Abstract This paper presents the process of ANDRA for the characterization of backfilling materials for a deep radioactive waste disposal in crystalline rocks. The experimental programme was developed in collaboration with the CEA/DRDD; the main objective was to build a comprehensive methodology of characterization, applied to the French Ca-smectite clay, ldFo-Card clay selected from several French deposits. For this programme specific experimental facilities are needed adapted to this kind of material. The main results concerning thermal, hydraulic and radioelement transfer properties are presented for pure Fo-Ca clay, or used in mixtures with different components such as sand, graphite or talc. Hydraulic properties of Fo-Ca and Na-bentonite MX-80 are compared and discussed.
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