Effects of DC Stray Current on Concrete Structure

Document Type : Research Article


1 Assistant Professor, Subsea R&D Center, Isfahan University of Technology

2 Professor, Department of Materials Eng., Isfahan University of Technology

3 Associate Professor, Department of Materials Eng., Isfahan University of Technology

4 Lecturer, Subsea R&D Center, Isfahan University of Technology


In this article, effects of DC stray current on concrete structures were studied in chloride free environments. In this article, effects of potential of DC stay current on permeability of concrete in chloride-free aqueous medium were studied. For this purpose, concrete samples with different w/c ratio and silica fume content were subjected to 50 VDC in distilled water for 30 days. The effects of DC stray current on the properties of concrete were determined by resistivity, Electrochemical Impedance Spectroscopy (EIS) and electrical permeability test. The results clearly showed the negative influence of DC stray current on the permeability of the concrete. The critical role of w/c ratio and silica fume additive on the degradation effects created by DC stray current was revealed. Migration mechanism of Ca(OH)2 of concrete under DC stray current was proposed. This process increases pores sizes distribution and creates new pores network in concrete and so increases its permeability. Decreasing w/c or adding silica fume to concrete mix design increase stability of concrete against increasing its permeability by effects of DC stray current.


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