Identification of rebars in a reinforced mesh using eddy current method

Abstract

Abstract. The aim of this paper is to present an expert system for identification of the basic reinforcement concrete structures parameters like: rebars diameter, thickness of a concrete cover and a kind of rebar's alloy (class). The results of measurement carried out by the eddy current transducers were utilized for the designed system. Measured waveforms are represented by two kinds of attributes, the d-factors represent a waveform shape, and a maximal amplitude. In order to extract an association rules between the specific attributes and the structure parameters a rough set theory was used.

Assessment of the concrete part of the contact system supports in the field

“…To date, the causes of crack formation in reinforced concrete supports have been well studied [6][7][8][9][10][11].…”

Detection and Inspection of Steel Bars in Reinforced Concrete Structures Using Active Infrared Thermography with Microwave Excitation and Eddy Current Sensors

“…The eddy current method uses the phenomena of electromagnetic induction to detect inner flaws or inclusions in the examined materials. This method is a natural choice in the case of conducting materials and the possibility of using it in rebar detection has been discussed earlier [ 34 , 35 , 36 , 37 ]. Here we present the multi-frequency technique and we propose a method that may be used for the problem of identification of chosen parameters of the rebar on the basis of obtained signals.…”

“…The system utilized was presented in previous work [ 34 , 35 ]. It consists of an E-shaped differential transducer ( Figure 12 b) and four subsystems: an XYZ scanner, an excitation subsystem, a data acquisition subsystem and a controlling computer.…”

“…During this investigations the assessment of distance between the ferromagnetic material and transducer was considered the simplest task ( Figure 13 ). However like with SFM, the set of most useful attributes was selected and association rules were inferred [ 35 , 36 ]. Rough set theory was used for this purpose [ 38 , 39 ].…”

Impact of Magnetization on the Evaluation of Reinforced Concrete Structures Using DC Magnetic Methods

“…The electromagnetic methods may be used to localize rebars in the structure, precisely estimate basic structure parameters (such as the thickness of the concrete cover, the rebar’s diameter, the rebars class [ 8 , 9 , 10 ], and detect corrosion or other flaws [ 11 , 12 , 13 ]). The most significant advantages of the methods from this group are the direct impact on reinforcement, the low damping of electromagnetic waves by concrete and the high spectrum of frequencies that can be used.…”