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Title: | On the retardation mechanisms of citric acid in ettringite-based binders | Authors: | Hoang Nguyen Kunther, Wolfgang GIJBELS, Katrijn SAMYN, Pieter Carvelli, Valter Illikainen, Mirja Kinnunen, Paivo |
Issue Date: | 2021 | Publisher: | PERGAMON-ELSEVIER SCIENCE LTD | Source: | Cement and concrete research (Print), 140 (Art N° 106315) | Abstract: | This study aims to obtain insights into the retardation mechanism of citric acid in an ettringite-based binder from ladle slag and gypsum. The hydration kinetics and phase assemblage of the binder were experimentally investigated and thermodynamically modelled. Additionally, the effects of citric acid on synthetic ettringite were studied to obtain further understanding of the interaction between this organic ligand and the crystal. Experimental results reveal that citric acid works as an inhibitor of ettringite's formation leading to the precipitation of monosulfate and gypsum; the ettringite surface blockage by citrate ligand effectively prevents precipitation of this crystal. This leads to an overestimation in the precipitation of ettringite in the thermodynamic model due to this kinetic barrier imposed by the ligand. Thermodynamic modelling suggests ettringite, monosulfate, aluminum hydroxide, and stratlingite as main hydrates in this binder, whereas an intermixed C-(A-)S-H gel was observed experimentally instead of stratlingite. | Notes: | Nguyen, H (corresponding author), Univ Oulu, Fibre & Particle Engn Res Unit, Pentti Kaiteran Katu 1, Oulu 90014, Finland. hoang.nguyen@oulu.fi; wolku@byg.dtu.dk; katrijn.gijbels@uhasselt.be; pieter.samyn@uhasselt.be; valter.carvelli@polimi.it; mirja.illikainen@oulu.fi; paivo.kinnunen@oulu.fi |
Other: | Nguyen, H (corresponding author), Univ Oulu, Fibre & Particle Engn Res Unit, Pentti Kaiteran Katu 1, Oulu 90014, Finland. hoang.nguyen@oulu.fi; wolku@byg.dtu.dk; katrijn.gijbels@uhasselt.be; pieter.samyn@uhasselt.be; valter.carvelli@polimi.it; mirja.illikainen@oulu.fi; paivo.kinnunen@oulu.fi | Keywords: | Hydration;Retardation;Thermodynamic calculations;Ettringite;Monosulfate | Document URI: | http://hdl.handle.net/1942/33495 | ISSN: | 0008-8846 | e-ISSN: | 1873-3948 | DOI: | 10.1016/j.cemconres.2020.106315 | ISI #: | WOS:000608762600026 | Rights: | 2020 The Author(s). Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license | Category: | A1 | Type: | Journal Contribution | Validations: | ecoom 2022 |
Appears in Collections: | Research publications |
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File | Description | Size | Format | |
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1-s2.0-S0008884620315957-main.pdf | Published version | 10.4 MB | Adobe PDF | View/Open |
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