CN105486218B - It is a kind of to monitor the smart material strain gauge and application that bituminous pavement strains - Google Patents
It is a kind of to monitor the smart material strain gauge and application that bituminous pavement strains Download PDFInfo
- Publication number
- CN105486218B CN105486218B CN201610017581.9A CN201610017581A CN105486218B CN 105486218 B CN105486218 B CN 105486218B CN 201610017581 A CN201610017581 A CN 201610017581A CN 105486218 B CN105486218 B CN 105486218B
- Authority
- CN
- China
- Prior art keywords
- cylinder shape
- strain gauge
- strain
- smart material
- shape item
- 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
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/16—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring the deformation in a solid, e.g. by resistance strain gauge
- G01B7/18—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring the deformation in a solid, e.g. by resistance strain gauge using change in resistance
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C23/00—Auxiliary devices or arrangements for constructing, repairing, reconditioning, or taking-up road or like surfaces
- E01C23/01—Devices or auxiliary means for setting-out or checking the configuration of new surfacing, e.g. templates, screed or reference line supports; Applications of apparatus for measuring, indicating, or recording the surface configuration of existing surfacing, e.g. profilographs
Abstract
The invention discloses a kind of smart material strain gauge of monitoring bituminous pavement strain and applications, including cylinder shape item, it is separately mounted to the fixing element for fixed column bodily form item at cylinder shape both ends, several built-in electrodes are provided in cylinder shape item, the fixing end is made of black nylon 66, cylinder shape item is made of the compound smart material of nylon66 fiber base, and encapsulated layer is arranged on the outside of cylinder shape item.The compound smart material of nylon66 fiber base is mixed with by melted nylon 66 and conductive phase, and the conductive phase is one of carbon nanotube of graphite, nickel powder, carbon nanotube or plating nickel on surface or a variety of mixtures.The compound smart material of nylon66 fiber base of the invention has excellent smart property, strained situation can be converted to electric signal, be the core component of strain gauge, can be suitably used for the detection of strain, and reliability is high, and accuracy is good.The compound smart material of nylon66 fiber base and asphalt concrete pavement have good compatibility of deformation, can the strain of accurate measurements bituminous pavement.
Description
Technical field
The present invention relates to a kind of smart material strain gauge of monitoring bituminous pavement strain and applications, belong to road monitoring neck
Domain.
Background technique
Asphalt Pavement is the main pavement structure form in China.Since asphalt pavement material, structure, construction technology are answered
Polygamy, the mechanical analysis of asphalt pavement structure, field monitoring are very difficult, and Pavement Design and application person are difficult to accurately grasp pitch
The mechanical state on road surface, this is very unfavorable to the determination of asphalt pavement structure design and maintenance program, and leads to a large amount of pitch
Thus early damage to pavement occurs serious project amount waste, adversely affects to driving, and causes other societies and environment
Problem.Under warm, wet and Vehicle Load complex environment, the mechanical state of asphalt concrete structure layer is sufficiently complex.It is quasi-
Scientific design of the mechanical state for road surface for really grasping asphalt pavement structure reduces the earlier period damage of bituminous pavement to Guan Chong
It wants.
Currently, monitoring road surface deflection be engineering circles evaluation pavement structure mechanical state common method, due to analysis method,
Material parameter etc. influences, and is difficult to obtain the practical mechanical state inside pavement structure in this way, can not be pavement structure
Design, maintenance scientific basis is provided, the test of bituminous texture layer interior mechanics state seems very necessary.Currently, asphalt road
In the monitoring of face structural stress strain, resistance strain plate is occupied an leading position, and Fiber Bragg Grating technology also has application.But due to tradition
Monitoring element needs pre-buried in bituminous concrete and high temperature to roll, and this special moulding process and severe working environment make
Monitoring element survival rate is low, durability is poor.Therefore, it needs in the bituminous texture layer that one kind is low in cost, reliable, durability is good
Portion's stress-strain test technology.
Summary of the invention
In view of the above-mentioned drawbacks of the prior art with deficiency, the present invention is quasi- to propose a kind of machine that monitoring bituminous pavement strains
Quick material strain meter and application.There is the strain gauge high sensitivity, structure to be simple and convenient to operate, is low in cost, high reliablity with
And durability it is good the features such as, it can be achieved that automatic monitoring and signal collection.
