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Atomic and nano-scale characterization of a 50-year-old hydrated C3S paste

Title
Atomic and nano-scale characterization of a 50-year-old hydrated C3S paste
Author
배성철
Keywords
TEM; NMR; Microstructure; Ca3SiO5; STXM
Issue Date
2015-11
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Citation
CEMENT AND CONCRETE RESEARCH, v. 77, Page. 36-46
Abstract
This paper investigates the atomic and nano-scale structures of a 50-year-old hydrated alite paste. Imaged by TEM, the outer product C-S-H fibers are composed of particles that are 1.5-2 nm thick and several tens of nanometers long. Si-29 NMR shows 47.9% Q(1) and 52.1% Q(2), with a mean SiO4 tetrahedron chain length (MCL) of 4.18, indicating a limited degree of polymerization after 50 years' hydration. A Scanning Transmission X-ray Microscopy #STXM# study was conducted on this late-age paste and a 1.5 year old hydrated C3S solution. Near Edge X-ray Absorption Fine Structure #NEXAFS# at Ca L-3,L-2-edge indicates that Ca2+ in C-S-H is in an irregular symmetric coordination, which agrees more with the atomic structure of tobermorite than that of jennite. At Si K-edge, multi-scattering phenomenon is sensitive to the degree of polymerization, which has the potential to unveil the structure of the SiO44- tetrahedron chain. #C# 2015 Elsevier Ltd. All rights reserved.
URI
http://www.sciencedirect.com/science/article/pii/S0008884615001799http://hdl.handle.net/20.500.11754/28939
ISSN
0008-8846; 1873-3948
DOI
10.1016/j.cemconres.2015.06.010
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > ARCHITECTURAL ENGINEERING(건축공학부) > Articles
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