Resistivity measuring device, method, electronic device and storage medium for reinforced concrete bars

Abstract

This disclosure provides a resistivity measuring device, method, electronic device, and storage medium for reinforced concrete members, relating to the fields of electrical engineering and building engineering. The device includes: a plurality of electrodes equally spaced on a first surface of the concrete member, including: at least two working electrodes arranged at the beginning and end of the plurality of electrodes, the working electrodes being electrically connected to a power source; at least two intermediate electrodes arranged between the at least two working electrodes; a measuring device electrically connected to the at least two intermediate electrodes, configured to measure a target potential difference between the at least two intermediate electrodes; a processor module configured to process the target potential difference and the current value of the detected current based on a resistivity simulation function to obtain a resistivity simulation value; and to determine the resistivity of the concrete member based on a size correction factor associated with the structural dimensions of the concrete member and the resistivity simulation value.

Description

Technical Field

[0001] This disclosure relates to the fields of electrical engineering and building engineering, and more specifically, to a resistivity measuring device, method, electronic device, and storage medium for reinforced concrete members. Background Technology

[0002] Concrete poles can be slender concrete structures such as concrete utility poles. The resistivity of concrete poles is closely related to indicators such as chloride ion permeability and component cracking. Therefore, the ability to quickly and accurately measure the resistivity of concrete poles on-site has a significant impact on the construction and maintenance processes of building engineering, electrical engineering, and other related projects. However, methods for resistivity testing of concrete poles typically have low accuracy. Summary of the Invention

[0003] In view of this, the present disclosure provides a resistivity measuring device, method, electronic device and storage medium for reinforced concrete members.

[0004] One aspect of this disclosure provides a resistivity measuring device for reinforced concrete members, comprising: a plurality of electrodes equally spaced on a first surface of the concrete member, including: at least two working electrodes arranged at the beginning and end of the plurality of electrodes, the working electrodes being electrically connected to a power source; at least two intermediate electrodes arranged between the at least two working electrodes; a measuring device electrically connected to the at least two intermediate electrodes, the measuring device being configured to measure a target potential difference between the at least two intermediate electrodes when the power source provides a detection current to the at least two working electrodes; a processor module configured to process the target potential difference and the current value of the detection current based on a resistivity simulation function to obtain a resistivity simulation value; and to determine the resistivity of the concrete member based on a size correction factor associated with the structural dimensions of the concrete member and the resistivity simulation value, wherein the size correction factor is determined based on the sample resistivity corresponding to simulated members with different simulated structural dimensions.

[0005] Another aspect of this disclosure provides a method for measuring the resistivity of reinforced concrete members, applied to the resistivity measuring device for reinforced concrete members described above. The method includes: processing the target potential difference and the current value of the detection current based on a resistivity simulation function to obtain a simulated resistivity value; determining the resistivity of the concrete member based on a size correction coefficient associated with the structural dimensions of the concrete member and the simulated resistivity value, wherein the size correction coefficient is determined based on the sample resistivity corresponding to simulated members with different simulated structural dimensions.

[0006] Another aspect of this disclosure provides an electronic device comprising:

[0007] One or more processors;

[0008] Memory, used to store one or more programs.

[0009] When the above one or more programs are executed by the above one or more processors, the above one or more processors implement the above method.

[0010] Another aspect of this disclosure provides a computer-readable storage medium storing computer-executable instructions, which, when executed, are used to implement the method described above.

[0011] Another aspect of this disclosure provides a computer program product including computer-executable instructions that, when executed, implement the method described above.

[0012] According to embodiments of this disclosure, by correcting the measured simulated resistivity value using a size correction factor, the problem of low resistivity measurement accuracy of concrete rods due to polarization error under target potential difference and detection current conditions can be corrected. This enables accurate measurement of the resistivity of concrete rods in a non-destructive state, improving the measurement efficiency and accuracy of resistivity. Attached Figure Description

[0013] The above and other objects, features and advantages of this disclosure will become clearer from the following description of embodiments with reference to the accompanying drawings, in which:

[0014] Figure 1A A schematic diagram of a resistivity measuring device for reinforced concrete members, which can be applied according to this disclosure, is shown.

[0015] Figure 1B The schematic diagram illustrates the working principle of a resistivity measuring device for reinforced concrete members according to embodiments of the present disclosure.

[0016] Figure 2 The illustration schematically depicts an application scenario of a resistivity measuring device for reinforced concrete members according to an embodiment of this disclosure.

[0017] Figure 3 The diagram schematically illustrates an application scenario of a resistivity measuring device for reinforced concrete members according to another embodiment of this disclosure.

[0018] Figure 4 A block diagram of an electronic device suitable for implementing a resistivity measurement method for reinforced concrete members, according to an embodiment of the present disclosure, is shown schematically. Detailed Implementation

[0019] The embodiments of the present disclosure will now be described with reference to the accompanying drawings. However, it should be understood that these descriptions are exemplary only and are not intended to limit the scope of the disclosure. In the following detailed description, numerous specific details are set forth to provide a thorough understanding of the embodiments of the present disclosure for ease of explanation. However, it will be apparent that one or more embodiments may be practiced without these specific details. Furthermore, descriptions of well-known structures and techniques are omitted in the following description to avoid unnecessarily obscuring the concepts of the present disclosure.

[0020] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit this disclosure. The terms “comprising,” “including,” etc., as used herein indicate the presence of the stated features, steps, operations, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, or components.

[0021] All terms used herein (including technical and scientific terms) have the meanings commonly understood by those skilled in the art, unless otherwise defined. It should be noted that the terms used herein are to be interpreted in a manner consistent with the context of this specification, and not in an idealized or overly rigid way.

[0022] When using expressions such as "at least one of A, B and C", they should generally be interpreted in accordance with the meaning that is commonly understood by those skilled in the art (e.g., "a system having at least one of A, B and C" should include, but is not limited to, a system having A alone, a system having B alone, a system having C alone, a system having A and B, a system having A and C, a system having B and C, and / or a system having A, B and C, etc.).

[0023] In the embodiments disclosed herein, the collection, updating, analysis, processing, use, transmission, provision, disclosure, and storage of data (e.g., including but not limited to user personal information) comply with relevant laws and regulations, are used for legitimate purposes, and do not violate public order and good morals. In particular, necessary measures have been taken to prevent unauthorized access to user personal information data and to safeguard user personal information security, network security, and national security.

[0024] In the embodiments disclosed herein, user authorization or consent is obtained before acquiring or collecting user personal information.

[0025] The inventors discovered that resistivity testing methods for slender reinforced concrete beam-column members, such as utility poles, top chords, and bottom chords, suffer from low accuracy. This is particularly true when unidirectional, single-layer reinforcement is present along the length of the member. During testing, the small width and height of the member significantly affect the accuracy of the concrete resistivity measurements, further impacting the assessment of actual corrosion, chloride ion penetration, and crack development. Therefore, the influence of the Wenner technology's electrode placement parallel to the reinforcement direction in these special member conditions must be considered to obtain reliable test results. After adjustment, the resistivity measurements for slender reinforced concrete beam-column members approach the actual values. The average error without adjustment was 41.48%, while the adjusted average error was only 1.87%. This adjusted testing technique broadens the application range of Wenner technology for resistivity testing.