In order to achieve the above object, The technical solution adopted by the invention is as follows:
A kind of compound smart material of nylon66 fiber base, is mixed with, the conductive phase by melted nylon 66 and conductive phase
One of carbon nanotube for graphite, nickel powder, carbon nanotube or plating nickel on surface or a variety of mixtures.
For the graphite mutually in the allotrope of carbon, phosphorus content is high, and conductivity is high, and property stabilization (refers mainly to resistance to
It is hot, corrosion-resistant, do not reacted with substrate, durability is good), it is easy dispersion, it is low in cost；The nickel powder conductive phase belongs in metal powder
, property stabilization high in conductivity, the material for being easy dispersion, moderate cost；The carbon nanotube of the carbon nanotube and plating nickel on surface
Electric conductivity is preferable, and property is stablized, and is easier to disperse, agility is excellent.
Preferably, when conductive phase is graphite, the mass ratio of graphite and nylon66 fiber is 30-60:100；When conductive phase is nickel
When powder, the mass ratio of nickel powder and nylon66 fiber is 20-50:100；When conductive phase is carbon nanotube, carbon nanotube and nylon66 fiber
Mass ratio is 1-5:100；When conductive phase is the nickel-plating carbon nanotube of plating nickel on surface, the carbon nanotube and nylon66 fiber of plating nickel on surface
Mass ratio be 1-5:100.
The carbon nanotube of plating nickel on surface can improve conductivity in the case where not influencing the excellent agility of carbon nanotube,
And it is conducive to dispersion.
The blending of conductive phase can gather the advantage of all kinds of conductive phases, in the case where conduction compares small volume, obtain good
Good electric conductivity and excellent agility.
Application of the above-mentioned compound smart material of nylon66 fiber base in the strain gauge of preparation monitoring bituminous pavement strain.
A kind of smart material strain gauge of monitoring bituminous pavement strain, including cylinder shape item, it is separately mounted to cylinder shape item
The fixing element for fixed column bodily form item at both ends is provided with several built-in electrodes, the fixing element in cylinder shape item
It is made of black nylon 66, cylinder shape item is made of the compound smart material of nylon66 fiber base, setting encapsulation on the outside of cylinder shape item
Layer.
Encapsulating material therefor can be resin, adhesive etc., need to meet insulation, moisture-proof anticorrosive, high temperature resistant (205 DEG C) etc. and want
It asks.
Preferably, the strain gauge includes monitoring bituminous pavement stretching strain strain gauge and monitoring bituminous pavement compressive strain strain
Meter, the fixing element are cylindrical shield.
It is further preferred that any two points line of the length of the cylinder shape item of the stretching strain strain gauge and each bottom surface
Length maximum ratio be 15~20, each bottom surface any two points wire length be less than or equal to need to monitor bituminous texture thickness
One third.
The cylinder is positive cylinder, and bottom surface refers to that horizontal two sides are parallel to each other and identical two faces of size, in contrast
Be side, lateral feature, that is, each adjacent two face intersection is parallel to each other, this intersection is that cylinder is high namely the length of cylinder shape item
Degree.
The stretching strain strain gauge main purpose is for monitoring bituminous texture stretching strain, most preferably monitoring shape in bottom or layer layer by layer
State is that monitoring element is infinitely small, only monitors the strain of a certain specified point.But in practical applications, it need to consider that element itself makes work
The operability of skill and the sensitivity of alert and resourceful reaction；And component size should be reduced as far as possible, keep monitoring region small as far as possible, improves prison
Survey precision, the logarithmic strain situation of Lai Fanying bituminous pavement.Consider general every a layer thickness of bituminous texture layer, makes the above rule
It is fixed.
It is further preferred that compressive strain strain gauge both ends cylindrical shield size requires to be the section half of cylindrical shield
Diameter is greater than the radius in the section of cylinder shape item；The length of cylinder shape item should be less than equal to required monitoring of structures thickness degree two/
One, any two points wire length is less than or equal to the length of cylinder shape item on each bottom surface of cylinder shape item.
Preferably, the encapsulated layer includes rubberised layer and the casing that is linked on the outside of rubberised layer.
Preferably, the number of the built-in electrode is two, and two built-in electrodes are arranged in parallel.
