摘要
用偏高岭土、沸石及聚合物乳胶粉改性的碱矿渣复合水泥进行了模拟放射性焚烧灰固化处置研究。结果表明:模拟放射性焚烧灰包容量为40%时,水泥固化体性能满足国标GB14569.1—93要求。Cs+的第42d浸出率(GB7023—86,25℃)最低为1.32×10-4cm/d,累积浸出分数仅为0.041cm。28d抗压强度最低为45.6MPa,且后期强度增长依然较高。碱矿渣复合水泥凝结迅速,克服了焚烧灰中某些成分对水化造成的不利影响。偏高岭土、沸石之间存在协同效应,显著提高固化体的抗压强度,同时改善对核素离子的固化能力。乳胶粉在固化体内形成三维网状结构,改善固化体韧性及抗冲击性,引入的微小气泡优化孔结构、提高耐久性,但导致抗压强度下降,掺量以5%为宜。
Simulated radioactive incineration ash （SRIA） was solidified by alkali-activated slag composite cement （AASCC） modified by metakaolin, zeolite, and polymerpercentage is only 0. 041 cm. Also, the lowest 28 days compressive strength of solidified waste form is 45.6 MPa, and later strength growth is still high. The fast setting characteristic of AASCC overcomes effectively the disadvantageous influence caused by some components in SRIA on hydration of cement. The compressive strength of solidified waste is enhanced remarkably, and the ability of immobilizing radionuclide ions is also improved. This is mainly due to synergistic effect between metakaolin and zeolite. Poly-mer modification also improves the performance of solidified waste form significantly. The three-dimensional polymer network structure formed by emulsion powder in solidi-fled waste form enhances its toughness and impact resistance, and the durability is improved by reducing interconnected pores and optimizing pore structure. However, italso results in reduction in compressive strength. Thus, it is concluded that the suitable dosage percentage is 5 %.
出处
《原子能科学技术》
EI
CAS
CSCD
北大核心
2010年第4期400-407,共8页
Atomic Energy Science and Technology
基金
"十一五"军品配套研制项目资助(JPPT-115-2-1080)
关键词
碱矿渣复合水泥
模拟放射性焚烧灰
固化
乳胶粉
偏高岭土
alkail activated slag composite cement
simulated radioactive incineration ash
solidification
emulsion powder
metakaolin