[0026] To address the low accuracy and other limitations of traditional resistivity testing methods, a novel testing method for reinforced concrete structures, the Wenner technique, is proposed. The Wenner technique is increasingly becoming the preferred choice for resistivity testing in both laboratory and field applications due to its ability to effectively avoid electrode polarization errors and its advantages of being non-destructive, safe, rapid, and compact. However, since the Wenner technique is based on the assumption that the material is semi-infinite, isotropic, and homogeneous, the significant resistivity difference between concrete and reinforcing steel means that the concrete no longer satisfies the isotropic and homogeneous medium assumptions. Current always flows through the path of least resistance, leading to a non-uniform current field distribution and even current concentration.

[0027] The embodiments of this disclosure provide a resistivity measuring device, method, electronic device, and storage medium for reinforced concrete members, which at least partially solves the electrode polarization error in resistivity measurement and enables non-destructive testing of concrete members.

[0028] One embodiment of this disclosure discloses a resistivity measuring device for reinforced concrete members, comprising: multiple electrodes, a measuring device, and a processor module.

[0029] According to embodiments of this disclosure, a plurality of electrodes are equally spaced on the first surface of a concrete member. The plurality of electrodes includes at least two working electrodes and at least two intermediate electrodes.

[0030] At least two working electrodes are arranged at the beginning and end of multiple electrodes, and the working electrodes are electrically connected to the power supply.

[0031] At least two intermediate electrodes are arranged between at least two working electrodes.

[0032] According to embodiments of the present disclosure, the measuring device is electrically connected to at least two intermediate electrodes and is configured to measure a target potential difference between at least two intermediate electrodes when a power supply provides a detection current to at least two working electrodes.

[0033] According to embodiments of this disclosure, the processor module is configured to process the target potential difference and the current value of the detected current based on the resistivity simulation function to obtain the resistivity simulation value; and to determine the resistivity of the concrete member based on the size correction coefficient associated with the structural dimensions of the concrete member and the resistivity simulation value.

[0034] According to embodiments of this disclosure, the size correction factor is determined based on the sample resistivity of each simulated rod with different simulated structural dimensions.

[0035] According to embodiments of this disclosure, concrete poles can include any type of pole. For example, they can be poles for slender concrete utility poles of the beam-column type. However, they are not limited to this and can include other types of concrete poles. Embodiments of this disclosure do not limit the specific type of concrete pole.

[0036] Figure 1A A schematic diagram of a resistivity measuring device for reinforced concrete members, which can be applied according to this disclosure, is shown.

[0037] Figure 1B The schematic diagram illustrates the working principle of a resistivity measuring device for reinforced concrete members according to embodiments of the present disclosure.

[0038] Combination Figure 1A and Figure 1B As shown, the resistivity measuring device for reinforced concrete members may include a first working electrode 111, a second working electrode 114, a first intermediate electrode 112, and a second intermediate electrode 113, as well as a potential digital sensor 121 and a processor module 130 as the measuring device. The processor module 130 may include a microcontroller and a host computer. The first working electrode 111, the first intermediate electrode 112, the second intermediate electrode 113, and the second working electrode 114 are arranged on the first surface 141 of the concrete member 140 based on an electrode spacing s. The processor module 130 can control the power supply to provide a detection current to the first working electrode 111 and the second working electrode 114. The potential digital sensor 121 can measure the target potential difference between the first intermediate electrode 112 and the second intermediate electrode 113, and the target potential difference can be output to the processor module 130.

[0039] like Figure 1B As shown, after providing detection current to the first working electrode 111 and the second working electrode 114, the current lines and voltage equipotential lines in the concrete rod 140 can be represented by solid curves and dashed curves, respectively.

[0040] Processor module 130 processes the target potential difference and the current value of the detected current based on the resistivity simulation function to obtain the resistivity simulation value; based on the size correction coefficient k1 associated with the structural dimensions of the concrete member and the resistivity simulation value ρ s Determine the resistivity ρ of the concrete member t .

[0041] According to embodiments of this disclosure, the multiple electrodes may be Wenner electrodes, and the multiple electrodes may be arranged in the central region of the first surface of the reinforced concrete member to be tested, or in the region near the central region of the first surface.

[0042] According to embodiments of this disclosure, conductive paste can be applied to the contact area between the first surface of the reinforced concrete member and the plurality of electrodes. For example, the conductive paste can be applied evenly.

[0043] In one example, by performing multiple resistivity measurements on the concrete member, the processor module can determine multiple resistivities, and the resistivity of the concrete member is obtained by determining the average of the multiple resistivities.

[0044] In one example, a reinforced concrete member can be a slender concrete block with components such as reinforcing bars.

[0045] According to embodiments of this disclosure, by using a size correction factor to correct the measured simulated resistivity value, the resistivity measurement error of the concrete rod under the conditions of target potential difference and detection current can be corrected, enabling accurate measurement of the resistivity of the concrete rod in a non-destructive state, thereby improving the measurement efficiency and accuracy of resistivity.

[0046] According to embodiments of this disclosure, the size correction factor can be obtained by looking up a table. For example, the associated sample size factor and sample concrete member size can be stored in a table, and the size correction factor can be obtained by looking up the size of the concrete member in the table.

[0047] According to embodiments of this disclosure, the processor module is configured to: determine an initial simulated resistivity value based on the ratio between the target potential difference and the current value of the detected current; and determine a simulated resistivity value based on the initial simulated resistivity value and the electrode spacing between two different electrodes.

[0048] In one example, the initial simulated resistivity value can be expressed as: , among which, U 23 The target potential difference is represented by I, and the current value of the detection current is represented by ρ. The simulated resistivity value is also shown. s It can be determined based on the following formula (1).

[0049] (1).

[0050] Where s represents the electrode spacing between two different electrodes, for example, it can be represented as the electrode spacing between two intermediate electrodes.

[0051] Resistivity ρ of concrete members t It can be determined based on the following formula (2).

[0052] (2).

[0053] Where k1 is the size correction factor.

[0054] According to embodiments of this disclosure, the size correction factor is determined from a plurality of simulated size correction factors based on the structural dimensions.

[0055] According to embodiments of this disclosure, the simulation size correction factor is determined based on the following operations: for the simulation rod in the simulation rod, determining the simulation size ratio relationship between multiple different first simulation structural dimensions; determining the first simulation target potential difference of the first simulation rod under the condition of receiving simulation current; processing the first simulation target potential difference based on the resistivity simulation function to obtain the first simulation resistivity simulation value; and determining the simulation size correction factor corresponding to the simulation size ratio relationship based on the ratio between a preset reference resistivity and the first simulation resistivity simulation value.

