Effect of Soil Type on the Enzymatic Calcium Carbonate Precipitation Process Used for Soil Improvement

Oliveira, Paulo J. Venda; Freitas, Luís de Souza; Carmona, João P. S. F.

doi:10.1061/(asce)mt.1943-5533.0001804

Cited by 85 publications

(35 citation statements)

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“…While the strength of these stabilized sand-silt samples is reduced by increase the fines percentage, the higher fines presence increases the treated sample's ductility. These findings are consistent with the results published by Oliveira et al (2016).…”

Section: R a F Tsupporting

confidence: 94%

“…On the other hand,Kavazanjian and Hamdan (2015) observed a similarly increased level of CaCO 3 formation with EICP processing after adding bentonite to sand. Interestingly, though, their EICP tests were not able to form an intact, stabilized column Oliveira et al (2016). similarly reported elevated CaCO 3 precipitation levels (reaching 17%) being developed during plant-based EICP tests on a heavily compacted sand-silt-clay soil mixture (i.e., at respective 73.4%, 23.8%, and 2.8% silt levels), and here again their finished product UCS (i.e., ~250 kPa) was low.…”

mentioning

confidence: 95%

“…In turn, at that point in time (circa 2015) MICP did not appear to be well suited to soil systems bearing finer-grained, higher plasticity soils which would then impede bacterial migration. The validity of this concern, though, is now unclear given that a limited number of more recently published papers have claimed successful MICP use with residual soil and silty sand soil (Lee et al 2013;Soon et al 2013Soon et al , 2014Oliveira et al 2016;Jiang et al 2017).…”

mentioning

confidence: 99%

“…The more recent EICP papers (using plant and commercial enzyme sources) have also largely focused on sand-based soil applications, with limited consideration of more complex soil mixtures with higher plasticity. Five of these papers, though, did study varying sand, silt, clay, and/or dust mixtures (Bang et al 2009;Kavazanjian and Hamdan 2015;Oliveira et al 2016;Kavazanjian et al 2017), although with varying degrees of success. For example, Oliveira et al (2016) reported relatively low unconfined strength results D r a f t (i.e., with a maximal 250 kPa UCS strength outcome) when treating a combined sand, silt, and clay soil using EICP processing.…”

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confidence: 99%

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Sand and silty-sand soil stabilization using bacterial enzyme–induced calcite precipitation (BEICP)

et al. 2019

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This paper examines the bio-derived stabilization of sand-only or sand-plus-silt soils using an extracted bacterial enzyme application to achieve induced calcite precipitation (ICP). As compared to conventional microbial induced calcite precipitation (MICP) methods, which use intact bacterial cells, this strategy that uses free urease catalysts to secure bacterial enzyme–induced calcite precipitation (BEICP) appears to offer an improved means of bio-stabilizing silty-sand soils as compared to that of MICP processing. Several benefits may possibly be achieved with this BEICP approach, including bio-safety, environmental, and geotechnical improvements. Notably, the BEICP bio-stabilization results presented in this paper demonstrate (i) higher rates of catalytic urease activity, (ii) a wider range of application with sand-plus-silt soil applications bearing low-plasticity properties, and (iii) the ability to retain higher levels of soil permeability after BEICP processing. Comparative BEICP versus MICP results for sand-only systems are presented, along with BEICP-based results for stabilized soil mixtures at 90:10 and 80:20 percentile sand:silt ratios. This BEICP method’s ability to obtain unconfined compressive strength results in excess of 1000 kPa with sand-plus-silt soil mixtures is particularly noteworthy.

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Section: R a F Tsupporting

confidence: 94%

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confidence: 95%

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confidence: 99%

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confidence: 99%

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Sand and silty-sand soil stabilization using bacterial enzyme–induced calcite precipitation (BEICP)

et al. 2019

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“…Venda Oliveira et al (2016) mostraram que esta técnica é potenciada em solos arenosos de granulometria extensa, sendo pouco eficaz em solos orgânicos. Alguns trabalhos também têm mostrado que a utilização de elevada concentração de enzimas e reagentes pode diminuir a eficácia do processo (Yasuhara et al, 2012;Nemati e Voordouw 2003).…”

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Biocimentação de um solo arenoso com recurso a enzimas: efeito de diversos fatores

Carmona¹,

Oliveira²,

Lemos³

2017

geotecnia

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RESUMO -Neste trabalho apresentam-se os resultados de uma investigação laboratorial que visa analisar os ganhos de resistência e rigidez de um solo arenoso, através da precipitação de carbonato de cálcio (CaCO3) por via enzimática, com base na adição de uma solução estabilizadora composta por água, ureia, cloreto de cálcio e a enzima urease. Inicialmente a eficiência da metodologia é analisada em tubos de ensaio com a determinação da massa de CaCO3 precipitada, sendo posteriormente testada em provetes de solo, com base em resultados de ensaios de compressão não confinada. São analisados os efeitos da concentração de enzima urease e do tempo de cura, no ganho de resistência e rigidez do solo estabilizado. Constata-se com o aumento da concentração de urease (até 4 kU/L) e do tempo de cura (até 7 dias) um significativo aumento de resistência e rigidez do solo. Ensaios de raios-X e imagens de microscópio eletrónico confirmam a precipitação de CaCO3.SYNOPSIS -This paper presents the results of a laboratory investigation with the aim of analysing the effect of enzymatically-induced calcium carbonate precipitation (CaCO3) on the strength and stiffness of a sandy soil. The stabilizer solution is composed of: water, urea, calcium chloride and the urease enzyme. Initially, this process is studied in test-tube experiments by the evaluation of the amount of CaCO3 precipitated. After this, the methodology is applied to stabilizing a soil based on the results of unconfined compressive strength tests. The effects of the amount of the urease enzyme and curing time used on the strength and stiffness of the stabilised soil are studied. An increase in the strength and stiffness of the stabilised soil is observed with the increase in the concentration of urease (less than 4 kU/L) and in the curing time (less than 7 days). X-ray power diffraction and scanning electron microscopy tests confirm the CaCO3 precipitation.Palavras Chave -Bioestabilização; biocimentação; precipitação de carbonato de cálcio; enzima urease.

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Application of Enzyme-Induced Carbonate Precipitation (EICP) to Improve the Shear Strength of Different Type of Soils

Chandra

Ravi

2020

Lecture Notes in Civil Engineering

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Effect of Soil Type on the Enzymatic Calcium Carbonate Precipitation Process Used for Soil Improvement

Cited by 85 publications

References 22 publications

Sand and silty-sand soil stabilization using bacterial enzyme–induced calcite precipitation (BEICP)

Sand and silty-sand soil stabilization using bacterial enzyme–induced calcite precipitation (BEICP)

Biocimentação de um solo arenoso com recurso a enzimas: efeito de diversos fatores

Application of Enzyme-Induced Carbonate Precipitation (EICP) to Improve the Shear Strength of Different Type of Soils

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