Abstract
In this work, an unconventional method for calcium silicate hydrate synthesis combining utilization of silica gel waste and immobilization of F− ions in formed products, during hydrothermal treatment, was presented. The hydrothermal synthesis of calcium silicate hydrates was performed for 4, 8, 16, 24, 48 and 72 h at 200 °C when the molar ratio of the primary CaO/SiO2 mixtures was 0.83. It was estimated that F− ions were bound into a calcium fluoride during hydrothermal synthesis, because the concentration of these ions in the synthesis solution was not higher than 10 ppm. It was determined that the mechanism of hydrothermal reactions and the sequence of the compounds formed in CaO–silica gel waste–H2O mixtures are quite different from that in pure mixtures because part of the CaO reacts with F− and Al3+ ions and forms calcium fluoride and hydrogarnet, respectively. The obtained results were confirmed by the thermodynamic calculations and instrumental analysis data.
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This research was funded by a Grant (No. MIP—025/2014) from the Research Council of Lithuania.
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Baltakys, K., Iljina, A. & Bankauskaite, A. Thermal properties and application of silica gel waste contaminated with F− ions for C-S-H synthesis. J Therm Anal Calorim 121, 145–154 (2015). https://doi.org/10.1007/s10973-015-4663-4
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DOI: https://doi.org/10.1007/s10973-015-4663-4