Model investigation of the low-carbon MgO-treated soil foundation based on CO2 overall carbonation
文献类型：期刊论文
| 作者 | Cai, Guanghua1,3,4; Liu, Songyu1; Zhong, Yuqing3; Poon, Chisun4; Li, Jiangshan2 |
| 刊名 | JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING
 |
| 出版日期 | 2023-11-01 |
| 卷号 | 15期号:11页码:2901-2916 |
| 关键词 | Model investigation Overall carbonation Reactive MgO Engineering properties Microscopic characteristics |
| ISSN号 | 1674-7755 |
| DOI | 10.1016/j.jrmge.2023.02.018 |
| 英文摘要 | The overall carbonation of MgO-admixed soil provides not only an efficient and environmentally friendly technique for improving soft ground but also a permanently safe solution for CO2 sequestration. To evaluate the carbon sequestration potential and promote the carbonation application in soil improvement, a laboratory-scale model investigation is designed under pressurized carbonation considering the influences of MgO dosage and CO2 ventilation mode (way). The temperature, dynamic resilience modulus, and dynamic cone penetration (DCP) were tested to assess the carbonation treatment effect. The physical, strength, and microscopic tests were also undertaken to reveal the evolution mechanisms of CO2 migration in the MgO-carbonated foundation. The results indicate that the temperature peaks of MgO-treated foundation emerge at similar to 20 h during hydration, but occur at a distance of 0-25 cm from the gas source within 6 h during carbonation. The dynamic resilience moduli of the model foundation increase by more than two times after carbonation and the DCP indices reduce dramatically. As the distance from the gas inlet increases, the bearing capacity, strength, and carbon sequestration decrease, whereas the moisture content increases. Compared to the end ventilation, the middle ventilation produces a higher carbonation degree and a wider carbonation area. The cementation and filling of nesquehonite and dypingite/hydromagnesite are verified to be critical factors for carbonation evolution and enhancing mechanical performances. Finally, the overall carbonation model is described schematically in three stages of CO2 migration. The outcomes would help to facilitate the practical application of CO2 sequestration in soil treatment. (C) 2023 Institute of Rock and Soil Mechanics, Chinese Academy of Sciences. Production and hosting 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/). |
| 资助项目 | National Science Foundation of China[41902286] ; Open Fund for the State Key Laboratory of Geomechanics and Geotechnical Engineering[SKLGME021029] ; CRSRI Open Research Program[CKWV20221015/KY] |
| WOS研究方向 | Engineering |
| 语种 | 英语 |
| WOS记录号 | WOS:001095804400009 |
| 出版者 | SCIENCE PRESS |
| 源URL | [http://119.78.100.198/handle/2S6PX9GI/39877]  |
| 专题 | 中科院武汉岩土力学所 |
| 通讯作者 | Cai, Guanghua; Liu, Songyu |
| 作者单位 | 1.Southeast Univ, Inst Geotech Engn, Sch Transportat, Nanjing 211189, Peoples R China 2.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Peoples R China 3.Nanjing Forestry Univ, Sch Civil Engn, Nanjing 210037, Peoples R China 4.Hong Kong Polytech Univ, Dept Civil & Environm Engn, Hong Kong 999077, Peoples R China |
| 推荐引用方式 GB/T 7714 | Cai, Guanghua,Liu, Songyu,Zhong, Yuqing,et al. Model investigation of the low-carbon MgO-treated soil foundation based on CO2 overall carbonation[J]. JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING,2023,15(11):2901-2916. |
| APA | Cai, Guanghua,Liu, Songyu,Zhong, Yuqing,Poon, Chisun,&Li, Jiangshan.(2023).Model investigation of the low-carbon MgO-treated soil foundation based on CO2 overall carbonation.JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING,15(11),2901-2916. |
| MLA | Cai, Guanghua,et al."Model investigation of the low-carbon MgO-treated soil foundation based on CO2 overall carbonation".JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING 15.11(2023):2901-2916. |
入库方式： OAI收割
来源：武汉岩土力学研究所
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