Ultrafine grinding of fly ash with grinding aids: Impact on particle characteristics of ultrafine fly ash and properties of blended cement containing ultrafine fly ash

Zhao, Jihui; Wang, Dongmin; Wang, Xueguang; Liao, Shucong; Lin, Hui

doi:10.1016/j.conbuildmat.2015.01.025

Cited by 98 publications

(30 citation statements)

References 48 publications

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“…It was observed that the original CBA had grey color and due to the grinding process, it changed from grey to dark grey in color and the specific gravity also varies. In this study, CBA of three different fineness properties were used, because particle fineness has an important role in the development of pozzolanic reaction [11]. In addition to particle size analysis, manual sieving was also performed through a 63 micron sieve to get the different particle fineness of the ground CBA.…”

Section: Physical Properties Of Cbamentioning

confidence: 99%

“…But they did not consider the different fineness (different grinding periods). Moreso, it was previously suggested by Zhao, et al [11], Jaya, et al [12] and Mangi, et al [13] that the addition of fine ground supplementary cementing materials (SCMs) could enhance the strength of concrete. It was previously stated that SCMs-made from natural or waste materials-has been given serious attention to the development of composite cement for ecological, economic, and multi-quality reasons [14].…”

Section: Introductionmentioning

confidence: 99%

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Recycling of Coal Ash in Concrete as a Partial Cementitious Resource

et al. 2019

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Concrete construction offers a great opportunity to replace the cement with a coal-based power plant waste—known as coal bottom ash (CBA)—which offers great environmental and technical benefits. These are significant in sustainable concrete construction. This study aims to recycle CBA in concrete and evaluate its particle fineness influence on workability, compressive and tensile strength of concrete. In this study, a total of 120 specimens were prepared, in which ground CBA with a different fineness was used as a partial cement replacement of 0% to 30% the weight of cement. It was noticed that workability was decreased due to an increased amount of ground CBA, because it absorbed more water in the concrete mix. The growth in the compressive and tensile strength of concrete with ground CBA was not significant at the early ages. At 28 days, a targeted compressive strength of 35 MPa was achieved with the 10% ground CBA. However, it required a longer time to achieve a 44.5 MPa strength of control mix. This shows that the pozzolanic reaction was not initiated up to 28 days. It was experimentally explored that 10% ground CBA—having particle fineness around 65% to 75% and passed through 63 µm sieve—could achieve the adequate compressive and tensile strength of concrete. This study confirmed that the particle fineness of cement replacement materials has a significant influence on strength performance of concrete.

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Section: Physical Properties Of Cbamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Recycling of Coal Ash in Concrete as a Partial Cementitious Resource

et al. 2019

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“…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]. Thus, grinding process aimed in obtainment of fly ash of even more fragmentation is also desirable.…”

Section: Mechanical Activationmentioning

confidence: 99%

“…Thus, grinding process aimed in obtainment of fly ash of even more fragmentation is also desirable. Ultrafine fly ash exhibiting an average particle size of less than 10 lm may be produced during highenergy mechanical milling with the use of grinding aids to improve grinding efficiency [75,76].…”

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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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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“…8 total area at lowest possible magnification of 75 X was covered to carry out EDX analyses in order to determine chemical composition of eleven elements present in fine and coarse product specimens obtained at 8000, 10000 rpm classifiers wheel speeds as shown in Table 2. It can be seen here that in all the samples of separated fly ashes, Al and Si together account for more than 80% of the particles of fly ash, in which silica is more than 50%, which makes them glassy in nature [9][10][11]. Further it can be seen that fine products have slightly more amount of Si in them as compared to coarse products and as the classifier's wheel speed is increased the percentage of Si increases.…”

Section: Chemical Propertiesmentioning

confidence: 64%

Dry separation of brown coal fly ash, determination of its physical, morphological, chemical, and mechanical properties of its cementitious mixes

Haider

Bittnar²,

Ali³

et al. 2017

Period. Polytech. Civil Eng.

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The dry separation of brown coal fly ash was carried out in this research using ultrafine air classifier. Classifiers wheel speed was increased from 2000 to 10000 rpm to obtain fine and coarse products. As the speed of classifier was increased diameter of particles decreased and particle morphology was observed on optical, electron microscopes which showed that at 10000 rpm classifiers wheel speed, average fine particles morphology changed from angular and rounded irregular slaggy particles to spherical particles. High volume cementitious mixes were prepared with fine and coarse products in which cement -60% fine products samples showed a considerable increase of compressive strength as compared to cementitious raw fly ash control samples.

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Ultrafine grinding of fly ash with grinding aids: Impact on particle characteristics of ultrafine fly ash and properties of blended cement containing ultrafine fly ash

Cited by 98 publications

References 48 publications

Recycling of Coal Ash in Concrete as a Partial Cementitious Resource

Recycling of Coal Ash in Concrete as a Partial Cementitious Resource

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

Dry separation of brown coal fly ash, determination of its physical, morphological, chemical, and mechanical properties of its cementitious mixes

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