Integrated Approach to Modeling Long-Term Durability of Concrete Engineered Barriers in LLRW Disposal Facility

Abstract

This paper describes an integrated approach to developing a predictive computer model for long-term performance of concrete engineered barriers utilized in LLRW and ILRW disposal facilities. The model development concept consists of three major modeling schemes: hydration modeling of the binder phase, pore solution speciation, and transport modeling in the concrete barrier and service environment. Although still in its inception, the model development approach demonstrated that the chemical and physical properties of complex cementitious materials and their interactions with service environments can be described quantitatively.

Applying the integrated model development approach to modeling alkali (Na and K) leaching from a concrete pad barrier in an above-grade tumulus disposal unit, it is predicted that, in a nearsurface land disposal facility where water infiltration through the facility is normally minimal, the alkalis control the pore solution pH of the concrete barriers for much longer than most previous concrete barrier degradation studies assumed. The results also imply that a highly alkaline condition created by the alkali leaching will result in alteration of the soil mineralogy in the vicinity of the disposal facility.

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References

  1. 1.

    J.H. Lee, Ph.D. thesis, The Pennsylvania State University, 1993.

    Google Scholar 

  2. 2.

    F.M. Lea, The Chemistry of Cement and Concrete. 3rd ed. (Chemical Publishing Co. 1971).

    Google Scholar 

  3. 3.

    H.F.W. Taylor, Adv. Cem. Res. 1, 5 (1987).

    CAS  Article  Google Scholar 

  4. 4.

    J.H. Lee, D.M. Roy, P.H. Licastro and B.E. Scheetz, in Nuclear Waste Management IV, edited by G.G. Wicks, D.F. Bickford and L.R. Bunnell (Cer. Trans. Vol. 23, 1991) pp. 171–180.

    CAS  Google Scholar 

  5. 5.

    P. Longuet, L. Burglen and A. Zelwer, Revue des Materiaux de Construction et de Travaux Publique, No. 676, 35 (1973).

  6. 6.

    M.R. Silsbee, Ph.D. thesis, The Pennsylvania State University, 1988.

    Google Scholar 

  7. 7.

    T.C. Powers, in the Chemistry of Cements. Vol. 1, edited by H.F.W. Taylor, (Academic Press, London, 1964) pp. 391–416.

    Google Scholar 

  8. 8.

    W. Stumm, and J.J. Morgan, Aquatic Chemistry: An Introduction Emphasizing Chemical Equilibria in Natural Waters. 2nd ed. (John Wiley & Sons, Inc., 1981).

    Google Scholar 

  9. 9.

    H.C. Helgeson, Am. J. Sci. 267, 729 (1969).

    CAS  Google Scholar 

  10. 10.

    J.D. Allison, D.S. Brown and K.J. Novo-Gradac, Report EPA/600/3-91/021, U.S. Environmental Protection Agency, 1991.

    Google Scholar 

  11. 11.

    F.P. Glasser, and J. Marr, in the Chemistry and Chemically-Related Properties of Cement. edited by F.P. Glasser (British Cer. Soc. Proc. No. 35, 1984) pp. 419–429.

  12. 12.

    F.P. Glasser, D.E. Macphee and E.E. Lachowski, in Scientific Basis for Nuclear Waste Management XI. edited by M.J. Apted and R.E. Westerman (Mater. Res. Soc. Proc. 112, Pittsburg, PA, 1988) pp. 3–11.

    CAS  Google Scholar 

  13. 13.

    J.A. Larbi, L.A. Fraay and J.M. Bijen, Cem. Con. Res. 20, 506 (1990).

    CAS  Google Scholar 

  14. 14.

    S.B. Garland II, S.D. Van Hoesen and T.F. Scanlan, in Waste Management -89 Vol. II. edited by R.G. Post (1989) pp. 23–28.

    Google Scholar 

  15. 15.

    J.H. Lee, and D.M. Roy, in Sym. Proc. on Environmental and Waste Management Issues in the Ceramic Industry, April 24-28, 1994, Indianapolis, IN (in press).

    Google Scholar 

  16. 16.

    A.L. Bunge, and C.J. Radke, SPEJ 22(6), 998 (1982).

    CAS  Google Scholar 

  17. 17.

    J. Eikenberg, and P.C. Lichtner, in Water-Rock Interaction. Vol. 1 (A.A. Balkema, Rotterdam, Netherlands, 1992) pp. 377–380.

    CAS  Google Scholar 

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Lee, J.H., Roy, D.M., Manna, B. et al. Integrated Approach to Modeling Long-Term Durability of Concrete Engineered Barriers in LLRW Disposal Facility. MRS Online Proceedings Library 353, 881–889 (1994). https://doi.org/10.1557/PROC-353-881

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