Compacting characteristics of aluminium-fly ash powder mixtures

Guo, Rui‐Fen; Rohatgi, Pradeep K.; Nath, Deo

doi:10.1007/bf01159325

Cited by 50 publications

(37 citation statements)

References 4 publications

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“…For example, fly ash material has been studied for use as a filler or a reinforcement material in metal composites and as an insulating material. Guo et al (1996) investigated compaction characteristics of aluminum-fly ash powder mixtures, where he observed that hollow fly ash particles start collapsing at compaction pressures of the order of 345 MPa. Dry (1995) reported that the compressive strengths of hollow fly ash particles range from 5 MPa to 7 MPa.…”

Section: Shear Strengthmentioning

confidence: 99%

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Determination of Ash Mixture Properties and Construction of Test Embankment - Part A

Yoon¹,

Balunaini²,

Prezzi³

et al. 2006

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Prepared in cooperation with the Indiana Department of Transportation. AbstractClass F fly ash and bottom ash are solid residue byproducts produced by coal-burning plants. They are usually disposed off with a typical disposal rate of 80 % fly ash and 20 % bottom ash. To maximize the use of the coal ash, and thus significantly reduce the disposal problem that electric utility companies and our society in general face, the direct use of ponded or landfilled ash that is composed of high proportions of fly ash would be desirable. However, a general understanding of the behavior of high volume fly ash mixtures is needed. Although there have been investigations into the properties of separated single types of ash, the studies of the fly/bottom ash mixtures, especially with high fly ash contents, are very limited.Representative samples of class F fly ash and bottom ash were collected from two utility plants in Indiana and a series of extensive laboratory tests were conducted to obtain the mechanical properties of the mixture. Since the mechanical properties of ash mixtures are dependent on the mixture proportions, the investigations evaluate fly/bottom ash mixtures with different mixture ratios (with Fly ash contents of 50%, 75%, and 100%). The results obtained are merged with other considerations relevant to embankment design and construction and used to develop guidelines on coal ash utilization in highway embankments. In order to examine suitable fly/bottom ash mixture compositions and embankment geometries, slope stability analyses were performed on ash embankments with different geometries using the different properties of the ash mixtures with different mixture ratios. The limit equilibrium method was used for the stability analyses. Additionally, the corrosion potential to metal structures, which are commonly included in highway construction, is examined by performing corrosivity tests on the ash mixtures. Key WordsFly ash, bottom ash, disposal, mixtures, embankments, highway construction. Distribution StatementNo restrictions. This document is available to the public through the National Technical Information Service, Springfield, VA 22161 affect their specific gravity, particle strength, and consequently other mechanical properties to varying degrees. The impact of these morphological characteristics on mechanical properties tends to be constant for a given ash source, but vary between different ash sources.2) Fly/bottom ash mixtures (with mixture ratios ranging from 50% to 100% fly ash content) exhibit relatively well-defined moisture-density relationships, and the relationships vary with mixture ratios. As the fly ash content increases from 50% to 100% (i.e., as bottom ash content decreases from 50% to zero), w opt increases, and γ d,max decreases gradually. The values of γ d,max for compacted ash mixtures tend to vary greatly from plant to plant, due to a relatively wide range of specific gravity values from plant to plant. However, overall, the values of γ d,max of ash are lower than those of typi...

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Section: Shear Strengthmentioning

confidence: 99%

“…Guo et al (1996) examined the chemical compositions of hollow and solid fly ash particles separately, and the data revealed that hollow-particle fly ash had significantly lower iron content (4.5%) than solid-particle fly ash (25.1%).…”

Section: Specific Gravitymentioning

confidence: 99%

Determination of Ash Mixture Properties and Construction of Test Embankment - Part A

Yoon¹,

Balunaini²,

Prezzi³

et al. 2006

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show abstract

“…Hollow fly ash particles (cenospheres), especially those with cracks or openings, may be more crushable than solid fly ash particles. However, it is known that the compressive strength of cenospheres is typically high, around several megapascals (MPa) (Dry, 1995;Guo et al, 1996). Moreover, the particle size of fly ash is generally very small.…”

Section: Compressibility and Collapsibilitymentioning

confidence: 99%

Evaluation of the mechanical properties of class-F fly ash

Kim

Prezzi

2008

Waste Management

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“…The compression pressures defined in the literature [20][21][22]24] ranged between 138.0·10 6 To establish the degree of integrity for pellets, a punching procedure was applied.…”

Section: Pelletizingmentioning

confidence: 99%

“…better simulation of storage conditions in the bottom of containers (where oxidation degree should be the higher) some pressure was applied over the samples. The equivalent of a real aluminum powder tower (1.5 m in length and density = 776.1 kg/m 3 ) -at the bottom of the container-, was simulated applying 0.82 Kg f on a vessel with an inner diameter of 0.03 m (11 366.34 Pa).The experiments were carried out in beakers of 0.025 L, with 0.15 Kg of aluminum powder of known purity, soaked either in water alone or with inertizing substances (citric acid, sodium silicate, raw linseed oil, boiled linseed oil and PEG 6000)[20][21][22].A concentration of 0.5 wt % was chosen according to the results of previous experiments performed with the dynamic method.…”

mentioning

confidence: 99%