Determination of chloride diffusion coefficient in cement-based materials - A review of experimental and modeling methods: Part III - EIS based methods

: Szyszkiewicz K, Jasielec JJ, Krolikowska A, Filipek R

Publisher: STOWARZYSZENIE PRODUCENTOW CEMENTU

: 2017

: Cement Wapno Beton

: CEMENT WAPNO BETON

: CEM WAPNO BETON

: 22

: 3

: 219

: 229

: 12

: 1425-8129

: http://cementwapnobeton.pl/pdf/2017/2017_3/Filipek_3_2017.pdf

The corrosion of steel reinforcement (rebars) in concrete structures is a severe durability and safety problem. One of the most aggressive chemical species which induces such corrosion is the chloride ion via the general mechanism of depassivation of the rebar surface. Chloride ions can diffuse through the solution of pore system in concrete to reach the rebar, thus the assessment of the diffusion coefficient of chloride in concrete is of paramount importance. This paper is the last part of a series of three papers which are meant to provide an overview of experimental methods and theoretical models which are used to predict a concrete materials resistivity to chloride ingress. Part 3 deals with methods based on electrochemical impedance spectroscopy. It is relatively new method which allows to determine the diffusion coefficient in real-time, and in consequence to quantify its variation over time. If the impedance experiment is carried out in full frequency range it will produce not only the diffusion coefficient but also the microstructure parameters of cementitious materials.