Publication detail

Shrinkage-Reducing Admixture Efficiency in Alkali-Activated Slag across the Different Doses of Activator

BÍLEK Jr., V. KALINA, L. FOJTÍK, O.

Original Title

Type

conference paper

Language

English

Original Abstract

One of the largest obstacles for the wider use of alkali-activated slag (AAS) in a building industry is its severe drying shrinkage. According to some studies shrinkage-reducing admixtures (SRAs) could be a solution of this problem, but they were also reported to have a fatal impact on AAS hydration resulting in a serious strength development slowdown. The aim of this paper was to investigate this phenomenon in a wide range of the waterglass doses (4–12% Na2O of the slag mass). Mortars without and with 2% of SRA based on hexylene glycol were prepared and their shrinkage and compressive strength development was tested. By far the highest shrinkage reduction was observed for the lowest doses of waterglass, but these were also the cases of the highest compressive strength decrease. However, it is possible to suppress the negative effect of SRA on AAS strength development through the activator dose increase with certainly decreased shrinkage reducing ability of SRA.

Keywords

Alkali-activated slag, shrinkage-reducing admixture, activator dose, drying shrinkage, compressive strength

Authors

BÍLEK Jr., V.; KALINA, L.; FOJTÍK, O.

Released

22. 1. 2018

ISBN

1013-9826

Periodical

Key Engineering Materials (print)

Year of study

761

Number

State

Swiss Confederation

Pages from

Pages to

Pages count

BibTex

@inproceedings{BUT145020,
  author="Vlastimil {Bílek} and Lukáš {Kalina} and Ondřej {Fojtík}",
  title="Shrinkage-Reducing Admixture Efficiency in Alkali-Activated Slag across the Different Doses of Activator",
  booktitle="Non-Traditional Cement and Concrete",
  year="2018",
  journal="Key Engineering Materials (print)",
  volume="761",
  number="",
  pages="19--22",
  doi="10.4028/www.scientific.net/KEM.761.19",
  issn="1013-9826"
}