Journal
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
Volume 40, Issue 8, Pages 3314-3326Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2020.02.052
Keywords
Chamotte; AZS; Alkali-activation; Refractory; High-temperature
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Funding
- European project AMITIE [734342]
- Marie Curie Actions (MSCA) [734342] Funding Source: Marie Curie Actions (MSCA)
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The feasibility to prepare alkali-activated materials starting from refractory wastes and their properties after exposure to high temperatures (800, 1000, 1200 and 1400 degrees C) were investigated. Two different aluminosilicate wastes were used: chamotte (CH, mainly composed of corundum, mullite and andalusite) and alumina-zirconia-silica (AZS, composed by baddeleyite, corundum and amorphous silica). Very high mechanical properties were achieved in both cases (28-days compressive strength of approx. 70 and 60 MPa for CH- and AZS-based pastes, respectively). Then, alkali-activated pastes were exposed to high temperatures. For both kinds of samples, a sharp increase of mechanical properties was obtained after exposure to 800 and 1000 degrees C thanks to the matrix densification. Above 1000 degrees C viscous sintering occurs leading to a further increase of mechanical properties. AZS-based materials were able to withstand high temperatures up to 1400 degrees C while CH-based pastes mechanical properties decrease at 1400 degrees C due to andalusite decomposition.
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