Diffusion potentials in non-saturated, porous mineral materials – error and information source
Final Report Abstract
This research study successfully improved the understanding of diffusion potentials in porous mineral materials, particularly in cement-based materials. The diffusion potentials occur in porous materials with ion concentration differences in the pore solution (chloride, pH). However, the diffusion potentials may have a significant effect on half-cell potential measurements in research and practice (error source). Therefore, it is important to accurately predict the diffusion potentials. The aim of this research study was to develop a predictive tool on the basis of experiments and numerical simulations. The research study covered the effect of ion concentration differences present in the pore solution, the pore size, the moisture condition of the porous material, their permselective behavior and chemical reactivity on the arising diffusion potentials. Furthermore, the improved understanding allowed to utilize the diffusion potentials as a means of gaining information about the porous material under study (information source).
Publications
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Diffusion potentials as source of error in the potential measurements in reinforced concrete structures - State of the knowledge and perspectives. European Corrosion Congress (virtual)
Ziehensack, E.; Osterminski, K. & Gehlen, C.
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Diffusion potentials in saturated hardened cement paste upon chloride exposure. Materials and Structures, 56(5).
Ziehensack, Elke; Keßler, Sylvia; Angst, Ueli; Hilbig, Harald & Gehlen, Christoph
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Impact of diffusion potentials in porous materials on corrosion-related investigations - Insight into the research project. Swiss Corrosion Science Day, Zurich
Ziehensack, E.; Gehlen, C.; Osterminski, K.; Angst, U.; Zhang, Z.; Schmid, T.