[0056] According to embodiments of this disclosure, determining the simulated target potential difference of a simulated rod under the condition of receiving a simulated current includes: obtaining the simulated potential difference by solving the control equation and boundary conditions based on the simulated current.

[0057] According to embodiments of this disclosure, boundary conditions are used to constrain the current density vector on the surface of the simulated rod to zero, and the control equation is used to control the product of the gradient of the simulated target potential difference and the gradient of the simulated conductivity of the simulated rod to satisfy a preset equilibrium condition with the product of the second gradient of the simulated target potential difference and the simulated conductivity.

[0058] According to embodiments of this disclosure, the simulated rod may include a first simulated rod, and the simulated target potential difference may include a first simulated target potential difference.

[0059] According to embodiments of this disclosure, the control equation can be expressed based on formula (3), and the boundary conditions can be expressed based on formula (4).

[0060] (3);

[0061] n∙J=0 (4).

[0062] Where ρ is the simulated resistivity of the simulated rod, V can represent the simulated target potential difference, n is the normal vector of the simulated rod surface, and J is the current density vector of the closed surface within the simulated rod domain. It should be understood that the simulated rod surface can correspond to the first surface; for example, it can be understood as the surface in the simulated rod that receives the simulated detection current.

[0063] According to the resistivity measuring apparatus provided in embodiments of this disclosure, two intermediate electrodes (e.g., designated as 2 and 3) can measure the potential difference generated by a detection current applied between two working electrodes (designated as 1 and 4). Therefore, the governing equations can simulate the current and potential distribution within the domain. In this invention, the current density vector J (A / m²) of the enclosed surface within the domain... 2 The current density vector J is directly related to the electric field vector E (V / m) within the domain. The ratio between the current density vector J and the electric field vector E is defined by the material conductivity σ (S / m) according to Ohm's law. σ is the reciprocal of the resistivity, and the electric field vector E is the gradient of the target potential difference V. Therefore, the above governing equations and boundary conditions can be solved based on the following formulas (5) to (8).

[0064] (5)

[0065] (6)

[0066] (7)

[0067] Since charge does not accumulate when a material conducts electricity, the simulated rod satisfies the law of current conservation when simulating the reception of a detected current. Therefore, the current flux entering the closed surface of the conductive material is equal to the current flux leaving the surface, hence:

[0068] (8)

[0069] According to the embodiments of this disclosure, when the simulated member is a first member without reinforcing bars, the above-mentioned governing equation formula (3) and boundary condition formula (4) can be solved based on the above formulas (5) to (8) to obtain the first simulated target potential difference U. 23 The first simulated resistivity value ρ is determined based on formulas (1) and (2). t Divide the preset reference resistivity by the simulated value ρ of the first simulated resistivity. t The simulation dimension correction factor corresponding to the first simulated member can be determined. The simulation dimension correction factor can be determined by its proportional relationship with the simulation dimension of the first simulated member.

[0070] According to embodiments of this disclosure, the simulated dimensional proportions can be expressed as the ratio between the length (L), width (W), and height (H) of the first simulated member. For example, the simulated dimensional proportions can be expressed as L:W:H. Similarly, the dimensional proportions of the concrete member can also be expressed as the ratio between the length (L), width (W), and height (H) of the concrete member. Embodiments of this disclosure will not be described in detail here.

[0071] In one embodiment, the current value of the simulated detection current can be determined as 1mA, and the preset reference resistivity can be determined as 100Ω·m.

[0072] In one example, the simulated dimensional ratio can be expressed as L / s:W / s:H / s, where s represents the sample electrode spacing. A dimensional correction factor lookup table can be created by determining the dimensional correction factor k1 corresponding to the simulated dimensional ratio (L / s:W / s:H / s) for different first simulated members. This allows for the determination of the dimensional ratio (L / s:W / s:H / s) of concrete members when measuring them, enabling the lookup of the dimensional correction factor table to obtain the corrected dimensional factors.

[0073] The size correction factor lookup table can be represented based on Tables 1 to 3 below.

[0074] Table 1. Correction coefficients k1 for L / s: W / s: H / s (4:1:1~7:2:10)

[0075]

[0076] Table 2 L / s: W / s: H / s correction factor k1 (7:3:1~9:7:10)

[0077]

[0078] Table 3 L / s: W / s: H / s correction factor k1 (9:8:1~10:9:10)

[0079]

[0080] The following will explain the principle of the invention based on the mapping relationship between the simulation size correction coefficient and the concrete size relationship with Example 1.

[0081] Example 1

[0082] For sample concrete members without reinforcing steel components, to analyze sample concrete members with different cross-sectional dimensions, the length L of the sample concrete members was fixed at 160 mm. By changing the width W, the simulated resistivity ρ of the sample concrete members under different W values ​​was recorded. sAnd the size correction factor k1 changes. The inventors found that as W changes from 40 mm to 320 mm, the simulated resistivity value ρ s Gradually decrease towards the baseline value of 130 As the width W increases, the correction factor k1 approaches 1.0 from 0.26, with its growth rate decreasing and eventually stabilizing at 0.91. Since the length L remains constant at 160 mm, further increasing the cross-sectional size has little effect on resistivity measurement. However, when W > 200 mm, k1 reaches over 0.90. This results in an error of <10% between the simulated resistivity value and the reference resistivity. Because the potential distribution on the sample surface varies with the size of the sample rod, the measurement error of concrete resistivity for sample rods with different cross-sectional sizes in Example 1 ranges from 4.6% to 263.8%.

[0083] When different electrode spacings were set for sample concrete rods without reinforcing steel components, and the size of the concrete rods being tested was fixed, it was found that the simulated resistivity ρ changed as the electrode spacing s varied from 10 mm to 100 mm. s From 133 Dropped to 132 Later increased to 259 The minimum value is in s It appears at 20mm, then gradually increases, and the rate of increase also continues to increase, eventually deviating from the reference value by 98%. This is because in Wenner technology, resistivity is defined as... and The product of the two factors, the ratio of the target potential difference to the detection current, gradually decreases as the electrode spacing *s* increases, where *s* increases tenfold from 10 mm to 100 mm. From 2126 Change to 411 When the distance is reduced to 1 / 5 of its original size, the increase in the spacing s is greater than the decrease in the distance s, resulting in a greater product ρ. s The current increases with the increase of the electrode spacing. When the electrode spacing is small, the current is concentrated inside the cross-sectional area, but when the spacing is wide, the current inside the concrete cross-section gradually diffuses to the edge of the concrete. As s continues to increase, the size effect becomes more significant, resulting in a larger deviation from the reference value. In this embodiment 1, the measurement error of concrete resistivity with different electrode spacings is between 7.8% and 49.6%.

