The sequel of modified fly ashes using high energy ball milling on mechanical performance of substituted past cement

Hamzaoui, Rabah; Bouchenafa, Othmane; Guessasma, Sofiane; Leklou, Nordine; Bouaziz, Ahmed

doi:10.1016/j.matdes.2015.10.109

Cited by 60 publications

(23 citation statements)

References 33 publications

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“…Their X-ray diffraction (XRD) analysis pointed out the large and sharp diffuse band of calcium silicate hydrate (C\ \S\ \H) with curing time and the vanishing trend of Ca(OH) 2 after 180 days. We believe that, in our case, the boarding and slight shift of portlandite peaks can be attributed to the reduction of crystallite size and inter-reticular distance of portlandite, respectively [36]. Fig.…”

Section: Structural and Thermal Behavior Of Slag Cement Pastementioning

confidence: 51%

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Efficiency of high energy over conventional milling of granulated blast furnace slag powder to improve mechanical performance of slag cement paste

Bouaziz

Hamzaoui²,

Guessasma

et al. 2017

Powder Technology

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This work aims at bridging the efficiency of ball milling of granulated blast furnace slag (GBFS) to the structural and mechanical properties of slag cement pastes. Both conventional and high energy milling of GBFS are considered with a milling duration varied between 1 and 10 h. X-ray diffraction, infra-red spectroscopy, granulometry analysis and scanning electron microscopy are used to draw the main lines of structural and Morphological changes occurring during milling. Cement pastes formulated using 45% of GBFS in substitution are Characterized. Workability, X-ray diffraction analysis, differential scanning calorimetry and compressive testing ate performed to analyse main structural changes and reactions driven by the presence of milled GBFS as well as its direct consequence on the mechanical strength of slag cement pastes. Slag milling indicates the superior efficiency of high-energy milling, which allows a maximum slag finesse of 1.79 m(2)/g after 3 h of milling. Major structural changes occur during the first 3 h of high energy milling while conventional milling does not induce any remarkable trend. These changes concern amorphisation of the bulk structure in addition to the fracturing and agglomeration of slag particles. Workability of slag cement pastes is remarkably improved when using 1 h of high-energy slag milling. This result is consistent with slag finesse trend with respect to milling time and with the improvement of GBFS reactivity. The substitution of 45% of cement (CEM I 52.5) by GBFS is only beneficial at the condition of performing high-energy milling for at least 1 h

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Section: Structural and Thermal Behavior Of Slag Cement Pastementioning

confidence: 51%

“…The crystallite size D is calculated using the XRD profile analysis determined by Williamson-Hall method [35]. More details concerning calculation method are available in [36]. IR spectroscopy is performed at room temperature using Thermo Scientific Nicolet IS10 instrument equipped with Smart iTR (with Diamond Plate) accessory.…”

Section: Methodsmentioning

confidence: 99%

Efficiency of high energy over conventional milling of granulated blast furnace slag powder to improve mechanical performance of slag cement paste

Bouaziz

Hamzaoui²,

Guessasma

et al. 2017

Powder Technology

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“…The decrease in intensity is presumably due to partial amorphisation of phases, a typical effect induced by ball milling [12,26], and the extent of amorphisation kept enhancing with the increase of milling time. It is known that high energy ball mill can cause the transformation of crystalline material into amorphous state, increasing the amorphous content and enhancing its activity [14][15][16][17].…”

Section: Characteristics Of Milled and Washed Fly Ash-heavy Metals Lementioning

confidence: 99%

Suppressing Heavy Metal Leaching through Ball Milling of Fly Ash

Chen¹,

Lu²,

Mao³

et al. 2016

Energies

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Ball milling is investigated as a method of reducing the leaching concentration (often termed stablilization) of heavy metals in municipal solid waste incineration (MSWI) fly ash. Three heavy metals (Cu, Cr, Pb) loose much of their solubility in leachate by treating fly ash in a planetary ball mill, in which collisions between balls and fly ash drive various physical processes, as well as chemical reactions. The efficiency of stabilization is evaluated by analysing heavy metals in the leachable fraction from treated fly ash. Ball milling reduces the leaching concentration of Cu, Cr, and Pb, and water washing effectively promotes stabilization efficiency by removing soluble salts. Size distribution and morphology of particles were analysed by laser particle diameter analysis and scanning electron microscopy. X-ray diffraction analysis reveals significant reduction of the crystallinity of fly ash by milling. Fly ash particles can be activated through this ball milling, leading to a significant decrease in particle size, a rise in its BET-surface, and turning basic crystals therein into amorphous structures. The dissolution rate of acid buffering materials present in activated particles is enhanced, resulting in a rising pH value of the leachate, reducing the leaching out of some heavy metals.

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“…When mixed with Portland cement and water, fly ash induces a reaction with the calcium hydroxide released by the hydration of Portland cement to produce calcium-silicate hydrates (CSH) [9][10][11][12][13]. However, there are few limitations of the use of fly ash in cement because of the late pozzolanic reaction that starts only after 7 to 28 days [14][15][16]. Therefore, several authors have conducted studies on how to activate fly ash trough milling [5,17,18].…”

Section: Introductionmentioning

confidence: 99%

Effect of mechanical activation of fly ash added to Moroccan Portland cement

et al. 2018

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Nowadays, the cement industry is the largest emitter of CO2. In 2015, cement production accounts for roughly 8% of global CO2 emissions. In order to reduce this impact, cement plants are working on alternative solutions, for instance, producing cement by adding additives like fly ash known for reducing the emissions of CO2 and minimizing production costs. The thermal power stations in Morocco produce more than 500 000 tons per year. For ecological and sustainable development reasons, it is desirable to recycle these quantities according to beneficial methods to their addition in the cement. This study aims to investigate the influence of grinding fly ash on the physico-chemical and mechanical properties of fly ash blended CPJ45 cement. The addition of the fly ash particles to the grinder leads respectively to the breakage of the particles and to reduce the agglomeration effect in the balls of cement grinder. Fly ash milling was found to improve particles fineness, and increase the silica and alumina content in the cement. Furthermore, milled fly ash blended cements show higher compressive strength compared to unmilled fly ash blended cements, due to improved fly ash reactivity through their mechanical activation.

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The sequel of modified fly ashes using high energy ball milling on mechanical performance of substituted past cement

Cited by 60 publications

References 33 publications

Efficiency of high energy over conventional milling of granulated blast furnace slag powder to improve mechanical performance of slag cement paste

Efficiency of high energy over conventional milling of granulated blast furnace slag powder to improve mechanical performance of slag cement paste

Suppressing Heavy Metal Leaching through Ball Milling of Fly Ash

Effect of mechanical activation of fly ash added to Moroccan Portland cement

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