Experimental Study on the Influence of Different Factors on the Mechanical Properties of a Soil–Rock Mixture Solidified by Micro-Organisms
In this paper, we focus on the application of mechanical properties in a soil–rock mixture modified by microbial mineralization under the influence of different factors, including pH value, cementing solution concentration, and cementing time. Cementing fluids and samples with different pH values, c...
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2022-10-01
|
| Series: | Materials |
| Subjects: | |
| Online Access: | https://www.mdpi.com/1996-1944/15/20/7394 |
| _version_ | 1797471719687979008 |
|---|---|
| author | Yongshuai Sun Jianguo Lv Ya Tuo Guihe Wang |
| author_facet | Yongshuai Sun Jianguo Lv Ya Tuo Guihe Wang |
| author_sort | Yongshuai Sun |
| collection | DOAJ |
| description | In this paper, we focus on the application of mechanical properties in a soil–rock mixture modified by microbial mineralization under the influence of different factors, including pH value, cementing solution concentration, and cementing time. Cementing fluids and samples with different pH values, calcium ion concentrations, and mineralization cementation were prepared. The process of urea hydrolysis MICP under different factors was studied. A solidified soil–rock mixture sample under triaxial compression was measured. Then, combined with scanning test methods, such as SEM and XRD, the influence of different factors on the mechanical strength and failure mode of the soil–rock mixture structure was analyzed from a microscopic point of view. The results show that a low concentration of cementing solution with a high concentration of bacteria liquid generated the highest calcium carbonate content and the strongest cementing ability. When the pH value of the cementation solution is six, the cementation effect between the pores is the best, and the deviatoric stress is stronger. When wet-curing samples, short or long curing time will adversely affect the strength of soil–rock mixture samples, the strongest curing and cementing ability is 5 days. The microscopic results show that the microbial mineralization technology fills the pores between the particles, and the interaction force between particles is enhanced to enhance the strength of the soil–rock mixture. |
| first_indexed | 2024-03-09T19:53:09Z |
| format | Article |
| id | doaj.art-71a757114d484ce6b3d3c17ef98bc582 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-09T19:53:09Z |
| publishDate | 2022-10-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-71a757114d484ce6b3d3c17ef98bc5822023-11-24T01:05:58ZengMDPI AGMaterials1996-19442022-10-011520739410.3390/ma15207394Experimental Study on the Influence of Different Factors on the Mechanical Properties of a Soil–Rock Mixture Solidified by Micro-OrganismsYongshuai Sun0Jianguo Lv1Ya Tuo2Guihe Wang3College of Water Resources & Civil Engineering, China Agricultural University, Beijing 100083, ChinaSchool of Engineering and Technology, China University of Geosciences, Beijing 100083, ChinaSchool of Engineering and Technology, China University of Geosciences, Beijing 100083, ChinaSchool of Engineering and Technology, China University of Geosciences, Beijing 100083, ChinaIn this paper, we focus on the application of mechanical properties in a soil–rock mixture modified by microbial mineralization under the influence of different factors, including pH value, cementing solution concentration, and cementing time. Cementing fluids and samples with different pH values, calcium ion concentrations, and mineralization cementation were prepared. The process of urea hydrolysis MICP under different factors was studied. A solidified soil–rock mixture sample under triaxial compression was measured. Then, combined with scanning test methods, such as SEM and XRD, the influence of different factors on the mechanical strength and failure mode of the soil–rock mixture structure was analyzed from a microscopic point of view. The results show that a low concentration of cementing solution with a high concentration of bacteria liquid generated the highest calcium carbonate content and the strongest cementing ability. When the pH value of the cementation solution is six, the cementation effect between the pores is the best, and the deviatoric stress is stronger. When wet-curing samples, short or long curing time will adversely affect the strength of soil–rock mixture samples, the strongest curing and cementing ability is 5 days. The microscopic results show that the microbial mineralization technology fills the pores between the particles, and the interaction force between particles is enhanced to enhance the strength of the soil–rock mixture.https://www.mdpi.com/1996-1944/15/20/7394soil–rock mixtureMICPtriaxial compression testdeviatoric stressshear strainSEM |
| spellingShingle | Yongshuai Sun Jianguo Lv Ya Tuo Guihe Wang Experimental Study on the Influence of Different Factors on the Mechanical Properties of a Soil–Rock Mixture Solidified by Micro-Organisms Materials soil–rock mixture MICP triaxial compression test deviatoric stress shear strain SEM |
| title | Experimental Study on the Influence of Different Factors on the Mechanical Properties of a Soil–Rock Mixture Solidified by Micro-Organisms |
| title_full | Experimental Study on the Influence of Different Factors on the Mechanical Properties of a Soil–Rock Mixture Solidified by Micro-Organisms |
| title_fullStr | Experimental Study on the Influence of Different Factors on the Mechanical Properties of a Soil–Rock Mixture Solidified by Micro-Organisms |
| title_full_unstemmed | Experimental Study on the Influence of Different Factors on the Mechanical Properties of a Soil–Rock Mixture Solidified by Micro-Organisms |
| title_short | Experimental Study on the Influence of Different Factors on the Mechanical Properties of a Soil–Rock Mixture Solidified by Micro-Organisms |
| title_sort | experimental study on the influence of different factors on the mechanical properties of a soil rock mixture solidified by micro organisms |
| topic | soil–rock mixture MICP triaxial compression test deviatoric stress shear strain SEM |
| url | https://www.mdpi.com/1996-1944/15/20/7394 |
| work_keys_str_mv | AT yongshuaisun experimentalstudyontheinfluenceofdifferentfactorsonthemechanicalpropertiesofasoilrockmixturesolidifiedbymicroorganisms AT jianguolv experimentalstudyontheinfluenceofdifferentfactorsonthemechanicalpropertiesofasoilrockmixturesolidifiedbymicroorganisms AT yatuo experimentalstudyontheinfluenceofdifferentfactorsonthemechanicalpropertiesofasoilrockmixturesolidifiedbymicroorganisms AT guihewang experimentalstudyontheinfluenceofdifferentfactorsonthemechanicalpropertiesofasoilrockmixturesolidifiedbymicroorganisms |