CN113125550A - Mold for researching corrosion monitoring precision of veneering type magnetic sensor and testing method - Google Patents
Mold for researching corrosion monitoring precision of veneering type magnetic sensor and testing method Download PDFInfo
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- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 claims description 34
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims 2
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- 230000007547 defect Effects 0.000 abstract description 6
- 239000004567 concrete Substances 0.000 description 24
- 239000011150 reinforced concrete Substances 0.000 description 16
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Abstract
The invention discloses a die for researching the corrosion monitoring precision of a veneering type magnetic sensor and a testing method thereof, which can be used for researching the influence of key parameters such as different protective layer thicknesses, steel bar diameters and the like on the corrosion monitoring precision of the sensor. The section of the die is rectangular, holes with three sizes are reserved on four sides of the die respectively, and the die can be inserted with a hole D1、D2、D3The thickness of the four-side protective layer of the steel bars with three diameters is c1、c2、c3And c4. The depth of the die is slightly larger than the length of the sensor, and the sensor placing groove is arranged on the surface area of the die, so that the steel bars with certain parameter conditions can be conveniently calibrated. The invention overcomes the defects that the size of the existing mold is difficult to adjust, the existing mold can not be used repeatedly, the test period is long, and the like, and provides the mold which is simple and convenient to operate, easy to assemble and disassemble, reliable in method, low in cost, strong in engineering applicability and capable of accurately testing the influence of key parameters such as the thickness of the protective layer and the like on the precision of the veneering type magnetic sensor.
Description
Technical Field
The invention relates to a steel bar corrosion monitoring technology in constructional engineering, in particular to a die for researching corrosion monitoring precision of a veneering type magnetic sensor and a testing method.
Background
The reinforced concrete structure combines the characteristics of reinforced tension resistance and concrete compression resistance, and has become one of the most widely applied structural forms in the world due to the characteristics of economic manufacturing cost, available local materials, low construction difficulty and the like since the reinforced concrete structure is applied to the field of civil engineering in the middle of 19 th century. However, the loss caused by the failure of the durability of the concrete is huge for a long time and far exceeds the expectation of people, and how to improve the durability of the concrete in service period becomes a worldwide problem. The steel bar corrosion is the most serious in the cause of the durability damage of the concrete, and the method has attracted wide attention at home and abroad. Therefore, how to accurately detect and monitor the corrosion degree of the steel bars in the reinforced concrete structure has very important significance for predicting the service life of the existing reinforced concrete structure and reasonably establishing a maintenance scheme of the reinforced concrete structure. And a great deal of research is also made by the predecessors aiming at the research of monitoring the corrosion of the steel bars in the constructional engineering.
At present, the detection method of the corrosion of the steel bar is divided into damage detection and nondestructive detection. Breakage detects and takes out the reinforcing bar through destroying the concrete protection layer and measure, and the result is comparatively accurate, nevertheless can be to the irreversible harm that the concrete structure caused, and is not suitable for to being in the reinforced concrete structure of in active service period well. The magnetic field nondestructive detection method can monitor the damage of the surface or the near surface of the steel bar under the condition of normal service of the concrete, and quantitatively calculate the corrosion rate of the steel bar. The veneering type magnetic sensor breaks through the limitations of the test stability, the accuracy and the use times of the traditional test method, and realizes the test of the corrosion rate of the non-corner steel bars of the reinforced concrete test piece; the test method is suitable for both newly cast reinforced concrete structures and existing reinforced concrete structures; the measured corrosion rate of the steel bars can be applied to the evaluation of the current service performance and the prediction of the durability of the reinforced concrete structure; the test object is adaptable to different sizes and shapes of concrete columns, beams and slabs. The method has the advantages of clear principle, simple and convenient method, high measuring speed, repeated use, good stability and the like, and can make up for the defects of the prior method and equipment for measuring the corrosion rate of the steel bar. In order to make the surface-mounted magnetic sensor widely applied to practical engineering, the influence of various key influence parameters of the sensor on the testing precision of the sensor needs to be researched.
To obtain the influence of key parameters such as different protective layer thicknesses and steel bar diameters on the corrosion monitoring precision of the veneering type magnetic sensor, the concrete pouring test piece is used for testing, and the following defects are overcome: firstly, the test requires that concrete ingredients used each time are completely the same, the repeatability of the test is low, and the operation difficulty is increased; secondly, a large amount of waiting time is needed for pouring and curing the concrete test piece, so that the test period can be greatly prolonged; thirdly, a large amount of material cost and labor cost are needed for pouring the concrete test piece, and the method is not economical. Therefore, a simple, energy-saving, environmentally-friendly, safe and reliable device is needed to test the influence of these parameters on the accuracy of the sensor.
At present, a common scheme is that a material with the same medium parameters as concrete in a magnetic medium is searched to manufacture a mould to replace the concrete, so that the influence of key parameters such as the thickness of a protective layer and the like on the precision of a veneering type magnetic sensor can be accurately tested in a short time.
The Chinese patent No. CN112034034A entitled "sensor for monitoring non-uniform corrosion of steel bar on a facing surface based on magnetic field principle and testing method" is granted on a day of 04 12 months in 2020, and is based on magnetic field principle, and qualitatively, quantitatively and analytically calculates the corrosion rate of steel bar by testing the change of magnetic induction intensity before and after corrosion of steel bar. But the method is an innovative monitoring means, and the precision of the magnetic sensor can greatly influence the test.
The patent discloses a test mould for corrosion of reinforced concrete, which is entitled as a test mould for corrosion of reinforced concrete by a Chinese patent No. CN208076066U, wherein the publication date is 11.09.2018.A steel bar to be tested is longitudinally cut, a micro strain gauge with a lead is adhered to a cut surface, and then two parts of the steel bar are adhered together and placed in a mould groove to monitor the corrosion condition of the steel bar.
