CN212904662U - Non-uniform corrosion nondestructive monitoring sensor for newly-poured reinforced concrete structural steel bar - Google Patents
Non-uniform corrosion nondestructive monitoring sensor for newly-poured reinforced concrete structural steel bar Download PDFInfo
- Publication number
- CN212904662U CN212904662U CN202021785887.7U CN202021785887U CN212904662U CN 212904662 U CN212904662 U CN 212904662U CN 202021785887 U CN202021785887 U CN 202021785887U CN 212904662 U CN212904662 U CN 212904662U
- Authority
- CN
- China
- Prior art keywords
- sensor
- external
- magnetic core
- steel bar
- reinforced concrete
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 230000007797 corrosion Effects 0.000 title claims abstract description 76
- 238000005260 corrosion Methods 0.000 title claims abstract description 76
- 239000011150 reinforced concrete Substances 0.000 title claims abstract description 69
- 238000012544 monitoring process Methods 0.000 title claims abstract description 60
- 229910000746 Structural steel Inorganic materials 0.000 title claims abstract description 14
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 78
- 239000010959 steel Substances 0.000 claims abstract description 78
- 238000004806 packaging method and process Methods 0.000 claims abstract description 76
- 238000001514 detection method Methods 0.000 claims description 18
- 238000005452 bending Methods 0.000 claims description 17
- 238000012545 processing Methods 0.000 claims description 12
- 230000006698 induction Effects 0.000 claims description 9
- 238000009434 installation Methods 0.000 claims description 8
- 229910000976 Electrical steel Inorganic materials 0.000 claims description 3
- KODSSUQEZHPTOH-UHFFFAOYSA-N [Ni].[B].[Nd] Chemical compound [Ni].[B].[Nd] KODSSUQEZHPTOH-UHFFFAOYSA-N 0.000 claims description 3
- 238000013500 data storage Methods 0.000 claims description 3
- 239000004033 plastic Substances 0.000 claims description 3
- 229920003023 plastic Polymers 0.000 claims description 3
- 238000012805 post-processing Methods 0.000 claims description 3
- 238000002955 isolation Methods 0.000 claims description 2
- 238000010998 test method Methods 0.000 abstract description 3
- 238000012360 testing method Methods 0.000 description 34
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 30
- 239000004567 concrete Substances 0.000 description 20
- 238000000034 method Methods 0.000 description 15
- 238000005516 engineering process Methods 0.000 description 11
- 230000006872 improvement Effects 0.000 description 10
- 238000004364 calculation method Methods 0.000 description 6
- 238000005538 encapsulation Methods 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 239000004576 sand Substances 0.000 description 6
- 238000005266 casting Methods 0.000 description 5
- 230000008859 change Effects 0.000 description 5
- 238000012423 maintenance Methods 0.000 description 5
- 230000003014 reinforcing effect Effects 0.000 description 5
- 239000004568 cement Substances 0.000 description 4
- 230000007547 defect Effects 0.000 description 4
- 238000000465 moulding Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 239000011398 Portland cement Substances 0.000 description 3
- 230000006378 damage Effects 0.000 description 3
- 239000003550 marker Substances 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 230000002787 reinforcement Effects 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 239000004575 stone Substances 0.000 description 3
- 239000008399 tap water Substances 0.000 description 3
- 235000020679 tap water Nutrition 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 230000005347 demagnetization Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 238000011065 in-situ storage Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000009659 non-destructive testing Methods 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000003487 electrochemical reaction Methods 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Images
Landscapes
- Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
Abstract
A non-uniform corrosion nondestructive monitoring sensor for a newly cast reinforced concrete structural steel bar based on a magnetic field principle comprises an external sensor and a separate sensor, wherein the external sensor comprises an external sensor left magnetic core, an external sensor right magnetic core, an external sensor permanent magnet, a first Hall sensor, a second Hall sensor and an external sensor packaging shell; the separated sensor comprises a separated sensor permanent magnet, an inner magnetic core, an outer magnetic core, a separated sensor embedded part packaging shell and a separated sensor external part packaging shell. And to provide a test method. The invention effectively measures the non-uniform corrosion of the steel bar through the non-uniform corrosion area of the steel bar by the magnetic field, one external magnetic core corresponds to a plurality of internal magnetic cores to carry out corrosion monitoring, and one external sensor corresponds to a plurality of reinforced concrete structures to carry out corrosion monitoring.
Description
Technical Field
The invention relates to a reinforcing steel bar corrosion monitoring technology in constructional engineering, in particular to a non-uniform corrosion nondestructive monitoring sensor for a newly-poured reinforced concrete structural reinforcing steel bar based on a magnetic field principle.
Background
Since 1824 the cement was invented, concrete became the most widely used building material in the world, and because of its abundant raw materials, simple manufacturing process, low cost, and high compressive strength, it has been widely used in civil and industrial buildings, bridges, tunnels and other civil engineering fields. In 1991, the corrosion of steel reinforcement caused by chloride corrosion was indicated to be the most serious and prevalent problem of durability of concrete structures at the second international academic conference on concrete durability.
Corrosion of the steel reinforcement not only reduces the load-bearing capacity of the reinforced concrete structure, but also reduces the effective cross-sectional area of the steel reinforcement and the adhesion between the reinforced concrete. Therefore, the method has important significance for reasonably formulating a maintenance scheme of the reinforced concrete structure and guaranteeing the safety of the concrete structure by quantitatively representing and monitoring the corrosion degree of the steel bars in the reinforced concrete structure.
