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Three-Dimensional Characterization of Hardened Paste of Hydrated Tricalcium Silicate by Serial Block-Face Scanning Electron Microscopy

1
School of Materials Science and Engineering, Tongji University, Shanghai 201804, China
2
Key Laboratory of Advanced Civil Engineering Materials (Tongji University), Ministry of Education, Shanghai 201804, China
3
London Centre for Nanotechnology, University College London, London WC1H 0AH, UK
4
Division of Condensed Matter Physics and Materials Science, Brookhaven National Laboratory, Upton, NY 11973, USA
*
Authors to whom correspondence should be addressed.
Materials 2019, 12(12), 1882; https://doi.org/10.3390/ma12121882
Received: 19 May 2019 / Revised: 31 May 2019 / Accepted: 3 June 2019 / Published: 12 June 2019
(This article belongs to the Section Structure Analysis and Characterization)
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Abstract

With the application of a three-dimensional (3D) characterization technique, serial block-face scanning electron microscopy (SBFSEM), the 3D microstructure of a hydrated cement monomineral, tricalcium silicate (C3S), was measured with nanoscale resolution. The 3D morphologies of anhydrous particles, hydrated products, and capillary pores were visualized. Closed and open pores were discovered inside an anhydrous particle. The size and distribution of both the anhydrous C3S particles and their capillary pores were analyzed quantitatively and the porosity was determined to be 9%. The distribution of pores was found to be in a good agreement with the inner and outer product model of Hu et. al., with an inner shell distance of 860 nm. Considering the spatial resolution of the instrument and the volume of sample measured, most pores in this experiment could be characterized as capillary pores. View Full-Text
Keywords: tricalcium silicate (C3S); hydration; 3D microstructure; serial block-face scanning electron microscopy (SBFSEM) tricalcium silicate (C3S); hydration; 3D microstructure; serial block-face scanning electron microscopy (SBFSEM)
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Zhao, Y.; Liu, X.; Chen, B.; Yang, F.; Zhang, Y.; Wang, P.; Robinson, I. Three-Dimensional Characterization of Hardened Paste of Hydrated Tricalcium Silicate by Serial Block-Face Scanning Electron Microscopy. Materials 2019, 12, 1882.

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