Ravi A. Patel, Janez Perko, Diederik Jacques, Geert De Schutter, Guang Ye and Klaas Van Breugel
Magnel Laboratory for Concrete Research , Department of structural engineering , Ghent University, Ghent, Belgium
Belgian Nuclear research Centre SCK•CEN, Institute for Environment Health and Safety, Mol, Belgium
Precipitation and dissolution mechanisms are present in many natural porous media systems. These two mechanisms typically change the geometry of a pore system. As a consequence also physical properties change. Precipitation and dissolution are based on geochemical conditions in the system, which is usually defined by more or less complex chemistry.
The proposed approach uses LB method which has the capability to handle multicomponent mass transport through varieties of geochemical systems with complex pore network. The LB multi-component transport model is then coupled with the well-established geochemical reaction code PHREEQC which solves for thermodynamic equilibrium in mixed aqueous-solid phase system with homogenous and heterogeneous reactions. The solid phases volumes are updated based on precipitation or dissolution and boundaries of solid are updated using static update rules. Here several benchmarks and example cases are presented to show the applicability of developed code to the problems involving precipitation and dissolution.