A comparison of the specific surface area of fly ash measured by image analysis with conventional methods

Wang, Tiao; Ishida, Tetsuya; Gu, Rui

doi:10.1016/j.conbuildmat.2018.09.131

Cited by 35 publications

(11 citation statements)

References 21 publications

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“…where m is the complex refractive index; n is the real component and k is the imaginary component [27]. The real component n was determined by the normalized mass fraction of Al2O3 and SiO2 of the specific fly ash ( Table 1).…”

Section: Test Methods For Ground Fly Ashmentioning

confidence: 99%

Mechanical Activation of Fly Ash: Physical, Mineralogical and Morphological Characterization of Ground Fly Ashes

Dikmen¹,

Dikmen²,

Yilmaz

et al. 2019

Eskişehir Technical University Journal of Science and Technology a - Applied Sciences and Engineering

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In this study, physical, mineralogical and morphological characteristics of mechanically treated fly ashes are investigated. The compositional analysis of the raw fly ash was determined using X-ray fluorescence (XRF) technique. The XRD patterns reveal that the main phase quartz along with mullite and anhydrite. The raw fly ash was also wet ground using a laboratory mill, for several different times (from 2 to 16 hours) in order to examine how the grinding increases the activity of the fly ash. The ground fly ash was characterized for (i) particle size distribution: laser diffraction method, (ii) specific surface area: BETmethod, (iii) crystalline structure: X-ray diffractometer, and (iv) morphology of particles: scanning electron microscope. According to physical characterization, fineness increasing of samples with grinding time was observed, but loss of effectiveness occurred for grinding time longer than 12 hours. In addition, the unmilled fly ash showed lower specific surface area, due to the presence of cenospheres in the original fly ash. Only a little change in crystalline structure of fly ashes was observed when grinding and there were changes in the area and height of each diffraction peak.

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Section: Test Methods For Ground Fly Ashmentioning

confidence: 99%

Mechanical Activation of Fly Ash: Physical, Mineralogical and Morphological Characterization of Ground Fly Ashes

Dikmen¹,

Dikmen²,

Yilmaz

et al. 2019

Eskişehir Technical University Journal of Science and Technology a - Applied Sciences and Engineering

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“…Meanwhile, the separation system of vertical mill guarantees the qualified particles from crushing, which protects more spherical particles from impact and destruction. The studies of Lanzerstorfer [ 30 ] and Itskos [ 47 ] indicated the shape transformation from round to angular in the grinding process, and classification contributes to the protection of fly ash particles.…”

Section: Spherical Destruction Analysis Of Fly Ashmentioning

confidence: 99%

“…The reaction degree of fly ash is according to the reaction between Ca(OH) 2 and the glassy particles in fly ash, while the outer layer of these particles are protected by a hard shell, which delay the pozzolanic reaction to a large extent [ 43 ]. However, the grinding process destroy the glassy particles, which provide much more surface defects and accelerate the pozzolanic reaction obviously [ 30 , 44 , 45 , 46 , 47 ]. From the SEM images and spherical destruction analysis of fly ash, most glassy particles in fly ash are spherical, and the quantity of spherical particles decreases after grinding process.…”

Section: Strength Of Cement Paste Containing Ground Fly Ashmentioning

confidence: 99%

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Influence of Particle Morphology of Ground Fly Ash on the Fluidity and Strength of Cement Paste

Wang

Zhao

et al. 2021

Materials

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The grinding process has become widely used to improve the fineness and performance of fly ash. However, most studies focus on the particle size distribution of ground fly ash, while the particle morphology is also an important factor to affect the performance of cement paste. This article aims at three different kinds of ground fly ash from the ball mill and vertical mill, and the particle morphology is observed by scanning electron microscopy (SEM) to calculate the spherical destruction (the ratio of spherical particles broken into irregular particles in the grinding process of fly ash), which provides a quantification of the morphology change in the grinding process. The fluidity of cement paste and the strength of cement mortar are tested to study the relation of spherical destruction and fluidity and strength. The results show that the spherical destruction of ground fly ash in a ball mill is more than 80% and that in a vertical mill with a separation system is only 11.9%. Spherical destruction shows a significant relation with the fluidity. To different addition of ground fly ash, the fluidity of cement paste decreases with the increase of spherical destruction. To the strength of cement paste, particle size distribution and spherical destruction are both the key factors. Therefore, spherical destruction is an important measurement index to evaluate the grinding effect of the fly ash mill.

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“…This outcome demonstrates that the elements are available as their oxides. Major types of fly ashes, i. e., bituminous, subbituminous, and lignite, containing heterogeneous materials of SiO2, Al2O3, and Fe 2 O 3, are the fundamental parts and along with CaO and other oxides [32–34] . EDAX of PANI demonstrates the presence of elements C, N, O, and S (Figure 4d).…”

Section: Formation Of Pani‐fa Hybridmentioning

confidence: 99%

Enhancing the Electrochemical Performance of Polyaniline Using Fly Ash of Coal Waste for Supercapacitor Application

et al. 2021

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Hybrid materials are essential materials for the future age elite electrochemical supercapacitors. A hybrid material or organic polymer‐inorganic metal oxide composite comprises of polyaniline (PANI) with fly ash (FA) is made by in‐situ polymerization of aniline monomer with fly ash, an inexhaustible asset. The impact of fly ash on polyaniline is resolved from electrical and electrochemical measurements. PANI‐FA is utilized in a supercapacitor cell as the electrode. FT‐IR, XRD, FE‐SEM, TGA and BET evaluate properties of this hybrid, and their electrochemical properties are assessed by CV, CD, and EIS measurements. PANI with 10 wt.% of FA (PANI‐FA01) indicates higher conductivity and supercapacitor execution than its individual material via metal oxide, acting as an intermediate for transferring ions from PANI and electrolyte. PANI‐FA01 demonstrates a higher capacitance estimation of 208 F g−1 contrasted with PANI (83 F g−1) at 2.5 A g−1. The hybrid electrode material shows better charge‐discharge cycles, holding over 66 % of its first cycle gravimetric capacitance after 5000 cycles with effective coulombic efficiency of 99–100 %, which is as yet 43 % higher than the specific capacity of PANI. The Bode plot shows a phase angle of 80°.

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A comparison of the specific surface area of fly ash measured by image analysis with conventional methods

Cited by 35 publications

References 21 publications

Mechanical Activation of Fly Ash: Physical, Mineralogical and Morphological Characterization of Ground Fly Ashes

Mechanical Activation of Fly Ash: Physical, Mineralogical and Morphological Characterization of Ground Fly Ashes

Influence of Particle Morphology of Ground Fly Ash on the Fluidity and Strength of Cement Paste

Enhancing the Electrochemical Performance of Polyaniline Using Fly Ash of Coal Waste for Supercapacitor Application

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