Mechanical behaviour of MICP-treated silty sand

Karimian, Akram; Hassanlourad, Mahmoud

doi:10.1007/s10064-022-02780-2

Cited by 21 publications

(4 citation statements)

References 54 publications

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“…However, the response of soil mixtures to the MICP soil enhancement method still needs to be explored. The predominant focus of research on biomediated soil improvement has been on pure sands (Karimian and Hassanlourad 2022). Therefore, the fine-grained soil component was obtained by sieving the silica sand (before washing) through a No.…”

Section: Soil Materialsmentioning

confidence: 99%

Effect of Cementation Ratio and Molarity on Mechanical Properties of MICP-Treated Sand Subjected to Freeze-Thaw Cycles

Abbasi,

Hosseinpour,

Barari

et al. 2024

Preprint

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This study investigates the efficacy of microbial-induced carbonate precipitation (MICP) on the mechanical properties of poorly graded sand through a set of laboratory experiments. Unconfined Compressive Strength (UCS), Ultrasonic Pulse Velocity (UPV), Scanning Electron Microscopy (SEM), and calcium carbonate assessments were conducted to evaluate the influence of MICP under varying cementation concentrations, cementation ratios, and injection cycles. To this end, treated samples underwent 3, 14, and 21 injection cycles with cementation ratios ranging from 10–90% and molarities of 0.25, 0.5, 0.75, and 1 mol/L. Optimally stabilized samples were then subjected to 2, 4, 6, 8, 10, and 12 freeze-thaw cycles to evaluate their thermal durability. Correlation relationships were also developed to predict the compressive strength and stiffness of MICP-treated sand. Results demonstrated that MICP treatment effectively enhanced the UCS and stiffness by forming interlocking zones between the sand particles. Accordingly, the maximum UCS, secant stiffness, and constrained modulus were achieved at 14.98% calcite content using Sporosarcina pasteurii bacteria accompanied by a 50% cementation ratio and molarity of 0.75 mol/L over 21 injection cycles. Also, the optimally stabilized specimens exhibited 70% and 90% retention in USC and stiffness after 12 freeze-thaw cycles, confirming their sustainability under harsh thermal conditions.

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Section: Soil Materialsmentioning

confidence: 99%

Effect of Cementation Ratio and Molarity on Mechanical Properties of MICP-Treated Sand Subjected to Freeze-Thaw Cycles

Abbasi,

Hosseinpour,

Barari

et al. 2024

Preprint

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“…Hence, many researchers have been searching for new binders to tailor more environmentally friendly backfilling materials. This is the case of microbially induced carbonate precipitation (MICP), which is a more sustainable biomineralization technology [15][16][17][18], to be used as a novel binder. It is based on the enzymatic reaction of microorganisms that produce urease through cellular metabolism and catalyze the decomposition of urea to produce NH4 + and CO3 2− ions, which, in turn, provide CO3 2− for the mineralization reaction:…”

Section: Introductionmentioning

confidence: 99%

Novel Understandings of Biomineralization in Backfill Materials: A Fundamental Investigation of Coal Gangue and Fly Ash Impact on B. pasteurii to Enhance Material Properties

Guo,

Fantilli,

Yan

et al. 2024

Applied Sciences

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This paper proposes a fundamental investigation of coal gangue and fly ash impact on B. pasteurii to enhance the properties of backfill materials. The goal is to obtain effective microbial mineralization and potential mechanical properties of coal gangue and fly ash as backfill materials and to mitigate the impact of the most common binders used in the backfill material of mines. Micro-scale mineralization was performed with B. pasteurii bacteria using microbially induced carbonate precipitation (MICP) technology to clarify solid waste impact on B. pasteurii and to bind coal gangue and fly ash. Several tests were carried out to analyze the behavior of B. pasteurii, especially when it coexists with these two waste materials separately. In such cases, it was possible to observe a reduction in mineralization initiation time with respect to the natural mineralization of the MICP technology. Moreover, at the macro-scale, the new mineralized backfilling material shows good workability in the fresh state, whereas the strength at 28 days is 5.34 times higher than that obtained with non-mineralized coal gangue and fly ash.

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“…MICP technology has been an emerging method in recent years. It cements loose soil particles into a whole using the microbially induced calcium carbonate crystals, thus improving the soil's mechanical behavior [8][9][10]. MICP fixation method can remarkably enhance the strength and stiffness of soil.…”

Section: Introductionmentioning

confidence: 99%

Shear Strength Behaviors of Aeolian Sand Solidified by Microbially Induced Calcite Precipitation and Basalt Fiber Reinforcement

Li,

Liu,

Zhang

et al. 2023

Materials

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Aeolian sand flow is identified as the main factor in the formation of sandstorms. However, conventional sand fixation methods cannot meet the current development requirements of environmental protection. In this paper, the method using Microbially Induced Calcite Precipitation (MICP) combined with basalt fiber reinforcement (BFR) was adopted to solidify the aeolian sand. Consolidated undrained triaxial shear tests were carried out to analyze the influence of fiber content, fiber length, confining pressure, and other factors on stress–strain characteristics, peak strength, brittleness index, and shear strength of aeolian sand. A shear strength model of aeolian sand solidification using MICP-BFR and considering the effect of fiber length and fiber content is established according to the test results. The results show that the peak strength of aeolian sand solidified by MICP-BFR is remarkably higher than that of aeolian sand solidified by MICP alone, and the peak strength rises with the increasing fiber length, fiber content, and confining pressure. The application of fiber can effectively reduce the brittleness index of aeolian sand solidified by MICP and improve the sample ductility. As fiber content and fiber length increase, the cohesion of solidified aeolian sand increases while the internal friction angle changes relatively little. In the limited range set by the test, the fiber length of 12 mm and the fiber content of 1.0% constitute the optimum reinforcement condition. The test results coincide with the model prediction results, indicating that the new model is fitting for predicting the shear strength of aeolian sand solidified by MICP-BFR. The research results provide an important reference value for guiding the practice of wind prevention and sand fixation in desert areas.

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Mechanical behaviour of MICP-treated silty sand

Cited by 21 publications

References 54 publications

Effect of Cementation Ratio and Molarity on Mechanical Properties of MICP-Treated Sand Subjected to Freeze-Thaw Cycles

Effect of Cementation Ratio and Molarity on Mechanical Properties of MICP-Treated Sand Subjected to Freeze-Thaw Cycles

Novel Understandings of Biomineralization in Backfill Materials: A Fundamental Investigation of Coal Gangue and Fly Ash Impact on B. pasteurii to Enhance Material Properties

Shear Strength Behaviors of Aeolian Sand Solidified by Microbially Induced Calcite Precipitation and Basalt Fiber Reinforcement

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