Stabilizing Soft Fine-Grained Soils with Fly Ash

Edil, Tuncer B.; Acosta, Hector A.; Benson, Craig H.

doi:10.1061/(asce)0899-1561(2006)18:2(283)

Cited by 221 publications

(79 citation statements)

References 11 publications

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“…This led to reduction in UCS, thus conforming to the findings of [16]. Increase in strength (up to 8% PPKS) was probably due to the coupled effects of flocculation and agglomeration of PPKS together with the neo-formations such as calcium silicate hydrates (CSH) and calcium aluminate hydrates (CAH) that coat and bind the soil particles to produce strong matrices [17]. …”

Section: Unconfined Compressive Strength (Ucs)supporting

confidence: 61%

Structural Evaluation of the Effect of Pulverized Palm Kernel Shell (PPKS) on Cement-Modified Lateritic Soil Sample

Olutaiwo¹,

Segun²,

Ariyo³

2017

AJCE

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Abstract:There have been global efforts to reduce environmental pollution of agricultural and industrial waste products by utilizing such wastes as stabilizing agents to improve soils for various uses, especially road construction. In this research, lateritic soil sample obtained from a borrow pit was tested with varying percentages of Pulverized Palm Kernel Shell (PPKS). The soil was classified as A-6 (AASHTO classification) using standard soil laboratory tests. Laboratory tests such as Atterberg Limits, Compaction, Unconfined Compressive Strength (UCS) and California Bearing Ratio (CBR) were conducted on the soil + PPKS mix only and also on soil + PPKS + 3% Ordinary Portland Cement (OPC) mix. The liquid limit (LL) and plasticity index (PI) values decreased steadily with increase in PPKS while the plastic limit (PL) value increased with up to 4% PPKS addition after which the values started decreasing. The shrinkage limit (SL) value increased with a peak value at 8% PPKS addition after which the values began to decrease. The Optimum Moisture Content (OMC) results on PPKS addition increased from 16% to 19.5% while the Maximum Dry Density (MDD) decreased by 45.18% from 1.669g/m 3 to 0.915g/m 3 . Addition of PPKS decreased the Unsoaked CBR by 10.79% from 68.60 to 61.20% while the Soaked CBR increased by 74.12% from 18.05% to 69.75%. UCS values for the lateritic soil and PPKS for the uncured sample, at 7 days and 14 days had peak values of 85.03, 96.46 and 100.44 respectively. From the study, it can be concluded that the properties of the Lateritic soil improved when stabilized with Cement and pulverized palm kernel shell compared to when it was stabilized with pulverized palm kernel shell alone.

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Section: Unconfined Compressive Strength (Ucs)supporting

confidence: 61%

Structural Evaluation of the Effect of Pulverized Palm Kernel Shell (PPKS) on Cement-Modified Lateritic Soil Sample

Olutaiwo¹,

Segun²,

Ariyo³

2017

AJCE

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“…Fly ash has been widely used in brick and rammed earth studies (Kayali, 2005;Brooks, 2009;Cristelo et al, 2012). The usages of fly ash as additive have also been examined by Zia and Fox (2000) and Edil et al (2006). Kolay and Pui (2010) examined the potential usage of gypsum and fly ash in stabilization of peat soil.…”

Section: Introductionmentioning

confidence: 99%

“…Nevertheless, the cost will higher as the peat layers get deeper and economically limited to shallow zone. Stabilization technique of chemical admixture can be performed through mixing of additives to allow flocculation (aggregation) and to form chemical bonding between particles (Edil et al, 2006;Huat et al, 2005). Increase in effective size in clay aggregation and inter-particle bonding contribute to the stability and strength of the treated soil.…”

Section: Introductionmentioning

confidence: 99%

Application of Gypsum and Fly Ash as Additives in Stabilization of Tropical Peat Soil

Rahman¹,

Lee²,

Rahim³

et al. 2015

J. of Applied Sciences

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A B S T R A C TThe demand for land in conjunction to infrastructure development is become crucial and expensive. In the near future, a problematic soil such as peat is becoming a final alternative. In crucial cases, peat land cannot be avoided and has been hosted for engineering structures (e.g., road, highway, railway and bridge). Peat soil is well established of its downgraded characteristics, highly compressibility and low in shear strength. This study aimed to investigate effect of fly ash and gypsum on the mechanical properties of peat soil. Fly Ash (FA) is a by-product material that is generated from the burning of coal in thermal power plants. In this study, gypsum was prepared chemically in the laboratory to simulate residue from Neutralization Underflow Process (NUF). For the first batch of samples, the peat samples were initially treated with Synthetic Gypsum (SG) in the ranges between 0 and 20% of sample dried weight (SG treated soil). In a second batch, the peat samples were prepared with 10% FA and then mixed thoroughly with different amounts of SG contents (0, 5, 10 and 20%) (10FA-SG treated soil). The results showed that soil treated with mixture of 10% FA and SG indicated lower liquid limit values than the SG treated soil. In compaction tests, the maximum dry density of both increased in both SG treated soil and FA-SG treated soil. The permeability of SG treated soil increased with the increases in SG contents. Similarly, occurred to permeability of FA-SG treated soil however, its values are lower than the soil treated without FA. Shear strength of SG treated showed decreased with increasing amount of SG content. In contrast, the FA-SG treated soil exhibited higher strength if compared to that of SG treated soil. The result suggested that the application of FA and SG mixture is more effective in stabilization in mechanical strength and densification of peat soil than the use of SG only.

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“…Following compaction or placement of fly ash-amended tailings in the PVC molds, the entire mold and specimen was wrapped and sealed in polyethylene bags to prevent desiccation and allowed to cure for 7 or 28 d prior to hydraulic conductivity testing. Curing was completed in a room with 100% relative humidity and temperature of 21 C in accordance with prior research (Mohamed et al 2002;Edil et al 2006;Senol et al 2006;Godbout et al 2007;Soleimanbeigi et al 2013). …”

Section: Hydraulic Conductivity Experimentsmentioning

confidence: 99%

Hydraulic Conductivity of Fly Ash-Amended Mine Tailings

Alhomair

2016

Geotech Geol Eng

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HYDRAULIC CONDUCTIVITY OF FLY ASH-AMENDED MINE TAILINGSThe objective of this study was to evaluate the effect of fly ash addition on hydraulic conductivity (k) of mine tailings. Fly ash-amended mine tailings have potential application as construction materials in active mines, transportation earthworks, and other geotechnical engineering projects. Addition of cementitious binder (fly ash) to mine tailings has the potential to reduce hydraulic conductivity and enhance contaminant sequestration to be feasible in earthwork projects. Mine tailings used in this study were categorized as synthetic tailings and natural tailings. Natural tailings were collected from a garnet mine located in the U.S. Two synthetic mine tailings were developed via blending commercially-available soils to create typical particle-size distributions and plasticity characteristics of actual mine tailings. The two types of fly ash used classified as off-specification, but had sufficient calcium oxide (CaO) content (17% and 18.9%) for pozzolanic activity.

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Stabilizing Soft Fine-Grained Soils with Fly Ash

Cited by 221 publications

References 11 publications

Structural Evaluation of the Effect of Pulverized Palm Kernel Shell (PPKS) on Cement-Modified Lateritic Soil Sample

Structural Evaluation of the Effect of Pulverized Palm Kernel Shell (PPKS) on Cement-Modified Lateritic Soil Sample

Application of Gypsum and Fly Ash as Additives in Stabilization of Tropical Peat Soil

Hydraulic Conductivity of Fly Ash-Amended Mine Tailings

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