At present, the monitoring method of the steel bar corrosion is divided into damage detection and nondestructive detection. The damage detection measurement result is more accurate, but need to carry out the broken type to reinforced concrete structure and take out the reinforcing bar, and the harm that causes the concrete structure is irreversible, and is not suitable for being adjusted the reinforced concrete structure in service period well. The nondestructive testing method is a hotspot of current research, and mainly comprises a half-cell potential method, an acoustic emission technology and a built-in monitoring technology. The half-cell potential method utilizes the potential change caused by the electrochemical reaction of the steel bar corrosion to determine the steel bar corrosion state, but the accuracy is lower, the probability of the steel bar corrosion can be only determined qualitatively, and no unified determination standard exists; the acoustic emission technology can only qualitatively judge the corrosion occurrence probability according to parameters such as accumulated impact number and the like, and can not quantitatively measure the corrosion rate of the steel bar; a steel bar corrosion monitoring method based on a magnetic field principle is disclosed in Chinese patent No. CN109374726A, wherein the publication date is 22 days in 2019 and 2 months, the name of the steel bar corrosion nondestructive dynamic monitoring sensor and system in concrete based on a magnetic field is 'Chinese patent No. CN208420791U, the publication date is 22 days in 2019 and 1 month, the name of the steel bar corrosion electromagnetic field variable response device', two patents provide a steel bar corrosion monitoring sensor built in concrete, and the sensor can accurately measure the uniform corrosion condition of steel bars, but the defects exist: the built-in monitoring sensor can limit corrosion expansion of the reinforcing steel bar due to clamping of the reinforcing steel bar, the natural corrosion rule of the reinforcing steel bar is influenced, the sensor can only accurately measure the uniform corrosion condition of the reinforcing steel bar, but the corrosion of the reinforcing steel bar under the natural environment is not uniform. In addition, the sensor is arranged in the concrete and can only be used once, so that the cost is higher; the Chinese patent publication No. CN108469514A, which is published as 2018, 8, 31 and is named as 'equipment and method for monitoring corrosion behavior of steel bars in concrete', the sensor related to the patent is an external sensor, the defects exist, the corrosion can be only determined aiming at small steel bar concrete samples in a laboratory, and the test results are greatly influenced by different steel bar positions. In actual engineering, the reinforced concrete columns, beams and plates often have complex steel bar arrangement, and the corrosion distribution of the angle steel bars and the middle steel bars presents different trends, so the above patents cannot perform corrosion monitoring on the steel bars of the reinforced concrete structure.
In actual construction engineering, a sensor and a test method for accurately measuring the corrosion rate of the steel bars are still unavailable.
Therefore, the steel bar non-uniform corrosion monitoring sensor with the advantages of clear principle, simple and convenient method, high measuring speed, repeated use, strong engineering applicability, good stability and the like is found, and the improvement of the steel bar corrosion degree evaluation and prediction has important significance for continuous deepening.
Disclosure of Invention
In order to overcome the defects of the existing nondestructive monitoring technology for the corrosion of the steel bar in the building engineering, the invention provides a nondestructive monitoring technology which has high stability and simple and convenient operation and can realize the corrosion monitoring of the steel bar, in particular to a nondestructive monitoring technology for the corrosion of the steel bar of a newly cast reinforced concrete structure based on a magnetic field principle, and the monitoring technology consists of a separate sensor and an external sensor: the inner magnetic core of the separated sensor is embedded in the reinforced concrete structure, and the outer magnetic core is arranged outside the reinforced concrete structure; the inner magnetic core is fixed at the left end and the right end of the two fixed elastic strips; when the inner magnetic core and the outer magnetic core are connected with the magnetic circuit, the magnetic circuit passes through the corrosion area of the non-uniform corrosion reinforcing steel bar of the non-corner reinforcing steel bar, and the corrosion condition of the non-corner single detection reinforcing steel bar of the reinforced concrete structure can be effectively judged through the Hall voltage obtained by testing; the external sensor is externally arranged outside the reinforced concrete structure; the bayonet of the magnetic core is designed into a trapezoidal bayonet, so that the reinforced concrete square column can be effectively clamped, and the corrosion condition of a single detection reinforcing steel bar at the corner of the reinforced concrete square column can be effectively detected; the magnetic circuit passes through the non-uniform corrosion steel bar corrosion area of the corner steel bar and is symmetrically arranged through the Hall sensors so as to accurately detect the position of the steel bar; the separated sensor and the external sensor are 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 so as to solve the problem that no effective method for measuring the corrosion rate of the steel bar of the reinforced concrete structure exists at present.
In order to solve the technical problems, the invention provides the following technical scheme:
a non-uniform corrosion nondestructive monitoring sensor for a newly cast reinforced concrete structural steel bar based on a magnetic field principle comprises a magnetic induction intensity monitoring unit and a data processing unit, wherein the magnetic induction intensity monitoring unit comprises an external sensor and a separate sensor, and the external sensor comprises an external sensor left magnetic core, an external sensor right magnetic core, an external sensor permanent magnet, a first Hall sensor, a second Hall sensor and an external sensor packaging shell; the separated sensor comprises a separated sensor permanent magnet, an inner magnetic core, an outer magnetic core, a separated sensor embedded part packaging shell, a separated sensor external part packaging shell and a third Hall sensor; the external sensor packaging outer shell comprises an external sensor inner shell and an external sensor packaging cover; the external sensor inner shell comprises an external sensor permanent magnet placing groove, a left magnetic core placing groove, a right magnetic core placing groove, a fifth fixing hole, a sixth fixing hole, a second cable bending space and a second cable hole; the separated sensor embedded part packaging outer shell comprises a sensor embedded part inner shell and a sensor embedded part packaging cover; the sensor embedded part inner shell comprises a first fixing strip, a second fixing strip and an inner magnetic core placing groove; the first fixing strip and the second fixing strip are respectively provided with a first channel hole, a second channel hole, a third channel hole and a fourth channel hole; the first fixing strip, the second fixing strip and the embedded part packaging cover all comprise a first fixing hole and a second fixing hole; the external part packaging outer shell of the separated sensor comprises an internal shell of the external part of the sensor and a packaging cover of the external part of the sensor; the external part inner shell comprises a permanent magnet placing groove, an outer magnetic core placing groove, a third fixing hole, a fourth fixing hole, a first cable bending space and a first cable hole;
the data processing unit comprises a signal collector, a signal processor and a central controller, wherein the input end of the signal collector is electrically connected with the signal output end of the Hall sensor, and the signal output end of the signal processor is electrically connected with the port of the central controller.
Further, interior magnetic core and outer magnetic core be the rectangle bayonet socket, left magnetic core of external sensor and the right magnetic core of external sensor be trapezoidal bayonet socket, interior magnetic core, outer magnetic core, the left magnetic core of external sensor and the right magnetic core of external sensor be the silicon steel material, external sensor permanent magnet and disconnect-type sensor permanent magnet be neodymium nickel boron material, the external partial encapsulation shell of disconnect-type sensor, the internal partial encapsulation shell of burying of disconnect-type sensor and external sensor encapsulation shell be the plastics material.