Stretching strain strain gauge level is embedded in the layer of structure sheaf to be monitored by the application method of above-mentioned smart material strain gauge
In bottom or layer；Or compressive strain strain gauge is embedded in vertically in the layer top or layer of structure sheaf to be monitored, cylinder shape item is parallel to drip
It is vertical embedding to be horizontal embedding when green structure sheaf is embedding, when cylinder shape item is embedding vertically.
Application of the above-mentioned smart material strain gauge in monitoring bituminous pavement strain, the parameter of strain gauge include failure area
Between, monitoring section, sensitivity and operating temperature range.
Preferably, the failure section of strain gauge is 30000 μ ε of >, and monitoring section is 8%~10%, sensitivity 0.0025
~0.01%/μ ε, operating temperature range are -20~70 DEG C.
It will not be destroyed under big strained situation in this strain gauge use, large-scale strain value can be monitored；Sensitivity is moderate,
It can incude compared with small strain without vulnerable to external interference, stability is preferable；Strain gauge operating temperature range is extensive, adapts to asphalt road
The variation of face temperature is adapted to the long term monitoring strained in bituminous pavement operation.
Beneficial effects of the present invention are as follows:
1, the compound smart material of nylon66 fiber base of the invention has excellent smart property, strained situation can be converted to electricity
Signal is the core component of strain gauge, can be suitably used for the detection of strain, and reliability is high, and accuracy is good.
2, the compound smart material of the nylon66 fiber base and asphalt concrete pavement have good compatibility of deformation, can accurately supervise
Survey bituminous pavement strain.
3, each element composition raw material sources of strain gauge of the invention are extensive, and cheap, moulding process is relatively simple, cost
It is cheap, bituminous pavement strain regime monitoring cost can be effectively reduced, can be widely applied with large-scale popularization.
Detailed description of the invention
Fig. 1 is stretching strain strain gauge structure schematic diagram of the invention；
Fig. 2 is compressive strain strain gauge structure schematic diagram of the invention；
Fig. 3 is smart material strain-resistance change rate figure.
Wherein, 1, cylinder shape item, 2, built-in electrode, 3, cylindrical shield, 4, external circuit.In Fig. 3, dotted line indicates strain,
Solid line indicates resistance change rate.
Specific embodiment
The present invention is further explained in the light of specific embodiments:
As depicted in figs. 1 and 2, it is a kind of monitoring bituminous pavement strain smart material strain gauge, including cylinder shape item 1, point
It is not mounted on the cylindrical shield 3 for fixed column bodily form item 1 at 1 both ends of cylinder shape item, is provided in several in cylinder shape item 1
Electrode 2 is set, the cylindrical shield 3 is made of black nylon 66, and cylinder shape item 1 is by the compound smart material system of nylon66 fiber base
At encapsulated layer being arranged on the outside of cylinder shape item 1, built-in electrode 2 is connect with external circuit 4.
In the two classes strain gauge the compound smart material of nylon66 fiber base be mixed by melted nylon 66 and conductive phase and
First black nylon 66 should be fully mixed with conductive phase when at, preparation, double screw extruder is added after stirring 2~5min, squeezes out 2
~3 times, extrudate is shaped with injection molding machine.
Cylinder shape item 1 made of the compound smart material of the stretching strain strain gauge nylon66 fiber base is high to be connected with bottom surface any two points
Line maximum value ratio is 15~20, and bottom surface any two points wire length is less than or equal to that the one third of bituminous texture thickness need to be monitored.
Both ends cylinder fixing end is cylindrical shield 3, and when being mainly used for embedding, strain gauge is fixed on bituminous texture layer to be measured.Specific ruler
Very little requirement is that 3 section radius of cylindrical shield should be greater than the section radius of cylinder shape item 1, and 3 draw ratio of cylindrical shield should be smaller, with
Subject to fixation.
Two built-in electrodes 2 are arranged in the cylinder shape item 1 of the stretching strain strain gauge, are parallel to the setting of 3 bottom surface of cylindrical shield,
It is used for measurement, 2 protective layer thickness of built-in electrode (electrode distance bottom surface distance) is set as not less than 5mm.Built-in electrode 2 can be
Netted, coiled type etc., also one plane of independent formation.Stainless steel, copper, aluminium, alloy etc. can be used in the material of built-in electrode 2
Material.Having a size of being adapted to sensor element size.
