期刊
CEMENT AND CONCRETE RESEARCH
卷 160, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.cemconres.2022.106921
关键词
Metakaolin-based geopolymers; Single-sided NMR; Geopolymerization; Silica-to-alumina ratio; H-1 relaxation NMR
资金
- University of Oulu Kvantum Institute under Emerging projects program
- Academy of Finland [322085, 321701]
- University of Oulu & The Academy of Finland Profi5 [326291]
- European Research Council [772110]
- H2020 Marie Sklodowska-Curie Actions [896824]
- AURAMO-grant of Finland
- Otto A. Malm Foundation
- Marie Curie Actions (MSCA) [896824] Funding Source: Marie Curie Actions (MSCA)
- European Research Council (ERC) [772110] Funding Source: European Research Council (ERC)
- Academy of Finland (AKA) [321701, 321701, 322085, 322085] Funding Source: Academy of Finland (AKA)
Characterizing and understanding the mechanisms underlying geopolymerization are crucial for the widespread commercial production of sustainable construction material. This study used non-destructive H-1 NMR relaxometry to monitor the curing process of metakaolin-based geopolymers. The results showed that the silica-to-alumina ratio (Si/Al) affects the reaction stages of geopolymerization.
Characterizing and understanding the mechanisms underlying geopolymerization are critical in achieving the use of sustainable construction material, geopolymer, for widespread commercial production. Non-destructive H-1 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 H-1 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.
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