Publication detail

Effectiveness of common water-reducing admixtures in alkali-activated slag pastes with different types of activator

BÍLEK, V. ILIUSHCHENKO, V. HRUBÝ, P. KALINA, L.

Original Title

Effectiveness of common water-reducing admixtures in alkali-activated slag pastes with different types of activator

Type

conference paper

Language

English

Original Abstract

Rheology of alkali-activated slag (AAS) is a very complex issue, where the activator nature as well as its dose play an important role. Moreover, the use of water-reducing admixtures in these systems is an issue, as they often do not work properly. This could be attributed to the high pH as well as to the surface chemistry of AAS. Therefore, lignosulfonate-, polynaphthalene- and polycarboxylate-based superplasticizers were used to modify AAS pastes with sodium waterglass, hydroxide and carbonate activator. These pastes were tested using a rotational rheometer in an oscillatory shear mode of increasing shear strain to observe the evolution of viscoelastic moduli and to determine the oscillatory stress corresponding to the linear viscoelastic region limit ("yield point") and to the crossover point, where the storage modulus equals the loss modulus ("flow point"). In most cases, the used plasticizers did not improve the rheological properties; the only exception was the lignosulfonate one in sodium hydroxide-activated slag.

Keywords

alkali-activated slag; rheology; plasticizer; amplitude sweep, activator

Authors

BÍLEK, V.; ILIUSHCHENKO, V.; HRUBÝ, P.; KALINA, L.

Released

23. 11. 2021

Publisher

IOP Publishing

ISBN

1757-8981

Periodical

IOP Conference Series: Materials Science and Engineering

Year of study

1205

Number

1

State

United Kingdom of Great Britain and Northern Ireland

Pages from

1

Pages to

7

Pages count

7

URL

https://iopscience.iop.org/article/10.1088/1757-899X/1205/1/012001

Full text in the Digital Library

http://hdl.handle.net/11012/203537

BibTex

@inproceedings{BUT175931,
  author="Vlastimil {Bílek} and Valeriia {Hrubá} and Petr {Hrubý} and Lukáš {Kalina}",
  title="Effectiveness of common water-reducing admixtures in alkali-activated slag pastes with different types of activator",
  booktitle="International Conference Building Materials, Products and Technologies (ICBMPT 2021)",
  year="2021",
  journal="IOP Conference Series: Materials Science and Engineering",
  volume="1205",
  number="1",
  pages="1--7",
  publisher="IOP Publishing",
  doi="10.1088/1757-899X/1205/1/012001",
  issn="1757-8981",
  url="https://iopscience.iop.org/article/10.1088/1757-899X/1205/1/012001"
}