CN202710517U - Ultrasound monitoring sensor for corrosion of reinforcement in concrete - Google Patents
Ultrasound monitoring sensor for corrosion of reinforcement in concrete Download PDFInfo
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- CN202710517U CN202710517U CN 201220388385 CN201220388385U CN202710517U CN 202710517 U CN202710517 U CN 202710517U CN 201220388385 CN201220388385 CN 201220388385 CN 201220388385 U CN201220388385 U CN 201220388385U CN 202710517 U CN202710517 U CN 202710517U
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Abstract
The utility model relates to an ultrasound monitoring sensor for corrosion of reinforcement in concrete. The ultrasound monitoring sensor is characterized by comprising a reinforcing steel bar (1), wherein one end of the reinforcing steel bar (1) is provided with a piezoelectric ceramic column (2) for transmitting ultrasound waves, and the other end of the reinforcing steel bar (1) is provided with another piezoelectric ceramic column (3) for receiving the ultrasound waves. The axial direction of the piezoelectric ceramic column (2) and the piezoelectric ceramic column (3) is the same as that of the reinforcing steel bar. The transmitting piezoelectric ceramic column (2) and the receiving piezoelectric ceramic column (3) are respectively provided with a transmitting shield leading wire (4) and a receiving shield leading wire (5). A resin insulation layer (6) and a shield layer (7) are respectively arranged outside the transmitting piezoelectric ceramic column (2) and the receiving piezoelectric ceramic column (3). When the ultrasound monitoring sensor is used, the sensor is buried in the concrete in construction, and the transmitting shield leading wire (4) is connected with a signal generator (8) to generate the ultrasound waves, an the receiving shield leading wire (5) is connected with a signal receiver (9) to receive the ultrasound waves. The sensor monitors the corrosion state of the reinforcement in the concrete (10) according to change of received ultrasound waves.
Description
Technical field
The utility model relates to monitoring device and the monitoring method of Rust of Rebar in Concrete, specifically a kind of Rust of Rebar in Concrete ultrasonic monitoring sensor.
Background technology
A large amount of engineering practices show that in reinforced concrete structure, steel bar corrosion is the principal element that affects the existing structure permanance.The corrosion meeting of reinforcing bar causes the steel bar stress area of section to reduce; cohesion between reinforcing bar and the concrete descends; crack; structural strength reduction etc.; thereby structure durability is reduced; the drag of structure decays in time, and fiduciary level also correspondingly reduces, so that xoncrete structure exists great hidden danger at usability and security.Along with the development of Chinese society economy, various large complicated engineering structures continue to bring out, and the civil engineering works structure health monitoring technology becomes the study hotspot of academia gradually.In recent ten years, the successful Application of intellectual material structure in engineering field provides effective approach for realizing monitoring structural health conditions truly.Monitoring steel bar corrosion method at present commonly used has electrochemical process, fiber-optic monitoring, acoustic emission monitor(ing) and ultrasonic monitoring etc.Electrochemical method is corrosion degree or the speed of determining reinforcing bar by the electrochemical properties of measuring the steel reinforced concrete erosion system, mainly contains half-cell prtential method, linear polarization method, coulostatic method, electrochemistry noise method, AC impedence method etc.Fibre Optical Sensor is a kind of novel sensor that closely develops rapidly during the last ten years.Basic sensing principle is when light wave transmits in optical fiber, the characteristic parameter (amplitude, phase place, polarization state, wavelength etc.) that characterizes light wave can be owing to measured (such as strain, displacement, temperature, pressure, acceleration, electric field etc.) effect to optical fiber changes, thereby the intensity, interference effect, the plane of polarization that cause light wave change, make light wave become modulated signal, again through realizing the monitoring to buildings behind photo-detector and the (FBG) demodulator.Acoustic emission and supercritical ultrasonics technology are arranged in addition.Acoustic emission is also referred to as the stress wave emission, as a kind of Dynamic Non-Destruction Measurement commonly used the history in more than 30 year has been arranged.Structure can give off energy in loading process, some corrosion courses such as stress corrosion crack, cavitation damage etc. all are accompanied by the release of acoustic energy, transducer can convert the acoustical signal that receives to electric signal analysis, by monitoring with record generation and the state of development that this sound wave just can obtain defective and corrosion damage in the structure, and determine their position.Acoustic-emission need to carry out continuous monitoring, is subject to environmental noise and disturbs.Ultrasonic method is a kind of active monitoring method, utilize the ultrasonic probe emission and receive ultrasound wave, reinforcing bar position concrete is scanned, although detect simple and convenient, but monitoring reinforcement corrosion degree of accuracy is not high, and is accurate not for the result who does not occur to detect when obviously the rust spalling is stitched.Above-mentioned monitoring method has its advantage, and its limitation is also arranged.
