CN114216838A - Method for identifying concrete corrosion damage by implanted piezoelectric sensor - Google Patents
Method for identifying concrete corrosion damage by implanted piezoelectric sensor Download PDFInfo
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- CN114216838A CN114216838A CN202111411932.1A CN202111411932A CN114216838A CN 114216838 A CN114216838 A CN 114216838A CN 202111411932 A CN202111411932 A CN 202111411932A CN 114216838 A CN114216838 A CN 114216838A
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Abstract
The invention belongs to the technical field related to concrete structure health monitoring, and discloses a method for identifying concrete corrosion damage by an implanted piezoelectric sensor. The identification method comprises the following steps: s1, packaging the piezoelectric sensor, then putting the piezoelectric sensor into concrete to be identified as aggregate, vibrating the concrete, curing and forming; s2, exciting voltages are respectively led into the piezoelectric sensors before and after the concrete is in service, the piezoelectric sensors and the concrete to be identified generate resonance, and then admittance signals in the piezoelectric sensors are respectively collected, so that conductivity values before and after the concrete is in service are obtained; s3, calculating the MAPD damage index by using the conductivity values of the concrete before and after service, thereby realizing the identification of the concrete corrosion damage. By the method, the influence of water on the admittance of the sensor is isolated, and the interference is eliminated for the accurate corrosion damage identification of the steel bar in the concrete structure.
Description
Technical Field
The invention belongs to the technical field related to concrete structure health monitoring, and particularly relates to a method for identifying concrete corrosion damage by an implanted piezoelectric sensor.
Background
The reinforced concrete structure has strong concealment performance due to corrosion damage of the steel bars caused by chloride ion corrosion, concrete carbonization and the like and initial damage caused by corrosion. If the early tiny rust damage of the structure is not found in time, the accumulated damage of the structure can be caused, and the sudden collapse of the structure is caused. The early weak and potential corrosion damage of the structure can be identified accurately in time, which is a difficult problem in the field of structural engineering; the existing steel bar corrosion monitoring technology comprises a visual inspection method, an infrared thermal imaging method, a linear polarization resistance method and an alternating current impedance spectroscopy method; the drawbacks of these techniques are mainly: the reliable steel bar corrosion model is established relatively depending on the defects of strict requirements on monitoring environment, single monitoring information, incapability of providing long-term monitoring and the like.
The PZT-based piezoelectric impedance (EMI) technology is mainly based on local high-frequency excitation, and PZT is used as a sensor and a driver at the same time to obtain structural performance change information for the local excitation of a structure, so that the identification of the corrosion damage of the steel bar is realized; the method is based on the basic principle that a high-strength adhesive is used for adhering PZT to the surface of a steel bar or implanting the PZT into concrete, the PZT positive and negative piezoelectric effect is used, voltage is applied through a piezoelectric impedance instrument to locally excite the structure, monitoring signals related to structural performance (quality, rigidity, damping and the like) are obtained, the signals are used as the reference of structural health measurement, and whether the structure is corroded or not is identified through observing the change of the signals in the future. Due to the high-frequency characteristic, the method has the advantages of being sensitive to the initial corrosion damage of the structure, capable of detecting and incapable of accurately quantifying the corrosion damage degree; however, the technology is still limited to test pieces, and the influence of water on the environment is not taken into account.
Under actual working conditions, part of the engineering structure (the support column of the wharf) is always below the water surface; in the whole service process of the engineering structure, the water level is constantly changed; the EMI technology realizes structural damage identification by measuring admittance signals and judging the deviation of admittance curves; tests show that piezoelectric impedance admittance signals of steel bars in concrete in a rusted state are different from those in a non-rusted state, and the influence of water level can cause the excursion of an admittance curve, so that the accuracy of the EMI technology on the identification of structural damage is influenced; therefore, the interference of water level change on engineering structure damage identification is eliminated, and the establishment of an effective rust damage identification method needs to be solved.
Disclosure of Invention
Aiming at the defects or the improvement requirements of the prior art, the invention provides a method for identifying the concrete corrosion damage by an implanted piezoelectric sensor.
In order to achieve the above object, according to the present invention, there is provided a method for identifying concrete corrosion damage by an implanted piezoelectric sensor, the method comprising the steps of:
s1, packaging the piezoelectric sensor, then putting the piezoelectric sensor into concrete to be identified as aggregate, vibrating the concrete, curing and forming;
s2, exciting voltages are respectively led into the piezoelectric sensors before and after the concrete is in service, the piezoelectric sensors and the concrete to be identified generate resonance, and then admittance signals in the piezoelectric sensors are respectively collected, so that conductivity values before and after the concrete is in service are obtained;
s3, calculating the MAPD damage index by using the conductivity values of the concrete before and after service, thereby realizing the identification of the concrete corrosion damage.
