Effect of fly ash on geotechnical properties and stability of coal mine overburden dump: an overview

Rajak, Tarun Kumar; Yadu, Laxmikant; Chouksey, Sandeep Kumar

doi:10.1007/s42452-020-2803-3

Cited by 10 publications

(5 citation statements)

References 60 publications

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“…GGBS contains silica, lime, alumina, and magnesia whose percentage may vary depending upon the raw materials, limestone flux, and type of producing iron. The use of GGBS for soil stabilization has also been documented in the literature, and it has been shown to reduce expansiveness, enhance density, and improve the characteristics of expansive soils [7,[11][12][13][14]. Sharma & Sivapullaiah, [15] illustrated that addition of GGBS and fly ash in soil stabilization can be more advantageous than utilized alone.…”

Section: Introductionmentioning

confidence: 99%

Effect of GGBS on Strength Characteristics and Stability of Pond Ash Mixed Soil Embankment

Rajak¹,

Mishra²,

Yadu

2022

IOP Conf. Ser.: Earth Environ. Sci.

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The increased usage of coal by thermal power plants results in enormous volumes of pond ash. Ground Granulated Blast Furnace Slag (GGBS) is produced in huge quantity in iron industries and is mostly utilised in the cement industry. Despite the fact that these industrial by-products have a wide range of applications, it is still conceivable to investigate the alternate mode for batch usage. The present study explores the effectiveness of GGBS in modifying the strength characteristics of a soil-pond ash mix. Pond ash was mixed with soil at 10%, 15%, 20%, and 25%, and strength behaviour were determined by analysing compaction characteristics, Unconfined Compressive Strength (UCS), bearing ratio behaviour, and shear strength parameters. The effect of GGBS addition in various amounts on the strength properties of pond ash-soil mix was also observed at various curing periods. Stability analysis was also conducted using limit equilibrium based GEOSLOPE software to evaluate the Factor of Safety (F) and stability of stabilized soil embankment. It was found from the test results that the addition of GGBS to the pond ash-soil mix improved the strength behaviours. With the inclusion of GGBS, the curing period was extended, which resulted in a substantial improvement in strength properties. Substantial improvement in factor of safety and stability of embankment was also observed by adding GGBS in pond ash-soil mix. Outcome of present study demonstrates an alternative approach for effective and safe utilization of GGBS and pond ash at optimum proportions.

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Section: Introductionmentioning

confidence: 99%

Effect of GGBS on Strength Characteristics and Stability of Pond Ash Mixed Soil Embankment

Rajak¹,

Mishra²,

Yadu

2022

IOP Conf. Ser.: Earth Environ. Sci.

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“…In the second approach, the soil would be stabilized using chemical additives to improve the loadbearing capacity [1]. For soil stabilization, several types of additives including lime, cement, enzymes, lignin, fly ash, resins, and other chemicals can be used [2][3][4]. The selection of the proper stabilization agent depends on factors such as cost, soil type, and the desired performance [5].…”

Section: Introductionmentioning

confidence: 99%

“…The meticulous selection of fly ash, considering its class and lime content, is imperative for construction applications seeking improved cementitious properties that are vital for optimal performance and longevity in flexible pavements. Class C fly ash boasts a lime content surpassing 20%, demonstrating a distinctive self-cementitious behavior when exposed to moisture [4]. This inherent property makes Class C fly ash particularly desirable for soil stabilization applications in pavement construction.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Subgrade Stabilization Life-Extending Benefits in Flexible Pavements Using a Non-Linear Mechanistic-Empirical Analysis

Ghanizadeh,

Salehi,

Mamou

et al. 2024

Infrastructures

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This paper investigates the effect of subgrade soil stabilization on the performance and life extension of flexible pavements. Several variables affecting soil stabilization were considered, including subgrade soil type (CL or CH), additive type and content (3, 6, and 9% of hydrated lime, 5, 10, and 15% of class C fly ash (CFA), and 5, 10, and 15% of cement kiln dust (CKD)), three stabilization thicknesses (15, 30, and 45 cm), and four pavement sections with varying thicknesses. The effects of these variables were investigated using four different damage mechanisms, including the fatigue life of the asphalt concrete (AC) and stabilized subgrade layers, the crushing life of the stabilized subgrade soil, and the rutting life of the pavement, using a non-linear mechanistic-empirical methodology. The results suggest that the optimum percentage that maximizes the pavement life occurs at 3% of lime for subgrade soil type CL, 6% of lime for subgrade type CH, and 15% of CFA and CKD for both subgrade soil types. The maximum pavement life increase occurred in the section with the lowest thickness and the highest stabilization thickness, which was 1890% for 3% of lime in the CL subgrade and 568% for 6% of lime in the CH subgrade. The maximum increase in the pavement life of subgrade stabilization with 15% of CFA was 2048% in a CL subgrade, and 397% in a CH subgrade, and life extension due to subgrade stabilization with 15% of CKD was 2323% in a CL subgrade and 797% in a CH subgrade.

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“…Around 70-75% of the electricity is generated by coal-based thermal power plants in India. Indian coal is of poor quality and contains almost 30-45% of ash [1,2]. Fly ash is also considered a hazardous water pollutant due to the presence of toxic heavy metals [3].…”

Section: Introductionmentioning

confidence: 99%

“…Fly ash is not suitable for use in seepage barriers such as liners. To lower the permeability of fly ash, clay-like admixtures should be used [2,18]. The utilization of a large quantity of fly ash means proper mixing of the fly ash with other materials may not be significantly achieved.…”

Section: Introductionmentioning

confidence: 99%

Geotechnical Behaviour of Fly Ash–Bentonite Used in Layers

et al. 2022

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Increasing infrastructure growth has forced the construction industry to look for wasteful, cheap, and suitable materials for construction. An investigation into the geotechnical utilization of fly ash was carried out in the present study. Practical applications normally involve the use of large quantities of fly ash, so proper mixing of the fly ash with other materials may not be significantly achieved. Therefore, the present paper investigates the behaviour of a fly ash–bentonite layered system with different ratios. The physical properties and chemical composition of fly ash and bentonite were determined. SEM and energy dispersive X-ray experiments were also used to investigate the morphology and phase compositions of fly ash and bentonite. A series of consolidated undrained (CU) triaxial tests on fly ash–bentonite were carried out to investigate shear strength characteristics. Fly ash (F) and bentonite (B) were used in the following ratios: 1:1 (50% F:50% B), 2:1 (67% F:33% B), 3:1 (75% F:25% B), and 4:1 (80% F:20% B), with different numbers of interfaces (N), i.e., 1, 2, and 3 for each ratio. The deviator stress and cohesion value were found to increase with the number of interfaces for each ratio. The angle of shear resistance changed marginally with the increase in the fly ash–bentonite ratios and varying interfaces.

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Effect of fly ash on geotechnical properties and stability of coal mine overburden dump: an overview

Cited by 10 publications

References 60 publications

Effect of GGBS on Strength Characteristics and Stability of Pond Ash Mixed Soil Embankment

Effect of GGBS on Strength Characteristics and Stability of Pond Ash Mixed Soil Embankment

Investigation of Subgrade Stabilization Life-Extending Benefits in Flexible Pavements Using a Non-Linear Mechanistic-Empirical Analysis

Geotechnical Behaviour of Fly Ash–Bentonite Used in Layers

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