Influence of chemical composition of fly-ash cenospheres on their grains size

Strzałkowska, E.; Adamczyk, Zdzisław

doi:10.1007/s13762-019-02512-2

Cited by 12 publications

(6 citation statements)

References 18 publications

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“…The authors reported [16][17][18][19][20] that the average grain size of microspheres usually ranges from 5 to 500 µm and the average thickness varies from 2 to 30 µm. As suggested Strzałkowska [21] and Danish [22], the size of the particles depends on their chemical composition. For example, an increase in the SiO 2 content in the chemical composition leads to a decrease in the diameter of microspheres.…”

Section: Introductionmentioning

confidence: 83%

Effect of Particle Size of Fly Ash Microspheres (FAMs) on the Selected Properties of Concrete

Haustein

Kuryłowicz-Cudowska

2022

Minerals

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This paper presents the investigations of selected properties of concrete containing two fractions of fly ash microspheres (FAMs) with grain size up to 200 µm and up to 500 µm. Concrete mixtures with ordinary Portland cement and three substitution rates of cement by FAMs, 1.3%, 2.0%, and 2.6%, were investigated. For all concrete mixes, the constant water–binder ratio (w/b) equal to 0.50 was used. The research program included the determination of chemical composition, particle size distribution, and pozzolanic activity of FAMs. The analysis showed that the microspheres consist of three main elements: silicon, aluminum, and iron, whose oxides constitute about 89% of the material. The total content of air pores, measured in concrete at 28 days, ranges from 1.3 to 3.1% for the grain sizes below 200 µm and from 1.4% to 3.9% for the grain sizes up to 500 µm. The FAMs with a particle diameter < 200 µm have a relatively high level of activity pozzolanic at 28 days. The SEM analysis proved that the use of microspheres reduces gaps and increases the CSH phase. The compression test showed that the addition of fly ash microspheres with grain size below 200 µm increases long-term concrete strength.

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Section: Introductionmentioning

confidence: 83%

Effect of Particle Size of Fly Ash Microspheres (FAMs) on the Selected Properties of Concrete

Haustein

Kuryłowicz-Cudowska

2022

Minerals

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“…Cenospheres are exclusively found in the Ferrosialic and Sialic groups, with the development of internal gas occurring when the molten ash droplet contains at least 5% iron oxide [44]. However, studies by Goodarzi et al [44] have shown that many cenosphere specimens contain even less iron oxide, contradicting the conclusion that iron is always necessary for cenosphere development [45][46][47][48][49]. Ferrocalsialic cenospheres exhibit magnetic properties, while Sialic cenospheres do not [50].…”

Section: Cenosphere Characterizationmentioning

confidence: 99%

Experimental Study on the Mechanical Properties and Microstructures of Cenosphere Concrete

et al. 2023

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The most valuable components of coal fly ash are cenospheres. Cenospheres are hollow spherical particles produced during the coal-burning processes. As a result of their excellent characteristics, such as high workability, high heat resistance, low bulk density, and high strength, cenospheres can be used in the manufacturing of lightweight cement concrete. The research efforts and outcomes are to produce long-lasting cement-based lightweight concrete (LWC) composites with good mechanical properties. The novelty of this investigation is to determine the cement concrete strength when silica fume (SF) and cenospheres (CS) were used as a replacement for cement. Throughout the experiments, a consistent substitution of 12% silica fume was incorporated into cement mass. Silica is used as a micro filler and pozzolanic reactant to strengthen concrete. The concrete mixtures were tested to ensure they met the requirements of the lightweight concrete in terms of their mechanical, physical, and durability qualities. According to the findings, lightweight concrete standards were met, and environmental sustainability was improved with the use of these mix proportions. Concrete specimen’s self-weight decreases by 35% with 30% cenosphere as a replacement. The micrograph shows the lack of portlandite is filled by mullite and other alumino silicates from the cenosphere. In order to achieve sustainability in concrete manufacturing, these mixtures can be suggested for the making of structural LWC that makes use of a large volume of industrial waste while conserving cement and natural resources.

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“…CS is a ceramic hollow structure particle formed by pulverized coal combustion at 1,000–1,800°C in thermal power plants to generate electricity (Yadav et al , 2021). The size of the CS ranges from 5 to 500 microns (Strzałkowska and Adamczyk, 2020), and their Wt.% is about 1%–2% in coal fly (Zyrkowski et al , 2016). A spherical wall-shaped CS is mullite-rich (Yadav et al , 2020), a chemically inert particle with several trapped gases.…”

Section: Introductionmentioning

confidence: 99%

Dry sliding wear behavior of additively manufactured cenosphere-filled PETG syntactic foam composites

Kumar

Negi

2023

AEAT

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Purpose This study aims to deal with developing composite filaments and investigating the tribological behavior of additively manufactured syntactic foam composites. The primary objective is to examine the suitability of the cenosphere (CS; 0–30 Wt.%) to develop a high-quality lightweight composite structure with improved abrasion strength. Design/methodology/approach CS/polyethylene terephthalate glycol (PETG) composite feedstock filaments under optimized extrusion conditions were developed, and a fused filament fabrication process was used to prepare CS-filled PETG composite structures under optimal printing conditions. Significant parameters such as CS (0–30 Wt.%), sliding speed (200–800 rpm) and typical load (10–40 N) were used to minimize the dry sliding wear rate and coefficient of friction for developed composites. Findings The friction coefficient and specific wear rate (SWR) are most affected by the CS weight percentage and applied load, respectively. However, nozzle temperature has the least effect on the friction coefficient and SWR. A mathematical model predicts the composite material’s SWR and coefficient of friction with 87.5% and 95.2% accuracy, respectively. Practical implications Because of their tailorable physical and mechanical properties, CS/PETG lightweight composite structures can be used in low-density and damage-tolerance applications. Social implications CS, an industrial waste material, is used to develop lightweight syntactic foam composites for advanced engineering applications. Originality/value CS-reinforced PETG composite filaments were developed to fabricate ultra-light composite structures through a 3D printing routine.

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Influence of chemical composition of fly-ash cenospheres on their grains size

Cited by 12 publications

References 18 publications

Effect of Particle Size of Fly Ash Microspheres (FAMs) on the Selected Properties of Concrete

Effect of Particle Size of Fly Ash Microspheres (FAMs) on the Selected Properties of Concrete

Experimental Study on the Mechanical Properties and Microstructures of Cenosphere Concrete

Dry sliding wear behavior of additively manufactured cenosphere-filled PETG syntactic foam composites

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