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oai:recercat.cat:2117/3679862026-01-21T10:07:17Zcom_2072_1033col_2072_452950

Effect of alkalinity on early-age hydration in calcium sulfoaluminate clinker Padilla, Patricio Fernández Carrasco, Lucía Palomo Sanchez, Ángel Fernández Jiménez, Ana Universitat Politècnica de Catalunya. Departament d'Enginyeria Civil i Ambiental Universitat Politècnica de Catalunya. ATEM - Anàlisi i Tecnologia d'Estructures i Materials Àrees temàtiques de la UPC::Edificació::Materials de construcció::Ciment Cement clinkers Cementos de sulfoaluminato de calcio Calcium sulfoaluminate clinker Early hydrations Alkalis Continuous and discontinuous DRX Ciment 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. 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. Peer Reviewed Postprint (author's final draft) 2022-05 Article 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. 0008-8846 https://hdl.handle.net/2117/367986 10.1016/j.cemconres.2022.106781 eng https://www.sciencedirect.com/science/article/pii/S0008884622000722 info:eu-repo/grantAgreement/MINECO//BIA2016-76466-R © 2022. Elsevier https://creativecommons.org/licenses/by-nc-nd/4.0/ Open Access Attribution-NonCommercial-NoDerivatives 4.0 International application/pdf