Experimental study on permeability and strength characteristics of MICP-treated calcareous sand

Chen, Yumin; Han, Yi; Zhang, Xinlei; Sarajpoor, Saeed; Zhang, Shuhang; Yao, Xiaofei

doi:10.1016/j.bgtech.2023.100034

Cited by 24 publications

(4 citation statements)

References 44 publications

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“…4 ), and they were statistically significant (Table 4 ). This observation aligns with previous studies, and our study highlights the enhanced urease activity associated with higher temperatures in sand cementation research (Cheng et al 2015 ; He et al 2020 ; Murugan et al 2021 ; Chen et al 2023 ). The significant outcome of our study was the achievement of a permeability rate in the range of 10 − 6 m/s with strain B2 at 30 °C, as depicted in Fig.…”

Section: Resultssupporting

confidence: 93%

“…Changes in permeability affect the overall performance of cemented sand structures, with lower permeability corresponding to greater soil stability and durability. Understanding the implications of permeability results is essential for optimizing MICP techniques and designing effective soil stabilization strategies (Chen et al 2023 ; Pacheco et al 2022 ).…”

Section: Resultsmentioning

confidence: 99%

“…These bacterial species sustain precipitation, laying the foundation for developing stable and compacted cementitious matrices. Recent MICP advancements include novel bacterial strains, adaptable to diverse environments, and treatments on varied soil types, including calcareous, laterite, and clay soils, demonstrating the versatility of this technique and its relevance in addressing modern challenges (Chen et al 2023 ; Ghorbanzadeh et al 2020 ; Li et al 2023b ).…”

Section: Introductionmentioning

confidence: 99%

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Synergistic biocementation: harnessing Comamonas and Bacillus ureolytic bacteria for enhanced sand stabilization

Rajasekar,

Zhao,

et al. 2024

World J Microbiol Biotechnol

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Biocementation, driven by ureolytic bacteria and their biochemical activities, has evolved as a powerful technology for soil stabilization, crack repair, and bioremediation. Ureolytic bacteria play a crucial role in calcium carbonate precipitation through their enzymatic activity, hydrolyzing urea to produce carbonate ions and elevate pH, thus creating favorable conditions for the precipitation of calcium carbonate. While extensive research has explored the ability of ureolytic bacteria isolated from natural environments or culture conditions, bacterial synergy is often unexplored or under-reported. In this study, we isolated bacterial strains from the local eutrophic river canal and evaluated their suitability for precipitating calcium carbonate polymorphs. We identified two distinct bacterial isolates with superior urea degradation ability (conductivity method) using partial 16 S rRNA gene sequencing. Molecular identification revealed that they belong to the Comamonas and Bacillus genera. Urea degradation analysis was performed under diverse pH (6,7 and 8) and temperature (15 °C,20 °C,25 °C and 30 °C) ranges, indicating that their ideal pH is 7 and temperature is 30 °C since 95% of the urea was degraded within 96 h. In addition, we investigated these strains individually and in combination, assessing their microbially induced carbonate precipitation (MICP) in silicate fine sand under low (14 ± 0.6 °C) and ideal temperature 30 °C conditions, aiming to optimize bio-mediated soil enhancement. Results indicated that 30 °C was the ideal temperature, and combining bacteria resulted in significant (p ≤ 0.001) superior carbonate precipitation (14–16%) and permeability (> 10− 6 m/s) in comparison to the average range of individual strains. These findings provide valuable insights into the potential of combining ureolytic bacteria for future MICP research on field applications including soil erosion mitigation, soil stabilization, ground improvement, and heavy metal remediation.

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Section: Resultssupporting

confidence: 93%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Synergistic biocementation: harnessing Comamonas and Bacillus ureolytic bacteria for enhanced sand stabilization

Rajasekar,

Zhao,

et al. 2024

World J Microbiol Biotechnol

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“…The curing periods on the properties of biocemented soil had a small effect. Similarly, Chen et al (2023) [14] examined the effects of relative density, CS concentration, and frequency of consolidation on the mechanical properties of biocemented-sandy soil. The study findings showed that consolidation frequency was the most influential factor on the properties of the soil, with a 5-15 times as effective range.…”

Section: Introductionmentioning

confidence: 99%

Effect of Bio-Cementation with Rice Husk Ash on Permeability of Silty Sand

Sorum,

Kalita

2023

Civ Eng J

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The scarcity of competent soils in the desired locations has forced geotechnical engineers to look for soil stabilization that is sustainable and environment-friendly. In this regard, bio-cementation technology has received a lot of interest in this area because of its benefits over traditional soil stabilization techniques. The present study aims to examine the influence of the bio-cementation technique with and without Rice Husk Ash (RHA) on the permeability property of silty sand. Biocemented soil samples were prepared with various combinations of the bacterial solution (0.5, 1.0, and 1.5 optical density (OD)) and cementation solution (0.5, 1.0, and 1.5 molarity) at 0, 3, 7, 14, and 28 curing days. The RHA, an agricultural waste with good pozzolanic qualities, was added to the control soil and the biocemented soil samples at 5, 10, and 15% by weight. A falling head permeability test was employed in this study. The test results showed that the permeability of the soil decreased when the bio-cementation technique, with or without RHA, was applied. The permeability of the soil decreased with increasing BS and CS concentrations in all curing days. A greater decrease in the permeability value was seen when the RHA additive was added to the bio-cemented soil. The results of the micro-analysis tests were also in support of this reduction. Overall, the addition of RHA up to 10% with 1.0 OD BS and 1.0M CS at a 14-day curing period was noted to optimally reduce the permeability property of the soil. Doi: 10.28991/CEJ-2023-09-11-016 Full Text: PDF

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