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반응성용질이동 모델링을 이용한 장기간의 콘크리트 변질과정과 우라늄의 용해도에 대한 개념 모델링
최병영,고용건,김건영,유시원,안상원,배대석,Choi, Byoung-Young,Koh, Yong-Kwon,Kim, Geon-Young,Yoo, Si-Won,An, Sang-Won,Bae, Dae-Seok 한국방사성폐기물학회 2008 방사성폐기물학회지 Vol.6 No.1
Long-term degradation of coment barrier by diffusion was studied with reactive transport modeling. The result of modeling showed that cement barrier was altered about 30cm thickness after 50,000 years. The pH decreased from 13.0 to 11.9 because of depletion of alkali ions, and dissolution/precipitation of portlandite and CSH (Calcium Silicate Hydrate). In addition, porosity increased about 0.3 because of dissolution of portlandite and $CSH2.0(Ca_2SiO_3(OH)_2:0.17H_2O)$. The solubility of uranium also increased with the increase of pe value The results of this study indicate that long-term degradation of comet can enhance the transport of nuclide by changing pH, pe, porosity in barrier.