The Chinese patent No. CN108426825A, entitled "manufacturing method and testing method for concrete ERT imaging piezoelectric ceramic sensor", is published as 2018, 08 and 21 days, and is a piezoelectric ceramic die, wherein the piezoelectric ceramic die monitors the corrosion of steel bars by utilizing piezoelectric effect output charges generated by mechanical deformation of piezoelectric ceramic after being stressed, and a common piezoelectric ceramic sensor is used for collecting voltage values, so that the noise is large, the amplitude change is also large, and the ERT imaging precision is poor. The voltage value acquired by the piezoelectric ceramic sensor used in the patent is closer to simulation data, the generated noise error is smaller, and the ERT imaging precision is greatly improved. However, the patent can only compare the accuracy of different sensors, and cannot compare the influence of the change of the key parameter on the accuracy of the sensors.
The above problems are urgently needed to be solved. Therefore, the development of the die capable of testing the influence of key parameters such as the thickness of the protective layer, the diameter of the steel bar and the like on the accuracy of the sensor has very important engineering value, and the accuracy of the veneering type magnetic sensor for monitoring the corrosion of the steel bar can be greatly improved, so that the research quality is improved.
Disclosure of Invention
In order to overcome the defects that the size of the existing mold is difficult to adjust, the existing mold cannot be used repeatedly, the test period is long, and the like, the invention provides the mold for researching the corrosion monitoring precision of the veneering type magnetic sensor and the test method, and the mold is simple and convenient to operate, easy to assemble and disassemble, reliable in method, low in cost, strong in engineering applicability, and capable of accurately testing the influence of key parameters such as the thickness of a protective layer on the precision of the veneering type magnetic sensor.
In order to solve the technical problems, the invention is realized by the following technical scheme:
the utility model provides a research wainscot formula magnetic sensor corrosion monitoring accuracy's mould, the cross-section of mould is the rectangle, has eight holes along direction of height reservation on the mould, and every limit of rectangle corresponds there is three hole, and the aperture size of three hole is different, can insert the reinforcing bar of three kinds of diameters size, and the internal diameter of the three hole that four limits correspond is the same, is equipped with three wainscot formula magnetic sensor standing groove that is used for installing wainscot formula magnetic sensor on four sides of mould respectively, and the mould height is slightly bigger than wainscot formula magnetic sensor length, and three wainscot formula magnetic sensor standing groove on every side corresponds with the three hole on every side respectively.
The eight holes are numbered as H in turn along the clockwise direction1Number H2Number H3Number H4Number H5Number H6Number H7Number H8Number H1Number hole and H5The aperture of the number hole is the same, H2Number hole and H4Number hole, H6Number hole, H8The four holes of the horn hole have the same aperture, H3Number hole and H7The aperture of the number hole is the same.
Furthermore, three protrusions with the height h and the width b are arranged on each side of the side face of the die, and a groove between every two protrusions is used as a veneer type magnetic sensor placing groove.
And further, vacuumizing the interior of the mold, and coating epoxy resin at all gaps to enable the interior of the mold to be in a sealed vacuum state.
Still further, four corners of the die are designed to be round corners.
Furthermore, the veneering type magnetic sensor comprises a magnetic induction intensity monitoring unit and a data processing unit, wherein the magnetic induction intensity monitoring unit comprises a veneering type sensor permanent magnet, a veneering type sensor left magnetic core, a veneering type sensor right magnetic core, a veneering type sensor packaging outer shell, a first Hall sensor and a second Hall sensor, the veneering type sensor packaging outer shell comprises a veneering type sensor inner shell and a veneering type sensor packaging cover, a first Hall sensor placing groove, a second Hall sensor placing groove, a veneering type sensor left magnetic core placing groove, a veneering type sensor right magnetic core placing groove, a veneering type sensor permanent magnet placing groove, a cable bending space and a wire hole are formed in the veneering type sensor inner shell, and the wire hole is communicated with the cable bending space; the veneer type sensor permanent magnet is simultaneously connected with the veneer type sensor left magnetic core and the veneer type sensor right magnetic core and is arranged in a veneer type sensor permanent magnet placing groove, the first Hall sensor and the second Hall sensor are arranged in bilateral symmetry and are respectively arranged in the corresponding Hall sensor placing groove, and the veneer type sensor inner shell and the veneer type sensor packaging cover are respectively provided with a first fixing hole and a second fixing hole; the data processing unit comprises a signal collector, a signal processor and a central controller, wherein the signal input end of the signal collector is electrically connected with the signal output end of the Hall sensor, the output end of the signal collector is electrically connected with the signal input end of the signal processor, and the signal output end of the signal processor is electrically connected with a port of the central controller; and circuit indicating lamps are arranged between the first Hall sensor and the signal collector and between the second Hall sensor and the signal collector.
