CN110174324A - The solidifying white depth in porous asphalt mixture surface and unhomogeneity of deformation test device and method - Google Patents
The solidifying white depth in porous asphalt mixture surface and unhomogeneity of deformation test device and method Download PDFInfo
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- G—PHYSICS
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- G01B15/00—Measuring arrangements characterised by the use of electromagnetic waves or particle radiation, e.g. by the use of microwaves, X-rays, gamma rays or electrons
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- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B15/00—Measuring arrangements characterised by the use of electromagnetic waves or particle radiation, e.g. by the use of microwaves, X-rays, gamma rays or electrons
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- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/26—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring depth
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- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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Abstract
The invention discloses a kind of solidifying white depth in porous asphalt mixture surface and unhomogeneity of deformation test device and method, test device include organic glass system at cylindrical vessel, atomizer, temperature and humidity controller, strain testing instrument and CT scanner.Porous asphalt mixture marshal piece is scanned using CT scanner first, reconstruct obtains test piece three-dimensional model, then multiple resistance strain gages are circumferentially pasted in test specimen side, test specimen is put into cylindrical vessel and cylindrical vessel is put into refrigerator, then the aqueous vapor by atomizer atomization imports in cylindrical vessel, make in cylindrical vessel moisture stable between 96% ~ 98% using temperature and humidity controller, it is read using strain testing instrument acquisition resistance strain gage, it calculates nonuniformity coefficient and evaluates porous asphalt mixture unhomogeneity of deformation, test specimen and reconstruction model are finally scanned again, solidifying white depth is measured using Boolean calculation.The present invention being capable of the solidifying white depth in quantitative assessment porous asphalt mixture surface and unhomogeneity of deformation.
Description
Technical field
The invention belongs to porous asphalt pavement anti-freezing properties to evaluate field, and in particular to a kind of porous asphalt mixture surface
The test device and method of solidifying frost depth and unhomogeneity of deformation.
Background technique
With the popularization and application of porous asphalt pavement, the functions such as draining, noise reduction, antiskid, anti-dazzle and decontamination are being realized
Meanwhile also there are many problems, other than the damage such as common pore plugging, loose, night temperature is reduced, and air accommodates
Saturated water tolerance decline, extra aqueous vapor be attached to porous pavements surface condensation frosts, since road surface is porous, road table temperature compared with
It is low, it coagulates frost amount often very greatly, even will appear road table " black ice " in low temperature and high relative humidity area, it is serious to reduce road table antiskid performance, pole
Traffic accident is easily induced, serious life and property loss is caused.As it can be seen that solidifying frost and ice jelly is the mixing of low temperature and high relative humidity area porous asphalt
Expect the significant obstacle of application.
The problem of around porous asphalt mixture frost damage, road worker is in mixture early stage frost heave stress in recent years
Mixture performance attenuation law etc. has carried out a series of grind after test, the indoor simulation method of Frozen-thawed cycled process, freeze thawing
Study carefully, achieve some achievements, generally believe at present: volume expansion when mixture internal void water-setting ice, pore wall is by ice
Frost heave compression, if mixture suffers restraints, this compression cannot be released effectively and dissipate, then in entire mixture structure
Inside generates frost heave stress, and frost heave is caused to be damaged, and causes porous mixture freeze-thaw durability insufficient.
Unlike frost inside mixture: frost heave caused by frost is damaged mainly in mix surface and top hole
Occur, mixture lower part is then endured cold contractions, and deformation is unevenly up and down.And not yet carry out the solidifying frost in porous asphalt mixture surface at present
Research, deformation/stress uniformity caused by the depth condensed in porous mixture hole for frost, the solidifying frost in surface etc. is still not
It is clear.Therefore, designing one kind, simply, efficiently method carries out the solidifying white depth in porous asphalt mixture surface and unhomogeneity of deformation
Test, for it is deep understanding and accurate assurance porous asphalt mixture frost damage substantive characteristics, improve porous asphalt mixing
Expect that there is important value in the popularization and application of high Humid Area.
Summary of the invention
Lack the deficiency to the solidifying frost research in porous asphalt mixture surface for the prior art, the present invention provides a kind of porous
The test device and method of asphalt surface solidifying white depth and unhomogeneity of deformation, with the damage of quantitative assessment mixture frost
Degree.
In order to achieve the above-mentioned object of the invention, the invention adopts the following technical scheme:
According to an aspect of the present invention, a kind of solidifying white depth in porous asphalt mixture surface and unhomogeneity of deformation test fill
It sets, cylindrical vessel, atomizer, temperature and humidity controller, strain testing instrument and CT scanner including having top cover.