[0084] Example 1 above demonstrates that when using the Wenner technique to measure resistivity, both concrete size and electrode spacing have a significant impact on the measurement results, revealing the mechanism by which the size effect affects the accuracy of resistivity measurements using the Wenner technique. This mechanism can be expressed as follows: the larger the cross-sectional size, the smaller the potential gradient of the target potential difference between the voltage measuring electrodes, leading to a decrease in the measured resistivity value; the larger the electrode spacing, the smaller the potential gradient between the measuring electrodes, but the decrease is significantly less than the increase in electrode spacing, resulting in a gradual increase in the measured resistivity value. Furthermore, the current inside the concrete cross-section gradually diffuses towards the concrete edge, and the cross-sectional boundary gradually affects the current distribution inside the cross-section, exacerbating the size effect. Therefore, the size effect correction coefficient k1 under the combined influence of different concrete sizes and electrode spacings is particularly important. In this Example 1, the proportional relationship between the concrete dimensions (L, W, H) in various directions and the electrode spacing s is normalized, and a new size effect is considered using dimensionless parameters (L / s, W / s, H / s). Following an orthogonal design with L / s:W / s:H / s ratios ranging from 4:1:1 to 10:10:10, a total of 700 sets of dimensions L, W, and H were identified for each spacing. The electrode spacings s discussed were 10mm, 30mm, 50mm, and 70mm. Experimental investigation revealed that, under the same size ratio, the size correction coefficient k1 showed good consistency across different spacings s, indicating that the correction coefficient k1 is independent of the specific value of the electrode spacing and depends only on the proportional relationship between the concrete size and the spacing. Finally, based on the simulation results of the governing equations and boundary conditions of the finite element model, the relationship between the simulated size ratio and the simulated size correction coefficient can be determined as shown in Tables 1 to 4. Therefore, the corresponding size correction coefficient can be determined through the size ratio of the concrete members.

[0085] According to embodiments of this disclosure, the concrete member is a reinforced concrete member with reinforcing bars, and the simulated member includes a second simulated member with simulated reinforcing bars.

[0086] According to embodiments of this disclosure, the extension direction of the reinforcing bar can correspond to the direction of the length L of the reinforced concrete member. Accordingly, the extension direction of the simulated reinforcing bar in the second simulated member can correspond to the direction of the length L of the second simulated member.

[0087] According to embodiments of this disclosure, the processor module can also be configured to determine the resistivity of the concrete member based on a size correction factor, a reinforcement correction factor, and a resistivity simulation value.

[0088] According to embodiments of this disclosure, determining the resistivity of a concrete member based on a size correction factor and a simulated resistivity value associated with the structural dimensions of the concrete member may include: determining the resistivity of the concrete member based on a size correction factor, a reinforcement correction factor, and a simulated resistivity value.

[0089] According to embodiments of this disclosure, the rebar correction factor is determined from a plurality of simulated rebar correction factors based on a target thickness, the target thickness representing the distance of the rebar to the first surface.

[0090] According to embodiments of this disclosure, the simulated rebar correction factor can be associated with the simulated target thickness and stored in a rebar correction factor lookup table. The rebar correction factor k2 associated with the structural dimensions of the concrete member is retrieved using the target thickness.

[0091] In one example, the reinforcement correction factor k2 associated with the structural dimensions of the concrete member can be queried based on the target thickness and electrode spacing.

[0092] According to embodiments of this disclosure, the resistivity ρ of a reinforced concrete member containing reinforcing bars t It can be determined based on the following formula (9).

[0093] (9).

[0094] According to embodiments of this disclosure, the simulated reinforcement correction factor is determined based on the following operations:

[0095] For the second simulated rod, the simulation target ratio between the simulated target thickness of the simulated rebar to the simulated surface of the simulated rod and the preset simulated electrode spacing is determined; the second simulated target potential difference of the second simulated rod under the condition of receiving simulated current is determined; the second simulated target potential difference is processed based on the resistivity simulation function to obtain the simulated value of the second simulated resistivity; and the simulation rebar correction coefficient corresponding to the simulation target ratio is determined based on the ratio between the preset reference resistivity and the simulated value of the second simulated resistivity.

[0096] According to embodiments of this disclosure, the second simulated rod may be a simulated concrete rod containing simulated reinforcing bars, and the simulated electrode spacing corresponds to the electrode spacing. The simulation target ratio can be expressed as... Where c represents the simulated target thickness. The simulated value of the second simulated target potential difference and the simulated resistivity of the second simulated target potential difference can be determined based on formula (1). The ratio between the preset reference resistivity and the simulated value of the second simulated resistivity can be used to obtain the simulated rebar correction coefficient corresponding to the simulated target ratio.

[0097] According to embodiments of this disclosure, the reinforcement correction factor is determined based on the following operations:

[0098] For the second simulated rod, the simulated target thickness of the simulated rebar to the simulated surface of the simulated rod is determined to be the simulated target ratio between the simulated target thickness and the preset simulated electrode spacing. The simulated surface corresponds to the first surface, the simulated electrode spacing corresponds to the electrode spacing, and the simulated electrode spacing is the same as the electrode spacing. The second simulated target potential difference of the second simulated rod under the condition of receiving simulated current is determined. The second simulated target potential difference is processed based on the resistivity simulation function to obtain the simulated value of the second simulated resistivity. Based on the ratio between the preset reference resistivity and the simulated value of the second simulated resistivity, the simulated rebar correction coefficient corresponding to the simulated target ratio is determined. For the same simulated rebar, based on multiple simulated rebar correction coefficients related to the same simulated electrode spacing, the initial coefficients of the variables in the initial equation are fitted to obtain the target equation constructed based on the target coefficients.

[0099] According to embodiments of this disclosure, the objective equation is associated with the simulated rebar diameter of the same simulated rebar, and the objective equation is based on the ratio of the simulated electrode spacing s to the simulated target thickness c as a variable; the target thickness c and electrode spacing s are processed based on the objective equation corresponding to the rebar diameter d of the concrete member to obtain the rebar correction coefficient.

[0100] According to embodiments of this disclosure, determining the second simulated target potential difference of the second simulated rod under the condition of receiving simulated current; and processing the second simulated target potential difference based on the resistivity simulation function to obtain the simulated value of the second simulated resistivity may include determining the ratio with the simulated target based on formula (1). The corresponding second simulated resistivity simulated value ρ s The preset reference resistivity is compared with the simulated value ρ of the second simulated resistivity. s Perform a division operation to obtain the simulation reinforcement correction coefficient k2 for the same second simulation member.

[0101] According to embodiments of this disclosure, for simulated steel bars of the same diameter, multiple simulated steel bar correction coefficients k2 related to the same simulated electrode spacing s can be obtained, and the initial equation can be expressed as formula (10). For example, formula (10) can be understood as a steel bar correction coefficient fitting formula corresponding to any standard diameter simulated steel bar. The steel bar correction coefficient fitting formula is the relationship between the steel bar correction coefficient k2 and the concrete cover thickness c and the electrode spacing s.

