CN109765103A - A kind of asphalt particle marker and method for tracing - Google Patents
A kind of asphalt particle marker and method for tracing Download PDFInfo
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Abstract
The invention discloses a kind of asphalt particle marker and method for tracing, comprising the following steps: mixing asphalt, and marking particle is placed in shaping test piece in asphalt；Gyratory compaction test is carried out to shaping test piece, scans test specimen after the test, acquires faultage image, three-dimensionalreconstruction is carried out to test specimen；The transfer parameter of marking particle is calculated according to the three dimensional space coordinate obtained after three-dimensionalreconstruction.The present invention is tracked the particle migration in mixture compacting process by marking particle, pass through CT scan and image processing techniques, the spatial position of the pointer of marking particle and the variation of state are quantified in conjunction with Image-pro premier and MATLAB software, analyze the particle migration rule in its compacting process, obtaining data more has authenticity, facilitates the design and analysis for promoting asphalt and performance prediction is horizontal.
Description
Technical field
The invention belongs to technical field of road engineering, and in particular to a kind of asphalt particle marker and method for tracing.
Background technique
Asphalt is made of mineral aggregate, asphalt binder and gap, the graininess composite material with multiphase feature.
The contact of mineral aggregate particle, the bonding of friction and pitch, lubricating effect are coupled, and form mineral aggregate/asphalt system complexity interface
Effect.Under the comprehensive function of traffic load and external environment, mineral aggregate particle is in slow transition state, and interfacial effect is continuous
Damage, accumulation, to generate the pavement diseases such as serious track, passage.As it can be seen that under extraneous conditioning, granular system hair
Raw migration self-organizing behavior, to reach new equilibrium state or failure.Therefore, the migration characteristic of mineral aggregate is largely determined
Determine the mechanical response and decay process of mixture, and then is related to pavement disease and durability.
With the development of computer technology, the migration row of particle in asphalt compacting process is probed into from fine sight level
To be possibly realized.Wu Wenliang moves shape to the particle during asphalt track plate actual tests using image processing techniques
Condition is studied, but has been carried out cutting recombinant to test specimen and be further applied load again, may so be moved and be produced to the particle of test specimen
Raw certain influence.The stream of Ehsan Ghafoori Roozbahany aggregate particle in Research on Asphalt Mixture compacting process
When dynamic property, regular stratum paving screw is as mark in the device of exploitation, before being compacted to compacting process and after compacting
CT scan twice, it is for statistical analysis to the spatial position change and change in location orientation of compacting front and back screw, to disclose drip
Mobility of particle in green mixture compacting process.But this mode is for statistical analysis to screw, although certain
Can reflect out the stress and mobility of asphalt aggregate particle in compacting process in degree, but after all with aggregate particle
Physical property it is too wide in the gap, the limitation of research is too big, cannot really restore the migration characteristic of aggregate particle.
Based on this, the present invention proposes a kind of asphalt particle marker and method for tracing, exists to probe into asphalt
The migratory behaviour of particle in compacting process, to further disclose the compacting mechanism of asphalt.
Summary of the invention
The present invention provides a kind of asphalt particle marker and method for tracing, disclose asphalt and are being compacted
Migratory behaviour in journey.
