CN102495135A - Pressure measurement and crack detection sensor based on nano carbon black and piezoelectric ceramic composite cement - Google Patents
Pressure measurement and crack detection sensor based on nano carbon black and piezoelectric ceramic composite cement Download PDFInfo
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- CN102495135A CN102495135A CN2011104136435A CN201110413643A CN102495135A CN 102495135 A CN102495135 A CN 102495135A CN 2011104136435 A CN2011104136435 A CN 2011104136435A CN 201110413643 A CN201110413643 A CN 201110413643A CN 102495135 A CN102495135 A CN 102495135A
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Abstract
The invention relates to a sensor based on nano carbon black and piezoelectric ceramic composite cement, which is good in compatibility with concrete, capable of accurately locating crack positions and measuring pressure changes and high in strength and sensitivity. Concrete and carbon black are evenly mixed and made into cubic blocks according to the proportion of 5 to 1, two pieces of copper meshes are additionally arranged in each concrete cubic block, and three piezoelectric ceramic pieces are also implanted in, and each piezoelectric ceramic piece is respectively connected with a wire. By utilizing the pressure-sensitive characteristic of nano carbon black to measure pressure and by utilizing the piezoelectric ceramic pieces to locate mechanical damage, the sensor based on the nano carbon black and piezoelectric ceramic composite cement is capable of simultaneously achieving pressure measurement and crack detection and location, and can be widely used in the engineering monitoring field.
Description
Technical field
The present invention relates to sensor field, particularly a kind of good with the concrete compatibility, can accurately locate crack location, measure the highly sensitive nanometer carbon black piezoelectric ceramics of the high strength complex cement based sensor that pressure changes simultaneously.
Background technology
At present, used sensing element in the field of civil engineering all is the material that had used comparative maturity at other field generally, like light transmitting fiber, and piezoelectric ceramics, memory metal alloy etc.Most important structured material in these materials and the field of civil engineering, concrete often exists tangible consistency problem; Can be that intellectual material produces spurious signal like this, influence sensing accuracy, even the judgement that can lead to errors; Normal use is structurally caused very big infringement, and for example, fiber-optic grating sensor commonly used in the engineering exists precision low; Be subject to extraneous stress temperature effect; There are unmatched problem in encapsulating material and version and matrix, cause under the high frequency strain, and fiber-optic grating sensor can not effectively be followed the tracks of the strain variation of matrix.The present invention uses with cement based and is carrier, and the sensor of built-in piezoelectric ceramic piece and nanoscale carbon black has the precision height, and the characteristics that compatibility is good can effectively solve this engineering problem.The sensor that utilizes piezoceramic transducer to carry out the location, crack and utilize the carbon black pressure-sensitive character to carry out pressure measurement all exists; But both are not effectively combined; The present invention has effectively combined both characteristics, is can detect a flaw the simultaneously location and the cement based sensor of engineering dynamometry.
Summary of the invention
The present invention has overcome the tangible consistency problem of existing sensors and concrete existence, and causes the deficiency of the generation of spurious signal and the reduction of sensing accuracy etc.It is a kind of good with the concrete compatibility to the invention provides, and can accurately locate crack location, measures the highly sensitive nanometer carbon black piezoelectric ceramics of the high strength complex cement based sensor that pressure changes simultaneously.Not only accurate location can be damaged, and inner stressing conditions can be analyzed simultaneously.
The technical solution adopted for the present invention to solve the technical problems is:
This sensor comprises four parts: cement matrix, piezoelectric ceramic piece, wire netting and lead; Cement matrix is cement and nano-level conducting carbon black in the even mixed cement that the makes cube block of 5: 1 ratio; Three piezoelectric ceramic piece implantation cement cube blocks are interior and not in same plane, each piezoelectric ceramic piece links to each other with lead respectively; Two wire nettings are set in cement cube block, change the signal that produces owing to pressure through wire netting output carbon granule.
