Hostname: page-component-8448b6f56d-gtxcr Total loading time: 0 Render date: 2024-04-24T02:04:09.175Z Has data issue: false hasContentIssue false
  • English
  • Français

A Study of Tricalcium Silicate Hydration from Very Early to Very Late Stages

Published online by Cambridge University Press:  25 February 2011

S. A. Rodger ,
G. W. Groves ,
N. J. Clayden  and
C. M. Dobson
S. A. Rodger
Affiliation:
Dept. of Metallurgy and Science of Materials, Parks Road, Oxford University, OX1 3PH, England
G. W. Groves
Affiliation:
Dept. of Metallurgy and Science of Materials, Parks Road, Oxford University, OX1 3PH, England
N. J. Clayden
Affiliation:
Inorganic Chemistry Laboratory, South Parks Road, Oxford University, OX1 3QR, England
C. M. Dobson
Affiliation:
Inorganic Chemistry Laboratory, South Parks Road, Oxford University, OX1 3QR, England
Get access

Abstract

The hydration of a tricalcium silicate paste has been examined from very early stages, i.e. during the induction period, up to two and half years using both scanning and transmission electron microscopy as well as solid state nuclear magnetic resonance. This latter technique can be used to reveal the degree of hydration of the sample and the nature of the silicate units which make up the C-S-H gel. Solid state NMR shows that during the induction period a small amount of material containing hydrated monomeric silicate units is formed, although this is difficult to identify using SEM. However during the acceleratory period SEM shows the development of the typical fibrillar C-S-H material. Backscattered electron imaging shows the cores of anhydrous material surrounded by the denser inner product.

Thermogravimetric analysis has been used to find the C/S ratio of this material, which is approximately 1.8, whilst solid state NMR shows that the hydrated silicate units are largely dimeric at this stage. As hydration proceeds, the fracture surfaces become increasingly dominated by large calcium hydroxide crystals, although some fibrillar material can be identified even after over two years. The C-S-H contains progressively more middle units in silicate chains at the expense of the end units. A sample of tricalcium silicate hydrated for 26 years has also been examined.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 85: Symposium M – Microstructural Development During Hydration of Cement , 1986 , 13
Copyright
Copyright © Materials Research Society 1987

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. Taylor, H.F.W., Proc. Int. Congr. Chem. Cem., 8th, 1986 1, 82 (1986).Google Scholar
2. Clayden, N., Dobson, C.M., Hayes, C.J. and Rodger, S.A., Proc. Br. Ceram. Soc. 35, 55 (1984).Google Scholar
3. Jennings, H., Dalgliesh, B.J. and Pratt, P.L., J. Am. Ceram. Soc. 64 (10), 567 (1981).CrossRefGoogle Scholar
4. Menetrier, D., Jawed, I., Sun, T.S. and Skalny, J., Cem. Concr. Res. 9, 473 (1983).CrossRefGoogle Scholar
5. Stewart, H.R. and Bailey, J.E., J. Mater. Sci. 18(12), 43686 (1983).Google Scholar
6. Groves, G.W., this symposium.Google Scholar
7. Brown, P.W., Franz, E., Frohnsdorff, G. and Taylor, H.F.W., Cem. Concr. Res. 14, 257 (1984).Google Scholar
8. Maciel, G.E. and Sindorf, D.W., J. Am. Ceram. Soc. 102, 7607 (1980).Google Scholar
9. Rodger, S.A., PhD. Thesis, University of Oxford (1986).Google Scholar
10. Sueur, P.J. Le, Double, D.D. and Groves, G.W., Proc. Br. Ceram. Soc. 23, 177 (1984).Google Scholar
11. Hirljac, J., Wu, Z.-Q. and Young, J.F., Cem. Concr. Res. 13, 877 (1983).Google Scholar
12. Glasser, L.S. Dent, Lachowshi, E.E., Qureshi, M.Y., Calhoun, H.P., Embree, D.J., Jamieson, W.D. and Masson, C.R., Cem. Concr. Res. 1i, 775 (1984).Google Scholar
13. Birchall, D. and Thomas, N.L., Proc. Br. Ceram. Soc. 35, 305 (1984).Google Scholar
14. Iler, R.K., The Chemistry of Silica, (John Wiley and Sons, New York, (1979) p. 123.Google Scholar
15. Taylor, H.F.W., J. Am. Ceram. Soc. 69, 464 (1986).Google Scholar