The present invention provides a kind of asphalt particle marker and method for tracing, comprising the following steps:
S1, mixing asphalt, and marking particle is placed in shaping test piece in asphalt；
Wherein, marking particle is the aggregate particle for inlaying iron wire and the aggregate particle for wrapping reduced iron powder, inlays iron wire
Iron wire in aggregate particle is known as pointer；
The maximum particle diameter for wrapping the aggregate particle of reduced iron powder is known as main shaft；
S2 carries out gyratory compaction test to shaping test piece in S1, scans test specimen after the test, acquires faultage image, right
Test specimen carries out three-dimensionalreconstruction；
S3 calculates the transfer parameter of marking particle according to the three dimensional space coordinate obtained after three-dimensionalreconstruction in S2；
Transfer parameter includes rolling parameters and space transfer parameter, and rolling parameters include: the spatial rotational angle of marking particle
Spend α, the angle α of marking particle and X-axisΔx, the angle α of marking particle and Y-axisΔy, the angle α of marking particle and Z axisΔz；
Space transfer parameter includes: displacement L of the marking particle in X axisX, displacement L of the marking particle in Y-axisy,
The displacement L of marking particle in the horizontal planexoy, marking particle migration value L straight downZ, marking particle is displaced dynamic straight down
Relative valueCircular is as follows:
S3.1, the calculating of rolling parameters
In three-dimensional coordinate system, before compacting, an extreme coordinates A (x of a certain " vector " is measureda, ya, za) and it is another
An outer extreme coordinates B (xb, yb, zb), then the coordinate of vector isCompacting
In the process, marking particle migrates, and " vector " variation, A point moves to C point, and B point moves to D point, measures C (xc, yc, zc) and
D(xd, yd, zd), then the coordinate of vector is after migratingCarry out such as down conversion:
ThenVector space corner is the angle α of two vectors,
Its cosine value are as follows:
By cosine function of negating, the spatial rotational angle [alpha] of pointer, main shaft in compacting process is acquired, according to formula (3),
The angle of pointer and main shaft and X, Y, Z axis under different number of machine passes is acquired, and then is inferred to pointer and main shaft in compacting process
With the variation α of reference axis angleΔx、αΔy、αΔz；
S3.2, the calculating of space transfer parameter
In formula: Δ h is height of specimen changing value after test specimen compacting.
Preferably, to test specimen progress three-dimensionalreconstruction, specific step is as follows in S2: at collected faultage image
Reason, obtains the two-dimensional coordinate of target point, is obtained by tomography present position along axial coordinate, the two is combined and obtained inside test specimen
The three dimensional space coordinate of any point.
Preferably, collected faultage image is handled using Image-pro premier and MATLAB software, is obtained
Take the three dimensional space coordinate of any point inside test specimen.
Preferably, the three dimensional space coordinate of pointer is obtained using Image-pro premier method particularly includes: use
Image-pro premier to along Z axis to wherein a certain tension fault image handle, set the picture lower left corner as coordinate original
Point is vertically space Y axis, is laterally space X axis, reads iron wire in the faultage image by Image-pro premier
(x, y), the value that software is read are pixel value, and a pixel value corresponds to 0.134mm, the coordinate being eventually converted into as unit of mm
Value；Z axis is numbered to all tomography pictures, it is assumed that the tomography number that internal inlayed iron wire occurs that gathers materials is n, then its institute
The Z axis coordinate at place are as follows: (n-1) * 0.134mm.
Compared with prior art, the beneficial effects of the present invention are:
The particle for the 19.0mm partial size that the present invention is inlaid with iron wire by inside wraps reduced iron powder with external
The particle of 13.2mm partial size is tracked the particle migration in mixture compacting process, passes through CT scan and image procossing skill
Art, in conjunction with Image-pro premier and MATLAB software to the variation of the spatial position of the pointer of marking particle and state into
Row quantization, analyze in its compacting process particle migration rule, relative to other by CT scan test specimen obtain two dimensional image or
Person is based on two dimensional image realization three-dimensionalreconstruction and obtaining data more has authenticity, helps to promote setting for asphalt
Meter, analysis and performance prediction are horizontal.
Detailed description of the invention
Fig. 1 is the marking particle inlayed before and after iron wire in embodiment 1, wherein figure (A) is to inlay the marking particle before iron wire,
Scheming (B) is to inlay the marking particle after iron wire；
Fig. 2 is the marking particle wrapped up in front of and after attached iron powder in embodiment 1, and wherein A is the marking particle wrapped up in front of attached iron powder, and B is
Marking particle after wrapping up in attached iron powder；
Fig. 3 is the CT scan effect picture of two kinds of marking particles in embodiment 1, wherein figure (A) is to inlay the label after iron wire
Particle, figure (B) is to wrap up in the marking particle after attached iron powder；
Fig. 4 is CT scan space coordinate origin calibration figure in embodiment 1；
Fig. 5 is that CT scan acquires image after gyratory compaction in embodiment 1, and the figure of figure acceptance of the bid three-dimensionalreconstruction is three to test specimen
Reconstruct image is tieed up, the figure of excess-three mark Z, X, Y are the allusion quotation of the faultage image of the interval 0.134mm carried out along Z, X, Y-direction respectively
Pattern；
Fig. 6 is that MATLAB calculates main shaft image in embodiment 1.
Specific embodiment
In order to enable those skilled in the art to more fully understand, technical solution of the present invention is practiced, below with reference to specific
The invention will be further described for embodiment and attached drawing, but illustrated embodiment is not as a limitation of the invention.
Embodiment 1
A kind of asphalt particle marker and method for tracing, comprising the following steps:
S1, mixing asphalt, and marking particle is placed in shaping test piece in asphalt, test specimen diameter after molding
For 100mm, design height 115mm；
S1.1, mixing asphalt
Test uses Zhonghai 36-1 matrix pitch, referring to " highway engineering pitch and Asphalt Mixture Experiment regulation (JTJ
052-2000) " related request is detected, and the fundamental property of the matrix pitch is as shown in table 1.Test uses Shaanxi somewhere lime
Rock, miberal powder select levigate limestone, according to regulation in " highway engineering is gathered materials testing regulations (JTG E42-2005) " to thick, thin
The key technical indexes gathered materials is measured, by experimental test, recording materials relevant art index, as shown in Table 2,3.Mixing
AC-20 asphalt, mineral aggregate gradation used is as shown in table 4, and optimum oil-stone ratio is determined using marshall' mechanic characteristic value, is
4.0%, compacting temperature is 140 DEG C.
1 pitch fundamental property of table
Table 2 is thick, fine aggregate the key technical indexes
3 miberal powder the key technical indexes of table
4 mixture gradation of table
S1.2, the selection and production of marking particle
The principle that marking particle is chosen: the intrinsic geometrical property that ensure to gather materials when (1) choosing marking particle does not change；
(2) do not change the gradation composition of asphalt because of the incorporation of marking particle；(3) image of the marking particle after CT scan
In can be distinguished with common asphalt particle, play the recognition reaction of marking particle.
Based on above-mentioned selection principle, we choose the aggregate particle conduct that the aggregate particle for being inlaid with iron wire and iron powder wrap
Marking particle, be inlaid with the marking particle of iron wire the preparation method is as follows:
Corresponding iron wire length is drilled through on the aggregate particle surface that two variform partial sizes are 19.0mm using electric drill
Thermosetting epoxy resin is injected in hole into hole, is then inlaid into iron wire in hole securely, is denoted as 1# and 2# particle respectively, such as
Shown in Fig. 1.
The marking particle that iron powder wraps the preparation method is as follows:
Epoxy resin is smeared on the aggregate particle surface that two shape different-grain diameters are 13.2mm, it is then that reduced iron powder is equal
It is even to be applied to aggregate particle surface, it is denoted as 3# and 4# particle respectively, effect is as shown in Figure 2.
Effect of two kinds of marking particles in the image that CT scan obtains is wrapped up in as shown in figure 3, the effect of iron wire is fairly obvious
The aggregate particle surrounding for covering iron powder has white sideband, is also easy to distinguish.
Convenient in order to describe in calculating process, the iron wire in the aggregate particle for inlaying iron wire is known as pointer by us；It wraps up in
A unique maximum value existing for the aggregate particle surface any point to the surface in addition distance of any of reduced iron powder is covered to be known as
The main shaft of this aggregate particle.
Marking particle is placed in shaping test piece in asphalt by S1.3
Four marking particles and other mineral aggregates are mixed into common mixing AC-20 asphalt, are formed using SGC
Test specimen is demoulded after test specimen is cooled to room temperature.
S2 carries out gyratory compaction test to shaping test piece in S1, scans test specimen after the test, acquires faultage image, right
Test specimen carries out three-dimensionalreconstruction, and detailed process is as follows:
Collected faultage image is handled using Image-pro premier and MATLAB software, obtains target
The two-dimensional coordinate of point, specific image processing process are as follows:
The pointer of 1#, 2# particle is directly acquired its extreme coordinates using image processing software, then passes through
MATLAB programming, program is run after extreme coordinates are inputted can be obtained transfer parameter, but the main shaft of particle is then needed to borrow
MATLAB is helped to be calculated.
It is handled using target particles of the Image-pro premier to a tension fault picture, so that particle viewing area
Gray value in domain is 0, does not change the gray value in remaining place, as shown in Figure 6.It is programmed using MATLAB just for white in Fig. 6
Grain edges all pixels point in color rectangle frame is counted, then successively to all tomoscan images comprising the particle
It is similarly handled, the space coordinate of the nearly all point in the marking particle surface can be obtained in this way, it will using MATLAB
The distance of any two points is compared in the set of all the points, and obtaining maximum value is the master in the spatial sense of the marking particle
Axis, and export the space coordinate of two endpoints of the main shaft.
It is obtained by tomography present position along axial coordinate, the two, which combines, obtains the three-dimensional space of any point inside test specimen
Coordinate.Come to test specimen for obtaining the specific method of three dimensional space coordinate of pointer using Image-pro premier software
Three-dimensionalreconstruction is illustrated: using Image-pro premier to along Z axis to wherein a certain tension fault image handle,
The picture lower left corner is set as coordinate origin, is vertically space Y axis, is laterally space X axis, is read by Image-pro premier
(x, y) of the iron wire in the faultage image is taken, the value that software is read is pixel value, and a pixel value corresponds to 0.134mm, final to turn
Turn to the coordinate value as unit of mm；Z axis is numbered to all tomography pictures, it is assumed that internal the inlayed iron wire that gathers materials goes out
Existing tomography number is n, then the Z axis coordinate locating for it are as follows: (n-1) * 0.134mm.
After carrying out gyratory compaction to test specimen, each scanning is handled using unified calibration, it is ensured that test specimen space is sat
Mark origin position do not change, test specimen relative to space coordinate origin calibration as shown in figure 4, test specimen relative to space sit
The position for marking origin is constant, and test specimen internal particle has unique corresponding space coordinate relative to coordinate origin at each moment,
By tracking the space coordinate variation of a certain partial size grade particles, to study migration of the marking particle in compacting process.
Test specimen is placed on turntable, and the radiographic source on right side radiates cone-beam x-ray through test specimen, the decay situation of ray
Received by the detector in left side, by computer information processing and image reconstruction technique can precise restoration test specimen tomograph
Picture, when tomography spacing is sufficiently small and faultage image is enough, so that it may realize the three-dimensionalreconstruction of test specimen.Fig. 5 is gyratory compaction
The image that CT scan obtains is carried out afterwards, and the lower right corner is the three-dimensionalreconstruction to test specimen in figure, and excess-three is along Z, X, Y-direction respectively
The typical specimen page of the faultage image of the interval 0.134mm of progress.
S3, computation migration parameter
Transfer parameter includes rolling parameters and space transfer parameter, and rolling parameters include: the spatial rotational angle of marking particle
Spend α, the angle α of marking particle and X-axisΔx, the angle α of marking particle and Y-axisΔy, the angle α of marking particle and Z axisΔz；Space
Transfer parameter includes: displacement L of the marking particle in X axisX, displacement L of the marking particle in Y-axisy, marking particle is in water
Displacement L in planexoy, marking particle migration value L straight downZ, relative value that marking particle is displaced straight down
S3.1, the calculating of rolling parameters
Before compacting, an extreme coordinates A (x of a certain " vector " is measureda, ya, za) and another extreme coordinates B (xb,
yb, zb), then the coordinate of vector is
In compacting process, A point moves to C point, and B point moves to D point, measures C (xc, yc, zc) and D (xd, yd, zd), migration
The coordinate of vector is afterwardsCarry out such as down conversion:
ThenVector space corner is the angle of two vectors
α, cosine value are as follows:
By cosine function of negating, the spatial rotational angle [alpha] of pointer, main shaft in compacting process is acquired, according to formula (3),
Acquire the angle of pointer and main shaft and X, Y, Z axis under different number of machine passes, so find out in compacting process pointer and main shaft with
The variation α of reference axis angleΔx、αΔy、αΔz；
S3.2, the calculating of space transfer parameter
Wherein, Δ h is height of specimen changing value after test specimen compacting.
The index of the tomoscan image of three axial directions is substituted into formula (1)-(8) to calculate, and calculated result is carried out
Compare, obtains data as shown in table 5 after being averaged processing.
5 marking particle of table tracks result
As can be seen from Table 5, marking particle can accurately be calculated in compacting process using method of the invention
Transfer parameter, facilitates the design and analysis for promoting asphalt and performance prediction is horizontal.
The present invention describes preferred embodiment, and once a person skilled in the art knows basic creative general
It reads, then additional changes and modifications may be made to these embodiments.So it includes preferred real that the following claims are intended to be interpreted as
It applies example and falls into all change and modification of the scope of the invention.
Obviously, various changes and modifications can be made to the invention without departing from essence of the invention by those skilled in the art
Mind and range.In this way, if these modifications and changes of the present invention belongs to the range of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to include these modifications and variations.
Claims (3)
1. a kind of asphalt particle marker and method for tracing, which is characterized in that include the following steps,
S1, mixing asphalt, and marking particle is placed in shaping test piece in asphalt；
Wherein, marking particle is the aggregate particle for inlaying iron wire and the aggregate particle for wrapping reduced iron powder, inlays the label of iron wire
Iron wire in particle is known as pointer；
The maximum particle diameter for wrapping the marking particle of reduced iron powder is known as main shaft；
S2 carries out gyratory compaction test to shaping test piece in S1, scans test specimen after the test, faultage image acquired, to test specimen
Carry out three-dimensionalreconstruction；
S3 calculates the transfer parameter of marking particle according to the three dimensional space coordinate obtained after three-dimensionalreconstruction in S2；
Transfer parameter includes rolling parameters and space transfer parameter, and rolling parameters include: the spatial rotational angle [alpha] of marking particle,
The angle α of marking particle and X-axisΔx, the angle α of marking particle and Y-axisΔy, the angle α of marking particle and Z axisΔz；
Space transfer parameter includes: displacement L of the marking particle in X axisX, displacement L of the marking particle in Y-axisy, label
The displacement L of particle in the horizontal planexoy, marking particle migration value L straight downZ, marking particle is displaced opposite straight down
ValueCircular is as follows:
S3.1, the calculating of rolling parameters
Before compacting, an extreme coordinates A (x of a certain " vector " is measureda, ya, za) and another extreme coordinates B (xb, yb,
zb), then the coordinate of vector is
In compacting process, A point moves to C point, and B point moves to D point, measures C (xc, yc, zc) and D (xd, yd, zd), migration is backward
The coordinate of amount isCarry out such as down conversion:
ThenThe angle of two vectors is α, cosine value are as follows:
By cosine function of negating, acquires the spatial rotational angle [alpha] of pointer, main shaft in compacting process and acquired according to formula (3)
The angle of pointer and main shaft and X, Y, Z axis under different number of machine passes, and then find out pointer and main shaft and coordinate in compacting process
The variation α at axle clamp angleΔx、αΔy、αΔz；
S3.2, the calculating of space transfer parameter
Wherein, Δ h is height of specimen changing value after test specimen compacting.
2. asphalt particle marker according to claim 1 and method for tracing, which is characterized in that in S2 to test specimen into
Specific step is as follows for row three-dimensionalreconstruction: handling collected faultage image, obtains the two-dimensional coordinate of target point, pass through
Tomography present position is obtained along axial coordinate, and the two, which combines, obtains the three dimensional space coordinate of any point inside test specimen.
3. asphalt particle marker according to claim 2 and method for tracing, which is characterized in that use Image-
Pro premier and MATLAB software handle collected faultage image, obtain the three-dimensional space of any point inside test specimen
Between coordinate.
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Cited By (1)
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| CN111028355A (en) * | 2019-11-13 | 2020-04-17 | 武汉科技大学 | Three-dimensional model reconstruction method for asphalt mixture |
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Application publication date: 20190517 |