水泥稳定/固化有机粘土污染土壤中铅的特性。
Stabilization/solidification characteristics of organic clay contaminated by lead when using cement.
机构信息
Research Center of Coastal and Urban Geotechnical Engineering, Zhejiang University, Hangzhou, 310058, China; Ningbo Institute of Technology, Zhejiang University, Ningbo, 315100, China; Department of Civil and Environmental Engineering, Northwestern University, Evanston, 60208, USA.
Department of Civil and Environmental Engineering, Northwestern University, Evanston, 60208, USA.
出版信息
J Hazard Mater. 2019 Jan 15;362:132-139. doi: 10.1016/j.jhazmat.2018.09.010. Epub 2018 Sep 5.
Research about cement treated soil has examined various characteristics of strengthened and stabilized soil, but has mainly focused on either the unconfined compressive strength or potentially toxic element (PTE) stabilizing results respectively in response to cement dosing. This study investigates how factors including cement concentration, lead concentration, humic/fulvic acid content and curing age affect these two geotechnical and environmental characteristics. A laboratory study was conducted to measure unconfined compressive strength, and lead leaching under several test conditions. Knowing that humic acid and fulvic acid can weaken cementation in cement treated soil but can stabilize PTEs such as lead by different chemical reactions, it was found that the acids generally reduce lead stabilization in cement treated soil. In addition, the stabilized strength reaches a peak at a specific lead content in soil. Finally, scanning electron microscopy was used to observe more detailed changes and mechanisms.
关于水泥土的研究已经检验了强化和稳定土的各种特性，但主要侧重于无侧限抗压强度或潜在有毒元素（PTE）的稳定结果，分别针对水泥剂量。本研究调查了水泥浓度、铅浓度、腐殖酸/黄腐酸含量和养护龄期等因素如何影响这两个岩土工程和环境特性。进行了一项实验室研究，以测量在几种测试条件下的无侧限抗压强度和铅浸出。由于知道腐殖酸和黄腐酸可以削弱水泥土中的胶结作用，但可以通过不同的化学反应稳定 PTE 如铅，因此发现酸通常会降低水泥土中铅的稳定性。此外，稳定强度在土壤中特定的铅含量达到峰值。最后，扫描电子显微镜用于观察更详细的变化和机制。
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