Journal
CEMENT AND CONCRETE RESEARCH
Volume 162, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.cemconres.2022.107013
Keywords
Radioactive waste management; Low-pH cement; Calcium-silicate-hydrate (C-S-H); SEM and X-ray diffraction characterizations
Funding
- Andra (Agence nationale pour la gestion des dechets radioactifs (French national agency for the management of radioactive waste)
- Conseil Regional du Nord-Pas de Calais
- European Regional Development Fund (ERDF)
- Institut National des Sciences de l'Univers (INSU, CNRS)
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This paper presents the chemical and mineralogical characterizations of a cementitious material and its behavior to temperature increase. The results show that the mineralogical composition of the material evolves during setting and heating, leading to the formation of new minerals.
This paper presents the chemical and mineralogical characterizations of a cementitious material and its behaviour to temperature increase in conditions close to those of radioactive waste storage. The formulation, based on a CEM III/C, silica fume, bentonite and hydrotalcite makes a low-pH cementitious grout with a low viscosity. Results show that the mineralogical composition of this material evolves during setting. Two years after setting, it is a macro porous geomaterial, composed of few C-(A)-S-H with a low C/S ratio (<0.4) formed from the blast furnace slags. It also contains well-crystallized ettringite, hydrotalcite, calcite and still non hydrated C2S. In contact with air, a substantial enrichment in calcite and gypsum is observed. The heating up to 90 degrees C leads to the transformation of the Na-rich smectite of the bentonite into a Ca and/or Mg-rich one and the formation of opal -CT, vaterite and aragonite. Hydrotalcite is stable whereas gypsum and anhydrite disappear.
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