[en] This session gathers 3 articles dealing with: the influence of the transport parameter uncertainty on the long-term safety of nuclear waste repositories in clay formations (A. Ruebel); the transferability of external information to clay- and shale-hosted sites - use for supporting safety cases (M. Mazurek, A. Gautschi, P. Marschall, G. Vigneron, P. Lebon, J. Delay); and the investigations on safety relevant repository design in German clay formations (M. Jobmann, L. Uhlig, P. Amelung, H. Schmidt, M. Polster, D. Billaux, P. Hoth)

[en] This session gathers 4 articles dealing with: the seismic imaging of the variability in the Callovo-Oxfordian argillite (D. Guillemot, B. Yven); the identification of homogeneous zones from well logging measurements by statistical tools (A. Marache, J. Riss, A. Denis, B. Yven, A. Trouiller); the geostatistical characterization of Callovo-Oxfordian clay variability from high resolution log data (M. Lefranc, B. Beaudoin, J.P. Chiles, D. Guillemot, C. Ravenne, A. Trouiller); and the Magnetic properties, magnetic mineralogy and fabric of the argillites of the Meuse/Haute-Marne URL (J.L. Bouchez, L. Esteban, Y. Geraud, A. Trouiller, R. Siqueira)

[en] This session gathers 4 articles dealing with: in-situ thermal experiments carried out in Opalinus clay and Callovo-Oxfordian clay-stones by ANDRA Experiment set-up and measurement results (Y. Wileveau, K. Su); the characterization of the THM parameters of Callovo-Oxfordian mud-stone by interpretation of an in-situ heating test (B. Garitte, A. Gens, J. Vaunat, Y. Wileveau); the temperature buffer test: experimental and model results (M. Aekesson, A. Jacinto, A. Ledesma, M. de Combarieu); and the dismantling of the mock-up-CZ experiment (J. Pacovsky, J. Svoboda, R. Vasicek)

[en] This session gathers 4 articles dealing with: the Ontario Power Generation's proposed deep geologic repository for low and intermediate level radioactive waste, Bruce site, Ontario, Canada (M.R. Jensen, F.K. King); the design and realisation of the PRACLAY experimental gallery at the Hades URF (W. Bastiaens, F. Bernier); the extension of the Mont Terri Rock Laboratory and experiment programme (P. Bossart, H.J. Alheid, J. Delay, E. Frank, M. Hugi, K. Kiho, T. Rothfuchs); and the European bentonites as alternatives to MX-80 (D. Koch)

[en] This session gathers 4 articles dealing with: the geochemical behaviour of a bentonite barrier: results up to 8 years of Thermo-Hydraulic treatment in the laboratory (A.M. Fernandez, M.V. Villar, R. Gomez-Espina); the coupled THMC model of FEBEX mock-up test (L. Zheng, J. Samper); the couplings of THMC phenomena in deep argillaceous rock of a radioactive waste repository (A. Haxaire, I. Djeran-Maigre); and a THMC framework to consider microstructural effects in the analysis of clay barriers (L. do N. Guimaraes, M. Sanchez, A.M. Fernandez, A. Gens)

[en] This session gathers 4 articles dealing with: The Meuse/Haute-Marne Underground Research Laboratory: seven years of scientific investigations (J. Delay, P.L. Forbes, J. Roman); the CLAYTRAC project: evaluation of tracer profiles across argillaceous formations (M. Mazurek, P. Alt-Epping, A. Bath, S. Buschaert, A. Gautschi, T. Gimmi, H.N. Waber); the correspondence between sorption measured on compacted and dispersed systems and sorption model predictions (M.H. Bradbury, B. Baeyens); and clay seals in CO₂ storage (J.P. Gerling, B.M. Krooss, A. Busch, H.D. Vosteen, K. Reinhold)

