Experimental study on improving the effect of microorganisms in solidifying fine-grained soil by red mud
To improve the reinforcement effect of MICP technology on fine-grained soil, and consider the fine particle size and activity characteristics of red mud, the experiment of red mud strengthening MICP solidified fine-grained soil was designed and carried out. Combined with mechanical test and microstr...
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| Format: | Article |
| Language: | English |
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Elsevier
2025-02-01
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| Series: | Soils and Foundations |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S0038080624001409 |
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| author | Peng Liu Yu Cheng Guanghui Shao |
| author_facet | Peng Liu Yu Cheng Guanghui Shao |
| author_sort | Peng Liu |
| collection | DOAJ |
| description | To improve the reinforcement effect of MICP technology on fine-grained soil, and consider the fine particle size and activity characteristics of red mud, the experiment of red mud strengthening MICP solidified fine-grained soil was designed and carried out. Combined with mechanical test and microstructural analysis, the enhancing mechanism of red mud on microbial solidified fine-grained soil was comprehensively evaluated. The results show that: (1) Red mud can significantly improve the production of cement during microbial reinforcement of fine-grained soils; the optimal dosage of red mud is 20 %, which increases the strength by 34.6 % and the production of cement by 42.9 %, compared with conventional MICP. (2) After red mud was incorporated into the soil, the pore volume and pore diameter of the treated soil were significantly reduced, and the overall compactness was further improved. (3) The enhancement mechanism of microbial consolidation of fine-grained soils by red mud is mainly due to the presence of chemically active β-C2S and calcium oxide in red mud. These active calcium-based components undergo hydration and carbonation reactions under the action of microbial mineralization, generating calcium carbonate and hydrated calcium silicate, which improves the cement yield and enhances the intergranular bond strength, compactness and overall reinforcement effect of the treated soil. |
| format | Article |
| id | doaj-art-353a564ed3eb44838d9e5a0766179e94 |
| institution | Kabale University |
| issn | 2524-1788 |
| language | English |
| publishDate | 2025-02-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Soils and Foundations |
| spelling | doaj-art-353a564ed3eb44838d9e5a0766179e942025-01-09T06:12:10ZengElsevierSoils and Foundations2524-17882025-02-01651101562Experimental study on improving the effect of microorganisms in solidifying fine-grained soil by red mudPeng Liu0Yu Cheng1Guanghui Shao2School of Civil Engineering, Nanjing Forestry University, Nanjing, PR China; Corresponding author.School of Transportation, Shandong University of Science and Technology, Qingdao, PR ChinaSchool of Civil Engineering, Nanjing Forestry University, Nanjing, PR ChinaTo improve the reinforcement effect of MICP technology on fine-grained soil, and consider the fine particle size and activity characteristics of red mud, the experiment of red mud strengthening MICP solidified fine-grained soil was designed and carried out. Combined with mechanical test and microstructural analysis, the enhancing mechanism of red mud on microbial solidified fine-grained soil was comprehensively evaluated. The results show that: (1) Red mud can significantly improve the production of cement during microbial reinforcement of fine-grained soils; the optimal dosage of red mud is 20 %, which increases the strength by 34.6 % and the production of cement by 42.9 %, compared with conventional MICP. (2) After red mud was incorporated into the soil, the pore volume and pore diameter of the treated soil were significantly reduced, and the overall compactness was further improved. (3) The enhancement mechanism of microbial consolidation of fine-grained soils by red mud is mainly due to the presence of chemically active β-C2S and calcium oxide in red mud. These active calcium-based components undergo hydration and carbonation reactions under the action of microbial mineralization, generating calcium carbonate and hydrated calcium silicate, which improves the cement yield and enhances the intergranular bond strength, compactness and overall reinforcement effect of the treated soil.http://www.sciencedirect.com/science/article/pii/S0038080624001409Fine-grained soilRed mudBiomineralizationMICPMechanical propertiesEnhancement mechanism |
| spellingShingle | Peng Liu Yu Cheng Guanghui Shao Experimental study on improving the effect of microorganisms in solidifying fine-grained soil by red mud Soils and Foundations Fine-grained soil Red mud Biomineralization MICP Mechanical properties Enhancement mechanism |
| title | Experimental study on improving the effect of microorganisms in solidifying fine-grained soil by red mud |
| title_full | Experimental study on improving the effect of microorganisms in solidifying fine-grained soil by red mud |
| title_fullStr | Experimental study on improving the effect of microorganisms in solidifying fine-grained soil by red mud |
| title_full_unstemmed | Experimental study on improving the effect of microorganisms in solidifying fine-grained soil by red mud |
| title_short | Experimental study on improving the effect of microorganisms in solidifying fine-grained soil by red mud |
| title_sort | experimental study on improving the effect of microorganisms in solidifying fine grained soil by red mud |
| topic | Fine-grained soil Red mud Biomineralization MICP Mechanical properties Enhancement mechanism |
| url | http://www.sciencedirect.com/science/article/pii/S0038080624001409 |
| work_keys_str_mv | AT pengliu experimentalstudyonimprovingtheeffectofmicroorganismsinsolidifyingfinegrainedsoilbyredmud AT yucheng experimentalstudyonimprovingtheeffectofmicroorganismsinsolidifyingfinegrainedsoilbyredmud AT guanghuishao experimentalstudyonimprovingtheeffectofmicroorganismsinsolidifyingfinegrainedsoilbyredmud |