Durability of microbially induced calcite precipitation (micp) treated cohesionless soils

Muthukkumaran, Kasinathan; Shashank, B. S.

doi:10.3208/jgssp.ind-23

Cited by 11 publications

(4 citation statements)

References 6 publications

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“…Also, soil particles binding and the clogging of openings in the soil skeleton as calcite are formed to fill such spaces led to lessening of the UHC. Abo-El-Enein et al, [37], Muthukkumaran and Bettadapura [38], Chi et al, [17].) reported similar results.…”

Section: Impact Of Microbial Density On Unsaturated Hydraulic Conductivity (Uhc)mentioning

confidence: 69%

A comparative study of soil-water characteristic curves for compacted lateritic soil – bacillus coagulans mixtures

et al. 2021

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A comparative study of soil-water characteristic curves (SWCCs) for compacted lateritic soil ̶ Bacillus coagulans (B. coagulans) mixtures for municipal solid waste (MSW) application was studied. Soil treatment was performed at approximately about one-third pore volume of the microbes (i.e., B. coagulans) for suspension densities of 0, 1.5×108, 6.0×108, 1.2×109, 1.8×109 and 2.4×109cells/ml, correspondingly. Soil specimens were prepared at optimum moisture content (OMC) of British Standard light (BSL) compaction energy. Cementation reagent was applied on the compacted soil and permitted to penetrate until partial saturation was achieved. A set-up of pressure plate extractor was employed to measure the volumetric water content, θ (VWC) in the laboratory for varying matric suctions with a minimum of 10 kPa up to a maximum of 1,500 kPa. The unsaturated hydraulic conductivity (UHC) and VWC were assessed using Brooks - Corey (BC) and Fredlund - Xing (FX) models. Largely, BC and FX models overrated the VWC. Also, the VWC decreased with higher matric suction for the two models considered and the laboratory measured values. The UHC predicted for matric suctions of 500 and 1,500 kPa initially decreased for B. coagulans suspension density up to 1.2×109 cells/ml for BC and FX models, with the exception of a few cases, but thereafter increased with increase in microbial density. For FX model at 1,500 kPa, UHC values of 2.42×10–9, 2.02×10–9, 9.31×10–10, 8.09×10–10 , 1.29×10–9 and 2.27×10–9m/s were recorded at 0, 1.5×108, 6.0×108, 1.2×109, 1.8×109 and 2.4×109cells/ml, respectively. In the case of BC model, values of 2.26×10–17, 1.41×10–14, 2.2×10–14, 4.6×10–19 , 3.25×10–17 and 2.45×10–14m/s were recorded at 0, 1.5×108, 6.0×108, 1.2×109, 1.8×109 and 2.4×109cells/ml, respectively. Thus, the FX model met the design maximum hydraulic conductivity value of 1 x 10–9 m/s requirement for MSW system when lateritic soil was treated with B. coagulans suspension density of 1.2×109 cells/ml, while the BC model satisfied the requirement for all the microbial densities considered and it is recommended for modelling of UHC of lateritic soil admixed with B. coagulans for MSW containment application.

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Section: Impact Of Microbial Density On Unsaturated Hydraulic Conductivity (Uhc)mentioning

confidence: 69%

A comparative study of soil-water characteristic curves for compacted lateritic soil – bacillus coagulans mixtures

et al. 2021

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“…For soil improvement, one major limitation or concern for the application of bioclogging in situ is the stability of the microbial biomass in soil [4]. It is known that both the bacterial cells, biofilm and the nutrient in the soil can be degraded, leading to the weakening or even failure of bioclogging effect [90]. By contrast, the stability or durability of the calcium carbonate in the soil is much better [90,91].…”

Section: Biocloggingmentioning

confidence: 99%

“…It is known that both the bacterial cells, biofilm and the nutrient in the soil can be degraded, leading to the weakening or even failure of bioclogging effect [90]. By contrast, the stability or durability of the calcium carbonate in the soil is much better [90,91].…”

Section: Biocloggingmentioning

confidence: 99%

Recent development in biogeotechnology and its engineering applications

Cui

Chu

2021

Front. Struct. Civ. Eng.

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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.

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“…Bio-clogging and Bio-cementation are the two notable applications among many in MICP. Bio-clogging is a process that involves the lessening of the hydraulic conductivity of soil and porous rocks by a materials pore filling the soil void, produced by microbial activity [8]. On the other hand, Bio-cementation improves the workability, strength and the corresponding stiffness of soil and rocks via microbial activity [9].…”

Section: Introductionmentioning

confidence: 99%

Effect of Treatment Compositions on the Plasticity of Tropical Red Soil Treated with Bacillus Coagulans

Yohanna¹,

Osinubi²,

Eberemu³

et al. 2022

J. Civ. Eng. Constr.

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The study evaluated the effect of four treatment compositions on the plasticity of tropical red soil (Lateritic soil) admixed with Bacillus coagulans (B. coagulans). Samples for Atterberg limits test were prepared using four treatment compositional variables. They include 25% B. coagulans suspension and 75% cementation reagent, (25%B /75%C); 50% B. coagulans suspension and 50% cementation reagent (50% B /50%C); 75% B. coagulans suspension and 25% cementation reagent, (75%B /25% C) with the above three being in equivalent volumes of the corresponding liquid limit(LL) and 50% of the optimum moisture content (OMC) of compaction, to be both B. coagulans suspension and cementation reagent (i.e. 50% OMC B /50%OMC C) of the natural soil. Results showed that the LL for; 25%B /75% C, 50% B /50% C and 75% B /25%C generally increased from 0 up to peak values at 1.8 x 109 cells/ml and then declined at 2.4 x 109 cells/ml. In the case of samples treated with 50% OMC B/50% OMC C, the LL initially decreased from 0 up to 6.0 x 108 cells/ml and thereafter increased significantly. Plastic limit (PL), Plasticity index (PI) and Linear shrinkage (LS), recorded improvement. Regression analysis for the best treatment composition (i.e 75%B /25%C) has regression coefficient of 91.8%. Based on the four treatment compositions considered, 75%B/25%C enhanced the soil workability significantly and is suggested for geotechnical engineering applications such as road pavements that are lightly trafficked.

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Durability of microbially induced calcite precipitation (micp) treated cohesionless soils

Cited by 11 publications

References 6 publications

A comparative study of soil-water characteristic curves for compacted lateritic soil – bacillus coagulans mixtures

A comparative study of soil-water characteristic curves for compacted lateritic soil – bacillus coagulans mixtures

Recent development in biogeotechnology and its engineering applications

Effect of Treatment Compositions on the Plasticity of Tropical Red Soil Treated with Bacillus Coagulans

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