Effect of long-term acid attack on impermeability and microstructure of compacted cement-bound soils
文献类型：期刊论文
| 作者 | Dong, Zhiwei; Wan, Yong; Wang, Ping; Chen, Zhen; He, Xingxing; Hui, Xinminnan |
| 刊名 | ENVIRONMENTAL TECHNOLOGY
 |
| 出版日期 | 2022-07-07 |
| ISSN号 | 0959-3330 |
| 关键词 | Compacted cement-treated soil permeability coefficient acid solution long-term erosion microstructure |
| 英文摘要 | Compacted cement-bound soils (CCS) are widely used as leakage barriers around solid waste landfills and contaminated sites. However, a study of its long-term reliability in an acidic environment is relatively scarce. A 3-year-long experimental study on the changes in permeability coefficient and microstructure of CCS under acid attack was conducted, from which the following conclusions can be drawn: the permeability coefficient of CCS under weak acid (pH = 5.00) attack decreased progressively with time, from 4.90 x 10(-8) cm/s at the beginning to 6.70 x 10(-10) cm/s after 3 years. Under strongly acidic environments with pH values of 2.65 and 3.65, the permeability coefficients of CCS initially decreased and then increased with time, reaching 6.70 x 10(-5) and 9.37 x 10(-8) cm/s, respectively. The degradation effect of a weak acid (pH = 5.00) on the hydration products of cement was mild as a large amount of hydration products (e.g. C-S-H shaped in short fibrous) remained in the pores of CCS after 3 years of immersion. However, strong acid caused an obvious degradation effect on the hydration products, which almost disappeared after 3 years of immersion. Based on the study data, a unified mathematical model was developed to correlate the permeability coefficient of CCS, immersion time and acidic solution pH value. Furthermore, a quantitative expression function between the service life of CCS and solution pH value was established. |
| 学科主题 | Environmental Sciences & Ecology |
| 语种 | 英语 |
| 出版者 | TAYLOR & FRANCIS LTD |
| WOS记录号 | WOS:000825797300001 |
| 源URL | [http://119.78.100.198/handle/2S6PX9GI/35300]  |
| 专题 | 中科院武汉岩土力学所 |
| 作者单位 | 1.Chinese Academy of Sciences; Tsinghua University 2.Chinese Academy of Sciences; Wuhan Institute of Rock & Soil Mechanics, CAS; 3.Chinese Academy of Sciences; University of Chinese Academy of Sciences, CAS; |
| 推荐引用方式 GB/T 7714 | Dong, Zhiwei,Wan, Yong,Wang, Ping,et al. Effect of long-term acid attack on impermeability and microstructure of compacted cement-bound soils[J]. ENVIRONMENTAL TECHNOLOGY,2022. |
| APA | Dong, Zhiwei,Wan, Yong,Wang, Ping,Chen, Zhen,He, Xingxing,&Hui, Xinminnan.(2022).Effect of long-term acid attack on impermeability and microstructure of compacted cement-bound soils.ENVIRONMENTAL TECHNOLOGY. |
| MLA | Dong, Zhiwei,et al."Effect of long-term acid attack on impermeability and microstructure of compacted cement-bound soils".ENVIRONMENTAL TECHNOLOGY (2022). |
入库方式： OAI收割
来源：武汉岩土力学研究所
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