Mechanical Behavior and Microstructural Study of Biocemented Sand under Various Treatment Methods
Biocementation mainly relies on the formation of calcium carbonate to bind soil particles. This paper investigates the effectiveness of biocementation in terms of treatment methods. The previously established two-phase methods are compared with newly developed one-phase-low-pH methods on their mecha...
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| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Wiley
2022-01-01
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| Series: | Geofluids |
| Online Access: | http://dx.doi.org/10.1155/2022/6015335 |
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| _version_ | 1832565831112851456 |
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| author | Xuecheng Gao Shaokang Han Yang Yang Wengang Zhang Tan Zou Liang Cheng |
| author_facet | Xuecheng Gao Shaokang Han Yang Yang Wengang Zhang Tan Zou Liang Cheng |
| author_sort | Xuecheng Gao |
| collection | DOAJ |
| description | Biocementation mainly relies on the formation of calcium carbonate to bind soil particles. This paper investigates the effectiveness of biocementation in terms of treatment methods. The previously established two-phase methods are compared with newly developed one-phase-low-pH methods on their mechanical behavior and microstructure. The one-phase-low-pH methods present a higher urease fixation rate than two-phase methods, highlighting the cost-effectiveness of this method. A modified one-phase-low-pH using CH3COOH is also compared with HCl-based one-phase-low-pH method. The results show that the morphology and size of precipitated crystals have a great influence on strength development. An optimized treatment method based on the one-phase-low-pH method is also established, which is accomplished via the injection of 5 U/ml of bacterial culture together with 2 M of cementation solution during each treatment. After four times of treatments, a total of 7% cumulative calcium carbonate content can be obtained with an unconfined compressive strength of 2.15 MPa. |
| format | Article |
| id | doaj-art-0472fddf1f2f43eea362eaab98aed789 |
| institution | Kabale University |
| issn | 1468-8123 |
| language | English |
| publishDate | 2022-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geofluids |
| spelling | doaj-art-0472fddf1f2f43eea362eaab98aed7892025-02-03T01:06:34ZengWileyGeofluids1468-81232022-01-01202210.1155/2022/6015335Mechanical Behavior and Microstructural Study of Biocemented Sand under Various Treatment MethodsXuecheng Gao0Shaokang Han1Yang Yang2Wengang Zhang3Tan Zou4Liang Cheng5School of Civil EngineeringSchool of Civil EngineeringSchool of Civil EngineeringSchool of Civil EngineeringChongqing University Industrial Technology Research InstituteSchool of Environmental and Safety EngineeringBiocementation mainly relies on the formation of calcium carbonate to bind soil particles. This paper investigates the effectiveness of biocementation in terms of treatment methods. The previously established two-phase methods are compared with newly developed one-phase-low-pH methods on their mechanical behavior and microstructure. The one-phase-low-pH methods present a higher urease fixation rate than two-phase methods, highlighting the cost-effectiveness of this method. A modified one-phase-low-pH using CH3COOH is also compared with HCl-based one-phase-low-pH method. The results show that the morphology and size of precipitated crystals have a great influence on strength development. An optimized treatment method based on the one-phase-low-pH method is also established, which is accomplished via the injection of 5 U/ml of bacterial culture together with 2 M of cementation solution during each treatment. After four times of treatments, a total of 7% cumulative calcium carbonate content can be obtained with an unconfined compressive strength of 2.15 MPa.http://dx.doi.org/10.1155/2022/6015335 |
| spellingShingle | Xuecheng Gao Shaokang Han Yang Yang Wengang Zhang Tan Zou Liang Cheng Mechanical Behavior and Microstructural Study of Biocemented Sand under Various Treatment Methods Geofluids |
| title | Mechanical Behavior and Microstructural Study of Biocemented Sand under Various Treatment Methods |
| title_full | Mechanical Behavior and Microstructural Study of Biocemented Sand under Various Treatment Methods |
| title_fullStr | Mechanical Behavior and Microstructural Study of Biocemented Sand under Various Treatment Methods |
| title_full_unstemmed | Mechanical Behavior and Microstructural Study of Biocemented Sand under Various Treatment Methods |
| title_short | Mechanical Behavior and Microstructural Study of Biocemented Sand under Various Treatment Methods |
| title_sort | mechanical behavior and microstructural study of biocemented sand under various treatment methods |
| url | http://dx.doi.org/10.1155/2022/6015335 |
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