Detail publikace

Effect of amino alcohol admixtures on alkali-activated materials

KALINA, L. BÍLEK, V. BARTONÍČKOVÁ, E.

Originální název

Effect of amino alcohol admixtures on alkali-activated materials

Typ

článek v časopise ve Web of Science, Jimp

Jazyk

angličtina

Originální abstrakt

One of the most important technological problems associated with alkali-activated materials (AAM) is large shrinkage. Apossible solution to decrease the extensive drying shrinkage of these materials is the use of shrinkage-reducing admixtures(SRAs). The promising group of SRAs, from the perspective of using in AAMs, are amino alcohols. However, the efficiency ofreducing the drying shrinkage strongly depends on their chemical structure. Hence, the study is focused on the moleculararchitecture of amino alcohol surfactants and its relation to the affected properties of alkali-activated blast-furnace slag systems. Selected amino alcohols were tested in terms of the ability to reduce the surface tension of pore solution as well as to influencethe drying shrinkage, hydration mechanism and mechanical properties of AAMs. The study confirms that the length andbranching of the alkyl chain linked to the amino group play the key role in SRA efficiency. Amino alcohol surfactants with ahigh-carbon alkyl chain decreased dramatically both the surface tension and the drying shrinkage, but simultaneously negativelyaffected the process of alkali activation, resulting in a deterioration of the mechanical properties. Conversely, the addition of0.5w/ % of the surfactants with a low molecular weight, such as 2-(Methylamino)ethanol, showed a slight improvement of thecompressive strength after 7 d and 28 d, and at the same time reduced the drying shrinkage by 30 % compared to the referencesample.

Klíčová slova

amino alcohols, admixture, drying shrinkage, alkali-activated materials

Autoři

KALINA, L.; BÍLEK, V.; BARTONÍČKOVÁ, E.

Vydáno

29. 1. 2020

ISSN

1580-2949

Periodikum

Materiali in tehnologije

Ročník

54

Číslo

3

Stát

Slovinská republika

Strany od

349

Strany do

353

Strany počet

5

URL

BibTex

@article{BUT164245,
  author="Lukáš {Kalina} and Vlastimil {Bílek} and Eva {Bartoníčková}",
  title="Effect of amino alcohol admixtures on alkali-activated materials",
  journal="Materiali in tehnologije",
  year="2020",
  volume="54",
  number="3",
  pages="349--353",
  doi="10.17222/mit.2019.150",
  issn="1580-2949",
  url="http://mit.imt.si/izvodi/mit203/kalina.pdf"
}