摘要
采用生石灰激发赤泥-粉煤灰-水泥对Cu^(2+)污染高岭土进行固化处理,对采用不同配比的赤泥和粉煤灰固化7 d后的Cu^(2+)污染高岭土试件的无侧限抗压强度、浸出率和电化学阻抗谱进行测试。试验结果表明,当赤泥和粉煤灰质量比为7∶3时,固化体的无侧限抗压强度最大,Cu^(2+)浸出率最小,电化学阻抗谱法对固化效果的评价与强度和浸出率测试结果一致,说明电化学阻抗谱法是一种评价污染土固化效果的有效方法。
To investigate the effect of different ratios of curing agent on electrochemical impedance characteristics of solidified kaolin and evaluate the feasibility of curing effect,the curing effect of different ratio of red mud and fly ash as curing agent to cure Cu^(2+)contaminated kaolin was studied systematically.Quicklime was used to stimulate the solidification of Cu^(2+)polluted kaolin using red mud-fly ash-cement.The unconfined compressive strength,leaching rate,and electrochemical impedance of Cu^(2+)contaminated kaolin specimens that solidified with different proportions of red mud and fly ash for 7 days were tested and studied.The test results show that when the mass ratio of red mud and fly ash is 7∶3,the unconfined compressive strength of the solidified body is the largest,and the Cu^(2+)leaching rate is the smallest.The evaluation of the curing effect by electrochemical impedance spectroscopy is consistent with the test results of strength and leaching rate,indicating that electrochemical impedance spectroscopy is an effective method for evaluating the curing effect of contaminated soil.
作者
王景霞
何斌
牛世伟
韩鹏举
WANG Jing-xia;HE Bin;NIU Shi-wei;HAN Peng-ju(College of Civil Engineering,Taiyuan University of Technology,Taiyuan 030024,China)
出处
《科学技术与工程》
北大核心
2021年第12期5054-5059,共6页
Science Technology and Engineering
基金
国家自然科学基金(41807256)
山西省高等学校科技创新项目(2019L0219)
山西省人才专项项目(优秀人才科技创新项目)(2019)。
关键词
重金属污染土
赤泥
粉煤灰
固化
电化学阻抗谱
heavy metal contaminated soil
red mud
fly ash
solidification
electrochemical impedance spectroscopy
