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Abstract

When glass comes in contact with humid clay a complex phenomena arrives which comprehends leaching of some elements (e.g. alkali) and hydrolysis of the silica matrix. The elements which have been leached or which are released by the glass degradation can diffuses into the clay. An apparatus have been set up in order to study the glass degradation and the release and diffusion of various elements in clay. Tests have been conducted using Boom clay and the borosilicate glass I117 at 50 and 75 degrees C. Comparative tests have also been conducted using the French glass SON 68. It appears that, at least up to 225 days, the glass degradation increases linearly with time. No saturation phenomena are apparent. In order to describe the distribution of the different elements into the clay it appears necessary to subdivide the elements in two groups according to their solubility in the interstitial clay water. The value obtained for the diffusion coefficients are presented and discussed.

Additional information

Authors: LANZA F, JRC - ISPRA ESTAB. (ITALY);PARNISARI E JRC - ISPRA ESTAB. (ITALY), JRC - ISPRA ESTAB. (ITALY)
Bibliographic Reference: CHEMISTRY AND MIGRATION BEHAVIOUR OF ACTINIDES AND FISSION PRODUCTS IN THE GEOSPHERE, MUENCHEN (GERMANY) SEPT. 14-18, 1987 WRITE TO CEC LUXEMBOURG, DG XIII/A2, POB 1907 MENTIONING PAPER E 33578 ORA
Availability: Can be ordered online
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