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Model Calculations of Porosity Reduction Resulting From Cement-Tuff Diffusive Interaction

Published online by Cambridge University Press:  10 February 2011

Peter C. Lichtner ,
Roberto T. Pabalan  and
Carl I. Steefel
Peter C. Lichtner
Affiliation:
Center for Nuclear Waste Regulatory Analyses, San Antonio, TX 78238-5166U.S.A.
Roberto T. Pabalan
Affiliation:
Center for Nuclear Waste Regulatory Analyses, San Antonio, TX 78238-5166U.S.A.
Carl I. Steefel
Affiliation:
Department of Geology, University of South Florida, Tampa, FL 33620U.S.A.
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Abstract

To determine the potential effects of alkaline plume migration on the near-field environment of the proposed high-level radioactive waste geologic repository at Yucca Mountain, Nevada, calculations are conducted simulating interactions between cement and tuff with pure diffusive transport of solute species. The calculations used the reactive transport submodule GEM of the computer code MULTIFLO [6]. The results suggest that strong alteration of the tuff host rock and of cement in contact with the tuff could result from these interactions. Porosity reduction within the tuff could isolate the matrix from fracture pore water. The model calculations predict calcification of the cement as would be expected. In simulations involving counter-diffusive transport across the cement-tuff contact, calcification is more pronounced in a partially-saturated environment compared to a fully-saturated one.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 506: Symposium – Scientific Basis for Nuclear Waste Management XXI , 1997 , 709
Copyright
Copyright © Materials Research Society 1998

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References

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