[en] This session gathers 4 articles dealing with: the long-term geochemical evolution of the near field of a KBS-3 HLNW repository: insights from reactive transport modelling (D. Arcos, F. Grandia, C. Domenech, P. Sellin); the investigation of iron transport into bentonite from anaerobically corroding steel: a geochemical modelling study (F.M.I. Hunter, F. Bate, T.G. Heath, A. Hoch, L.O. Werme); SeO₃^2- adsorption on conditioned Na-illite: XAS spectroscopy, kinetics, surface complexation model and influence of compaction (C. Bruggeman, A. Maes, G. Montavon, E. Breynaert, Z. Guo, J. Vancluysen); the influence of temperature and gamma-irradiation on the anion sorption capacity of modified bentonites (B. Riebe, C. Bunnenberg, A. Meleshyn, S. Dultz)

[en] This session gathers 4 articles dealing with: the alteration processes in bentonites: mineralogical and structural changes during long-term and short-term experiments (J. Adamcov, I. Kolarikova); the implications from the lot experiment regarding the selection of an optimum HLRW bentonite (S. Kaufhold, R. Dohrmann); the extent of oxidation in Boom clay as a result of excavation and ventilation of the HADES URF: Experimental and modelling assessments (M. De Craen, M. Van Geet, M. Honty, L. Wang, E. Weetjens); and the magnetic and mineralogical alterations under thermal stress at 95 deg. C of Callovo-Oxfordian clay-stones (Bure, France) and lower Dogger Mont Terri clay-stones, Switzerland (J.P. Pozzi, C. Aubourg, D. Janots, M. Cathelineau, N. Clauer, D. Rousset, R. Ruck, N. Liewig, I. Techer)

[en] The meeting covers all topics concerning natural argillaceous geological barriers and the clay material based engineered barrier systems, investigated by means of: laboratory experiments on clay samples (new analytical developments), in situ experiments in underground research laboratories, mock-up demonstrations, natural analogues, as well as numerical modelling and global integration approaches (including up-scaling processes and treatment of uncertainties). The works presented deal with: examples of broad research programs (national or international) on the role of natural and artificial clay barriers for radionuclide confinement; clay-based repository concepts: repository designs, including technological and safety issues related to the use of clay for nuclear waste confinement; geology and clay characterisation: mineralogy, sedimentology, paleo-environment, diagenesis, dating techniques, discontinuities in rock clay, fracturing, self sealing processes, role of organic matter and microbiological processes; geochemistry: pore water geochemistry, clay thermodynamics, chemical retention, geochemical modelling, advanced isotopic geochemistry; mass transfer: water status and hydraulic properties in low permeability media, pore space geometry, water, solute and gas transfer processes, colloid mediated transport, large scale movements, long-term diffusion; alteration processes: oxidation effects, hydration-dehydration processes, response to thermal stress, iron-clay interactions, alkaline perturbation; geomechanics: thermo-hydro-mechanical behaviour of clay, rheological models, EDZ characterisation and evolution, coupled behaviour and models (HM, THM, THMC). A particular interest is given to potential contributions coming from fields of activities other than radioactive waste management, which take advantage of the confinement properties of the clay barrier (oil and gas industries, gas geological storage, CO₂ geological sequestration, chemical waste isolation). Abstracts are presented by session (18 oral sessions and 8 poster sessions)

[en] This session gathers 4 articles dealing with: the effects of temperature, pH, iron/clay ratio and liquid/clay ratio on the conversion of di-octahedral smectite into iron-rich clays: a review of experimental studies (M. Cathelineau, R. Mosser-Ruck, D. Rousset, D. Guillaume, D. Charpentier, K. Devineau, F. Villieras, N. Michau) the modelling of iron/bentonite interactions (D. Savage, C. Watson, S. Benbow, J. Wilson); the impact of iron on the bentonite buffer within the KBS-3H disposal concept: results from reactive transport modelling (P. Wersin, M. Birgersson, M. Snellman) and the characterization of a redox-modified clay mineral with respect to its suitability as a barrier in radioactive waste confinement A.S. Anastacio, A. Aouad, P. Sellin, J.W. Stucki)