Still further, the inner magnet core is embedded in the reinforced concrete structure.
The external magnetic core and the external sensor are arranged outside the reinforced concrete structure.
The first fixing hole, the second fixing hole, the third fixing hole, the fourth fixing hole, the fifth fixing hole and the sixth fixing hole are threaded holes.
The embedded part packaging shell of the separated sensor is provided with 4 channels, the 2 channels are a first fixing strip and a second fixing strip and are used for fixing the internal magnetic core and the embedded part packaging shell of the separated sensor, and the other 2 channels are internal magnetic core placing grooves and are used for placing the internal magnetic core.
The inner magnetic core and the embedded part of the separated sensor are respectively fixed with the left side detection reinforcing steel bar and the right side detection reinforcing steel bar through a first elastic strip and a second elastic strip through a first channel hole, a second channel hole, a third channel hole and a fourth channel hole.
The first fixing strip, the second fixing strip and the embedded part of the separated sensor packaging cover comprise a first fixing hole and a second fixing hole, and corresponding screws and nuts are used for bolt connection during installation.
The external sensor inner shell and the external sensor packaging cover comprise a fifth fixing hole and a sixth fixing hole, and corresponding screws and nuts are used for bolt connection during installation.
The external part inner shell of the sensor and the external part packaging cover comprise a third fixing hole and a fourth fixing hole, and corresponding screws and nuts are used for bolt connection during assembly.
The device comprises a separation type sensor, an external sensor and a signal collector, wherein a first indicator lamp and a second indicator lamp are installed between the separation type sensor and the external sensor and the signal collector, and the first indicator lamp and the second indicator lamp prompt whether the external sensor, the separation type sensor and the signal collector work normally or not.
The Hall sensor can be arranged with 1 or more sensors according to the precision requirement and the actual engineering requirement.
As an improvement, the permanent magnet, the external sensor permanent magnet, the external magnetic core, the external sensor left magnetic core and the external sensor right magnetic core are required to be placed in a magnetic insulation environment after detection, so that the influence of demagnetization of the permanent magnet on detection precision is avoided.
As an improvement, the outer magnetic core can be used for monitoring corresponding to a plurality of inner magnetic cores, and the reuse and flow monitoring can be realized.
As an improvement, the external sensor corresponds to a plurality of reinforced concrete structure monitoring, and can be used repeatedly and used for flow monitoring.
As an improvement, the external part of the separated sensor packaging shell and the external sensor packaging shell contain a bending space for connecting a circuit board with a cable so as to ensure that the circuit can be effectively bent.
As an improvement, the data processing unit and the related control circuit can be realized by using the existing mature technology, and mainly comprises the steps of measuring the Hall voltage of the Hall sensor so as to calculate the corrosion rate. The Hall voltage measuring system and the data processing system finish data storage, post-processing and real-time display through the signal processor and the central controller.
The working principle of the invention is as follows: hall voltage of the Hall voltage detection unit of the Hall sensor is sent to the signal processor; the signal processor collects the data of the signal collector according to the set frequency, calculates and analyzes the data, stores the collected data and the calculation result in the central controller in real time, and displays the analysis and calculation result in real time by the display.
The invention has the beneficial effects that: the invention is based on a nondestructive testing method, realizes the nondestructive monitoring of the non-uniform corrosion of the reinforcing steel bars by applying a magnetic induction technology and adopting a separate and external sensor testing method with unique innovation, and calculates the corrosion rate of the reinforcing steel bars according to a theoretical formula. The limit of the test stability, accuracy and using times of the traditional test method is broken through, and the test of the corrosion rate of the reinforced concrete structure steel bar is realized; 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 external sensor can be used for detecting a plurality of reinforced concrete structures of people, and has the advantages of clear principle, simple and convenient method, high detection speed, repeated use, good stability and the like, and the defects of the conventional method and the conventional equipment for detecting the corrosion rate of the reinforced steel bar can be overcome.
Drawings
Fig. 1 is a schematic diagram of the working structure of the sensor of the present invention.
FIG. 2 is a three-dimensional schematic view of an inner housing of an external portion of a discrete sensor according to the present invention.
FIG. 3 is a three-dimensional view of an internal housing of an external portion of a discrete sensor in accordance with the present invention.
FIG. 4 is a schematic view of the external part of the package cover of the separated sensor according to the present invention.
Fig. 5 is a schematic view of the concrete external magnetic core.
Fig. 6 is a schematic view of a concrete inner magnetic core.
Fig. 7 is a three-dimensional schematic diagram of an inner shell of a buried part of a split sensor.
Fig. 8 is a three-dimensional view of an inner housing of a separate sensor embedded portion.
Fig. 9 is a schematic view of a separate sensor embedded part packaging cover.
FIG. 10 is a three-dimensional schematic view of an external sensor package housing.
FIG. 11 is a three-dimensional view of an external sensor package.
FIG. 12 is a three-dimensional view of an external sensor package cover.
Fig. 13 is a graph in which the reinforced concrete specimen is moved in the x and y directions, and test data of the hall voltage, the x coordinate value, and the y coordinate value of the third hall sensor is recorded.
Fig. 14 is a graph in which the reinforced concrete specimen is moved in the z direction, and test data of the hall voltage and the z coordinate value of the third hall sensor are recorded.
