CN107525853A - A kind of intelligent spherical aggregate for concrete structure health monitoring - Google Patents
A kind of intelligent spherical aggregate for concrete structure health monitoring Download PDFInfo
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- CN107525853A CN107525853A CN201610440713.9A CN201610440713A CN107525853A CN 107525853 A CN107525853 A CN 107525853A CN 201610440713 A CN201610440713 A CN 201610440713A CN 107525853 A CN107525853 A CN 107525853A
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- concrete structure
- spherical aggregate
- health monitoring
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- composite material
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/14—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object using acoustic emission techniques
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/22—Details, e.g. general constructional or apparatus details
- G01N29/24—Probes
- G01N29/2437—Piezoelectric probes
- G01N29/245—Ceramic probes, e.g. lead zirconate titanate [PZT] probes
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/023—Solids
- G01N2291/0232—Glass, ceramics, concrete or stone
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/26—Scanned objects
- G01N2291/269—Various geometry objects
- G01N2291/2698—Other discrete objects, e.g. bricks
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- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
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- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
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- Ceramic Engineering (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
Abstract
The invention discloses a kind of intelligent spherical aggregate for concrete structure health monitoring, including hollow ball shape composite material particle, it is formed at the negative electrode of the hollow ball shape composite material particle inner surface and the positive electrode of outer surface, it is packaged in outside the hollow ball shape composite material particle and is provided with the encapsulating structure of electro-magnetic screen layer, and the cable and person's wireless transmitter being connected with the positive electrode, negative electrode, electro-magnetic screen layer；The intelligent spherical aggregate construction stage of concrete in the form of an array in detected concrete structure it is pre-buried, the acoustical signal detected with wired or wireless mode of operation collection intelligent spherical aggregate, and it is sent to teleterminal system, teleterminal system analyzes record in real time to the acoustical signal received, to determine the overall health status of concrete structure.The present invention can be embedded in inside concrete during building structure construction, realize long-term concrete structure health monitoring.
Description
Technical field
The present invention relates to concrete structure field, more particularly to a kind of spherical intelligence for concrete structure health monitoring
Aggregate.
Background technology
At present, the sensor used in concrete structure health monitoring is mostly to need special procedure to install into concrete structure
Internal sensor, this process is often required that when building the structure i.e. while installed into respective sensor, therefore need to be shifted to an earlier date
Planning.Simultaneously because the design of these sensors carries obvious directionality using dish or annular, monitoring range more, generally
Deviateing the region of sensor detection direction certain angle, the monitoring sensitivity of sensor will be decreased obviously, therefore its detection " depending on
It is wild narrow ".
The domestic application for a patent for invention of Application No. 201010607717.4 discloses a kind of reinforced concrete structure building
The sensor of thing acoustical vibration and structural stress variation monitoring, the sensor is by being distributed in building concrete structure or surface
Sensing unit, signal processing unit, signal transmission unit and power supply unit composition, by the way that the data of acquisition are passed through into passive electrical
Cable is sent to monitoring base station, can realize the health monitoring to concrete structure.Structural stress change sensing in the sensor
Device needs to pour in advance along concrete column length direction to be integrated with whole pillar so as to realize using preceding, and in the sensor
Acoustic vibration sensor need to be installed on concrete column surface.This method can to building sound in monitored area, vibration,
The abnormal conditions such as stress variation, crack are monitored and early warning, but above-mentioned the problem of being made troubles to engineering staff be present,
And its Sensor Design for dish, there are problems that " having tunnel vision ", at the same its be arranged on building surface sensor easily by
To the influence of external environment so as to influenceing its monitoring effect.
Furthermore the sensor currently used for health status such as concrete structure crack detections is mostly the pressure based on piezo-electric effect
Electric transducer, but traditional piezoelectric transducer is due to using the pure ceramic material such as PZT as inverting element, its acoustic impedance, bullet
The material parameters such as property modulus and concrete material are far from each other, therefore cause acoustical signal a large amount of at the interface of concrete and sensor
Reflected, reduce sensitivity and the precision of monitoring.