[0102] (10).

[0103] Formula (10): k2 is the reinforcement correction coefficient, c is the simulated target thickness, s is the simulated electrode spacing, and A, B, and C are the initial coefficients of the initial equation. The initial coefficients A, B, and C of the variables in the initial equation are fitted to obtain the target equation constructed based on the target coefficients.

[0104] According to embodiments of this disclosure, determining the simulated target potential difference of a simulated rod under the condition of receiving a simulated current includes: obtaining the simulated potential difference based on the simulated current using control equations and boundary conditions, wherein the boundary conditions are used to constrain the current density vector on the surface of the simulated rod to zero, and the control equations are used to control the product of the gradient of the simulated target potential difference and the gradient of the simulated conductivity of the simulated rod to satisfy a preset balance condition with the product of the second gradient of the simulated target potential difference and the simulated conductivity; wherein the simulated target potential difference includes a second simulated target potential difference.

[0105] The following will explain the specific process of determining the rebar simulation coefficient in conjunction with Example 2.

[0106] Example 2

[0107] In a finite element model of concrete containing unidirectional reinforcing bars, the protective layer thickness (target thickness c) ranges from 20mm to 45mm when analyzing different target thicknesses. It can be observed that the resistivity of the sample concrete members gradually increases with the increase of the concrete protective layer thickness. As c changes from 20mm to 45mm, the resistivity gradually increases and approaches the baseline value of 100Ω∙m, while the reinforcement correction factor k2 decreases from 2.58 to 1.31. Because the target thickness c gradually increases, the distance between the reinforcing bars and the electrodes becomes larger, and the thicker protective layer can distribute the current more evenly, making the current flow through the concrete member more uniform and helping to avoid local current concentration. When the target thickness c = 20mm, the current density in this section is mainly distributed inside the reinforcing bars, and the current is mainly conducted through the reinforcing bars. When the target thickness c = 45mm, the current density distribution in this section is wider and more uniform, better reflecting the true resistivity of the concrete, and thus closer to the baseline value.

[0108] When analyzing different rebar diameters (ranging from 8mm to 30mm), the resistivity gradually increases to 63.59 Ω∙m as the rebar diameter d changes from 8mm to 20mm. The correction factor... The resistivity decreases from 2.24 to 1.57; when d is greater than 20 mm, the resistivity value gradually decreases, and the correction factor increases from 1.57 to 1.73.

[0109] The simulation in Example 2 demonstrates that both the diameter of the reinforcing bar and the target thickness *c* of the concrete cover have a significant impact on the resistivity measurement results, revealing the mechanism by which the presence of reinforcing bars affects the accuracy of resistivity measurements using the Wenner technique. This mechanism can be expressed as the reinforcing bar correction coefficient *k2* being particularly important under the combined influence of different concrete cover thicknesses and reinforcing bar diameters. Since the electrode spacing *s* is manually adjustable in actual engineering testing, considering the influence of aggregate particle size and the effect of electrode spacing on the correction coefficient, it is recommended that the electrode spacing of the Wenner technique be fixed at 40 mm in reinforced concrete testing. Verification of the correction coefficient was conducted with a reinforcing bar diameter *d* = 16 mm and a cover thickness *c* = 20 mm to 40 mm. It was found that the simulated resistivity values ​​of reinforced concrete with different cover thicknesses, after two adjustments, all approached the baseline value. The average error without adjustment was 41.48%, while the average error after adjustment was 1.87%.

[0110] In one example, the electrode spacing is fixed at 40mm. For commonly used rebar diameters in practical engineering applications, the rebar diameters are determined to be 8mm, 12mm, 16mm, 20mm, 25mm, and 30mm. Under different protective layer thicknesses (target thickness c), the target equation for the rebar correction coefficient of the concrete member considering the presence of rebar can be based on the following table 5. As shown in Table 1 below, where... c is the target thickness in the concrete member.

[0111] Table 5

[0112]

[0113] According to embodiments of this disclosure, given the simulated rebar correction coefficient k2, target thickness c, and rebar diameter, the initial coefficients A, B, and C of the initial equation can be fitted to obtain the specific target coefficient values ​​of A, B, and C in the target equation for each diameter d shown in Table 5. Thus, the rebar correction coefficient k2 of the concrete member can be calculated by obtaining the target thickness and rebar diameter. The resistivity of the concrete member is determined based on formulas (1) and (9).

[0114] According to embodiments of this disclosure, the measured resistivity simulation value can be corrected based on formulas (1) and (9) to achieve non-destructive measurement of the resistivity of concrete rods.

[0115] According to the resistivity measuring device provided in the embodiments of this disclosure, the target thickness c of the concrete protective layer, the diameter d of the steel bar of the concrete rod to be measured and the electrode spacing s need to be measured or known. Then the steel bar correction coefficient k2 and the size correction coefficient k1 can be obtained. Based on formulas (1) and (9), the resistivity simulation value is corrected to obtain a more accurate resistivity measurement result.

[0116] Example 3

[0117] In this embodiment, the concrete rod can be 320mm×200mm×160mm in size, the electrode spacing s of the device is 40mm, the rebar diameter d of the concrete rod is 16mm, and the target thickness c of the protective layer is 30mm. The processor module can calculate a simulated resistivity of 64.59Ω∙m. Since L / s, W / s, H / s = 8:5:4, the size correction coefficient k1 is 0.895, the rebar correction coefficient k2 is 1.70, and the corrected resistivity is 98.20Ω∙m. The deviation from the baseline value is reduced from 35.41% to 1.80%, indicating a good correction effect.

[0118] According to the apparatus provided in the embodiments of this disclosure, resistivity simulation values ​​are processed by reinforcement correction coefficient and size correction coefficient. The resistivity simulation values ​​can be corrected by determining the reinforcement correction coefficient corresponding to the target thickness and electrode spacing. This avoids the problem of reduced accuracy of resistivity simulation values ​​caused by current concentration due to reinforcement during the detection process, which always propagates along the path with lower resistance.

[0119] Figure 2 The illustration schematically depicts an application scenario of a resistivity measuring device for reinforced concrete members according to an embodiment of this disclosure.

[0120] like Figure 2 As shown, the concrete member 220 may not contain reinforcing bars. A first electrode 211, a second electrode 212, a third electrode 213, and a fourth electrode 214 are arranged sequentially on the first surface 221 of the concrete member 220. The first electrode 211 and the fourth electrode 214 are working electrodes, and the second electrode 212 and the third electrode 213 are intermediate electrodes. By obtaining the length L, width W, and height H of the concrete member 220, the size correction factor k1 can be determined. When measuring the concrete member 220 using the resistance measuring device provided in this embodiment, the resistivity ρ of the concrete member 220 can be determined based on formulas (1) and (2). t .

[0121] Figure 3 The diagram schematically illustrates an application scenario of a resistivity measuring device for reinforced concrete members according to another embodiment of this disclosure.

