Abstract

GRS is investigating sealing and backfilling materials planned to be utilized in salt and clay formations. The programme aims at providing experimental data needed for the theoretical analysis of the long-term sealing capacity of these sealing materials. In order to demonstrate hydro-mechanical material stability under representative load scenarios, a comprehensive laboratory testing programme is carried out. This comprises investigation of the sealing capacity of the combined seal system and impact of the EDZ as well as investigation of the hydro-chemical long-term stability of the seal in contact with different brines under diffusive and advective conditions. Within this paper, preliminary results from laboratory investigations on salt concrete are evaluated and accompanying modelling activities are shown, focusing on long-term viscous deformation properties of salt concrete.

1 Introduction

The DOPAS Full-Scale Demonstration of Plugs and Seals project performed by 14 beneficiaries from eight European countries focuses on demonstration activities in plugging and sealing. These activities are also a part of each participant's national long-term RD&D programmes and are therefore jointly funded by Euratom's Seventh Framework Programme and by national funding organisations. The demonstration experiments will be partially or entirely implemented during the DOPAS project lifetime from 2012 to 2016 (Dopas 2012).

ELSA is a programme of laboratory and in-situ experiments that aims at further developing the reference shaft seal for the German disposal concept for a repository in rock salt and at developing reference shaft seals for a repository in clay host rocks (Kudla et al. 2013).

On behalf of BMWi, the national funding organisation for R&D work related to radioactive waste management in Germany, GRS is investigating sealing and backfilling materials planned to be utilised in salt and clay formations. The programme is related to the DOPAS project and aims at providing experimental data needed for the theoretical analysis of the long-term sealing capacity of these sealing materials.

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