摘要
为探究水泥污染土固化率与孔隙特征之间的关系,利用水泥作为固化剂对锌污染红黏土进行固化稳定处理,对不同养护期人工污染土的毒物浸出毒性、微观孔隙及生成物成分进行研究。结果表明:重金属浸出量随锌离子浓度增加总体呈上升趋势,固化率则相反。固化土中固化率与总孔隙率相关性最高且呈负相关,0.840~8.400μm的孔隙体积分数与总孔隙率相关性最高且呈正相关;随着离子浓度增加,0.840~8.400μm的孔隙体积分数与总孔隙率占比增加而固化率下降;水泥掺量10%时,固化土内部水化反应生成络合物CaZn 2(OH)6 2H 2O进而填充孔隙,使内部结构更密实。
An experimental investigation on toxic leaching quality,microscopic pore distribution and product composition of cement-treated zinc-contaminated soil was presented.The results showed that the solidification rate increased with the increased cement content,and the solidification rate of different cement content significantly was affected by curing time.An optimized solidification rate was gained when curing time was 28 d at lower cement content,and the solidification rate decreased with the increasing of curing time at higher cement content.The growth of the heavy metal leaching increased with the increasing zinc ion concentration and the solidification rate showed a opposite trend.The test results of mercury intrusion experiment and the grey correlation analysis result demonstrated that the correlation between the solidification rate and total porosity was the highest but negative,the correlation between the pores and total porosity was the highest and positive at the range of 0.840~8.400μm.With the increase of zinc ion concentration,the pore volume fraction and the total porosity ratio increased,but the solidification rate decreased.When the cement content was 10%,the internal hydration reaction of the sample structure formed calcium-zinc complex CaZn 2(OH)6 2H 2O and fulfilled the pores,making the internal structure more compact.
作者
张聪慧
申向东
樊浩伦
原奇
ZHANG Cong-hui;SHEN Xiang-dong;FAN Hao-lun;YUAN Qi(College of Water Conservancy and Civil Engineering,Inner Mongolia Agricultural University,Hohhot 010018,China;Inner Mongolia Comprehensive Traffic Science Research Institute Co.,Ltd,Hohhot 010018,China)
出处
《环境工程》
CAS
CSCD
北大核心
2019年第11期172-176,131,共6页
Environmental Engineering
基金
国家自然科学基金项目(51569021,51769025)
关键词
固化/稳定技术
锌污染红黏土
固化率
压汞试验
XRD
solidification/stabilization technology
zinc contaminated red clay
curing rate
mercury intrusion test
XRD
