Hostname: page-component-586b7cd67f-2plfb Total loading time: 0 Render date: 2024-11-25T17:52:10.653Z Has data issue: false hasContentIssue false
  • English
  • Français

The Effect of Fly Ash on the Hydration of Cements At Low Temperature Mixed and Cured in Sea-Water

Published online by Cambridge University Press:  21 February 2011

H.-U. Jensen  and
P. L. Pratt
H.-U. Jensen
Affiliation:
Depattment of Materials, Imperial College of Science & Technology, Prince Consort Road, London SW7 2BP, UK
P. L. Pratt
Affiliation:
Depattment of Materials, Imperial College of Science & Technology, Prince Consort Road, London SW7 2BP, UK
Get access

Abstract

The use of fly ash as a partial replacement in cements is widespread because of reduced costs and the reported improvement in performance. Fly ash/cement blends have been used offshore for underbase grouting of gravity platforms, although the cold marine exposure may slow the pozzolanic reaction which is very sensitive to temperature. Sea-water could be used as mixing water under these conditions. This paper looks at how curing at 8°C, the use of sea-water as mixing water, and direct exposure to sea-water, influence the hydration, strength and microstructural development of an OPC and an SRPC with 30% fly ash replacement. The early heat evolution was measured with a conduction calorimeter, while the presence and development of hydration products were identified by DTA, TG and x-ray analysis. Scanning electron microscopy was used in two modes; secondary electron images of fracture surfaces were examined, and a quantitative description of microstructure was made possible by analysis of backscattered electron images of polished sections. The morphology and distribution of hydration products in the wet state was studied using an environmental cell in a high voltage electron microscope.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 113: Symposium Q – Fly Ash and Coal Conversion By-Products IV , 1987 , 279
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. Regourd, M., Performance of Concrete in Marine Environment, ACI SP65, pp. 63–83 (1980).Google Scholar
2. Mindess, S. and Young, J.F., Concrete, (Prentice-Hall Inc, 1981).Google Scholar
3. Lea, F.M., The Chemistry of Cement and Concrete, 3rd ed. (Edward Arnold Ltd, 1970).Google Scholar
4. Neville, A.M., Properties of Concrete, 3rd ed. (Pitman Press, London, 1981).Google Scholar
5. Ikebe, M., Semento Konkiriito, 146, 16–22 (1959).Google Scholar
6. Dempsey, J.G., J. Amer. Conc. Inst., 48, 157–166 (1951).Google Scholar
7. Narver, D.C., Civ. Eng., 24(16), 40–44 (1954).Google Scholar
8. Mather, B. and Tye, R.V., Corps of Engineers, US Army Miss. Technical Report 6–440 (1956).Google Scholar
9. Abrams, D.A., J. Am. Conc. Inst., 20, 442–486 (1924).Google Scholar
10. Taylor, M.A. and Kuwairi, A., Cem. Conc. Res., 8 491–500 (1978).CrossRefGoogle Scholar
11. Domone, P.L. and Thurairatnam, H., Mag. Conc. Res., 38 29–138 (1986).CrossRefGoogle Scholar
12. Conjeaud, M., Performance of Concrete in Marine Environment, ACI SP65, pp. 39–62.Google Scholar
13. Scrivener, K.L., “The Development of Microstructure during the Hydration of Portland Cement”, PhD Thesis, University of London (1984).Google Scholar
14. Young, J.F., Powder Technology, 9 173–149 (1974).CrossRefGoogle Scholar
15. Ramachandran, V.S., Calcium Chloride in Concrete, (Applied Science Publishers, UK, 1976).Google Scholar
16. Roberts, M.H., Mag. Conc. Res., 14 143–154 (1962).CrossRefGoogle Scholar
17. Lambert, P., “Corrosion and Passivation of Steel in Concrete”, PhD Thesis, University of Aston in Birmingham (1983).Google Scholar
18. Buck, A.D., Proc. 8th Int. Cong. Chem. Cem., Rio de Janeiro, 11.2, pp. 417–424 (1986).Google Scholar
19. Dewar, J.D., Cem. Conc. Ass., TRA/374 (1963).Google Scholar
20. Kuhl, H., Verlag Technik XII, Berlin, pp. 522 (1952).Google Scholar
21. Kurczyk, H.G. and Schwiete, H. E., Tonindustrie-Zeitung, B4(24), 585–598 (1960).Google Scholar
22. Takemoto, K. and Uchikawa, H., Proc. 7th Int. Cong. Chem. Cem., Paris, IV, 2/1 (1980).Google Scholar
23. Holden, W.R., Page, C.L. and Short, N.R. in Corrosion of Reinforcement in Concrete Construction, edited by A.P., Crane, (Ellis Horwood Ltd, 1983), pp. 143–150.Google Scholar
24. Regourd, M., The Action of Sea-water on Cements, Annales de l'Institut Technique du Batiment et des Travaux Publics, 329, pp. 86–102 (1975).Google Scholar
25. Mehta, P.K., Performance of Concrete in Marine Environment, ACI SP65, pp. 1–20 (1980).Google Scholar
26. Buenfeld, N.R. and Newman, J.B., Mag. Conc. Res., 26(127), 70–86 (1984).Google Scholar