Publication detail

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.

Original Title

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

Type

journal article in Web of Science

Language

English

Original Abstract

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.

Keywords

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

Authors

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

Released

29. 12. 2021

Publisher

MDPI

Location

Basel, Switzerland

ISBN

1996-1944

Periodical

Materials

Year of study

15

Number

1

State

Swiss Confederation

Pages from

1

Pages to

21

Pages count

21

URL

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

Full text in the Digital Library

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"
}