Soft X-ray Ptychographic Imaging and Morphological Quantification of Calcium Silicate Hydrates (C-S-H)
- Title
- Soft X-ray Ptychographic Imaging and Morphological Quantification of Calcium Silicate Hydrates (C-S-H)
- Author
- 배성철
- Keywords
- PORTLAND-CEMENT; TRICALCIUM SILICATE; PASTE; SCATTERING; MICROSTRUCTURE; MICROSCOPY; SURFACE
- Issue Date
- 2015-09
- Publisher
- WILEY-BLACKWELL
- Citation
- JOURNAL OF THE AMERICAN CERAMIC SOCIETY, v. 98, NO 12, Page. 4090-4095
- Abstract
- Morphological details of calcium silicate hydrate (C-S-H) stemming from the hydration process of Portland cement (PC) phases are crucial for understanding the PC-based systems but are still only partially known. Here we introduce the first soft X-ray ptychographic imaging of tricalcium silicate (C3S) hydration products. The results are compared using both scanning transmission X-ray and electron transmission microscopy data. The evidence shows that ptychography is a powerful method to visualize the details of outer and inner product C-S-H of fully hydrated C3S, which have fibrillar and an interglobular structure with average void sizes of 20 nm, respectively. The high-resolution ptychrography image enables us to perform morphological quantification of C-S-H, and, for the first time, to possibly distinguish the contributions of inner and outer product C-S-H to the small angle scattering of cement paste. The results indicate that the outer product C-S-H is mainly responsible for the q(-3) regime, whereas the inner product C-S-H transitions to a q(-2) regime. Various hypotheses are discussed to explain these regimes.
- URI
- http://onlinelibrary.wiley.com/doi/10.1111/jace.13808/fullhttp://hdl.handle.net/20.500.11754/27396
- ISSN
- 0002-7820; 1551-2916
- DOI
- 10.1111/jace.13808
- Appears in Collections:
- COLLEGE OF ENGINEERING[S](공과대학) > ARCHITECTURAL ENGINEERING(건축공학부) > Articles
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