A test method for researching the corrosion monitoring precision of a veneering type magnetic sensor comprises the following steps:
firstly, preparing a steel bar test piece before testing, wherein the process is as follows:
1.1 get the smooth round steel bars with set length and three different diameters as the calibration steel bars and the steel bars to be measured, the steel bars are divided into three groups of 3 steel bars, wherein D1、D2、D3Each group of HPB300 plain steel bars with the diameter comprises 1 bar and 9 bars; the I group is used for weighing the calibration reinforcing steel bars and recording the mass m of the reinforcing steel bars to be measuredⅠ1、mⅠ2、mⅠ3(ii) a The second group weighs and records the mass m of the steel bar to be measuredⅡ1、mⅡ2、mⅡ3(ii) a III group weighs and records the mass m of the steel bar to be measuredⅢ1、mⅢ2、mⅢ3；
1.2 coating the calibration steel bar and the two ends of the steel bar to be detected with epoxy resin at the positions of 5cm, and taking the part which is not coated with the epoxy resin as a steel bar corrosion region to be detected;
second, preparation before measurement, as follows:
2.1 assemble veneer formula magnetic sensor, install first hall sensor, second hall sensor respectively at first hall sensor standing groove, the second hall sensor standing groove of encapsulation shell, install the permanent magnet in the permanent magnet inslot, then cover the closing cap and encapsulate. Coating epoxy resin at all gaps for sealing;
2.2, controlling the acquisition frequency of the signal acquisition device through the central controller, and testing a magnetic field to ensure that the gauss values of the magnetic induction intensities of the first Hall sensor and the second Hall sensor are the same;
thirdly, a calibration test is carried out, and the process is as follows:
3.1 insert the hole of corresponding diameter respectively in proper order with three groups reinforcing bar that do not corrode:
first diameter D1The steel bar insertion number is H1The magnetic sensor is fixed to the L1The side sensor placing groove has the recording quality of mⅠ1、mⅡ1、mⅢ1The thickness of the corresponding steel bar protective layer is calibrated to be c before the steel bar test piece is corroded1Magnetic induction data BⅠ1，c1、BⅡ1，c1、BⅢ1，c1(ii) a Fixing the magnetic sensor to L4The side sensor placing groove has the recording quality of mⅠ1、mⅡ1、mⅢ1The thickness of the corresponding steel bar protective layer is calibrated to be c before the steel bar test piece is corroded4Magnetic induction data BⅠ1，c4、BⅡ1，c4、BⅢ1，c4(ii) a Then the diameter D is adjusted1The steel bar insertion number is H5The magnetic sensor is fixed to the L2The side sensor placing groove has the recording quality of mⅠ1、mⅡ1、mⅢ1The thickness of the corresponding steel bar protective layer is calibrated to be c before the steel bar test piece is corroded2Magnetic induction data BⅠ1，c2、BⅡ1，c2、BⅢ1，c2(ii) a Fixing the magnetic sensor to L3The side sensor placing groove has the recording quality of mⅠ1、mⅡ1、mⅢ1The thickness of the corresponding steel bar protective layer is calibrated to be c before the steel bar test piece is corroded3Magnetic induction data BⅠ1，c3、BⅡ1，c3、BⅢ1，c3；
The rest D2、D3The operation is repeated as above to the reinforcing bar of diameter, puts into the hole of corresponding size with the reinforcing bar and uses the sensor measurement and record reinforcing bar to decorate preceding magnetic induction. With BGroup number steel bar diameter number, protective layer numberAs shown in the following table:
TABLE 1 magnetic induction before corrosion of reinforcing bars
3.2 realize the simulation experiment of reinforcing bar corrosion with the mode of corrosion is accelerated to the electric current, and control current density is the same, and the reinforcing bar test piece of I group is equidistant time circular telegram tⅠ0, as a calibration steel bar; the reinforcing steel bar test piece of the second group is electrified at equal intervals tⅡ(ii) a The steel bar test pieces of the III group are electrified at equal intervals tⅢ；
3.3 insert three groups of steel bar test pieces after the corrosion in the hole according to the normal position in proper order respectively, measure the magnetic induction intensity of steel bar after the corrosion with veneer-type magnetic sensor again, as shown in the following table:
TABLE 2 magnetic induction after corrosion of reinforcing bars
3.4 taking out the steel bar which is corroded, cutting off the part coated with the epoxy resin at two ends, removing rust on the surface of the steel bar by using a rust remover, weighing, and recording the mass data of the steel bar as m'Ⅰ1、m’Ⅰ2、m’Ⅰ3、m’Ⅱ1、m’Ⅱ2、m’Ⅱ3、m’Ⅲ1、m’Ⅲ2、m’Ⅲ3；
3.5 respectively calculating and calibrating the change rate Delta m of the steel bar qualityⅠ1，△mⅠ2，△mⅠ3，△mⅡ1，△mⅡ2，△mⅡ3，△mⅢ1、△mⅢ2、△mⅢ3The calculation formulas are respectively formulas (1) to (9);
and 3.5, respectively calculating the magnetic induction intensity change rates of the calibrated steel bar and the steel bar to be detected, as shown in the following table.
TABLE 3 magnetic induction intensity Change ratio of reinforcing bars
The calculation formulas are respectively formulas (10) to (14);
3.6 carrying out linear fitting on the relationship between the change rate of the steel bar mass and the change rate of the Hall sensor magnetic induction intensity to obtain a linear relationship coefficient alpha1；
3.7 under the condition of the same diameter of the steel bar, the thicknesses of the protective layers and the magnetic induction intensity of the Hall sensor are differentLinear fitting is carried out on the relationship between the change rates to obtain a linear relationship coefficient beta1、β2、β3、β4；
3.8 under the condition of the same protective layer thickness, the relationship between the diameters of different steel bars and the magnetic induction intensity change rate of the Hall sensor is subjected to linear fitting to obtain a linear relationship coefficient gamma1、γ2、γ3；
Step four, researching and analyzing data, and the process is as follows:
4.1 analyzing and judging the influence of the key parameters on the precision of the veneering type magnetic sensor according to the fitting curve;
4.2 improving and optimizing the sensor according to the analysis result.
Compared with the prior art, the invention has the following advantages and beneficial effects: the method can overcome the defects of complicated operation and high cost of pouring the concrete sample, and realize the rapid measurement of the corrosion rate of the steel bar; the thickness and the aperture size of the protective layer of the mould can be adjusted according to the size required by the test, the corrosion rate of the reinforcing steel bars with different diameters under different thicknesses of the protective layer of the concrete can be measured, the method has the advantages of clear principle, simplicity and convenience, accurate positioning, repeated use, good stability and the like, and the defects of the existing method and the existing mould can be overcome.
Drawings
FIG. 1 is a schematic view of the structure of the apparatus of the present invention.
FIG. 2 is a schematic diagram of the front view and dimensions of the device of the present invention.
Fig. 3 is a schematic structural diagram of a surface-mounted magnetic sensor used in conjunction with the present invention.
Fig. 4 is a schematic structural diagram of a package housing of a surface-mounted magnetic sensor before a cover is closed.
Fig. 5 is a plan view of a cover of the surface-mount magnetic sensor.
FIG. 6 is a schematic diagram of the operation of the apparatus of the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
Referring to fig. 1 to 6, a die for researching corrosion monitoring precision of a veneered magnetic sensor can be used for researching influences of key parameters such as thicknesses of different protective layers, diameters of reinforcing steel bars, lengths of the reinforcing steel bars and the like on the corrosion monitoring precision of the sensor.
