University of Oulu

Hoang Nguyen, Hellen Santos, Harisankar Sreenivasan, Wolfgang Kunther, Valter Carvelli, Mirja Illikainen, Paivo Kinnunen, On the carbonation of brucite: Effects of Mg-acetate on the precipitation of hydrated magnesium carbonates in aqueous environment, Cement and Concrete Research, Volume 153, 2022, 106696, ISSN 0008-8846, https://doi.org/10.1016/j.cemconres.2021.106696

On the carbonation of brucite : effects of Mg-acetate on the precipitation of hydrated magnesium carbonates in aqueous environment

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Author: Nguyen, Hoang1; Santos, Hellen1; Sreenivasan, Harisankar1;
Organizations: 1Fibre and Particle Engineering Research Unit, University of Oulu, Pentti Kaiteran katu 1, 90014 Oulu, Finland
2Department of Civil Engineering, Technical University of Denmark, 2800 Kgs. Lyngby, Denmark
3Department A.B.C., Politecnico di Milano, Piazza Leonardo Da Vinci 32, 20133 Milan, Italy
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 5 MB)
Persistent link: http://urn.fi/urn:nbn:fi-fe202201041137
Language: English
Published: Elsevier, 2021
Publish Date: 2022-01-04
Description:

Abstract

The role of organic ligands on the formation of hydrated magnesium carbonates (HMCs) has been remaining unclear. This work reports insights into the effects of Mg-acetate on the carbonation of brucite including the kinetics of reaction, the precipitation of different HMCs, and reaction mechanisms. We found that the organic ligand increases the kinetics of brucite's carbonation and alter the formation and conversion of HMCs. A relatively unknown phase (i.e., giorgiosite) precipitates in the presence of Mg-acetate with nanowire morphology. With the presence of acetate ligand, nucleation sites formed after the breakdown of Mg-acetate complexes and be replaced by the Mg–CO₃ bonds. These sites act as a sink for Mg²⁺ to grow crystals and prevent the passivation layer of HMCs on brucite's surface. Findings reported here can enable an approach to steer pore solution chemistry in the HMC-based binder for better reaction degree, durability, and mechanical properties.

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Series: Cement and concrete research
ISSN: 0008-8846
ISSN-E: 1873-3948
ISSN-L: 0008-8846
Volume: 153
Article number: 106696
DOI: 10.1016/j.cemconres.2021.106696
OADOI: https://oadoi.org/10.1016/j.cemconres.2021.106696
Type of Publication: A1 Journal article – refereed
Field of Science: 116 Chemical sciences
212 Civil and construction engineering
215 Chemical engineering
216 Materials engineering
Subjects:
Funding: P.K. and H.N. are grateful for the financial support from the University of Oulu & The Academy of Finland Profi5 326291, as well as the Academy of Finland project 329477.
Copyright information: © 2021 The Author(s). Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
  https://creativecommons.org/licenses/by-nc-nd/4.0/