Increasing the Strength Properties in weak Soil Using Microbial Techniques

Suriya, Pa.; Sangeetha, S.

doi:10.5890/jeam.2021.12.004

Cited by 6 publications

(2 citation statements)

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“…Although these methods can improve the bearing capacity of the soil to a certain extent, there will be noise, construction difficulties, harmful gases, and other shortcomings. In recent years, MICP technology has been recognized as an emerging low-carbon and environmentally friendly microbial reinforcement technology [3,4], and it has been widely used to improve the soil stability [5,6], cure sandy soils [7][8][9], repair concrete cracks [10,11], treat contaminated soils [12,13], and enhance the erosion resistance of slopes [14,15]. According to the different types of metabolism, the main reaction mechanisms of MICP technology can be divided into the urea hydrolysis reaction [16][17][18], the denitrification process [19,20], the sulfur reduction process [21], the iron reduction process [22,23], and so on.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Enhancing the Mechanical Properties of Sandy Soil by Combining Microbial Mineralization Technology with Silty Soil

Hu,

Fan,

Huang

et al. 2024

Materials

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Currently, coastal sandy soils face issues such as insufficient foundation strength, which has become one of the crucial factors constraining urban development. Geotechnical engineering, as a traditional discipline, breaks down disciplinary barriers, promotes interdisciplinary integration, and realizes the green ecological and low-carbon development of geotechnical engineering, which is highly important. Based on the “dual carbon” concept advocating a green and environmentally friendly lifestyle, Bacillus spores were utilized to induce calcium carbonate precipitation technology (MICP) to solidify coastal sandy soils, leveraging the rough-surface and low-permeability characteristics of silty soil. The mechanical-strength variations in the samples were explored through experiments, such as calcium carbonate generation rate tests, non-consolidated undrained triaxial shear tests, and scanning electron microscopy (SEM) experiments, to investigate the MICP solidification mechanism. The results indicate that by incorporating silty soil into sandy soil for MICP solidification, the calcium carbonate generation rates of the samples were significantly increased. With the increase in the silty-soil content, the enhancement range was 0.58–3.62%, with the maximum calcium carbonate generation rate occurring at a 5% content level. As the silty-soil content gradually increased from 1% to 5%, the peak deviator stress increased by 4.2–43.2%, enhancing the sample shear strength. Furthermore, the relationship between the internal-friction angle, cohesion, and shear strength further validates the enhancement of the shear strength. Silty soil plays roles in adsorption and physical filling during the MICP solidification process, reducing the inter-particle pores in sandy soil, increasing the compactness, providing adsorption sites, and enhancing the calcium carbonate generation rate, thereby improving the shear strength. The research findings can provide guidance for reinforcing poor coastal sandy-soil foundations in various regions.

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Section: Introductionmentioning

confidence: 99%

Experimental Study on Enhancing the Mechanical Properties of Sandy Soil by Combining Microbial Mineralization Technology with Silty Soil

Hu,

Fan,

Huang

et al. 2024

Materials

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“…Microbes present in the soil took sufficient nutrient and precipitating calcite in the voids, due to metabolic activity. This process is called microbial induced calcite precipitation (MICP) (Suriya and Sangeetha, 2021). Curing period, bacterial cell density, precipitating agent concentration, and temperature are the variables that have been investigated for the strength procurement during the study (Dejong et al, 2006;Cheng et al, 2012;He et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Enhancing the Strength Parameters of Dispersive Soil with Microbes and Jute Fibres as Sustainable Alternative

Suriya¹,

Sangeetha²

2023

Ecol. Eng. Environ. Technol.

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Aim of this study was assessing the characteristics of dispersive soil based on percentage of dispersion and degree of dispersion and to improve the strength of soil using microbes. This research has utilized the Microbial Induced Calcium Carbonate process (MICP) in conjunction with jute fibre for the improvement the erosive resistance in dispersive soil. Calcite formation occurred as a consequence of microbial biomass in voids of dispersive soil. Calcium carbonate was synthesized in the gaps of the soil matrix during the microbiological process. Bacillus sphaericus bacteria were used in this experiment, along with a 1 cm length of jute raw fibre of 1 cm long and a cell concentration of 6.4E+08 CFU mL -1 . The findings of the Unconfined compressive strength (UCS) test showed following of MICP treatment with and without jute fibre augmentation, UCS values causing the 11 and 13 times. Crumb test findings showed no colloidal solution was generated after microbial treatment, which was used for confirmation of the degree of dispersiveness reduction. Addition of jute fibres indicating better precipitation values of more than 4% due to the internal bonding strength. Ground renovation through microbial cementation yielded promising benefits, suggesting sustainability.

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Strengthening of Soil Through Microbial Induced Calcite Precipitation Using Acetobacter xylinum

Suriya,

Sangeetha

2024

Arab J Sci Eng

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Increasing the Strength Properties in weak Soil Using Microbial Techniques

Cited by 6 publications

References 0 publications

Experimental Study on Enhancing the Mechanical Properties of Sandy Soil by Combining Microbial Mineralization Technology with Silty Soil

Experimental Study on Enhancing the Mechanical Properties of Sandy Soil by Combining Microbial Mineralization Technology with Silty Soil

Enhancing the Strength Parameters of Dispersive Soil with Microbes and Jute Fibres as Sustainable Alternative

Strengthening of Soil Through Microbial Induced Calcite Precipitation Using Acetobacter xylinum

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