Modeling Simulated Concrete Durability Problems with Double Layer Theory

H. Bernardes[1], M. Mancio[2], and P. Monteiro[3]
[1]Sao Paulo State University - UNESP, Ilha Solteira, SP, Brazil
[2]Federal University of Rio Grande do Sul, Porto Alegre, RS, Brazil
[3]University of California, Berkeley, CA, USA

According to the Gouy-Chapman theory, a double layer structure appears on the surface of a solid particle, a gas bubble, a liquid droplet, or a porous body when it is placed into a liquid.

In this work, a one-dimensional model of the electrochemical reactions has been developed in the COMSOL Multiphysics environment. The model accounts for solution chemistry, cell potential, and solves the related mass, momentum and energy balances. Discussion of the simulation is based on some experimental results indicating that important passive film characteristics vary considerably depending on solution pH and ionic strength.