Effect of different magnetic field intensities on the corrosion of steel rebar embedded in concrete incorporating silica fume, exposed to corrosive environment

Articles in Press

Document Type : Research Paper

Authors

1 Ph.D. Student in Structural Eng., Faculty of Engineering, University of Guilan, Rasht, Iran

2 Prof. in Structural Eng., Faculty of Engineering, University of Guilan, Rasht, Iran

3 Ph.D., Faculty of Engineering, University of Guilan, Rasht, Iran

4 Postdoctoral in Structural Eng., Faculty of Engineering, University of Guilan, Rasht, Iran

10.22124/jcr.2025.30949.1706

Abstract

Since direct application of a magnetic field to fresh concrete improves its engineering properties, magnetic treatment is also expected to enhance the durability of concrete in a corrosive environment. Given the limited research on steel rebar corrosion rates in magnetically treated concrete, this study investigates the effects of different magnetic field intensities (0.5, 0.8, and 1 T) on the mechanical properties and durability of concrete containing 5% and 10% silica fume. Furthermore, the microstructure of magnetically treated concrete was evaluated using Scanning Electron Microscopy (SEM) images. The results demonstrated that applying a 1 T magnetic field to concrete incorporating 10% silica fume reduced embedded steel rebar corrosion by up to 17%. In addition, compressive strength of concrete exposed to magnetic field of 1 T increased by about 24%. Additionally, final water absorption and porosity of the concrete decreased by up to 14% and 18%, respectively. The SEM analysis revealed that magnetic field exposure affects the hydration process of cement materials, increasing the amount of calcium silicate hydrate (C-S-H) gel.

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Main Subjects

Concrete Research

Articles in Press, Accepted Manuscript
Available Online from 04 October 2025

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