Summary of the invention
The purpose of this utility model provides a kind of steel bar corrosion ultrasonic monitoring sensor in the Transducers Embedded in Concrete of being suitable for that makes things convenient for monitoring steel bar corrosion simple in structure.Realize that the technical scheme that the purpose of this utility model is taked is: this Rust of Rebar in Concrete ultrasonic monitoring sensor is provided with a reinforcing bar, one end of reinforcing bar is provided with emission piezoelectric ceramics post, be used for the emission ultrasound wave, the other end of reinforcing bar is provided with to receive uses the piezoelectric ceramics post, be used for receiving ultrasound wave, and the axial direction of piezoelectric ceramics post and piezoelectric ceramics post is consistent with the axial direction of reinforcing bar, emission is used shielded lead with piezoelectric ceramics post and reception with being respectively equipped with emission on the piezoelectric ceramics post with shielded lead and receiving, said emission is respectively equipped with resin insulating barrier with piezoelectric ceramics post and the outside that receives with the piezoelectric ceramics post, and resin insulating barrier is provided with screen layer outward.In recent years, piezoelectric ceramics becomes one of intellectual material of civil engineering field broad research and application with its distinctive sensing and driving function.Because the advantages such as it has fast response time, linear relationship is good, Hz-KHz is wide, energy consumption is low, easily cut out, cheap and easy machine-shaping are existing huge application potential aspect the engineering structure health monitoring.Therefore, piezoelectric is as primary element, convenient and practical.The using method of this sensor is: in the concrete when this sensor is imbedded building.During monitoring, the piezoelectric ceramics post of an end connects signal generator and produces ultrasound wave, and the piezoelectric ceramics post of the other end connects signal receiver, receives ultrasound wave.The corrosion situation of variation monitoring reinforcing bar in concrete according to received ultrasonic signal.In this method, ultrasound wave is propagated in reinforcing bar, subwave will be arranged in refraction and the transmission of reinforcing bar and concrete interface location generation ripple.Reinforcing bar and concrete will form an interface, because reinforcing bar is different from the concrete material performance, ripple will be launched and transmission on the interface.After reinforcing bar generation corrosion, the surface of reinforcing bar will produce corrosion product steel bar corrosion product can volumetric expansion, and acoustic wave transmission enters concrete will the minimizing by will the increasing of reinforcing bar like this, and along with the intensification of extent of corrosion, the sound wave by reinforcing bar will strengthen.When corrosion to a certain degree the time, the tension of the reinforcing bar surrounding concrete tension that oversteps the extreme limit, the concrete around the reinforcing bar begins to occur micro-cracks, in case the crack occurs, is transmitted into concrete sound wave by reinforcing bar and will reduces to minimum.The hyperacoustic amplitude that receives is also with maximum.
The utility model utilizes reinforcing bar as the medium of ultrasonic propagation, has overcome common ultrasonic monitoring method with the limitation of concrete as propagation medium.In work progress, in the sensor Transducers Embedded in Concrete, on-line monitoring that can be real-time, long-term to steel bar corrosion.The advantage of this method maximum is that the corrosion degree that can monitor reinforcing bar can monitor concrete damage again, can characterize the interaction between reinforcing bar, corrosion product and the concrete three.
Description of drawings
Fig. 1 is structural representation of the present utility model;
Connection diagram when Fig. 2 is the utility model monitoring.
Fig. 3 is the oscillogram of the utility model in experiment;
Fig. 4 be the utility model bright in experiment ultrasound wave amplitude and the graph of relation of time.
Among the figure, 1, reinforcing bar, 2 emission piezoelectric ceramics posts, 3, receive and use the piezoelectric ceramics post, 4, launch and use shielded lead, 5, receive and to use shielded lead, 6, resin insulating barrier, 7, screen layer, 8, signal generator, 9, signal receiver 9,10, concrete, 11, receive ripple, 12, transmitted wave.
