CN107202877B - A kind of bridge asphalt pavement bulge forms indoor simulation experimental rig and method - Google Patents
A kind of bridge asphalt pavement bulge forms indoor simulation experimental rig and method Download PDFInfo
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- CN107202877B CN107202877B CN201710539095.8A CN201710539095A CN107202877B CN 107202877 B CN107202877 B CN 107202877B CN 201710539095 A CN201710539095 A CN 201710539095A CN 107202877 B CN107202877 B CN 107202877B
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Abstract
The invention discloses a kind of bridge asphalt pavement bulges to form indoor simulation experimental rig and method, purpose is, record bridge deck pavement bulge form changes with time feature, it obtains bulge characteristic feature parameter vertical deflection, unsticking radius, the influence factor for analyzing bulge formation, the different pave-load layers of evaluation and resists bulge ability, and as subsequent finite element modelling certificate parameter, used technical solution are as follows: experimental rig mainly includes the components such as support frame, environmental cabinet, test specimen fixed frame and MTI-3D malformation measuring system.Experimentation includes test material preparation, test specimen installation, experimental enviroment setting and bulge whole audience displacement measurement.It can speeding-up simulation different type bridge deck pavement material bulge disease generating process in construction and operation using the present invention, overall process records bulge development form, bulge is obtained in the displacement of the different phase whole audience and strain characteristics, is of great significance for probing into the major influence factors of bulge formation and disclosing bulge formation mechenism.
Description
Technical field
The invention belongs to bridge asphalt pavement disease prevention techniques fields, and in particular to a kind of bridge asphalt pavement bulge shape
At simulation laboratory test device and method.
Background technique
Expressway construction is to mountain development in recent years, and bridge proportion in route is continuously increased, to deck paving
The prevention of disease also becomes more important with processing.With application of the new materials such as epoxy asphalt mixture in deck paving,
Crack and permanent deformation disease gradually decrease, and bulge but has become the most important Damage Types of deck paving, causes people
Extensive concern.Deck paving generally includes water-proof tack coat on floorings, mat formation lower layer and upper layer of mating formation.It is mixed between each layer
After entering air or moisture, the heated volume expansion of the gas being enclosed in pave-load layer in summer high temperature forms huge expansive force, by
Gradually pave-load layer is jacked up and forms bulge phenomenon.Bridge floor is during operation between pave-load layer and waterproof layer or waterproof layer and bridge
It is likely to form bulge disease between panel, and bulge disease is in work progress with the most normal between waterproof layer and floorings
See.
When bulge disease occurs in deck paving, layers of material is bent during heaving and stretching action, holds very much
It is also easy to produce microcrack, further under the repeated action of dynamic vehicle load and weather, layer surface of mating formation will generate a large amount of purt mud
Whiting slurry phenomenon, just loses bridge floor cohesive force, is gradually crushed under Driving Loading, most after deck paving is heaved in addition
Cause pave-load layer to collapse eventually, and causes extensive damage.More seriously, after bulge generates crack, moisture can be by splitting
Seam is directly contacted with floorings, accelerates the corrosion or corrosion to bridge, this has not only seriously affected making for deck installation structure
With the globality and flatness in service life and deck paving, security risk is even more increased, is unfavorable for the safety of driving and comfortable
Property.
So currently urgently needing observing to bulge forming process, its morphological feature parameter is obtained, with clear
The influence factor and failure mode that bulge is formed, so that the related measure for being effectively prevented the generation of bulge disease is proposed, for referring to
Lead deck installation structure, design of material and construction.From this, being sent out using on-site test or the method for test simulation bulge
Exhibition process morphological feature is observed, and is evaluated the ability that different pavement materials resist bulge formation under different operating conditions, is become one
The problem of a urgent need to resolve.However live bridge floor bulge disease, the often comprehensive function of various aspects factor directly carry out scene
Detection is difficult to carry out with analysis, there are larger difficulty, while bridge floor bulge is the process slowly developed, and the initial stage becomes
Shape is smaller, belongs to and is difficult to observe by implicit type disease.Based on this, just seems to the forming process progress indoor simulation of bulge and very must
It wants.
