Detail publikačního výsledku

Mapping the effects of activator type and molarity on the rheology of alkali-activated slag using oscillation amplitude testing

MARKUSÍK, D.; SOKOLA, P.; BÍLEK, V.

Originální název

Mapping the effects of activator type and molarity on the rheology of alkali-activated slag using oscillation amplitude testing

Anglický název

Mapping the effects of activator type and molarity on the rheology of alkali-activated slag using oscillation amplitude testing

Druh

Článek WoS

Originální abstrakt

This study investigates the effects of activator type and concentration, namely sodium and potassium hydroxides, carbonates, and silicates, on the rheological behaviour of alkali activated slag pastes. Oscillation amplitude sweep tests in both strain- and stress-controlled modes were conducted to evaluate key parameters such as yield point and break point. Increasing activator concentration generally improved workability up to a threshold between 5 and 7.5 M, beyond which rheological properties deteriorated due to changes in microstructure and viscosity. This threshold was less pronounced for KOH and K2CO3. Alkali silicates exhibited the strongest plasticizing effect and, uniquely, shifted the viscoelastic nature of the pastes from solid-like to liquid-like (significantly increased loss factor). Complementary mini-slump and zeta potential tests supported the oscillatory findings and revealed limitations at extreme concentrations. The results highlight the distinct impacts of different combinations of Na+ and K+ cations and various anions on the rheology of alkali-activated slag pastes.

Anglický abstrakt

This study investigates the effects of activator type and concentration, namely sodium and potassium hydroxides, carbonates, and silicates, on the rheological behaviour of alkali activated slag pastes. Oscillation amplitude sweep tests in both strain- and stress-controlled modes were conducted to evaluate key parameters such as yield point and break point. Increasing activator concentration generally improved workability up to a threshold between 5 and 7.5 M, beyond which rheological properties deteriorated due to changes in microstructure and viscosity. This threshold was less pronounced for KOH and K2CO3. Alkali silicates exhibited the strongest plasticizing effect and, uniquely, shifted the viscoelastic nature of the pastes from solid-like to liquid-like (significantly increased loss factor). Complementary mini-slump and zeta potential tests supported the oscillatory findings and revealed limitations at extreme concentrations. The results highlight the distinct impacts of different combinations of Na+ and K+ cations and various anions on the rheology of alkali-activated slag pastes.

Klíčová slova

Alkali-activated slag, Rheology, Oscillatory measurement, Activator concentration, Activator type, Surface chemistry

Klíčová slova v angličtině

Alkali-activated slag, Rheology, Oscillatory measurement, Activator concentration, Activator type, Surface chemistry

Autoři

MARKUSÍK, D.; SOKOLA, P.; BÍLEK, V.

Vydáno

01.03.2026

Nakladatel

Elsevier

Periodikum

Open Ceramics

Svazek

25

Číslo

March

Stát

Spojené království Velké Británie a Severního Irska

Strany počet

13

URL

https://www.sciencedirect.com/science/article/pii/S2666539526000131?via%3Dihub

BibTex

@article{BUT201560,
  author="{} and David {Markusík} and  {} and Patrik {Sokola} and  {} and Vlastimil {Bílek}",
  title="Mapping the effects of activator type and molarity on the rheology of alkali-activated slag using oscillation amplitude testing",
  journal="Open Ceramics",
  year="2026",
  volume="25",
  number="March",
  pages="13",
  doi="10.1016/j.oceram.2026.100920",
  url="https://www.sciencedirect.com/science/article/pii/S2666539526000131?via%3Dihub"
}