Cylindrical vessel for holding porous asphalt mixture marshal piece to be measured, cylindrical vessel barrel bottom, middle part and
Top is respectively arranged with the first circular hole, the second circular hole and third circular hole, and there are the 4th circular holes at cylindrical vessel top cap central, wherein
The position of second circular hole is higher than test specimen upper surface；The test specimen is circumferentially equidistantly pasted with multiple resistance-strains along it from top to bottom
Piece and its top be arranged with rubber seal, the rubber seal makes the gap shape between test specimen and cylindrical vessel barrel
At sealing, the multiple resistance strain gage is electrically connected by conducting wire with strain testing instrument, and the conducting wire is drawn from the first circular hole；Institute
It states the second circular hole and third circular hole is inserted with the temperature and humidity integral probe of temperature and humidity controller, temperature and humidity controller and atomization respectively
Device electrical connection, atomizer are connected to the 4th circular hole；
CT scanner is for scanning the marshal piece.
According to another aspect of the present invention, a kind of solidifying white depth in porous asphalt mixture surface and unhomogeneity of deformation are tested
Method, comprising the following steps:
Porous asphalt mixture marshal piece is formed, and is scanned using CT scanner, reconstruct obtains test piece three-dimensional model；
Multiple resistance strain gages are circumferentially equidistantly pasted from top to bottom in test specimen side；
The test specimen of adhering resistance strain sheets is placed under freezing conditions, is first stood at the first time, then from surface of test piece
Side imports aqueous vapor and guarantees that aqueous vapor is not imported from test specimen side and bottom surface simultaneously, and the humidity above surface of test piece is maintained at 96%
Between~98%, temperature be maintained at solidifying white two time of temperature control；
The strain that multiple resistance strain gages are detected using strain testing instrument records the reading of each resistance strain gage, by described
Reading calculates arithmetic mean of instantaneous valueAnd standard deviation sigma, then according to formulaNonuniformity coefficient k is calculated, to evaluate
The inhomogeneities of the solidifying frost deformation of test specimen；
The test specimen after coagulating frost is rescaned, test piece three-dimensional model obtains test specimen hole using Boolean calculation after the solidifying frost of reconstruct
Interior solidifying white three-dimensional structure and its depth.
It is further, described that aqueous vapor is imported above surface of test piece, specifically: using atomizer by aqueous vapor from surface of test piece
Top imports.
Further, the moisture stable above surface of test piece is maintained between 96%~98%, specifically: it utilizes warm and humid
Moisture stable above surface of test piece is maintained between 96%~98% by degree controller control atomizer.
Further, above-mentioned to be maintained at the moisture stable above surface of test piece using temperature and humidity controller control atomizer
Between 96%~98%, specifically: the humidity above the temperature and humidity controller monitoring surface of test piece, when humidity is lower than 96%
Atomizer is opened, closes atomizer when humidity is higher than 98%.
Preferably, the solidifying white temperature is -5 DEG C, and the first time is 0.5h, and the second time was 4h.
Preferably, the multiple resistance strain gage is pasted on test specimen side using water proof rubber glue.
Preferably, the size of the resistance strain gage is grid length 10mm × grid width 3mm.
Compared with prior art, the invention has the following advantages:
The present invention can analyze the solidifying white deformation process feature of porous asphalt mixture, and the solidifying frost of quantitative assessment mix surface is deep
The inhomogeneities that degree and mixture deform up and down, accurately holds porous asphalt mixture frost degree of injury, for low temperature and high relative humidity
The service performance of area's porous asphalt mixture provides evaluation index.
Detailed description of the invention
Fig. 1 is the cylindrical vessel schematic perspective view of the embodiment of the present invention；
Fig. 2 is that the solidifying white depth in the porous asphalt mixture surface of the embodiment of the present invention and unhomogeneity of deformation test device are tried
Test arrangement schematic diagram.
In figure, 1 porous asphalt mixture marshal piece；2 resistance strain gages；3O type rubber seal；4 temperature and humidity one
Probe；5 first circular holes；6 second circular holes；7 third circular holes；8 the 4th circular holes；9 cylindrical vessels.
Specific embodiment
The invention will be further described combined with specific embodiments below.Following embodiment is only used for clearly illustrating
Technical solution of the present invention, and not intended to limit the protection scope of the present invention.
