Microstructural Study of Hydration of C 3 S in the Presence of Calcium Nitrate Using Scanning Transmission X-Ray Microscopy (STXM)
- Shandong Provincial Key Laboratory of Preparation and Measurement of Building Materials, University of Jinan, Jinan, China, State Key Laboratory of Green Building Materials, Beijing, China, Department of Materials Science and Engineering, University of Jinan, Jinan, China
- Shandong Provincial Key Laboratory of Preparation and Measurement of Building Materials, University of Jinan, Jinan, China
- Paul Scherrer Institute, Villigen, Switzerland
- Shandong Provincial Key Laboratory of Preparation and Measurement of Building Materials, University of Jinan, Jinan, China, Department of Materials Science and Engineering, University of Jinan, Jinan, China
- Department of Civil and Environment Engineering, University of California, Berkeley, USA
- Department of Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology, Republic of Korea
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 C 3 S was studied by scanning transmission X-ray microscopy (STXM) combined with near-edge X-ray absorption fine structure (NEXAFS), 29 Si MAS NMR, calorimetry, scanning electron microscope, and N 2 absorption. It was concluded that the calcium silicate hydrate (C-S-H) surrounds the unhydrated C 3 S at 1-day hydrated C 3 S in the presence of calcium nitrate, while portlandite is partly in transformation and is formed partly. Based on Ca -edge NEXAFS spectra for 1-day hydrated C 3 S 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 C 3 S to some extent and polymerization of the silicate chains within C-S-H considerably at early age, resulting in the increasing specific surface area.
- Sponsoring Organization:
- USDOE
- Grant/Contract Number:
- AC02-05CH11231; 2019KJA017; D17001
- OSTI ID:
- 1615716
- Journal Information:
- Journal of Nanomaterials, Journal Name: Journal of Nanomaterials Vol. 2020; ISSN 1687-4110
- Publisher:
- Hindawi Publishing CorporationCopyright Statement
- Country of Publication:
- Egypt
- Language:
- English
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