Influence of Confinement and Cementation Level on the Behavior of Microbial-Induced Calcite Precipitated Sands under Monotonic Drained Loading

Feng, Kai; Montoya, Brina M.

doi:10.1061/(asce)gt.1943-5606.0001379

Cited by 242 publications

(113 citation statements)

References 19 publications

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“…Based on this phenomenon, a bioslurry having high urease activity was successfully produced in aqueous medium. In conventional MICP process, multiple injections of bacteria are needed to maintain the urease activity and achieve a high level of cementation (Cheng and CordRuwisch 2012;Feng and Montoya 2016). However, in the proposed bioslurry approach, an introduction of different levels of urease activity can be simply achieved by controlling the level of urease activity per amount of soil during the mixing step via regulating the ratio between the bioslurry and soil.…”

Section: Discussionmentioning

confidence: 99%

“…The feasibility of such treatment method was further demonstrated in a large-scale trial (100 m 3 ) by Van Paassen et al (2010); however, the outcomes indicated varied strength of products from loosely cemented sand to moderately strong rock with varied unconfined compressive strength (UCS) between 0.7 and 12 MPa as a result of the nonuniform distribution of CaCO 3 precipitation. Feng and Montoya (2016) tested the behavior of sand treated with MICP under confined pressure using the two-phase injection method and the results indicated a nonuniform calcium carbonate distribution along the tested sand column (scale of cm), especially after heavy cementation (i.e., >4% calcium carbonate with variation of more than 40%). Similar heterogeneity of cementation distribution was also reported by Martinez et al (2013).…”

Section: Introductionmentioning

confidence: 99%

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Urease active bioslurry: a novel soil improvement approach based on microbially induced carbonate precipitation

2016

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This paper presents a novel approach for soil stabilization by microbially induced carbonate precipitation (MICP) using a new urease active catalyzer, named herein as "bioslurry". The bioslurry, which was produced from the reaction between bacterial culture and 400 mmol/L of CaCl 2 and urea, is pre-formed urease active crystals consisting of CaCO 3 plus imbedded urease active bacterial cells. By mixing the bioslurry with sand, more than 95% of the bioslurry was retained in the soil matrix as a result of the mechanical trapping mechanism, leading to high resistance to flushing with a low-salinity solution. The retained urease activity of bioslurry was uniformly distributed along the sand matrix, resulting in a rather uniform CaCO 3 precipitation. Through repeated treatments with a cementation solution, the unconfined compressive strength of bioslurry treated sand was significantly improved due to the effective CaCO 3 precipitation at the contact points of soil grains. Scanning electron microscopy analysis carried out on the bioslurry treated sand revealed that the induced large rhombohedral CaCO 3 crystals were localized around the bioslurry spherical fine crystals. The overall outcome of this work is that soil biocementation using the new bioslurry approach is controllable, reproducible, and homogeneous.Key words: bioslurry, microbially induced carbonate precipitation (MICP), biocementation, ground improvement, soil stabilization.Résumé : Cet article présente une approche novatrice pour la stabilisation des sols par précipitation des carbonates induite par voie microbienne (microbially induced carbonate precipitation, MICP) en utilisant un nouveau catalyseur actif uréase, appelée ici la « boue-bio ». La boue-bio qui a été produite de la réaction entre la culture bactérienne et 400 mmol/L de CaCl 2 et de l'urée, est composée de cristaux actifs uréase préformée consistant en CaCO 3 ainsi que des cellules bactériennes actives uréases incrustées. En mélangeant la boue-bio avec du sable, plus de 95 % de la boue-bio a été maintenue dans la matrice du sol en raison du mécanisme de piégeage mécanique, conduisant à une haute résistance au rinçage d'une solution à faible salinité. L'activité uréase retenue de la boue-bio a été uniformément répartie le long de la matrice de sable, ce qui entraîne une précipitation assez uniforme de CaCO 3 . Grâce à des traitements répétés avec une solution de cimentation, la résistance en compression non confinée de sable traité à la boue-bio a été significativement améliorée en raison des précipitations en CaCO 3 efficaces au niveau des points de contact des grains de sol. L'analyse par microscopie électronique à balayage du sable traité à la boue-bio a révélé que les grands cristaux induits de CaCO 3 rhomboédriques ont été localisés autour des fins cristaux sphériques de la boue-bio. Le résultat global de ce travail est que la biocimentation du sol en utilisant la nouvelle approche de boue-bio est contrôlable, reproductible et homogène. [Traduit par la Rédaction] Mots-clés : bo...

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Urease active bioslurry: a novel soil improvement approach based on microbially induced carbonate precipitation

2016

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“…The stiffness of fine sand was also enhanced by the interparticle bonds created by CaCO 3 (van Paassen, et al, 2009;Feng and Montoya, 2015;Lin et al, 2015). The dilation of fine sand was also enhanced by MICP (Chou et al, 2011;Feng and Montoya, 2015;Lin et al, 2015). Moreover, the undrained strength was improved to the point where loose sand was no longer collapsible under undrained monotonic loading (DeJong et al, 2006;Montoya and DeJong, 2015).…”

Section: Introductionmentioning

confidence: 85%

“…The increase in the shear strength of fine sand was observed with an increasing amount of precipitated CaCO 3 (Whiffin et al, 2007;Chou et al, 2011;Al Qabany and Soga, 2013;Feng and Montoya, 2015;Lin et al, 2015). The stiffness of fine sand was also enhanced by the interparticle bonds created by CaCO 3 (van Paassen, et al, 2009;Feng and Montoya, 2015;Lin et al, 2015).…”

Section: Introductionmentioning

confidence: 91%

Undrained cyclic triaxial testing on sand with non-plastic fines content cemented with microbially induced CaCO3

Sasaki

Kuwano

2016

Soils and Foundations

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“…Feng and Montoya [11] found that, at a given effective confining pressure, the stiffness, peak shear strength, and dilation of the soil increase with the calcite content [12,13]. Moreover, the ratio of urea and calcium chloride consumed in the columns has a linear relationship with the percentage of deposited calcium carbonate [14].…”

Section: Introductionmentioning

confidence: 99%

Mineralization Process of Biocemented Sand and Impact of Bacteria and Calcium Ions Concentrations on Crystal Morphology

Tang

Lian

et al. 2017

Advances in Materials Science and Engineering

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Microbial-induced calcite precipitation (MICP) is a sustainable technique used to improve sandy soil. Analysis of the mineralization process, as well as different bacterial suspensions and calcium concentrations on the crystal morphology, revealed that the mineralization process included four stages: self-organised hydrolysis of microorganisms, molecular recognition and interface interaction, growth modulation, and epitaxial growth. By increasing bacterial suspensions and calcium concentrations, the crystal morphology changed from hexahedron to oblique polyhedron to ellipsoid; the best crystal structure occurs at OD 600 = 1.0 and [Ca 2+ ] = 0.75 mol/l. It should be noted that interfacial hydrogen bonding is the main force that binds the loose sand particles. These results will help in understanding the mechanism of MICP.

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Influence of Confinement and Cementation Level on the Behavior of Microbial-Induced Calcite Precipitated Sands under Monotonic Drained Loading

Cited by 242 publications

References 19 publications

Urease active bioslurry: a novel soil improvement approach based on microbially induced carbonate precipitation

Urease active bioslurry: a novel soil improvement approach based on microbially induced carbonate precipitation

Undrained cyclic triaxial testing on sand with non-plastic fines content cemented with microbially induced CaCO3

Mineralization Process of Biocemented Sand and Impact of Bacteria and Calcium Ions Concentrations on Crystal Morphology

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