Detail publikace

Experimental Study of Slag Changes during the Very Early Stages of Its Alkaline Activation

BÍLEK, V. HRUBÝ, P. ILIUSHCHENKO, V. KOPLÍK, J. KŘIKALA, J. MARKO, M. HAJZLER, J. KALINA, L.

Originální název

Experimental Study of Slag Changes during the Very Early Stages of Its Alkaline Activation

Typ

článek v časopise ve Web of Science, Jimp

Jazyk

angličtina

Originální abstrakt

The very early stages of alkaline activation of slag control its rheology and setting, but also affect its hydration, which occurs later. Simultaneously, these parameters are dictated by the nature and dose of the alkaline activator. Therefore, we investigated and compared the changes in slag particles (SEM, BET, laser diffraction), as well as in the pore solution composition (ICP–OES), pH, and conductivity, of alkali-activated slag (AAS) pastes containing the three most common sodium activators (waterglass, hydroxide, and carbonate) and water during the first 24 h of its activation. To ensure the best possible comparability of the pastes, a fairly nontraditional mixture design was adopted, based on the same concentration of Na+ (4 mol/dm3) and the same volume fraction of slag in the paste (0.50). The results were correlated with the pastes’ hydration kinetics (isothermal calorimetry), structural build-up (oscillatory rheology), and setting times (Vicat). Great differences were observed in most of these properties, in the formation of hydration products, and in the composition of the pore solution for each activator. The results emphasize the role of the anionic groups in the activators and of the pH, which help predict the sample’s behavior based on its calorimetric curve, and offer data for further comparisons and for the modelling of AAS hydration for specific activators.

Klíčová slova

alkali-activated slag; activator; hydration kinetics; pore solution; scanning electron microscopy; BET surface; morphology; hydration products; setting

Autoři

BÍLEK, V.; HRUBÝ, P.; ILIUSHCHENKO, V.; KOPLÍK, J.; KŘIKALA, J.; MARKO, M.; HAJZLER, J.; KALINA, L.

Vydáno

29. 12. 2021

Nakladatel

MDPI

Místo

Basel, Switzerland

ISSN

1996-1944

Periodikum

Materials

Ročník

15

Číslo

1

Stát

Švýcarská konfederace

Strany od

1

Strany do

21

Strany počet

21

URL

https://www.mdpi.com/1996-1944/15/1/231

Plný text v Digitální knihovně

http://hdl.handle.net/11012/203313

BibTex

@article{BUT175897,
  author="Vlastimil {Bílek} and Petr {Hrubý} and Valeriia {Hrubá} and Jan {Koplík} and Jakub {Křikala} and Michal {Marko} and Jan {Hajzler} and Lukáš {Kalina}",
  title="Experimental Study of Slag Changes during the Very Early Stages of Its Alkaline Activation",
  journal="Materials",
  year="2021",
  volume="15",
  number="1",
  pages="1--21",
  doi="10.3390/ma15010231",
  issn="1996-1944",
  url="https://www.mdpi.com/1996-1944/15/1/231"
}