Physical-mechanical properties of microbially induced calcite precipitation-treated loess and treatment mechanism

Zhang, Hao-nan; Jia, Cangqin; Wang, Guihe; Su, Fei; Sun, Yong-shuai; Fan, Chang-yi

doi:10.1007/s11629-022-7336-3

Cited by 8 publications

(3 citation statements)

References 77 publications

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“…pasteurii (ATCC 11859) has a strong capacity to produce urease, which facilitates the hydrolysis of urea. The surface of the bacterium, including the cell walls and extracellular polymers, exhibits a greater negative charge than nonmineralized bacteria. − This results in a stronger adsorption effect on cations, which facilitates the formation of nucleation sites for carbonate crystals . Consequently, it has been extensively used in various engineering projects.…”

Section: Methodsmentioning

confidence: 99%

Microbial Synergistic Active Magnesium Oxide Solidification of Water-Based Drilling Cuttings and Analysis of Its Durability Strength Loss Mechanism

Zhou,

Wang,

Tang

et al. 2024

ACS Sustainable Chem. Eng.

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The solidification, recycling, and reuse of water-based drilling cuttings (WDC), a waste generated during oil and gas extraction, has been the subject of intense research interest. Developing an efficient and environmentally friendly solidification method is the key objective of this research. This study employs microbial synergistic active magnesium oxide (MgO) technology to solidify WDC. The solidifying mechanism is that carbonate ions produced by microbial metabolism and hydrolysis of urea were able to react with magnesium hydroxide generated by hydration to produce different types of hydrated magnesium carbonates (HMCs), which filled the pores between the drilling cutting particles while bonding the particles to form water-based drilling cutting solidified body (WDCS). The durability and strength of the WDCS were evaluated by subjecting the WDCS to 10 freeze−thaw (FT) cycles and 6 dry-wet (DW) cycles. The main phases in the WDCS are SiO 2 , CaCO 3 , MgO, Mg(OH) 2 , hydromagnesite, and barringtonite. Notably, the mass and density of WDCS decreased significantly after DW cycles. The strength of WDCS improved during roomtemperature curing conditioning (at 25 °C, the curing time corresponds to the durability test). However, it decreased by 23 and 75% following the FT and DW cycles, respectively. Further analysis indicates that the strength loss is related to the crystallinity and content of the main phases in WDCS, as well as changes in the pore structure. The crystallinity and content of the WDCS main phases are lower after the DW cycle than after the FT cycle. This is also consistent with changes in strength. The internal pore structure of WDCS changed differently under different cycling conditions. In comparison to the FT cycle, the number of WDCS internal pores increased following the DW cycle, and the pore size distribution exhibited uniformity and continuity.

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Section: Methodsmentioning

confidence: 99%

Microbial Synergistic Active Magnesium Oxide Solidification of Water-Based Drilling Cuttings and Analysis of Its Durability Strength Loss Mechanism

Zhou,

Wang,

Tang

et al. 2024

ACS Sustainable Chem. Eng.

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“…In recent years, microbial-induced calcium carbonate (CaCO 3 ) precipitation (MICP) technology, as a new foundation treatment technology, has been widely used in sand reinforcement [7][8][9][10], rock crack repair [11][12][13][14], contaminated soil treatment [15][16][17][18], slope erosion resistance [19][20][21], and so on. It has the advantages of convenient construction, low cost, and environmental friendliness.…”

Section: Introductionmentioning

confidence: 99%

“…When other conditions such as bacterial activity, concentration, and pH value were consistent, the amount of CaCO 3 precipitation induced by microorganisms decreased with increasing temperature. Peng et al [29] conducted an MICP aqueous solution test and a sand column test under three different temperature environments (10,20, and 30 • C). The results showed that the bacterial activity decreased with an increase in temperature.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of MICP-Solidified Calcareous Sand Based on Ambient Temperature Variation in the South China Sea

Yang

Zhou

et al. 2023

Sustainability

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With the continuous advancement of the construction of the Hainan Free Trade Port and Island Reef Project, deploying Microbial Induced Calcium Carbonate Precipitation (MICP technology) for related research on the temperature range in this area would be of great significance. MICP technology is an innovative and sustainable new soil reinforcement technology that uses the metabolic activity of specific bacteria to produce calcium carbonate precipitation (CaCO3) to connect loose soil. A few previous studies reporting on the applications of MICP technology in different temperature environments drew different conclusions. Therefore, this study involved MICP sand column reinforcement tests at ambient temperatures of 20 °C, room temperature, 30 °C, and 40 °C. The reinforcement effect was evaluated using indicators such as CaCO3 generation rate, Ca2+ conversion rate, bacterial adhesion rate, water absorption rate, and unconfined compressive strength, providing a reference basis for the future applications of MICP technology to island and reef engineering construction. The results showed that, with an increase of temperature from 20 °C to 40 °C, the CaCO3 production rate, Ca2+ conversion rate, and unconfined compressive strength showed a trend of first increasing and then decreasing; the UCS was 548 KPa at 20 °C and 2276.67 KPa at 30 °C; the water absorption rate at 20 °C was 25.32, which decreased continuously with increasing temperature, and reached 21.49 at 40 °C; and the bacterial adhesion rate also continued to rise in the range of 20 °C to 40 °C, from 10.91 to 28.44. The increase in temperature had an impact on the physiological state of bacterial cells. A scanning electron microscope test shows that CaCO3 crystal forms generated under different temperature environments were different, and the CaCO3 mineral deposits generated during MICP reinforcement at 30 °C were denser. Fewer gaps were present between adjacent sand particles, and the bond was tight, which served better as a bridge. The strength of the solidified sample was also higher. The annual average temperature of the South China Sea is about 30 °C. The findings of this experiment provide feasibility and sustainable development for MICP project reinforcement in the South China Sea.

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Multi-scale analysis of the mechanism of microbially induced calcium carbonate precipitation consolidation loess

Zhou

Wang

Zhang

et al. 2023

Environ Sci Pollut Res

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Physical-mechanical properties of microbially induced calcite precipitation-treated loess and treatment mechanism

Cited by 8 publications

References 77 publications

Microbial Synergistic Active Magnesium Oxide Solidification of Water-Based Drilling Cuttings and Analysis of Its Durability Strength Loss Mechanism

Microbial Synergistic Active Magnesium Oxide Solidification of Water-Based Drilling Cuttings and Analysis of Its Durability Strength Loss Mechanism

Experimental Study of MICP-Solidified Calcareous Sand Based on Ambient Temperature Variation in the South China Sea

Multi-scale analysis of the mechanism of microbially induced calcium carbonate precipitation consolidation loess

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