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为了确认γ辐照对改性钠基膨润土的影响,拓展高放地质处置缓冲材料性能评价范围,以内蒙古高庙子改性钠基膨润土为研究对象,利用红外光谱分析仪、同步热分析仪和X射线衍射仪分析了不同γ辐照剂量(1000、2000、3000、4000和5000 k Gy)对改性钠基膨润土性能和微观结构的影响。结果表明:在5000 k Gy大剂量γ辐照后,高庙子改性钠基膨润土中某些官能团发生了少量的化学转变,耐热性能有所提高,但对钠基膨润土中的层间水和吸附水影响不大;另外其微观结构变化不明显,只是晶胞尺寸有所减小;总体而言,高庙子钠基膨润土在大剂量γ辐照环境中稳定性是良好的。
In order to confirm the influence of γ irradiation on the modified sodium bentonite and to expand the performance evaluation range of high-lying geological disposal cushioning material, the modified sodium bentonite from Gaomiaozi in Inner Mongolia was used as the research object. By using infrared spectrometer, synchronous thermal analyzer and The effects of different doses of γ radiation (1000, 2000, 3000, 4000 and 5000 k Gy) on the properties and microstructure of modified sodium bentonite were analyzed by X-ray diffractometer. The results showed that some chemical functional groups of some modified functional groups in Gaomiaozi modified sodium-based bentonite had a small amount of chemical transformation after the high-dose γ-irradiation of 5000 kGy, and the heat resistance was improved. However, interlayer water And adsorbed water has little effect. In addition, its microstructure does not change obviously, but the unit cell size decreases. In general, the stability of GAOJI Na-bentonite is good in high-dose γ-irradiation environment.