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Time Depndence of pH in a Cementitious Repository

Published online by Cambridge University Press:  26 February 2011

Alan Atkinson ,
Nicoia M. Everitt  and
Richard M. Guppy
Alan Atkinson
Affiliation:
Materials Development Division, Building 429, Harwell Laboratory, Didcot, Oxfordshire 0X11 ORA, United Kingdom.
Nicoia M. Everitt
Affiliation:
Materials Development Division, Building 429, Harwell Laboratory, Didcot, Oxfordshire 0X11 ORA, United Kingdom.
Richard M. Guppy
Affiliation:
Materials Development Division, Building 429, Harwell Laboratory, Didcot, Oxfordshire 0X11 ORA, United Kingdom.
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Abstract

The pH of a cementitious radioactive waste repository is expected to decrease with time as water leaches out soluble ions or as a result of reactions between repository constituents. These processes have been simulated in the laboratory and the results compared with behaviour anticipated from the known chemistry of cement compounds.

The studies indicate that the pH in Portland cements and Blast Furnace Slag cements (BFS) is likely to remain above 10.5 for very long periods of time, of the order of several hundred thousand years for a typical repository. They also show that extensive use of Pulverized Fuel Ash (PFA) leads to uncertainty in long term pH which could be as low as 9 to 10 in some cases.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 127: Symposium BERLIN – Scientific Basis for Nuclear Waste Management XII , 1988 , 439
Copyright
Copyright © Materials Research Society 1989

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References

REFERENCES

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