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

Handle URI:
http://hdl.handle.net/10754/566075
Title:
Atomic and nano-scale characterization of a 50-year-old hydrated C3S paste
Authors:
Geng, Guoqing; Taylor, Rae; Bae, Sungchul; Hernández-Cruz, Daniel; Kilcoyne, David A.; Emwas, Abdul-Hamid M.; Monteiro, Paulo J M
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. 29Si NMR shows 47.9% Q1 and 52.1% Q2, 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 L3,2-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. © 2015 Elsevier Ltd. All rights reserved.
KAUST Department:
Advanced Nanofabrication, Imaging and Characterization Core Lab
Publisher:
Elsevier BV
Journal:
Cement and Concrete Research
Issue Date:
15-Jul-2015
DOI:
10.1016/j.cemconres.2015.06.010
Type:
Article
ISSN:
0008-8846
Appears in Collections:
Articles; Advanced Nanofabrication, Imaging and Characterization Core Lab

Full metadata record

DC FieldValue Language
dc.contributor.authorGeng, Guoqingen
dc.contributor.authorTaylor, Raeen
dc.contributor.authorBae, Sungchulen
dc.contributor.authorHernández-Cruz, Danielen
dc.contributor.authorKilcoyne, David A.en
dc.contributor.authorEmwas, Abdul-Hamid M.en
dc.contributor.authorMonteiro, Paulo J Men
dc.date.accessioned2015-08-12T09:27:11Zen
dc.date.available2015-08-12T09:27:11Zen
dc.date.issued2015-07-15en
dc.identifier.issn0008-8846en
dc.identifier.doi10.1016/j.cemconres.2015.06.010en
dc.identifier.urihttp://hdl.handle.net/10754/566075en
dc.description.abstractThis 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. 29Si NMR shows 47.9% Q1 and 52.1% Q2, 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 L3,2-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. © 2015 Elsevier Ltd. All rights reserved.en
dc.publisherElsevier BVen
dc.subjectCa<inf>3</inf>SiO<inf>5</inf> (D)en
dc.subjectMicrostructureen
dc.subjectNMRen
dc.subjectSTXMen
dc.subjectTEM (B)en
dc.titleAtomic and nano-scale characterization of a 50-year-old hydrated C3S pasteen
dc.typeArticleen
dc.contributor.departmentAdvanced Nanofabrication, Imaging and Characterization Core Laben
dc.identifier.journalCement and Concrete Researchen
kaust.authorEmwas, Abdul-Hamid M.en
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