The section of the die 1 is a rectangle with the size of a multiplied by b, holes with three sizes are reserved on four sides of the die respectively, and a hole D can be inserted into the hole1、D2、D3HPB300 plain round steel bars of three diameter sizes. The four sides of the clockwise named rectangle are respectively L1Edge 1-1, L2Edge 1-2, L3Edges 1-3 and L4Edges 1-4, the thickness of the four-side protective layer is c1、c2、c3And c4(unit: mm).
Each side of the die is provided with three holes, the three holes are different in aperture size and can be used for inserting steel bars with three diameters, the inner diameters of the three holes corresponding to four sides are the same, and eight holes are numbered as H respectively1Number 2-1, H2Nos. 2-2, H3Nos. 2-3, H4Nos. 2-4, H5Nos. 2-5, H6Nos. 2-6, H7Nos. 2-7, H8Numbers 2-8. In order to facilitate the insertion of the steel bar, the aperture size is 2mm larger than that of the steel bar to be detected. Arranged in a manner of L1The hole reserved from left to right on the edge 1-1 is numbered H1Number 2-1, H2Nos. 2-2, H3Nos. 2 to 3, insert D1、D2、D3Three diameters of steel bars; l is2The hole number reserved from the top to the bottom of the edge 1-2 is H3Nos. 2-3, H4Nos. 2-4, H5Nos. 2 to 5, insert D3、D2、D1Three diameters of steel bars; l is3The holes reserved from right to left on the edges 1-3 are numbered as H5Nos. 2-5, H6Nos. 2-6, H7Nos. 2 to 7, insert D1、D2、D3Three diameters of steel bars; l is4The holes reserved on the edges 1-3 from bottom to top are numbered as H7Nos. 2-7, H8Nos. 2-8, H1Nos. 2-1, insert D3、D2、D1Three diameters of rebar.
The height of the die 1 is slightly larger than the length of the sensor 12, reinforcing steel bars with different lengths can be placed in the die to carry out corrosion monitoring on the reinforcing steel bars with different lengths, three veneering type magnetic sensor placing grooves 3 for mounting veneering type magnetic sensors are respectively arranged on four side surfaces of the die, and the three veneering type magnetic sensor placing grooves on each side surface respectively correspond to three holes on each side; the steel bar calibration under certain parameter conditions is convenient to carry out. The die can simultaneously measure the influence of the thickness of four different protective layers and the diameter of three different steel bars on the measurement precision of the veneering type magnetic sensor.
Organic glass is selected as a material of the die. In the magnetic medium, concrete and organic glass have the same medium parameters, namely the same magnetic permeability parameters. Compared with concrete, the organic glass has the advantages of light weight, simple manufacture, short period, capability of seeing the internal structure and the like, can also complete the test target, and does not influence the test result; is a good test substitute material.
Every limit of this mould side sets up the three of height for h, width for b and swells, and the recess between per two is as veneering type magnetic sensor standing groove, fixes the sensor when making things convenient for the experiment, has increased the stability of sensor.
The interior of the mould is vacuumized, and then epoxy resin is coated at all gaps, so that the interior of the mould is in a sealed vacuum state. Since the relative permeability of concrete and vacuum is 1, and the relative permeability of air is 1.00000037, in order to ensure the measurement accuracy of the test, the test environment should be kept consistent with the actual engineering environment as much as possible.
The four corners of the die are designed into round corners, so that the die is safer in use and more attractive in whole.
The working principle of the invention is as follows: by utilizing the principle that the relative permeability of organic glass, vacuum and concrete is equal, the materials are used for replacing concrete to manufacture a mould, the corrosion rate of reinforcing steel bars with different diameters under the condition of different concrete protective layer thicknesses can be accurately and quickly measured by matching with a veneering type magnetic sensor, and the obtained data can be used for researching the influence of key parameters such as the protective layer thickness and the reinforcing steel bar diameter on the precision of the veneering type magnetic sensor.
As shown in fig. 3, 4 and 5, the surface-mounted magnetic sensor comprises a magnetic induction intensity monitoring unit and a data processing unit, wherein the magnetic induction intensity monitoring unit comprises a surface-mounted sensor permanent magnet 6, a surface-mounted sensor left magnetic core 7-1, a surface-mounted sensor right magnetic core 7-2, a surface-mounted sensor packaging outer shell 12, a first hall sensor 4-1 and a second hall sensor 4-2, the surface-mounted sensor packaging outer shell comprises a surface-mounted sensor inner shell and a surface-mounted sensor packaging cover 12-6, the surface-mounted sensor inner shell is provided with a first hall sensor placing groove 12-1, a second hall sensor placing groove 12-2, a surface-mounted sensor left magnetic core placing groove 12-3, a surface-mounted sensor right magnetic core placing groove 12-4 and a surface-mounted sensor permanent magnet placing groove 12-5, The cable bending device comprises a cable bending space and a cable hole, wherein the cable hole is communicated with the cable bending space; the veneering type sensor permanent magnet 6 is simultaneously connected with a veneering type sensor left magnetic core 7-1 and a veneering type sensor right magnetic core 7-2 and is arranged in a veneering type sensor permanent magnet placing groove 12-5, the first Hall sensor 4-1 and the second Hall sensor 4-2 are arranged in bilateral symmetry and are respectively arranged in the corresponding Hall sensor placing grooves, and both the veneering type sensor inner shell and the veneering type sensor packaging cover 12-6 are provided with a first fixing hole and a second fixing hole; the veneering type sensor packaging shell and the sensor packaging cover comprise first fixing holes and second fixing holes which are threaded holes, and corresponding screws and nuts are used for connecting bolts during installation. The screw and the nut are both made of brass, and the purpose is to prevent interference on a magnetic field. The data processing unit comprises a signal collector 8, a signal processor 9 and a central controller 10, wherein a signal input end of the signal collector 8 is electrically connected with a signal output end of the Hall sensor, an output end of the signal collector 8 is electrically connected with a signal input end of the signal processor 9, a signal output end of the signal processor 9 is electrically connected with a port of the central controller 10, and a circuit indicator light 11 is arranged between the first Hall sensor 4-1 and the signal collector 8, and between the second Hall sensor 4-2 and the signal collector 8.