Embodiment
With reference to accompanying drawing, this Rust of Rebar in Concrete ultrasonic monitoring sensor senses device, be provided with a reinforcing bar 1, one end of reinforcing bar 1 is provided with emission piezoelectric ceramics post 2, be used for the emission ultrasound wave, the other end of reinforcing bar 1 is provided with and receives with piezoelectric ceramics post 3, be used for receiving ultrasound wave, and the axial direction of piezoelectric ceramics post 2 and piezoelectric ceramics post 3 is consistent with the axial direction of reinforcing bar, emission is used shielded lead 5 with piezoelectric ceramics post 2 and reception with being respectively equipped with emission on the piezoelectric ceramics post 3 with shielded lead 4 and receiving, said emission is respectively equipped with resin insulating barrier 6 with piezoelectric ceramics post 2 and the outside that receives with piezoelectric ceramics post 3, the resin insulating barrier 6 outer screen layers 7 that are provided with.Said screen layer 7 is to apply the silver slurry.Said reinforcing bar 1 diameter is: 10～20mm, length is: 100～200mm.Among the present invention, it is crucial making the suitable piezoelectric ceramics post of piezoelectric sensor selection.At present, mainly be the lead zirconate titanate of binary system at the most widely used piezoceramic material of engineering field, be called for short PZT.Mainly contain three types: PZT-4, PZT-5 and PZT-8.Wherein, PZT-8 is high-power emission type piezoelectric ceramics, is mainly used in Ultrasonic Cleaning, supersonic face care, ultrasonic operation cutter, ultrasonic tooth, ultrasonic soldering etc.PZT-5 is high sensitivity reception type piezoelectric ceramics, is mainly used in electro-acoustic element, accelerometer, pressure gauge, flowmeter and wind gage water, acoustic transducer, sensor.PZT-4 is middle power emission, receives the dual-purpose type piezoelectric ceramics, is mainly used in transmitting and receiving the transducer of double-purpose functional.Emission is adopted PZT-4 or PZT-5 piezoelectric ceramics post with piezoelectric ceramics post 2 and reception with piezoelectric ceramics post 3 among the present invention.Piezoelectric ceramics post 2 is consistent with length direction with the polarised direction that receives with piezoelectric ceramics post 3.
The using method of this Rust of Rebar in Concrete ultrasonic monitoring sensor is: in the concrete when Rust of Rebar in Concrete ultrasonic monitoring sensor is imbedded building.During monitoring, emission utilizes emission to connect signal generator 8 with shielded lead 4 with piezoelectric ceramics post 2, produce ultrasound wave, the reception of the other end utilizes to receive with piezoelectric ceramics post 3 and connects signal receiver 9 with shielded lead 5, receive ultrasound wave,, according to the corrosion situation of variation monitoring reinforcing bar in concrete 10 of received ultrasonic signal.
The below is illustrated principle of work of the present utility model with the embodiment of testing laboratory.
This test is for accelerating experiment, and the logical direct current of reinforcing bar is to accelerate corrosion.The signal that to the effect that utilizes piezoceramic transducer monitoring Corrosion Reinforcement of this experimental study is trend over time, inquires into piezoelectric element for the validity of Corrosion Monitoring of Rebar.Test design is as follows: at first, place concrete to make module sensor of the present invention, the module for preparing is put into the container that fills 5%NaCl solution, and the wire of connecting reinforcement is linked to each other with the positive pole of direct supply, and the negative pole of direct supply is connected with the copper rod of putting into solution.Then, the emission sensor that sticks on the reinforcing bar section is linked to each other with a passage of signal generator, receiving sensor links to each other with an oscillographic passage, and another passage and oscillographic another passage of signal generator joined, in order to from oscillograph, can clearly see the ultrasound wave waveform that sensor sends.The frequency of adjusting signal generator makes in its resonant frequency range that is in the transmitting piezoelectric ceramic sensor (this tests used frequency is 100kHz), and the amplitude of emitting voltage is transferred to maximum, call rectangular wave on the signal generator, the waveform that receives guarantees simultaneously oscillographic two Channel Synchronous, until can be shown on the oscillograph clearly.The voltage of the direct supply of accelerated corrosion test transfers to 2V, and resistance is 100 Ω, just begins after the energising to measure.Pressure is smaller because institute switch on, and the corrosion process is slower, so when measurement got a secondary data every 3 hours, when fetching data, liquid level is taken out in test block, makes data inaccurate to avoid the ultrasound wave amplitude to decay in solution.Until test block surface when obvious crack occurring, just stops to measure.The waveform that obtains in the experiment as shown in Figure 3, the solid line among the figure is for receiving ripple, dotted line is transmitted wave.By oscillogram as can be known, the ultrasound wave amplitude begins to measure just from energising and increases gradually, and approximately behind the 120h, amplitude changes very little, begins to tend towards stability.This is because the mortar specimen before the energising, the bonding of reinforcing bar and sand-cement slurry is tightr, during the interface of the ultrasound wave that the piezoelectric sensor at two ends sends by reinforcing bar and mortar, understand some signal and be transmitted in the mortar, so that hyperacoustic amplitude ratio decreases before imbedding.In the test, continuous corrosion along with reinforcing bar after the energising, corrosion product does not stop to occur and begins to expand, generate loose corrosion layer at reinforcing bar and concrete interface, the cohesiveness of reinforcing bar and mortar decreases, and the interface begins gradually to move towards the state that breaks away from, at this moment, ultrasonic signal is transmitted to mortar when propagating between reinforcing bar and mortar interface number of signals reduces gradually, so the autoacceleration corrosion begins, the ultrasound wave amplitude begins to raise gradually.So that reinforcing bar and sand-cement slurry break away from fully, ultrasonic signal is only propagated along reinforcing bar self, no longer is transmitted in the mortar when the generation of corrosion product.So after the 120h, the ultrasound wave amplitude fluctuates between a certain numerical value, tends towards stability gradually.Interpretation is as such as Fig. 4.