Reference numbers in the figures: 1. a reinforced concrete test piece; 2. an internal magnetic core in concrete; 3-1, detecting the reinforcing steel bars at the left side corners; 3-2, detecting the steel bars at the right side corners; 4. detecting the steel bars in the middle; 5-1, a first elastic strip; 5-2, a second elastic strip; 6-1, a first Hall sensor; 6-2, a second Hall sensor; 6-3, a third Hall sensor; 7. a permanent magnet; 8. a concrete outer magnetic core; 9-1, a first circuit indicator light; 9-2, a second circuit indicator light; 10. a signal collector; 11. a signal processor; 12. a central controller; 13. an external sensor permanent magnet; 14. a left magnetic core of the external sensor; 15. the external sensor right magnetic core; 16. an external sensor packaging shell; 16-1, placing a permanent magnet placing groove of the external sensor; 16-2, placing a left magnetic core placing groove of the external sensor; 16-3; a right magnetic core placing groove of the external sensor; 16-4, a fifth fixing hole; 16-5 and a sixth fixing hole; 16-6, a second wire hole; 16-7, a second cable bending space; 16-8, an external sensor packaging cover; 17. the embedded part of the separated sensor encapsulates the shell; 17-1, a first passage hole; 17-2, a second channel hole; 17-3, a third channel hole; 17-4, a fourth channel hole; 17-5, a first fixing strip; 17-6, a second fixing strip; 17-7 parts of inner magnetic core placing grooves, 17-8 parts of inner magnetic core placing grooves and first fixing holes; 17-9, second fixing holes; 17-10, embedding part of a packaging cover in the separated sensor; 18. a separate external partial enclosure; 18-1, placing a permanent magnet groove; 18-2, placing grooves for the external magnetic cores; 18-3, a third fixing hole; 18-4, a fourth fixing hole; 18-5, a first wire hole; 18-6, a first cable bending space; 18-7, and an external part packaging cover of the separated sensor.
Detailed Description
The invention will be further explained with reference to the drawings
Referring to fig. 1 to 9, a reinforcing steel bar corrosion nondestructive monitoring sensor based on a magnetic field principle comprises a magnetic induction intensity monitoring unit and a data processing unit, wherein the magnetic induction intensity monitoring unit comprises an external sensor and a separate sensor, and the external sensor comprises an external sensor left magnetic core 14, an external sensor right magnetic core 15, an external sensor permanent magnet 13, a first hall sensor 6-1, a second hall sensor 6-2 and an external sensor packaging shell 16; the separated sensor comprises a separated sensor permanent magnet 7, an inner magnetic core 2, an outer magnetic core 8, a separated sensor embedded part packaging shell 17, a separated sensor external part packaging shell 18 and a third Hall sensor 6-3; the external sensor packaging outer shell comprises an external sensor inner shell and an external sensor packaging cover 16-8; the external sensor inner shell comprises an external sensor permanent magnet placing groove 16-1, a left magnetic core placing groove 16-2, a right magnetic core placing groove 16-3, a fifth fixing hole 16-4, a sixth fixing hole 16-5, a second cable bending space 16-7 and a second cable hole 16-7; the separated sensor embedded part packaging outer shell comprises a sensor embedded part inner shell and a sensor embedded part packaging cover 17-10; the inner shell of the embedded part of the sensor comprises a first fixing strip 17-5, a second fixing strip 17-6 and an inner magnetic core placing groove 17-7; the first fixing strip 17-5 and the second fixing strip 17-6 are respectively provided with a first channel hole 17-1, a second channel hole 17-2, a third channel hole 17-3 and a fourth channel hole 17-4; the first fixing strip 17-5, the second fixing strip 17-6 and the embedded part packaging cover 17-10 all comprise a first fixing hole 17-8 and a second fixing hole 17-9; the external part packaging shell 18 of the separated sensor comprises an internal shell of the external part of the sensor and a packaging cover 18-7 of the external part of the sensor; the external part inner shell comprises a permanent magnet placing groove 18-1, an outer magnetic core placing groove 18-2, a third fixing hole 18-3, a fourth fixing hole 18-4, a first cable bending space 18-6 and a first wire hole 18-5.
The data processing unit comprises a signal collector 10, a signal processor 11 and a central controller 12, wherein the input end of the signal collector 10 is electrically connected with the signal output end of the Hall sensor, and the signal output end of the signal processor 11 is electrically connected with a port of the central controller 12.
Furthermore, the inner magnetic core 2 and the outer magnetic core 8 are rectangular bayonets.
The left magnetic core 14 of the external sensor and the right magnetic core 15 of the external sensor are trapezoidal bayonets.
The inner magnetic core 2, the outer magnetic core 8, the left external sensor magnetic core 14 and the right external sensor magnetic core 15 are made of silicon steel.
The external sensor permanent magnet 13 and the separated sensor permanent magnet 7 are made of neodymium-nickel-boron materials.
The external part packaging shell 18 of the separated sensor, the internal part packaging shell 17 of the separated sensor and the external sensor packaging shell 16 are made of plastic materials.
The inner magnetic core 2 is embedded in the reinforced concrete structure.
The external magnetic core 8 and the external sensor are arranged outside the reinforced concrete structure.
The first fixing hole 17-8, the second fixing hole 17-9, the third fixing hole 18-3, the fourth fixing hole 18-4, the fifth fixing hole 16-4 and the sixth fixing hole 16-5 are threaded holes.
The embedded part packaging shell of the separated sensor is provided with 4 channels, 2 channels are a first fixing strip 17-5 and a second fixing strip 17-6 and are used for fixing the internal magnetic core 2 and the embedded part packaging shell 17 of the separated sensor, and the other 2 channels are internal magnetic core placing grooves 17-7 and are used for placing the internal magnetic core 2.
The inner magnetic core 2 and the embedded part packaging shell 17 of the split type sensor are fixed with the left detection steel bar 3-1 and the right detection steel bar 3-2 through a first elastic strip 5-1 and a second elastic strip 5-2 respectively through a first channel hole 17-1, a second channel hole 17-2, a third channel hole 17-3 and a fourth channel hole 17-4.
The first fixing strip 17-5, the second fixing strip 17-6 and the embedded part packaging cover 17-10 of the separated sensor comprise a first fixing hole 17-8 and a second fixing hole 17-9, and corresponding screws and nuts are used for bolt connection during installation.
The external sensor inner shell and the external sensor packaging cover 16-8 comprise a fifth fixing hole 16-4 and a sixth fixing hole 16-5, and corresponding screws and nuts are used for bolt connection during installation.
The sensor external part inner shell and the external part packaging cover 18-7 comprise a third fixing hole 18-3 and a fourth fixing hole 18-4, and corresponding screws and nuts are used for bolt connection during installation.
A first indicator light 9-1 and a second indicator light 9-2 are arranged between the separated sensor and the external sensor and the signal collector 10, and the first indicator light 9-1 and the second indicator light 9-2 prompt whether the external sensor, the separated sensor and the signal collector 10 work normally or not.
