Publication detail

MONITORING THE INTERNAL STRUCTURE BEHAVIOUR OF ALKALI-ACTIVATED SLAG PASTE: EFFECT OF THE CURING MODE

NÁPRAVNÍK, P. KOCÁB, D. BÍLEK, V. LISZTWAN, D. KUCHARCZYKOVÁ, B.

Original Title

Type

journal article in Web of Science

Language

English

Original Abstract

This paper deals with the monitoring of the internal structure behaviour of an alkali -activated slag (AAS) paste. The slag was activated with a 4M solution of sodium hydroxide. The behaviour of the internal structure of the paste was regularly monitored through the changes in the resonant frequency and the mechanical properties, until the paste reached the age of 90 days. The main aim of the article is to show the long-term maturation and degradation process of an AAS paste under different curing modes. The results obtained suggest that the curing mode of the specimens has a significant effect on the behaviour of the internal structure of the paste based on the AAS. The development of both the dynamic properties and the flexural strength indicates the occurrence of a higher porosity in the internal structure of the paste, especially when the free drying process is started earlier. Insufficient hydration of the binder system is also a likely cause of cracks. The reduction in the relative dynamic moduli values ranging from 50 % to 80 % was observed for drying specimens at the age of 90 days. What is very interesting is that the occurrence of cracks was not prevented even by intensive moist curing of the paste as, between the 21st and the 28th day of maturing, there was a significant decrease of about 20 % in the relative dynamic modulus of elasticity and also a 50 % reduction in the flexural strength.

Keywords

Alkali-activated slag; resonance method; resonant frequency; curing mode; flexural strength; crack

Authors

NÁPRAVNÍK, P.; KOCÁB, D.; BÍLEK, V.; LISZTWAN, D.; KUCHARCZYKOVÁ, B.

Released

31. 12. 2023

Publisher

CZECH TECHNICAL UNIV PRAGUE

Location

PRAHA 6

ISBN

1805-2363

Periodical

Acta Polytechnica (on-line)

Year of study

Number

State

Czech Republic

Pages from

411

Pages to

418

Pages count

URL

https://ojs.cvut.cz/ojs/index.php/ap/article/view/9186

Full text in the Digital Library

http://hdl.handle.net/11012/245201

BibTex

@article{BUT186975,
  author="Petr {Nápravník} and Dalibor {Kocáb} and Vlastimil {Bílek} and Dominik {Lisztwan} and Barbara {Kucharczyková}",
  title="MONITORING THE INTERNAL STRUCTURE BEHAVIOUR OF ALKALI-ACTIVATED SLAG PASTE: EFFECT OF THE CURING MODE",
  journal="Acta Polytechnica (on-line)",
  year="2023",
  volume="63",
  number="6",
  pages="411--418",
  doi="10.14311/AP.2023.63.0411",
  issn="1805-2363",
  url="https://ojs.cvut.cz/ojs/index.php/ap/article/view/9186"
}