(1) the solidifying frost critical issue in need of consideration in porous asphalt mixture surface
In order to simulate the solidifying white process of porous asphalt mixture, need to build the environment of a high humidity low temperature, therefore set
The simulator of meter allows for monitoring internal temperature and humidity, while needing to provide moisture and guaranteeing moisture stable.To solve this
Problem can be provided with two circular holes in device side, monitor different location temperature and humidity, it is ensured that not have humidity difference, while device
There are a circular holes on top to import aqueous vapor.Wherein, aqueous vapor can be provided by atomizer.It is being set for moisture stable in holding meanss
Determine in range, using the operation of temperature and humidity controller control atomizer, humidity automatically turns on atomizer when being lower than 96%, is higher than
Atomizer is closed when 98%.Device is integrally put in refrigerator, and setting cryogenic temperature just can build the environment of low temperature.In order to avoid water
Gap of the gas between compound test specimen and device wall is diffused into test specimen bottom, and it is close that when simulation covers a upper rubber at the top of test specimen
Seal.
The solidifying white process of porous asphalt mixture is: when temperature reduces, air accommodates the ability decline of aqueous vapor, extra aqueous vapor
It is reached inside mixture by the interconnected pore of porous asphalt mixture, on surface and internal condensate at frost.Condensation of moisture at
Frost, volume expansion can generate compression to pore wall, " be strutted " so as to cause porous asphalt mixture, not the ground of aqueous vapor
Square mixture is endured cold volume contraction, causes mixture deformation uneven.Therefore, frost is coagulated to adversely affect porous mixture bring
Not only to consider solidifying white depth, it is also necessary to consider performance degradation caused by unhomogeneity of deformation up and down.
In order to test solidifying white depth, a kind of simple and accurate method is to utilize Electronic Computer Tomography instrument
(abbreviation CT scanner) scans test specimen, since ice is different from interstitial air property, can obviously be obtained by scanning intrapore
Solidifying frost depth.And solidifying frost icing leads to the volume expansion of porous asphalt mixture outer profile or contraction of enduring cold, this volume change one
As it is smaller, and compound test specimen may be not identical in the deflection of different parts, and conventional method is caused to be difficult to directly measure
Variation of the sample dimensions before and after solidifying frost.By then can accurately measure different parts in mixture side adhering resistance strain sheets
Strain can be provided with a circular hole in bottom of device to export resistance strain gage conducting wire out of device.
(2) the solidifying white depth in porous asphalt mixture surface and unhomogeneity of deformation test device
As shown in Fig. 1 to 2, a kind of solidifying white depth in porous asphalt mixture surface and unhomogeneity of deformation test device, packet
Include cylindrical vessel 9, atomizer, temperature and humidity controller, strain testing instrument and CT scanner (being not drawn into figure).Wherein, cylinder holds
Device 9 is made of transparent organic glass.
Cylindrical vessel 9 is for holding porous asphalt mixture marshal piece 1 to be measured.9 internal diameter 120mm of cylindrical vessel, height
Spend 150mm, sealed bottom, top is equipped with top cover, and the barrel of top cover and cylindrical vessel 9 is connected through a screw thread, top cap central there are
The 4th circular hole 8 of diameter 20mm is to be passed through aqueous vapor.4th circular hole 8 is connected to by plastics sebific duct with atomizer.Cylindrical vessel 9
The second circular hole 6 and third circular hole 7 for offering diameter 10mm at barrel lateral distance bottom 85mm, 135mm respectively, facilitate insertion into
The temperature and humidity integral probe 4 of temperature and humidity controller is to measure the temperature and humidity of different location in cylindrical vessel 9.It is also opened in barrel bottom
There is the first circular hole 5 of a diameter 10mm, is used to extraction wire.
1 side of test specimen is circumferentially equidistantly pasted with 5 resistance strain gages 2 along it from top to bottom and its top is arranged
There is O-shaped rubber seal 3, it is close that the O-shaped rubber seal 3 forms the gap between 9 barrel of test specimen 1 and cylindrical vessel
Envelope, prevents aqueous vapor to be diffused into 1 bottom of test specimen from the gap between 9 barrel of test specimen 1 and cylindrical vessel.5 resistance strain gages 2
It is electrically connected by the conducting wire drawn from the first circular hole 5 with strain testing instrument.
The temperature and humidity controller is used to control the temperature in cylindrical vessel 9, and is electrically connected with atomizer to control cylinder
Humidity in container 9.
The CT scanner is for scanning the test specimen 1.
