Long term evaluation on the groundwater chemistry due to cement materials with numerical simulation

Diego, S.*; Elena, A.*; Marti, B.*; Salvador, J.*; Jorge, M.*; Tanaka, Tatsuya*; Hashimoto, Shuji*; Iwatsuki, Teruki  ; Onoe, Hironori 

The objective of this study was to develop a reactive transport modelling method that reproduces the evolution of the hyperalkaline plume in the bedrock, which is supposed to be generated by the concrete degradation. Precipitated secondary minerals can reduce porosity up to the point to induce important changes on hydraulic conductivity. In this study, the modelling method has been applied to the Mizunami Underground Research Laboratory, which is carried out by the Japan Atomic Energy Agency. This study shows that iCP (interface COMSOL-PHREEQC) is a flexible and powerful tool for quantitative integration of hydrogeology and geochemistry. iCP allows to incorporate geochemical processes in 3D large scale COMSOL models and for long-time simulations.