The impact of Al2O3 amount on the synthesis of CASH samples and their influence on the early stage hydration of calcium aluminate cement

Baltakys, K.; Eisinas, Anatolijus; Donėlienė, Jolanta; Dambrauskas, Tadas; Sarapajevaite, Gabriele

doi:10.1016/j.ceramint.2018.07.286

Cited by 23 publications

(6 citation statements)

References 32 publications

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“…It was determined that the formation sequence of calcium silicates hydrates in the mixtures with the molar ratio of CaO/(SiO 2 + Al 2 O 3 ) = 1.5 and Al 2 O 3 /(SiO 2 + Al 2 O 3 ) = 0.05 under hydrothermal conditions at 200°C are similar to that reported in the literature [25,[34][35][36][37]. For this reason, in this work, only a short discussion of compounds in CaO-SiO 2 -Al 2 O 3 -H 2 O system formation is presented.…”

Section: Csh Formation In Cao-sio 2 -Al 2 O 3 -H 2 O Systemsupporting

confidence: 82%

“…The more details about compounds crystallization in CaO-SiO 2 -Al 2 O 3 -H 2 O system under hydrothermal conditions are available in ref. [34,35].…”

Section: Csh Formation In Cao-sio 2 -Al 2 O 3 -H 2 O Systemmentioning

confidence: 99%

“…Also under all synthesis conditions, the carbonation proceeded, when the products were dried in an air conditioned chamber (80°C, 24 h) [34,35] because the diffraction peaks characteristic to calcite (PDF No. 04-012-0489) were observed ( Figure 2).…”

Section: The Influence Of Cr 3+ Ions On the Calcium Silicate Hydratesmentioning

confidence: 99%

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Influence of Cr³⁺, Co²⁺ and Cu²⁺ on the formation of calcium silicates hydrates under hydrothermal conditions at 200 °C

Dambrauskas

Knabikaite

Eisinas

et al. 2020

Journal of Asian Ceramic Societies

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This work aims to investigate the influence of Cr 3+ , Co 2+ and Cu 2+ on the formation of calcium silicates hydrates in CaO-SiO 2-Al 2 O 3-H 2 O system under hydrothermal conditions. The dry primary mixture with the molar ratio CaO/(SiO 2 + Al 2 O 3) = 1.5 and Al 2 O 3 /(Al 2 O 3 + SiO 2) = 0.05 was mixed with heavy metal nitrate solutions (metal ions concentration-10 g/l) to reach the water/solid ratio of the suspension equal to 10.0. The hydrothermal synthesis was carried out in unstirred suspensions, under saturated steam pressure at 200°C temperature for 0-72 hours. It was determined that nature of metal ions have influence on both mineral composition and thermal stability of synthesis products. It was obtained that by increasing synthesis temperature up to 200°C, all Cr 3+ and Co 2+ ions were intercalated into the structure of synthesis products. Meanwhile Cu 2+ ions participate in chemical reactions and as a result copper oxide were formed. The products of synthesis were characterized by STA, DSC, XRD and AAS analyses.

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Section: Csh Formation In Cao-sio 2 -Al 2 O 3 -H 2 O Systemsupporting

confidence: 82%

“…The more details about compounds crystallization in CaO-SiO 2 -Al 2 O 3 -H 2 O system under hydrothermal conditions are available in ref. [34,35].…”

Section: Csh Formation In Cao-sio 2 -Al 2 O 3 -H 2 O Systemmentioning

confidence: 99%

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Influence of Cr³⁺, Co²⁺ and Cu²⁺ on the formation of calcium silicates hydrates under hydrothermal conditions at 200 °C

Dambrauskas

Knabikaite

Eisinas

et al. 2020

Journal of Asian Ceramic Societies

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“…The diffraction patterns were recorded in a Bragg–Brentano geometry using a fast counting detector Bruker LynxEye based on a silicon strip technology. The specimens were scanned over the range 2 θ = 3–70 at a scanning speed of 6 min −1 using a coupled two theta/theta scan type 26 .…”

Section: Methodsmentioning

confidence: 99%

“…The test was carried out on a Linseis PT 1000 (Germany) instrument. The ceramic sample handlers and crucibles of Pt/10 wt%Rh were used 26 .…”

Section: Methodsmentioning

confidence: 99%

Synthesis of wollastonite from AlF3-rich silica gel and its hardening in the CO2 atmosphere

Gineika

Šiaučiūnas

Baltakys

2019

Sci Rep

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This work combines some aspects of eco-friendliness: consumption of toxic waste, cutback of energy consumption during the synthesis of the binding material, reduction of CO2 emission by using less CaCO3 in the raw meal, and consumption of carbon dioxide. In the study, the kinetics of two-step synthesis of wollastonite from CaO and AlF3 production waste, namely, silica gel, its carbonisation process and the mechanical properties of obtained samples were investigated. According to XRD and DSC data, the optimal temperature in the mixture with CaO/(Al2O3 + SiO2) = 1 for the hydrothermal synthesis of the wollastonite precursors is 130 °C: F−–containing compounds were bound into katoite and cuspidine, and portlandite reacted completely within 8 h. The optimal temperature for wollastonite formation is 900 °C, but fluormayenite, cuspidine, and the traces of larnite form as well. During the curing in the CO2 atmosphere, wollastonite and larnite reacted completely and formed calcite, vaterite, and amorphous CaCO3. Cuspidine also participates in the carbonisation process and, in addition to amorphous SiO2, it releases fluorite, which contributes to the total compressive strength of the products. The values of the compressive strength (10–15 MPa) in the wollastonite-sand samples match the requirements for the belite and special low-heat cements.

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The peculiarities of mayenite formation from synthetic katoite and calcium monocarboaluminate samples in temperature range 25–1150 °C

Eisinas

Dambrauskas

Baltakys

et al. 2019

J Therm Anal Calorim

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The impact of Al2O3 amount on the synthesis of CASH samples and their influence on the early stage hydration of calcium aluminate cement

Cited by 23 publications

References 32 publications

Influence of Cr³⁺, Co²⁺ and Cu²⁺ on the formation of calcium silicates hydrates under hydrothermal conditions at 200 °C

Influence of Cr³⁺, Co²⁺ and Cu²⁺ on the formation of calcium silicates hydrates under hydrothermal conditions at 200 °C

Synthesis of wollastonite from AlF3-rich silica gel and its hardening in the CO2 atmosphere

The peculiarities of mayenite formation from synthetic katoite and calcium monocarboaluminate samples in temperature range 25–1150 °C

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The impact of Al2O3 amount on the synthesis of CASH samples and their influence on the early stage hydration of calcium aluminate cement

Cited by 23 publications

References 32 publications

Influence of Cr3+, Co2+ and Cu2+ on the formation of calcium silicates hydrates under hydrothermal conditions at 200 °C

Influence of Cr3+, Co2+ and Cu2+ on the formation of calcium silicates hydrates under hydrothermal conditions at 200 °C

Synthesis of wollastonite from AlF3-rich silica gel and its hardening in the CO2 atmosphere

The peculiarities of mayenite formation from synthetic katoite and calcium monocarboaluminate samples in temperature range 25–1150 °C

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Product

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Influence of Cr³⁺, Co²⁺ and Cu²⁺ on the formation of calcium silicates hydrates under hydrothermal conditions at 200 °C

Influence of Cr³⁺, Co²⁺ and Cu²⁺ on the formation of calcium silicates hydrates under hydrothermal conditions at 200 °C