The veneering type sensor can realize the corrosion monitoring of the steel bar in the existing reinforced concrete structure 13 along the length direction; the veneering type sensor is externally attached to the surface of the reinforced concrete structure, namely the magnetic core is externally arranged outside the reinforced concrete structure, the magnetic circuit passes through the corrosion area of the non-uniform corrosion reinforcing steel bar, the non-uniform corrosion condition of the magnetic circuit passing through the length reinforcing steel bar can be monitored, and the corrosion condition of a single middle part of the reinforced concrete structure for detecting the reinforcing steel bar can be effectively judged through the Hall voltage obtained through testing; the method is used for measuring the corrosion rate of the steel bar, evaluating the corrosion degree of the steel bar and predicting the service life of the steel bar. A permanent magnet replaces a signal generator to generate a magnetic field, and a static magnetic field replaces an electromagnetic field; the permanent magnet of the veneer type sensor, the left magnetic core of the veneer type sensor and the right magnetic core of the veneer type sensor are required to be placed in a magnetic isolation environment after being detected, so that the influence of demagnetization on detection precision is avoided.
The data processing unit of the veneering type magnetic sensor can be realized by using the existing mature technology, and mainly comprises a Hall sensor Hall voltage measuring unit, a Hall sensor Hall voltage measuring unit and a corrosion rate calculating unit. The magnetic induction intensity monitoring unit and the data processing system complete data storage, post-processing and real-time display through the signal processor and the central controller.
Embodiment 1, a test method for a die for studying rust monitoring accuracy of a veneered magnetic sensor, which takes as an example a HPB300 smooth round steel bar with diameters of 20mm, 16mm and 12mm, and a die with a protective layer thickness of 15mm, 20mm, 25mm and 30mm, and includes the following steps:
firstly, preparing a steel bar test piece before testing, wherein the process is as follows:
1.1 get length 20cm and 20mm, 16mm, three kinds of different diameter HPB300 smooth round steel bars of 12mm size as demarcation reinforcing bar and the reinforcing bar that awaits measuring, divide into three group's reinforcing bars, 3 of every group, wherein the HPB300 smooth round steel bar of 20mm, 16mm, 12mm diameter is every group 1, totally 9 reinforcing bars. The I group is used for weighing the calibration reinforcing steel bars and recording the mass m of the reinforcing steel bars to be measuredⅠ1、mⅠ2、mⅠ3(ii) a The second group weighs and records the mass m of the steel bar to be measuredⅡ1、mⅡ2、mⅡ3(ii) a III group weighs and records the mass m of the steel bar to be measuredⅢ1、mⅢ2、mⅢ3；
1.2 coating the calibration steel bar and the steel bar to be detected 5 with the epoxy resin at positions 5cm away from both ends, wherein the part which is not coated with the epoxy resin is used as a steel bar corrosion region to be detected;
second, preparation before measurement, as follows:
2.1 assembling the veneering type magnetic sensor, respectively installing a first Hall sensor 4-1 and a second Hall sensor 4-2 in a first Hall sensor placing groove 12-1 and a second Hall sensor placing groove 12-2 of an encapsulation shell, installing a permanent magnet 6 in a permanent magnet groove 12-5, and then covering a sealing cover 12-6 for encapsulation. Coating epoxy resin at all gaps for sealing;
2.2, the central controller 10 controls the acquisition frequency of the signal acquisition device 8 to test the magnetic field, so that the magnetic induction intensity gauss values of the first Hall sensor 4-1 and the second Hall sensor 4-2 are the same.
Thirdly, a calibration test is carried out, and the process is as follows:
3.1 inserting the three groups of steel bars which are not rusted into the holes with the corresponding diameters in sequence.
Firstly, inserting the steel bar with the diameter of 20mm into the steel bar with the number of H1Hole 2-1 of (a) for fixing the magnetic sensor to the L1An on-edge sensor placement groove 3-1 with recording mass mⅠ1、mⅡ1、mⅢ1Magnetic induction intensity data B of calibration steel bar protective layer with thickness of 15mm before corrosion of corresponding steel bar test pieceⅠ1，c1、BⅡ1，c1、BⅢ1，c1(ii) a Fixing the magnetic sensor to L4The sensor placing groove on the edge is 3-12, and the recording quality is mⅠ1、mⅡ1、mⅢ1Magnetic induction intensity data B of calibration reinforcing steel bar protective layer with thickness of 30mm before corrosion of corresponding reinforcing steel bar test pieceⅠ1，c4、BⅡ1，c4、BⅢ1，c4(ii) a Then inserting the steel bar with the diameter of 20mm into the steel bar with the number of H5The holes 2-5 for fixing the magnetic sensor to the L2The sensor placing groove on the edge is 3-6, and the recording quality is mⅠ1、mⅡ1、mⅢ1Magnetic induction intensity data B of calibration steel bar protective layer with thickness of 20mm before corrosion of corresponding steel bar test pieceⅠ1，c2、BⅡ1，c2、BⅢ1，c2(ii) a Fixing the magnetic sensor to L3The sensor placing groove on the edge is 3-7, and the recording quality is mⅠ1、mⅡ1、mⅢ1Magnetic induction intensity data B of calibration steel bar protective layer with thickness of 25mm before corrosion of corresponding steel bar test pieceⅠ1，c3、BⅡ1，c3、BⅢ1，c3；
And repeating the above operations on the rest steel bars with the diameters of 16mm and 12mm, putting the steel bars into the holes with corresponding sizes, and measuring and recording the magnetic induction intensity before the steel bars are corroded by using the sensor. B isGroup number steel bar diameter number, protective layer numberAs shown in the following table:
TABLE 4 magnetic induction before corrosion of reinforcing bars
3.2 realize the simulation experiment of reinforcing bar corrosion with the mode of corrosion is accelerated to the electric current, and control current density is the same, and the reinforcing bar test piece of I group is equidistant time circular telegram tⅠ0, as a calibration steel bar; electrifying the steel bar test piece in the group II at equal intervals for 6 d; electrifying the steel bar test piece in the group III for 12d at equal intervals;
3.3 insert three groups of steel bar test pieces after the corrosion in the hole according to the normal position in proper order respectively, measure the magnetic induction intensity of steel bar after the corrosion with veneer-type magnetic sensor again, as shown in the following table:
TABLE 5 magnetic induction after corrosion of reinforcing bars
3.4 taking out the steel bar which is corroded, cutting off the part coated with the epoxy resin at two ends, removing rust on the surface of the steel bar by using a rust remover, weighing, and recording the mass data of the steel bar as m'Ⅰ1、m’Ⅰ2、m’Ⅰ3、m’Ⅱ1、m’Ⅱ2、m’Ⅱ3、m’Ⅲ1、m’Ⅲ2、m’Ⅲ3；
3.5 respectively calculating and calibrating the change rate Delta m of the steel bar qualityⅠ1、△mⅠ2、△mⅠ3、△mⅡ1、△mⅡ2、△mⅡ3、△mⅢ1、△mⅢ2、△mⅢ3The calculation formulas are respectively formulas (1) to (9);
3.6 calculating the magnetic induction intensity change rate of the calibration steel bar and the steel bar to be measured respectively, as shown in the following table.
