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Electron Microscopical Studies of Tricalcium Silicate - Fly Ash Blended Pastes

Published online by Cambridge University Press:  21 February 2011

S. A. Rodger  and
G. W. Groves
S. A. Rodger
Affiliation:
Department of Metallurgy and Science of Materials, University of Oxford, Parks Road, Oxford, OXI 3PH, UK.
G. W. Groves
Affiliation:
Department of Metallurgy and Science of Materials, University of Oxford, Parks Road, Oxford, OXI 3PH, UK.
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Summary

Fly ash (FA) is becoming a common addition to ordinary portland cement (OPC) both in Europe and in the USA. Although a great deal of work has been carried out to characterize fly ashes from different sources, less work has been reported in the literature as to the exact nature of the reaction products when fly ash blends are hydrated. Microstructural studies carried out using scanning electron microscopy (SEM) of fracture surfaces have been summarized by Diamond [1]. The results often show a shell of reaction product around the fly ash residues. Some authors have postulated the formation of a duplex film of calcium hydroxide (CH) and calcium silicate hydrate (C-S-H) around the particles. However SEM alone cannot reveal the composition of features in the microstructure and interpretation on the basis of the morphology of the features may be misleading. Some analytical electron microscopy has been carried out using crushed particles of blended pastes [2] but this technique results in a loss of information about the location of analyzed areas.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 113: Symposium Q – Fly Ash and Coal Conversion By-Products IV , 1987 , 117
Copyright
Copyright © Materials Research Society 1988

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References

REFERENCES

1. Diamond, S., in 8th. Int. Conp. Chem. Cem. 1, 113 (1987).Google Scholar
2. Mohan, K. and Taylor, H.F.W., in Effects of Flyash Incorooration in Cement and Concrete, edited by Diamond, S., (Mater. Res. Soc. Proc. N, Boston, MA 1981) pp. 54–59.Google Scholar
3. Tenoutasse, N. and Marion, A.M., Brit. Ceram. Soc. Proc., 35, 359 (1984).Google Scholar
4. Hedges, E.S., Liesegang Rings and Other Periodic Structures, (Chapman and Hall, London, 1932).Google Scholar