2010
DOI: 10.1061/(asce)ee.1943-7870.0000211
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Feasibility of Using Coal Fly Ash for Mine Waste Containment

Abstract: This study investigates the feasibility of using coal fly ash and fly ash-bentonite mixtures as a barrier material for mine waste. The hydraulic conductivity of the coal fly ash was measured to be in the order of 2 x 10-9 m/s when it was permeated with deionized water, and this value decreased significantly when the permeant was switched to acid mine drainage (AMD). Addition of bentonite to coal fly ash lowered the hydraulic conductivity during water permeation but no further significant change was observed up… Show more

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Cited by 29 publications
(18 citation statements)
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“…Soil is the usual majority component of the soil mixture since the study followed the suggested mix [6] to reduce its cost, the soil excavated from the cut-off wall trench can be utilized as the soil element for the backfill. If the soil is contaminated or does not meet the requirements, the excavated soil can be removed and treated.…”
Section: Permeabilitymentioning
confidence: 99%
See 1 more Smart Citation
“…Soil is the usual majority component of the soil mixture since the study followed the suggested mix [6] to reduce its cost, the soil excavated from the cut-off wall trench can be utilized as the soil element for the backfill. If the soil is contaminated or does not meet the requirements, the excavated soil can be removed and treated.…”
Section: Permeabilitymentioning
confidence: 99%
“…It was proposed that fly ash is replacing bentonite since power plants discharge large amounts of fly ash as waste but only half of them are used and the remaining half is trashed to land and sea, its disposal became an environmental concern. The utilization of fly ash may be a viable alternative for barrier containment material [6] but on the contrary, fly ashes generally consist of siltsized particles and consequently possess high permeability [7]. Permeability refers to the susceptibility of a material to allow fluid to move through its pores.…”
Section: Introductionmentioning
confidence: 99%
“…Murat and Yilmaz [11] studied the behaviour of fly ash and bentonite mixture and concluded that fly ash mixed with 20 % bentonite can be used as a liner and cover material at the waste disposal site. 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%
“…There are also trace amounts of heavy metals, such as arsenic, barium, cadmium, chromium, copper, lead, mercury, molybdenum, nickel, selenium, strontium, vanadium, and zinc, which typically do not exceed 1% by weight [8]. Fly ash particles range in size from 0.5 (clay) to 100 µm (fine sand), with a specific gravity that ranges from 2.2 to 2.8 [2] [8].…”
Section: Introductionmentioning
confidence: 99%
“…The minor constituents present are magnesium oxide (MgO), sodium oxide (Na 2 O), titanium oxide (TiO 2 ), potassium oxide (K 2 O), phosphorus oxide (P 2 O 3 ), and sulfur trioxide (SO 3 ), the sum of which account for less than 5% of the total weight [6] [7]. There are also trace amounts of heavy metals, such as arsenic, barium, cadmium, chromium, copper, lead, mercury, molybdenum, nickel, selenium, strontium, vanadium, and zinc, which typically do not exceed 1% by weight [8]. Fly ash particles range in size from 0.5 (clay) to 100 µm (fine sand), with a specific gravity that ranges from 2.2 to 2.8 [2] [8].…”
Section: Introductionmentioning
confidence: 99%