Solidification characteristics and mechanisms of cement treated Pb/Zn contaminated soils from a mining site in Hunan Province, China
Solidification characteristics and mechanisms of cement treated Pb/Zn contaminated soils from a mining site in Hunan Province, China
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DOI：
10.1504/ijep.2016.10000740
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发表时间：
2016-10
影响因子：
0.7
通讯作者：
Meng Zhou;Hao-liang Wu;Yan-jun Du;Yucheng Yi
中科院分区：
文献类型：
--
作者：
Meng Zhou;Hao-liang Wu;Yan-jun Du;Yucheng Yi
本文介绍了一项通过使用普通波特兰水泥 (OPC) 来稳定受重金属污染的矿场土壤的研究。本研究的目的是通过毒性特征浸出程序（TCLP）、酸中和能力（ANC）试验探讨粘结剂含量（%）和污染土壤的养护龄期对污染土壤的毒性和强度特性的影响。通过顺序萃取程序（BCR）、无侧限压缩试验（UCT）、X射线衍射（XRD）和扫描电子显微镜（SEM）程序来分析凝固机制。结果表明，随着固化时间从0 d增加到28 d，OPC稳定污染土壤发生了一些变化：1）Zn和Pb的淋失减少； 2）ANC（β）增加； 3）交换性Zn、Pb减少； 4）残留含量增加； 5）强度提高。
This paper presents a study on the stabilisation of mine soils from a mining site contaminated with heavy metals through the use of ordinary Portland cement (OPC). The aim of this study was to explore the effects of binder content (%), and the curing age of contaminated soils on the toxicity and strength properties of the contaminated soils using toxicity characteristic leaching procedure (TCLP), acid-neutralising capacity (ANC) test. Sequential extraction procedure (BCR), unconfined compression test (UCT), X-ray diffraction (XRD) and scanning electron microscopy (SEM) procedures were carried out to analyse the solidification mechanisms. The results showed that as the curing time was increased from 0 d to 28 d, OPC stabilised contaminated soil underwent several changes: 1) leaching of Zn and Pb decreased; 2) ANC (β) increased; 3) exchangeable Zn and Pb decreased; 4) residual contents increased; 5) strength improved.