[0122] like Figure 3As shown, the concrete rod 320 may include reinforcing bars 322. A fifth electrode 311, a sixth electrode 312, a seventh electrode 313, and an eighth electrode 314 are arranged sequentially on the first surface 321 of the concrete rod 320. The fifth electrode 311 and the eighth electrode 314 are working electrodes, and the sixth electrode 312 and the seventh electrode 313 are intermediate electrodes. By obtaining the length L, width W, and height H of the concrete rod 320, a size correction factor k1 can be determined. A reinforcing bar correction factor k2 can be determined based on the diameter and target thickness c of the reinforcing bars 322. When measuring the concrete rod 320 using the resistance measuring device provided in this embodiment, the 220 resistivity ρ of the concrete rod can be determined based on formulas (1) and (9). t .

[0123] According to embodiments of this disclosure, the arrangement direction of the plurality of electrodes is the same as the length direction of the reinforcing bar. For example, the arrangement direction of the plurality of electrodes is the same as the length extension direction of the reinforcing bar.

[0124] According to embodiments of this disclosure, the arrangement direction of the plurality of electrodes is perpendicular to the length direction of the reinforcing bar. For example, the arrangement direction of the plurality of electrodes is perpendicular to the length extension direction of the reinforcing bar.

[0125] In one example, the surface of the concrete member to be measured needs to be smoothed before measurement. The reinforced concrete member contains unidirectional, single-layered reinforcing bars. The axial direction of the reinforcing bars within the member is considered the length direction of the member, the arrangement direction of the unidirectional, single-layered reinforcing bars is considered the width direction of the member, and the direction perpendicular to the reinforced concrete surface where multiple electrodes are arranged is considered the height direction of the member. The reinforced concrete member being measured is a beam-column member, and its width does not meet the electrode installation requirements.

[0126] Another embodiment of this disclosure provides a resistivity measurement method for reinforced concrete members, applied to a resistivity measurement device for reinforced concrete members provided according to embodiments of this disclosure. The resistivity measurement method for reinforced concrete members includes: processing the target potential difference and the current value of the detection current based on a resistivity simulation function to obtain a resistivity simulation value; determining the resistivity of the concrete member based on a size correction coefficient associated with the structural dimensions of the concrete member and the resistivity simulation value, wherein the size correction coefficient is determined based on the sample resistivity corresponding to simulated members with different simulated structural dimensions.

[0127] According to embodiments of this disclosure, the size correction factor is determined from multiple simulated size correction factors based on the structural dimensions. The simulated size correction factor is determined based on the following operations: for the simulated rods in the simulated rods, determining the simulated size ratio between multiple different first simulated structural dimensions; determining the first simulated target potential difference of the first simulated rod under the condition of receiving simulated current; processing the first simulated target potential difference based on the resistivity simulation function to obtain the first simulated resistivity simulation value; and determining the simulated size correction factor corresponding to the simulated size ratio based on the ratio between a preset reference resistivity and the first simulated resistivity simulation value.

[0128] According to embodiments of this disclosure, the concrete member is a reinforced concrete member with reinforcing bars, and the simulated member includes a second simulated member with simulated reinforcing bars.

[0129] According to embodiments of this disclosure, determining the resistivity of a concrete member based on a size correction factor and a simulated resistivity value associated with the structural dimensions of the concrete member includes: determining the resistivity of the concrete member based on a size correction factor, a reinforcement correction factor, and a simulated resistivity value, wherein the reinforcement correction factor is determined from a plurality of simulated reinforcement correction factors based on a target thickness, the target thickness representing the distance of the reinforcement to the first surface.

[0130] According to embodiments of this disclosure, the simulated reinforcement correction factor is determined based on the following operations:

[0131] For the second simulated rod, the simulated target thickness between the simulated rebar and the simulated surface of the simulated rod is determined to be the simulated target ratio between the simulated target thickness and the preset simulated electrode spacing, wherein the simulated surface corresponds to the first surface and the simulated electrode spacing corresponds to the electrode spacing; the second simulated target potential difference of the second simulated rod under the condition of receiving simulated current is determined; the second simulated target potential difference is processed based on the resistivity simulation function to obtain the simulated value of the second simulated resistivity; and the simulated rebar correction coefficient corresponding to the simulated target ratio is determined based on the ratio between the preset reference resistivity and the simulated value of the second simulated resistivity.

[0132] According to embodiments of this disclosure, the concrete member is a reinforced concrete member with reinforcing bars, and the simulated member includes a second simulated member with simulated reinforcing bars.

[0133] According to embodiments of this disclosure, determining the resistivity of a concrete member based on a size correction factor associated with its structural dimensions and a simulated resistivity value includes:

[0134] The resistivity of the concrete member is determined based on the size correction factor, the reinforcement correction factor, and the simulated resistivity value. The reinforcement correction factor is determined based on the following operations: For the second simulated member, the simulated target thickness between the simulated reinforcement and the simulated surface of the simulated member is determined to be the simulated target ratio to the preset simulated electrode spacing, where the simulated surface corresponds to the first surface, the simulated electrode spacing corresponds to the electrode spacing, and the simulated electrode spacing is the same as the electrode spacing; the second simulated target potential difference of the second simulated member under the condition of receiving simulated current is determined; the second simulated target potential difference is processed based on the resistivity simulation function to obtain the simulated second simulated resistivity. The following steps are taken: First, determine the simulation reinforcement correction coefficient corresponding to the simulation target ratio based on the ratio between the preset reference resistivity and the simulated value of the second simulated resistivity. Second, for the same simulated reinforcement, fit the initial coefficients of the variables in the initial equation based on multiple simulation reinforcement correction coefficients related to the same simulation electrode spacing to obtain the target equation constructed based on the target coefficients. The target equation is related to the simulation reinforcement diameter of the same simulated reinforcement, and the target equation uses the ratio of the simulation electrode spacing to the simulation target thickness as a variable. Third, process the target thickness and electrode spacing based on the target equation corresponding to the reinforcement diameter of the concrete member to obtain the reinforcement correction coefficient.

[0135] According to embodiments of this disclosure, determining the simulated target potential difference of a simulated rod under the condition of receiving a simulated current includes: solving for the simulated potential difference based on the simulated current using control equations and boundary conditions, wherein the boundary conditions are used to constrain the current density vector on the surface of the simulated rod to zero, and the control equations are used to control the product of the gradient of the simulated target potential difference and the gradient of the simulated conductivity of the simulated rod to satisfy a preset balance condition with the product of the second gradient of the simulated target potential difference and the simulated conductivity; wherein the simulated rod includes a first simulated rod or a second simulated rod, and the simulated target potential difference includes a first simulated target potential difference or a second simulated target potential difference.

[0136] According to embodiments of this disclosure, the arrangement direction of the plurality of electrodes is the same as the length direction of the reinforcing bar; or the arrangement direction of the plurality of electrodes is perpendicular to the length direction of the reinforcing bar.