The Hall sensor can be arranged with 1 or more sensors according to the precision requirement and the actual engineering requirement.
As an improvement, the permanent magnet 7, the external sensor permanent magnet 13, the external magnetic core 8, the external sensor left magnetic core 14 and the external sensor right magnetic core 15 need to be placed in a magnetic isolation environment after detection, so that the influence of demagnetization of the permanent magnet on detection precision is avoided.
As a modification, the outer magnetic core 8 can be monitored corresponding to a plurality of inner magnetic cores 2, and the reuse and flow monitoring can be realized.
As an improvement, the external sensor corresponds to a plurality of reinforced concrete structures 1 for monitoring, and can be used repeatedly and used for flow monitoring.
As an improvement, the external part of the separated sensor packaging shell 18 and the external sensor packaging shell 16 contain circuit boards which are connected with a first cable bending space 18-6 and a second cable bending space 16-7, so that the circuit can be effectively bent.
As an improvement, the data processing unit and the related control circuit can be realized by using the existing mature technology, and mainly comprises the steps of measuring the Hall voltage of the Hall sensor so as to calculate the corrosion rate. The Hall voltage measuring system and the data processing system complete data storage, post-processing and real-time display through the signal processor 11 and the central controller 12.
The testing method of the non-uniform corrosion nondestructive monitoring sensor for the newly-poured reinforced concrete structural steel bar based on the magnetic field principle takes the HPB300 smooth round steel bar with the diameter of 16mm as an example, and comprises the following steps of:
firstly, preparing a reinforced concrete test piece 1 before being tested, wherein the process is as follows:
1.1 taking an optical round steel bar with the length of 400cm and the diameter of 16mm as a calibration steel bar, a middle steel bar to be measured 4, a left steel bar to be measured 3-1 and a right steel bar to be measured 3-2, and weighing the mass m of the steel bar to be measured1I，m2I，m3I，m4I，m5I，m6I，m7IAnd calibrating the steel bar mass m0And recording;
1.2 the calibration reinforcing steel bar and the reinforcing steel bar to be measured are coated with epoxy resin at the position of 20cm which is the half length of the two ends, the left side is measured, the distance between the reinforcing steel bar to be measured 3-1 and the right side reinforcing steel bar 3-2 and the calibration reinforcing steel bar and the middle reinforcing steel bar to be measured 4 is 25mm, and the concrete is prepared from the following raw materials: the cement is P.I 525 grade Portland cement, the sand adopts river sand with fineness modulus of 2.6, the coarse aggregate adopts continuous graded broken stone (the maximum grain diameter is 25mm), the water adopts tap water, the effective section size of a test piece poured in the mould is 150mm multiplied by 150mm, the length of the steel bar is 400mm, the protruding length of the steel bars at two sides is 50mm, and the length of the test piece is 300 mm;
second, preparation before measurement, as follows:
2.1, the inner magnetic core 2 is placed in an inner magnetic core placing groove 17-7, and the inner shell of the embedded part of the split sensor is connected with the packaging cover 17-10 of the embedded part of the split sensor through a first fixing hole 17-8 and a second fixing hole 17-9 by bolts and nuts; respectively placing an outer magnetic core 8 and a permanent magnet 7 into an outer magnetic core placing groove 18-2 and a permanent magnet placing groove 18-1, installing a third Hall sensor 6-3 and a circuit board, bending a cable at a first cable bending space 18-6, externally connecting a first indicator lamp 9-1 and a signal collector 10 through a first cable hole 18-5, and finally connecting an inner shell of the external part of the sensor and an encapsulation cover 18-7 of the external part of the sensor through a third fixing hole 18-3 and a fourth fixing hole 18-4 by bolts and nuts;
2.2, an external sensor left magnetic core 14, an external sensor right magnetic core 15 and an external sensor permanent magnet 13 are respectively placed into an external sensor left magnetic core placing groove 16-2, an external sensor right magnetic core placing groove 16-3 and an external sensor permanent magnet placing groove 16-1, a first Hall sensor 6-1, a second Hall sensor 6-2 and a circuit board are installed, a cable is bent at a second cable bending space 16-7 and is externally connected with a second indicator lamp 9-2 and a signal collector 10 through a second cable hole 16-6, and finally, an external sensor inner shell and an external sensor packaging cover 16-8 are connected through a fifth fixing hole 16-4 and a sixth fixing hole 16-5 by bolts and nuts;
2.3 after the inner magnetic core 2 is packaged by the embedded part of the packaging shell 17 of the separated sensor, a first elastic strip 5-1 and a second elastic strip 5-2 are required to be fixed on a left reinforcing steel bar 3-1 and a right reinforcing steel bar 3-2 through a first channel hole 17-1, a second channel hole 17-2, a third channel hole 17-3 and a fourth channel hole 17-4, the inner magnetic core is placed in a mold for casting molding, the inner magnetic core is maintained for 28 days under standard conditions, a casting molding calibration reinforced concrete test piece and a to-be-tested reinforced concrete test piece are soaked in a standard salt concentration solution until the inner magnetic core is saturated with salt, and the concentration of the standard sodium chloride solution is 0.1-2 mol/L;
2.4 the external part of the separated sensor is packaged by a packaging shell of the external part of the separated sensor and then is placed on a reinforced concrete test piece and is communicated with the internal magnetic core and the monitoring reinforced magnetic circuit, the external sensor is packaged by an external sensor packaging shell 16 and then is clamped at the corner of the reinforced concrete structure and is connected with the monitoring reinforced magnetic circuit, the central controller 12 is used for controlling the acquisition frequency of the signal acquisition device 10, the sensor is electrified and tested to ensure that the first Hall sensor 6-1, the second Hall sensor 6-2 and the third Hall sensor 6-3 carry out normal acquisition work, and a marker pen is used for marking the initial positions of the external part of the separated sensor and the external sensor;
thirdly, a calibration test is carried out, and the process is as follows:
3.1 recording mass m1I，m2I，m3I，m4I，m5I，m6I，m7IHall voltage V of corresponding steel bar calibrated before corrosion of reinforced concrete test piece1I，V2I，V3I，V4I，V5I，V6I， V7I；
3.2 marking the placement positions of the external part of the separated sensor and the external sensor on the surface of the concrete through a marker pen to ensure in-situ monitoring;
3.3 simulation experiment of reinforcing bar corrosion is realized with the mode of corrosion is accelerated to the electric current, and control current density is the same, and the quality is m1I，m2I，m3I，m4I，m5I，m6I，m7ICorresponding reinforced concrete test piece is electrified at equal intervals t1，t2，t3，t4，t5，t6，t7；
