Hostname: page-component-cd9895bd7-dzt6s Total loading time: 0 Render date: 2024-12-27T01:38:14.864Z Has data issue: false hasContentIssue false
  • English
  • Français

Mechanism of Orientation of Ca(OH)2 Crystals in Interface Layer Between Paste and Aggregate in Systems Containing Silica Fume

Published online by Cambridge University Press:  21 February 2011

Wang Jia
Wang Jia*
Affiliation:
Division of Building Materials, Department of Civil Engineering, Tsinghua University, Beijing, China
Get access

Abstract

Factors such as the type of aggregate, the addition of silica fume, and the roughness of the aggregate surface, which influence the orientation index of Ca(OH)2 crystals in the interface layer, are discussed, based on the experimental results of Maso [3] and the author. Then, a hypothesis about the mechanism of this orientation is proposed, involving the Ca(OH)2 crystal structure and the principles of physical chemistry of surfaces.

From this hypothesis, it is suggested that the reduction of the orientation index of Ca(OH)2 crystals when silica fume is added is due to physical aspects other than the large water requirement of silica fume. The same is also true when the aggregate surface is rough.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 114: Symposium R – Bonding in Cementitious Composites , 1987 , 127
Copyright
Copyright © Materials Research Society 1988

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

1. Buck, A.D. and Dolch, W.L., J. Am. Concrete Inst. 63 [7], 755 (1966).Google Scholar
2. Ollivier, J.P. and Grandet, J., 7th Int. Congr. on Chem. of Cement, Paris, 3, VII–85 (1980).Google Scholar
3. Maso, J.C., 7th Int. Congr. on Chem. of Cement, Paris, 1, VII–1/3 (1980).Google Scholar
4. Harkins, W.D., Journal of Chemical Surface, 10, 286 (1942).Google Scholar
5. Gongdu, Zhou, Chemistry of Inorganic Structure, 1st ed. (Science Publishing House, Beijing, 1982), p. 397 (Chinese).Google Scholar
6. Chemistry Department of Beijing University, Chemistry of Interface, 1980 (unpublished, Chinese).Google Scholar
7. Materials Department of Zhejiang University, Thermodynamics of Surface and Interface, 1984 (unpublished, Chinese).Google Scholar