Claims (4)
1. Rust of Rebar in Concrete ultrasonic monitoring sensor, it is characterized in that: this sensor is provided with reinforcing bar (1), one end of reinforcing bar (1) is provided with emission piezoelectric ceramics post (2), be used for the emission ultrasound wave, the other end of reinforcing bar (1) is provided with and receives with piezoelectric ceramics post (3), be used for receiving ultrasound wave, and piezoelectric ceramics post (2) is consistent with the axial direction of reinforcing bar with the axial direction of piezoelectric ceramics post (3), launch with piezoelectric ceramics post (2) and receive with being respectively equipped with emission on the piezoelectric ceramics post (3) with shielded lead (4) and receiving and use shielded lead (5), said emission is respectively equipped with resin insulating barrier (6) with piezoelectric ceramics post (2) and the outside that receives with piezoelectric ceramics post (3), and resin insulating barrier (6) is provided with screen layer (7) outward.
2. according to the said Rust of Rebar in Concrete ultrasonic monitoring of claim 1 sensor, it is characterized in that: said screen layer (7) is to apply the silver slurry.
3. according to the said Rust of Rebar in Concrete ultrasonic monitoring of claim 1 sensor, it is characterized in that: said reinforcing bar (1) diameter is: 10～20mm, length is: 100～200mm.
4. according to the said Rust of Rebar in Concrete ultrasonic monitoring of claim 1 sensor, it is characterized in that: said emission is adopted PZT-4 or PZT-5 piezoelectric ceramics post with piezoelectric ceramics post (2) and reception with piezoelectric ceramics post (3).
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201220388385 CN202710517U (en) | 2012-08-07 | 2012-08-07 | Ultrasound monitoring sensor for corrosion of reinforcement in concrete |
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| CN 201220388385 CN202710517U (en) | 2012-08-07 | 2012-08-07 | Ultrasound monitoring sensor for corrosion of reinforcement in concrete |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103388378A (en) * | 2013-07-31 | 2013-11-13 | 上海交通大学 | Intelligent reinforcing steel bar based on piezoelectric ceramic crystal and fabrication method thereof |
| CN103575805A (en) * | 2012-08-07 | 2014-02-12 | 济南大学 | Ultrasonic monitoring sensor for corrosion of steel bar in concrete and application method of sensor |
| CN103575769A (en) * | 2013-11-13 | 2014-02-12 | 济南大学 | Piezoelectric sensor for steel-bar corrosion monitoring and steel-bar corrosion monitoring method |
| CN104406901B (en) * | 2014-11-07 | 2017-02-01 | 北京奥科瑞检测技术开发有限公司 | Concrete internal steel bar corrosion monitoring sensor based on Lamb wave principle |
| CN109030629A (en) * | 2018-07-13 | 2018-12-18 | 长江大学 | A kind of steel and concrete structure bonding quality evaluating apparatus and method based on PZT |
-
2012
- 2012-08-07 CN CN 201220388385 patent/CN202710517U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103575805A (en) * | 2012-08-07 | 2014-02-12 | 济南大学 | Ultrasonic monitoring sensor for corrosion of steel bar in concrete and application method of sensor |
| CN103388378A (en) * | 2013-07-31 | 2013-11-13 | 上海交通大学 | Intelligent reinforcing steel bar based on piezoelectric ceramic crystal and fabrication method thereof |
| CN103388378B (en) * | 2013-07-31 | 2016-03-02 | 上海交通大学 | Based on the intelligent reinforcing bar and preparation method thereof of piezoceramics crystal |
| CN103575769A (en) * | 2013-11-13 | 2014-02-12 | 济南大学 | Piezoelectric sensor for steel-bar corrosion monitoring and steel-bar corrosion monitoring method |
| CN104406901B (en) * | 2014-11-07 | 2017-02-01 | 北京奥科瑞检测技术开发有限公司 | Concrete internal steel bar corrosion monitoring sensor based on Lamb wave principle |
| CN109030629A (en) * | 2018-07-13 | 2018-12-18 | 长江大学 | A kind of steel and concrete structure bonding quality evaluating apparatus and method based on PZT |
| CN109030629B (en) * | 2018-07-13 | 2021-05-25 | 长江大学 | PZT-based reinforced concrete structure cementation quality evaluation device and method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130130 Termination date: 20130807 |