[0137] According to embodiments of this disclosure, processing the target potential difference and the current value of the detection current based on the resistivity simulation function to obtain the resistivity simulation value includes: determining an initial resistivity simulation value based on the ratio between the target potential difference and the current value of the detection current; and determining the resistivity simulation value based on the initial resistivity simulation value and the electrode spacing between two different electrodes.

[0138] It should be noted that the apparatus and method provided in this disclosure are based on the inventors' discovery that conventional resistivity measurement techniques are based on assumptions such as semi-infinite materials, isotropy, and homogeneous media. However, due to the significant difference in resistivity between concrete and reinforcing steel, concrete containing reinforcing steel no longer satisfies the assumptions of isotropy and homogeneous media. Current always flows through the path of least resistance, resulting in uneven current field distribution and even current concentration. The presence of reinforcing steel inside the concrete can cause deviations in resistivity measurement results. By determining the target thickness of the reinforcing steel cover and the electrode spacing to determine the steel reinforcement correction coefficient, accurate measurement of concrete members containing reinforcing steel can be achieved. The corrected true resistivity is calculated based on the size correction coefficient, the steel reinforcement correction coefficient, and the simulated resistivity value of the concrete member, allowing for real-time monitoring of the durability performance of reinforced concrete.

[0139] Figure 4 A block diagram of an electronic device suitable for implementing a resistivity measurement method for reinforced concrete members, according to an embodiment of the present disclosure, is shown schematically. Figure 4 The electronic device shown is merely an example and should not be construed as limiting the functionality and scope of the embodiments disclosed herein.

[0140] like Figure 4 As shown, an electronic device 400 according to an embodiment of the present disclosure includes a processor 401, which can perform various appropriate actions and processes according to a program stored in a read-only memory (ROM) 402 or a program loaded from a storage portion 408 into a random access memory (RAM) 403. The processor 401 may include, for example, a general-purpose microprocessor (e.g., a CPU), an instruction set processor and / or an associated chipset and / or a special-purpose microprocessor (e.g., an application-specific integrated circuit (ASIC)), etc. The processor 401 may also include onboard memory for caching purposes. The processor 401 may include a single processing unit or multiple processing units for performing different actions of the method flow according to an embodiment of the present disclosure.

[0141] RAM 403 stores various programs and data required for the operation of electronic device 400. Processor 401, ROM 402, and RAM 403 are interconnected via bus 404. Processor 401 performs various operations of the method flow according to embodiments of the present disclosure by executing programs in ROM 402 and / or RAM 403. It should be noted that the programs may also be stored in one or more memories other than ROM 402 and RAM 403. Processor 401 may also perform various operations of the method flow according to embodiments of the present disclosure by executing programs stored in said one or more memories.

[0142] According to embodiments of this disclosure, the electronic device 400 may further include an input / output (I / O) interface 405, which is also connected to a bus 404. The electronic device 400 may also include one or more of the following components connected to the input / output (I / O) interface 405: an input section 406 including a keyboard, mouse, etc.; an output section 407 including a cathode ray tube (CRT), liquid crystal display (LCD), etc., and a speaker, etc.; a storage section 408 including a hard disk, etc.; and a communication section 409 including a network interface card such as a LAN card, modem, etc. The communication section 409 performs communication processing via a network such as the Internet. A drive 410 is also connected to the input / output (I / O) interface 405 as needed. A removable medium 411, such as a disk, optical disk, magneto-optical disk, semiconductor memory, etc., is installed on the drive 410 as needed so that computer programs read from it can be installed into the storage section 408 as needed.

[0143] According to embodiments of this disclosure, the method flow according to embodiments of this disclosure can be implemented as a computer software program. For example, embodiments of this disclosure include a computer program product comprising a computer program carried on a computer-readable storage medium, the computer program containing program code for performing the methods shown in the flowchart. In such embodiments, the computer program can be downloaded and installed from a network via communication section 409, and / or installed from removable medium 411. When the computer program is executed by processor 401, it performs the functions defined in the system of embodiments of this disclosure. According to embodiments of this disclosure, the systems, devices, apparatuses, modules, units, etc., described above can be implemented by computer program modules.

[0144] This disclosure also provides a computer-readable storage medium, which may be included in the device / apparatus / system described in the above embodiments; or it may exist independently and not assembled into the device / apparatus / system. The computer-readable storage medium carries one or more programs that, when executed, implement the method according to the embodiments of this disclosure.

[0145] According to embodiments of this disclosure, the computer-readable storage medium can be a non-volatile computer-readable storage medium. Examples include, but are not limited to: portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof. In this disclosure, the computer-readable storage medium can be any tangible medium that contains or stores a program that can be used by or in conjunction with an instruction execution system, apparatus, or device.

[0146] For example, according to embodiments of this disclosure, a computer-readable storage medium may include the ROM 402 and / or RAM 403 described above and / or one or more memories other than ROM 402 and RAM 403.

[0147] Embodiments of this disclosure also include a computer program product comprising a computer program containing program code for performing the methods provided in the embodiments of this disclosure. When the computer program product is run on an electronic device, the program code enables the electronic device to implement the resistivity measurement method for reinforced concrete members provided in the embodiments of this disclosure.

[0148] When the computer program is executed by the processor 401, it performs the functions defined in the system / apparatus of this disclosure embodiments. According to embodiments of this disclosure, the systems, apparatuses, modules, units, etc., described above can be implemented by computer program modules.

[0149] In one embodiment, the computer program may rely on a tangible storage medium such as an optical storage device or a magnetic storage device. In another embodiment, the computer program may also be transmitted and distributed in the form of signals over a network medium, and downloaded and installed via communication section 409, and / or installed from removable medium 411. The program code contained in the computer program can be transmitted using any suitable network medium, including but not limited to: wireless, wired, etc., or any suitable combination thereof.

[0150] According to embodiments of this disclosure, program code for executing the computer programs provided in embodiments of this disclosure can be written in any combination of one or more programming languages. Specifically, these computational programs can be implemented using high-level procedural and / or object-oriented programming languages, and / or assembly / machine languages. Programming languages ​​include, but are not limited to, languages ​​such as Java, C++, Python, "C", or similar programming languages. The program code can execute entirely on a user's computing device, partially on a user's device, partially on a remote computing device, or entirely on a remote computing device or server. In cases involving remote computing devices, the remote computing device can be connected to the user's computing device via any type of network, including a local area network (LAN) or a wide area network (WAN), or it can be connected to an external computing device (e.g., via the Internet using an Internet service provider).

