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Title: Theoretical investigation of C-(A)-S-H(I) cement hydrates

Journal Article · · Construction and Building Materials

The atomic-level understanding of the correlation of chemical, electronic and bonding behavior to mechanical properties of complex multi-component calcium (alumino)silicate hydrates [C-(A)-S-H] (The Cement Chemist Notation heavily used in this manuscript refers to C=CaO; A=Al2O3; S=SiO2; H=H2O or –OH), which is among the main binding phases of concrete could provide a point of departure for the study of cement behavior. In this paper, models of highly ordered C-(A)-S-H(I) are proposed and investigated. These models have been optimized and constructed in close relation and guidance of relevant experiments. The focus of the work is on illuminating the effect of Al substitution on chemical and mechanical properties of highly ordered synthetic cement phases. Furthermore, we show the importance of hydrogen bonds to mechanical properties in cements. We show, for the first time, that in the absence of vacancies in Dreierketten chains, the Al substitution in bridging sites reduces the mechanical anisotropy of C-(A)-S-H(I) cement. The study also shows the average partial charge of O, H, Si of different structural units are effectively independent of the chemical environment. This finding could have profound implications upon relevant classical molecular dynamics force fields for cements and could lead to further improvements in the modeling capabilities.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC); University of Missouri, Kansas City, MO (United States)
Sponsoring Organization:
USDOE Office of Science (SC); National Science Foundation (NSF)
Grant/Contract Number:
AC03-76SF00098; CMMI-1068528
OSTI ID:
1543532
Alternate ID(s):
OSTI ID: 1702856
Journal Information:
Construction and Building Materials, Vol. 184, Issue C; ISSN 0950-0618
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 13 works
Citation information provided by
Web of Science

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Cited By (1)

Hydration and Microstructure of Cement Pastes with Calcined Hwangtoh Clay journal February 2019