Experimental Study on Disintegration of Strongly Weathered Granular Granite Cemented by MICP in the Seawater Environment

LIN Wenbin; WANG Bin; GAO Yupeng; KE Jintao; CAO Shenggen; KONG Qiuping

doi:10.3724/j.gyjzG24031816

Volume 54 Issue 9

Sep. 2024

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LIN Wenbin, WANG Bin, GAO Yupeng, KE Jintao, CAO Shenggen, KONG Qiuping. Experimental Study on Disintegration of Strongly Weathered Granular Granite Cemented by MICP in the Seawater Environment[J]. INDUSTRIAL CONSTRUCTION, 2024, 54(9): 1-9. doi: 10.3724/j.gyjzG24031816

Citation:

LIN Wenbin, WANG Bin, GAO Yupeng, KE Jintao, CAO Shenggen, KONG Qiuping. Experimental Study on Disintegration of Strongly Weathered Granular Granite Cemented by MICP in the Seawater Environment[J]. INDUSTRIAL CONSTRUCTION, 2024, 54(9): 1-9. doi: 10.3724/j.gyjzG24031816

Citation:

LIN Wenbin, WANG Bin, GAO Yupeng, KE Jintao, CAO Shenggen, KONG Qiuping. Experimental Study on Disintegration of Strongly Weathered Granular Granite Cemented by MICP in the Seawater Environment[J]. INDUSTRIAL CONSTRUCTION, 2024, 54(9): 1-9. doi: 10.3724/j.gyjzG24031816

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Experimental Study on Disintegration of Strongly Weathered Granular Granite Cemented by MICP in the Seawater Environment

doi: 10.3724/j.gyjzG24031816

1. Fujian Provincial Key Laboratory of Advanced Technology and Informatization in Civil Engineering, Fujian University of Technology, Fuzhou 350118, China;
2. Institute of Earth Sciences and Engineering, Fujian University of Technology, Fuzhou 350118, China;
3. Fujian Yonking Construction Geotechnical Co., Ltd., Longyan 364000, China

Received Date: 2024-03-18
Available Online: 2024-10-18

Abstract

Abstract

The Microbially Induced Calcite Precipitation (MICP) grouting technique was conducted to cement strongly weathered granular granite, and the influence on physical and mechanical properties and disintegration characteristics of specimens after being cemented with different cementing solvents, cementitious concentrations, and rounds of grouting cycles in the seawater environment was analyzed. The results showed the physical and mechanical properties and disintegration resistance of the strongly weathered granular granite were distinctly improved after being cured by MICP; meanwhile, when seawater was used as cementing solvents, the cementitious effect for specimens was better than that in freshwater, and its unconfined compressive strength, calcium carbonate content, dry density and disintegration resistance were higher than those in freshwater. In addition, with the increase in the cementitions concentration, unconfined compressive strength, calcium carbonate content and dry density of specimens tended to first increasing and then decreasing, simultaneously, the final disintegration ratios of specimens tended to first decreasing and then increasing. The optimum cementitious concentration was 0.75 mol/L. The calcium carbonate content and unconfined compressive strength of cured specimens increased with the increase in rounds of grouting cycles and the final disintegration ratios were gradually decreased in the optimum cementitious concentration solution; the maximum value of unconfined compressive strength of specimens after 4 rounds of grouting cycles was up to 9.38 MPa, and the disintegration ratio was only 1.5%.
- strongly weathered granular granite,
- MICP,
- cementation,
- disintegration ratio,
- calcium carbonate content

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References

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