Liners for waste containment constructed with class F and C fly ashes

Palmer, Byron A.

doi:10.1016/s0304-3894(00)00199-0

Cited by 53 publications

(20 citation statements)

References 8 publications

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“…The presence of reactive material can improve the efficiency of barriers by further dropping the hydraulic conductivity, inducing chemical conversion or retarding the movement of contaminants (Palmer et al, 2000;Karickhoff et al, 1979). Commercially available cross-linked insoluble sodium polyacrylates (a SAP) with a free swell capacity of 250 g/g in deionized water was used.…”

Section: Polymer Materials (Sodium Polyacrylates)mentioning

confidence: 99%

Potential use of densified polymer-pastefill mixture as waste containment barrier materials

2010

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Section: Polymer Materials (Sodium Polyacrylates)mentioning

confidence: 99%

Potential use of densified polymer-pastefill mixture as waste containment barrier materials

2010

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“…Moreover they observed a lower permeability when 1% (w/w) of gypsum was added. Palmer et al (2000) also showed that field applications of siliceous CFA were not satisfactory; due to the necessity to blend them with cementitious CFA to reach a hydraulic conductivity less than 10 -9 m s -1 . Prashanth et al (2001) studied the reuse of pozzolanic CFA as a substitute for clay liners.…”

Section: Geological Barriersmentioning

confidence: 99%

Fly ashes from coal and petroleum coke combustion: current and innovative potential applications

2009

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Coal fly ashes (CFA) are generated in large amounts worldwide. Current combustion technologies allow the burning of fuels with high sulfur content such as petroleum coke, generating non-CFA, such as petroleum coke fly ash (PCFA), mainly from fluidized bed combustion processes. The disposal of CFA and PCFA fly ashes can have severe impacts in the environment such as a potential groundwater contamination by the leaching of heavy metals and/or particulate matter emissions; making it necessary to treat or reuse them. At present CFA are utilized in several applications fields such as cement and concrete production, agriculture and soil stabilization. However, their reuse is restricted by the quality parameters of the end-product or requirements defined by the production process. Therefore, secondary material markets can use a limited amount of CFA, which implies the necessity of new markets for the unused CFA. Some potential future utilization options reviewed herein are zeolite synthesis and valuable metals extraction. In comparison to CFA, PCFA are characterized by a high Ca content, suggesting a possible use as neutralizers of acid wastewaters from mining operations, opening a new potential application area for PCFA that could solve contamination problems in emergent and mining countries such as Chile. However, this potential application may be limited by PCFA heavy metals leaching, mainly V and Ni, which are present in PCFA in high concentrations.

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“…Results of a series of tests on compacted fly ash added with rubber and bentonite samples by Cokca and Yilmaz [7] showed that the hydraulic conductivity of the sample decreases with the increase in the bentonite content and decrease in the rubber content in the mixtures. The study by Palmer et al [8] showed that a hydraulic conductivity value lower than 10 -9 m/s can be achieved by compacting class F and C type of fly ashes mixed with a coarse aggregate (e.g., bottom ash) above OMC. Investigation by Shackelford and Glade [6] on the mixtures of fly ash-sand-bentonite showed the hydraulic conductivity of the mixture decreases by the increasing the bentonite content up to 18 % in the mixture.…”

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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Liners for waste containment constructed with class F and C fly ashes

Cited by 53 publications

References 8 publications

Potential use of densified polymer-pastefill mixture as waste containment barrier materials

Potential use of densified polymer-pastefill mixture as waste containment barrier materials

Fly ashes from coal and petroleum coke combustion: current and innovative potential applications

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

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