- ISSN 0258-2724
- CN 51-1277/U
- EI Compendex
- Scopus
- Indexed by Core Journals of China, Chinese S&T Journal Citation Reports
- Chinese S&T Journal Citation Reports
- Chinese Science Citation Database
| Citation: | JIANG Shenghua, HOU Jianguo, HE Yingming. Steel Corrosion Monitoring Based on Partial Modulus of Magnetic Gradient Tensor[J]. Journal of Southwest Jiaotong University, 2021, 56(6): 1176-1184. doi: 10.3969/j.issn.0258-2724.20191174
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In order to find a nondestructive and quantitative monitoring method for steel corrosion in reinforced concrete, theoretical formulas of the partial modulus and corrosion rate of rebar are derived with consideration of the influence of the Earth’s background magnetic field and environmental interference magnetic field. Accelerated corrosion tests were performed on 8 steel bars through electrification to obtain specimens with different degrees of corrosion. A rebar corrosion monitoring system was then developed to measure the magnetic field intensity of rebar before and after corrosion. Finally, the partial modulus of the magnetic gradient tensor is used to calculate the corrosion rate of the rebar. Results show that the magnetic field intensity curve of the rebar is generally shifted after corrosion, but the absolute value after corrosion may increase or decrease compared with that before corrosion, without consistency. The absolute value of the magnetic gradient and the average value of the partial modulus of the steel bar after corrosion are less than their counterparts before corrosion. In the magnetic monitoring of rebar corrosion, the magnetic gradient and partial modulus of the rebar are much larger than those of the environmental magnetic field, and therefore the gradient of the environmental magnetic field and its partial modulus are negligible. The minimum error between calculated and measured corrosion rates of the 8 specimens is 0.22%, while the maximum error is 9.40%, and the average error is 3.92%, with a standard deviation of 3.32%.
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