Publication detail

Structural build-up and breakdown of sodium hydroxide-activated slag paste assessed using oscillatory rheology

BÍLEK, V. PAZOUR, M.

Original Title

Structural build-up and breakdown of sodium hydroxide-activated slag paste assessed using oscillatory rheology

Type

conference paper

Language

English

Original Abstract

Concentrated suspensions of inorganic binders are thixotropic fluids with non-Newtonian behaviour. In addition to the physical-chemical interactions responsible for the flocculation of the particles, the rheological behaviour in time is affected by the formation of the reaction products. In this paper, this topic was tackled using oscillatory rheology, namely, by increasingly used measurements at the constant strain amplitude and frequency over time (time sweep test), by the combination of these tests with an inserted rotational step (ORO test), and by almost unexplored oscillation amplitude sweep tests, leading to structural breakdown due to increasing strain amplitude. Common sodium hydroxide-activated slag paste was used for this purpose. The results showed that the recovery of the structure is not significantly altered if the sample is remixed at least after 30 minutes of reaction. In addition, the strain sweep tests suggested that the formation of the first reaction products started after about 15 minutes of reaction and had a decisive impact on the evolution of viscoelastic moduli and the corresponding stresses during this kind of test.

Keywords

alkali-activated slag; structural build-up; structural breakdown; oscillatory rheology; sodium hydroxide

Authors

BÍLEK, V.; PAZOUR, M.

Released

3. 10. 2022

ISBN

1742-6588

Periodical

Journal of Physics: Conference Series

Year of study

2341

Number

1

State

United Kingdom of Great Britain and Northern Ireland

Pages count

8

URL

https://iopscience.iop.org/article/10.1088/1742-6596/2341/1/012001

BibTex

@inproceedings{BUT180040,
  author="Vlastimil {Bílek} and Miroslav {Pazour}",
  title="Structural build-up and breakdown of sodium hydroxide-activated slag paste assessed using oscillatory rheology",
  booktitle="25th International Conference Building Materials, Products and Technologies, ICBMPT 2022",
  year="2022",
  journal="Journal of Physics: Conference Series",
  volume="2341",
  number="1",
  pages="8",
  doi="10.1088/1742-6596/2341/1/012001",
  issn="1742-6588",
  url="https://iopscience.iop.org/article/10.1088/1742-6596/2341/1/012001"
}