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Accelerated Ageing of Blended OPC Cements

Published online by Cambridge University Press:  25 February 2011

K.C. Quilin ,
S.L. Duerden  and
A.J. Majumdar
K.C. Quilin
Affiliation:
Building Research Establishment, Garston, Watford, Herts, UK, WD2 7JR British Crown Copyright, 1993.
S.L. Duerden
Affiliation:
Building Research Establishment, Garston, Watford, Herts, UK, WD2 7JR British Crown Copyright, 1993.
A.J. Majumdar
Affiliation:
Building Research Establishment, Garston, Watford, Herts, UK, WD2 7JR British Crown Copyright, 1993.
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Abstract

An accelerated experimental technique using high wateπcement ratios has been developed to study the long term hydration of blended cements that may be used in a repository for the disposal of radioactive waste. This technique has been used to investigate the hydration reactions of Ordinary Portland Cement (OPC) blended with ground granulated blastfurnace slag (ggbs) or pulverised fuel ash (pfa). The effects of high sulphate-bearing and high carbonate-bearing ground waters on the compounds formed on hydration were investigated. Solid/solution compositional data were collected during the course of the hydration process for periods up to 2 years. Thomsonite, thaumasite, afwillite and a tobermorite-like phase were found in addition to the expected cement hydration products. The pH of the aqueous solution in contact with 60 pfa:40 OPC blends hydrated at 90°C fell to below 8. This is lower than the value required to inhibit the corrosion of steel canisters in a repository. The pH of the aqueous solution in contact with OPC and 75 ggbs:25 OPC blends remained above 11, although if the ground waters in contact with the OPC/ggbs blends were periodically replaced the pH eventually fell below 10.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 333: Symposium V – Scientific Basis for Nuclear Waste Management XVII , 1993 , 341
Copyright
Copyright © Materials Research Society 1994

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References

REFERENCES

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