摘要
以沸石、硅灰和聚乙烯醇(PVA)纤维作为添加剂,使用传统硅酸盐水泥固化含Cs废离子交换树脂,并评估了固化体的抗压强度、抗冲击性能及抗浸出性能等指标。结果显示:固化体28d抗压强度为11.34 MPa,抗冲击性能良好;42d浸出率和累积浸出分数分别为2.35×10^(-4) cm/d和3.66×10^(-2) cm;固化体在浸泡、冻融及γ辐照后均能保持较好的性能,固化体各项指标均符合国标要求。研究发现,PVA纤维能有效增强固化体的抗冲击性能,并且在受到高剂量γ辐照后PVA纤维仍能有效增强固化体抗冲击性能;γ辐照后,固化体抗浸出性能变差,而添加沸石和硅灰则能有效增强固化体的抗浸出性能。
The solidification of radioactive Cs-containing ion-exchanging resins using ordinary Portland cement blending with zeolite,silica fume and polyvinyl alcohol（PVA）fiber was investigated.The compressive strength,impact resistance and leaching resistance of the cement waste forms were evaluated.The 28 dcompressive strength of the cement waste forms is 11.34 MPa,the 42 dleaching rate and cumulative leaching fraction of Cs＋are 2.35×10^-4 cm/d and 3.66×10^-2 cm respectively,and the cement waste forms meet the requirements of soaking,freezing,irradiation and impact resistance tests.The experimental results show that PVA fiber can enhance the impact resistance of the cement waste forms,and such enhancement lasts even afterγirradiation.However,the leaching rate of Cs~＋ becomes higher afterγirradiation,and zeoliteand silica fume can effectively reduce the leaching rate of Cs^＋.
出处
《原子能科学技术》
EI
CAS
CSCD
北大核心
2017年第10期1742-1748,共7页
Atomic Energy Science and Technology
基金
国家自然科学基金资助项目(51408296)
江苏省自然科学基金资助项目(BK20140607)
关键词
放射性废树脂
水泥固化
PVA纤维
沸石
硅灰
radioactive resin
cement solidification
PVA fiber
zeolite
silica fume