TABLE 6 magnetic induction intensity Change ratio of reinforcing bars
The calculation formulas are respectively formulas (10) to (14);
3.6 carrying out linear fitting on the relationship between the change rate of the steel bar mass and the change rate of the Hall sensor magnetic induction intensity to obtain a linear relationship coefficient alpha1；
3.7 carrying out linear fitting on the relationship between the thicknesses of different protective layers and the magnetic induction intensity change rate of the Hall sensor under the condition of the same diameter of the steel bar to obtain a linear relationship coefficient beta1、β2、β3、β4；
3.8 under the condition of the same protective layer thickness, the relationship between the diameters of different steel bars and the magnetic induction intensity change rate of the Hall sensor is subjected to linear fitting to obtain a linear relationship coefficient gamma1、γ2、γ3；
Step four, researching and analyzing data, and the process is as follows:
4.1 analyzing and judging the influence of the key parameters on the precision of the veneering type magnetic sensor according to the fitting curve;
4.2 improving and optimizing the sensor according to the analysis result;
example 2, a test method for studying the influence of the insertion length of the steel bar on the corrosion monitoring accuracy of the sensor, selects dies with diameters of 20mm, 16mm and 12mm for HPB300 smooth steel bar and thicknesses of protective layers of 15mm, 20mm, 25mm and 30mm respectively, and the thickness of the die is 10 cm.
Firstly, preparing a steel bar test piece before being tested, wherein the process is as follows:
1.1 get length 20cm and 20mm, 16mm, three kinds of different diameter HPB300 smooth round steel bars of 12mm size as demarcation reinforcing bar and the reinforcing bar that awaits measuring, divide into two sets of reinforcing bars, every group 3, wherein the HPB300 smooth round steel bar of 20mm, 16mm, 12mm diameter every group respectively 1, totally 6 reinforcing bars. The I group is used for weighing the calibration reinforcing steel bars and recording the mass m of the reinforcing steel bars to be measuredⅠ1、mⅠ2、mⅠ3(ii) a The second group weighs and records the mass m of the steel bar to be measuredⅡ1、mⅡ2、mⅡ3；
1.2 coating the calibration steel bar and the two ends of the steel bar to be detected with epoxy resin at the positions of 5cm, and taking the part which is not coated with the epoxy resin as a steel bar corrosion region to be detected;
second, preparation before measurement, as follows:
2.1 assembling the veneering type magnetic sensor, respectively installing a first Hall sensor 4-1 and a second Hall sensor 4-2 in a first Hall sensor placing groove 12-1 and a second Hall sensor placing groove 12-2 of an encapsulation shell, installing a permanent magnet 6 in a permanent magnet groove 12-5, and then covering a sealing cover 12-6 for encapsulation. Coating epoxy resin at all gaps for sealing;
2.2, the central controller 10 controls the acquisition frequency of the signal acquisition device 8 to test the magnetic field, so that the magnetic induction intensity gauss values of the first Hall sensor 4-1 and the second Hall sensor 4-2 are the same.
