Detail publikačního výsledku
Effects of shrinkage-reducing admixtures on autogenous shrinkage in alkali-activated materials
KOTRLA, J.; ŠOUKAL, F.; BÍLEK, V.; ALEXA, M.
Original Title
Effects of shrinkage-reducing admixtures on autogenous shrinkage in alkali-activated materials
English Title
Effects of shrinkage-reducing admixtures on autogenous shrinkage in alkali-activated materials
Type
Paper in proceedings (conference paper)
Original Abstract
This paper deals with possible solutions of chemical and autogenous shrinkage of alkali-activated blast furnace slag (AAS). Shrinkage is the main reason why AAS is not used in practice. One of the solutions how to reduce the shrinkage is the utilization of special chemical admixtures. In concrete technology, the use of chemical compounds based on hydrocarbon alcohols is well known, however the efficiency in AAS is still very poorly elucidated. Therefore, isopropanol was used in this study. The main aim of the work was to recognize and study the relations between chemical processes in the early stages of hydration. The effect of isopropanol on alkali activation was determined by calorimetric measurements and compared with the initial and final setting time of binder. It was found out that the presence of isopropanol additive had only insignificant effect on the setting time. On the other hand, the results indicated that an increasing amount of isopropanol deaccelerates the hydration process which was represented by smaller amount of primary CSH gel formation and delayed time of secondary binder phase formation
English abstract
This paper deals with possible solutions of chemical and autogenous shrinkage of alkali-activated blast furnace slag (AAS). Shrinkage is the main reason why AAS is not used in practice. One of the solutions how to reduce the shrinkage is the utilization of special chemical admixtures. In concrete technology, the use of chemical compounds based on hydrocarbon alcohols is well known, however the efficiency in AAS is still very poorly elucidated. Therefore, isopropanol was used in this study. The main aim of the work was to recognize and study the relations between chemical processes in the early stages of hydration. The effect of isopropanol on alkali activation was determined by calorimetric measurements and compared with the initial and final setting time of binder. It was found out that the presence of isopropanol additive had only insignificant effect on the setting time. On the other hand, the results indicated that an increasing amount of isopropanol deaccelerates the hydration process which was represented by smaller amount of primary CSH gel formation and delayed time of secondary binder phase formation
Keywords
alcali activated slag, shrinkage reducing admixture, isopropanol, shrinkage
Key words in English
alcali activated slag, shrinkage reducing admixture, isopropanol, shrinkage
Authors
KOTRLA, J.; ŠOUKAL, F.; BÍLEK, V.; ALEXA, M.
RIV year
2020
Released
14.08.2019
Book
International Conference Building Materials, Product and Technologies
ISBN
1757-8981
Periodical
IOP Conference Series: Materials Science and Engineering
Volume
583
Number
1
State
United Kingdom of Great Britain and Northern Ireland
Pages from
1
Pages to
8
Pages count
8
Full text in the Digital Library
BibTex
@inproceedings{BUT157789,
author="Jan {Kotrla} and František {Šoukal} and Vlastimil {Bílek} and Martin {Alexa}",
title="Effects of shrinkage-reducing admixtures on autogenous shrinkage in alkali-activated materials",
booktitle="International Conference Building Materials, Product and Technologies",
year="2019",
journal="IOP Conference Series: Materials Science and Engineering",
volume="583",
number="1",
pages="1--8",
doi="10.1088/1757-899X/583/1/012023",
issn="1757-8981"
}