Inspection of rebars in concrete blocks

Perin, Deniz; Göktepe, Mustafa

doi:10.3233/jae-2012-1409

Cited by 9 publications

(2 citation statements)

References 10 publications

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“…Ultrasonic method [1,2], X-ray method [3,4], magnetic flux leakage (DC field) method [5][6][7], electromagnetic induction (AC field) method [8][9][10][11][12][13], microwave radar system [14][15][16], and thermography technology [17][18] have been used to evaluate the break, the location, or the corrosion of the steel rebar in concrete.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Steel Rebar in Concrete Using Electromagnetic Method

He¹

2019

Failure Analysis

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The corrosion of steel reinforcing bar (rebar) is the leading cause of deterioration of concrete. In Japan, many railway bridges were built 40 years ago. It is necessary to develop easy-operation method to evaluate the corrosion of steel rebar. A project about the corrosion evaluation of steel rebar was started in 2015. In this project, we have two objectives: one is to evaluate the depth and the diameter of steel rebar in concrete; another is to evaluate the corrosion of steel rebar in concrete. We developed electromagnetic methods to do nondestructive evaluation of the steel reinforcing bar (rebar) in concrete. Using two probes and lower excitation frequencies of 3.8 and 4.2 kHz, the depth and the diameter of the steel reinforcing bar can be evaluated. Using higher excitation frequency of about 80 kHz, and the X, Y signals of the lock-in amplifier, where the X signal is the same phase signal with the AC excitation magnetic field and Y signal is the 90°phase different signal with the AC excitation magnetic field, we could evaluate the corrosion of steel rebar. A compact system with low power consumption of 0.5 W was developed, and we also did some field experiments using this system.

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Section: Introductionmentioning

confidence: 99%

Evaluation of Steel Rebar in Concrete Using Electromagnetic Method

He¹

2019

Failure Analysis

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“…Ultrasonic pulse velocity (UPV) or Schmidt hammer techniques assess the mechanical properties of concrete with no information directly related to rebar corrosion [27]. Similarly, radiographic and acoustic inspections can assess concrete conditions, but give no direct information related to rebar conditions [28].…”

Section: Introductionmentioning

confidence: 99%

Simulation of Real Defect Geometry and Its Detection Using Passive Magnetic Inspection (PMI) Method

2018

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Reinforced concrete is the most commonly used material in urban, road, and industrial structures. Quantifying the condition of the reinforcing steel can help manage the human and financial risks that arise from unexpected reinforced concrete structure functional failure. Also, a quantitative time history of reinforcing steel condition can be used to make decisions on rehabilitation, decommissioning, or replacement. The self-magnetic behavior of ferromagnetic materials is useful for quantitative condition assessment. In this study, a ferromagnetic rebar with artificial defects was scanned by a three-dimensional (3D) laser scanner. The obtained point cloud was imported as a real geometry to a finite element software platform; its self-magnetic behavior was then simulated under the influence of Earth’s magnetic field. The various passive magnetic parameters that can be measured were reviewed for different conditions. Statistical studies showed that 0.76% of the simulation-obtained data of the rebar surface was related to the defect locations. Additionally, acceptable coincidences were confirmed between the magnetic properties from numerical simulation and from experimental outputs, most noticeably at hole locations.

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