Longitudinal single-sided NMR study : silica-to-alumina ratio changes the reaction mechanism of geopolymer |
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Author: | Li, Jing1,2; Mailhiot, Sarah2; Kantola, Anu M.2; |
Organizations: |
1Fibre and Particle Engineering Research Unit, Faculty of Technology, University of Oulu, P.O. Box 4300, FIN-90014 Oulu, Finland 2NMR Research Unit, Faculty of Science, University of Oulu, P.O. Box 3000, FIN-90014 Oulu, Finland |
Format: | article |
Version: | published version |
Access: | open |
Online Access: | PDF Full Text (PDF, 1.5 MB) |
Persistent link: | http://urn.fi/urn:nbn:fi-fe2022102462935 |
Language: | English |
Published: |
Elsevier,
2022
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Publish Date: | 2022-10-24 |
Description: |
AbstractCharacterizing and understanding the mechanisms underlying geopolymerization are critical in achieving the use of sustainable construction material, geopolymer, for widespread commercial production. Non-destructive ¹H NMR relaxometry can provide novel information about geopolymerization as it allows simultaneous detection of where the water goes and how the pore structure changes. Coupled with the development of single-sided NMR devices, NMR measurements are not limited by the specimen size and are therefore able to observe in-situ conditions of geopolymer synthesis. Here, the curing process of metakaolin-based geopolymers was monitored by ¹H relaxometry on a single-sided NMR device. The silica-to-alumina ratio (Si/Al) was found to affect reaction stages of the geopolymerization. After the dissolution of aluminosilicate precursor, the low Si/Al of 1 was found to generate three gelation/polymerization stages as well as a water-binding stage, and two gel phases appeared. When Si/Al varied in 1.5–2.5, two gelation/polymerization stages and only one gel phase was observed. see all
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Series: |
Cement and concrete research |
ISSN: | 0008-8846 |
ISSN-E: | 1873-3948 |
ISSN-L: | 0008-8846 |
Volume: | 160 |
Article number: | 106921 |
DOI: | 10.1016/j.cemconres.2022.106921 |
OADOI: | https://oadoi.org/10.1016/j.cemconres.2022.106921 |
Type of Publication: |
A1 Journal article – refereed |
Field of Science: |
216 Materials engineering |
Subjects: | |
Funding: |
This work is funded by the University of Oulu Kvantum Institute under Emerging projects program (Zero-CO2 cement concept via phase-separated nano-glass). P.K. acknowledges financial support from Academy of Finland (grant 322085) as well as the University of Oulu & The Academy of Finland Profi5 (326291). V.-V.T. acknowledges financial support from the European Research Council (project number 772110). S.M. acknowledges financial support from Academy of Finland (grant no. 321701) and H2020 Marie Skłodowska-Curie Actions (grant no. 896824). J.L. acknowledges financial support from AURAMO-grant of Finland and Otto A. Malm Foundation. |
EU Grant Number: |
(896824) NMRCement - Zero-CO2 cement concept evaluated with novel Nuclear Magnetic Resonance (NMR) (772110) UFLNMR - Ultrafast Laplace NMR |
Academy of Finland Grant Number: |
322085 321701 |
Detailed Information: |
322085 (Academy of Finland Funding decision) 321701 (Academy of Finland Funding decision) |
Copyright information: |
© 2022 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). |
https://creativecommons.org/licenses/by/4.0/ |