The outside of the stretching strain strain gauge cylinder shape item 1 needs to be packaged protection, and external environment is isolated.Encapsulated layer should be with
Element fitting is close, and encapsulation material therefor can be resin, adhesive etc., need to meet insulation, moisture-proof anticorrosive, high temperature resistant (205 DEG C)
Deng requirement.
Cylindrical shield size requirement in compressive strain strain gauge both ends is that the section radius of cylindrical shield 3 should be greater than cylinder
The section radius of shape item 1,3 draw ratio of cylindrical shield should be smaller, subject to fixation；The compound smart material of nylon66 fiber base is made
1 height of cylinder shape item should be less than the half equal to required monitoring of structures thickness degree, bottom surface any two points wire length is less than
Equal to the height of cylinder shape item 1.
Two built-in electrodes 2 are arranged in the compressive strain strain gauge cylinder shape item 1, are parallel to the bottom surface setting of cylindrical shield 3,
It is used for measurement, 2 protective layer thickness of built-in electrode (electrode distance bottom surface distance) is set as not less than 5mm.Built-in electrode 2 can be
Netted, coiled type etc., also one plane of independent formation.The materials such as stainless steel, copper, aluminium, alloy can be used in built-in electrode material
Material.Having a size of being adapted to sensor element size.
It needs to be packaged protection outside the compressive strain strain gauge cylinder shape item 1, external environment is isolated.Encapsulated layer Ying Yuyuan
Part fitting is close, and encapsulation material therefor can be resin, adhesive etc., need to meet insulation, moisture-proof anticorrosive, high temperature resistant (205 DEG C) etc.
It is required that.
The strain gauge has good smart property, for this sentences compressive strain strain gauge, by its component test curve
Can obtain failure section, monitoring section, sensitivity and work parameters, the stretching strain such as temperature range be identical with this.
Know that the flexural strength of material exists by the flexural strength of the compound smart material of strain gauge element composition material nylon66 fiber base
31.79MPa, the modulus of material are 757.6MPa, then its compressive ultimate strain is 40000 μ ε, consider that safety coefficient and road surface are practical
Bearing load, the failure section of strain gauge are 30000 μ ε of >.
The monitoring section of the strain gauge i.e. its test scope, characterization system are able to bear the ability of maximum input quantity, can
It is calculated by following formula:
YFS=YH-YL,
Wherein, YFSFor test scope, YHFor the average value (%) for measuring upper limit institute output quantity, YLIt is exported by measurement lower limit
The average value (%) of amount.
Test scope is to export the difference of maximum resistance change rate and minimum resistance change rate herein, is illustrated in figure 3
10%.Consider that the otherness of strain gauge, test scope can be 8%~10%.
The strain gauge sensitivity refers to that the variable quantity of measuring system output quantity refers to the variable quantity of measuring system output quantity
The ratio of Δ y and the variation delta x of input quantity:
Sensitivity=Δ y/ Δ x.
Here, input quantity is strain, and when output quantity is resistance change rate, sensitivity is are as follows:
Wherein, KεTo strain corresponding sensitivity coefficient, Δ R/R is resistance change rate, and Δ ε is strain variation amount.
As shown in figure 3, sensitivity is 0.0025%/μ ε.Consider its otherness, the sensitivity of strain gauge is up to 0.0025
~0.01%/μ ε.
The temperature range of the strain gauge work considers the relationship of element smart property and temperature, the temperature of strain gauge work
Spending range is -20~70 DEG C.In practical operation, need to consider temperature-compensating, concrete operation method is in the embedding phase of same section
Same strain gauge is located at the position that pavement edge does not stress, is only affected by the surrounding environment, for monitoring the change of environment temperature
Change, obtain the relationship between temperature and resistance change rate, strain gauge institute measured data subtracts the variation as caused by temperature, eliminates temperature
Influence to strain gauge monitoring pavement strain
Above-mentioned, although the foregoing specific embodiments of the present invention is described with reference to the accompanying drawings, not to invention protection scope
Limitation, those skilled in the art should understand that, based on the technical solutions of the present invention, those skilled in the art are not required to
It is still within the scope of the present invention to make the creative labor the various modifications or changes that can be made.
