Influence of bentonite and zeolite in cementation of dry radioactive evaporator concentrates
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To assess the safety for disposal of radioactive mortar-waste composition, the leaching Of (137)Cs, (60)Co, and (85)Sr from immobilized radioactive evaporator concentrate, into a surrounding fluid has been studied. This paper also presents results from studies made to determine the influence of natural adsorbents (bentonite and zeolite) in immobilization of evaporator concentrate in cement matrix, by measuring leachability of (137)Cs, (60)Co, and (85)Sr. Leaching tests were carried out in accordance with a method recommended by IAFA during 300 days. From the leaching data the apparent diffusivity of cobalt, cesium, and strontium in the cement-bentonite matrix was measured. The uniaxial compressive strength of eleven mortar samples was determined following the ASTM standards. These results are part of a 30-year mortar and concrete testing project which will contribute to the design of radioactive waste management for a future Serbian radioactive waste disposal center. (C) 2008 Published... by Elsevier B.V.
Keywords:Immobilization / Diffusion / Leaching / Cement / Bentonite / Clinoptilolite / Evaporator concentrate
Source:Applied Clay Science, 2009, 43, 1, 9-12
- Ministry of Science of the Republic of Serbia [142050Gamma]