固化Zn、Cl污染砂土的强度及浸出特性

发布时间：2018-01-04 07:38

本文关键词：固化Zn、Cl污染砂土的强度及浸出特性　出处：《东南大学学报(自然科学版)》2016年S1期 　论文类型：期刊论文

【摘要】：为研究新型固化剂固化稳定复合Zn、Cl污染砂土的效果,依托某企业搬迁遗留场地修复工程开展现场中试试验,并结合室内无侧限抗压强度试验、pH测试以及毒性浸出等试验,探讨修复土物理力学、浸出等特性与固化剂成分、养护龄期的变化规律,分析比较了不同固化剂的固化稳定化效果.试验结果表明,固化土干密度较污染素土增加,增幅达11%~12%;固化土强度随养护龄期和固化剂掺量增加而增长,其中28 d龄期6%KMP掺量的固化土无侧限抗压强度较未固化土高6.17倍;掺加固化剂会显著提升污染土pH值,其中掺加GGBS-Mg O的固化土各龄期pH值均略大于掺加KMP的固化土;2种固化剂对Zn、Cl离子的稳定效果有所差别,总体而言,2种固化剂均能有效地稳定土壤中的Zn、Cl离子.
[Abstract]:In order to study the effect of the new curing agent solidified and stabilized composite ZnCl-contaminated sand soil field pilot test was carried out based on the site restoration project of a certain enterprise and the unconfined compressive strength test was carried out in the laboratory. The pH test and toxic leaching test were used to study the physical mechanics, leaching properties, curing agent composition and curing age of remediation soil. The results show that the dry density of the cured soil is higher than that of the contaminated soil, and the increase is as high as 11% and 12% respectively. The strength of solidified soil increased with the increase of curing age and the amount of curing agent, and the unconfined compressive strength of cured soil was 6.17 times higher than that of unsolidified soil at 28 days of age. The pH value of contaminated soil increased significantly with the addition of curing agent, and the pH value of solidified soil added with GGBS-Mg O was slightly higher than that of solidified soil with KMP. The effect of the two curing agents on the stabilization of ZnOCl ~ (2 +) ions was different. In general, the two kinds of curing agents could effectively stabilize the Zn ~ (+) ~ (2 +) ions in soil.
【作者单位】：东南大学岩土工程研究所;东南大学江苏省城市地下工程与环境安全重点实验室;江苏圣泰环境科技股份有限公司;
【基金】：国家自然科学基金重点资助项目(41330641);国家自然科学基金资助项目(51278100,41472258) 国家高新技术研究发展计划(863计划)资助项目(2013AA06A206) 江苏省自然科学基金杰出青年基金资助项目(2012022)
【分类号】：TU43;X53
【正文快照】： 近年来,许多企业都逐渐进行了关停并转、退城进远郊工作,企业搬迁后所遗留下的场地成为了工业污染场地,对周边生态环境造成严重影响[1].以南京市为例,其典型工业产区土壤中锌(Zn)、铅(Pb)、镉(Cd)和砷(As)等元素含量都明显超标[2].这些有毒化学物质可以通过饮水、食物等途径被

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