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...
Saved in:
Published in | Chemical physics letters Vol. 392; no. 1; pp. 242 - 248 |
---|---|
Main Authors | , , , , |
Format | Journal Article |
Language | English |
Published |
Elsevier B.V
01.07.2004
|
Online Access | Get full text |
Cover
Loading…
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 |