With the cement based is carrier, and piezoelectric ceramic piece and carbon granule are applied in the middle of the sensor simultaneously, utilizes that two kinds of materials are collaborative accomplishes the structural behaviour monitoring.Utilize the ultimate principle of piezoelectric ceramic piece (PZT) wave propagation method to carry out xoncrete structure damage, the meticulous identification in defective crack; Utilize the voltage-dependent characteristic of nano carbon black, judge the structure pressure.Piezoelectric can be realized sensing function according to direct piezo electric effect, can realize driving function according to inverse piezoelectric effect.After in concrete, adding an amount of nanometer carbon black, mechanical property and electric property all increase, the also corresponding increase of concrete bending and compressive strength.
The present invention's outstanding effect compared with present technology is:
One of which: good with the concrete compatibility, the present invention be by with the good cement base piezoelectric composite material of concrete compatibility be sensing unit, form through cement block parcel.The most frequently used concrete material has good compatibility in this sensor and the civil engineering work, like similar acoustic impedance, the shrinkage factor that is equal to and close coefficient of thermal expansion etc.; It is embedded in the concrete, and does not have discontinuous interface problem between the surrounding concrete, promptly can not change the characteristic of structure, also the stress mutation phenomenon can not occur.
Its two: intensity is high, good endurance, the nano carbon black material has good electric conductivity, small-sized, specific surface area is big, interface performance is excellent, existing researchist is applied in it in concrete, improves concrete material micromechanism and mechanical property.
Its three: perceptual sensitivity is high, has fully combined the advantage of piezoelectric ceramic piece and nano carbon black, can damage accurate location, utilizes the pressure-sensitive character of material to analyze inner stressing conditions simultaneously.
Its four: can damage accurate location simultaneously and analyze inner stressing conditions.Utilize the ultimate principle of piezoelectric ceramic piece (PZT) wave propagation method to carry out xoncrete structure damage, the meticulous identification in defective crack; Utilize the voltage-dependent characteristic of nano carbon black, judge the structure pressure.
Description of drawings
Fig. 1 is the overall appearance synoptic diagram of nano carbon black piezoelectric ceramics complex cement based sensor.
Fig. 2 is the cross-sectional view of nano carbon black piezoelectric ceramics complex cement based sensor.
Fig. 3 is the perspective structure synoptic diagram of nano carbon black piezoelectric ceramics complex cement based sensor.
Among the figure: 1 lead; 2 nano-level conducting carbon blacks; 3 piezoelectric ceramic pieces; 4 wire nettings.
Embodiment
Be described in detail specific embodiment of the present invention below in conjunction with technical scheme and accompanying drawing.
Cement and nano-level conducting carbon black are utilized the evenly cube block of the mixed 5cm of making * 5cm * 5cm of spreading agent in 5: 1 ratio; Add two copper mesh at a cement cube block built-in; Implant 3 not in same plane and the piezoelectric ceramic piece that links to each other with lead respectively, and utilize lead externally to transmit acoustic emission signal.Carbon black adopts surface treatment or untreated nano-level conducting carbon black, and spreading agent is an aqueous dispersion.
The cement matrix of made can also can adopt other non-cubic shaped by the required cube that is made into various sizes, does not all exceed the scope of this patent protection.
Claims (3)
1. nano carbon black piezoelectric ceramics complex cement base dynamometry flaw detection sensor, it is characterized in that: this sensor comprises four parts: cement matrix, piezoelectric ceramic piece, wire netting and lead; Cement matrix is cement and nano-level conducting carbon black in the even mixed cement that the makes cube block of 5: 1 ratio; Three piezoelectric ceramic piece implantation cement cube blocks are interior and not in same plane, each piezoelectric ceramic piece links to each other with lead respectively; Two wire nettings are set in cement cube block, change the signal that produces owing to pressure through wire netting output carbon granule.
2. a kind of nano carbon black piezoelectric ceramics complex cement base dynamometry flaw detection sensor according to claim 1 is characterized in that, with cement and the nano-level conducting carbon black cube block in the even mixing manufacture 5cm * 5cm of ratio * 5cm of 5: 1.
