Time Effect on Shear Strength and Permeability of Fly Ash

Porbaha, Ali; Pradhan, Tej B.S.; Yamane, Nobuyuki

doi:10.1061/(asce)0733-9402(2000)126:1(15)

Cited by 34 publications

(7 citation statements)

References 16 publications

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“…Ghosh and Subbarao [ 84 ] observed a similar trend in the stabilization of a low lime fly ash with lime and gypsum. Osinubi [ 85 ] and Deb and Pal [ 86 ] observed a similar trend in fly ash for direct falling head permeability; Porbaha et al [ 87 ] also observed a similar trend in indirect calculation from consolidation. Show et al [ 88 ] observed an increasing trend in compacted fly and bottom ash mixture with a higher percentage of fly ash.…”

Section: Resultsmentioning

confidence: 61%

Compaction Characteristics and Permeability of Expansive Shale Stabilized with Locally Produced Waste Materials

et al. 2022

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Waste is available in an abundant form and goes to landfill without any use, creating threats to the environment. Recent and past studies have used different types of waste to stabilize soil and reduce environmental impacts. However, there is a lack of studies on the combined use of marble dust, rice-husk ash, and saw dust in expansive shale soil. The current study tries to overcome such a gap in the literature, studying the effect of marble dust, rice-husk ash, and saw dust on expansive shale’s compaction characteristics and permeability properties. According to unified soil classification and the AAHTO classification system, the geotechnical properties of natural soil are classified as clay of high plasticity (CH) and A-7-5. Several tests are performed in the laboratory to investigate the compaction characteristics and permeability properties of expansive shale. Moreover, permeability apparatus is used to investigate the permeability properties of soil. In addition, due to the accuracy of the apparatus, the conventional apparatus has been partly modified. The experimental results show that the addition of waste to the soil has significantly improved soil stabilization, increasing permeability and decreasing plasticity indexes. In addition, there is a gradual decrease in the dry density of soil and an increase in the permeability of stabilized soil. Based on the outcomes of the current study, it claims and concludes that these waste materials can be used as soil stabilizers or modifiers, instead of being dumped in landfill, which will provide a green, friendly, and sustainable environment. The current study recommends that future researchers use various wastes in the concrete and soil to improve their compaction and mechanical properties.

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Section: Resultsmentioning

confidence: 61%

Compaction Characteristics and Permeability of Expansive Shale Stabilized with Locally Produced Waste Materials

et al. 2022

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“…It was caused by the fact, that fly ash and fly-ash bentonite mixtures had lower values of initial void ratios e 0from about 0.47 to 0.38. In other studies (Porbaha et al, 2000), where e 0 was equal to 1.02 and 0.85 for fly ash without additives, the C c values were 0.078 and 0.036, respectively.…”

Section: Resultsmentioning

confidence: 78%

“…The primary consolidation of fly ash does not take longer than one minute (Porbaha et al, 2000), which suggests its similarity to non-plastic silts or granular soils. No additional settlement was observed over time as the hardening process took place.…”

Section: Compressibility Of Fly Ash and Fly Ash-bentonite Mixturesmentioning

confidence: 98%

Compressibility of Fly Ash and Fly Ash-Bentonite Mixtures

Wasil

2022

BJRBE

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Environmental protection, one of the most important issues nowadays, forces civil engineers to look for alternative solutions to the known ones. The use of substitute materials as an embankment fill or a ground material under the embankment instead of natural soil follows these trends. A great amount of fly ash is disposed of in landfills. It is a cost-effective material that can be used in construction instead of natural soil. The geotechnical properties of fly ash as a construction material in place of soil need to be examined. It includes laboratory tests to determine the chemical composition and geotechnical characteristics. In the present work, one-dimensional consolidation tests have been conducted to examine the compressibility behaviour of compacted fly ash and fly ash-bentonite mixtures used in the earth structures like road embankments. The analysis of the consolidation phenomenon is useful for predicting the magnitude and rate of settlement of the structure. Materials compacted at OMC to their MDD, according to Standard Proctor, were tested in Rowe-Barden type consolidometer on saturated and non-saturated samples. Coefficients of consolidation have been compared between values derived from log-time and square-root-of-time methods and direct hydraulic conductivity tests. Bentonite amount in fly ash-bentonite mixtures influences the vertical deformation of the sample.

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“…Usually, settlements in compacted fly ash are very fast under the application of load [8]. Porbaha et al [9] found that as the time elapses, hardening process continues because of pozzolanic reaction and prohibits any additional settlement. A study by Kaniraj and Gayathri [10] revealed that the coefficient of consolidation of the fly ash samples is similar to those of non-plastic silts.…”

Section: Introductionmentioning

confidence: 99%

Studies on the Compressibility and Shear Strength Behaviour of Fly Ash and Slag Mixtures

Sharma

Sivapullaiah

2021

Int. J. of Geosynth. and Ground Eng.

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This paper investigates on the mechanical characteristics (compressibility and shear strength) of fly ash/ground-granulated blast-furnace slag (GGBS) mixtures at various mix ratios using consolidation and direct shear tests, respectively. The consolidation studies were done at a reduced duration of load increment. The compressibility behaviour has been found to improve with increase in GGBS content. Direct shear test results showed an increase in angle of internal friction with GGBS content. Microstructural studies using SEM reveal insight information about the effect of particle morphology responsible on compressibility and shear strength behaviour. It is proposed from the findings of this investigation that fly ash/GGBS mixtures have utilisation potential in the construction of embankments or structural fill which will undergo very small settlement.

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Time Effect on Shear Strength and Permeability of Fly Ash

Cited by 34 publications

References 16 publications

Compaction Characteristics and Permeability of Expansive Shale Stabilized with Locally Produced Waste Materials

Compaction Characteristics and Permeability of Expansive Shale Stabilized with Locally Produced Waste Materials

Compressibility of Fly Ash and Fly Ash-Bentonite Mixtures

Studies on the Compressibility and Shear Strength Behaviour of Fly Ash and Slag Mixtures

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