Structure health monitoring of concrete structures using magnetic flux leakage

Zhang, Y.H.; Wang, Q.; Huang, S.L.

Abstract

Reinforcing bar, usually made of steel, is widely used in civil structures to increase the tensile strength of concrete. Heatinduced delayed expansion and corrosion expansion resulting in rust occupies a greater volume than rebar. This expansion creates tensile stress in the concrete which can eventually cause cracking, delamination and spalling. Non-destructive testing (NDT) is a testing technology that detects the presence of defects in the material or detects the physical or mechanical properties of the material without destroying the material. In this paper, the emergence, development and application of magnetic flux leakage testing technology are presented. The principle and working process of three-valved open electromagnetic coil magnetic flux leakage detection devices is used for rebar defect detection, as well as introducing the design method of its main components. The three-valved open electromagnetic coil magnetic flux leakage detection method is optimized through simulating the variation of magnetic flux density and detection defects between different magnetizer radii. The test results show that compared to other detection methods the three-valved magnetizer has the ability to detect rebar defects with high precision, and as the radius of the magnetizer increases, the magnetization of the steel bars in the central magnetizer area of the magnetizer gradually attenuates, and the amplitude of the detection signal also decreases, showing the characteristic of slow decay.

Citation

Zhang, Y., Wang, Q., & Huang, S. (2022, December). Structure health monitoring of concrete structures using magnetic flux leakage. Presented at The 7th International Conference on Civil Structural and Transportation Engineering (ICCSTE'22), Niagara Falls, Canada

• Presentation Conference Type: Conference Paper (published)
• Conference Name: The 7th International Conference on Civil Structural and Transportation Engineering (ICCSTE'22)
• Acceptance Date: Mar 26, 2022
• Online Publication Date: Jun 6, 2022
• Publication Date: 2022
• Deposit Date: Sep 7, 2022
• Publicly Available Date: Sep 9, 2022
• DOI: https://doi.org/10.11159/iccste22.214
• Public URL: https://durham-repository.worktribe.com/output/1136807
• Publisher URL: https://avestia.com/ICCSTE2022_Proceedings/files/paper/ICCSTE_214.pdf