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.
Highlights
Geopolymers are inorganic materials with several superior properties which have been intensively studied for the last two decades as alternatives to Portland cement-based materials
The most commonly used aluminosilicates are metakaolin and fly ash from the high-temperature combustion of coal [1,2,3]; in recent years attention is paid to other waste materials, such as rice husk ash [4], palm oil fuel ash [5], municipal solid waste incinerator fly ash [6], or red mud [7], and various natural pozzolans [8,9,10]
Dry samples that were sputtered with carbon. Both the metakaolin and the fly ash geopolymers underwent structural changes when they were. Both thehigh metakaolin and the The fly ash geopolymers underwent structural changes when theywere exposed to very temperatures
Summary
Geopolymers are inorganic materials with several superior properties which have been intensively studied for the last two decades as alternatives to Portland cement-based materials. The presence of kalsilite (KAlSiO4 ) and leucite (KAlSi2 O6 ) have been proven in heat-treated samples of potassium geopolymers [16], while nepheline (NaAlSiO4 ), jadeite (NaAlSi2 O6 ), and albite (NaAlSi3 O8 ) have been observed in Na-based geopolymers [17,18,19]. These minerals are, controlling factors for the fusion of geopolymer
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