(3) the solidifying white depth in porous asphalt mixture surface and unhomogeneity of deformation test method
It is tested using above-mentioned (2) test device white depth solidifying to porous asphalt mixture surface with unhomogeneity of deformation
Method, comprising the following steps:
Step S1: molding porous asphalt mixture standard marshal piece 1 is scanned, and reconstruct examination using CT scanner
Part threedimensional model circumferentially pastes 5 pieces of resistance strain gages, resistance-strain sheet grating using adhesive from top to bottom in 1 side of test specimen
Long 10mm × grid width 3mm puts on the O-shaped rubber seal 3 of internal diameter 100mm, line footpath 10mm at the top of test specimen 1, test specimen 1 is put into circle
In cylinder container 9；Wherein, adhesive can be sealing water proof rubber glue, such as 704 silicon rubber；
Step S2: the conducting wire for connecting resistance strain gage 2 is drawn from 9 the first circular hole of bottom 5 of cylindrical vessel, is connected to static state
On strain testing instrument, the cylindrical vessel 9 containing test specimen 1 is put into refrigerator, -5 DEG C of set temperature, stands 0.5h；
Step S3: it is imported in cylindrical vessel 9 by the aqueous vapor that plastics sebific duct generates atomizer, passes through barrel side second
Circular hole 6 and third circular hole 7 protrude into the temperature and humidity integral probe 4 of temperature and humidity controller to monitor temperature and humidity in cylindrical vessel 9, wet
Temperature and humidity controller can automatically turn on atomizer when degree is lower than 96%, and atomizer can be closed when higher than 98%, moisture stable is made to exist
Between 96%~98%；
Step S4: after standing 4h, each resistance strain gage 2 of record strain testing instrument acquisition deforms reading, and it is flat to calculate arithmetic
Mean valueAnd standard deviation sigma, according to formulaNonuniformity coefficient k is calculated, is become to evaluate porous asphalt mixture frost
The inhomogeneities of shape；Test specimen 1 is taken out from cylindrical vessel 9, is rescaned, and test piece three-dimensional model after solidifying frost is reconstructed, using boolean
Operation obtains coagulating frost three-dimensional structure and its depth h in 1 hole of test specimen.
Embodiment
Illustrate porous asphalt mixture frost deformation test method under different humidity below by embodiment.In embodiment to
The porous asphalt mixture of evaluation is OGFC-13, and gradation, asphalt content BC, voidage VV are shown in Table 1.
The OGFC-13 that 1 embodiment of table uses
(1) test material preparation and instrument layout
Porous mixture marshal piece is formed by 1 gradation of table, stores demould afterwards for 24 hours at room temperature, utilize vernier caliper
Measuring porous mixture marshal piece diameter is 101.6mm, is highly 63.5mm.It is cured using Discovery CT750HD type
Test specimen is scanned with CT instrument, the image of scanning is imported into software Mimics, reconstructs test piece three-dimensional model.
Then the resistance strain gage 2 of 5 pieces of model BX120-5AA is equidistantly pasted onto test specimen side using 704 silicon rubber, electricity
Foil gauge 2 is hindered having a size of grid length 10mm × grid width 3mm, is stood 6h at 25 DEG C and is waited for 704 silicon rubber completion of cures, later on test specimen top
Portion puts on the O-shaped rubber seal 3 of internal diameter 100mm, line footpath 10mm.
It is careful not to damage resistance strain gage 2, then test specimen is put into cylindrical vessel 9, from 9 bottom first of cylindrical vessel
Circular hole 5 draws 2 conducting wire of resistance strain gage, is connected to DH-3818 static strain testing instrument, and setting tester sensitivity coefficient etc. is repaired
Positive parameter.
(2) frost is simulated
Cylindrical vessel 9 equipped with compound test specimen is put into temperature to be set as in -5 DEG C of refrigerator freezing room, stands 0.5h,
Then the temperature and humidity integral probe 4 of the imperial 668 type temperature and humidity controllers of shellfish is round from 9 the second circular hole of side 6 of cylindrical vessel and third
Hole 7 is protruded into container, is measured temperature at different height and is stable in -5 DEG C.
Using 402B type ultrasonic atomizer, the aqueous vapor of atomization is led from the 4th circular hole 8 of top into cylinder using plastics sebific duct
In container 9, humidifying mode is set by the imperial 668 type temperature and humidity controllers of shellfish, humidity is opened and is set to 96%, close humidity and be set to
98%, when temperature and humidity integral probe 4 detects humidity lower than 96%, controller can automatically turn on atomizer, when being higher than 98%
Controller can close atomizer, so that interior humidity be made to stablize between 96%~98%.
(3) data processing
After standing 4h, the deformation reading of each resistance strain gage 2 of record strain testing instrument acquisition, respectively -178 μ ε, -
312 μ ε, -365 μ ε, -348 μ ε, -362 μ ε, calculate deformation arithmetic mean of instantaneous valueSet criteria difference σ=78.15 μ
ε, according to formulaObtain nonuniformity coefficient k ≈ 0.216.
