Detail publikačního výsledku

Synthesis of calcium aluminate hydrates, their characterization and dehydration

KOPLÍK, J.; ŠVEC, J.; MÁSILKO, J.; SEDLAČÍK, M.; BARTONÍČKOVÁ, E.

Originální název

Synthesis of calcium aluminate hydrates, their characterization and dehydration

Anglický název

Synthesis of calcium aluminate hydrates, their characterization and dehydration

Druh

Článek WoS

Originální abstrakt

This study is focused on the description of the dehydration of calcium aluminate hydrates (CAHs) and their identification. Four calcium aluminates (CA, C12A7, C3A, CA2) prepared by high temperature solid-state synthesis or modified Pechini synthesis served as precursors for CAHs. Hydration was carried out at the various temperatures in a range of 5-60 degrees C for 48 h. CAHs were identified by X-ray diffraction analysis (XRD) and their dehydration was characterized by Thermogravimetry and effluent gas analysis (TG/EGA) and high temperature XRD. Pure C3AH6 and CAH10 were successfully prepared, other CAHs (C2AH8, C4AH19, AH3, C4A C H11) were present in the mixtures. The results indicate that dehydration of C3AH6 takes place at a temperature of about 300 degrees C, followed by the formation of a new product with a structure similar to C12A7. C2AH8 dehydration can be described in three steps. The dehydration is accompanied by the formation of crystalline intermediate products. CAH10 dehydration can be assigned to a broad peak on the DTG curve with a maximum at approximately 100 degrees C. The decomposition of C4A C H11 takes place in two steps, with CO2 evolving in the temperature range 500-700 degrees C.

Anglický abstrakt

This study is focused on the description of the dehydration of calcium aluminate hydrates (CAHs) and their identification. Four calcium aluminates (CA, C12A7, C3A, CA2) prepared by high temperature solid-state synthesis or modified Pechini synthesis served as precursors for CAHs. Hydration was carried out at the various temperatures in a range of 5-60 degrees C for 48 h. CAHs were identified by X-ray diffraction analysis (XRD) and their dehydration was characterized by Thermogravimetry and effluent gas analysis (TG/EGA) and high temperature XRD. Pure C3AH6 and CAH10 were successfully prepared, other CAHs (C2AH8, C4AH19, AH3, C4A C H11) were present in the mixtures. The results indicate that dehydration of C3AH6 takes place at a temperature of about 300 degrees C, followed by the formation of a new product with a structure similar to C12A7. C2AH8 dehydration can be described in three steps. The dehydration is accompanied by the formation of crystalline intermediate products. CAH10 dehydration can be assigned to a broad peak on the DTG curve with a maximum at approximately 100 degrees C. The decomposition of C4A C H11 takes place in two steps, with CO2 evolving in the temperature range 500-700 degrees C.

Klíčová slova

Calcium aluminate hydrates; Thermal analysis; High-temperature X-ray diffraction; Dehydration; Calcium aluminate phases

Klíčová slova v angličtině

Calcium aluminate hydrates; Thermal analysis; High-temperature X-ray diffraction; Dehydration; Calcium aluminate phases

Autoři

KOPLÍK, J.; ŠVEC, J.; MÁSILKO, J.; SEDLAČÍK, M.; BARTONÍČKOVÁ, E.

Vydáno

03.02.2025

Nakladatel

ELSEVIER SCI LTD

Místo

London

ISSN

1873-3956

Periodikum

Ceramics International

Svazek

51

Číslo

5

Stát

Spojené království Velké Británie a Severního Irska

Strany od

5536

Strany do

5543

Strany počet

8

URL

https://www.sciencedirect.com/science/article/pii/S027288422401931X

BibTex

@article{BUT197470,
  author="Jan {Koplík} and Jiří {Švec} and Jiří {Másilko} and Martin {Sedlačík} and Eva {Bartoníčková}",
  title="Synthesis of calcium aluminate hydrates, their characterization and dehydration",
  journal="Ceramics International",
  year="2025",
  volume="51",
  number="5",
  pages="5536--5543",
  doi="10.1016/j.ceramint.2024.05.071",
  issn="0272-8842",
  url="https://www.sciencedirect.com/science/article/pii/S027288422401931X"
}