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TRIALS AND CONTROL OF PLACING FILLING AND SEALING MATERIALS FOR DEPOSITS IN SCALE MODELS

Objectif

THE CONTAINERS OF RADIOACTIVE WASTES OF HIGH OR LOW LEVEL ACTIVITY WILL BE DISPOSED OF IN VERTICAL SHAFTS OR HORIZONTAL GALLERIES. IN ORDER TO AVOID ANY GROUNDWATER CIRCULATION IN CONTACT WITH THE CONTAINERS THE VOID BETWEEN THE ROCK AND THE CONTAINERS WILL BE FILLED WITH SEALING MATERIALS.
THE MATERIALS, SUBJECT OF THIS STUDY, ARE CEMENT BASED MORTAR FORMULATIONS WHICH ARE THE RESULTS OF PREVIOUS STUDIES AND EXPERIENCES OF SOLETANCHE AND C.E.A. THESE MATERIALS MADE OF WATER, CEMENT, CLAY AND ADDITIVES HAVE TO EXHIBIT VARIOUS MECHANICAL CHARACTERISTICS AS STABILITY, IMPERVIOUSNESS, DURABILITY, POSSIBLE RETENTION TOWARDS RADIOACTIVE CATIONS AND ABOVE ALL EASY PLACING IN ORDER TO ASSURE A GOOD QUALITY FILLING AND SEALING.
THE FIRST OBJECTIVE IS TO EVALUATE THE HEREABOVE CHARACTERISTICS OF VARIOUS MORTAR FORMULATIONS, THROUGH LAB TESTS, IN ORDER TO SELECT FOUR FORMULATIONS BEST SUITED TO THE FILLING AND SEALING.
THE SECOND OBJECTIVE IS TO IMPROVE AND FINALIZE THE PLACING METHOD OF MATERIALS IN SCALE MODELS. TO THAT AIM, EACH OF FOUR SCALE MODELS WILL BE, ONE AFTER EACH OTHER, FILLED, CURED AT VARIOUS TEMPERATURES, TESTED AND DISMANTLED FOR EXAMINATION IN ORDER TO DEFINE THE BEST MATERIAL PLACING TECHNIQUE.

1. LABORATORY STUDIES
1.1. THEORETICAL STUDIES. FROM THE PREVIOUS STUDIES AND EXPERIENCES, CHOICE OF FILLING MATERIAL FORMULATIONS.
1.2. PRESELECTION TESTS (BASED ON THE PLACING CRITERIA). THE RHEOLOGICAL PROPERTIES OF THE HEREABOVE FORMULATIONS ARE MEASURED IN FLUID STATE (VISCOSITY, SHEAR STRENGTH, BLEEDING, WORKABILITY LIMIT).
1.3. FINAL SELECTION OF FORMULATIONS. MEASUREMENTS OF CHARACTERISTICS OF HARDENED MATERIALS (STRENGTH, SHRINKAGE, WATER CONTENT, PERMEABILITY, THERMAL CONDUCTIVITY, MICROSTRUCTURE, RETENTION AND DIFFUSION OF CAESIUM IONS) CURED AT VARIOUS TEMPERATURE (20, 50 AND 80 CELSIUSDEGREES).

2. EXPERIMENTAL STUDIES.
2.1. VERTICAL SCALE MODELS. FILLING AND QUALITY CONTROLS OF TWO SUCCESSIVE VERTICAL SCALE MODELS.
- STUDY AND IMPROVEMENTS OF MATERIALS PLACING AND INSTRUMENTATION.
- CONTROLS OF FRESH AND HARDENED MATERIALS IN LAB AND IN SITU.
- CONTROLS AND TESTS OF FILLING AND SEALING PROPERTIES OF MATERIALS IN THE SCALE MODELS.
2.2. HORIZONTAL SCALE MODELS. FILLING AND QUALITY CONTROLS OF TWO SUCCESSIVE HORIZONTAL SCALE MODELS.
- SAME TESTS AND CONTROLS AS VERTICAL MODELS.
- FINALIZATION OF MATERIALS PLACING TECHNIQUE. PARTICULAR SPECIFICATIONS FOR HORIZONTAL SCALE MODELS.

Thème(s)

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Appel à propositions

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Régime de financement

CSC - Cost-sharing contracts

Coordinateur

Soletanche Entreprise SA
Contribution de l’UE
Aucune donnée
Adresse
6 rue de Watford
92000 Nanterre
France

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Coût total
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