Calcite precipitation induced by polyurethane-immobilized Bacillus pasteurii

Bang, S.; Galinat, Johnna K.; Ramakrishnan, V.

doi:10.1016/s0141-0229(00)00348-3

Cited by 548 publications

(252 citation statements)

References 8 publications

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“…In order to control the process, a reliable predictive model is needed. The Biogrout process is based on microbially induced carbonate precipitation (MICP) (Bang et al 2001;Cheng et al 2014;DeJong et al 2006) and is a bio-mediated soil improvement method (DeJong et al 2010(DeJong et al , 2013Ivanov and Chu 2008). The proposed variant of Biogrout is urea-based.…”

Section: Introductionmentioning

confidence: 99%

A Reactive Transport Model for Biogrout Compared to Experimental Data

et al. 2015

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Biogrout is a method for reinforcement of granular soil. In the Biogrout process, calcium carbonate is produced. This solid connects the grains, and therefore the strength of the soil is increased. The calcium carbonate is formed with the use of micro-organisms. Experiments and numerical simulations have been performed to demonstrate the process under various conditions. In this paper, it has been examined whether a reactive transport model can be used to describe a Biogrout experiment that was performed in a column with a length of 5 m. Four different models for the course of the reaction rate are considered. The concentration of micro-organisms and the reaction rate are fine-tuned in order to find a description of the experiment that is a best fit for the particular model. This is done by minimizing the error between the experimental and numerical results for the concentration of calcium carbonate and the by-product of the reaction. List of symbolsInjected concentration of micro-organisms (normalized) (1) S bac Ratio of micro-organisms that is fixated (with respect to the injected concentration) (1)

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Section: Introductionmentioning

confidence: 99%

A Reactive Transport Model for Biogrout Compared to Experimental Data

et al. 2015

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“…Biogrout is one of these techniques, which is based on microbial-induced carbonate precipitation (MICP). Several researchers have shown that MICP can be used to improve the mechanical properties of porous materials (Bang et al 2001;Bachmeier et al 2002;Nemati et al 2003;DeJong et al 2006;Whiffin et al 2007). Some examples of applications are • reinforcement of calcarenite room and pillar mines (Van Paassen et al 2008).…”

Section: Technological Perspectivementioning

confidence: 99%

A Mathematical Model and Analytical Solution for the Fixation of Bacteria in Biogrout

et al. 2012

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Biogrout is a new method for soil reinforcement, which is based on microbialinduced carbonate precipitation. Bacteria and reactants are flushed through the soil, resulting in calcium carbonate precipitation and consequent soil reinforcement. Bacteria are crucially important in the Biogrout process since they catalyse the reaction. Hence, to control the process, it is essential to know where the bacteria are located. The bacteria are possibly in suspension but can also be adsorbed or fixated on the matrix of the porous structure. In this article, a model is derived for the placement of bacteria. The model contains three phases of bacteria: bacteria in suspension, adsorbed bacteria and fixed bacteria. An analytical solution is derived for instantaneous reactions between these three phases. The analytical solution is compared to numerical simulations for finite reaction rates. For the numerical simulations the standard Galerkin Finite Element Method is used.

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“…Significant conclusions arise from these studies. Controversially, Bang et al (11) and Bachmeier et al (12) suggested that bio-deposited calcite might contribute to an increase in the compressive strength, yet it would not act as a binder, and thus the encapsulation would not have a negative effect. Later, Bang et al (13) studied the durability and mechanical properties of mortars which included encapsulated bacteria and concluded that the maximum concentration of Bacillus Pasteurii should be 6x10 8 cell/cm 3 .…”

Section: Introductionmentioning

confidence: 99%

Effect of Sporosarcina Pasteurii on the strength properties of compressed earth specimens

Bernat-Masó¹,

Gil²,

Escrig³

et al. 2018

Mater. construcc.

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Microbial biodeposition of calcite induction for improving the performance of rammed earth is a research area that must be analysed in a representative environment. This analysis must consider the compaction force, particle size distribution and curing process as production variables. This paper investigates the effects of adding specific bacteria, Sporosarcina Pasteurii, into compressed earth cubes and the effect of production variables. Uniaxial compressive tests and direct shear tests have been conducted for 80 specimens. The results indicate that calcite precipitation interacts with the drying process of clay/silt resulting in reducing the compressive strength, the apparent cohesion and the friction angle. Finally, bacterial activity, which is more likely in samples cured in a high humidity environment, tends to reduce the dilatancy effect. RESUMEN: Efecto de la Sporosarcina Pasteurii en las propiedades resistentes de especímenes de tierra comprimida.Inducir la biodeposición microbiana de calcita para mejorar las prestaciones de la tapia es una línea de investigación que necesita ser analizada en condiciones representativas y teniendo en cuenta variables de producción como la fuerza de compactación, la granulometría o el curado a diferentes humedades. Se estudia el efecto de añadir Sporosarcina Pasteurii en cubos de tierra comprimida y la influencia de estas variables de producción. Se han realizado ensayos de compresión simple y corte directo sobre 80 especímenes producidos con dos niveles de compactación y dos granulometrías. Los resultados indican que la precipitación de calcita interactúa con el proceso de secado de los limos/arcillas dando como resultado una reducción de la resistencia a compresión, de la cohesión aparente y del ángulo de fricción. Finalmente, la actividad bacteriana, más probable en las muestras curadas en un entorno de alta humedad, tiende a reducir el efecto de la dilatancia.PALABRAS CLAVE: Carbonato cálcico; Material orgánico; Curado; Resistencia a la Compresión; Caracterización ORCID ID: E. Bernat-Masó

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Calcite precipitation induced by polyurethane-immobilized Bacillus pasteurii

Cited by 548 publications

References 8 publications

A Reactive Transport Model for Biogrout Compared to Experimental Data

A Reactive Transport Model for Biogrout Compared to Experimental Data

A Mathematical Model and Analytical Solution for the Fixation of Bacteria in Biogrout

Effect of Sporosarcina Pasteurii on the strength properties of compressed earth specimens

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