3.4 record the Hall voltage data V of the calibrated steel bar after the reinforced concrete test piece is corroded1II， V2II，V3II，V4II，V5II，V6II，V7IIAnd steel bar quality data m1II，m2II，m3II，m4II， m5II，m6II，m7II；
3.5 respectively calculating and calibrating the change rate Delta m of the steel bar quality1，△m2，△m3，△m4，△ m5，△m6，△m7The calculation formulas are respectively formulas (1) to (7);
3.6 separately calculating and calibrating Hall voltage delta V of reinforcing steel bar1，△V2，△V3，△V4，△V5，△V6，△V7The calculation formulas are respectively the formulas (8) to (14)
3.7, performing linear fitting on the relationship between the steel bar mass change rate and the Hall voltage to obtain a linear relationship coefficient alpha;
step four, measuring the test, the process is as follows:
4.1 recording Hall voltage V before corrosion of a piece to be tested0I；
4.2 placing the reinforced concrete to be tested in an environment which is easy to cause the reinforcing steel bars to be corroded, such as a dry-wet cycle environment, so as to cause the reinforcing steel bars to be corroded;
4.3 the external part of the separated sensor and the external sensor are put back to the original position, and the Hall voltage V after the steel bar is corroded is recorded0II；
4.4 Corrosion Rate P of Steel barsIIThe calculation formula is formula (15)
PII＝α(V0II-V0I) (15)。
Example 1: use the actual reinforced concrete roof beam of engineering as the test case, the bottom of the beam reinforcing bar is 3 HRB400 ribbed steel bars of diameter 20mm, and the beam reinforcing bar interval of the left and right sides is 25mm, and the reinforcing bar is built up to upper portion and is 2 HPB300 smooth round steel bars that the diameter is 16mm, and the raw and other materials of concrete are: the cement is P.I 525 grade Portland cement, the sand adopts river sand with fineness modulus of 2.6, the coarse aggregate adopts continuous graded broken stone (the maximum grain diameter is 25mm), the water adopts tap water, the effective section size of a casting sample in a standard mould is 150mm multiplied by 150mm, the beam length is 1m, the standard maintenance is carried out in a maintenance room for 28d after the casting forming, and the concrete beam cast by taking the concrete beam as an example makes specific explanation on the actual engineering reinforced concrete beam corrosion prediction:
1. testing method steps according to actual size of engineering reinforced concrete beam
1.1-3.7, carrying out indoor test calibration, and carrying out linear fitting on the relationship between the steel bar mass change rate and the Hall voltage to obtain a linear relationship coefficient alpha.
2. The left magnetic core 14 of the external sensor, the right magnetic core 15 of the external sensor and the permanent magnet 13 of the external sensor are respectively placed in the left magnetic core placing groove 16-2 of the external sensor, the right magnetic core placing groove 16-3 of the external sensor and the permanent magnet placing groove 16-1 of the external sensor, the first Hall sensor 6-1, the second Hall sensor 6-2 and a circuit board are installed, the cable is bent at the bending space 16-7 of the second cable, the second indicator lamp 9-2 and the signal collector 10 are externally connected through the second wire hole 16-6, and finally the internal shell of the external sensor and the packaging cover 16-8 of the external sensor are connected through a fifth fixing hole 16-4 and a sixth fixing hole 16-5 by bolts and nuts.
3. The inner magnetic core 2 is placed in an inner magnetic core placing groove 17-7, and a bolt and a nut are used for connecting an inner shell of the embedded part of the sensor with an encapsulation cover 17-10 of the embedded part through a first fixing hole 17-8 and a second fixing hole 17-9; an external magnetic core 8 and a permanent magnet 7 are respectively placed in an external magnetic core placing groove 18-2 and a permanent magnet placing groove 18-1, a third Hall sensor 6-3 and a circuit board are installed, a cable is bent in a cable bending space 18-6 and is externally connected with a signal collector 10 through a wire hole 18-5, and finally an inner shell of the external part of the sensor and an encapsulation cover 18-7 of the external part are connected through a bolt and a nut through a third fixing hole 18-3 and a fourth fixing hole 18-4.
4. After the internal magnetic core 2 is packaged by the packaging shell 17 of the embedded part of the separated sensor, a first elastic strip 5-1 and a second elastic strip 5-2 are required to be fixed on a left reinforcing steel bar 3-1 and a right reinforcing steel bar 3-2 through a first channel hole 17-1, a second channel hole 17-2, a third channel hole 17-3 and a fourth channel hole 17-4, the internal magnetic core is placed in a mould for casting molding, and is maintained for 28 days under standard conditions,
5. the external part of the separated sensor is packaged by a packaging shell of the external part of the separated sensor and then is arranged on the reinforced concrete beam and is communicated with the internal magnetic core and the monitoring reinforced magnetic circuit, the external sensor is packaged by an external sensor packaging shell 16 and then is clamped at the corner of the reinforced concrete beam, the external sensor is connected with the monitoring reinforced magnetic circuit, the central controller 12 is used for controlling the acquisition frequency of the signal acquisition device 10, the sensor is electrified and tested, the first Hall sensor 6-1, the second Hall sensor 6-2 and the third Hall sensor 6-3 are ensured to perform normal acquisition work, and a marker pen is used for marking the initial positions of the external part of the separated sensor and the external sensor;
6. after the actual reinforced concrete beam is corroded for a certain time under natural conditions, the external part of the separate sensor and the external sensor are put back to the original position, and the Hall voltage V after the reinforced concrete beam is corroded is recorded2II；
7. Corrosion rate P of rusted steel bar in reinforced concrete beamIIThe calculation formula is formula (16)
PII＝α(V2II-V2I) (16)。
Example 2: the diameter of the steel bar is 16mm, the length of the steel bar is 20cm, and the steel bar is HPB300 smooth round steel bar, and the concrete comprises the following raw materials: the cement is P.I 525 grade Portland cement, the sand adopts river sand with fineness modulus of 2.6, the coarse aggregate adopts continuous graded broken stone (the maximum grain diameter is 25mm), the water adopts tap water, the effective section dimension of a cast test piece in a standard die is 100mm multiplied by 100mm, the length of a steel bar is 200mm, the protruding length of the steel bars at two sides is 50mm, the length of the test piece is 100mm, the standard maintenance is carried out in a maintenance room for 28d after the cast molding, and the influence of the position change of the steel bar on the magnetic induction intensity of an external sensor is specifically explained by taking the cast reinforced concrete test piece as an example:
the x-axis is established in the front-back direction, the y-axis is established in the left-right direction, and the z-axis is established in the up-down direction. And (3) moving the reinforced concrete test piece 1 to the centers of the bayonets of the left magnetic core 14 and the right magnetic core 15 of the external sensor, and defining the three-dimensional relative coordinate value (x, y, z) of the bayonets of the magnetic cores at the moment as (0,0, 0).
