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

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

English Title

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

Type

conference paper

Language

en

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.

English 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

Released

22.01.2018

Pages from

19

Pages to

22

Pages count

4

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",
  annote="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.",
  booktitle="Non-Traditional Cement and Concrete",
  chapter="145020",
  doi="10.4028/www.scientific.net/KEM.761.19",
  howpublished="online",
  number="",
  year="2018",
  month="january",
  pages="19--22",
  type="conference paper"
}