The domestic application for a patent for invention of Application No. 201110226252.2 discloses a kind of flush type for exempting from electromagnetic interference
Concrete structure multifunction piezoelectric actuator intelligent aggregate, the composition of the aggregate include metallic shield base, metallic shield lid, d33 patterns
Piezoelectric ceramic piece, insulation rubber circle, conducting strip, epoxy resin insulating layers, shielded conductor and shielded joint, it can realize that exempting from electromagnetism does
The overall process that inside concrete dynamic damage develops is monitored in the case of disturbing.But because the core parts of the invention are piezoelectric ceramics
That is PZT, the problem of as described above is still suffered from.
Therefore, prior art has yet to be improved and developed.
The content of the invention
In view of above-mentioned the deficiencies in the prior art, it is an object of the invention to provide one kind to be used for concrete structure health monitoring
Intelligent spherical aggregate, its monitoring sensitivity is unrelated with the incident angle of signal, it is no monitoring dead angle；It ensure that intelligent aggregate receives
The high sensitivity and high s/n ratio of signal, and the health monitoring of stable long-term comprehensive concrete structure can be realized.
Technical scheme is as follows：
A kind of intelligent spherical aggregate for concrete structure health monitoring, wherein, including by PZT piezoelectric ceramic particles, cement
The hollow ball shape composite material particle that powder, epoxy resin are combined, it is formed at table in the hollow ball shape composite material particle
The negative electrode in face and the positive electrode of outer surface, it is packaged in outside the hollow ball shape composite material particle and is provided with electromagnetic shielding
The encapsulating structure of layer, and the cable and wireless transmitter being connected with the positive electrode, negative electrode, electro-magnetic screen layer；The ball
Shape intelligent aggregate construction stage of concrete in the form of an array in detected concrete structure it is pre-buried, with wired or wireless work
Pattern collects the acoustical signal that intelligent spherical aggregate detects, and is sent to teleterminal system, and teleterminal system is to receiving
Acoustical signal analyze record in real time, to determine the overall health status of concrete structure.
A kind of described intelligent spherical aggregate for concrete structure health monitoring, wherein, the encapsulating structure includes
Encapsulating material and the electro-magnetic screen layer being arranged at outside encapsulating material, the encapsulating material are mixed by finished ground cement and epoxy resin
Form.
A kind of described intelligent spherical aggregate for concrete structure health monitoring, wherein, the cable be include it is interior
The coaxial cable of core and metal screen layer, the positive electrode are connected to the inner core, and the negative electrode and electro-magnetic screen layer connect
It is connected to the metal screen layer.
A kind of described intelligent spherical aggregate for concrete structure health monitoring, wherein, the wireless transmitter
Including miniature signal receiving and amplifying device, the signal of wireless transmitter, which receives line, to be included：Positive signal line and negative signal line, it is described
Positive signal line is connected to positive electrode, and the negative signal line is connected to negative electrode.
A kind of described intelligent spherical aggregate for concrete structure health monitoring, wherein, the hollow ball shape is compound
The spherical shell being shaped as with inner spherical cavity and a breach of material granule, the encapsulating structure are shaped as complete ball
Shape.
A kind of described intelligent spherical aggregate for concrete structure health monitoring, wherein, the teleterminal system
Including：For carrying out the data acquisition unit of signal acquisition, for entering to the detectable signal of the miniature signal receiving and amplifying device
Row adjusts and is sent to preposition amplification and the filtration module of the data acquisition unit, the main frame being connected with the data acquisition unit；
The main frame is used to analyze the data of collection and obtains the health status of the concrete structure.
Beneficial effect：The present invention can monitor acoustical signal caused by concrete structure to the round-the-clock full visual field, and matched
Teleterminal system can be according to the monitoring signals group transmitted by the magnanimity intelligent aggregate group being collected into comprehensively to monitored mixed
The health status of Xtah Crude Clay structure carries out analysis in real time and record, so as to realize stable long-term comprehensive concrete structure health
Monitoring.