Claims (4)
1. a kind of smart material strain gauge of monitoring bituminous pavement strain, it is characterised in that: including cylinder shape item, be separately mounted to
The fixing element for fixed column bodily form item at cylinder shape both ends is provided with several built-in electrodes in cylinder shape item, described
Fixing end is made of black nylon 66, and cylinder shape item is made of the compound smart material of nylon66 fiber base, sets on the outside of cylinder shape item
Set encapsulated layer；
The compound smart material of nylon66 fiber base is mixed with by melted nylon 66 and conductive phase, and the conductive phase is graphite, nickel
One of carbon nanotube of powder, carbon nanotube or plating nickel on surface or a variety of mixtures；
When conductive phase is graphite, the mass ratio of graphite and nylon66 fiber is 30-60:100；When conductive phase be nickel powder when, nickel powder with
The mass ratio of nylon66 fiber is 20-50:100；When conductive phase is carbon nanotube, the mass ratio of carbon nanotube and nylon66 fiber is 1-5:
100；When conductive phase is the carbon nanotube of plating nickel on surface, the mass ratio of nickel-plating carbon nanotube and nylon66 fiber is 1-5:100；
The strain gauge includes monitoring bituminous pavement stretching strain strain gauge and monitoring bituminous pavement compressive strain strain gauge, the fixation
Element is cylindrical shield；
The maximum ratio of the length of any two points line of the length and each bottom surface of the cylinder shape item of the stretching strain strain gauge
It is 15~20, each bottom surface any two points wire length is less than or equal to that the one third of bituminous texture thickness need to be monitored；
The encapsulated layer includes rubberised layer and the casing that is linked on the outside of rubberised layer, and the encapsulated layer is bonded with smart material element
Closely；
The parameter of strain gauge includes failure section, monitoring section, sensitivity and operating temperature range；
The failure section of strain gauge is 30000 μ ε of >, and monitoring section is 8%~10%, and sensitivity is 0.0025~0.01%/μ
ε, operating temperature range are -20~70 DEG C.
2. smart material strain gauge according to claim 1, it is characterised in that: compressive strain strain gauge both ends cylindricality gear
Board size requires, and the section radius of cylindrical shield is greater than the radius in the section of cylinder shape item；The length of cylinder shape item should be less than
Equal to the half of required monitoring of structures thickness degree, any two points wire length is less than or equal on each bottom surface of cylinder shape item
The length of cylinder shape item.
3. smart material strain gauge according to claim 1, it is characterised in that: the number of the built-in electrode is two,
Two built-in electrodes are arranged in parallel.
4. the application method of any smart material strain gauge of claim 1-3, it is characterised in that: by stretching strain strain gauge water
It is flat to be embedded in the layer bottom or layer of structure sheaf to be monitored；Or compressive strain strain gauge is embedded in the layer top of structure sheaf to be monitored vertically
Or in layer, cylinder shape item be parallel to bituminous texture layer it is embedding when to be horizontal embedding, when cylinder shape item is embedding be vertically vertical embedding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610017581.9A CN105486218B (en) | 2016-01-12 | 2016-01-12 | It is a kind of to monitor the smart material strain gauge and application that bituminous pavement strains |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610017581.9A CN105486218B (en) | 2016-01-12 | 2016-01-12 | It is a kind of to monitor the smart material strain gauge and application that bituminous pavement strains |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105486218A CN105486218A (en) | 2016-04-13 |
| CN105486218B true CN105486218B (en) | 2019-07-02 |
Family
ID=55673357
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610017581.9A Active CN105486218B (en) | 2016-01-12 | 2016-01-12 | It is a kind of to monitor the smart material strain gauge and application that bituminous pavement strains |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105486218B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6759689B2 (en) | 2016-05-10 | 2020-09-23 | ヤマハ株式会社 | Distortion sensor unit |
| CN108547203A (en) * | 2018-04-23 | 2018-09-18 | 河海大学 | Bituminous paving DEFORMATION MONITORING SYSTEM based on OFDR and application method |
| CN109631742B (en) * | 2018-12-25 | 2020-10-02 | 东南大学 | Flexible strain sensor based on carbon nano tube and preparation method thereof |
