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Bituminized Waste Leaching in Restricted and Free Swelling Conditions: Mechanisms and Analytical Modeling

Published online by Cambridge University Press:  21 March 2011

X. Lefebvre ,
J. Sercombe ,
A. Ledieu ,
B. Gwinner  and
F. Adenot
X. Lefebvre
Affiliation:
CEA Marcoule, DTCD/SPDE/L2ED, Bât 37, 30207 Bagnols sur Cèze, France
J. Sercombe
Affiliation:
CEA Marcoule, DTCD/SPDE/L2ED, Bât 37, 30207 Bagnols sur Cèze, France
A. Ledieu
Affiliation:
CEA Marcoule, DTCD/SPDE/L2ED, Bât 37, 30207 Bagnols sur Cèze, France
B. Gwinner
Affiliation:
CEA Marcoule, DTCD/SPDE/L2ED, Bât 37, 30207 Bagnols sur Cèze, France
F. Adenot
Affiliation:
CEA Marcoule, DTCD/SPDE/L2ED, Bât 37, 30207 Bagnols sur Cèze, France
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Abstract

The leaching behavior of nuclear wastes embedded in bitumen has been extensively studied for a decade by many teams of researchers. The main conclusion is that both water uptake and salts release obey to a diffusive regime. The most preponderant parameters of the Bituminized Waste Products (BWPs) leaching are, on the one hand, the nature and the content of the salts that are embedded in the bitumen, and on the other hand, the microstructure of bitumen and the external constraint applied to this confining material.

The numerical code COLONBO, designed by the CEA, allows to predict the behavior of the BWPs leaching in the case of salts embedded in soft bitumen and in free swelling conditions (no mechanical constraints during the leaching). This paper intends to achieve two goals: (i) to propose an analytical resolution of the system of equations implemented in COLONBO by using accurate simplification. The validation of this approach relies on the comparison with the predicted solutions of COLONBO and, when available, with the experimental results. (ii) To extend this simplified modeling to the case of restricted swelling conditions. The point is that the validation of this approach would allow us to propose a unified system of equations, allowing to simulate the BWPs leaching in whatever conditions and improving consequently the field of validity of the predictions for the behavior of bituminized waste products.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 932: Symposium – Scientific Basis for Nuclear Waste Management XXIX , 2006 , 48.1
Copyright
Copyright © Materials Research Society 2006

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References

REFERENCES

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