The present invention is applicable in the beginning of building and the stage of ripeness, and is using week available for privately owned building, public building
Health monitoring and safety follow in phase；Because intelligent spherical aggregate is using the work of flush type monitoring pattern, it is ensured that Gao Min
Sensitivity and high s/n ratio, while the magnanimity implanted prosthetics of intelligent aggregate can realize the synchronous progress of a wide range of comprehensive monitoring.Due to
Employ the composite close with concrete material acoustic impedance and modulus of elasticity to be prepared, the intelligent spherical aggregate possesses very
High sensitivity and signal to noise ratio, while it has broader frequency response range compared to conventional piezoelectric sensor, due to using ball
Shape design, monitoring process avoid due to monitoring information caused by " having tunnel vision " it is not comprehensive the problems such as, realize full angle
Detection.Compared with conventional ultrasonic wave monitoring technology, because more comprehensive and information the reliability of obtained information is higher, this is used
Intelligent aggregate more quick can obtain the overall health status evaluation of building structure exactly.
Brief description of the drawings
Fig. 1 is the structure chart of the hollow ball shape composite material particle of the present invention.
Fig. 2 is that the cavity inside of the spherical composite material granular of the present invention can be embedded in the structure chart of wireless transmitter.
Fig. 3 is the structure chart of the electrode position of the hollow ball shape composite material particle of the present invention.
Fig. 4 is the schematic diagram to be worked using wireless transceiving modes of the present invention.
Fig. 5 is the schematic diagram to be worked using wire signal transmission mode of the present invention.
Fig. 6 is the schematic diagram of the concrete structure for being embedded into intelligent spherical aggregate of the present invention.
Embodiment
The present invention provide a kind of intelligent spherical aggregate for concrete structure health monitoring, for make the purpose of the present invention,
Technical scheme and effect are clearer, clear and definite, and the present invention is described in more detail below.It is it should be appreciated that described herein
Specific embodiment only to explain the present invention, is not intended to limit the present invention.
A kind of intelligent spherical aggregate for concrete structure health monitoring, it is included by PZT piezoelectric ceramic particles, cement
The hollow ball shape composite material particle 10 that powder, epoxy resin are combined（As shown in Figure 1）, it is compound to be formed at the hollow ball shape
The negative electrode 13 of the inner surface of material granule 10 and the positive electrode 14 of outer surface（As shown in Figure 3）, it is packaged in the hollow ball shape
Composite material granular 10 is outer and is provided with the encapsulating structure of electro-magnetic screen layer 30（With reference to shown in Fig. 4 and Fig. 5）, and with it is described just
The cable or wireless transmitter 12 that electrode 14, negative electrode 13, electro-magnetic screen layer 30 connect；The intelligent spherical aggregate 1 is mixed
It is pre-buried in detected concrete structure 2 in the form of an array to coagulate the native construction stage（As shown in Figure 6）, with wired or wireless Working mould
Formula collects the acoustical signal that detects of intelligent spherical aggregate 1, and be sent to teleterminal system, and teleterminal system is to receiving
Acoustical signal analyzes record in real time, to determine the overall health status of concrete structure 2.
The intelligent spherical aggregate 1 of the present invention will not give work by way of being embedded to together with coarse aggregate in concrete structure 2
Cheng personnel make troubles, influenceed by external environment it is small, simultaneously because its spherical shape also solves " having tunnel vision " well
Problem.Further, the intelligent spherical aggregate possesses the acoustic impedance close with concrete material and modulus of elasticity parameter, therefore
Possess very high sensitivity and signal to noise ratio, while its frequency response range is also widened significantly compared to conventional piezoelectric sensor.
