Collapse Behavior of Coal Ash

Trivedi, Ashutosh; Sud, V. K.

doi:10.1061/(asce)1090-0241(2004)130:4(403)

Cited by 30 publications

(14 citation statements)

References 11 publications

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“…Leonards and Bailey (1982) report, on the basis of oedometric tests of fly ash compacted at optimum water content, a collapse behaviour of the fly ash structure after being fed a sample of water. This has also been described by Zawisza (1990) and Trivedi and Sud (2004). Zawisza determined that the settlement of the fly ash subsoil at the model station, loaded with s v = 49 kPa, after soaking accounted for about 20-40% of total settlement.…”

Section: Introductionsupporting

confidence: 64%

One-dimensional compression and swelling of compacted fly ash

Zabielska-Adamska

2018

Geotechnical Research

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The aim of the paper is to prove that the compressibility and swelling of compacted fly ash in both unsaturated and fully saturated conditions are dependent on the moisture content at the compaction and on the compaction energy, as in the case of cohesive soils. The studies have been conducted on samples compacted at various water contents in conventional oedometers and the Rowe hydraulic consolidation cell and in California bearing ratio moulds (swelling tests). The one-dimensional compressibility of saturated fly ash is much higher than that of unsaturated fly ash. Deformation of unsaturated samples increases with moisture at compaction, and the samples compacted with greater effort are less compressible. The consolidation of the saturated samples decreases with their moisture content at compaction and at the reduction of the compaction energy. The swelling of ash samples decreases as the moisture during compaction increases and when compaction energy is lower. The highest swelling was obtained for the fly ash with the highest optimum water content.

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Section: Introductionsupporting

confidence: 64%

One-dimensional compression and swelling of compacted fly ash

Zabielska-Adamska

2018

Geotechnical Research

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“…Table 3 presents the single oedometer collapse test results obtained at vertical stresses of 50, 100 and 200 kPa for the fly ash specimens compacted to different dry unit weights at a water content of 15 %. The lower limiting values for the degree of severity for collapsible soils and coal ashes are considered as 2 and 0.75 %, respectively [31,32]. The collapse potentials (vertical stress = 100 kPa) of the fly ash specimens compacted to a dry unit weight of 10.1 kN/m 3 at water contents of 10 and 15 % are in the range of 11.6-13 % which are categorized to have severe collapsibility [31,32].…”

Section: Resultsmentioning

confidence: 99%

“…The severity of collapse was classified by Jennings and Knight [30] for soils and Luteneggar and Saber [31] modified this classification for soils. Trivedi and Sud [32] developed the classification of collapse for coal ashes. Table 1 compares the classification of severity of collapse for soils and coal ashes.…”

Section: Introductionmentioning

confidence: 99%

“…In compacted coal ashes, the rainwater infiltration is sufficient to lower the matric suction which triggers failure. Sudden failure in fly ash disposal dumps and associated mudflows have been reported, and such failures are triggered due to poor compaction control of coal ashes in the field [7,32,33]. Fourie et al [34] highlighted the importance of instability of an ash slope induced due to the infiltration.…”

Section: Introductionmentioning

confidence: 99%

“…Fourie et al [34] highlighted the importance of instability of an ash slope induced due to the infiltration. Even though many studies have focused to understand the behaviour of coal ashes as a potential back fill material and foundation subgrade [9,17,32], the present experimental study focuses on the potential use of locally available Ramagundam coal ashes as a back fill material, highlighting the significance of various factors which influence the wetting-induced collapse. Therefore, this paper discusses the influence of dry unit weight, water content, vertical stress and concentration of sodium chloride and lime solutions on the collapse behaviour of compacted coal ashes.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Collapse Behaviour of Compacted Coal Ashes

Thyagaraj

Bhavani

Das

et al. 2016

Int. J. of Geosynth. and Ground Eng.

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Coal ash is a by-product produced from the thermal power plants. It is characterized with low unit weight, high shear strength and low compressibility and finds a major application as an alternate material in the geotechnical engineering applications. However, some coal ash fills are susceptible to wetting-induced collapse due to the loss of capillary suction which stabilizes the intergranular bonds. The present study examines the influence of placement conditions, vertical stress and pore fluid concentration on the collapse behaviour of compacted fly ash specimens. The experimental results showed that the maximum collapse potential for the coal ash specimens compacted to relative compaction of 80 % and water content of 15 % was in the range of 8.6-13 % at vertical stress of 100 kPa, which indicates that the apparent preconsolidation stress for the coal ash specimens is equal to 100 kPa. Among the coal ashes, the compacted fly ash specimens are more susceptible to wetting-induced collapse in comparison to bottom ash and pond ash specimens which is attributed to the higher silt size fraction in the fly ash. This study also presents the collapse behaviour of lime stabilized compacted coal ash.

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Engineering Behavior of Ash Fills

Trivedi¹

2013

Advanced Carbon Materials and Technology

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Collapse Behavior of Coal Ash

Cited by 30 publications

References 11 publications

One-dimensional compression and swelling of compacted fly ash

One-dimensional compression and swelling of compacted fly ash

Collapse Behaviour of Compacted Coal Ashes

Engineering Behavior of Ash Fills

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