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Creep and shrinkage behaviour of concrete supercontainers for radioactive waste disposal
ONDRAF/NIRAS has selected the supercontainer as the preferred Belgian design for disposal of vitrified high-level radioactive waste. This supercontainer is based on the use of an integrated waste package composed of a carbon steel overpack surrounded by a concrete buffer based on Ordinary Portland Cement. For the choice of the cementitious buffer, two different compositions are being considered: a SCC (self compacting concrete) and a traditional RPC (vibrated concrete). In this paper, the process of choosing a reference concrete composition for the buffer of the supercontainer will be explained. The requirements on the field of thermo-physical and mechanical strength differ significantly from those frequently used in classical structures. Consequently, an appropriate choice for aggregates, cement and superplasticizer results from these requirements. Creep and shrinkage are important structural factors to be considered for the long term safety of radioactive waste repositories. Subsequently, early-age shrinkage tests and long-term creep tests are performed to predict the mechanical behaviour of the concrete buffer. The results and the comparison between the SCC and the RPC will be discussed. This is a part of an intensive laboratory characterization program carried out to obtain concrete parameters used in a 3-dimensional thermal and crack modelling program.
Creep and shrinkage behaviour of concrete supercontainers for radioactive waste disposal
ONDRAF/NIRAS has selected the supercontainer as the preferred Belgian design for disposal of vitrified high-level radioactive waste. This supercontainer is based on the use of an integrated waste package composed of a carbon steel overpack surrounded by a concrete buffer based on Ordinary Portland Cement. For the choice of the cementitious buffer, two different compositions are being considered: a SCC (self compacting concrete) and a traditional RPC (vibrated concrete). In this paper, the process of choosing a reference concrete composition for the buffer of the supercontainer will be explained. The requirements on the field of thermo-physical and mechanical strength differ significantly from those frequently used in classical structures. Consequently, an appropriate choice for aggregates, cement and superplasticizer results from these requirements. Creep and shrinkage are important structural factors to be considered for the long term safety of radioactive waste repositories. Subsequently, early-age shrinkage tests and long-term creep tests are performed to predict the mechanical behaviour of the concrete buffer. The results and the comparison between the SCC and the RPC will be discussed. This is a part of an intensive laboratory characterization program carried out to obtain concrete parameters used in a 3-dimensional thermal and crack modelling program.
Creep and shrinkage behaviour of concrete supercontainers for radioactive waste disposal
Kriech- und Schwindungsverhalten von Superbehältern aus Beton für die Lagerung radioaktiver Abfälle
Craeye, B. (author) / Schutter, G. de (author) / Humbeeck, H. Van (author) / Cotthem, A. Van (author)
2009
7 Seiten, 10 Bilder, 3 Tabellen, 11 Quellen
Conference paper
English
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