The manufacturing process of intelligent spherical aggregate is as follows：
First, hollow ball shape composite material particle 10, as shown in Figure 1.Hollow ball shape composite material particle by particle diameter distribution in
The PZT piezoelectric ceramic particles and particle diameter distribution of 40-110 micrometer ranges be in the Portland cement powder of 4-40 micrometer ranges
Raw material are combined（Also it is added with epoxy resin）.Hollow ball shape composite material can be ensured using such particle diameter distribution
The density of grain 10, reach the effect of maximum accumulation, to improve the piezoelectric property of composite.The hollow ball shape composite material
Particle 10 is shaped as the spherical shell with inner spherical cavity and a breach 11, and wireless transmitter 12 can pass through the breach 11
It is fixed on inside hollow ball shape composite material particle 10.By positive electrode 14 and wireless transmitter 12（As shown in Figure 2）Positive pole
It is connected, negative electrode 13 is connected with negative pole.The wireless transmitter 12 includes miniature signal receiving and amplifying device, wireless receiving and dispatching dress
Putting 12 signal reception line includes：Positive signal line and negative signal line, the positive signal line are connected to positive electrode 14, the negative signal
Line is connected to negative electrode 13.
Then, PZT piezoelectric ceramic particles and finished ground cement should in mass ratio 4:1 carries out ball milling mixing, after being well mixed again
Pure water is added by 0.35 ratio of mud to stir into mixture, then slurry is poured into hollow die for molding, sample
Thickness is 3 millimeters, and external diameter is 15 millimeters.It is positioned under conditions of 65 DEG C of temperature and relative humidity 98% and conserves 14 days after vacuumizing.
After curing period, form removal tool takes sample.Silver paste is uniformly coated with the surfaces externally and internally of composite, forms a thin layer of positive electrode
14（Outside）And negative electrode 13（It is interior）, as shown in Figure 3.Manufacturing process will ensure the inside and outside of silver paste and cement base piezoelectric composite material
Surface contact is close, while avoids because unsuitable electrode installation operation causes both positive and negative polarity short-circuit.
After the completion of electrode fabrication, piezo-electricity composite material ball is put into drying box, 105 DEG C of high temperature dryings 24 hours are to eliminate
Free water, prevent because the presence of Free water causes in polarization process sample by high electrical breakdown.After the completion of drying, put it into
Polarized in 80 DEG C of silicone oil bath, apply the 4000V/mm of 30 minutes direct current in the positive electrode and negative electricity interpolar of composite
Voltage.After the completion of polarization, piezo-electricity composite material is put into rapidly in 20 DEG C of silicone oil and quickly cooled down, to keep its good piezoelectricity
Performance.After 20 minutes, composite is taken out from silicone oil, is covered after being dried with blotting paper by tinfoil, to eliminate surface accumulation
Electrostatic charge.Push tinfoil after 24 hours aside, cement base piezoelectric sensor production is completed.
The encapsulating structure includes encapsulating material 20 and the electro-magnetic screen layer 30 being arranged at outside encapsulating material 20, the envelope
Package material 20 is by cement and epoxy resin in mass ratio 1.5:1 is uniformly mixed.Due to the presence of no water, cement does not have
Aquation, its object is to adjust the acoustic impedance of resin, it is set to be approached with concrete.Whole encapsulation process needs under vacuum
Carry out, to reduce the quantity of bubble, obtain good packaging effect.The external diameter of sensor is 20 millimeters after final encapsulation, encapsulation
The solidification of structure needs 24 hours.Silver paste can be applied after solidification on its surface, and shielding protection is carried out to intelligent aggregate.
