Strength characteristics and microscopic mechanism of activated MgO-modified biochar carbonization curing Zn2+ polluted soil
文献类型：期刊论文
| 作者 | Zhang, Shuguang1,3; Zhang, Mingzhi1,3; Li, Jiangshan2; Song, Yu1,3 |
| 刊名 | CONSTRUCTION AND BUILDING MATERIALS
 |
| 出版日期 | 2024-10-25 |
| 卷号 | 449页码:11 |
| 关键词 | Zn2+ contaminated soil Modified biochar Carbonized and cured Strength Properties Microstructure |
| ISSN号 | 0950-0618 |
| DOI | 10.1016/j.conbuildmat.2024.138341 |
| 英文摘要 | Conventional curing agents are associated with environmental impacts when treating Zn(2+)contaminated soils. To overcome this limitation. In this study, we study a new type of MgO-CSB curing agent. Namely, corn stover biochar is modified with activated MgO. Modification of corn stover biochar using activated MgO, and carbonation curing was adopted to solidify/stabilize the Zn(2+)contaminated soil. The curing efficacy of Zn(2+)contaminated soil under modified mass ratio, Zn2+ concentration, carbonation time, and curing agent incorporation was investigated. The findings indicate that the optimal adsorption efficiency was attained following the co-pyrolytic modification of activated MgO with corn stover biochar at 700 degrees C. The optimal modified mass ratios for curing were found to be 1:1, 1:2, and 2:1 at Zn2+ concentrations of 0.1 %, 0.5 %, and 1 %, respectively. At a lower Zn2+ concentration, peak carbonization intensity is achieved at 0.5 hours, while at a 1 % Zn2+ concentration, peak intensity is reached at 1 hour. The deformation modulus of the cured soil increases as the curing agent dosage increases and the soil aggregates become denser. SEM results show that: The carbonization and curing reaction products are mainly nesquehonite and Mg (OH)(2). The internal structural damage of the cured soil was aggravated by the increase in Zn(2+)concentration, and the generation of nesquehonite and Mg (OH)(2) was inhibited; The carbonation time was extended to 1 h and the soil structure stability was enhanced. |
| 资助项目 | National Natural Science Foundation of China[4206070032] ; National Natural Science Foundation of China[42262030] ; Henan Science and Technology R&D Program Joint Fund[25200810005] ; Guangxi Key Science and Technology Innovation Base on Karst Dynamics[KDL Guangxi202303] ; Open subject of Guangxi Key Laboratory of Geotechnical Mechanics and Engineering[Guikeyan 2023-XT-02] |
| WOS研究方向 | Construction & Building Technology ; Engineering ; Materials Science |
| 语种 | 英语 |
| WOS记录号 | WOS:001318406200001 |
| 出版者 | ELSEVIER SCI LTD |
| 源URL | [http://119.78.100.198/handle/2S6PX9GI/42631]  |
| 专题 | 中科院武汉岩土力学所 |
| 通讯作者 | Song, Yu |
| 作者单位 | 1.CAGS, Inst Karst Geol, Key Lab Karst Dynam MNR & Guangxi, Guilin 541004, Peoples R China 2.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Peoples R China 3.Guilin Univ Technol, Sch Civil Engn, Guilin 541004, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zhang, Shuguang,Zhang, Mingzhi,Li, Jiangshan,et al. Strength characteristics and microscopic mechanism of activated MgO-modified biochar carbonization curing Zn2+ polluted soil[J]. CONSTRUCTION AND BUILDING MATERIALS,2024,449:11. |
| APA | Zhang, Shuguang,Zhang, Mingzhi,Li, Jiangshan,&Song, Yu.(2024).Strength characteristics and microscopic mechanism of activated MgO-modified biochar carbonization curing Zn2+ polluted soil.CONSTRUCTION AND BUILDING MATERIALS,449,11. |
| MLA | Zhang, Shuguang,et al."Strength characteristics and microscopic mechanism of activated MgO-modified biochar carbonization curing Zn2+ polluted soil".CONSTRUCTION AND BUILDING MATERIALS 449(2024):11. |
入库方式： OAI收割
来源：武汉岩土力学研究所
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