The reinforced concrete test piece 1 is made to move along the z direction, the Hall voltage and the z coordinate value of the third Hall sensor 6-3 are recorded, the test data are shown in figure 14, the Hall voltage monitoring value can not be changed when the effective length of the steel bar in the bayonet area is not changed according to the test data, and the Hall voltage monitoring value can be remarkably reduced when the moving distance of the steel bar along the z direction is increased to the effective length of the steel bar in the bayonet area and is reduced.
The reinforced concrete test piece 1 is moved along the x direction and the y direction, the Hall voltage, the x coordinate value and the y coordinate value of the third Hall sensor 6-3 are recorded, the test data is shown in figure 13, and the test data shows that the influence on the magnetic induction intensity monitoring value is great when the steel bar moves along the x direction and the y direction, so the in-situ monitoring is required to be kept in the corrosion test process.
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 (10)
1. The non-uniform corrosion nondestructive monitoring sensor for the newly cast reinforced concrete structural steel bar based on the magnetic field principle is characterized by comprising a magnetic induction intensity monitoring unit and a data processing unit, wherein the magnetic induction intensity monitoring unit comprises an external sensor and a separate sensor, and the external sensor comprises an external sensor left magnetic core, an external sensor right magnetic core, an external sensor permanent magnet, a first Hall sensor, a second Hall sensor and an external sensor packaging shell; the separated sensor comprises a separated sensor permanent magnet, an inner magnetic core, an outer magnetic core, a separated sensor embedded part packaging shell, a separated sensor external part packaging shell and a third Hall sensor; the external sensor packaging outer shell comprises an external sensor inner shell and an external sensor packaging cover; the external sensor inner shell comprises an external sensor permanent magnet placing groove, a left magnetic core placing groove, a right magnetic core placing groove, a fifth fixing hole, a sixth fixing hole, a second cable bending space and a second cable hole; the separated sensor embedded part packaging outer shell comprises a sensor embedded part inner shell and a sensor embedded part packaging cover; the sensor embedded part inner shell comprises a first fixing strip, a second fixing strip and an inner magnetic core placing groove; the first fixing strip and the second fixing strip are respectively provided with a first channel hole, a second channel hole, a third channel hole and a fourth channel hole; the first fixing strip, the second fixing strip and the embedded part packaging cover all comprise a first fixing hole and a second fixing hole; the external part packaging outer shell of the separated sensor comprises an internal shell of the external part of the sensor and a packaging cover of the external part of the sensor; the external part inner shell comprises a permanent magnet placing groove, an outer magnetic core placing groove, a third fixing hole, a fourth fixing hole, a first cable bending space and a first cable hole;
the data processing unit comprises a signal collector, a signal processor and a central controller, wherein the input end of the signal collector is electrically connected with the signal output end of the Hall sensor, and the signal output end of the signal processor is electrically connected with the port of the central controller.
2. The non-uniform corrosion nondestructive monitoring sensor for the newly poured reinforced concrete structural steel bar based on the magnetic field principle as claimed in claim 1, wherein the inner magnetic core and the outer magnetic core are rectangular bayonets, the left magnetic core and the right magnetic core of the external sensor are trapezoidal bayonets and are made of silicon steel, the permanent magnet is made of neodymium-nickel-boron, and the external part packaging shell of the separate sensor, the internal part packaging shell of the separate sensor and the external sensor packaging shell are made of plastic.
3. The non-uniform corrosion nondestructive monitoring sensor for the newly poured reinforced concrete structure steel bar based on the magnetic field principle as claimed in claim 1 or 2, wherein the inner magnetic core is embedded in the reinforced concrete structure, and the outer magnetic core and the external sensor are externally arranged outside the reinforced concrete structure.
4. The non-uniform corrosion nondestructive monitoring sensor for the newly cast reinforced concrete structural steel bar based on the magnetic field principle as recited in claim 1 or 2, wherein the first fixing hole, the second fixing hole, the third fixing hole, the fourth fixing hole, the fifth fixing hole and the sixth fixing hole are threaded holes.
5. The non-uniform corrosion nondestructive monitoring sensor for the newly poured reinforced concrete structural steel bar based on the magnetic field principle as claimed in claim 1 or 2, wherein the embedded part packaging shell of the split type sensor has 4 channels, 2 channels are a first fixing strip and a second fixing strip for fixing the internal magnetic core and the embedded part packaging shell of the split type sensor, and the other 2 channels are internal magnetic core placing grooves for placing the internal magnetic core.
6. The non-uniform corrosion nondestructive monitoring sensor for the newly poured reinforced concrete structural steel bar based on the magnetic field principle as claimed in claim 1 or 2, wherein the inner magnetic core and the embedded part packaging shell of the separate sensor are fixed with the left side detection steel bar and the right side detection steel bar through a first elastic strip and a second elastic strip respectively through a first channel hole, a second channel hole, a third channel hole and a fourth channel hole.
7. The non-uniform corrosion nondestructive monitoring sensor for the newly poured reinforced concrete structural steel bar based on the magnetic field principle as claimed in claim 1 or 2, wherein the first fixing strip, the second fixing strip and the split sensor embedded part packaging cover comprise a first fixing hole and a second fixing hole, and are bolted by using corresponding screws and nuts during installation, and the sensor external part inner shell and the external part packaging cover comprise a third fixing hole and a fourth fixing hole, and are bolted by using corresponding screws and nuts during installation.
