Thermal Behaviour of Metakaolin/Fly Ash Geopolymers with Chamotte Aggregate

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 precur...

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Bibliographic Details
Published in:Materials 2016-06, Vol.9 (7), p.535-535
Main Authors: Rovnaník, Pavel, Safrankova, Kristýna
Format: Article
Language:English
Subjects:
Aggregates
Aluminum silicates
Chamotte
Civil engineering
Coal
Composite materials
Contact
Fly ash
Heat treatment
Heating
Mechanical properties
Particle size
Quartz
Strength
Temperature
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Summary: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.
ISSN:1996-1944
1996-1944
DOI:10.3390/ma9070535