitation in cement materials. These processes are known to be developed in 10–15-years within

中文翻译：

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高 pH/低 pH 普通波特兰水泥砂浆对压实膨润土表面的影响：粘土屏障性能的应用

摘要 用于高放射性废物隔离的工程屏障系统的设计需要使用水泥基材料。小规模表面反应性界面实验旨在进行参考实验室研究。它模拟了花岗岩地下水通过水泥砂浆/膨润土 (CB) 二元柱的渗透。测试在 6 个月和 18 个月内重复进行，包括与膨润土接触的低 pH、CEM I 和 CEM II 普通波特兰水泥砂浆。实验结束后，使用扫描电子显微镜对材料进行了分析，该显微镜与能量色散能量 X 射线分析 (EDX)、使用掠入射 X 射线衍射配置的表面矿物学、比表面积和流出物化学有关。从 CB 界面接触处测量的 EDX 化学曲线再现，厚度为 100 μm 至 1 mm，膨润土中的特征地球化学镁扰动和水泥材料中的方解石沉淀。众所周知，这些过程将在 10 到 15 年内开发出来。