8. The nondestructive monitoring sensor for the non-uniform corrosion of the newly cast reinforced concrete structural steel bar based on the magnetic field principle as claimed in claim 1 or 2, wherein the external sensor inner shell and the external sensor packaging cover comprise a fifth fixing hole and a sixth fixing hole, and are connected by bolts and nuts corresponding to each other during installation.
9. The non-uniform corrosion nondestructive monitoring sensor for the newly cast reinforced concrete structural steel bar based on the magnetic field principle as recited in claim 1 or 2, characterized in that a first indicator light and a second indicator light are installed between the separated sensor and the external sensor and the signal collector, and the first indicator light and the second indicator light prompt whether the external sensor, the separated sensor and the signal collector work normally or not.
10. The non-uniform corrosion nondestructive monitoring sensor for the newly poured reinforced concrete structural steel bar based on the magnetic field principle as claimed in claim 1 or 2, wherein the Hall sensor is provided with 1 or more sensors;
the permanent magnet, the external sensor permanent magnet, the external magnetic core, the external sensor left magnetic core and the external sensor right magnetic core are required to be placed in a magnetic isolation environment after detection;
the external magnetic core can be monitored corresponding to the internal magnetic cores, and the external sensor can be used for monitoring the reinforced concrete structures repeatedly and monitoring the flow;
the external part packaging shell of the separated sensor and the external sensor packaging shell contain a bending space for connecting a circuit board with a cable;
the data processing unit calculates the corrosion rate by measuring the Hall voltage of the Hall sensor, and the Hall voltage measuring system and the data processing system finish data storage, post-processing and real-time display through the signal processor and the central controller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021785887.7U CN212904662U (en) | 2020-08-24 | 2020-08-24 | Non-uniform corrosion nondestructive monitoring sensor for newly-poured reinforced concrete structural steel bar |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021785887.7U CN212904662U (en) | 2020-08-24 | 2020-08-24 | Non-uniform corrosion nondestructive monitoring sensor for newly-poured reinforced concrete structural steel bar |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212904662U true CN212904662U (en) | 2021-04-06 |
Family
ID=75247014
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021785887.7U Active CN212904662U (en) | 2020-08-24 | 2020-08-24 | Non-uniform corrosion nondestructive monitoring sensor for newly-poured reinforced concrete structural steel bar |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212904662U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112114027A (en) * | 2020-08-24 | 2020-12-22 | 浙江工业大学 | Non-uniform corrosion nondestructive monitoring sensor and testing method for newly-poured reinforced concrete structural steel bar based on magnetic field principle |
-
2020
- 2020-08-24 CN CN202021785887.7U patent/CN212904662U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112114027A (en) * | 2020-08-24 | 2020-12-22 | 浙江工业大学 | Non-uniform corrosion nondestructive monitoring sensor and testing method for newly-poured reinforced concrete structural steel bar based on magnetic field principle |
| CN112114027B (en) * | 2020-08-24 | 2023-12-22 | 浙江工业大学 | Non-uniform rust nondestructive monitoring sensor for newly cast steel bar concrete structure steel bar |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110646505A (en) | External reinforcement corrosion nondestructive monitoring sensor based on electromagnetic field principle and testing method | |
| CN112034035A (en) | Non-uniform corrosion nondestructive monitoring sensor and testing method for existing reinforced concrete structure steel bar based on magnetic field principle | |
| CN110646504B (en) | External steel bar corrosion in-situ nondestructive monitoring test device based on electromagnetic field principle | |
| CN112034034A (en) | Veneering type steel bar non-uniform corrosion monitoring sensor based on magnetic field principle and testing method | |
| CN112114027B (en) | Non-uniform rust nondestructive monitoring sensor for newly cast steel bar concrete structure steel bar | |
| CN212904659U (en) | Separated type sensor for monitoring non-uniform corrosion of reinforcing steel bar based on magnetic field principle | |
| CN212904662U (en) | Non-uniform corrosion nondestructive monitoring sensor for newly-poured reinforced concrete structural steel bar | |
| CN113125551B (en) | Built-in magnetic sensor with double magnetic circuits and four measuring points and testing method thereof | |
| JP2019007842A (en) | Drying shrinkage distortion prediction method of concrete and prediction method of drying shrinkage stress of concrete | |
| CN211785310U (en) | External steel bar corrosion nondestructive monitoring sensor based on electromagnetic field principle | |
| CN113237588B (en) | Support axial force monitoring method and system considering concrete shrinkage and creep influence | |
| CN212904661U (en) | Non-uniform corrosion nondestructive monitoring sensor for existing reinforced concrete structure steel bar | |
| CN112034033B (en) | Separated type reinforcing steel bar non-uniform corrosion monitoring sensor based on magnetic field principle | |
| CN212904660U (en) | Non-uniform corrosion monitoring sensor for veneered reinforcing steel bar based on magnetic field principle | |
| CN113155949B (en) | Combined magnetic sensor for monitoring non-uniform corrosion and axial corrosion of steel bar section and testing method thereof | |
| CN215218670U (en) | Combined magnetic sensor for monitoring non-uniform corrosion and radial corrosion of steel bar section | |
| JP2019020306A (en) | Method for predicting final value of drying shrinkage deformation of concrete | |
| CN211292716U (en) | External steel bar corrosion in-situ nondestructive monitoring test device based on electromagnetic field principle | |
| CN216433861U (en) | Range finding adjustable reinforcing bar corrosion magnetic induction sensor | |
| CN216747312U (en) | Steel bar multi-point corrosion calibration device suitable for built-in magnetic sensor | |
| CN113125550B (en) | Die for researching corrosion monitoring precision of faced magnetic sensor and testing method | |
| CN113866077A (en) | Steel bar corrosion evaluation method based on magnetic field principle | |
| CN113008976B (en) | Reinforcing steel bar corrosion calibration device and method suitable for three magnetic sensors | |
| CN214844969U (en) | Reinforcing steel bar corrosion device suitable for three kinds of magnetic sensors | |
| CN109100497A (en) | A kind of test method of Dry Shrinkage of Cement Mortar |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |