Generation and Characterisation of Colloids of the Near Field / Far Field Interface


The generation of bentonite colloids has been investigated by means of column experiments with bentonite compacted at the engineering barrier density and using water flows as low as 0.04 ml/h (≈350 ml/year). Results on generation of bentonite colloids in these “all-bentonite” columns suggested that most of the colloidal material observed in the eluted water is due to erosion of the plug. Therefore new column experiments in which granite and compacted bentonite are in contact have been designed and the effects of the water flow analysed. The physico - chemical characteristics of the colloidal material obtained in the “all-bentonite” and “bentonite plus granite” column experiments have been compared as well as its stability. Results show that bentonite colloids that have been in contact with granite always present a higher negative charge, this indicating that they could be stable in the natural environment.

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  1. 1.

    The FEBEX (Full-scale Engineered Barriers Experiment) consist in an “in-situ” test, in natural conditions and at full scale; a “mock-up” test, at almost full scale and a series of laboratory tests to complement the information from the two large scale tests. The airn of the project is to study the behaviour of components in the near fielkd for a repository of high-level radioactive wastes in crystalline rock.

  2. 2.

    M.V. Villar and M. Pelayo in “Characterisation of “La Serrata” Clay used in the Febex project”. CIEMAT Technical Report 54A 14/1/96 (1996).

    Google Scholar 

  3. 3.

    L. Pérez del Villar, B. de la Cruz, J. Pardillo, J. Cózar, M. Pelayo, C. Marín, P. Rivas, E. Reyes, E. Caballero, A. Delgado, R. Nufiez, M.T. Crespo and M.P. Galim in “Lithogeochemical characterisation and evolutive model of the EI-Berrocal site: analogies with a HLRWR”. ENRESA Technical Publications: El Berrocal Project, Vol.1, 301–487 (1996)

    Google Scholar 

  4. 4.

    F. Ortuño, B. Ruiz, J. Pardillo, J. Guimera, J. Carrera in “3° Jornadas de I+D y tecnologia de gestión de residuos radiactivos” ENRESA Technical Publication 08/97 (1997)

    Google Scholar 

  5. 5.

    T. Missana, M.J. Turrero, A. Melon, A. Adell, A. Yllera, M.G. Gutierrez “The roke of colloids in the transport of radionuclide from a radioactive repository: Impact on colloid-borne radionuclide transport on safety assessment calculation” Second Annual Report E.C. Caress Project. May 1998

    Google Scholar 

  6. 6.

    R. Push, Clay Minerals, 27 353 (1992)

    Article  Google Scholar 

  7. 7.

    B. Fourest, N. Hakem, R. Guillamount, Radiochimica Acta, 66/67, 173–179 (1994)

    CAS  Article  Google Scholar 

  8. 8.

    M.J. Avena, R. Cabrol, C.P. de Pauli, Clays and Clay Minerals, 38(4), 356–362 (1990).

    CAS  Article  Google Scholar 

  9. 9.

    W. Stumm, J.J. Morgan in “Aquatic Chemistry” 2nd Ed, John Wiley and Sons, Cap 10 (1981)

    Google Scholar 

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Missana, T., Turrero, M.J. & Melon, A. Generation and Characterisation of Colloids of the Near Field / Far Field Interface. MRS Online Proceedings Library 556, 647 (1998).

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