Abstract
17O and 29Si MAS and CPMAS NMR spectroscopy has been used to study the mechanism of hydration of β– C 2 S and the structure of calcium silicate hydrates (CSH) formed both during hydration of β– C 2 S and synthesized separately. β– C 2 S was reacted with H 2 17 O at room temperature for up to 100 days. Synthesized CSH was made from silica gel and CaCl 2 solution made with H 2 17 O. All the 17O NMR signal from the reaction products is from 17O originally in the water. The local oxygen environments detected in CSH are SiOCa, Ca OH and possibly SiOH. CaOH sites are also present in Ca( OH) 2 accompanying the CSH. The hydration mechanism and CSH structure are discussed.
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