Development of an Improved Immersing Method to Enhance Microbial Induced Calcite Precipitation Treated Sandy Soil through Multiple Treatments in Low Cementation Media Concentration

Wen, Kejun; Li, Yang; Liu, Shihui; Bu, Changming; Li, Lin

doi:10.1007/s10706-018-0669-6

Cited by 60 publications

(17 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Table 1 summarizes all the chemical solution with the components and concentrations used in this study. The 0.5 M concentrations of urea and CaCl 2 .2H 2 O were used to achieve a uniform and significant calcite precipitation (Wen et al., 2019). The type of water used for solution preparation and solution sterilization condition are also shown in Table 1 for both tube and PVC sand column treatments.…”

Section: Methodsmentioning

confidence: 99%

Hybrid bacteria mediated cemented sand: Microcharacterization, permeability, strength, shear wave velocity, stress-strain, and durability

Sharma

Satyam

Reddy

2021

International Journal of Damage Mechanics

View full text Add to dashboard Cite

Microbially induced calcite precipitation (MICP), a sustainable approach for sand biocementation, was investigated in previous studies based on metabolic activity of individual microorganisms. The individual bacteria, specifically Sporosarcina pasteurii (SP), Bacillus subtilis (BS), and Lysinibacillus sphaericus (LS), were found capable enough for sand biocementation. However, present study investigates synergistic effects of using bacterial-hybrids on cementation and consequent improvement in sand properties. The SP, BS, and LS strains were used in different combinations to create bacterial-hybrids and applied under simulated non-sterile field conditions. Initially, sand biotreatment was carried out in plastic tubes up to 14 days, using bacterial mixtures and 0.5 M cementation solution. Biocemented specimens were tested for calcite precipitation, XRD, FTIR, and SEM. The SP and LS combination (SPLS hybrid) showed maximum calcite precipitation, which is further used for biotreatment to create cylindrical sand samples for testing improved engineering properties. These samples were prepared using 0.5 M cementation solution in three pore volumes (1, 0.75, and 0.5 PV) and treatment cycles (12, 24, and 48 hrs TC) up to 18 days. Biocemented samples were tested for permeability (6th, 12th, and 18th days of biotreatment), unconfined compressive strength (UCS), split tensile strength (STS), ultrasonic pulse velocity (UPV), and consolidated undrained stress-strain response. Durability of biocementation was also investigated by determining reduction in strength and UPV subjected to freeze-thaw (FT) cycles (5, 10, 15, and 20). The results showed maximum UCS of 1902 kPa, STS of 356 kPa, UPV of 2408 m/s, and coefficient of permeability reduction up to 91%. The higher results were achieved with 11.11% calcite content in 1PV-12TC treated samples. The 1PV-12TC treated samples resulted in 4.2%, 8.3%, 17%, and 35% reduction of strength after 5, 10, 15, and 20 FT cycles, respectively. Overall, biocementation using hybrid bacteria is shown significant to improve sand's engineering properties, including potential to mitigate liquefaction.

show abstract

Section: Methodsmentioning

confidence: 99%

Hybrid bacteria mediated cemented sand: Microcharacterization, permeability, strength, shear wave velocity, stress-strain, and durability

Sharma

Satyam

Reddy

2021

International Journal of Damage Mechanics

View full text Add to dashboard Cite

show abstract

“…The lower cementation media concentration requires more number of treatments and higher cementation media concentration leads to the formation of larger size crystals with significant amount of calcite precipitation (Wen et al 2019b;Sharma et al 2019). Therefore, it is necessary to optimize the cementation media concentration.…”

Section: Effect Of Bacteria and Cementation Media Concentration On Calcite Precipitationmentioning

confidence: 99%

Simplified biogeochemical numerical model to predict pore fluid chemistry and calcite precipitation during biocementation of soil

et al. 2021

View full text Add to dashboard Cite

Microbially induced calcite precipitation (MICP) technique has gained attention recently as a novel method to enhance the engineering properties of soils, especially sandy soils. However, the applicability of this method to field scale is challenging and requires understanding of the factors affecting MICP process under variable subsurface conditions. This study presents a laboratory investigation and numerical predictive model to assess pore-water chemistry and calcite precipitation during the biocementation process. Laboratory experiments were conducted to assess the microbial treatment of Narmada sand in plastic tubes using three bacterial strains and two cementation media concentrations. Calcite precipitation via ureolysis as a result of biogeochemical reactions was measured. The effects of pH and electrical conductivity (EC) on the rate of urea hydrolysis and calcite precipitation were assessed. The presence of calcite crystals was analyzed using scanning electron microscopy (SEM). The SEM images confirmed the formation of calcite at the surface and between the sand particles. A simplified numerical model was developed to estimate the rate of urea hydrolysis and their effects on the biocementation of sand. Three stages of MICP process were identified: bacterial ureolysis, dynamic equilibrium between liquid-gas interface and oversaturation of ions, and calcite precipitation. The variations of pH and EC at these three stages were modeled. The predicted pH, EC, and calcite precipitation based on the simplified model were found to be in close agreement with the experimental results. The numerical model can be used to assess and optimize the system variables for effective MICP field applications.

show abstract

“…Velpuri et al [229] also considered that a higher CCS would lead to a more severe clogging at the injection point, and thus a more non-uniformly cemented specimen. Mori et al [230] stated that low CCS could result in a more homogeneous pattern of calcite precipitation due to more nucleation sites than that of high CCS. Al-Thawadi and Cord-Ruwisch [32] also reported that the size of the crystal increased with the CCS.…”

Section: Cementation Solution Parametersmentioning

confidence: 99%

Recent development in biogeotechnology and its engineering applications

Cui

Chu

2021

Front. Struct. Civ. Eng.

View full text Add to dashboard Cite

Microbial geotechnology or biogeotechnology is a new branch of geotechnical engineering. It involves the use of microbiology for traditional geotechnical applications. Many new innovative soil improvement methods have been developed in recent years based on this approach. A proper understanding of the various approaches and the performances of different methods can help researchers and engineers to develop the most appropriate geotechnical solutions. At present, most of the methods can be categorized into three major types, biocementation, bioclogging, and biogas desaturation. Similarities and differences of different approaches and their potential applications are reviewed. Factors affecting the different processes are also discussed. Examples of up-scaled model tests and pilot trials are presented to show the emerging applications. The challenges and problems of biogeotechnology are also discussed.

show abstract

Development of an Improved Immersing Method to Enhance Microbial Induced Calcite Precipitation Treated Sandy Soil through Multiple Treatments in Low Cementation Media Concentration

Cited by 60 publications

References 16 publications

Hybrid bacteria mediated cemented sand: Microcharacterization, permeability, strength, shear wave velocity, stress-strain, and durability

Hybrid bacteria mediated cemented sand: Microcharacterization, permeability, strength, shear wave velocity, stress-strain, and durability

Simplified biogeochemical numerical model to predict pore fluid chemistry and calcite precipitation during biocementation of soil

Recent development in biogeotechnology and its engineering applications

Contact Info

Product

Resources

About