The Mechanical Activation of Fly Ash

Hela, Rudolf; Orsáková, Denisa

doi:10.1016/j.proeng.2013.09.016

Cited by 53 publications

(32 citation statements)

References 21 publications

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“…Morphology of fly ash grains changes, its spherical particles of different sizes are broken during the grinding process and they become smaller and irregular [71]. Different kinds of milling equipments (ball mills) may be used for this purpose [69,70,72]. Effectiveness of mechanical activation depends on conditions of milling process; however, chemical composition of activated material is also essential.…”

Section: Mechanical Activationmentioning

confidence: 99%

“…in studies described in [19]. However, it should be emphasised in this place that fine fraction of fly ash may be obtained not only during mechanical activation, but also as a result of classification during which more reactive, fine fraction rich in glassy components is separated [69,72,74]. In general, the smaller the particle size, the higher the hydration activity of fly ash is [57,75].…”

Section: Mechanical Activationmentioning

confidence: 99%

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Influence of selected activating methods on hydration processes of mixtures containing high and very high amount of fly ash

Wilińska

Pacewska

2018

J Therm Anal Calorim

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Binders containing fly ash as cement substitute have been used for many years. Typical amount of fly ash in cement composite does not exceed 35% of mass of binder. Replacement of substantial amount of cement mass by fly ash results in retardation of hydration of binder and deterioration of some concrete properties, e.g. delay in setting time and reduction in early compressive strength. These inconveniences may be reduced using proper method of activation. In this paper, possibilities to activate binding mixtures containing high and very high amount of fly ash and low amount of Portland cement were discussed basing on the literature reports as well as on our own research results. Several activating methods were described, such as mechanical activation, exchanging of part of components of binder (cement, fly ash or both of them) by more reactive fine-grained material, chemical activation by the use of alkaline activators as well as combined methods. Possibilities of using these methods were discussed in relation to amount of fly ash introduced as replacement of cement and kind of fly ash used. Usefulness of calorimetry and thermal analysis methods was also presented.

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Section: Mechanical Activationmentioning

confidence: 99%

Section: Mechanical Activationmentioning

confidence: 99%

Influence of selected activating methods on hydration processes of mixtures containing high and very high amount of fly ash

Wilińska

Pacewska

2018

J Therm Anal Calorim

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“…Therefore it is more advisable to use blended cements, which contain less Portland clinker and more additions based on fly ash. This is the effect of blending cement, which is proved in researches of Nasser and Marzouk and Collepardi [18, [19] and other researchers [20], [21], [22] showing lower production of calcium monoxide as a result of dehydration in the heat of fire, if fly ash and blast furnace slag were used. However, Nasser and Marzouk [18] also point out that these materials are not primarily used in practice for increasing resistance of concrete to high temperatures.…”

Section: Selection Of Cementmentioning

confidence: 85%

Behaviour of cement composites with lightweight and heavyweight aggregates at high temperatures

Bodnárová

Hroudová

Brožovský

et al. 2016

Period. Polytech. Civil Eng.

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“…On the other hand, besides grinding, reactivity of the solids can be tailored by further mechanical methods such as classification [7,8] by air classifiers or separation by physical properties using various separators (magnetic, electrostatic etc.) The drawback of these technologies is that only a certain part of the total mass is utilized and the rest is landfilled.…”

Section: Mechanical Activationmentioning

confidence: 99%

Mechanical activation of power station fl y ash by grinding – A review

Mucsi¹

2016

Epitoanyag - JSBCM

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Power station fly ash has good application possibilities mainly in the construction industry, nevertheless, significant amount is landfilled due to their relatively low reactivity and heterogeneity. Hydraulic properties of fly ashes can be tailored by mechanical activation achieving a higher added value product, for example supplementary cementing materials (scms). the improved properties are higher specific surface area and desired particle size distribution (containing submicron size particles) as well as higher amount of reactive components that can be optimized by grinding. the objective of this paper is to investigate the effect of mechanical activation of fly ash by grinding on physico-chemical and minerological properties. it can be established that there are numerous techniques for mechanical activation of fly ash, e.g. planetary ball mill, vibratory mill or stirred media mill. on the other hand, most of the results reported in the literature are focusing on material related investigations, but beside this, from energetic point of view the process related evaluation has even higher importance. keywords: mechanical activation, grinding, power station fly ash, reactivity, energy efficiency.Gábor Mucsi Associate Professor and Deputy Dean at the university of miskolc, Faculty of earth science and engineering, institute of raw material Preparation and environmental Processing. His main fields in education and research are mechanical processes -comminution, especially fine grinding, mechanical activation -and utilization of industrial by-products and waste materials. He has more than 100 publications.

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The Mechanical Activation of Fly Ash

Cited by 53 publications

References 21 publications

Influence of selected activating methods on hydration processes of mixtures containing high and very high amount of fly ash

Influence of selected activating methods on hydration processes of mixtures containing high and very high amount of fly ash

Behaviour of cement composites with lightweight and heavyweight aggregates at high temperatures

Mechanical activation of power station fl y ash by grinding – A review

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