Unconfined Compressive Strength Testing of Bio-cemented Weak Soils: A Comparative Upscale Laboratory Testing

Wani, K. M. N. Saquib; Mir, Bashir Ahmed

doi:10.1007/s13369-020-04647-8

Cited by 27 publications

(4 citation statements)

References 58 publications

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“… Increase in UCS after EICP treatment sourced from different studies [Data sourced from ( Park et al, 2014 ; Sharma and Ramkrishnan, 2016 ; Sotoudehfar et al, 2016 ; Moghal et al, 2020a ; Wani and Mir, 2020 ; Xiao et al, 2020 )]. …”

Section: Enzyme-induced Calcium Carbonate Precipitationmentioning

confidence: 99%

A Review of Enzyme-Induced Calcium Carbonate Precipitation Applicability in the Oil and Gas Industry

Alarifi

Mustafa

Omarov

et al. 2022

Front. Bioeng. Biotechnol.

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Enzyme-induced calcium carbonate precipitation (EICP) techniques are used in several disciplines and for a wide range of applications. In the oil and gas industry, EICP is a relatively new technique and is actively used for enhanced oil recovery applications, removal of undesired chemicals and generating desired chemicals in situ, and plugging of fractures, lost circulation, and sand consolidation. Many oil- and gas-bearing formations encounter the problem of the flow of sand grains into the wellbore along with the reservoir fluids. This study offers a detailed review of sand consolidation using EICP to solve and prevent sand production issues in oil and gas wells. Interest in bio-cementation techniques has gained a sharp increase recently due to their sustainable and environmentally friendly nature. An overview of the factors affecting the EICP technique is discussed with an emphasis on the in situ reactions, leading to sand consolidation. Furthermore, this study provides a guideline to assess sand consolidation performance and the applicability of EICP to mitigate sand production issues in oil and gas wells.

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Section: Enzyme-induced Calcium Carbonate Precipitationmentioning

confidence: 99%

A Review of Enzyme-Induced Calcium Carbonate Precipitation Applicability in the Oil and Gas Industry

Alarifi

Mustafa

Omarov

et al. 2022

Front. Bioeng. Biotechnol.

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“…To find the amount of CaCO 3 precipitated in the soil, acid digestion test was performed [58]. About 50 g of each tested soil samples were taken and immersed in the 1M HCL to dissolve the precipitated CaCO 3 and difference in the weights before and after dissolution were used to calculate the percentage of calcite precipitated.…”

Section: Measurement Of Caco 3 Precipitatesmentioning

confidence: 99%

Heavy Metal Immobilization Studies and Enhancement in Geotechnical Properties of Cohesive Soils by EICP Technique

Moghal

Lateef²,

Mohammed³

et al. 2020

Applied Sciences

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Soil treatment methods to cope with ever-growing demands of construction industry and environmental aspects are always explored for their suitability in different in-situ conditions. Of late, enzyme induced calcite precipitation (EICP) is gaining importance as a reliable technique to improve soil properties and for contaminant remediation scenarios. In the present work, swelling and permeability characteristics of two native Indian cohesive soils (Black and Red) are explored. Experiments on the sorption and desorption of multiple heavy metals (Cd, Ni and Pb) onto these soils were conducted to understand the sorptive response of the heavy metals. To improve the heavy metal retention capacity and enhance swelling and permeability characteristics, the selected soils were treated with different enzyme solutions. The results revealed that EICP technique could immobilize the heavy metals in selected soils to a significant level and reduce the swelling and permeability. This technique is contaminant selective and performance varies with the nature and type of heavy metal used. Citric acid (C6H8O7) and ethylene diamine tetra-acetic acid (EDTA) were used as extractants in the present study to study the desorption response of heavy metals for different EICP conditions. The results indicate that calcium carbonate (CaCO3) precipitate deposited in the voids of soil has the innate potential in reducing the permeability of soil up to 47-fold and swelling pressure by 4-fold at the end of 21 days of curing period. Reduction in permeability and swell, following EICP treatment can be maintained with one time rinsing of the treated soil in water to avoid dissolution of precipitated CaCO3. Outcomes of this study have revealed that EICP technique can be adopted on selected native soils to reduce swelling and permeability characteristics followed by enhanced contaminant remediation enabling their potential as excellent landfill liner materials.

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“…Therefore, when constructing embankment subgrade for a railway, deformation characteristics such as time-dependent settlement according to the material characteristics are important. Various studies on settlement and strength characteristics according to the change in embankment material have been conducted through laboratory tests, such as behavior according to soil grain size [14][15][16] and cement content [17]. Some researches through field measurement have been conducted on bridge foundations [18] and soft ground improvement [19], but long-term field measurement studies on embankment materials are scarce.…”

Section: Introductionmentioning

confidence: 99%

Field studies on low and fast compressibility of cement-mixed gravel in railway embankment construction

Kim,

Kim

2023

PLoS ONE

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The cement-mixed gravel, which is used in the construction of railway embankment, is a relatively more expensive material compared to sandy soil. Having said that, it is used where small residual settlement is required for example, abutment transition zone, due to characteristic of higher strength than sandy soil. In this paper, the time-dependent settlement were evaluated using field data measured over a long period of time at two RSR (Reinforced Subgrade for Railways) construction sites using two different backfill materials (sandy soil and cement-mixed gravel). The embankment settlement with cement-mixed gravel as a backfill material was reduced by 78% compared to that with sandy soil. Further, the period for stabilizing the embankment before installation of the railway track was significantly reduced with cement-mixed gravel as a backfill material.

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Unconfined Compressive Strength Testing of Bio-cemented Weak Soils: A Comparative Upscale Laboratory Testing

Cited by 27 publications

References 58 publications

A Review of Enzyme-Induced Calcium Carbonate Precipitation Applicability in the Oil and Gas Industry

A Review of Enzyme-Induced Calcium Carbonate Precipitation Applicability in the Oil and Gas Industry

Heavy Metal Immobilization Studies and Enhancement in Geotechnical Properties of Cohesive Soils by EICP Technique

Field studies on low and fast compressibility of cement-mixed gravel in railway embankment construction

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