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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 274 for “"Fly ash"”.
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An experimental study of fly ash
Thesis (B.S.)--Michigan State College of Agriculture and Applied Science, 1946
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Extruded Cellular Fly Ash Construction Materials
Bulk densities and crushing strengths of honeycomb samples consolidated by sintering and by autoclaving were studied as a function of their respective compositions and processing conditions. Typical bulk densities, crushing strengths, and SDR obtained were 1.13 g/cm$\sp3,$ 97 MPa (14,100 psi), and …
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The effect of fly ash on clay
… studies to determine the effect of mixing fly ash with regional swelling of clayey soils indicated these mixtures were superior in certain engineering properties. Mixtures of clay soil, and fly ash at 10, 20, 30, and 40 percent exhibited reduced plasticity and swelling characteristics while …
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Evaluating shrinkage of fly ash - slag geopolymers
… on a user-friendly geopolymer made with Class F fly ash, slag, potassium silicate, and potassium hydroxide. Slag used was constant at 5% of the total mass of the mix. The SiO2 to Al2O3 ratio was kept constant at 3.6, the K2O to SiO2 ratio varied between 0.9 - 2.4 for molarity variations between 4 …
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Hydration and air entrainment of fly ash concrete
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2024-12-01
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Setting and nanostructure of slag-fly ash binders
Slag fly ash binders (SFB) are room temperature hardening binders that have high strength, reasonable setting time, and lower carbon footprint when compared to ordinary Portland cement (OPC). The precursors for SFB are industrial byproducts, namely slag and fly ash. The inexpensive nature of the …
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Electrofluidized beds in the control of fly ash
Thesis. 1978. Ph.D.--Massachusetts Institute of Technology. Dept. of Electrical Engineering and Computer Science.
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Geoenvironmental aspects of coal refuse-fly ash blends
The separate land disposal of coal refuse and fly ash presents difficulties throughout the Appalachian region, both in terms of disposal costs per acre and in terms of its potential environmental impacts on soil, ground water, revegetation, and slope stability. The purpose of this study was to …
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Optimizing the usage of fly ash in concrete mixes
… the recycling of waste by-products such as fly ash (FA), on a larger scale in the cement and concrete industry, by utilizing the FA to the optimum. In this study concrete mixes of 25 MPa, 35 MPa and 50 MPa with FA partially substituting the cement at 30%, 40%, 50% and 60% were produced and …
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Shear Strength Parameters of Sand Fly Ash Cement Mixtures
According to a 2012 American Coal Ash Association Coal production Survey Report, US coal fired power plants produced more than 109 million tons of waste that year. Approximately half of this waste is the valuable by-product fly ash. There are three classes of fly ash: cementitious class C and …
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Fly Ash Zeolite Catalyst Support for Fischer-Tropsch Synthesis
This dissertation research aimed at evaluating a fly ash zeolite (FAZ) catalyst support for use in heterogeneous catalytic processes. Gas phase Fischer-Tropsch Synthesis (FTS) over a fixed-bed of the prepared catalyst/FAZ support was identified as an appropriate process for evaluation, by …
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Use of Lignite Fly Ash as a Soil Amendment
… in potted mixtures of two Texas lignite fly ashes and a Troup sand, Sacul sandy loam, and a sandy clay loam strip-mine spoil. Mixtures contained 0, 25, 50, 75 and 100 percent fly ash. After six months, soil fly ash mixtures were analyzed for N, P, Ca, Mg, K, Na, Mn, Zn, pH, …
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Mechanical characteristics of organically modified fly ash-kaolinite mixtures
<p>"Fly ash is a hazardous waste material to the environment. Beneficial reuse of fly ash, however, brings economic and environmental benefits, i.e., decreases the cost of disposal, reduces greenhouse gas emission, and improves mechanical properties of construction materials. Due to the lack of …
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Drying shrinkage of self-compacting concrete incorporating fly ash
… Portland cement was replaced with 0-60% of fly ash (FA), fine and coarse aggregates were kept constant at 890 kg/m3 and 780 kg/m3, respectively. Two different water binder ratios of 0.44 and 0.33 were examined for both SCCs and NCs. Fresh properties of SCCs such as filling ability, passing …
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Fatigue and fracture of cement mortars containing fly ash
… was two-fold; to investigate the effects of fly ash on the fatigue resistance of cement mortars when included as a partial cement replacement, and to seek to improve the understanding of cyclic fatigue crack growth mechanisms in cementitious materials. Mortar mixes were prepared with similar …
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The Neutralisation of acid mine drainage by fly ash
… for power generation. Approximately 22 Mt of ash was produced in 1999 by ESKOM, the largest producer of electricity in South Africa. Of this only 1.1 Mt was utilised, the rest being disposed of in landfills or ash dams. Various environmental impacts are associated with the disposal of fly ash …
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Microbiology of fly ash-acid mine drainage co-disposal processes
… acid mine drainage formed during coal mining and fly ash from coal burning power generation, pose substantial environmental and economic problems for South Africa. Eskom has developed a remediation system employing alkaline fly ash to neutralize and precipitate heavy metals from toxic acidic acid …
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Creep and fracture of self-consolidating concrete incorporating fly ash
… Mexico aggregate sources and varying amounts of fly ash ranging from 20-40% by weight of Portland cement. Two NVC mixes using the same local aggregate were produced for comparison. Creep of SCC was measured experimentally and compared to commonly used code prediction models including AC1 209R-92 …
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Flow Behavior of Granular Soil and Impounded Fly Ash Slurries
… an embankment dam around mine tailings and coal ash slurry impoundments typically results in a fast-moving flow of toxic waste that can carry for several miles with disastrous consequence. The most recent catastrophic tailing-dam failure took place on 25 January 2019, at Brumadinho, Brazil, where …
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