The schematic diagram to be worked using wireless transceiving modes of the present invention, as shown in figure 4, wireless transceiving modes system is mainly wrapped
Include：Hollow sphere cement base piezoelectric composite material sensor（Hollow ball shape composite material particle 10 is formed）, encapsulating material 20, nothing
Line R-T unit 12 and the part of the grade of electro-magnetic screen layer 30 four.Specific embodiment is as follows：
Hollow sphere cement base piezoelectric composite material sensor is the core of this structure, by PZT piezoelectric ceramic particles and general
Logical portland cement powder is combined, and not only with excellent mechanics, electric property, while has and concrete identical sound
Impedance, acoustical signal successfully can be passed to cement base piezoelectric sensor by concrete structure, substantially increase the sensitivity of detection
With accuracy., it is necessary to be polarized to the internal and external electrode of sensor before wireless transmitter 12 is placed, to obtain well
Piezoelectric property, dispatch from foreign news agency extremely positive pole after polarization, interior electrode are negative pole.
After sensor and wireless transmitter 12 is connected, put it into vacuum in spherical die and pour into cement resin
Base encapsulating material, become one it is complete spherical.A diameter of 20 millimeters of intelligent spherical aggregate, with common coarse aggregate diameter
Quite.After waiting encapsulating material solidification in 24 hours, apply silver paste and make screen layer.So, a complete intelligent wireless aggregate is just made
Complete.
The schematic diagram of the intelligent spherical aggregate using the work of wired transceiver mode of the present invention is as shown in Figure 5.Wired transmitting-receiving
Pattern work system mainly includes：Hollow sphere cement base piezoelectric composite material sensor, encapsulating material 20, coaxial cable 40 with
And the part of the grade of electro-magnetic screen layer 30 four.Specific embodiment is as follows：
Hollow sphere cement base piezoelectric composite material sensor is the core of this structure, by PZT piezoelectric ceramic particles and water
Mud powder is combined., it is necessary to be polarized to the internal and external electrode of sensor before connecting coaxial cable, to obtain well
Piezoelectric property, dispatch from foreign news agency extremely positive pole after polarization, interior electrode are negative pole.
The hollow ball shape composite material particle 10 is shaped as the spherical shell with inner spherical cavity and a breach, coaxially
Cable can be fixed on sensor internal by the breach.The positive electrode of sensor is connected with the positive pole of coaxial cable, negative electricity
Pole is connected with negative pole, while reserves a wire being connected with negative pole, is connected after the completion of to be packaged with screen layer, optimal to obtain
Shield effectiveness.
After sensor and coaxial cable 40 is connected, put it into vacuum in spherical die and pour into cement resin base envelope
Package material, become one it is complete spherical.A diameter of 20 millimeters of intelligent aggregate are suitable with common coarse aggregate diameter.Deng
After 24 hours encapsulating materials solidify, apply silver paste and make screen layer, and be connected with coaxial cable negative pole, obtain optimal shielding effect
Fruit.So, a complete wire transmission intelligent aggregate just completes.
As shown in fig. 6, by the embedded concrete structure 2 of intelligent spherical aggregate 1, and it is connected with external signal processing equipment
Connect.The electric signal that sensor collects is transferred to receiving terminal by way of wirelessly or non-wirelessly.Remote monitoring terminal can foundation
The monitoring signals group transmitted by magnanimity intelligent aggregate group received carries out comprehensive to the health status for being monitored concrete structure
Analysis in real time and record, so as to realize stable long-term comprehensive concrete structure health monitoring.
Because the intelligent spherical aggregate has special spherical designs, can be realized after being embedded in concrete " complete
The visual field " detects, i.e., monitoring sensitivity is unrelated with the incident angle of signal, no monitoring dead angle.The intelligent spherical aggregate has in itself
Close acoustic impedance and modulus of elasticity with concrete material, therefore, because signal energy loss quilt caused by interface reflection etc.
It is minimized, ensure that the high sensitivity and high s/n ratio of intelligent spherical aggregate reception signal, simultaneously because the spherical intelligent bone
Material is mainly prepared by cement-based material, ensure that intelligent spherical aggregate has the durability similar to concrete material itself, with
Realize the health monitoring of stable long-term comprehensive concrete structure.
It should be appreciated that the application of the present invention is not limited to above-mentioned citing, for those of ordinary skills, can
To be improved or converted according to the above description, all these modifications and variations should all belong to the guarantor of appended claims of the present invention
Protect scope.
