Journal
CEMENT AND CONCRETE RESEARCH
Volume 42, Issue 9, Pages 1225-1232Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.cemconres.2012.05.014
Keywords
Drying (A); Calcium-silicate-hydrate (C-S-H) (B); Mechanical properties (C)
Funding
- National Science Foundation (NSF) [1131369]
- US Defence Threat Reduction Agency (DTRA) scholarship
- Div Of Chem, Bioeng, Env, & Transp Sys
- Directorate For Engineering [0960256] Funding Source: National Science Foundation
- Div Of Civil, Mechanical, & Manufact Inn
- Directorate For Engineering [1131369] Funding Source: National Science Foundation
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In this study, calcium silicate hydrate (C-S-H) is synthesized and characterized. C-S-H slurry was made with calcium oxide (CaO) to micro-silica (SiO2) mixture ratio of 1.5 and enough deionized water. The slurry was continuously mixed for 7 days, then the excess water was removed. Two methods of drying were implemented: one method used the standard d-dry technique and the other was equilibrated to 11% relative humidity (RH). The dried powders were characterized using thermo gravimetric analysis (TGA), X-ray diffraction analysis (XRDA), and Si-29 magic angle spinning (MAS) nuclear magnetic resonance (NMR) spectroscopy. The stoichiometric formulas of synthetic C-S-H powders dried to d-dry and 11% RH in this study were approximated as C1.2SH0.7 and C1.2SH2.4 respectively. The powders were then compacted to create specimens with porosities similar to C-S-H in hydrated cement. The specimens underwent nanoindentation to mechanically characterize C-S-H. The experiments provide insight on the nanoscale mechanical characteristics of C-S-H. (C) 2012 Elsevier Ltd. All rights reserved.
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