Materiales de Construcción, Vol 66, No 321 (2016)

Shrinkage behaviour and related corrosion performance of low-pH cementitious materials based on OPC or CAC

J. L. García-Calvo
Eduardo Torroja Institute for Construction Science, IETcc-CSIC, Spain

M. Sánchez
Eduardo Torroja Institute for Construction Science, IETcc-CSIC, Spain

L. Fernández-Luco
INTECIN-University of Buenos Aires, Argentina

M. C. Alonso
Eduardo Torroja Institute for Construction Science, IETcc-CSIC, Spain


Prior to using low-pH cementitious materials in underground repositories for high level waste, the characteristics determining their long-term durability must be analysed in depth. In this sense, different shrinkage tests have been made on mortar and concrete specimens using low-pH cement formulations based on ordinary portland cement (OPC) or calcium aluminate cement (CAC), with high mineral admixtures contents. They showed similar autogenous shrinkage than samples without mineral admixtures but higher drying shrinkage when materials based on OPC with high silica fume contents were considered. Besides, as the use of reinforced concrete could be required in underground repositories, the susceptibility of reinforcement to corrosion when using low-pH cementitious materials based on OPC was analyzed, considering carbon steel and galvanized steel. In the formers corrosion was detected due to the low pore solution pH but any problem was detected when galvanized reinforcement were used.


Radioactive wastes; Mixture proportion; Durability; Deformation; Corrosion

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