| CN112097814A (en) * | 2020-09-17 | 2020-12-18 | 山东大学 | I-shaped sensor and preparation method thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6079277A (en) * | 1997-12-12 | 2000-06-27 | The Research Foundation Of State University Of New York | Methods and sensors for detecting strain and stress |
| CN200993573Y (en) * | 2006-12-25 | 2007-12-19 | 山东大学 | Device for measuring highway surface structural strain |
| 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 |
| CN103214844A (en) * | 2013-05-04 | 2013-07-24 | 吉林大学 | Graphene/nylon 66 conductive nano composite material and preparation method thereof |
| CN203501972U (en) * | 2013-10-25 | 2014-03-26 | 山东交通学院 | Bituminous pavement horizontal-H type multi-row strain sensor |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001153603A (en) * | 1999-11-26 | 2001-06-08 | For Life:Kk | Maximum value storing type sensor for detecting amount of deformation and method for measuring amount of deformation of structure by using the sensor |
-
2016
- 2016-01-12 CN CN201610017581.9A patent/CN105486218B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6079277A (en) * | 1997-12-12 | 2000-06-27 | The Research Foundation Of State University Of New York | Methods and sensors for detecting strain and stress |
| CN200993573Y (en) * | 2006-12-25 | 2007-12-19 | 山东大学 | Device for measuring highway surface structural strain |
| 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 |
| CN103214844A (en) * | 2013-05-04 | 2013-07-24 | 吉林大学 | Graphene/nylon 66 conductive nano composite material and preparation method thereof |
| CN203501972U (en) * | 2013-10-25 | 2014-03-26 | 山东交通学院 | Bituminous pavement horizontal-H type multi-row strain sensor |
Non-Patent Citations (1)
| Title |
|---|
| 沥青基路用传感器材料的试验研究;吴少鹏等;《华中科技大学学报（城市科学板）》;20080630;第11页第3、5-6段，第12页第1-2段，图1-2 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105486218A (en) | 2016-04-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105486218B (en) | It is a kind of to monitor the smart material strain gauge and application that bituminous pavement strains | |
| Wen et al. | Piezoresistivity-based strain sensing in carbon fiber-reinforced cement | |
| CN101793020A (en) | Geogrid strain testing device and testing method thereof | |
| CN103453833B (en) | A kind of long gauge-length carbon fiber strain sensing devices and method of testing thereof | |
| CN102121860A (en) | Corrugated diaphragm type pipe external pressure sensor, oil-water well casing external pressure monitoring device and method | |
| CN209483400U (en) | A kind of intelligent grouting cable anchor | |
| D’Alessandro et al. | Stainless steel microfibers for strain-sensing smart clay bricks | |
| CN204902780U (en) | Optic fibre bragg grating array strain sensor of high sensitivity high resolution high accuracy | |
| CN101509757A (en) | Carbon fibre conducting cement-based composite material engineering strain measuring system | |
| CN101050985A (en) | Local monitoring pressure sensitive cement base stress and strain sensor of concrete structure | |
| CN105300575B (en) | Monitor smart material sensor, making and the application method of bituminous paving compression | |
| CN101886954A (en) | Cement-based temperature sensing element for positive and negative temperature automatic measurement | |
| CN203148372U (en) | Micro resistor type displacement meter based on full-bridge electrometric method | |
| CN102506691B (en) | Cement-based intelligent composite material strain sensor with temperature compensation function | |
| CN101586989B (en) | Fiber grating temperature sensor for electrolytic bath shell | |
| CN205279986U (en) | Smart material strainometer that monitoring bituminous paving meets an emergency | |
| CN105623193A (en) | Distributed carbon fiber bar and preparation method and strain determination method thereof | |
| CN105157591A (en) | High-sensitivity high-resolution high-precision fiber Bragg grating array strain sensor | |
| CN201903328U (en) | Embedded type vertical FBG (Fiber Bragg Grating) strain transducer for pavement | |
| CN103015974B (en) | A kind of oil-base mud logging instrument measuring probe | |
| CN109612378A (en) | A kind of resistance-strain type displacement meter and preparation method thereof | |
| CN205907591U (en) | Intelligence benzvalene form support, monitoring support and intelligent support system | |
| CN105091729B (en) | A kind of extend Strain Extensometer of bar of invar steel that adopts | |
| CN201983881U (en) | Cement-based temperature sensing element applicable in positive and negative temperature self-test | |
| CN108534661A (en) | A kind of strain transducer and its application method of monitoring asphalt pavement rut compressive strain |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |