微生物-碳化改性钢渣及其对水泥水化特性影响研究进展

邓威; 翟健梁; 赖淏; 陆福洋; 宗有杰; 熊锐; 关博文; 常明丰

微生物-碳化改性钢渣及其对水泥水化特性影响研究进展

邓威¹,
翟健梁¹,
赖淏¹,
陆福洋¹,
宗有杰^{1, 2},
熊锐^1, ,,
关博文¹,
常明丰¹

1.
长安大学材料科学与工程学院, 陕西, 西安, 710061
2.
诺丁汉大学土木工程学院, 英国, 诺丁汉, NG1 4BU

基金项目: 青海省重点研发与转化计划项目(No.2023-SF-124)

详细信息

通讯作者:
熊锐，博士，副教授，博士生导师，研究方向为道路工程材料　E-mail: xiongr61@126.com

中图分类号: TU528; TB332
计量
- 文章访问数: 93
- HTML全文浏览量: 37
- 被引次数: 0
出版历程
- 收稿日期: 2024-03-12
- 修回日期: 2024-04-18
- 录用日期: 2024-05-02
- 网络出版日期: 2024-06-12

Research progress of microorganism-carbonization modified steel slag and its effect on hydration characteristics of cement

1.
School of Materials Science and Engineering, Chang'an University, Xian 710061, China
2.
School of Civil Engineering, University of Nottingham, Nottingham, NG1 4BU, England

Funds: Key Research & Development and Transformation Plan Project of Qinghai Province (No.2023-SF-124)

摘要

摘要: 微生物诱导碳酸盐沉淀(MICP)是一种新型环保处理技术，其独特的矿化及生物酶催化机制在固废处理及利用方面展现出广阔前景。基于钢渣水化特性，本文探讨了碳化条件及生物酶特性对碳酸盐成核影响，分析并总结了MICP与碳化反应机制、生物-碳化改性中钢渣的物相演变规律、碳酸钙成核及晶体生长等研究进展，从力学性能、水化热及体积稳定性角度进一步综述了改性钢渣对水泥基胶凝材料水化特性影响机制，指出了现阶段微生物-碳化技术在钢渣改性研究中存在的不足，为实现钢渣低污染、高质化利用提供有益参考。
- 钢渣 /
- 水化特性 /
- 微生物 /
- 催化酶 /
- 碳酸盐沉淀 /
- 碳化反应 /
- 成核效应
Abstract: Microbially induced calcium carbonate precipitation (MICP) is a novel environmentally friendly treatment technology, which shows broad prospects in solid waste treatment and utilization due to its unique mineralization and bio-enzymatic catalysis mechanism. Based on the hydration characteristics of steel slag, this paper explores the influence of carbonation conditions and enzymatic characteristics on carbonate nucleation, analyzes and summarizes the research progress on the reaction mechanism of MICP and carbonation, phase evolution of steel slag in bio-carbonation modification, carbonate nucleation, and crystal growth. Furthermore, from the perspectives of mechanical properties, hydration heat, and volume stability, the impact mechanism of modified steel slag on the hydration characteristics of cement-based cementitious materials is further reviewed. The paper points out the current deficiencies in microorganism-carbonation technology in the research of steel slag modification, providing valuable references for achieving low-pollution and high-quality utilization of steel slag.
- Steel slag /
- Hydration characteristic /
- Microorganism /
- Catalyzing enzyme /
- Carbonate precipitation /
- Carbonation reaction /
- Nucleation effect

HTML全文

图 1 钢渣BES微观形貌^[25]

Figure 1. BES morphology of steel slag

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图 2 钢渣抑制复合浆体Ca(OH)₂析出和C-S-H成核及生长^[2]

Figure 2. Steel slag inhibited Ca(OH)₂ precipitation and C-S-H nucleation and growth of composite slurry^[2]

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图 3 干/湿法碳化装置示意图^[10]

Figure 3. Schematic diagram of dry/aqueous carbonization plant^[10]

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图 4 微生物诱导CaCO₃/MgCO₃沉淀示意图

Figure 4. Schematic diagram of CaCO₃/MgCO₃ precipitation induced by microorganism

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图 5 微生物介导细胞外矿化：A1为酵母细胞；A2为细胞表面的CaCO₃直接沉淀；A3为EPS降解后的CaCO₃沉淀^{[53, 60]}

Figure 5. Microbial mediated extracellular mineralization: A1 is yeast cell; A2 is the direct precipitation of CaCO₃ on the cell surface. A3 is CaCO₃ precipitation after EPS degradation^{[53, 60]}

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图 6 细胞壁表面CaCO₃不均匀沉淀过程^[57]

Figure 6. Heterogeneous precipitation of CaCO₃ on cell wall surface^[57]

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图 7 微生物-碳化协同处理钢渣相变反应^{[77, 78]}

Figure 7. Microorganism-Carbonization synergistic treatment of steel slag phase transition reaction^{[77, 78]}

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图 8 三类钢渣-水泥砂浆不同龄期抗折强度^{[16, 81]}

Figure 8. The flexural strength of three types of steel slag-cement mortar at different ages^{[16, 81]}

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图 9 三类钢渣-水泥砂浆不同龄期抗压强度^{[16, 81, 86]}

Figure 9. The compressive strength of three types of steel slag-cement mortar at different ages^{[16, 81, 86]}

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图 10 三类钢渣-水泥净浆沸煮后三维结构孔隙演化^[16]

Figure 10. 3 D-pore structure evolution of three-type steel slag-cement paste after boiling^[16]

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表 1 不同因素对钢渣碳化效果影响

Table 1. Influence of different factors on carbonization effect of steel slag

Factor	Influencing mechanism	References
Temperature	Raising the carbonization temperature facilitates the leaching of carbonate ions, but excessively high temperatures reduce the solubility of CO₂ in the liquid phase.	[34, 35]
Time	In the initial stages of carbonization, the rate of calcium conversion increases linearly with carbonization time; however, in the later stages, it is restricted by the carbonized layer, leading to a significant decrease in the diffusion rate of silicate ions.	[36]
Air pressure	High pressure is conducive to enhancing the uniform distribution of calcium carbonate and accelerating the diffusion and dissolution of CO₂. However, in the later stages, the carbonized layer restricts further reaction between CO₂ and carbonate ions.	[37, 38]
Concentrations of CO₂	High CO₂ concentration provides an ample carbon source for the carbonization reaction, accelerating the rate of calcium conversion. However, in the later stages, the reaction rate of carbonization no longer increases due to the influence of solution supersaturation.	[39]
Size of steel slag	Smaller steel slag particle size increases the contact area with the carbon source, leading to a more thorough reaction between steel slag particles and CO₂, resulting in more carbonization products.	[40]
Humidity	The increase in moisture accelerates the dissolution of CO₂ and the leaching of Ca²⁺, but excessive moisture can block the surface pores of steel slag, thereby restricting the penetration of CO₂.	[38, 41]

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表 2 脲酶与碳酸酐酶特性^[52-54]

Table 2. Characteristics of urease and carbonic anhydrase^[52-54]

Catalytic enzyme type	High activity range		Catalytic object	Typical microorganism	Chemical construction
Catalytic enzyme type	Temperature	PH	Catalytic object	Typical microorganism	Chemical construction
Urease	30-40℃	7.0-8.0	Urea	Bacillus pasteurelli
Carbonic anhydrase	35-55℃	7.0-10.0	CO₂	Bacillus mucosus

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