Detail publikace

Hydration kinetics of C3A: effect of lithium, copper and sulfur-based mineralizers

BARTONÍČKOVÁ, E. PTÁČEK, P. NOVOTNÝ, R. PALOVČÍK, J. MÁSILKO, J. ŠVEC, J. SEDLAČÍK, M. KOPLÍK, J. STANĚK, T. HEMZAL, D.

Originální název

Hydration kinetics of C3A: effect of lithium, copper and sulfur-based mineralizers

Typ

článek v časopise ve Web of Science, Jimp

Jazyk

angličtina

Originální abstrakt

Calcium aluminate phases have a particular effect on the early heat release during setting initiation and have a substantial influence on the further workability of ordinary Portland cement. The nature of the calcium aluminate hydration products and its kinetics strongly depends on sulfate content and humidity. The effect of mineralisers on melt formation and viscosity is well described for calcium silicate systems, but information is still lacking for calcium aluminates. Therefore, the synergistic effect on the crystal structure and hydration mechanism of the tricalcium aluminate phase of the addition of mineralizers, i.e. Li2O, CuO, SO3 to the raw meal is here investigated. Co-doped calcium aluminate structures were formed during high-temperature treatment. Thermal analysis (TG-DTA and heating microscopy) was used to describe the ongoing high-temperature reaction. Resulting phase composition was dependent on the concentration of the mineralizer. While phase pure system was prepared with low mineralizer concentrations, with increasing mineralizer content the secondary phases were formed. Raman spectroscopy and XPS analysis were used to investigate the cation substitution and to help describe the cations bonding in co-doped calcium aluminate system. Prepared powders have been hydrated in a controlled manner at different temperatures (288, 298, 308 K). The resulting calorimetric data have been used to investigate the hydration kinetics and determine the rate constant of hydration reaction. First-order reaction (FOR) model was here applied for the activation energy and frequency factor calculations. The metastable and stable calcium aluminate hydrates were formed according to initial phase composition. In phase pure systems with low S content, the formation of stable and metastable hydrates was depended on the reaction temperature. Conversely, in systems with secondary phases and higher S content, the hydration mechanism resembled that which appears in calcium sulfoaluminates.

Klíčová slova

C(3)ASynthesisHydrationIsothermal calorimetryKineticsActivation energy

Autoři

BARTONÍČKOVÁ, E.; PTÁČEK, P.; NOVOTNÝ, R.; PALOVČÍK, J.; MÁSILKO, J.; ŠVEC, J.; SEDLAČÍK, M.; KOPLÍK, J.; STANĚK, T.; HEMZAL, D.

Vydáno

16. 9. 2024

Nakladatel

Springer Nature

ISSN

1388-6150

Periodikum

Journal of Thermal Analysis and Calorimetry

Číslo

jaro

Stát

Maďarsko

Strany počet

17

URL

https://link.springer.com/article/10.1007/s10973-024-13525-6#citeas

BibTex

@article{BUT190099,
  author="Eva {Bartoníčková} and Petr {Ptáček} and Radoslav {Novotný} and Jakub {Palovčík} and Jiří {Másilko} and Jiří {Švec} and Martin {Sedlačík} and Jan {Koplík} and Theodor {Staněk} and Dušan {Hemzal}",
  title="Hydration kinetics of C3A: effect of lithium, copper and sulfur-based mineralizers",
  journal="Journal of Thermal Analysis and Calorimetry",
  year="2024",
  number="jaro",
  pages="17",
  doi="10.1007/s10973-024-13525-6",
  issn="1388-6150",
  url="https://link.springer.com/article/10.1007/s10973-024-13525-6#citeas"
}