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dc.contributor.author배성철-
dc.date.accessioned2017-09-06T05:07:34Z-
dc.date.available2017-09-06T05:07:34Z-
dc.date.issued2015-11-
dc.identifier.citationCEMENT AND CONCRETE RESEARCH, v. 77, Page. 36-46en_US
dc.identifier.issn0008-8846-
dc.identifier.issn1873-3948-
dc.identifier.urihttp://www.sciencedirect.com/science/article/pii/S0008884615001799-
dc.identifier.urihttp://hdl.handle.net/20.500.11754/28939-
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. 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.en_US
dc.description.sponsorshipGuoqing GENG's study and research in UC Berkeley are supported by the China Scholarship Council (file No. 201206090127). The authors thank Timothy Teague for the technical help with the SEM and XRD experiments. This research is funded by the National Research Foundation-Prime Minister's office, Republic of Singapore through a grant to the Berkeley Education Alliance for Research in Singapore (BEARS) for the Singapore-Berkeley Building Efficiency and Sustainability in the Tropics (SinBerBEST) Program. BEARS has been established by the University of California, Berkeley as a center for intellectual excellence in research and education in Singapore. The Advanced Light Source is supported by the Director, Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231.en_US
dc.language.isoenen_US
dc.publisherPERGAMON-ELSEVIER SCIENCE LTDen_US
dc.subjectTEMen_US
dc.subjectNMRen_US
dc.subjectMicrostructureen_US
dc.subjectCa3SiO5en_US
dc.subjectSTXMen_US
dc.titleAtomic and nano-scale characterization of a 50-year-old hydrated C3S pasteen_US
dc.typeArticleen_US
dc.relation.volume77-
dc.identifier.doi10.1016/j.cemconres.2015.06.010-
dc.relation.page36-46-
dc.relation.journalCEMENT AND CONCRETE RESEARCH-
dc.contributor.googleauthorGeng, Guoqing-
dc.contributor.googleauthorTaylor, Rae-
dc.contributor.googleauthorBae, Sungchul-
dc.contributor.googleauthorHernandez-Cruz, Daniel-
dc.contributor.googleauthorKilcoyne, David A.-
dc.contributor.googleauthorEmwas, Abdul-Hamid-
dc.contributor.googleauthorMonteiro, Paulo J. M.-
dc.relation.code2015000266-
dc.sector.campusS-
dc.sector.daehakCOLLEGE OF ENGINEERING[S]-
dc.sector.departmentDEPARTMENT OF ARCHITECTURAL ENGINEERING-
dc.identifier.pidsbae-
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > ARCHITECTURAL ENGINEERING(건축공학부) > Articles
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