Thirdly, a calibration test is carried out, and the process is as follows:
3.1 inserting the two groups of steel bars which are not rusted into the holes with the corresponding diameters in sequence respectively. First, the magnetic sensor is fixed to L13-1 of the sensor placing groove on the edge, and then respectively inserting the reinforcing steel bars with the diameter of 20mm into the grooves with the serial number of H1The hole 2-1 of (a) has an insertion depth of 1/4, i.e. 2.5cm, of the thickness of the mould, and the recorded mass is mⅠ1、mⅡ1Magnetic induction intensity data B of corresponding steel bar test piece with calibrated steel bar insertion depth of 2.5cm before corrosionⅠ1，1/4、BⅡ1，1/4(ii) a The depth of insertion was adjusted to 1/2, i.e. 5cm, of the thickness of the mould, the recorded mass being mⅠ1、mⅡ1Magnetic induction intensity data B of 5cm of steel bar insertion depth is demarcated before corrosion of corresponding steel bar test pieceⅠ1，1/2、BⅡ1，1/2(ii) a The insertion depth was adjusted to the mold thickness, i.e. 10cm, and the mass recorded was mⅠ1、mⅡ1Magnetic induction intensity data B of corresponding steel bar test piece with 10cm of calibrated steel bar insertion depth before corrosionⅠ1，1、BⅡ1，1；
And repeating the above operations on the rest steel bars with the diameters of 16mm and 12mm, putting the steel bars into the holes with corresponding sizes, and measuring and recording the magnetic induction intensity before the steel bars are corroded by using the sensor. The diameter number of the steel bar is expressed by B group number, and the length of the steel bar inserted into the die is expressed as the following table:
TABLE 7 magnetic induction before corrosion of reinforcing bars
3.2 realize the simulation experiment of reinforcing bar corrosion with the mode of corrosion is accelerated to the electric current, and control current density is the same, and the reinforcing bar test piece of I group is equidistant time circular telegram tⅠ0, as a calibration steel bar; electrifying the steel bar test piece in the group II at equal intervals for 6 d;
3.3 insert the hole again according to normal position, former degree of depth respectively in proper order with two sets of corrosion back reinforcing bar test pieces, measure the magnetic induction intensity of corrosion back reinforcing bar with veneer type magnetic sensor, as shown in the following table:
TABLE 8 magnetic induction after corrosion of reinforcing bars
3.4 taking out the steel bar which is corroded, cutting off the part coated with the epoxy resin at two ends, removing rust on the surface of the steel bar by using a rust remover, weighing, and recording the mass data of the steel bar as m'Ⅰ1、m’Ⅰ2、m’Ⅰ3、m’Ⅱ1、m’Ⅱ2、m’Ⅱ3；
3.5 respectively calculating and calibrating the change rate Delta m of the steel bar qualityⅠ1、△mⅠ2、△mⅠ3、△mⅡ1、△mⅡ2、△mⅡ3The calculation formulas are respectively formulas (19) to (24);
and 3.5, respectively calculating the magnetic induction intensity change rates of the calibrated steel bar and the steel bar to be detected, as shown in the following table.
TABLE 9 magnetic induction intensity Change ratio of reinforcing bars
The calculation formulas are respectively formulas (25) to (30);
3.6 carrying out linear fitting on the relationship between the change rate of the steel bar mass and the change rate of the Hall sensor magnetic induction intensity to obtain a linear relationship coefficient alpha1；
3.7 carrying out linear fitting on the relationship between the insertion lengths of different steel bars and the magnetic induction intensity change rate of the Hall sensor under the condition of the same steel bar diameter to obtain a linear relationship coefficient beta1、β2、β3；
3.8 under the condition of the same steel bar insertion depth, linear fitting is carried out on the relationship between the diameters of different steel bars and the magnetic induction intensity change rate of the Hall sensor to obtain a linear relationship coefficient gamma1、γ2、γ3；
Step four, researching and analyzing data, and the process is as follows:
4.1 analyzing and judging the influence of the key parameters on the precision of the veneering type magnetic sensor according to the fitting curve;
4.2 improving and optimizing the sensor according to the analysis result;
in the specific implementation, the invention does not limit the specific device type, as long as the device can complete the above functions.
Finally, it should be noted that the above list is only for the specific examples of testing laboratory fresh concrete and does not limit the invention.
The embodiments of the invention described herein are merely illustrative of implementations of the inventive concept and the scope of the invention should not be considered limited to the specific forms set forth in the embodiments but rather by the equivalents thereof as may occur to those skilled in the art upon consideration of the present inventive concept.
Claims (7)
1. The utility model provides a research die of veneer formula magnetic sensor corrosion monitoring precision which characterized in that: the cross-section of mould is the rectangle, has eight holes along direction of height reservation on the mould, and every limit of rectangle corresponds has three hole, and the aperture size of three hole is different, can insert the reinforcing bar of three kinds of diameters size, and the internal diameter of the three hole that four limits correspond is the same, is equipped with three veneer formula magnetic sensor standing groove that is used for installing veneer formula magnetic sensor on four sides of mould respectively, and the mould height is slightly bigger than veneer formula magnetic sensor length, and three veneer formula magnetic sensor standing groove on every side corresponds with the three hole on every side respectively.
2. The die for researching the rust monitoring precision of the veneering type magnetic sensor according to claim 1, wherein the die comprises: the eight holes are numbered as H in turn along the clockwise direction1Number H2Number H3Number H4Number H5Number H6Number H7Number H8Number H1Number hole and H5The aperture of the number hole is the same, H2Number hole and H4Number hole, H6Number hole, H8The four holes of the horn hole have the same aperture, H3Number hole and H7The aperture of the number hole is the same.
3. The die for researching the rust monitoring precision of the veneering type magnetic sensor as claimed in claim 1 or 2, wherein: three protrusions with the height of h and the width of b are arranged on each side of the side face of the die, and a groove between every two protrusions is used as a veneer type magnetic sensor placing groove.
4. The die for researching the rust monitoring precision of the veneering type magnetic sensor as claimed in claim 1 or 2, wherein: and vacuumizing the interior of the mold, and coating epoxy resin at all gaps to enable the interior of the mold to be in a sealed vacuum state.
5. The die for researching the rust monitoring precision of the veneering type magnetic sensor as claimed in claim 1 or 2, wherein: four corners of the die are designed to be round corners.
6. The die for researching the rust monitoring precision of the veneering type magnetic sensor as claimed in claim 1 or 2, wherein: the veneering type magnetic sensor comprises a magnetic induction intensity monitoring unit and a data processing unit, wherein the magnetic induction intensity monitoring unit comprises a veneering type sensor permanent magnet, a veneering type sensor left magnetic core, a veneering type sensor right magnetic core, a veneering type sensor packaging shell, a first Hall sensor and a second Hall sensor; the veneer type sensor permanent magnet is simultaneously connected with the veneer type sensor left magnetic core and the veneer type sensor right magnetic core and is arranged in a veneer type sensor permanent magnet placing groove, the first Hall sensor and the second Hall sensor are arranged in bilateral symmetry and are respectively arranged in the corresponding Hall sensor placing groove, and the veneer type sensor inner shell and the veneer type sensor packaging cover are respectively provided with a first fixing hole and a second fixing hole; the data processing unit comprises a signal collector, a signal processor and a central controller, wherein the signal input end of the signal collector is electrically connected with the signal output end of the Hall sensor, the output end of the signal collector is electrically connected with the signal input end of the signal processor, and the signal output end of the signal processor is electrically connected with a port of the central controller; and circuit indicating lamps are arranged between the first Hall sensor and the signal collector and between the second Hall sensor and the signal collector.
