Strength and microstructure characteristics of MICP-modified cement soil in Nansha District of Guangzhou

LI Risheng; ZHANG Chengbo; YANG Ming; WANG Xi; LIU Fengtao

doi:10.13471/j.cnki.acta.snus.2021B045

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Strength and microstructure characteristics of MICP-modified cement soil in Nansha District of Guangzhou

Research articles | 更新时间：2023-11-01

- Strength and microstructure characteristics of MICP-modified cement soil in Nansha District of Guangzhou
- Acta Scientiarum Naturalium Universitatis Sunyatseni Vol. 61, Issue 4, Pages: 133-141(2022)
- 作者机构：
  
  中山大学地球科学与工程学院，广东珠海 519082
- 作者简介：
- 基金信息：
- DOI：10.13471/j.cnki.acta.snus.2021B045
  CLC： TU411
- Published：25 July 2022，
  
  Published Online：26 January 2022，
  
  Received：12 May 2021，
  
  Accepted：04 June 2021
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李日升,张澄博,杨明等.基于MICP改性的广州南沙区水泥土的强度及微观特征[J].中山大学学报(自然科学版),2022,61(04):133-141.

LI Risheng,ZHANG Chengbo,YANG Ming,et al.Strength and microstructure characteristics of MICP-modified cement soil in Nansha District of Guangzhou[J].Acta Scientiarum Naturalium Universitatis Sunyatseni,2022,61(04):133-141.
李日升,张澄博,杨明等.基于MICP改性的广州南沙区水泥土的强度及微观特征[J].中山大学学报(自然科学版),2022,61(04):133-141. DOI： 10.13471/j.cnki.acta.snus.2021B045.

LI Risheng,ZHANG Chengbo,YANG Ming,et al.Strength and microstructure characteristics of MICP-modified cement soil in Nansha District of Guangzhou[J].Acta Scientiarum Naturalium Universitatis Sunyatseni,2022,61(04):133-141. DOI： 10.13471/j.cnki.acta.snus.2021B045.

摘要

利用微生物诱导碳酸钙沉淀（MICP，microbial induced carbonate precipitation）技术，研究了改善广州南沙区水泥土强度的可行性。将巴氏芽孢杆菌菌液和尿素混合溶液制成菌液组水泥土试样，与空白对照组、培养基组试样的无侧限抗压强度进行比较，并通过离子浓度监测、XRD、SEM和压汞实验研究了细菌对水泥土微观结构的影响，探讨了强度改善的机理。实验结果表明：菌液组水泥土在第7天、14天、28天的抗压强度分别比空白对照组高91.3%、53.4%、45.3%，改善幅度随养护时间增加而降低。菌液中的培养基和尿素对水泥土强度存在负面影响。巴氏芽孢杆菌在菌液组水泥土内部发生尿素水解反应并提供成核位置，促使大量游离Ca

转为含钙矿物沉淀，生成了更多的方解石和水化硅酸钙（C - S - H），减小了孔隙体积和孔径尺寸，使水泥土内部颗粒连结和空间结构更紧密，从而改善了水泥土的强度。

Abstract

The feasibility of using microbial induced carbonate precipitation （MICP） to improve the strength of cement soil in Nansha District of Guangzhou is studied. The unconfined compressive strength of the bacteria solution group cement soil， made by the mixed solution of bacteria solution and urea， is compared with the control group and the medium group. The effect of bacteria on the microstructure of cement soil is studied by ion concentration monitoring， XRD， SEM and mercury intrusion test， and the mechanism of strength improvement is discussed. The experimental results show that the compressive strength of 7 days， 14 days and 28 days in the bacteria solution group is 91.3%， 53.4% and 45.3% higher than that in the control group respectively， and the improvement range decreases with the increase of curing time. The medium and urea have negative effects on the strength of cement soil. Sporosarcina pasteurii hydrolyzes urea and provides nucleation site in the bacteria solution group cement soil， which promotes a large number of free Ca

to transform into calcium mineral precipitation， generates more calcite and hydrated calcium silicate （C-S-H）， reduces the pore volume and pore size， makes the internal particle connection and spatial structure of cement soil more compact， thus improving the strength of cement soil.

关键词

水泥土微生物诱导碳酸钙沉淀尿素水解微观结构

Keywords

cement soilMICPurea hydrolysismicrostructure

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