Publication detail

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

Type

conference paper

Language

English

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

Keywords

alcali activated slag, shrinkage reducing admixture, isopropanol, shrinkage

Authors

KOTRLA, J.; ŠOUKAL, F.; BÍLEK, V.; ALEXA, M.

Released

14. 8. 2019

ISBN

1757-8981

Periodical

IOP Conference Series: Materials Science and Engineering

Year of study

583

Number

1

State

United Kingdom of Great Britain and Northern Ireland

Pages from

1

Pages to

8

Pages count

8

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"
}