###### Abstract  
This paper aims to present a non-destructive magnetic method developed for simultaneously identifying key parameters in reinforced concrete (RC) structures. This method is designed to evaluate concrete structures containing dense reinforcement meshes. The development process of the system is presented step by step. First, the hardware layer of the system is discussed and documented. The proposed modifications to the excitation system enhanced the method's effectiveness compared to the conventional Magnetic Flux Leakage (MFL) technique. Next, this paper presents the extracted association rules that connect the parameters of the RC structure to the properties of resultant waveforms. The relations are verified with measurement results. Finally, the identification of the model's design, implementation, and deployment processes are presented. A universal methodology for non-destructive testing investigations was developed and is described throughout the research.  
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Footnote †: journal: Applied sciences  
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commonplace and contributing to enhanced safety. Therefore, developing new NDT (non-destructive testing) methods designed to inspect RC structures is an issue of high practical importance [1; 2; 3; 4].  
Currently, only electromagnetic and some mechanical techniques are suitable for the direct, non-destructive evaluation of reinforcing bars [3; 4; 5; 6; 7; 8]. Mechanical methods are more universal, while electromagnetic techniques are dedicated mainly to testing metal elements (like rebars). Among electromagnetic techniques, the eddy current (EC) method is frequently regarded as the preferred approach for assessing RC structures. However, in recent years, advancements in magnetic sensor technology have led to a significant increase in the popularity of magnetic methods. Systems of this kind are easier to implement and more cost-effective than EC techniques [3; 4]. One of the most promising techniques from the magnetic group is the Magnetic Flux Leakage (MFL) method [3; 4]. The MFL is used for rebar detection and the mapping of the entire reinforcement grid [3; 4; 7; 8; 9; 10; 11; 12; 13].  
Additionally, it can be utilized to detect corrosion in post-tensioned and precast prestressed strands in concrete girders or other forms of reinforcement damage [3; 4; 14; 15; 16; 17; 18]. In some instances, the MFL method has also been applied to ascertain the thickness of the concrete cover [7; 8; 9; 10] and the diameter of the reinforcing bars [7; 8; 9; 10] or to classify the grade of rebar steel [7; 8]. However, simultaneously identifying all three fundamental parameters (\(h\), \(D\), and class) with this method presents a severe challenge. Another critical issue is the identification of the parameters for a specific rebar situated within a reinforcement grid. The typical edge of the eye in mesh reinforcement ranges from 10 to 20 cm. Simulations, preliminary magnetic measurements, and previous studies [6; 19] have demonstrated that this distance is only sometimes adequate to ensure that the influence of adjacent bars on measurement outcomes is negligible. The interaction between neighboring rebars can distort the obtained results and lead to erroneous classifications. This paper aims to present a magnetic method that is designed to solve both of these problems.