摘要
研究了富铝碱矿渣粘土矿物复合胶凝材料(RAAASCM)基模拟放射性泥浆固化体的机械强度、干缩性及抗浸出性能。结果表明:模拟泥浆掺量、胶砂比对固化体的抗压强度、抗冲击性影响较大,尤其是模拟泥浆的影响更为明显。当胶砂比为1∶1 ,水灰比为0 .45 ,模拟泥浆掺量为2 0 %时,固化体抗压强度及抗冲击性均满足GB 1 45 69.1 93要求。干缩主要发生在自固化体置于相对湿度为60 %±5 %的环境养护的2 0d内。模拟泥浆的掺入对富铝碱矿渣粘土矿物复合胶凝材料基固化体干缩性的影响较之普通硅酸盐水泥基固化体小。当胶砂比为1∶1 ,模拟泥浆掺量1 0 %～2 0 %时,两种基材固化体的干缩率相近。富铝碱矿渣粘土矿物复合胶凝材料基固化体的抗浸出性较普通硅酸盐水泥基固化体优越。固化体对Sr2 +的束缚比对Cs+的束缚牢固。
The properties, mechanical strength, drying shrinkage and leaching resistance were studied of simulated radioactive slurry waste forms with high alumina alkali-activated slag clay mineral composite cement (RAAASCM).The results show that the dosage of simulated radioactive slurry and the ratio of cement to sand, especially the former, have significant effect on the compressive strength and impact resistance of RAAASCM based waste forms. The compressive strength and impact resistance of the waste forms with 20% wt. simulated radioactive slurry meet the requirements of GB 14569.1-93, when cement sand ratio is 1∶1 and water cement ratio is 0.45.Drying shrinkag of waste forms mainly occur in the first 20 days when being placed at relative humidity of 60%±5%.RAAASCM based waste forms is less sensitive than ordinary portland cement (OPC) based waste forms in term of drying shrinkage caused by incorporation of simulated slurry. When cement sand ratio is 1∶1 and the dosage of simulated radioactive slurry is in the range of 10%～20% wt,the drying shrinkage of the two kinds of matrix is approximately equal. The RAAASCM based waste forms show much better performance in leaching resistance than the OPC based waste forms. Sr 2+ is more strongly bound than Cs + in the waste forms.
出处
《辐射防护》
CAS
CSCD
北大核心
2005年第2期102-108,共7页
Radiation Protection
基金
国家自然科学基金委员会与中国工程物理研究院联合基金 (编号 :10 376 0 2 8)
中国工程物理研究院核物理与化学研究所资助课题
