Using alkali-activated dredge sludge ash-bentonite for low permeability cutoff walls: The engineering properties and micromechanism
文献类型：期刊论文
| 作者 | Hui, Xinminnan1,4; Wan, Yong2,4,5; He, Xingxing3,4; Li, Jiang-shan2,4,5; Huang, Xiao4; Liu, Lei2,4,5; Xue, Qiang2,4,5
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| 刊名 | ENVIRONMENTAL TECHNOLOGY & INNOVATION
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| 出版日期 | 2023-05-01 |
| 卷号 | 30期号:-页码:- |
| ISSN号 | 2352-1864 |
| 关键词 | Dredged sludge ash Alkali-activated Vertical barrier Micomechanism De-hydroxylation Sustainability |
| 英文摘要 | Although vertical cutoff walls can effectively contain groundwater pollution, vertical barriers constructed using conventional cement-bentonite-soil (CBS) mixtures exhibit poor permeability and produce considerable CO2 during cement production. The dredged sludge ash (DSA) has potential to be used as an eco-friendly source for vertical barriers building because of the remarkable pozzolonicity. In this study, a mixture consisting of MgO-activated dredged sludge ash (DSA) and bentonite was used to develop a low permeable MgO-activated DSA-bentonite-sand (MDBS) barrier material for application to vertical cutoff walls. The mechanical properties of MDBS and CBS mixtures were inves-tigated and the hydration products and microstructure were examined using scanning electron microscopy equipped with energy-dispersive X-ray spectroscopy (SEM-EDS), X-ray diffraction (XRD), and mercury intrusion porosimetry (MIP). The results showed that the MDBS mixture exhibited excellent impermeability: the hydraulic conductivity of MDBS cured for 60 d reached the minimum (1.83 x 10-8 cm/s), and considerably supe-rior to the common requirement (lower than 10-7 cm/s) for cutoff walls. The unconfined compressive strength of the MDBS cured for 60 d increased by approximately 112% com-pared to the samples cured for only 7 d. The hydration products in MDBS were mainly magnesium silicate hydrate and hydrotalcite, which filled the material pores more ef-fectively than the hydration products of CBS (calcium silicate hydrate calcium hydroxide and ettringite). The hydration products, bentonite swelling, and pore size distribution de-termined the MDBS mechanical properties and permeability. It is verified that activated dredge sludge ash can be used as an ideal cutoff walls material instead of cement.(c) 2023 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/). |
| 学科主题 | Biotechnology & Applied Microbiology ; Engineering ; Environmental Sciences & Ecology |
| 语种 | 英语 |
| 出版者 | ELSEVIER |
| WOS记录号 | WOS:000946391500001 |
| 源URL | [http://119.78.100.198/handle/2S6PX9GI/35265]  |
| 专题 | 中科院武汉岩土力学所 |
| 作者单位 | 1.University of Chinese Academy of Science, Beijing 100049, China 2.IRSM-CAS/HK PolyU Joint Laboratory on Solid Waste Science, Wuhan, China 3.State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing 100084, China 4.State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China 5.Hubei Province Key Laboratory of Contaminated Sludge and Soil Science and Engineering, Wuhan, 430071, China |
| 推荐引用方式 GB/T 7714 | Hui, Xinminnan,Wan, Yong,He, Xingxing,et al. Using alkali-activated dredge sludge ash-bentonite for low permeability cutoff walls: The engineering properties and micromechanism[J]. ENVIRONMENTAL TECHNOLOGY & INNOVATION,2023,30(-):-. |
| APA | Hui, Xinminnan.,Wan, Yong.,He, Xingxing.,Li, Jiang-shan.,Huang, Xiao.,...&Xue, Qiang.(2023).Using alkali-activated dredge sludge ash-bentonite for low permeability cutoff walls: The engineering properties and micromechanism.ENVIRONMENTAL TECHNOLOGY & INNOVATION,30(-),-. |
| MLA | Hui, Xinminnan,et al."Using alkali-activated dredge sludge ash-bentonite for low permeability cutoff walls: The engineering properties and micromechanism".ENVIRONMENTAL TECHNOLOGY & INNOVATION 30.-(2023):-. |
入库方式： OAI收割
来源：武汉岩土力学研究所
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