Effect of Bio-enzyme—Chemical Stabilizer Mixture on Improving the Subgrade Properties

Aswathy, C. M.; Raj, Athira S.; Sayida, M. K.

doi:10.1007/978-981-15-6237-2_63

Cited by 7 publications

(4 citation statements)

References 2 publications

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“…Laboratory and field studies were conducted on the stabilization of expansive clayey soils and artificial gravel using vinyl acetate homopolymer (VAH) and sodium silicate-based admixture (SSBA) with lime additives [10]. Other materials like Terra-zyme and fly ash have also been used to improve the subbase properties [11]. Kushwaha et al [12] reported an increase in the California bearing ratio (CBR) and unconfined compressive strength (UCS) values after stabilization with Zycocil.…”

Section: Introductionmentioning

confidence: 99%

Laboratory Investigation and Field Performance Evaluation of Chemically Stabilized Cement Treated Subbase

Hazim,

Chopra,

Pathak

et al. 2024

Period. Polytech. Civil Eng.

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There is a growing concern over the depletion of naturally occurring construction materials for lower unbound pavement layers. Stabilization of locally available materials has attracted considerable research interest. Nanotechnological additives have a good potential in stabilizing materials that are incompatible for pavement construction. The main aim of this research is to evaluate the use of nano-chemical additives on the laboratory and field characteristics of cement treated subbase (CTSB) mixes prepared with locally available soil. Locally available soil, cement, and nano-chemicals were utilized to assess their effect on California bearing ratio (CBR) and unconfined compressive strength (UCS) of chemically treated subbase mixes. The UCS of the soil-aggregate mix treated with cement improved by 103.4% on the addition of nano-chemical additives. The soaked CBR of the mix treated with the optimum dosage of cement and nano-chemical was increased by 219%. The laboratory-based evaluation was followed by construction of field sections utilizing the control subbase (soil-aggregate only), cement-treated subbase, and cement+nano-chemical treated subbase mixes. Deflectometric investigations were performed on the field sections using a light weight deflectometer. X-ray diffraction and scanning electron microscopy tests were carried out to study the microstructure of subbase mixes. Stabilisation using nano chemicals resulted in additional phases of ettringite that caused densification of matrix compared to pristine soil-aggregate mix. Pavement analysis and economic analysis of the different subbase mixes were also performed. The subbase prepared with 3% cement and 1.2 kg/m3 dosage of nano-chemical additive was found to be the optimum considering laboratory and field performance.

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Section: Introductionmentioning

confidence: 99%

Laboratory Investigation and Field Performance Evaluation of Chemically Stabilized Cement Treated Subbase

Hazim,

Chopra,

Pathak

et al. 2024

Period. Polytech. Civil Eng.

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“…The subgrade's soil stabilization improves the material's stability to resist deformation from repeated transverse loads [2][3][4]. Soil stabilization is a technique used to prevent problems like potholes, rutting, and muddiness on roadways [5][6][7]. Black cotton soil has a dual nature when exposed to moisture imbalance, and this can cause significant degradation of the pavement surface (bitumen/concrete), which can lead to costly maintenance and repairs [8,9].…”

Section: Introductionmentioning

confidence: 99%

Field Studies on Expansive Soil Stabilization with Nanomaterials and Lime for Flexible Pavement

Pokkunuri,

Sinha,

Verma

2023

Sustainability

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The long-term performance of pavement is greatly influenced by the subgrade soil-bearing capacity. The areas with lower bearing capability experience higher construction costs due to soil replacement. Soil stabilization is one of the engineering measures that may be used to improve soil properties. The improvement in the soil properties varies depending on the soil type and type and dosage of the stabilizer. The primary objective of this study is to determine the impact of the different types of stabilizers on different types of black cotton soil. In the present study, black cotton soil was treated with Terrasil (0.5, 0.75, and 1 kg/m3), Zycobond (0.5, 0.75, and 1 kg/m3), and lime (0, 2, and 3%). The influence of varying dosages of Terrasil, Zycobond, and lime showed a significant improvement in the FSI, CBR, and UCS. In this study, attempts were made to investigate the field performance of chemically treated black cotton soil. A 100 m trail section with chemical- and lime-treated subgrade was constructed and analyzed using the dynamic cone penetration test. Finally, the mechanical design indicated that the chemical stabilization layer could be helpful to reduce asphalt layer thickness by 30 mm and cost. It is anticipated that this study will be useful to perceive, visualize, and understand the advantages of chemically treated black cotton soil. Overall, it is a step toward sustainable construction, which will reduce the demand for natural materials by optimizing pavement design and the use of existing unsuitable materials (black cotton soil) in flexible pavement construction.

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“…In long-term operation, frozen soil highways often suffer from subsidence, cracking, and other diseases [15][16][17][18]. The existing studies mainly analyze the temperature field of each level of highway, failing to fully consider the water migration of the roadbed [19][20][21][22][23]. Komaravolu et al [24] created an accurate roadbed section model based on COMSOL, discussed the influence of width, slope, and height on roadbed temperature distribution under separate and integrated layouts, and concluded that the main influencing factors are slope and width under the two layouts.…”

Section: Introductionmentioning

confidence: 99%

“…Mastering the temperature field distribution of permafrost foundations is the basis for the infrastructure design and construction [20][21][22][23][24][25][26]. In view of the construction requirements on the runway width and height of the frozen soil airport, Ikeagwuani and Nwonu [27] carried out Abaqus finite-element analysis on the change law of roadbed temperature field for airport runway, under different width, runway types, local environments, and climates, and constructed a calculation model for airport runway roadbed with thermal insulation layer.…”

Section: Introductionmentioning

confidence: 99%

Temperature Field Distribution and Thermal Stability of Roadbed in Permafrost Regions

Yao¹,

Shi²,

Zu³

2021

IJHT

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Many highways and railways in western China are built on permafrost roadbed. Frost heave and thaw settlement might cause diseases to frozen soil roadbed, such as deformation and cracking. For long-term operation, frozen soil roadbed should be kept stable and durable. Therefore, this paper analyzes the distribution law of temperature field of roadbed in permafrost regions, under the effect of thermal stability. Based on the thermodynamic properties of permafrost, the authors analyzed the influence of engineering geological factors, roadbed structural factors, and natural environmental factors on the thermal stability of frozen soil roadbed. Next, the antifreeze mechanism of frozen soil roadbed was described, together with the calculation methods for the relevant parameters. Afterwards, the temperature field of the roadbed with low thermal conductivity insulation material was analyzed by two methods, namely, steady-state thermal analysis and transient thermal analysis, and the solving process of roadbed temperature field was explained in details. The proposed analysis method and solving algorithm were proved valid through experiments. The research results provide a reference for the reasonable design of frozen soil roadbed.

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Effect of Bio-enzyme—Chemical Stabilizer Mixture on Improving the Subgrade Properties

Cited by 7 publications

References 2 publications

Laboratory Investigation and Field Performance Evaluation of Chemically Stabilized Cement Treated Subbase

Laboratory Investigation and Field Performance Evaluation of Chemically Stabilized Cement Treated Subbase

Field Studies on Expansive Soil Stabilization with Nanomaterials and Lime for Flexible Pavement

Temperature Field Distribution and Thermal Stability of Roadbed in Permafrost Regions

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