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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
http://mit.imt.si/izvodi/mit203/kalina.pdf
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" }