Journal
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
Volume 99, Issue 8, Pages 2778-2785Publisher
WILEY
DOI: 10.1111/jace.14242
Keywords
calcium silicate hydrate; alkaline system; sodium; ion exchange; high alumina fly ash
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Funding
- National Natural Science Foundation of China [51304184]
- Coal Based Key Scientific and Technological Project of Shanxi Province [MC2014-06]
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Synthesis of calcium silicate hydrate (C-S-H) was conducted over the range of 50 degrees C-90 degrees C and C/S ratio of 0.86-2.14 in the highly alkaline Na2O-CaO-SiO2-H2O system for silicon utilization in high alumina fly ash. Structural change in C-S-H formed in the highly alkaline system was investigated using XRD and Si-29 MAS NMR spectra. X-ray photoelectron spectroscopy was used to confirm the amount of sodium ions in C-S-H. Conversion of Si may reach 99% under optimum conditions. A higher degree of polymerization of silicate was obtained at lower temperature and C/S ratio. Na+ was confirmed to exist as Na-OSi and Na-OH. The amount of Na+ is the least at C/S ratio of 1.43, which conform to the prediction of topological constraint theory. High Ca/Si ratio leads to the increasing in Na+ combined in the interlayer. Increasing in the Na+ concentration in the system also increases the amount of Na+ combined in the interlayer and reduces the polymerization. Ion exchange was proven to be an effective way to remove Na+ combined in the interlayer of C-S-H.
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