Synthesis and performance of aluminous cements containing zirconium and strontium as alternatives to the calcium aluminate cements designed for the production of high performance refractories

Madej, Dominika; Sieroń, Katarzyna; Kruk, Andrzej

doi:10.1016/j.cemconcomp.2022.104518

Cited by 10 publications

(6 citation statements)

References 28 publications

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“…We agree that the R 1 can be considered as the total resistance, based on our previous investigation, where this effect was also observed. These studies were focussed on the detailed examination of the calcium zirconium aluminate cement, calcium aluminate cement, strontium aluminate cement, OPC-based cement pastes and castables (7,8,10,(21)(22). In this EEC model, C is the double layer capacitance at the electrode/ cement paste interface, Warburg impedance elements, W 1 and W 2 characterize the slow ionic diffusion effects at the electrode interface at low frequencies and diffusion of the active particles inside cement paste and R 2 is connected with the charge transfer resistance at the electrode/cement paste interface (19,21).…”

Section: Time-resolved Electrochemical Impedance Spectroscopy [Tr-eis...mentioning

confidence: 99%

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Classical and new insights into the methodology for characterizing the hydration of calcium aluminate cements

Madej,

Kruk

2024

Cement Wapno Beton

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Calcium aluminate cements [CACs] are typically used for cast-in-place structural work and high temperature applications due to their unique properties. The CaAl2O4 [CA] and Sm-doped CaAl2O4 [CA:Sm] cement clinkers obtained by the solid-state reaction were investigated using X-ray powder diffraction [XRD], scanning electron microscopy [SEM] and energy dispersive X-ray spectroscopy [EDS] and luminescence spectroscopy. The XRD result shows that the powders are pure CaAl2O4. As a next step, hydration behavior of as-synthesized cements was investigated by both classical methods including isothermal calorimetry and XRD, and the state-of-the-art techniques including time resolved electrochemical impedance spectroscopy [TR-EIS] and luminescence spectroscopy. The TR-EIS investigations were obtained by the Impedance Camera over the range of 100 Hz to 1 MHz frequencies. The evolution of obtained EIS and luminescence spectra easily manifested the beginning of the new solid formation and the hydration kinetics. The dynamics of hydration processes were also successfully traced by the changes of the luminescence intensity from the Sm3+ ions. This technique seems to be complementary, and consistent with other methods implemented in the cement chemistry, especially to investigate e.g. hydration of ordinary Portland cements [OPCs] and other binders.

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Section: Time-resolved Electrochemical Impedance Spectroscopy [Tr-eis...mentioning

confidence: 99%

“…During hydration of cement, the main phases of CACs, i.e. CA, (1,(7)(8). The C 3 AH 6 can be also formed directly in the hydration reaction of CA or CA 2 above ca.…”

Section: Introductionmentioning

confidence: 99%

Classical and new insights into the methodology for characterizing the hydration of calcium aluminate cements

Madej,

Kruk

2024

Cement Wapno Beton

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“…Calcium aluminate, as an inorganic compound in Al 2 O 3 -CaO binary system, exhibits great application promising in the fields of high alumina cement, refractory, photocatalysts, optical devices, flame detectors, dental cements and biomaterials [1–5]. Calcium aluminate nanoparticles with an average crystalline size of 8.34 nm exhibited good photocatalytic performance towards Coralene Dark Red 2B azo under solar irradiation [6].…”

Section: Introductionmentioning

confidence: 99%

A visible light-sensitive argentous oxide/calcium aluminate nanocomposite photocatalyst

Sun,

Cong,

Wang

et al. 2023

Materials Science and Technology

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A photo-deposition method was developed to synthesise argentous oxide/calcium aluminate nanocomposites (Ag2O-CAONCS) with orthorhombic Ca5Al6O14 and cubic Ag2O phases. Micro-morphology, micro-structure, optical, and visible-light catalytic properties were investigated via different techniques. Ag2O enhances visible-light absorption performance and decreases the band gap of the Ag2O-CAONCS. About 20 mL crystal violet (CV) dye (10 mgL–1) is totally degraded using 20 mg Ag2O-CAONCS under sunlight irradiation for 20 min. The enhanced photocatalytic activity of the Ag2O-CAONCS towards CV under sunlight irradiation is ascribed to the reduction of the band gap, improvement in visible-light absorption and inhibitation role of carriers recombination by Ag2O. The high, stable visible-light catalytic activity makes Ag2O-CAONCS promising photocatalysts for removing organic pollutants.

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“…Ca aluminate is important aluminate showing great application in optical, catalytic, ceramics, and biomaterials fields owing to good physical, mechanical, catalytic, and biocompatible properties [1,2]. Hermansson [3] reviewed the use of Ca aluminate nanoscale materials as biomaterials which can be used in the fields of odontology, orthopaedics, and drug delivery carrier materials.…”

Section: Introductionmentioning

confidence: 99%

Significantly Enhanced Photocatalytic Performance of Ag-doped Calcium Aluminate under Visible-light Irradiation

Cong,

Sun,

Wang

et al. 2023

e-J. Surf. Sci. Nanotechnol.

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Ag-doped Ca aluminate with different Ag dopant content and polycrystalline structure were obtained via a direct one-step chemical approach using Ag acetate as Ag doping source. Agdoped Ca aluminate is composed of orthorhombic Ca 5 Al 6 O 14 and monoclinic CaAl 2 O 4 phases. The morphology transformation of Ag-doped Ca aluminate from nanoflakes to microscale and nanoscale particles closely depends on Ag dopant content. Ag doping effectively improves visible-light absorption ability and 8 wt% Ag-doped Ca aluminate exhibits the lowest band gap of 1.97 eV. Ag-doped Ca aluminate shows enhanced visible-light photocatalytic activity towards gentian violet than un-doped Ca aluminate under natural sunlight irradiation. 20 mL gentian violet solution (10 mg L −1 ) is totally degraded using 20 mg of 8 wt% Ag-doped Ca aluminate with sunlight irradiation for 30 min and reaction rate constant k of 0.034 min −1 . Visible-light photocatalytic activity is greatly enhanced by Ag doping owing to narrow band gap, low recombination efficiency of charge carriers, high charge transfer efficiency.

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Synthesis and performance of aluminous cements containing zirconium and strontium as alternatives to the calcium aluminate cements designed for the production of high performance refractories

Cited by 10 publications

References 28 publications

Classical and new insights into the methodology for characterizing the hydration of calcium aluminate cements

Classical and new insights into the methodology for characterizing the hydration of calcium aluminate cements

A visible light-sensitive argentous oxide/calcium aluminate nanocomposite photocatalyst

Significantly Enhanced Photocatalytic Performance of Ag-doped Calcium Aluminate under Visible-light Irradiation

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