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[1]张伟,陈新民.偏高岭土-水泥固化Cd污染土的工程特性[J].南京工业大学学报(自然科学版),2018,40(04):71-77.[doi:10.3969/j.issn.1671-7627.2018.04.012]
 ZHANG Wei,CHEN Xinmin.Engineering characteristics of Cd contaminated soil solidified/stabilized by the metakaolin-cement solidifier[J].Journal of NANJING TECH UNIVERSITY(NATURAL SCIENCE EDITION),2018,40(04):71-77.[doi:10.3969/j.issn.1671-7627.2018.04.012]
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偏高岭土-水泥固化Cd污染土的工程特性()
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《南京工业大学学报(自然科学版)》[ISSN:1671-7627/CN:32-1670/N]

卷:
40
期数:
2018年04期
页码:
71-77
栏目:
出版日期:
2018-07-20

文章信息/Info

Title:
Engineering characteristics of Cd contaminated soil solidified/stabilized by the metakaolin-cement solidifier
文章编号:
1671-7627(2018)04-0071-07
作者:
张伟陈新民
南京工业大学 交通运输工程学院,江苏 南京 210009
Author(s):
ZHANG WeiCHEN Xinmin
College of Transportation Science & Engineering,Nanjing Tech University,Nanjing 210009,China
关键词:
固化/稳定技术(S/S) 偏高岭土 Cd污染土 强度特性 浸出特性
Keywords:
solidification/stabilization(S/S) metakaolin Cd contaminated soil strength characteristic leaching characteristic
分类号:
TU42;X53
DOI:
10.3969/j.issn.1671-7627.2018.04.012
文献标志码:
A
摘要:
采用偏高岭土-水泥体系对Cd污染土固化/稳定处理。通过无侧限抗压强度试验和毒性浸出试验,探讨Cd2+含量和偏高岭土掺量对固化污染土强度和浸出特性的影响。结果表明:固化土体的无侧限抗压强度随着养护龄期的增加而呈不同程度的对数增长趋势; 掺加偏高岭土后,固化土体随着Cd2+含量的增加,强度逐渐减小,无明显临界效应; 各种Cd2+含量下,偏高岭土的掺入对固化土体的强度均有提高,且掺量达到2%时出现峰值; 毒性浸出试验结果表明掺入偏高岭土对污染土中Cd2+具有更优异固化稳定效果; 无论从固化效果还是从经济性出发,偏高岭土的最佳掺量均在2%左右,且可适当减少固化剂用量。
Abstract:
The metakaolin-cement system is used to solidify/stabilize Cd contaminated soil.The effects of Cd2+ concentration and metakaolin(MK)content on strength and leaching characteristics of solidified contaminated soil are investigated by unconfined compressive strength tests and toxicity leaching tests.Unconfined compressive strength of solidified soil can appear a logarithm increase while curing period is increasing; with the increase in Cd2+ concentration,the strength of the solidified soil gradually decreases with the addition of metakaolin,but there is no obvious critical effect.Under different Cd2+ concentrations,the strength of the solidified soil is increased with the addition of metakaolin,and the peak value appears when the mixing ratio is 2%.The toxicity leaching test results show that the addition of metakaolin exhibits more excellent curing effect of stability on the Cd2+ contaminated soil.No matter from the curing effect or from the economy,the optimum mixing ratio of MK is about 2%,and the dosage of curing agent can be properly reduced.

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备注/Memo

备注/Memo:
收稿日期:2017-03-16
作者简介:张伟(1991—),男,安徽合肥人,硕士,主要研究方向为环境岩土工程; 陈新民(联系人),教授,E-mail:xmchen@njtech.edu.cn.
引用本文:张伟,陈新民.偏高岭土-水泥固化Cd污染土的工程特性[J].南京工业大学学报(自然科学版),2018,40(4):71-77..
更新日期/Last Update: 2018-07-30