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A method for the reliable and reproducible precipitation of phase pure high Ca/Si ratio (>1.5) synthetic calcium silicate hydrates (C S H)

Cement and Concrete Research, ISSN: 0008-8846, Vol: 151, Page: 106623
2022
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Article Description

Various methods have been developed to synthesize C S H; however, these methods have only allowed for the successful production of pure-phase C S H with Ca:Si of 1.5 or less. Attempts to form higher Ca:Si ratios by these methods gives C S H (Ca:Si 1.5 or less) in the presence of Ca(OH) 2. This paper focuses on a reliable method to produce single-phase C S H with Ca:Si molar ratios between 1 and 2. Reactant concentrations, temperature, pH, and mixing conditions are carefully controlled to ensure homogeneous precipitation of C S H. Guidelines on collection, drying, storage, and handling are also described.

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