Relaxation characteristics and state evolution of water during the early-age reaction of alkali-activated slag as monitored by low field nuclear magnetic resonance
Article
Article Title | Relaxation characteristics and state evolution of water during the early-age reaction of alkali-activated slag as monitored by low field nuclear magnetic resonance |
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ERA Journal ID | 4883 |
Article Category | Article |
Authors | Cao, Ruilin, Zhang, Zuhua, Zhang, Yamei and Banthia, Nemkumar |
Editors | Zhang, Yamei |
Journal Title | Composites Part B: Engineering |
Journal Citation | Banthia, Nemkumar, pp. 1-10 |
Article Number | 110025 |
Number of Pages | 10 |
Year | 2022 |
Publisher | Elsevier |
Place of Publication | United Kingdom |
ISSN | 1359-8368 |
Digital Object Identifier (DOI) | https://doi.org/10.1016/j.compositesb.2022.110025 |
Web Address (URL) | https://www.sciencedirect.com/science/article/pii/S1359836822004024 |
Abstract | Low field nuclear magnetic resonance (LF-NMR) was used to monitor the evolution characteristics of transverse relaxation time (T2) of the water in sodium hydroxide (SH) and sodium silicate (SS) activated slag pastes. According to the T2 weighted average value evolution curve, the early-age reaction process of SH-activated system could be divided into three typical stages: initial setting stage (I), acceleration stage (II) and deceleration stage (III). However, another two distinguishable stages including the second acceleration stage (Ⅳ) and the second deceleration stage (Ⅴ) could be identified in SS-activated system. The essential reactions in different reaction stages of the two types of alkali-activated pastes were discussed. The obtained relaxation signals were employed to determine the chemically bound water content in different alkali-activated slag (AAS) pastes at specific reaction stages, as well as the dynamic change of the relative contents of gel water, capillary water and free water with reaction time. The influence mechanism of the initial active SiO44− oligomer in activator solution on the early-age reaction of AAS was revealed. A distinct water release behavior was observed in the geopolymerization process at the acceleration stages of each AAS paste. |
Keywords | Alkali-activated slag; Early-age reaction process; Low-field nuclear magnetic resonance; Relaxation characteristic; Water transformation |
ANZSRC Field of Research 2020 | 4016. Materials engineering |
Public Notes | Files associated with this item cannot be displayed due to copyright restrictions. |
Funder | National Natural Science Foundation of China |
Byline Affiliations | Southeast University, China |
Hunan University, China | |
University of British Columbia, Canada | |
Library Services |
https://research.usq.edu.au/item/yy42y/relaxation-characteristics-and-state-evolution-of-water-during-the-early-age-reaction-of-alkali-activated-slag-as-monitored-by-low-field-nuclear-magnetic-resonance
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