[0151] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of the present disclosure. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions indicated in the blocks may occur in a different order than those indicated in the drawings. For example, two consecutively indicated blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in a block diagram or flowchart, and combinations of blocks in a block diagram or flowchart, may be implemented using a dedicated hardware-based system that performs the specified function or operation, or using a combination of dedicated hardware and computer instructions. Those skilled in the art will understand that the features described in the various embodiments of the present disclosure can be combined and / or combined in various ways, even if such combinations are not explicitly described in the present disclosure. In particular, the features described in the various embodiments of this disclosure may be combined and / or combined in various ways without departing from the spirit and teachings of this disclosure. All such combinations and / or combinations fall within the scope of this disclosure.

[0152] The embodiments of this disclosure have been described above. However, these embodiments are for illustrative purposes only and are not intended to limit the scope of this disclosure. Although various embodiments have been described above, this does not mean that the measures in the various embodiments cannot be used advantageously in combination. Various substitutions and modifications can be made by those skilled in the art without departing from the scope of this disclosure, and all such substitutions and modifications should fall within the scope of this disclosure.

Claims

1. A resistivity measuring device for reinforced concrete members, comprising: Multiple electrodes, equally spaced, are disposed on the first surface of the concrete member, including: At least two working electrodes are arranged at the beginning and end of the plurality of electrodes, and the working electrodes are electrically connected to a power source. At least two intermediate electrodes are arranged between the at least two working electrodes; A measuring device electrically connected to at least two of the intermediate electrodes, the measuring device being configured to measure a target potential difference between at least two of the intermediate electrodes when the power supply provides a detection current to the at least two working electrodes; The processor module is configured to process the target potential difference and the current value of the detected current based on the resistivity simulation function to obtain the resistivity simulation value; and to determine the resistivity of the concrete rod based on the size correction coefficient associated with the structural size of the concrete rod and the resistivity simulation value, wherein the size correction coefficient is determined based on the sample resistivity corresponding to the simulated rod with different simulated structural sizes. The concrete member is a reinforced concrete member with reinforcing bars, and the simulated member includes a second simulated member with simulated reinforcing bars; The determination of the resistivity of the concrete member based on the size correction factor associated with the structural dimensions of the concrete member and the simulated resistivity value includes: The resistivity of the concrete member is determined based on the size correction factor, the reinforcement correction factor, and the simulated resistivity value, wherein the reinforcement correction factor is determined based on the following operation: For the second simulated rod, the simulated target thickness from the simulated steel bar to the simulated surface of the simulated rod is determined to be the simulated target ratio between the simulated target thickness and the preset simulated electrode spacing, wherein the simulated surface corresponds to the first surface, the simulated electrode spacing corresponds to the electrode spacing, and the simulated electrode spacing is the same as the electrode spacing; Determine the second simulated target potential difference of the second simulated rod under the condition of receiving simulated current; The second simulated target potential difference is processed based on the resistivity simulation function to obtain the second simulated resistivity simulation value; Based on the ratio between the preset reference resistivity and the simulated value of the second simulated resistivity, a simulated rebar correction coefficient corresponding to the simulated target ratio is determined; For the same simulated rebar, based on multiple simulated rebar correction coefficients related to the same simulated electrode spacing, the initial coefficients of the variables in the initial equation are fitted to obtain a target equation constructed based on the target coefficients. The target equation is related to the simulated rebar diameter of the same simulated rebar, and the target equation is based on the ratio of the simulated electrode spacing to the simulated target thickness as a variable. The target thickness and the electrode spacing are processed based on the target equation corresponding to the diameter of the reinforcing bars in the concrete member to obtain the reinforcing bar correction coefficient.

2. The apparatus of claim 1, wherein, The size correction factor is determined from multiple simulated size correction factors based on the structural dimensions, and the simulated size correction factor is determined based on the following operation: For the simulated rods in the simulated rods, determine the simulated size ratio relationship between multiple different first simulated structural dimensions; Determine the first simulated target potential difference of the first simulated rod under the condition of receiving simulated current; The first simulated target potential difference is processed based on the resistivity simulation function to obtain the first simulated resistivity simulation value; as well as Based on the ratio between the preset reference resistivity and the simulated value of the first simulated resistivity, a simulation size correction coefficient corresponding to the simulation size ratio is determined.

3. The apparatus according to claim 2, in, in, The processor module is configured as follows: The resistivity of the concrete member is determined based on the size correction factor, the reinforcement correction factor, and the simulated resistivity value, wherein the reinforcement correction factor is determined from multiple simulated reinforcement correction factors based on the target thickness, and the target thickness characterizes the distance of the reinforcement to the first surface; The simulated reinforcement correction factor is determined based on the following operation: For the second simulated rod, the simulated target thickness from the simulated steel bar to the simulated surface of the simulated rod is determined to be the simulated target ratio between the simulated target thickness and the preset simulated electrode spacing, wherein the simulated surface corresponds to the first surface and the simulated electrode spacing corresponds to the electrode spacing; Determine the second simulated target potential difference of the second simulated rod under the condition of receiving simulated current; The second simulated target potential difference is processed based on the resistivity simulation function to obtain the second simulated resistivity value; and Based on the ratio between the preset reference resistivity and the simulated value of the second simulated resistivity, a simulated rebar correction coefficient corresponding to the simulated target ratio is determined.

4. The apparatus according to claim 2, wherein, Determining the simulated target potential difference of the simulated rod under the condition of receiving simulated current includes: Based on the simulated current, the simulated potential difference is obtained by solving the control equation and boundary conditions. The boundary conditions are used to constrain the current density vector on the surface of the simulated rod to zero. The control equation is used to control the product of the gradient of the simulated target potential difference and the gradient of the simulated conductivity of the simulated rod to satisfy a preset balance condition with the product of the second gradient of the simulated target potential difference and the simulated conductivity. The simulated rod includes a first simulated rod or a second simulated rod, and the simulated target potential difference includes a first simulated target potential difference or a second simulated target potential difference.

5. The apparatus according to claim 1, wherein, The arrangement direction of the plurality of electrodes is the same as the length direction of the reinforcing bar; or The arrangement direction of the plurality of electrodes is perpendicular to the length direction of the steel bar.

6. The apparatus according to claim 1, wherein, The processor module is configured as follows: Based on the ratio between the target potential difference and the detected current value, an initial simulated resistivity value is determined; and The simulated resistivity value is determined based on the initial simulated resistivity value and the electrode spacing between the two different electrodes.

7. A method for measuring the resistivity of reinforced concrete members, applied to the apparatus according to any one of claims 1 to 6, the method comprising: The resistivity simulation value is obtained by processing the target potential difference and the current value of the detection current based on the resistivity simulation function. The resistivity of the concrete member is determined based on a size correction factor associated with the structural dimensions of the concrete member and the simulated resistivity value, wherein the size correction factor is determined based on the sample resistivity corresponding to each simulated member with different simulated structural dimensions.

8. An electronic device, comprising: One or more processors; Memory, used to store one or more programs. Wherein, when the one or more programs are executed by the one or more processors, the one or more processors implement the method of claim 7.

9. A computer-readable storage medium having executable instructions stored thereon, which, when executed by a processor, cause the processor to perform the method of claim 7.

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