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Leaching of Bituminized Waste Products (BWP) by Pure Water: The Contribution of NMR Techniques for the Investigation of the Porous Layer

Published online by Cambridge University Press:  15 February 2011

S. Le Feunteun ,
O. Diat ,
A. Guillermo ,
A. Ledieu  and
A. Poulesquen
S. Le Feunteun
Affiliation:
ICSM – UMR 5257, 30207 Bagnols sur Ceze, France
O. Diat
Affiliation:
ICSM – UMR 5257, 30207 Bagnols sur Ceze, France
A. Guillermo
Affiliation:
CEA Grenoble, INAC/SPrAM – UMR 5819, 38054 Grenoble Cedex 9, France
A. Ledieu
Affiliation:
CEA Marcoule, Nuclear Energy Division, DEN/DTCD, 30207 Bagnols sur Ceze, France
A. Poulesquen
Affiliation:
CEA Marcoule, Nuclear Energy Division, DEN/DTCD, 30207 Bagnols sur Ceze, France
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Abstract

The aim of this study is to improve the understanding of the water infiltration within Bituminized Waste Products (BWP) and the associated phenomena such as the development of the porous layer, the matrix swelling or the water uptake kinetics. Two sets of leaching experiments have been performed on synthesized model samples that are constituted by inactive soluble and/or insoluble salts (40% wt) embedded in bitumen. Large samples were used to quantify the water uptake kinetics and to control the macroscopic swelling of the matrixes during experiments. Smaller samples were used to characterize the depth distribution of the infiltrated water and its motion properties by NMR techniques (1H-T1 relaxation times and 1D-NMR imaging). These techniques enabled us to study the influence of the matrix chemical composition on the water advance in depth as a function of the leaching time. Results show that insoluble salts have a significant influence on water transport while soluble salts entail the development of large porosities. Preliminary results obtained with an original method based on the measurement of NMR relaxation times along the water concentration in depth are presented. They illustrate the great potential of the approach to further improve our knowledge on the establishment of the aqueous network.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1193: Scientific Basis for Nuclear Waste Management XXXIII , 2009 , 505
Copyright
Copyright © Materials Research Society 2009

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