Temperature effect on CEM-I and low-pH hydrated cement pastes in a clayey environment

Laurent de Windt (1) , Adèle Grellier (2) , Philippines Lalan (1) , Alexandre Dauzères (3)

1 GEOSCIENCES - Centre de Géosciences
2 IRSN - Institut de Radioprotection et de Sûreté Nucléaire
3 IRSN/PRP-DGE/SRTG/LETIS - Laboratoire d'Etude et de recherche sur les Transferts et les Installations dans les Sols

The CEMTEX project in the Tournemire URL studied the temperature effect on the in situ evolution of CEM-I and low-pH cement pastes in contact with argillite after 1, 2 and 5 years, in the context of radioactive waste disposals. Reactive transport modeling was used as a tool to support the most significant experimental results, e.g. occurrence of zeolite and well-crystallized C-S-H at the interface and reduction of cement alteration depth with temperature for CEM-I, but M-S-H precipitation and increase of alteration depth with temperature for low-pH cement.

Mots clés: degradation; interface; kinetics; M-S-H; reactive transport modeling; Tournemire

Domaines: Géochimie

Laurent de Windt, Adèle Grellier, Philippines Lalan, Alexandre Dauzères. Temperature effect on CEM-I and low-pH hydrated cement pastes in a clayey environment. NUWCEM - Cement-based Materials for Nuclear Wastes, Oct 2018, Avignon, France. ⟨hal-01913447⟩