Current China is in bridge deck pavement material bulge disease simulation test device and test method field also in blank, state
Although developing some analogy methods for bridge floor or the forming process of ground surface material bulge outside, these experimental provisions and test
All there are some problems for method: load is manually set and forms bulge to simulate the effect of pavement material internal gas, but is this
Its loading mode of the mechanical load artificially controlled acts on excessively single simplification, contraction of gas expansion week compared to actual gas expansion
The present experimental provision of the effect of being acted upon by temperature changes is difficult to simulate simultaneously for phase and material property, the destruction of material bulge
Form is to have very large deviation with actual conditions in the case where medium pressurizes or axis is loaded；Most importantly current mechanical load method will rouse
The suffered artificial load of effect of packet forming process, and in actual conditions pave-load layer internal moisture number, floorings dry and wet shape
Condition, pavement material voidage may have an important influence on actual loading, and the influence of these key factors is directly closed
To the guidance to design, work progress, but current mechanical load analogy method is difficult to be related to.It can so needing one kind
Simulate bridge deck pavement material bulge forming process to greatest extent, the true experimental method for reflecting the expansion of bulge internal gas and
Device.
Summary of the invention
In order to solve the problems in the prior art, the present invention proposes that one kind is able to record bridge deck pavement bulge development process
Morphological change characteristics can be used in analyzing the influence factor that bulge is formed, can evaluate different paving structure layers and resist bulge energy
The bridge asphalt pavement bulge of power forms indoor simulation experimental rig and method.
In order to achieve the goal above, the technical scheme adopted by the invention is as follows:
A kind of bridge asphalt pavement bulge forms indoor simulation experimental rig, including support frame, is fixedly installed on support frame
There is environmental cabinet, the test specimen fixed frame for placing test specimen is provided in environmental cabinet, is provided on environmental cabinet for adjusting temperature and humidity
The temperature and humidity of environment generates controller, and the environmental cabinet upper end is provided with camera, and the camera is being located at test specimen fixed frame just
Upper end, camera are connected to MTI-3D malformation measuring system；Test specimen include the cement concrete slab set gradually from bottom to top,
Water-proof tack coat and asphalt mixture paving course, the middle position of the cement concrete slab are provided with cavity, cavity upper end by
Water-proof tack coat sealing, lower end are sealed by epoxy resin, and intracavitary test space-time is dry air or aqueous air.
The environmental cabinet includes that bottom plate, top plate and four blocks of side plates, bottom plate are fixedly connected with support frame, and top plate uses high light transmission
Tempered glass, the camera are located at the upper end of top plate.
Seal groove is offered on the bottom plate, the side plate is connected by seal groove and bottom plate.
Chamber door is offered on the side plate of the front end.
The test specimen fixed frame includes the fixed link being fixedly connected with the bottom plate of environmental cabinet, is provided in fixed link for pressing
Pressing plate on test specimen, the centre of the pressing plate set circular hollow, and circular hollow exposes test specimen, and circular hollow and empty cavity position are just
It is right, the camera face circular hollow.
Temperature and moisture sensors are provided in the environmental cabinet, temperature and moisture sensors are connected to temperature and humidity and generate control
Device processed.
The camera is set as two, and LED light is provided on camera.
The cavity is cylindrical hole, and support instrument tool is provided in cavity.
A kind of bridge asphalt pavement bulge formation indoor simulation test method, comprising the following steps:
1) test material preparation: preparing the cement plate of center band cavity first, then sets water-proof tack coat on cement plate upper berth, prevents
Secondly the upper end of water adhesive layer sealing cavity is laid with asphalt mixture paving course on water-proof tack coat, finally utilize asphalt mixtures modified by epoxy resin
The lower end of rouge sealing cavity, seal gas or distilled water in cavity；
2) after white dumb light paint is sprayed in test specimen upper surface, then black matte paint is sprayed, then the speckle of fabrication region area will
Test specimen is fixed on test specimen fixed frame, and sealed environment case；
3) position and the angle of camera are adjusted, MTI-3D malformation measuring system is opened, is marked using scaling board
It is fixed, 4~6 surface of test piece profile photographs are then continuously shot, error compensation is carried out；
4) temperature and humidity in set environment case, camera shooting surface of test piece profile photograph simultaneously send MTI-3D structure to
Deformation measuring system, MTI-3D malformation measuring system analyze surface of test piece profile photograph, select particular picture
Specific region obtains the deformation data of surface of test piece each point, analyzes the specific point of plurality of pictures, obtains surface of test piece position
It moves, strain data is with the changing rule of test period, i.e. completion test.
Support instrument is arranged in the step 1) in cavity to have, support instrument tool includes disk interconnected and bar, disk
Interleaving agent is smeared in upper surface, when cement plate upper berth sets water-proof tack coat, the disk upper surface and cement plate that have support instrument
Upper surface flushes；When epoxy resin sealing cavity, the sealing height that disk adjusts epoxy resin is moved up and down.
