Strengthening effect of nano-SiO2 on microbial induced carbonate precipitation (MICP) solidified sediment: Macro- and micro-analysis
文献类型：期刊论文
| 作者 | Xu, Fengli; Wang, Dongxing1,2,5; Xu, Xueyong3; Xiao, Zunqun4 |
| 刊名 | GEOMECHANICS FOR ENERGY AND THE ENVIRONMENT
 |
| 出版日期 | 2024-06-01 |
| 卷号 | 38页码:16 |
| 关键词 | Nano-SiO2-assisted MICP UCS Strengthening mechanisms Cementation Adsorption |
| ISSN号 | 2352-3808 |
| DOI | 10.1016/j.gete.2024.100555 |
| 英文摘要 | Sediment consolidation via microbial induced carbonate precipitation (MICP) aligns with the principles of sustainable development in resource utilization. This study aimed to explore the solidification potential and mechanisms of integrating nano-SiO2 as a supplementary material in MICP-treated sediment under various conditions, employing permeability, unconfined compression strength (UCS), X-ray diffraction (XRD), scanning electron microscopic (SEM), and adsorption techniques. The results demonstrated a reduction in permeability and an increase in UCS in sediment treated with <= 0.1% nano-SiO2-assisted MICP. The factors contributing to solidification potential followed a specific order: Ca2+ concentration > OD600> nano-SiO2 dosage > biochemical reaction time. When combined with MICP, nano-SiO2 at concentrations below 0.05% promoted the transformation from aragonite to calcite. Furthermore, nano-SiO2 triggered the creation of early-stage C-S-H gels, aged viscous-like silicate gels, and spurrite [Ca-5(SiO4)(2)CO3] to cement the sediment. Additionally, the micro filling of nano-SiO2, minerals, and gel phases significantly bolstered the sediment's strength. Finally, the impressive adsorption capacity of nano-SiO2 for Ca2+ (q(m) = 0.26 mol/g) alleviated the toxicity of excessive Ca2+ on urease activity, thereby facilitating urea hydrolysis and CaCO3 nucleation. The synergistic effect of nano-SiO2 with MICP, involving cementation, filling, nucleation, and mitigation of Ca2+ toxicity, provides valuable insights for the sediment reinforcement applications. |
| WOS研究方向 | Energy & Fuels ; Engineering ; Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:001224412900001 |
| 出版者 | ELSEVIER |
| 源URL | [http://119.78.100.198/handle/2S6PX9GI/41363]  |
| 专题 | 中科院武汉岩土力学所 |
| 通讯作者 | Wang, Dongxing |
| 作者单位 | 1.Wuhan Inst Technol, Xingfa Sch Min, Wuhan 430205, Hubei, Peoples R China 2.Wuhan Univ, Sch Civil Engn, 8 Donghu South Rd, Wuhan 430072, Peoples R China 3.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Peoples R China 4.Huzhou Key Lab Green Bldg Technol, Huzhou 313002, Zhejiang, Peoples R China 5.Wuhan Univ, Wuhan, Peoples R China |
| 推荐引用方式 GB/T 7714 | Xu, Fengli,Wang, Dongxing,Xu, Xueyong,et al. Strengthening effect of nano-SiO2 on microbial induced carbonate precipitation (MICP) solidified sediment: Macro- and micro-analysis[J]. GEOMECHANICS FOR ENERGY AND THE ENVIRONMENT,2024,38:16. |
| APA | Xu, Fengli,Wang, Dongxing,Xu, Xueyong,&Xiao, Zunqun.(2024).Strengthening effect of nano-SiO2 on microbial induced carbonate precipitation (MICP) solidified sediment: Macro- and micro-analysis.GEOMECHANICS FOR ENERGY AND THE ENVIRONMENT,38,16. |
| MLA | Xu, Fengli,et al."Strengthening effect of nano-SiO2 on microbial induced carbonate precipitation (MICP) solidified sediment: Macro- and micro-analysis".GEOMECHANICS FOR ENERGY AND THE ENVIRONMENT 38(2024):16. |
入库方式： OAI收割
来源：武汉岩土力学研究所
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