A new judging criterion for corrosion testing of reinforced concrete based on self-magnetic flux leakage

Zhang, Zeyu; Liao, Leng; Zhao, Ruoxi; Zhou, Jianting; Yang, Mao; Zhao, Yayu

doi:10.3233/jae-160122

Cited by 22 publications

(10 citation statements)

References 17 publications

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“…In actual structures, the corrosion depth is obtained from regular testing. Many methods of corrosion depth testing have been proposed and applied to actual structures [30,31]. erefore, we need to find out the relationship between natural frequencies and corrosion depth.…”

Section: Analysis Of the Relationship Between The Natural Frequency And Corrosion Depthmentioning

confidence: 99%

Experimental Study on the Relationship between the Natural Frequency and the Corrosion in Reinforced Concrete Beams

Zhang

Sun

Dong³

2021

Advances in Materials Science and Engineering

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Due to many nondamage factors such as temperature, humidity, carbonation, and corrosion effects on natural frequency, the key problem of the application frequency-based method to detect damage is to reveal the rules of these factors affect natural frequency and further to eliminate their effects. The long-term characteristics of reinforced concrete structures require a lot of attention, especially in corrosive environment. In this paper, an experimental investigation was conducted to study the deflection and natural frequency of reinforced concrete beam in a marine environmental chamber for six corrosion stages (accelerated corrosion for 0, 20, 40, 70, 100, and 140 days). The experimental results demonstrated that deflection increases with corrosion time, while natural frequency decreases with corrosion time. Based on the accelerate corrosion test data of reinforced concrete beams, the general expression of the relationship between corrosion depth and natural frequency has been established through the fitting curve method. The polynomial model has been selected for establishing the relationship between steel corrosion depth (including the main reinforcement and stirrup) and natural frequency. The reason for selecting the polynomial model is that the sum of squares due to error (SSE) is closer to 0 and the coefficient of multiple determination (R-square) is closer to 1. This investigations help to discriminate the cause of reinforced concrete beams natural frequency change, to eliminate nondamage factors affects, and to apply many structural damage identification methods effectively.

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Section: Analysis Of the Relationship Between The Natural Frequency And Corrosion Depthmentioning

confidence: 99%

Experimental Study on the Relationship between the Natural Frequency and the Corrosion in Reinforced Concrete Beams

Zhang

Sun

Dong³

2021

Advances in Materials Science and Engineering

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“…The equivalent magnetic dipole is a physical model commonly used in the theoretical study of the mechanism of SMFL signal of the ferromagnet [ 22 , 27 , 36 ]. According to the equivalent magnetic charge theory, the exterior magnetic field including SMFL would be considered to originated from the magnetic charge: ρ = −∇ M .…”

Section: Experimental Details and Theoretical Backgroundmentioning

confidence: 99%

“…Liu [ 23 , 24 , 25 ] established a full electronic potential magneto-mechanical model of the ferromagnetic material and explored the relationship between magnetic memory signal and the stress concentration defects. Zhang [ 26 , 27 ] studied the relationship between the SMFL signals and the corrosion extent of corroded reinforced concrete. Zhang [ 28 ] investigated the fundamental relationship between corrosion rate and magnetic induction surrounding steel reinforcement.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Residual Bending Strength of Corroded Reinforced Concrete Beam Based on Micromagnetic Sensor

Zhou

Qiu

Zhou³

et al. 2018

Sensors

Self Cite

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This paper presents a nondestructive test method to evaluate the residual bending strength of corroded reinforced concrete beam by analyzing the self-magnetic flux leakage (SMFL) signals. The automatic scanning device was equipped with a micromagnetic sensor and sensor-based experimental details were introduced. Next, the theoretical formula of the normal component HS(z) of the SMFL signal that originated from the corroded region was derived based on the magnetic dipole model and the experimental results were discussed. The results indicate that the experimental data of HS(z) are consistent with the theoretical calculations, both location and extent of the steel bars corrosion can be qualitatively determined by using HS(z). The gradient K of HS(z) is approximately linearly related to the loss rate, S, of the bending strength, which can be used to evaluate the residual bending strength of the corroded reinforced concrete beam. This work lays the foundation for evaluating the residual bending strength of corroded reinforced concrete beams using the SMFL signal; the micromagnetic sensor is further applied to the civil engineering.

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“…Although these methods have significantly improved the detection of steel corrosion, certain restrictions exist for their widespread use. For example, the analytical method relies on a reasonable and reliable predictive model for assessing steel corrosion [15], while the electrochemical method can calibrate the corrosion rate but cannot detect the corrosion quantity of the steel bar [16,17]. Thus, a more effective and convenient technology for corrosion detection is urgently required.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Heating Technique of Deformed Reinforcement Using High-Frequency Induction Heating System

Lim

Lee

2021

Applied Sciences

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To improve recycling quality, it is necessary to develop a demolition technology that can be combined with existing crushing methods that employ large shredding-efficient equipment. The efficient collection of bones in a segmentation dismantling method must be considered according to the procedure. Furthermore, there is a need for the development of partial dismantling technologies that enable efficient remodeling, maintenance, and reinforcement. In this study, we experimentally investigated the temperature-rise characteristics of reinforced concrete through partial rapid heating during high-frequency induced heating. Accordingly, the chemical and physical vulnerability characteristics of the reinforced concrete were verified by studying the thermal conduction on the surface of the rebars and the cracks caused by the thermal expansion pressure of the rebars. Furthermore, we aimed to verify the applicability of the proposed technology by specifying the vulnerability range of the reinforced concrete based on the heating range, as well as the appropriate energy consumption. We investigated the temperature rise and temperature distribution characteristics of the rebar surfaces based on diameter, length, bar placement conditions, heating distance, heating coil location, and output, using reinforced steel of grade SD345. Maximum powers of 5, 6, and 10 kW, and inductive heating were used to achieve satisfactory results.

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A new judging criterion for corrosion testing of reinforced concrete based on self-magnetic flux leakage

Cited by 22 publications

References 17 publications

Experimental Study on the Relationship between the Natural Frequency and the Corrosion in Reinforced Concrete Beams

Experimental Study on the Relationship between the Natural Frequency and the Corrosion in Reinforced Concrete Beams

Experimental Study on Residual Bending Strength of Corroded Reinforced Concrete Beam Based on Micromagnetic Sensor

Evaluation of Heating Technique of Deformed Reinforcement Using High-Frequency Induction Heating System

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