Fly ash as a raw material for low-carbon cement clinkers and its radiological properties

Mirković, Miljana; Kljajević, Ljiljana; Nenadović, Snežana; Dolenec, Matej; Šter, Katarina; Žibret, Lea; Rajačić, Milica

doi:10.1007/s10967-021-07719-7

Cited by 4 publications

(8 citation statements)

References 37 publications

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“…Results of the mineralogical composition of synthesized samples are shown in Figure 1 . The identified mineral phases in geopolymer samples do not differ much from the phases identified in fly ash—FA01 which contains: hematite, quartz, plagioclase, mullite as main phases which are presented in our previous research [ 32 ]. As the results show, the synthesized geopolymer (GP, GP1, and GP2) materials reveal crystal diffraction peaks of mullite, quartz, and plagioclase (albite) as main mineral forms in the geopolymer matrix.…”

Section: Resultsmentioning

confidence: 64%

“…Radiological results of FA01 and its geopolymer products are shown in Table 2 . Results represented in Table 2 show that the higher values of specific activities and calculated parameters were obtained for FA01 raw material presented in our previous study [ 32 ]. In GP, GP1, and GP2, the most common index (I γ ) is reduced, and the H ex and H in .…”

Section: Resultsmentioning

confidence: 65%

“…The geopolymer materials are synthesized using FA01 fly ash, which was previously sieved to a grain size of 0.2 mm and then for the synthesis of each geopolymer sample, 25 g fly ash was weighed. Chemical composition of FA01 (19.76% Al 2 O 3 , 61.77% SiO 2 , 6.58% Fe 2 O 3 , 5.32% CaO, 2.06% MgO, 0.51% SO 3 , 0.32% Na 2 O, 1.27% K 2 O) is determined in our previous research [ 32 ] according to standard EN 450–1, while LOI-Loss of ignition at 950 °C is 2.06% determined in accordance to standard EN 196–2 [ 32 ]. In the obtained results the calculated ratio of SiO 2 /Al 2 O 3 is 3.13.…”

Section: Methodsmentioning

confidence: 99%

“…Besides radiological properties, this study reveals the straightforward and ecologically safe synthesis method to obtain new hybrid geopolymer materials for potential further use. As Mirković et al previously reported [ 32 ], fly ash from the Nikola Tesla power plant (FA01) showed appropriate characteristics for cement clinker preparation in both chemical and radiological terms. This study represents a continuation of the previously [ 32 ] mentioned one.…”

Section: Introductionmentioning

confidence: 91%

“…As Mirković et al previously reported [ 32 ], fly ash from the Nikola Tesla power plant (FA01) showed appropriate characteristics for cement clinker preparation in both chemical and radiological terms. This study represents a continuation of the previously [ 32 ] mentioned one. We present the morphological, mechanical, and radiological characteristics of cement materials synthesized from a siliceous type of fly ash (FA01).…”

Section: Introductionmentioning

confidence: 91%

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Potential Usage of Hybrid Polymers Binders Based on Fly Ash with the Addition of PVA with Satisfying Mechanical and Radiological Properties

Mirković

Kljajević

Dolenec

et al. 2021

Gels

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Since recycled technologies usage is mandatory for environmental safety, and in this regard, it is important to examine new materials that can be used in construction and are primarily produced from fly ash. In addition to characteristics such as hardness and compressive strength, the given materials must also be radiologically and environmentally safe. The main concept of engineered geopolymer gel composites based on fly ash residues is focused on developing binder materials via gel formation processes that can replace ordinary cement materials. This study is unique in researching the potential use of fly ash from the Nikola Tesla thermal power plant in Serbia, where the hybrid geopolymeric materials synthesized from fly ash are experimentally examined with the addition 1 wt% and 2 wt% of polyvinyl alcohol (PVA). This paper aims to investigate the structural, morphological, mechanical, and radiological properties of hybrid materials with the addition of PVA and without additive in the period of ageing for 28 days at room temperature. The phase composition was investigated using X-ray powder diffraction (XRPD) analysis, while morphological characteristics of these materials were examined using scanning electron microscopy and energy dispersive X-ray analysis (SEM-EDS). Vibrational spectra of obtained samples are investigated using diffuse reflectance infrared Fourier transform (DRIFT) and Fourier transform infrared (FTIR) techniques. The hardness and compressive strength are also examined, indicating that the 1 wt% addition in geopolymeric matrix results in the best mechanical properties. Radiological measurements of investigated all geopolymer samples show decreasing activity concentrations of radionuclides for 50% compared to fly ash.

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Section: Resultsmentioning

confidence: 64%

Section: Resultsmentioning

confidence: 65%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 91%

See 3 more Smart Citations

Potential Usage of Hybrid Polymers Binders Based on Fly Ash with the Addition of PVA with Satisfying Mechanical and Radiological Properties

Mirković

Kljajević

Dolenec

et al. 2021

Gels

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Firing-Associated Recycling of Coal-Fired Power Plant Fly Ash

Minh

Pham

Tung

et al. 2023

Journal of Analytical Methods in Chemistry

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Coal-fired power plant fly ash is a global environmental concern due to its small particle size, heavy metal content, and increased emissions. Although widely used in concrete, geopolymer, and fly ash brick production, a large amount of fly ash remains in storage sites or is used in landfills due to inadequate raw material quality, resulting in a waste of a recoverable resource. Therefore, the ongoing need is to develop new methods for recycling fly ash. The present review differentiates the physiochemical properties of fly ash from two coal combustion processes: fluidized bed combustion and pulverized coal combustion. It then discusses applications that can consume fly ash without strict chemical requirements, focusing on firing-associated methods. Finally, the challenges and opportunities of fly ash recycling are discussed.

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Thermodynamic Irreversibility Analysis of Thermal Radiation in Coal-Fired Furnace: Effect of Coal Ash Deposits

Zhang

Lou

2023

Materials

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In this paper, a three-dimensional (3-D) high-temperature furnace filled with a gas-solid medium was investigated, and the radiative transfer equation and the radiative entropy transfer equation in the chamber were applied in order to analyze the effect of coal deposits on thermal radiation. The heat flux on the walls of the furnace and the entropy generation rate were determined due to the irreversibility of the radiative heat transfer process in the furnace. Furthermore, the effect of ash deposits on the wall surface on the irreversibility of the radiation heat transfer process was investigated. The numerical results show that when burning bituminous and sub-bituminous coal, ash deposits in the furnace led to a 48.2% and 63.2% decrease in wall radiative heat flux and a 9.1% and 12.4% decrease in the radiative entropy rate, respectively. The ash deposits also led to an increase in the entropy generation number and a decrease in the thermodynamic efficiency of the radiative heat transfer process in the furnace.

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Fly ash as a raw material for low-carbon cement clinkers and its radiological properties

Cited by 4 publications

References 37 publications

Potential Usage of Hybrid Polymers Binders Based on Fly Ash with the Addition of PVA with Satisfying Mechanical and Radiological Properties

Potential Usage of Hybrid Polymers Binders Based on Fly Ash with the Addition of PVA with Satisfying Mechanical and Radiological Properties

Firing-Associated Recycling of Coal-Fired Power Plant Fly Ash

Thermodynamic Irreversibility Analysis of Thermal Radiation in Coal-Fired Furnace: Effect of Coal Ash Deposits

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