Skip to main content Accessibility help

Modelling of the Evolution of Porewater Chemistry in a Cementitious Repository

  • A. Haworth (a1), S.M. Sharland (a1) and C.J. Tweed (a1)


The current concept for disposal of low- or intermediate-level nuclear waste in the UK includes a largely cementitious backfill. An important factor in determining nuclide release rates from the repository is the pH in the near-field. In this paper, we describe development of a coupled chemistry/transport model of cement degradation and its application in determining the evolution of the chemistry within the repository. In particular, the effect of the cement formulation and interaction with groundwater species on the evolution of the pH is examined. The model is sufficiently flexible to consider a number of different repository scenarios.



Hide All
1. Atkinson, A. and Guppy, R., ‘The evolution of pH in a radwaste repository: Leaching of modified cements and reactions with groundwater’, Harwell Laboratory Report AERE-R12961 (1988).
2. Haworth, A., Sharland, S.M. and Tweed, C.J., ‘Modelling of the degradation of cement in a nuclear waste repository’, Proc. 12th Int. Symposium for the Scientific Basis of Nuclear Waste Management, Berlin MRS Vol 127 p 447454 (1988)
3. Berner, U., ‘Modelling the Incongruent Dissolution of Hydrated Cement Minerals’, Radiochimica Acta, Proc.Int.Conf. on Chemistry and Migration Behaviour of Actinides and Fission Products in the Geosphere, Munich (1987).
4. Atkinson, A., Everitt, N.M. and Guppy, R, ‘Evolution of pH in a Radwaste Repository: Experimental Simulation of Cement Leaching’, Harwell Laboratory Report AERE-R 12594 (1987).
5. Haworth, A., Sharland, S.M., Tasker, P.W. and Tweed, C.J., ‘A Guide to the Coupled Chemical Equilibria and Migration Code CHEOMATE’, Harwell Laboratory Report NSS-R113 (1988)
6. Parkhurst, D.L, Thorstenson, D.C and Plummer, L.N., U.S. Geological Survey, Water Resources Investigations, 8096 (1985)
7. Greenberg, S.A. and Chang, T.N., J. Phys. Chem., 69, p182 (1965)
8. Atkinson, A. and Hearne, J.A., ‘An Assessment of the Long Term Durability of Cement in Radioactive Waste Repositories’, Harwell Laboratory Report AERE-R-11465 (1987)


Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed