CN104749239B - A kind of asphalt face crack monitoring method - Google Patents
A kind of asphalt face crack monitoring method Download PDFInfo
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- CN104749239B CN104749239B CN201510144503.0A CN201510144503A CN104749239B CN 104749239 B CN104749239 B CN 104749239B CN 201510144503 A CN201510144503 A CN 201510144503A CN 104749239 B CN104749239 B CN 104749239B
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Abstract
A kind of asphalt face crack monitoring method, including conductive material, lead-out tablet, wire, data acquisition device and computer.The conductive material is applied to surface of test piece formation and does not close galvanic circle, the lead-out tablet do not close the both ends of galvanic circle respectively with it is described do not close galvanic circle and the wire be connected after access data acquisition device and connect computer, power circuit is formed, the data acquisition device to surface of test piece crackle can monitor and show on computers in real time by the break-make of circuit.The present apparatus and method have the characteristics of being used under high sensitivity, complex situations, cost is cheap, easy to utilize, solve the problems, such as existing test device and method complex operation, expensive equipment, be not easy to use in complex situations, use range it is limited, it is significant that preventing and treating is destroyed to research Load materials mechanical characteristic and pavement structure.
Description
Technical field
The invention belongs to field of road, specially a kind of asphalt face crack monitoring method.
Background technology
Since reform and opening-up, highway is always that China's year dynamics of investment is maximum, with the fastest developing speed focuses the consruction on field；
By the end of the year 2014, China is completed the highway being open to traffic and breaches 100,000 kilometers.According to development plan, in the hereafter more than ten years
Newly-built tens thousand of kilometers of highways and gigameter common road are also wanted, more there are several substantial amounts of bituminous pavings to need repairing transformation.
China have accumulated rich experience, solve many key technical problems in highway construction practice.But from recent years
Come from the point of view of the highway behaviour in service that has put into effect, it is most of be not up to service life be occur more serious function decay and
Structural failure, many design periods are the pavement structure of 15 years, occur destroying on a large scale in 5~8 years after open to traffic,
Cause huge economic loss and bad social influence.
When studying surface feature decay and structural failure, it is determined that the source of destruction is crucial.And field measurement is complex, need
Substantial amounts of human and material resources and financial resources are expended, and the requirement to instrument and equipment is higher.Therefore, road work person devises one
The indoor mechanical test of series, such as direct tensile test, bend test, uniaxial compression test, diametral compression test, the axle of asphalt three
Experiment carrys out certain stress of simulated roadway structure, and the mechanical property of ground surface material is judged by the intensity level of measure.
Under normal circumstances, when carrying out indoor intensity experiment, the broken of test specimen can be defined with the appearance of ultimate bearing capacity or initial crack
It is bad.Difference to destroying definition is different by the intensity for causing material.Such as in asphalt bend test, test specimen is at first
Ftractureed in span centre bottom.Destroyed if being defined with Initial Cracking, the intensity measured will measure less than destruction is defined with ultimate bearing capacity
Intensity.And strength of materials value is different, the design of pavement structure can be significantly affected again.
At present, the method for road scientific research personnel generally use patch foil gauge judges the generation of face crack.But work as examination
When part surface configuration complexity or more narrow and small space, it is difficult to paste foil gauge, govern the use range of foil gauge.As pitch mixes
Close material triaxial test and use overall diameter as 100mm, interior diameter 20mm, a height of 100mm hollow circular cylinders test specimen, if to judge
Test specimen at first inner periphery still outer cylinder surface occur to destroy it is necessary in inner periphery and outer cylinder surface simultaneously
Paste foil gauge.It is clear that it is more difficult that a diameter of 20mm hollow cylinder intrados, which pastes foil gauge, inside.This
Outside, in engineer applied, also it is not easy to using strain built-in testing in the corner of structure.In recent years, in order to detect specimen crack
Occur, the rule of development, road researcher begins to use CT scan technology, is imaged to obtain the figure of test specimen section by CT scan
Picture.But CT pilot systems are expensive, complex operation, millions of members are spent easily, it is difficult to popularization and application.In addition, CT scan
It is to be put into industry CT to be scanned with the test specimen after destruction before destroying mostly, it is difficult to realize the real-time monitoring during experiment.
The content of the invention
The purpose of the present invention is to solve the shortcomings of the prior art provide a kind of high sensitivity, it is simple and easy, be easy to promote,
It is suitable for Load materials and the asphalt face crack monitoring method of strain built-in testing and CT scan defect can be overcome.
The present invention is achieved through the following technical solutions above-mentioned purpose：
A kind of asphalt face crack monitoring method, comprises the following steps：
S100, surface of test piece are handled, and its surface is kept smooth, closely knit；
S200, a kind of elongation percentage of selection and conductive material similar in test specimen, the table of test specimen is uniformly applied to by groove
Face, form the not loop of conduction；
S300, form galvanic circle；Lead-out tablet is placed on to the both ends for not closing galvanic circle, respectively with the conduction material
What material was formed does not close access data acquisition device and computer after galvanic circle simultaneously connects with the wire, forms galvanic circle；
S400, the connected state for checking galvanic circle, data acquisition device and computer are opened, check circuit whether in company
Logical state；If being in connected state, can be tested；Otherwise, galvanic circle is checked, until circuit is in connected state
Only；
S500, test specimen is tested, if crack occurs for surface of test piece, galvanic circle will be switched off, connection data acquisition dress
The computer put will time that accurately real-time writing circuit disconnects, the time is the cracking time of surface of test piece, so as to real
Now to the real-time monitoring of surface of test piece crackle.
Brief description of the drawings
Fig. 1 is does not close conducting ring layout diagram, wherein (a) represents that not closing conducting ring lays schematic elevation view, (b)
Expression does not close conducting ring and lays schematic top plan view；
Fig. 2 is planar compression/axial compression test curve and surface of test piece cracking time.
Embodiment
The present invention is illustrated below in conjunction with accompanying drawing 1 to Fig. 2 and further detailed description.It may be noted that
It is that explanation is only for example, not appointing to these technical schemes to claimed technical scheme below
What is limited.Protection scope of the present invention is defined by the content that appended claims are recorded.
A kind of asphalt face crack monitoring method, comprises the following steps：
S100, surface of test piece are handled, and its surface is kept smooth, closely knit；
S200, a kind of elongation percentage of selection and conductive material similar in test specimen, the table of test specimen is uniformly applied to by groove
Face, form the not loop of conduction；
S300, form galvanic circle；Lead-out tablet is placed on to the both ends for not closing galvanic circle, respectively with the conduction material
What material was formed does not close access data acquisition device and computer after galvanic circle simultaneously connects with the wire, forms galvanic circle；
S400, the connected state for checking galvanic circle, data acquisition device and computer are opened, check circuit whether in company
Logical state；If being in connected state, can be tested；Otherwise, galvanic circle is checked, until circuit is in connected state
Only；
S500, test specimen is tested, if crack occurs for surface of test piece, galvanic circle will be switched off, connection data acquisition dress
The computer put will time that accurately real-time writing circuit disconnects, the time is the cracking time of surface of test piece, so as to real
Now to the real-time monitoring of surface of test piece crackle.
Preferably, in S100, the test specimen is by static pressure or a diameter of 100mm of gyratory compaction molding, a height of
100mm asphalt cylinder, then be to obtaining overall diameter after the asphalt cylinder test specimen core boring sampling
100mm, interior diameter 20mm, a height of 100mm asphalts hollow circular cylinder test specimen；Periphery is high inside and outside the test specimen
There is the datum line that width is 0.6mm 20mm, 40mm, 60mm, 80mm position, are easy to smear conductive material, also can be as needed
Datum line is made in other positions.
Preferably, in s 200, it is 0.6mm by width from conductive material similar in a kind of and test specimen elongation percentage
Groove be uniformly applied to the position of periphery high 20mm, 40mm, 60mm, 80mm inside and outside test specimen, form multiple first not
Galvanic circle is closed, meanwhile, conductive material is smeared between test specimen upper surface internal diameter and external diameter, forms the second conduction do not closed
Loop；The conductive material is low temperature normal temperature cure conductive silver glue, and its constituent is mainly silver powder, mass percent 80%
Left and right；Other components are resin, accelerator, curing agent and diluent etc., and it is 20% or so to add up to mass percent.This conduction
Silver paste has the characteristics of solidification temperature is low, easy bonding, electric performance stablity.Surface of test piece can be attached to well, and it is solid faster
Change.Specifically comprise：Flake silver powder 80%, organic resin 8%, diluent 6%, curing agent 4% and curing accelerator 2%；Its
In flake silver powder be flake silver powder that particle diameter is 0.1~4 μm, purity >=99.9%.Above-mentioned organic resin is polyacrylic acid tree
Fat, diluent are 2-Butoxyethyl acetate, and curing agent is 1-cyanoethyl-2-phenylimidazole, curing accelerator 4,4- diaminos
Base benzylimidazole.
Preferably, in S400, the data acquisition device has 16 independent TCH test channels, each TCH test channel
With independent power supply, and TCH test channel quantity can continue to extend.
Preferably, in S500, interior air bag is built into the hollow cylinder test specimen, then passes through the MTS testings of materials
Machine applies vertical load, loading velocity 2mm/min, test specimen inner surface is in plane tension and compression/be compressed axially stress, directly
Destroyed to test specimen.The make-and-break time of the closing galvanic circle of collection can be as accurate as 0.01 second.
A kind of monitoring device using the above method, it include conductive material, lead-out tablet, wire, data collecting system and
Computer.The elongation percentage of the conductive material should equably be smeared close to the elongation percentage of test specimen, conductive material by the groove of customization
On the surface of test specimen；Described to have 16 independent TCH test channels according to harvester, each passage has independent power supply, and passage
Number can continue to extend, and have the characteristics of strong interference immunity, high sensitivity；What the conductive material was formed does not close conducting ring
Both ends be sequentially connected with lead-out tablet, wire, data acquisition device and computer, form galvanic circle, turn-on data harvester
After computer, the cracking of surface of test piece by the time of circuit disconnection, can be judged.
The most basic embodiment of the present invention is to propose a kind of asphalt face crack monitoring device, including examination
Part, lead-out tablet, wire, data acquisition device and computer；Conductive material, which is smeared, in the test specimen outer surface forms multiple first
Do not close galvanic circle；Meanwhile conductive material is smeared between test specimen upper surface internal diameter and external diameter, form one or more second
The galvanic circle do not closed；The lead-out tablet, which is located at, does not close the both ends of galvanic circle, by wire and data acquisition device and
Computer connects to form conductive path；Finally, the generation of crackle is judged by the break-make of conductive path.
Embodiment 1
Below by taking asphalt plane tension and compression/axial compression test as an example, how introduction is split using Load materials surface
Line monitoring device and method judge the cracking of surface of test piece：
(1) static pressure or a diameter of 100mm of gyratory compaction molding, a height of 100mm cylinder bitumen mixture specimen, drill core
It is 100mm that overall diameter is obtained after sampling, interior diameter 20mm, a height of 100mm hollow circular cylinders test specimen.
(2) after carrying out polishing processing to surface of test piece, respectively test specimen inner surface and the high 20mm, 40mm in outer surface, 60mm,
Picture horizontal line makes a mark at 80mm.
(3) from conductive material or conducting solution (such as conductive silver) similar in a kind of and test specimen elongation percentage, it is by width
0.6mm groove, test specimen inner periphery and outer cylinder surface high 20mm, 40mm, 60mm, 80mm position are uniformly applied to,
Form multiple conductive rings do not closed.Meanwhile conductive material is smeared between test specimen upper surface internal diameter and external diameter, form one
The conductive ring do not closed, as shown in Figure 1.
(4) lead-out tablet, wire, data acquisition device and computer are sequentially connected with the conductive ring both ends do not closed.Each
A passage for not closing conductive ring access data acquisition device is connected with computer, turn-on data acquisition system and computer, structure
Into a power circuit.
(5) check whether power circuit open circuit occurs.If there is open circuit, using the logical of the piecewise test circuit of universal meter
It is disconnected；Check whether lead-out tablet is closely connected with the conductive ring and wire do not closed；Until the conductive ring do not closed, extraction
Untill piece, wire, data acquisition device and computer form power circuit.
(6) by hollow cylinder test specimen in 15 DEG C of temperature control box inside holding 6 hours with and the air bag in the assembling of test specimen inner chamber
After-applied 0.5MPa constant air pressure, vertical load is then applied by MTS Material Testing Machine, loading velocity 2mm/min, made
Test specimen inner surface is in plane tension and compression/be compressed axially stress, until test specimen destroys, and records leading to for each galvanic circle
The disconnected time.Load time-curves of stress-strain relationship of test specimen is obtained by MTS Material Testing Machine, Load materials surface is split
Line monitoring device record test specimen inner surface, upper surface, the cracking time mark point of outer surface on trial curve, obtain Fig. 2.
(7) as can be seen from Figure 2, point A is the test specimen inner surface cracked time, is 63.81 seconds after on-test；Point B
It is 64.47 seconds after on-test for the test specimen upper surface cracked time；Point C be test specimen inner surface it is cracked when
Between, it is 65.53 seconds after on-test.That is, in asphalt plane tension and compression/axial compression test, in test specimen
Surface is cracked at first；With the increase of load, crackle extends rapidly from inside to outside, until test specimen loses bearing capacity
Destroy.
(9) stress state of test specimen inner surface corresponding to A time points is defined as to the ultimate strength of material, pitch is obtained and mixes
Close plane tension and compression/axial compression strength (σ of material1、σ2、σ3) it is (0.542MPa, -0.5MPa, -5.414MPa).
In order to whether prove hollow cylinder test specimen under the comprehensive function of interior air bag and vertical load at first in inner surface
Destroy, carried out corresponding mcta analysis：Li Jianlin is 220mm to external diameter, internal diameter 100mm, a height of 250mm it is hollow
Cylinder test specimen has carried out the experiment of three axle pressure-pressure-tensile strengths.He by pasting foil gauge to test specimen inner surface and outer surface, it is auxiliary it
The just method split is differentiated with Acoustic radiating instrument, drawn under the collective effect of chamber pressure and axial stress, cylinder test specimen at first from
The conclusion of inner surface cracking, this is consistent with the result of the test obtained using Load materials face crack monitoring method.
But if asphalt is tested using large scale test specimen, required vertical load, which will exceed MTS materials, to be tried
Machine range is tested, experiment will be caused to be difficult to；And overall diameter is used as 100mm, and interior diameter 20mm, a height of hollow circles of 100mm
Cylinder test specimen is difficult to monitor face crack by pasting foil gauge again, and the present invention solves this technological deficiency well.If
Load materials face crack monitoring device and method are applied to pavement structure, the crackle that the table that can satisfy the need occurs from top to down is carried out
Monitoring in real time, it is significant that this destroys preventing and treating to research Load materials mechanical characteristic and pavement structure.
In summary, the present invention solves the problems, such as that tradition strain built-in testing use range is limited；Overcome CT scan behaviour
Make complicated, testing equipment costliness, be difficult to monitoring in real time during experiment, be difficult to the shortcomings that popularization and application.The present invention passes through examination
Conductive material, lead-out tablet, wire, data collecting system and the computer on part surface form power circuit, are sentenced by the break-make of circuit
The generation of disconnected face crack, the rule of development, have simple and easy, cost is cheap, high sensitivity, suitable for complex conditions, can be real
When monitoring, it is easy to utilize the characteristics of, to study Load materials mechanical characteristic, find pavement structure destruction source and road surface
It is significant that structure destroys preventing and treating.
Embodiment 2
Conductive silver glue of the present invention is completed according to following processing step：
It is first according to mass percent and prepares following raw material：
Flake silver powder 80%, organic resin 8%, diluent 6%, curing agent 4% and curing accelerator 2%；Therein
Shape silver powder is the flake silver powder that particle diameter is 0.1~4 μm, purity >=99.9%.Above-mentioned organic resin is polyacrylic resin, dilution
Agent is 2-Butoxyethyl acetate, and curing agent is 1-cyanoethyl-2-phenylimidazole, curing accelerator 4,4- diaminobenzene methyl
Imidazoles.
The preparation method of curing conductive elargol is as follows：
1) it is 0.1~4 μm to weigh particle diameter by mass percentage first, and the flake silver powder of purity >=99.9% is stand-by；
2) organic resin and diluent are weighed by foregoing mass percent, is heated under the conditions of 60 DEG C, treat that resin is completely molten
It is stand-by that room temperature is cooled to after solution；
3) foregoing flake silver powder is added in the mixture of organic resin and diluent, adds curing agent and solidification promotees
Enter agent, mixed and crushed with colloid mill, control the rotating speed and run time of colloid mill, untill fineness is less than 5 μm
To curing conductive elargol finished product.
Gained curing conductive elargol product after testing and pitch test material elongation percentage deviation be less than 0.1%；And
In the detection application of more than 500 times, there is not the situation in generation crack after conductive silver glue solidification.
Above to method provided by the present invention, it is described in detail, specific case used herein is to the present invention
Principle and embodiment be set forth, the explanation of above example is only intended to help the method and its core that understand the present invention
Thought is thought；Meanwhile for those of ordinary skill in the art, according to the thought of the present invention, in embodiment and using model
There will be changes are placed, in summary, this specification content should not be construed as limiting the invention.
Claims (5)
1. a kind of asphalt face crack monitoring method, comprises the following steps：
S100, surface of test piece are handled, and its surface is kept smooth, closely knit；
S200, a kind of elongation percentage of selection and conductive material similar in test specimen, the surface of test specimen, shape are equably applied to by groove
Into the not loop of conduction, wherein, conductive material is uniformly applied to cylinder inside and outside test specimen by the groove that width is 0.6mm
Surface high 20mm, 40mm, 60mm, 80mm position, form multiple first and do not close galvanic circle, meanwhile, in test specimen upper surface
Conductive material is smeared between internal diameter and external diameter, forms the second galvanic circle do not closed；The conductive material is curing conductive silver
Glue, its constituent are flake silver powder 80%, organic resin 8%, diluent 6%, curing agent 4% and curing accelerator 2%；Its
In flake silver powder be flake silver powder that particle diameter is 0.1~4 μm, purity >=99.9%, the preparation method of curing conductive elargol is such as
Under：1) it is 0.1~4 μm to weigh particle diameter by mass percentage first, and the flake silver powder of purity >=99.9% is stand-by；2) by foregoing
Mass percent weighs organic resin and diluent, is heated under the conditions of 60 DEG C, being cooled to room temperature after resin is completely dissolved treats
With；3) foregoing flake silver powder is added in the mixture of organic resin and diluent, adds curing agent and curing accelerator,
Mixed and crushed with colloid mill, control the rotating speed and run time of colloid mill, solidified untill fineness is less than 5 μm
Conductive silver glue finished product；
S300, form galvanic circle；Lead-out tablet is placed on to the both ends for not closing galvanic circle, respectively with the conductive material shape
Into do not close galvanic circle and access data acquisition device and computer after connect with wire, formation galvanic circle；
S400, the connected state for checking galvanic circle, data acquisition device and computer are opened, checks whether circuit is in connected state
State；If being in connected state, can be tested；Otherwise, galvanic circle is checked, untill circuit is in connected state；
The temperature control box inside holding 6 hours of S500, test specimen at 15 DEG C, and in the assembling of test specimen inner chamber the after-applied 0.5MPa of air bag perseverance
Determine air pressure, test specimen is tested, if crack occurs in surface of test piece, galvanic circle will be switched off, and connect the electricity of data acquisition device
Brain will time that accurately real-time writing circuit disconnects, the time is the cracking time of surface of test piece, so as to realize to examination
The real-time monitoring of part face crack.
2. monitoring method according to claim 1, it is characterised in that in S100, the preparation method of the test specimen is as follows：
Static pressure or a diameter of 100mm of gyratory compaction molding, a height of 100mm asphalt cylinder, then the pitch is mixed
It is 100mm to obtain overall diameter after material cylinder test specimen core boring sampling, interior diameter 20mm, and a height of 100mm asphalts are hollow
Cylinder test specimen；There is the base that width is 0.6mm periphery high 20mm, 40mm, 60mm, 80mm position inside and outside the test specimen
Directrix.
3. monitoring method according to claim 1, it is characterised in that the organic resin is polyacrylic resin, dilution
Agent is 2-Butoxyethyl acetate, and curing agent is 1-cyanoethyl-2-phenylimidazole.
4. monitoring method according to claim 1, it is characterised in that in S400, the data acquisition device has 16
Individual independent TCH test channel, each TCH test channel has independent power supply, and TCH test channel quantity can continue to extend.
5. monitoring method according to claim 1, it is characterised in that in S500, interior air bag is built into the test specimen,
Then vertical load is applied by MTS Material Testing Machine, loading velocity 2mm/min, test specimen inner surface is in plane tension and compression
Be compressed axially stress, until test specimen destroys.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105866006B (en) * | 2016-05-25 | 2019-02-15 | 中国石油天然气股份有限公司 | A kind of tight sand crack detecting device and method |
| CN107894445A (en) * | 2017-10-30 | 2018-04-10 | 江阴市恒润重工股份有限公司 | A kind of flange available for end face of flange crack monitoring |
| CN107907409B (en) * | 2017-11-10 | 2023-01-03 | 中国地质大学（武汉） | Method, equipment and storage equipment for determining rock cracking stress |
| CN113447388A (en) * | 2021-06-29 | 2021-09-28 | 重庆市潼南区九橡化大环保科技有限公司 | Asphalt ductility instrument calibration test piece and preparation method and calibration method thereof |
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| ES2149045A1 (en) * | 1995-12-21 | 2000-10-16 | Univ Catalunya Politecnica | Direct traction test procedure applied to the characterisation of bituminous mixtures |
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