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Materials 2016, 9(7), 535; doi:10.3390/ma9070535

Thermal Behaviour of Metakaolin/Fly Ash Geopolymers with Chamotte Aggregate

Faculty of Civil Engineering, Brno University of Technology, Veveří 95, Brno 602 00, Czech Republic
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Academic Editor: Arie van Riessen
Received: 9 May 2016 / Revised: 21 June 2016 / Accepted: 23 June 2016 / Published: 30 June 2016
(This article belongs to the Special Issue Advances in Geopolymers and Alkali-Activated Materials)
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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 to 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. View Full-Text
Keywords: geopolymer; fly ash; metakaolin; high temperatures; chamotte; microstructure geopolymer; fly ash; metakaolin; high temperatures; chamotte; microstructure
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Rovnaník, P.; Šafránková, K. Thermal Behaviour of Metakaolin/Fly Ash Geopolymers with Chamotte Aggregate. Materials 2016, 9, 535.

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