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- W2026552555 abstract "C-S-H samples were precipitated from aqueous solution containing Ca(NO 3 ) 2 and Na 2 SiO 3 with an initial Ca/Si molar ratio of 1·3, when the pH value in the solution was varied by adding HNO 3 or NaOH. A pH > 10·9 was required to obtain quasi-crystalline C-S-H, and the CaO/SiO 2 ratio of the precipitate was increased with increasing pH, reaching a maximum close to the initial ratio at pH > 13. C-S-H was also precipitated with varying initial Ca/Si molar ratios at pH > 13. It was shown that the CaO/SiO 2 ratios can be controlled by either varying the pH value at given initial Ca/Si ratios, or by varying the initial Ca/Si ratios at pH > 13. The C-S-H samples were investigated using X-ray diffraction and 29 Si nuclear magnetic resonance spectroscopy, which identifies the connectivity of silica tetrahedra (Q x ). The interlayer spacing decreased linearly, and Q 1 /(Q 1 + Q 2 + Q 3 ) ratios increased with increasing CaO/SiO 2 ratios. A good correlation between Q 1 /(Q 1 + Q 2 + Q 3 ) ratios and interlayer spacing was observed." @default.
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- W2026552555 date "2000-01-01" @default.
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- W2026552555 title "Effects of pH on precipitation of quasi-crystalline calcium silicate hydrate in aqueous solution" @default.
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- W2026552555 doi "https://doi.org/10.1680/adcr.2000.12.1.29" @default.
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