Publication detail

Thermal behaviour of metakaolin/fly ash geopolymers with chamotte aggregate

ROVNANÍK, P. ŠAFRÁNKOVÁ, K.

Original Title

Thermal behaviour of metakaolin/fly ash geopolymers with chamotte aggregate

Type

journal article in Web of Science

Language

English

Original Abstract

Geopolymers are generally appreciated for their good resistance against high temperatures. This paper compares the influence of thermal treatment with temperatures ranging from 200–1200 °C on the mechanical properties and microstructure of geopolymers based on two different aluminosilicate precursors, metakaolin and fly ash. Moreover, the paper is also aimed at characterizing the effect of chamotte aggregate on the performance of geopolymers subjected to high temperatures. Thermal treatment leads to a deterioration in the strength of metakaolin geopolymer, whereas fly ash geopolymer gains strength upon heating. The formation of albite above 900 °C is responsible for the fusion of geopolymer matrix during exposure to 1200 °C, which leads to the deformation of the geopolymer samples. Chamotte aggregate improves the performance of geopolymer material by increasing the thermal stability of geopolymers via sintering of the aggregate particles with the geopolymer matrix in the contact zone.

Keywords

geopolymer; fly ash; metakaolin; high temperatures; chamotte; microstructure

Authors

ROVNANÍK, P.; ŠAFRÁNKOVÁ, K.

Released

30. 6. 2016

Publisher

MDPI

ISBN

1996-1944

Periodical

Materials

Year of study

2016

Number

9

State

Swiss Confederation

Pages from

1

Pages to

13

Pages count

13

URL

http://www.mdpi.com/1996-1944/9/7/535

Full text in the Digital Library

http://hdl.handle.net/11012/62268

BibTex

@article{BUT126891,
  author="Pavel {Rovnaník} and Kristýna {Halasová}",
  title="Thermal behaviour of metakaolin/fly ash geopolymers with chamotte aggregate",
  journal="Materials",
  year="2016",
  volume="2016",
  number="9",
  pages="1--13",
  doi="10.3390/ma9070535",
  issn="1996-1944",
  url="http://www.mdpi.com/1996-1944/9/7/535"
}