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Calcined clays as supplementary cementitious materials: A comparison between palygorskite and kaolinite
https://orcid.org/0000-0001-5057-3905
https://orcid.org/0000-0002-8671-0630
https://orcid.org/0000-0003-3332-7424
Abstract This study aims at investigating the potential as SCM of palygorskite by comparison of calcination and reactivity with kaolinite. The physico-chemical modifications after calcination were investigated by XRD, 27Al and 29Si MAS NMR analyses, then the reactivity study and mechanical performance measurements were assessed. The results detailed that palygorskite behaves quite differently from kaolinite during calcination. Dehydroxylation kinetics is longer and gradual dehydroxylation is observed for palygorkiste and associated with progessive evolution of Al and Si environment leading to the formation of silica-rich aluminium-poor domains. The study showed a significant increase of mechanical performance on pastes incorporating only 10 % of calcined palygorskite in comparison to the reference which indicates that calcined palygorskite can be a suitable SCM once calcined.
Highlights This paper assesses the suitability of palygorskite for use as an SCM. The calcination of palygorskite and the microstructural transformations are described and compared with calcined kaolinite. Palygorskite dehydroxylates gradually upon calcination whereas kaolinite has a much more abrupt dehydroxylation. Calcined palygorskite exhibits high pozzolanic activity and allows an increase in compressive strength of the material. Calcined palygorskite can be a promising SCM to consider in blended cement.
Calcined clays as supplementary cementitious materials: A comparison between palygorskite and kaolinite
https://orcid.org/0000-0001-5057-3905
https://orcid.org/0000-0002-8671-0630
https://orcid.org/0000-0003-3332-7424
Abstract This study aims at investigating the potential as SCM of palygorskite by comparison of calcination and reactivity with kaolinite. The physico-chemical modifications after calcination were investigated by XRD, 27Al and 29Si MAS NMR analyses, then the reactivity study and mechanical performance measurements were assessed. The results detailed that palygorskite behaves quite differently from kaolinite during calcination. Dehydroxylation kinetics is longer and gradual dehydroxylation is observed for palygorkiste and associated with progessive evolution of Al and Si environment leading to the formation of silica-rich aluminium-poor domains. The study showed a significant increase of mechanical performance on pastes incorporating only 10 % of calcined palygorskite in comparison to the reference which indicates that calcined palygorskite can be a suitable SCM once calcined.
Highlights This paper assesses the suitability of palygorskite for use as an SCM. The calcination of palygorskite and the microstructural transformations are described and compared with calcined kaolinite. Palygorskite dehydroxylates gradually upon calcination whereas kaolinite has a much more abrupt dehydroxylation. Calcined palygorskite exhibits high pozzolanic activity and allows an increase in compressive strength of the material. Calcined palygorskite can be a promising SCM to consider in blended cement.
Calcined clays as supplementary cementitious materials: A comparison between palygorskite and kaolinite
https://orcid.org/0000-0001-5057-3905
https://orcid.org/0000-0002-8671-0630
https://orcid.org/0000-0003-3332-7424
Abstract This study aims at investigating the potential as SCM of palygorskite by comparison of calcination and reactivity with kaolinite. The physico-chemical modifications after calcination were investigated by XRD, 27Al and 29Si MAS NMR analyses, then the reactivity study and mechanical performance measurements were assessed. The results detailed that palygorskite behaves quite differently from kaolinite during calcination. Dehydroxylation kinetics is longer and gradual dehydroxylation is observed for palygorkiste and associated with progessive evolution of Al and Si environment leading to the formation of silica-rich aluminium-poor domains. The study showed a significant increase of mechanical performance on pastes incorporating only 10 % of calcined palygorskite in comparison to the reference which indicates that calcined palygorskite can be a suitable SCM once calcined.
Highlights This paper assesses the suitability of palygorskite for use as an SCM. The calcination of palygorskite and the microstructural transformations are described and compared with calcined kaolinite. Palygorskite dehydroxylates gradually upon calcination whereas kaolinite has a much more abrupt dehydroxylation. Calcined palygorskite exhibits high pozzolanic activity and allows an increase in compressive strength of the material. Calcined palygorskite can be a promising SCM to consider in blended cement.
Calcined clays as supplementary cementitious materials: A comparison between palygorskite and kaolinite
Poussardin, Victor (author) / Wilson, William (author) / Paris, Michael (author) / Tagnit-Hamou, Arezki (author) / Deneele, Dimitri (author)
2024-01-23
Article (Journal)
Electronic Resource
English
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