添加剂对模拟含氟放射性废液水泥固化性能的影响

Influences of Additives on Performances of Cementation of Simulated Radioactive Fluoride Liquid Wastes

摘要: 采用沸石、蛭石、硅灰、石英砂作为添加剂对模拟含氟放射性废液(主要含有Cs⁺、Sr²⁺、F^-等)水泥固化性能的影响进行了研究。通过添加不同的添加剂，测定水泥浆的初终凝时间、流动度和温升；测定固化体养护28 d后的抗压强度及浸泡、冻融试验后的抗压强度，并进行了抗冲击试验和模拟核素浸出试验。通过对比，得到了满足模拟含氟放射性废液水泥固化的配方，该配方制成的水泥固化试块性能达到了GB 14569.1—2011的要求。

Abstract: The influences of additives with zeolite, vermiculite, silica fume and quartz sand on the performances of the cementation of simulated radioactive fluoride liquid wastes containing Cs⁺, Sr²⁺, F^-, etc. were studied. Different additives were added into the cement formulation, then the setting time, fluidity and temperature-rising of the cement slurry were investigated. And the 28 d compressive strength of the cemented waste form and strength losses after water/freezing resistance tests was investigated. The shock resistance and leaching tests were also carried out. Through series of comparison, the study obtains the cement formulation which can satisfy cementation of simulated radioactive fluoride liquid wastes. The performances of the cemented waste form can meet the demands of GB 14569.1—2011.