dc.contributor
Universitat Politècnica de Catalunya. Departament d'Enginyeria Civil i Ambiental
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Universitat Politècnica de Catalunya. ATEM - Anàlisi i Tecnologia d'Estructures i Materials
dc.contributor.author
Padilla, Patricio
dc.contributor.author
Fernández Carrasco, Lucía
dc.contributor.author
Palomo Sanchez, Ángel
dc.contributor.author
Fernández Jiménez, Ana
dc.identifier
Padilla, P. [et al.]. Effect of alkalinity on early-age hydration in calcium sulfoaluminate clinker. "Cement and concrete research", Maig 2022, vol. 155, p. 106781:1-106781:13.
dc.identifier
https://hdl.handle.net/2117/367986
dc.identifier
10.1016/j.cemconres.2022.106781
dc.description.abstract
Early-age hydration with neutral or alkaline (0 M to 8 M) solutions was studied in calcium sulfoaluminate clinker (CSA) using isothermal conduction calorimetry, X-ray diffraction (both continuous and discontinuous, i.e., after detaining hydration with isopropanol) and infrared spectroscopy. Hydration in 0.1 M NaOH was observed to be similar to hydration in water. At the next highest concentration studied (1 M), however, the reaction rate was slower, due primarily to lower AFt stability in that medium. Faster hydration but less total heat was observed in the pastes hydrated with 2 M NaOH, a finding associated with the presence of a metastable compound, U-phase, that subsequently transitioned to AFt, C3AH6 and thenardite. Hydration with highly alkaline (4 M and 8 M) solutions inhibited AFt formation completely, although ye'elimite reacted more vigorously (particularly with 8 M NaOH) to form katoite, AH3 and thenardite.
dc.description.abstract
Funding for this study was provided by the Spanish Ministry of Science, Innovation and Universities and ERDF under project BIA2016-76466-R and grant BES-2017-082022. PhD. student Pilar Padilla-Encinas benefited from the support of the Universidad Autónoma of Madrid to perform the research for her thesis through the IETcc's Applied Chemistry Programme. The cement supplied by HeidelbergCement Hispania is gratefully acknowledged.
dc.description.abstract
Peer Reviewed
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Postprint (author's final draft)
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application/pdf
dc.relation
https://www.sciencedirect.com/science/article/pii/S0008884622000722
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info:eu-repo/grantAgreement/MINECO//BIA2016-76466-R
dc.rights
© 2022. Elsevier
dc.rights
https://creativecommons.org/licenses/by-nc-nd/4.0/
dc.rights
Attribution-NonCommercial-NoDerivatives 4.0 International
dc.subject
Àrees temàtiques de la UPC::Edificació::Materials de construcció::Ciment
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Cement clinkers
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Cementos de sulfoaluminato de calcio
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Calcium sulfoaluminate clinker
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Early hydrations
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Continuous and discontinuous DRX
dc.title
Effect of alkalinity on early-age hydration in calcium sulfoaluminate clinker