3. a kind of nano carbon black piezoelectric ceramics complex cement base dynamometry flaw detection sensor according to claim 1 and 2, cube block that it is characterized in that utilizing spreading agent that mixed uniformly cement and nano-level conducting carbon black are made into.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011104136435A CN102495135A (en) | 2011-12-12 | 2011-12-12 | Pressure measurement and crack detection sensor based on nano carbon black and piezoelectric ceramic composite cement |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2011104136435A CN102495135A (en) | 2011-12-12 | 2011-12-12 | Pressure measurement and crack detection sensor based on nano carbon black and piezoelectric ceramic composite cement |
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| CN102495135A true CN102495135A (en) | 2012-06-13 |
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| CN2011104136435A Pending CN102495135A (en) | 2011-12-12 | 2011-12-12 | Pressure measurement and crack detection sensor based on nano carbon black and piezoelectric ceramic composite cement |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104458075A (en) * | 2014-12-31 | 2015-03-25 | 中国矿业大学 | Stress distribution monitoring device and method |
| CN106087696A (en) * | 2016-06-15 | 2016-11-09 | 大连理工大学 | A kind of Filled Steel Tubular Arch Bridge concrete filled steel tube grouting density monitoring method utilizing piezoceramic transducer |
| CN106402124A (en) * | 2016-09-29 | 2017-02-15 | 大连理工大学 | Intelligent bolt device for monitoring dynamic stress conditions of bolt connection |
| CN107702828A (en) * | 2017-09-26 | 2018-02-16 | 沈阳建筑大学 | Concrete perceives intelligence sensor and its preparation method and application certainly with hypersensibility |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1450234A (en) * | 2003-04-17 | 2003-10-22 | 同济大学 | Layered cement base piezoelectric intelligent composite material and preparation method thereof |
| CN1844025A (en) * | 2006-04-20 | 2006-10-11 | 武汉理工大学 | Electro-conductive concrete with nano charcoal black |
| CN101493368A (en) * | 2009-03-02 | 2009-07-29 | 北京航空航天大学 | Method for producing alertness cement-based material pressure sensor and monitoring device |
-
2011
- 2011-12-12 CN CN2011104136435A patent/CN102495135A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1450234A (en) * | 2003-04-17 | 2003-10-22 | 同济大学 | Layered cement base piezoelectric intelligent composite material and preparation method thereof |
| CN1844025A (en) * | 2006-04-20 | 2006-10-11 | 武汉理工大学 | Electro-conductive concrete with nano charcoal black |
| CN101493368A (en) * | 2009-03-02 | 2009-07-29 | 北京航空航天大学 | Method for producing alertness cement-based material pressure sensor and monitoring device |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104458075A (en) * | 2014-12-31 | 2015-03-25 | 中国矿业大学 | Stress distribution monitoring device and method |
| CN106087696A (en) * | 2016-06-15 | 2016-11-09 | 大连理工大学 | A kind of Filled Steel Tubular Arch Bridge concrete filled steel tube grouting density monitoring method utilizing piezoceramic transducer |
| CN106087696B (en) * | 2016-06-15 | 2018-02-16 | 大连理工大学 | A kind of Filled Steel Tubular Arch Bridge concrete filled steel tube grouting density monitoring method using piezoceramic transducer |
| CN106402124A (en) * | 2016-09-29 | 2017-02-15 | 大连理工大学 | Intelligent bolt device for monitoring dynamic stress conditions of bolt connection |
| CN106402124B (en) * | 2016-09-29 | 2018-11-09 | 大连理工大学 | A kind of intelligent bolt device for monitoring bolt connection dynamic stress situation |
| CN107702828A (en) * | 2017-09-26 | 2018-02-16 | 沈阳建筑大学 | Concrete perceives intelligence sensor and its preparation method and application certainly with hypersensibility |
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Application publication date: 20120613 |