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

J. L. García-Calvo; M. Sánchez; L. Fernández-Luco; M. C. Alonso

doi:10.3989/mc.2016.02615

Autores/as

J. L. García-Calvo Eduardo Torroja Institute for Construction Science, IETcc-CSIC
M. Sánchez Eduardo Torroja Institute for Construction Science, IETcc-CSIC
L. Fernández-Luco INTECIN-University of Buenos Aires
M. C. Alonso Eduardo Torroja Institute for Construction Science, IETcc-CSIC

DOI:

https://doi.org/10.3989/mc.2016.02615

Palabras clave:

Residuos radioactivos, Proporción de mezcla, Durabilidad, Deformación, Corrosión

Resumen

Previo al empleo de materiales con cementos de bajo pH en almacenamientos geológicos profundos (AGP) de residuos radiactivos de alta actividad, características relacionadas con su durabilidad a largo plazo deben ser verificadas. Así, su estabilidad volumétrica se ha analizado en morteros y hormigones de bajo pH basados en OPC o CAC, con elevados contenidos de adiciones minerales. Estos presentaron retracciones autógenas similares a las medidas en materiales convencionales, pero retracciones por secado mayores en los basados en OPC y altos contenidos de humo de sílice. Dado que en zonas de los AGP podría emplearse hormigón armado, también se evaluó la susceptibilidad a la corrosión de aceros al carbono y aceros galvanizados en materiales de bajo pH basados en OPC. Se detectó un inicio temprano de corrosión en los primeros debido al bajo pH presente en el fluido de los poros de estos materiales, sin detectarse problemas al emplear aceros galvanizados.

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