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

Sharma, Meghna; Satyam, Neelima; Tiwari, Nitin; Sahu, Shubham; Reddy, Krishna R.

doi:10.1007/s12517-021-07151-x

Cited by 19 publications

(6 citation statements)

References 68 publications

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“…Test setup for SEM and energy dispersive X‐ray spectroscopy (EDX) analysis has been shown in Figure A2f. Scanning electron microscopy tests were performed on gold‐coated samples at different magnifications at 15 KV beam intensity (Sharma et al, 2021b; Sharma, Satyam, Tiwari, et al, 2021). The binding of sand particles was observed by SEM images.…”

Section: Test Setupmentioning

confidence: 99%

Rock‐like strength enhancement of Indian desert sand using commercially available polysaccharide biopolymers

Dagliya,

Satyam,

Garg

2023

Soil Use and Management

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Biopolymers are a nature‐friendly solution that can impart rock‐like strength in sand by developing bonds between grains. In this study, we assessed the behaviour of desert sand treated with commercially available pectin (P), acacia gum (AG), and sodium alginate (SA) polysaccharide biopolymers (1 %, 2 %, and 3 % concentration) applied at 0.75 or 1 pore volume (PV). Non‐destructive ultrasonic pulse velocity (UPV) tests recorded maximum values of 1579 m/s for acacia gum samples, 1490 m/s for sodium alginate samples, and 1400 m/s for pectin samples, all showing rock‐like behaviour. Unconfined compressive strength (UCS) and split tensile strength (STS) tests showed that the strength level generally increased with biopolymer concentration. The minimum UCS value was 173 kPa for the Pectin (1%) 0.75 PV composition, and the maximum was 1287 kPa for the acacia gum (2%) 0.75 PV composition. The UCS value for the acacia gum (1%) 0.75 PV was 1178 kPa, with optimal results compared to other compositions. Scanning electron microscopy (SEM), energy dispersive X‐ray spectroscopy (EDX), and X‐ray diffraction (XRD) tests were performed for microstructural analysis. SEM revealed a strong bond between sand particles and biopolymers. EDX and XRD showed that the strength stemmed from gel formation in the pores, rather than mineralogical changes. The study results indicate the level of strength attained with varying biopolymer percentages and pore volumes and is useful for desert sand stabilization.

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Section: Test Setupmentioning

confidence: 99%

Rock‐like strength enhancement of Indian desert sand using commercially available polysaccharide biopolymers

Dagliya,

Satyam,

Garg

2023

Soil Use and Management

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“…In addition, MICP have been also utilized to improve strength of clay [8]. To create calcium carbonate minerals, the MICP method fundamentally forced metallic ions to interact with acidic radical ions [7,[9][10][11][12][13][14]. One of the most customary ways to cause carbonate precipitation is by hydrolyses of urea through addition of highly active urease producing microbes, namely Sporosarcina pasteurii [15].…”

Section: Introductionmentioning

confidence: 99%

Desert sand stabilization using biopolymers: review

Dagliya

Satyam

Garg

2023

Smart Constr. Sustain. Cities

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Wind-driven sand erosion is the leading primary reason of earth deterioration in dry lands and a major global issue. Desert dust emissions and topsoil degradation caused by wind pose a global danger to the ecosystem, economy, and individual health. The aim of the current study is to critically analyze the different types of biopolymers and their interaction mechanism with sands for desert sand stabilization. Extensive experimental data with different percentages of biopolymers has been presented on various wind erosion studies using wind tunnel testing and their control rate on desert sand stabilization. Also, studies related to evaluating the engineering properties of sand using biopolymers were analyzed. Other biological approaches, namely Microbial-induced calcite precipitation (MICP) and Enzyme-induced carbonate precipitation (EICP), have been discussed to regulate wind-driven sand erosion in terms of percentage calcite formation at different compositions of urea and calcium chloride. Comparative analysis of MICP and EICP with biopolymer treatment and their limitations have been discussed. Biopolymers are not only demonstrated adeptness in engineering applications but are also helpful for environment safety. Biopolymers are suggested to be novel and nature-friendly soil-strengthening material. This review focuses on the fundamental mechanisms of biopolymer treatment to reduce wind-driven sand loss and its future scope as a binder for sand stabilization. The mechanism of soil-biopolymer interaction under various soil conditions (water content, density, and grain size distribution) and climatic circumstances (drying-wetting cycles) needs to be explored. Furthermore, before applying on a large scale, one should evaluate sand-biopolymer interaction in terms of durability and viability.