Further preferably, in step S1, the packaging the piezoelectric sensor is performed according to the following steps:
s11, selecting a packaging plate, forming a groove on the packaging plate, placing the piezoelectric sensor in the groove, and sealing a gap between the piezoelectric sensor and the groove by packaging glue;
s12, placing another packaging plate on which the piezoelectric sensor is placed, and sealing the gap between the two packaging plates by packaging glue, so as to realize packaging of the piezoelectric sensor.
Further preferably, the material of the packaging plate is a material which is not easy to oxidize and waterproof.
Further preferably, the packaging adhesive is made of epoxy resin.
Further preferably, the piezoelectric sensor uses piezoelectric ceramics PZT.
Further preferably, the excitation voltage has a voltage of 0.2V to 1V.
Further preferably, the MAPD damage index is calculated according to the following relation:
wherein the content of the first and second substances,
represents the conductance value of the measurement point i before the damage,
and i is the number of the measuring points and N is the total number of the measuring points for the conductance values of the corresponding measuring points after damage.
Generally, compared with the prior art, the technical scheme of the invention has the following beneficial effects:
1. according to the invention, the piezoelectric sensor is embedded into the concrete after being packaged, resonance is generated between the piezoelectric sensor and the concrete after excitation voltage is introduced into the piezoelectric sensor, and admittance signals in the piezoelectric sensor are acquired by utilizing the resonance, so that on one hand, the corrosion degree of the concrete steel bar is detected in real time, on the other hand, the influence of water on PZT is eliminated, and the piezoelectric sensor has good practicability in monitoring the corrosion of the steel bar in the concrete in the environment with constantly changing water level for a long time such as a marine environment;
2. when the piezoelectric sensor is packaged, the adopted materials do not influence the performance of the piezoelectric sensor on one hand, and ensure the isolation of the piezoelectric sensor from the outside on the other hand, so that water in the external environment is prevented from entering;
3. according to the invention, the admittance signal of the sensor is collected, the admittance signal is utilized to construct the MAPD index calculation relational expression, and the MAPD index is utilized to construct a functional relational expression between the MAPD and the corrosion rate so as to reflect the corrosion degree of the steel bar, so that the measurement precision is high, and the method is convenient.
Drawings
FIG. 1 is a schematic diagram of a piezoelectric sensor package constructed in accordance with a preferred embodiment of the present invention;
FIG. 2 is a cross-sectional view of a piezoelectric sensor package constructed in accordance with a preferred embodiment of the present invention;
FIG. 3 is an admittance chart of an aluminum block PZT constructed in accordance with a preferred embodiment of the present invention;
FIG. 4 is an enlarged partial view of the admittance curve of an aluminum block PZT constructed in accordance with a preferred embodiment of the present invention;
FIG. 5 is a schematic diagram of a simplified wiring scheme for corrosion of steel reinforcement constructed in accordance with a preferred embodiment of the present invention;
FIG. 6 is a graph comparing MAPD index and tarnish rate before and after PZT damage to aluminum blocks constructed in accordance with a preferred embodiment of the present invention;
FIG. 7 is a comparison graph of a fitting curve corresponding to MAPD indexes and corrosion rates before and after damage to PZT of an aluminum block;
FIG. 8 is a constructed corrosion rate as a function of MAPD in accordance with a preferred embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
A method for recognizing concrete corrosion damage by an implanted piezoelectric sensor is characterized in that an aluminum block with good waterproofness is used for wrapping PZT (piezoelectric transducer) as an implanted aggregate to monitor corrosion of reinforcing steel bars. The method specifically comprises the following steps:
(1) as shown in fig. 1 and 2, the piezoelectric ceramics PZT is welded by a wire, put into a groove in an aluminum block processed in advance, sealed by epoxy resin in the middle, and then covered by another aluminum block. And then the junction of the upper layer and the lower layer of the aluminum block is sealed by epoxy resin. And when the epoxy resin is dried, the required implanted piezoelectric sensor can be obtained.
(2) And putting the prepared piezoelectric sensor serving as aggregate into concrete, vibrating the concrete, and curing and forming.
(3) Admittance signals before and after rusting were collected with an Agilent 4294A impedance meter.
(4) Acquiring a MAPD damage index according to the admittance value obtained in the step (3);
wherein, mapd (mean Absolute Percentage development) is an Absolute proportional deviation of signals measured by the structure under different states, and the change degree of the PZT (Piezoelectric ceramics) sensor electrical signals before and after the change of the admittance signals can be measured according to the statistical index, and is obtained according to the following formula:
wherein the content of the first and second substances,
represents the conductance value of the measurement point i before the damage,
the conductance values of the corresponding measurement points after damage are obtained. Wherein i is 1, 2, 3, …, n.
The present invention will be further illustrated with reference to specific examples.
In the embodiment, as shown in fig. 5, the test piece is a cubic concrete test piece, the size of the test piece is 150mm × 150mm × 150mm, a 10mm steel bar is inserted into the middle of the test piece, and the test piece is led out to serve as an anode; stainless steel plate is used as cathode. The semi-immersion electrifying corrosion method shown in figure 4 is adopted, and the corrosion of the steel bars is accelerated by the applied current. The degree of corrosion is controlled by controlling the power-on time. Admittance signals at different corrosion rates were collected using an Agilent 4294A impedance meter.