Claims (6)
1. a kind of intelligent spherical aggregate for concrete structure health monitoring, it is characterised in that including by PZT piezoelectric ceramics
The hollow ball shape composite material particle that grain, finished ground cement, epoxy resin are combined, is formed at the hollow ball shape composite material
The negative electrode on intragranular surface and the positive electrode of outer surface, it is packaged in outside the hollow ball shape composite material particle and is provided with electricity
The encapsulating structure of magnetic masking layer, and cable and the wireless receiving and dispatching dress being connected with the positive electrode, negative electrode, electro-magnetic screen layer
Put；The intelligent spherical aggregate construction stage of concrete in the form of an array in detected concrete structure it is pre-buried, with wired or
Wireless mode of operation collects the acoustical signal that intelligent spherical aggregate detects, and is sent to teleterminal system, teleterminal system
Record is analyzed in real time to the acoustical signal received, to determine the overall health status of concrete structure.
A kind of 2. intelligent spherical aggregate for concrete structure health monitoring according to claim 1, it is characterised in that
The encapsulating structure includes encapsulating material and the electro-magnetic screen layer being arranged at outside encapsulating material, and the encapsulating material is by cement flour
End and epoxy resin mix.
A kind of 3. intelligent spherical aggregate for concrete structure health monitoring according to claim 1, it is characterised in that
The cable is the coaxial cable for including inner core and metal screen layer, and the positive electrode is connected to the inner core, the negative electrode
And electro-magnetic screen layer is connected to the metal screen layer.
A kind of 4. intelligent spherical aggregate for concrete structure health monitoring according to claim 1, it is characterised in that
The wireless transmitter includes miniature signal receiving and amplifying device, and the signal of wireless transmitter, which receives line, to be included：Positive signal
Line and negative signal line, the positive signal line are connected to positive electrode, and the negative signal line is connected to negative electrode.
A kind of 5. intelligent spherical aggregate for concrete structure health monitoring according to claim 1, it is characterised in that
The spherical shell being shaped as with inner spherical cavity and a breach of the hollow ball shape composite material particle, the encapsulating structure
Be shaped as complete spherical.
A kind of 6. intelligent spherical aggregate for concrete structure health monitoring according to claim 4, it is characterised in that
The teleterminal system includes：For carrying out the data acquisition unit of signal acquisition, for receiving amplification to the miniature signal
The detectable signal of device is adjusted and is sent to preposition amplification and the filtration module of the data acquisition unit, is adopted with the data
The connected main frame of storage；The main frame is used to analyze the data of collection and obtains the healthy shape of the concrete structure
Condition.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610440713.9A CN107525853A (en) | 2016-06-20 | 2016-06-20 | A kind of intelligent spherical aggregate for concrete structure health monitoring |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610440713.9A CN107525853A (en) | 2016-06-20 | 2016-06-20 | A kind of intelligent spherical aggregate for concrete structure health monitoring |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109001441A (en) * | 2018-05-07 | 2018-12-14 | 昆明理工大学 | A kind of road structure monitoring method based on intelligent aggregate |
| CN113552220A (en) * | 2021-08-13 | 2021-10-26 | 同济大学 | Reinforced concrete structure health monitoring system |
-
2016
- 2016-06-20 CN CN201610440713.9A patent/CN107525853A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109001441A (en) * | 2018-05-07 | 2018-12-14 | 昆明理工大学 | A kind of road structure monitoring method based on intelligent aggregate |
| CN109001441B (en) * | 2018-05-07 | 2021-04-09 | 昆明理工大学 | Road structure monitoring method based on intelligent aggregate |
| CN113552220A (en) * | 2021-08-13 | 2021-10-26 | 同济大学 | Reinforced concrete structure health monitoring system |
| CN113552220B (en) * | 2021-08-13 | 2022-09-13 | 同济大学 | Reinforced concrete structure health monitoring system |
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Application publication date: 20171229 |