Interactions Between C-steel and Blended-Cement in Concrete Under Radwaste Repository Conditions at 80 °C

Fábián, Margit and Czompoly, Ottó and Tolnai, István and De Windt, Laurent (2023) Interactions Between C-steel and Blended-Cement in Concrete Under Radwaste Repository Conditions at 80 °C. SCIENTIFIC REPORTS. pp. 1-26. ISSN 2045-2322 (Submitted)

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Abstract

Deep geological repository is widely considered as the preferred solution for the final disposal of high-level radioactive waste. Investigation representative of the Hungarian disposal concept was conducted using mock-up diffusion cells to study the chemical changes of S235JR carbon canister and CEM II/B PURAM concrete under anerobic and water saturated conditions at 80 °C. Micro-Raman, SEM-EDX, fluid and potentiometric analysis were performed over a period of 12 months. The discussion was supported by thermodynamic and reactive transport modeling. The findings revealed that a uniform corrosion process occurred, leading to rapid passivation of the C-steel with magnetite as the primary corrosion product. Modeling demonstrated that the increase in temperature to 80 °C and the chemical evolution of the concrete did not significantly affect the corrosion passivation process. Although the formation of Fe-siliceous hydrogarnets is thermodynamically possible at 80 °C, it did not jeopardize magnetite passivation. Overall, the results suggest that the containers would have a long lifespan under the studied disposal conditions.

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