The method for identifying the concrete corrosion damage by adopting the implanted piezoelectric sensor provided by the invention has the advantage that the wiring of the cubic test block is electrified and corroded. As shown in fig. 3 and 4, the admittance graphs and partial enlarged views of the aluminum block PZT are shown.
It can be seen from fig. 4 that the aluminum bulk PZT admittance curve gradually becomes larger with increasing corrosion, showing a gradual leftward trend, especially at the peak of the admittance curve.
From fig. 6 and 7, it can be seen that MAPD shows a gradually increasing trend with increasing corrosion rate, and thus it can be seen that the implanted piezoelectric sensor employed in the present invention is effective in monitoring corrosion. The influence of water on the accurate recognition of the rust by the PZT is eliminated.
From fig. 8, the relationship between MAPD and corrosion rate was calculated as y 0.482293x 2.72704 and the correlation coefficient between the two sets of data was 0.957371563. I.e., the correlation between MAPD and rust rate is large.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (7)
1. A method for identifying concrete corrosion damage by an implanted piezoelectric sensor is characterized by comprising the following steps:
s1, packaging the piezoelectric sensor, then putting the piezoelectric sensor into concrete to be identified as aggregate, vibrating the concrete, curing and forming;
s2, exciting voltages are respectively led into the piezoelectric sensors before and after the concrete is in service, the piezoelectric sensors and the concrete to be identified generate resonance, and then admittance signals in the piezoelectric sensors are respectively collected, so that conductivity values before and after the concrete is in service are obtained;
s3, calculating the MAPD damage index by using the conductivity values of the concrete before and after service, thereby realizing the identification of the concrete corrosion damage.
2. The method for identifying concrete corrosion damage by using an implanted piezoelectric sensor as claimed in claim 1, wherein in step S1, the step of packaging the piezoelectric sensor is performed according to the following steps:
s11, selecting a packaging plate, forming a groove on the packaging plate, placing the piezoelectric sensor in the groove, and sealing a gap between the piezoelectric sensor and the groove by packaging glue;
s12, placing another packaging plate on which the piezoelectric sensor is placed, and sealing the gap between the two packaging plates by packaging glue, so as to realize packaging of the piezoelectric sensor.
3. The method for identifying concrete corrosion damage by using the implantable piezoelectric sensor as claimed in claim 2, wherein the material of the packaging plate is a material which is not easily oxidized and is waterproof.
4. The method for identifying concrete corrosion damage by using an implantable piezoelectric sensor according to claim 2, wherein the encapsulation adhesive is epoxy resin.
5. The method for identifying concrete corrosion damage by using the implantable piezoelectric sensor as claimed in claim 1 or 2, wherein the piezoelectric sensor is made of piezoelectric ceramics PZT.
6. The method for identifying concrete corrosion damage by using the implantable piezoelectric sensor as claimed in claim 1 or 2, wherein the excitation voltage is 0.2V-1V.
7. The method for identifying concrete corrosion damage by the implanted piezoelectric sensor according to claim 1 or 2, wherein the MAPD damage index is calculated according to the following relation:
wherein the content of the first and second substances,
represents the conductance value of the measurement point i before the damage,
and i is the number of the measuring points and N is the total number of the measuring points for the conductance values of the corresponding measuring points after damage.
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| CN202111411932.1A CN114216838A (en) | 2021-11-25 | 2021-11-25 | Method for identifying concrete corrosion damage by implanted piezoelectric sensor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117349601A (en) * | 2023-12-06 | 2024-01-05 | 济南大学 | Concrete damage classification method and system based on piezoelectric vibration waves |
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| CN108896389A (en) * | 2018-07-17 | 2018-11-27 | 北华大学 | A kind of damages of concrete structures monitoring method based on piezoelectric intelligent aggregate |
| CN109596678A (en) * | 2018-11-27 | 2019-04-09 | 中国人民解放军火箭军工程大学 | A kind of the miniature piezoelectric impedance means and method of online health monitoring |
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| CN106226506A (en) * | 2016-08-18 | 2016-12-14 | 长沙理工大学 | The system of detection prestressed reinforced concrete construction corrosive crack and aggregate manufacture method |
| CN108896389A (en) * | 2018-07-17 | 2018-11-27 | 北华大学 | A kind of damages of concrete structures monitoring method based on piezoelectric intelligent aggregate |
| CN109596678A (en) * | 2018-11-27 | 2019-04-09 | 中国人民解放军火箭军工程大学 | A kind of the miniature piezoelectric impedance means and method of online health monitoring |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117349601A (en) * | 2023-12-06 | 2024-01-05 | 济南大学 | Concrete damage classification method and system based on piezoelectric vibration waves |
| CN117349601B (en) * | 2023-12-06 | 2024-03-05 | 济南大学 | Concrete damage classification method and system based on piezoelectric vibration waves |
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