摘要
针对高盐高碱低中水平放射性废液的特性,通过在普通硅酸盐水泥中掺入矿渣粉、粉煤灰和沸石作为矿物掺合料进行优化,获得固溶度大、低泌水率、流动性好、低核素浸出率的工艺配方,着重研究了水泥基材料组成、液灰比、盐浓度和促凝剂对扩展流动度、泌水率、凝结时间的影响规律。研究结果表明:矿物掺合料替代部分水泥可以发挥火山灰效应、减水效应,从而提高固化体对废液的包容量,改善拌合物的泌水、盐析现象;矿渣粉和粉煤灰有利于获得较高流动度的水泥拌合物,沸石可显著延长拌合物的凝结时间;随着高盐高碱低中水平放射性废液盐浓度的增加,扩展流动度减小,泌水率减小,凝结时间延长;三乙醇胺能有效缩短水泥固化的施工作业时间,掺量为1%时,PSFZ配方拌合物的初凝时间为262 min,终凝时间为302 min,可以满足施工作业要求。
By adding slag,fly ash and zeolite as mineral admixture modifying the ordinary Portland cement,a process recipe of big solid solubility,low exudation rate,good flow ability and low nuclide leaching rate was obtained. Influences of material composition,liquid-cement ratio,salt concentration and coagulant over extended fluidity,bleeding rate and setting time were investigated. Results show that:use mineral admixtures instead of cement can exert pozzolanic effect and water-reducing effect,improving the waste liquid capacity and bleeding and salting-out of the solidification form; the slag and fly ash can improve the fluidity of paste,zealot significantly prolong the setting time; As the salt concentration increases, the expansion of fluidity and bleeding rate decreases, the setting time extends;Triethanolamine can effectively shorten the construction of cement solidification time. When the content is1%,setting time of PSFZ shortened to 4 h 22 min,final setting time shortened to 5 h 2 min,satisfies the requirement of national standard.
出处
《辐射防护》
CAS
CSCD
北大核心
2014年第4期218-223,共6页
Radiation Protection
基金
核设施退役及放射性废物治理工程科研项目
江苏省生态环境材料重点建设实验室开放课题资助(EML201203)
关键词
水泥基固化体
模拟核废液
工艺参数
cement solidification form
simulated nuclear liquid waste
parameters