Test specimen is taken out from cylindrical vessel 9, rescans test specimen using Discovery CT750HD type Medical CT instrument, weight
Test piece three-dimensional model after the solidifying frost of structure obtains coagulating frost three-dimensional structure and its depth h=in test specimen hole using Boolean calculation
21.5mm。
The present invention is disclosed with preferred embodiment above, so it is not intended to limiting the invention, all to take equivalent replacement
Or the scheme technical solution obtained of equivalent transformation, it falls within the scope of protection of the present invention.
Claims (8)
1. a kind of solidifying white depth in porous asphalt mixture surface and unhomogeneity of deformation test device, which is characterized in that including band
There are cylindrical vessel, atomizer, temperature and humidity controller, strain testing instrument and the CT scanner of top cover,
Cylindrical vessel is for holding porous asphalt mixture marshal piece to be measured, cylindrical vessel barrel bottom, middle and top part
It is respectively arranged with the first circular hole, the second circular hole and third circular hole, there are the 4th circular holes at cylindrical vessel top cap central, wherein second
The position of circular hole is higher than test specimen upper surface；The test specimen is circumferentially equidistantly pasted with multiple resistance strain gages simultaneously along it from top to bottom
And its top is arranged with rubber seal, it is close that the rubber seal forms the gap between test specimen and cylindrical vessel barrel
Envelope, the multiple resistance strain gage are electrically connected by conducting wire with strain testing instrument, and the conducting wire is drawn from the first circular hole；Described
Two circular holes and third circular hole are inserted with the temperature and humidity integral probe of temperature and humidity controller, temperature and humidity controller and atomizer electricity respectively
Connection, atomizer are connected to the 4th circular hole；
CT scanner is for scanning the marshal piece.
2. a kind of solidifying white depth in porous asphalt mixture surface and unhomogeneity of deformation test method, which is characterized in that including with
Lower step:
Porous asphalt mixture marshal piece is formed, and is scanned using CT scanner, reconstruct obtains test piece three-dimensional model；
Multiple resistance strain gages are circumferentially equidistantly pasted from top to bottom in test specimen side；
The test specimen of adhering resistance strain sheets is placed under freezing conditions, first stands at the first time, is then led above surface of test piece
Enter aqueous vapor while guaranteeing that aqueous vapor is not imported from test specimen side and bottom surface, and the humidity above surface of test piece is maintained at 96%~
Between 98%, temperature be maintained at solidifying white two time of temperature control；
The strain that multiple resistance strain gages are detected using strain testing instrument records the reading of each resistance strain gage, by the reading
Calculate arithmetic mean of instantaneous valueAnd standard deviation sigma, then according to formulaNonuniformity coefficient k is calculated, to evaluate test specimen
The inhomogeneities of solidifying frost deformation；
Test specimen after rescaning solidifying frost reconstructs test piece three-dimensional model after solidifying frost, using Boolean calculation, obtains coagulating in test specimen hole
White three-dimensional structure and its depth.
3. the solidifying white depth in porous asphalt mixture surface according to claim 2 and unhomogeneity of deformation test method,
It is characterized in that, is imported aqueous vapor above surface of test piece using atomizer.
4. the solidifying white depth in porous asphalt mixture surface according to claim 3 and unhomogeneity of deformation test method,
Be characterized in that, using temperature and humidity controller control atomizer by the moisture stable above surface of test piece be maintained at 96%~98% it
Between.
5. the solidifying white depth in porous asphalt mixture surface according to claim 4 and unhomogeneity of deformation test method,
It being characterized in that, the humidity above the temperature and humidity controller monitoring surface of test piece opens atomizer when humidity is lower than 96%, when
Humidity closes atomizer when being higher than 98%.
6. the solidifying white depth in porous asphalt mixture surface according to claim 2 and unhomogeneity of deformation test method,
It is characterized in that, the solidifying white temperature is -5 DEG C, and the first time is 0.5h, and the second time was 4h.
7. the solidifying white depth in porous asphalt mixture surface according to claim 2 and unhomogeneity of deformation test method,
It is characterized in that, multiple resistance strain gages are pasted on test specimen side using water proof rubber glue.
8. the solidifying white depth in porous asphalt mixture surface according to claim 2 and unhomogeneity of deformation test method,
It is characterized in that, the size of the resistance strain gage is grid length 10mm × grid width 3mm.
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| CN113432830A (en) * | 2021-07-19 | 2021-09-24 | 无锡威孚力达催化净化器有限责任公司 | Simulation test device and method for diesel engine DPF soot trapping uniformity |
| 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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