Role of Gypsum in the Strength Development of Fly Ashes with Lime

Sivapullaiah, P. V.; Moghal, Arif Ali Baig

doi:10.1061/(asce)mt.1943-5533.0000158

Cited by 75 publications

(15 citation statements)

References 31 publications

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“…9 for the reference mix cured with burlap method of curing. It is evident from these figures that predicted values of slake durability indices I(d) 1 and I(d) 2 is less than the slake durability indices I(d) 1 and I(d) 2 obtained in the current study. This under estimation of the slake durability indices I(d) 1 and I(d) 2 using [16] empirical model is attributed to the difference in curing procedure adopted and materials used.…”

Section: Slake Durabilitycontrasting

confidence: 85%

“…Addition of lime to the low lime flyash results marginal increase in dry unit weight and optimum moisture content [1]. Addition of gypsum in fly ash mix decreases the dry unit weight of the mix as compared to that without gypsum [2] whereas the optimum moisture content varied from 31.5 to 35.4% and maximum dry unit weight varied from 10.25 to 10.82 kN/m 3 [3].…”

Section: Introductionmentioning

confidence: 92%

“…Slake durability test on the fly ash, lime and gypsum mixes in order to assess the resistance offered by a fly ash mix to weakening and disintegration when subjected to two standard cycles of drying and cooling on specimen cured for 28 and 56 days reported that slake durability index for fly ash mix without gypsum varied from 96% to 97% during the 1st cycle for 28 days cured specimen and increased marginally for 56 days cured specimen [2]. Wetting and drying test on fly ash-lime-gypsum mixes reported no significant reduction in the strength of the fly ash-lime-gypsum mixes even after 20 cycles of wetting and drying [1]. Addition of phosphogypsum in fly ash-lime mixes improves the durability characteristics [26].…”

Section: Introductionmentioning

confidence: 99%

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Suitability of Flyash-Lime-Phosphogypsum Composite in Road Pavements

Dutta

Kumar²

2016

Period. Polytech. Civil Eng.

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Section: Slake Durabilitycontrasting

confidence: 85%

Section: Introductionmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

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Suitability of Flyash-Lime-Phosphogypsum Composite in Road Pavements

Dutta

Kumar²

2016

Period. Polytech. Civil Eng.

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“…6 mm or 12 mm) of fiber. This is attributed to the transformation of amorphous pozzolanic compounds to crystalline form, which endure relatively lower strain levels even at higher peak stress levels as seen from Fig's 2 and 3 (Sivapullaiah andMoghal 2011, Moghal et al 2014). Relatively higher secant moduli are noticed for FC fibers compared to FM type.…”

Section: Effect Of Curing Periodmentioning

confidence: 97%

Target Reliability Approach to Study the Effect of Fiber Reinforcement on UCS Behavior of Lime Treated Semiarid Soil

Moghal

Chittoori

Basha

et al. 2017

J. Mater. Civ. Eng.

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This paper evaluates the effectiveness of stabilizing expansive soil with two different types of fibers, Fiber Mesh® (FM) and Fiber Cast® (FC), in conjunction with chemical stabilization. The intention of this study is to evaluate the effect of these fibers and lime in stabilizing expansive soil by improving its UCS behavior. The effect of varying lengths (6 mm and 12 mm) and amounts (0.2, 0.4 and 0.6% dosage by weight of soil) of FC and FM fibers and curing periods (0, 7, 28, 60, 120, 180 and 360 days) on the UCS and on secant modulus of a semi-arid expansive soil, in the presence of lime, was investigated. The main focus of this paper is on the determination of optimum fiber reinforcement parameters (in terms of fiber type, length and dosage) for the stabilization of expansive soil in terms of UCS, which is of a prime importance in soil stabilization projects for practicing engineers. In deterministic optimization, the uncertainties associated with subgrade soil of the pavement system are not explicitly taken into account. Hence, resulting optimal solutions may lead to reduced reliability levels of the pavement. Therefore, this paper also focuses on determining the optimum amounts of reinforcement for desired UCS performance of lime blended expansive soil using target reliability approach (TRA). The experimental data was used to develop a parabolic model using factors such as, length and dosage of fiber types to predict UCS as a response variable. In addition, it was concluded that the TRA can be successfully employed in expansive soil stabilization applications in determining the optimum length and dosage of fiber reinforcements.

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“…Yeheyis et al [12] investigated the utilization of coal fly ash and fly ash-bentonite mixtures as a barrier material for mine waste containment and concluded that addition of 10 % bentonite reduces the hydraulic conductivity of the coal fly ash to less than 10 -9 m/s and improves the chemical compatibility for mine waste containment. Sivapullaiah and Moghal [13] investigated the influence of gypsum on the fly ash and observed that with the addition of gypsum the hydraulic conductivity of the lime treated fly ash reduces.…”

Section: Introductionmentioning

confidence: 99%

On the Utilization of Fly Ash and Cement Mixtures as a Landfill Liner Material

Mishra

Ravindra

2015

Int. J. of Geosynth. and Ground Eng.

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Cement was added to class F type of fly ash in the proportion of 0, 2, 5 and 10 % to study for its suitability as a landfill liner material. Mixtures were compacted to their optimum moisture content (OMC) and maximum dry density (MDD). The results from the consolidation tests showed a relatively lower value of compression index for all the mixtures indicating the settlement due to application of overburden pressure would be small. Hydraulic conductivity of the samples were found to be decreased with the increasing the load. However, none of the mixtures exhibited a hydraulic conductivity value less than 10 -9 m/s, a limiting criterion set by various environmental agencies for the material to be used as a landfill liner. However, mixtures of 90 % fly ash ? 10 % cement compacted at 5 % wet of OMC-MDD exhibited a hydraulic conductivity value less than 10 -9 m/s. On drying, all the mixtures shrunk marginally. The unconsolidated undrained test results indicated that the shear strength parameters increase with increase in the cement content in the mixtures.

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Role of Gypsum in the Strength Development of Fly Ashes with Lime

Cited by 75 publications

References 31 publications

Suitability of Flyash-Lime-Phosphogypsum Composite in Road Pavements

Suitability of Flyash-Lime-Phosphogypsum Composite in Road Pavements

Target Reliability Approach to Study the Effect of Fiber Reinforcement on UCS Behavior of Lime Treated Semiarid Soil

On the Utilization of Fly Ash and Cement Mixtures as a Landfill Liner Material

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