Microstructural Study of Hydration of C3S in the Presence of Calcium Nitrate Using Scanning Transmission X-Ray Microscopy (STXM)

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Calcium nitrate (CN) is used widely as an effectively inorganic setting accelerator and antifreeze admixture in concrete structures. In this paper, the multiscale investigation of CN on the hydration of C3S was studied by scanning transmission X-ray microscopy (STXM) combined with near-edge X-ray absorption fine structure (NEXAFS), Si-29 MAS NMR, calorimetry, scanning electron microscope, and N-2 absorption. It was concluded that the calcium silicate hydrate (C-S-H) surrounds the unhydrated C3S at 1-day hydrated C3S in the presence of calcium nitrate, while portlandite is partly in transformation and is formed partly. Based on Ca L3,2-edge NEXAFS spectra for 1-day hydrated C3S particle, calcium nitrate does not change the structure of the asymmetrically 7-fold coordination of calcium in the C-S-H. Calcium nitrate can accelerate the hydration of C3S to some extent and polymerization of the silicate chains within C-S-H considerably at early age, resulting in the increasing specific surface area.
Publisher
HINDAWI LTD
Issue Date
2020-04
Language
English
Article Type
Article
Citation

JOURNAL OF NANOMATERIALS, v.2020

ISSN
1687-4110
DOI
10.1155/2020/8419130
URI
http://hdl.handle.net/10203/274328
Appears in Collection
CE-Journal Papers(저널논문)
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