水合硅酸镁水泥对放射性核素铯的固定作用
Immobilization of Radionuclide Cs by Magnesium Silicate Hydrate Cement.
作者信息
Zhang Tingting, Li Tong, Zou Jing, Li Yimiao, Zhi Shiwei, Jia Yuan, Cheeseman Christopher R
机构信息
Faculty of Infrastructure Engineering, Dalian University of Technology, Dalian 116023, China.
Hebei Provincial Key Laboratory of Inorganic Nonmetallic, College of Materials Science and Engineering, North China University of Science and Technology, Tangshan 063210, China.
出版信息
Materials (Basel). 2019 Dec 30;13(1):146. doi: 10.3390/ma13010146.
The radionuclide cesium (Cs) was solidified using magnesium silicate hydrate (M-S-H) cement. The influence of Cs on the reaction of the M-S-H gel system was evaluated by measuring the compressive strength and microscopic properties of the solidified body. By testing the impact resistance, leaching resistance and freeze-thaw resistance of the solidified body, the immobilizing ability of Cs by the M-S-H cement was analyzed. Results indicate that Cs only slightly affects the reaction process of the M-S-H gel system, and only slows down the transformation rate of Mg(OH) into the M-S-H gel to a certain extent. The M-S-H cement exhibits superior performance in solidifying Cs. Both the leaching rate and cumulative leach fraction at 42 d were considerably lower than the national requirements and better than the ordinary Portland cement-solidified body. The curing effect of the M-S-H cement on Cs is mainly physical encapsulation and chemisorption of hydration products.
采用水合硅酸镁（M-S-H）水泥对放射性核素铯（Cs）进行固化。通过测量固化体的抗压强度和微观性能，评估了Cs对M-S-H凝胶体系反应的影响。通过测试固化体的抗冲击性、抗浸出性和抗冻融性，分析了M-S-H水泥对Cs的固化能力。结果表明，Cs仅对M-S-H凝胶体系的反应过程有轻微影响，仅在一定程度上减缓了Mg(OH)向M-S-H凝胶的转化率。M-S-H水泥在固化Cs方面表现出优异的性能。42 d时的浸出率和累积浸出分数均远低于国家要求，且优于普通硅酸盐水泥固化体。M-S-H水泥对Cs的固化效果主要是水化产物的物理包裹和化学吸附。
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