Effect of Fly Ash and Cement on the Engineering Characteristic of Stabilized Subgrade Soil: An Experimental Study

Rai, Partab; Qiu, Wenge; Pei, Huafu; Chen, Jihui; Ai, Xufeng; Liu, Yang; Ahmad, Musheer

doi:10.1155/2021/1368194

Cited by 29 publications

(10 citation statements)

References 28 publications

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“…Te desired strength of the soil is attained by varying the proportion of FA and PGSS. A reasonable proportion of additives were obtained by starting with 5% of FA and 2.5% of PGSS [45]. An appropriate proportion of additives were replaced for numerous tests.…”

Section: Methodsmentioning

confidence: 99%

Amelioration Effect of Fly Ash and Powdered Ground Steel Slag for Improving Expansive Subgrade Soil

Alemshet

Fayissa

Geremew

et al. 2023

Journal of Engineering

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The utilization of fly ash (FA) and powdered granulated steel slag (PGSS) as additives in soil stabilization plays a crucial role in environmental, economic, and weak soil property improving advantages. In this study, the combined effect of FA and PGSS in improving expansive subgrade soil was investigated. The materials used for this study were expansive soils, FA, and PGSS. The study has applied an experimental research method. For this investigation, the index properties, Free Swell Index (FSI), unconfined compressive strength (UCS), optimum moisture content (OMC), California bearing ratio (CBR), and scanning electron microscope (SEM) tests were done for treated and untreated expansive soils. The findings indicated that as the mixture of FA (0 to 12.5% at 5% increment) and PGSS (0 to 25% at 5% at 2.5% increment) is added to the untreated expansive soils, the index properties, FSI, and OMC of the soils were significantly declined. The CBR values of expansive soils containing 20% FA and 10% PGSS mixture were 13.8% and 16.21%, respectively, which improved the quality of the soils by 85.43% and 84.82%, respectively. While the untreated expansive soils have a UCS value of 0.34 kg/cm2, the treated soil comprising 20% FA and 10% PGSS mixture has a UCS value of 13.42 kg/cm2, indicating that the soil strength is enhanced by 97.47%. The results of the studies demonstrate that adding FA and PGSS to expansive soil improves its stability and strength. The study concluded that disposals such as FA and PGSS might be effectively used in enhancing the characteristics of construction materials and used for the construction.

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Section: Methodsmentioning

confidence: 99%

Amelioration Effect of Fly Ash and Powdered Ground Steel Slag for Improving Expansive Subgrade Soil

Alemshet

Fayissa

Geremew

et al. 2023

Journal of Engineering

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“…The characterization o tested fly ash, which includes mineralogical composition, morphological determina and chemical composition, revealed that fly ash is enriched in CaO (Table 4). Th creased specific surface of its particles makes fly ash capable of restraining elements participating in chemical reactions due to the microporous minerals included, suc clays and micas [26,27]. Furthermore, the SiO2 presence constitutes the main carri Table 5 presents the chemical composition of the investigated fly ash, and the XRD pattern of Figure 7 shows the mineralogical composition of fly ash.…”

Section: Raw Materialsmentioning

confidence: 99%

“…SiO 2 + Al 2 O 3 + Fe 2 O 3 content also has to be >50%, which is not the case in Greek fly ash due to its high CaO content. However, several authors [25,26] classify Greek fly ash in Class C, taking into consideration the significantly high CaO concentration. It should be mentioned that one major problem regarding fly ash use is the heterogeneity of its chemical composition derived from the chemical composition of feed lignite, the combustion conditions, and the amount of coexcavated inorganic strata that led to combustion.…”

Section: Raw Materialsmentioning

confidence: 99%

Evaluation of Cement Performance Using Industrial Byproducts Such as Nano MgO and Fly Ash from Greece

et al. 2021

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The need for environmentally friendly construction materials is growing more and more these days. This paper investigates byproducts from Greece, such as magnesite tailings from Evoia and fly ash from Kardia (Ptolemais), in order to evaluate their suitability as cement additives. For this purpose, the raw materials were tested and studied regarding their mineralogical and chemical components for their morphological characteristics. Different cement specimens of various mixtures of raw materials were produced and tested. These raw materials are considered suitable for cement additives. The effect of nano MgO content seems to have played a more critical role in the physicomechanical performance of produced cement compared to that of the fly ash content. Furthermore, more satisfactory results in the physicomechanical properties of the produced cement gave samples of group II containing 3–4% of nano MgO. Nano MgO content up to 4% seems to have negative influence on the compressive strength of the produced cement, simultaneously reducing its durability. The increase of nano MgO content leads to the increase of the expansion of the produced cement specimens. In the early stage, the expansion rate was intensively larger. With the consumption of nano MgO, the expansion in the later stage gradually slowed down and tended to stabilize.

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“…On the other hand, such additives contribute to the production costs, which may vary greatly depending on the availability and demand of the fibrous additives, their type (composition), source, and other economic factors. To make such construction materials feasible, fibrous additives may be joined with other independently devised solutions aiming at decreasing the energy intensity of the production processes (such as warm and half-warm techniques in asphalt mixtures [10]) and the utilization of alternative binders in hydraulically bound materials (e.g., based on fly ash [11]).…”

Section: Introductionmentioning

confidence: 99%

Performance of Fly-Ash- and Cement-Bound Granular Mixtures with Dispersed Fiber Reinforcement—A Case Study

Chomicz-Kowalska,

Maciejewski

2024

Applied Sciences

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This paper investigates the effects of incorporating dispersed fibrous reinforcement in hydraulically bound granular 0/16-mm mixtures. The evaluated fibrous reinforcement comprised a mixture of polypropylene and alkali-resistant glass fibers in a 1:2 weight ratio. The fibrous reinforcement was added to the mixtures in amounts of 0.05% and 0.10% by weight. The prepared mixtures utilized 1% of CEM II/B-V 32.5 R Portland cement together with 3.5%, 7%, and 14% of fly ash, characterized by a high content of reactive calcium oxide. It was found that the fibrous additives had only a small effect on the maximum dry densities and virtually none on the optimum moisture contents of the mixtures. The use of the fiber mix significantly improved the compressive strength of the reinforced samples resulting after 42 days of curing, with a performance comparable to a reference mixture bound with 8% of Portland cement. The addition of fibrous reinforcement increased the indirect tensile strength of the mixtures by up to 300%, resulting in a performance similar to that of a reference mixture with 5% of Portland cement. It was found that the use of this particular fibrous reinforcement significantly improved the performance of predominantly fly-ash-bound granular mixtures, allowing the reduction in cement content used in this type of material.

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Effect of Fly Ash and Cement on the Engineering Characteristic of Stabilized Subgrade Soil: An Experimental Study

Cited by 29 publications

References 28 publications

Amelioration Effect of Fly Ash and Powdered Ground Steel Slag for Improving Expansive Subgrade Soil

Amelioration Effect of Fly Ash and Powdered Ground Steel Slag for Improving Expansive Subgrade Soil

Evaluation of Cement Performance Using Industrial Byproducts Such as Nano MgO and Fly Ash from Greece

Performance of Fly-Ash- and Cement-Bound Granular Mixtures with Dispersed Fiber Reinforcement—A Case Study

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