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A platform for research: civil engineering, architecture and urbanism
Reactivity of flash-calcined illitic clays
Abstract The paper discusses the reactivity of flash-calcined illitic clays for application as an alternative source of supplementary cementitious material. Structural and morphological changes induced by flash calcination improved the illitic clay reactivity despite the incomplete illite dehydroxylation and particle agglomeration. Performance indexes higher than 90%, lime consumption between 554 and 741mgCa(OH)2/g, and the electrical conductivity response ratified the pozzolanic activity. The unique properties achieved by flash-calcination, especially for particles with D90 35 µm submitted to 970 °C in the flash-calcining facility pre-heating, contribute to broadening the calcined clay spectrum for application as supplementary cementitious material, currently dominated by kaolinitic clay.
Highlights Supplementary cementitious material production from unreactive illitic clay. Reactivity improvement by thermal shock and explosive removal of hydroxyl groups. Breakdown of strong bonds and remarkable morphological changes upon flash calcining.
Reactivity of flash-calcined illitic clays
Abstract The paper discusses the reactivity of flash-calcined illitic clays for application as an alternative source of supplementary cementitious material. Structural and morphological changes induced by flash calcination improved the illitic clay reactivity despite the incomplete illite dehydroxylation and particle agglomeration. Performance indexes higher than 90%, lime consumption between 554 and 741mgCa(OH)2/g, and the electrical conductivity response ratified the pozzolanic activity. The unique properties achieved by flash-calcination, especially for particles with D90 35 µm submitted to 970 °C in the flash-calcining facility pre-heating, contribute to broadening the calcined clay spectrum for application as supplementary cementitious material, currently dominated by kaolinitic clay.
Highlights Supplementary cementitious material production from unreactive illitic clay. Reactivity improvement by thermal shock and explosive removal of hydroxyl groups. Breakdown of strong bonds and remarkable morphological changes upon flash calcining.
Reactivity of flash-calcined illitic clays
Rodrigues, G.G.O. (author) / Rohden, A.B. (author) / Wiggers, V.R. (author) / Garcez, M.R. (author)
2023-12-11
Article (Journal)
Electronic Resource
English
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