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“…The urease enzyme is commonly used in microbially induced carbonate precipitation (MICP) and enzyme induced carbonate precipitation (EICP) to heal and strengthen soil. − MICP and EICP have been applied to repair and prevent soil erosion due to wind and water, suppress dust, repair cracks in concrete, reduce the permeability of soil, and increase the strength of soil. , The urease enzyme converts urea into ammonia and dissolved inorganic carbon which, in a calcium-rich environment, leads to the precipitation of calcite (CaCO 3 ), ,,, which is an ecofriendly cementation agent to strengthen soil. The soil-borne Sporosarcina pasteurii bacterium has been extensively studied for its ability to produce the urease enzyme. ,,,, Due to its widespread and soil-borne nature, the urease enzyme as produced by the S. pasteurii bacterium is a popular choice for use in soil strengthening .…”

Section: Introductionmentioning

confidence: 99%

“…1−4 MICP and EICP have been applied to repair and prevent soil erosion due to wind and water, suppress dust, repair cracks in concrete, reduce the permeability of soil, and increase the strength of soil. 5,6 The urease enzyme converts urea into ammonia and dissolved inorganic carbon which, in a calciumrich environment, leads to the precipitation of calcite (CaCO 3 ), 2,3,7,8 which is an ecofriendly cementation agent to strengthen soil. The soil-borne Sporosarcina pasteurii bacterium has been extensively studied for its ability to produce the urease enzyme.…”

Section: Introductionmentioning

confidence: 99%

Preferential Adsorption of Prominent Amino Acids in the Urease Enzyme of Sporosarcina pasteurii on Arid Soil Components: A Periodic DFT Study

et al. 2022

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The urease enzyme is commonly used in microbially induced carbonate precipitation (MICP) and enzyme-induced carbonate precipitation (EICP) to heal and strengthen soil. Improving our understanding of the adsorption of the urease enzyme with various soil surfaces can lead to advancements in the MICP and EICP engineering methods as well as other areas of soil science. In this work, we use density functional theory (DFT) to investigate the urease enzyme’s binding ability with four common arid soil components: quartz, corundum, albite, and hematite. As the urease enzyme cannot directly be simulated with DFT due to its size, the amino acids comprising at least 5% of the urease enzyme were simulated instead. An adsorption model incorporating the Gibbs free energy was used to determine the existence of amino acid–mineral binding modes. It was found that the nine simulated amino acids bind preferentially to the different soil components. Alanine favors corundum, glycine and threonine favor hematite, and aspartic acid favors albite. It was found that, under the standard environmental conditions considered here, amino acid binding to quartz is unfavorable. In the polymeric form where the side chains would dominate the binding interactions, hematite favors aspartic acid through its R–OH group and corundum favors glutamic acid through its R–Ket group. Overall, our model predicts that the urease enzyme produced by Sporosarcina pasteurii can bind to various oxides found in arid soil through its alanine, glycine, aspartic/glutamic acid, or threonine residues.

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

Cited by 19 publications

References 68 publications

Rock‐like strength enhancement of Indian desert sand using commercially available polysaccharide biopolymers

Rock‐like strength enhancement of Indian desert sand using commercially available polysaccharide biopolymers

Desert sand stabilization using biopolymers: review

Preferential Adsorption of Prominent Amino Acids in the Urease Enzyme of Sporosarcina pasteurii on Arid Soil Components: A Periodic DFT Study

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