Accelerating effects of colloidal nano-silica for beneficial calcium–silicate–hydrate formation in cement

The hydration process of Ca 3SiO 5 (C 3S) cement is investigated, and accelerating effects of adding colloidal silica (CS) are established. CS accelerates dissolution of the C 3S phase, and renders a more rapid formation of the calcium–silicate–hydrate (C–S–H) binding phase. The role of water is dem...

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Published inChemical physics letters Vol. 392; no. 1; pp. 242 - 248
Main Authors Björnström, J, Martinelli, A, Matic, A, Börjesson, L, Panas, I
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.07.2004
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Summary:The hydration process of Ca 3SiO 5 (C 3S) cement is investigated, and accelerating effects of adding colloidal silica (CS) are established. CS accelerates dissolution of the C 3S phase, and renders a more rapid formation of the calcium–silicate–hydrate (C–S–H) binding phase. The role of water is demonstrated. Water evaporation correlates with the appearance of a sharp IR band at 3650 cm −1 signifying non-hydrogen bonded OH groups. Incomplete hydration results in Ca(OH) 2 precipitation. Suppression of water evaporation causes the 3650 cm −1 band to vanish. The Ca 2+ ions become incorporated in the C–S–H network, the formation of which is accelerated by CS.
ISSN:0009-2614
1873-4448
DOI:10.1016/j.cplett.2004.05.071