Modeling of Ion Transport and Heterogeneous Equilibria in Cathodic Protection Systems for Concrete

W. H. A. Peelen1, R. B. Polder1, E. Redaelli2, and L. Bertolini
1TNO Built Environment and Geosciences, Delft, Netherlands
2Politecnico di Milano, Milan, Italy

Current passage is used in repair techniques for concrete structures suffering from corrosion, like Cathodic Protection (CP).

A mathematical description of ion transport in concrete due to current passage, including the heterogeneous equilibrium involving solid Ca(OH)2 determining the acidity/alkalinity was developed and implemented in COMSOL Multiphysics.

From the first modeling results a qualitative model of concrete acidification due to Cathodic Protection could be derived.