7. The test method for researching the corrosion monitoring precision of the veneering type magnetic sensor based on the mold as claimed in claim 1 is characterized by comprising the following steps:
firstly, preparing a steel bar test piece before testing, wherein the process is as follows:
1.1 get the smooth round steel bars with set length and three different diameters as the calibration steel bars and the steel bars to be measured, the steel bars are divided into three groups of 3 steel bars, wherein D1、D2、D3Each group of HPB300 plain steel bars with the diameter comprises 1 bar and 9 bars; the I group is used for weighing the calibration reinforcing steel bars and recording the mass m of the reinforcing steel bars to be measuredⅠ1、mⅠ2、mⅠ3(ii) a The second group weighs and records the mass m of the steel bar to be measuredⅡ1、mⅡ2、mⅡ3(ii) a III group weighs and records the mass m of the steel bar to be measuredⅢ1、mⅢ2、mⅢ3；
1.2 coating the calibration steel bar and the two ends of the steel bar to be detected with epoxy resin at the positions of 5cm, and taking the part which is not coated with the epoxy resin as a steel bar corrosion region to be detected;
second, preparation before measurement, as follows:
2.1 assembling a veneering type magnetic sensor, respectively installing a first Hall sensor and a second Hall sensor in a first Hall sensor placing groove and a second Hall sensor placing groove of an encapsulation shell, installing a permanent magnet in a permanent magnet groove, and then covering a sealing cover for encapsulation; coating epoxy resin at all gaps for sealing;
2.2, controlling the acquisition frequency of the signal acquisition device through the central controller, and testing a magnetic field to ensure that the gauss values of the magnetic induction intensities of the first Hall sensor and the second Hall sensor are the same;
thirdly, a calibration test is carried out, and the process is as follows:
3.1 insert the hole of corresponding diameter respectively in proper order with three groups reinforcing bar that do not corrode:
first diameter D1The steel bar insertion number is H1The magnetic sensor is fixed to the L1The side sensor placing groove has the recording quality of mⅠ1、mⅡ1、mⅢ1The thickness of the corresponding steel bar protective layer is calibrated to be c before the steel bar test piece is corroded1Magnetic induction data BⅠ1，c1、BⅡ1，c1、BⅢ1，c1(ii) a Fixing the magnetic sensor to L4The side sensor placing groove has the recording quality of mⅠ1、mⅡ1、mⅢ1The thickness of the corresponding steel bar protective layer is calibrated to be c before the steel bar test piece is corroded4Magnetic induction data BⅠ1，c4、BⅡ1，c4、BⅢ1，c4(ii) a Then the diameter D is adjusted1The steel bar insertion number is H5The magnetic sensor is fixed to the L2The side sensor placing groove has the recording quality of mⅠ1、mⅡ1、mⅢ1The thickness of the corresponding steel bar protective layer is calibrated to be c before the steel bar test piece is corroded2Magnetic induction data BⅠ1，c2、BⅡ1，c2、BⅢ1，c2(ii) a Fixing the magnetic sensor to L3The side sensor placing groove has the recording quality of mⅠ1、mⅡ1、mⅢ1The thickness of the corresponding steel bar protective layer is calibrated to be c before the steel bar test piece is corroded3Magnetic induction data BⅠ1，c3、BⅡ1，c3、BⅢ1，c3；
The rest D2、D3Repeating the operation above for the steel bars with the diameters, putting the steel bars into the holes with the corresponding sizes, and measuring and recording the magnetic induction intensity before steel bar modification by using the sensor;
3.2 realize the simulation experiment of reinforcing bar corrosion with the mode of corrosion is accelerated to the electric current, and control current density is the same, and the reinforcing bar test piece of I group is equidistant time circular telegram tⅠ0, as a calibration steel bar; the reinforcing steel bar test piece of the second group is electrified at equal intervals tⅡ(ii) a The steel bar test pieces of the III group are electrified at equal intervals tⅢ；
3.3 inserting the three groups of corroded steel bar test pieces into the holes in sequence in situ, measuring the magnetic induction intensity of the corroded steel bars by using a veneering type magnetic sensor again 3.4, taking out the corroded steel bars, cutting off parts coated with epoxy resin at two ends, removing iron rust on the surfaces of the steel bars by using a rust remover, weighing, and recording the quality data of the steel bars as m'Ⅰ1、m’Ⅰ2、m’Ⅰ3、m’Ⅱ1、m’Ⅱ2、m’Ⅱ3、m’Ⅲ1、m’Ⅲ2、m’Ⅲ3；
3.5 respectively calculating and calibrating the change rate Delta m of the steel bar qualityⅠ1，△mⅠ2，△mⅠ3，△mⅡ1，△mⅡ2，△mⅡ3，△mⅢ1、△mⅢ2、△mⅢ3The calculation formulas are respectively formulas (1) to (9);
3.5 calculating the magnetic induction intensity change rate of the calibration steel bar and the steel bar to be detected respectively;
3.6 carrying out linear fitting on the relationship between the change rate of the steel bar mass and the change rate of the Hall sensor magnetic induction intensity to obtain a linear relationship coefficient alpha1；
3.7 carrying out linear fitting on the relationship between the thicknesses of different protective layers and the magnetic induction intensity change rate of the Hall sensor under the condition of the same diameter of the steel bar to obtain a linear relationship coefficient beta1、β2、β3、β4；
3.8 under the condition of the same protective layer thickness, the relationship between the diameters of different steel bars and the magnetic induction intensity change rate of the Hall sensor is subjected to linear fitting to obtain a linear relationship coefficient gamma1、γ2、γ3；
Step four, researching and analyzing data, and the process is as follows:
4.1 analyzing and judging the influence of the key parameters on the precision of the veneering type magnetic sensor according to the fitting curve;
4.2 improving and optimizing the sensor according to the analysis result.
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