Detail publikace

Effect of amino alcohol admixtures on alkali-activated materials

Originální název

Effect of amino alcohol admixtures on alkali-activated materials

Anglický název

Effect of amino alcohol admixtures on alkali-activated materials

Jazyk

en

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.

Anglický 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.

BibTex


@article{BUT164245,
  author="Lukáš {Kalina} and Vlastimil {Bílek} and Eva {Bartoníčková}",
  title="Effect of amino alcohol admixtures on alkali-activated materials",
  annote="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.",
  chapter="164245",
  doi="10.17222/mit.2019.150",
  howpublished="online",
  number="3",
  volume="54",
  year="2020",
  month="january",
  pages="349--353",
  type="journal article in Web of Science"
}

Odpovědnost: Ing. Jan Brada