Development of risk management system for long-term stability of cementitious materials in important structures at deep underground

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In this study, the risk of CO_2 leakage through the well for Carbon Captured and Storage and the long-term performance of artificial cement barrier in the facility of nuclear waste disposal are numerically and experimentally analyzed. The leakage risk is examined focusing on the cracking of cement paste in the well due to CO_2 injection pressure and the chemical deterioration of the cement paste exposed to high temperature, high pressure and high concentration of CO_2 at deep underground. The calcium leaching to increase the risk of radioactive nuclide leakage is investigated using previous numerical models to deliberate dominant parameters for the leaching.