摘要
用正交试验确定合成地聚物水泥的最优配方,以单因素试验说明改变沸石的质量分数和粒度对地聚物水泥机械性能的影响。综合N2吸附测试,XRD,IR和SEM分析说明添加沸石合成的地聚物水泥水化28 d后,有结晶的P型沸石和方沸石出现,无定形物质也增多,并且孔隙率和平均孔径减小,体系致密度增加。证明了在地聚物水泥中添加天然沸石能充当微集料,改善孔结构,促进地聚物水泥水化程度,提高机械性能。沸石改性粉煤灰地聚物水泥固化含Sr的模拟废液,其浸出实验结果满足国家规定的要求。
Geopolymers have a zeolite-like structure and are the precursors of zeolite. They are expected to be a kind of good materials for solidification of radwaste. The optimal feeding proportion for synthesis of geopolymers was obtained by orthogonal experiments. Single factor experiments were used to explain the impact of different mass fraction and granularity of zeolite to the mechanical performance of the geopolymers. The geopolymer products were characterized by XRD, IR, SEM, and N2 adsorption measurements. The following phenomena were observed in 28 d hydrated polymers： the occurrence of zeolite P and analicime-C, the increase in amorphous phase proportion, and the decrease in both the total pore volume and the average pore diameter. We conclude that adding zeolite to geopolymers can improve the structure of the pores and accelerate the hydration. Simulating strontium waste solutions are solidified by this geopolymers, and its leaching rates are measured in different times according to the GB14569. 1-1993.
出处
《核化学与放射化学》
EI
CAS
CSCD
北大核心
2008年第3期134-141,共8页
Journal of Nuclear and Radiochemistry
基金
"十一五"国家科技支撑计划子课题(2006BAF02A24)