Compared with prior art, apparatus of the present invention generate controller using temperature and humidity and improve environment the temperature inside the box, test specimen drum
The load of packet is acted on from deck paving system internal gas expanded by heating, carrys out source module with deck paving bulge actual loading
It is identical, it overcomes previous by the shortcomings that artificially load of setting mechanical load is difficult to the accurate simulation atmospheric pressure mode of action.Test specimen
Bulge process is a dynamic process, and after bulge volume becomes larger, interior air pressure reduces naturally, and bulge extension stops therewith, with
Temperature continues to increase, and air pressure increases therewith in bulge, and bulge continues to develop, and above procedure is a homeostasis process, with reality
Border bridge floor bulge forming process is identical, but previous artificial setting mechanical load method is difficult to realize the load of the above complexity
Journey, and bulge is the process quickly formed in mechanical load test method, is not inconsistent with actual conditions.Temperature in environmental cabinet
Function is set with humidity, can sufficiently simulate the temperature and humidity situation of actual environment, temperature is two to the influence of bulge
Aspect: on the one hand influencing the source that bulge forms load, i.e., the size with temperature of air pressure are directly related in Deck pavement；It is another
Aspect deck paving system material is temperature-sensitive material, and temperature directly affects the mechanical property of material, that is, influences its resistance
The ability of bulge changes the temperature set in environmental cabinet, influences simultaneously on above two aspect, this was formed with live bridge floor bulge
Journey is affected by temperature effect and is consistent, and previous mechanical load analogy method is difficult to realize.It is air that it is intracavitary, which to test space-time,
Or water vapour, can sufficiently simulate floorings dry and wet condition, bridge deck pavement material voidage etc. may influence air pressure size because
The influence that element forms bulge, this point are even more that mechanical load simulator and method are difficult to realize.The present invention can be abundant
It simulates in the deck paving system construction stage, different type water-proof tack coat bulge forming process, records bridge deck pavement bulge
Development process morphological change characteristics, i.e. vertical deflection and unsticking radius, comparative evaluation difference water-proof tack coat resist bulge disease
Ability, while can sufficiently simulate different paving structure bulge forming processes, comparative evaluation in deck paving system operation stage
Different pavement materials resists bulge disease ability.The present invention is based on MTI-3D malformation measuring systems, using non-contact complete
Field displacement measurement system can overcome the problems, such as that in the past sensor generates interference when to surface of test piece displacement measurement, realizes simultaneously
The shortcomings that each point displacement changes over time process, overcomes previous spot measurement within the scope of monitoring test specimen bulge.Present invention test
Device reproducibility is good, and multiplicating test, and device movement easy to disassemble can be carried out to bulge forming process under same operating,
Use can be quickly assembled in different experiments room, it is easy to spread.
Further, top plate uses high light transmission tempered glass, and camera is located at tempered glass upper end, improves the transmission of light
Rate, the surface of test piece profile photograph for acquiring camera are more clear, and improve the reliability of test structure.
Further, seal groove is set on bottom plate, side plate is connected by seal groove and bottom plate, makes entire environmental cabinet leakproofness
It is good, interference of the external environment to test is avoided, the accuracy of test is further promoted.
Further, using the fixed test specimen of pressing plate, fixed is more firm, exposes test specimen using circular hollow, round empty
The heart and empty cavity position face, make the influence of the position of bulge not compression plate, and camera can be good at collecting the region position of deformation
It sets.
Further, LED light provides certain brightness for test specimen upper surface, using two cameras, adjusts camera position and angle
Degree can be such that the picture of shooting is clearly overlapped, and the analysis for MTI-3D malformation measuring system provides reliable deformation of cylindrical
Foundation.
The method of the present invention includes test material preparation, test specimen installation, experimental enviroment setting and bulge whole audience displacement measurement step, energy
Enough speeding-up simulation different type bridge deck pavement material bulge disease generating processes in construction and operation, overall process record bulge hair
Spread state obtains bulge in the displacement of the different phase whole audience and strain characteristics, and the major influence factors for probing into bulge formation have
It is significant.
Further, during water-proof tack coat is layed in cement plate surface, support instrument tool is played a supporting role, to guarantee
Being laid with the not formed water-proof binding layer material of early strength is an entirety at cement plate cavity, to the cooling shape of water-proof tack coat
After intensity, slowly support instrument is had and is removed outside hole, since interleaving agent, support instrument tool and waterproof had been smeared in support instrument tool surface
The globality that adhesive layer is easily disengaged from without influencing water-proof tack coat, to be prepared into water-proof tack coat and there are circular hole areas
The cement plate test specimen in domain, there to be the region of non-adherent defect between construction simulation process floorings and water-proof tack coat；Epoxy
The effect of resin is to close cavity, it is ensured that is difficult to escape when air heats expand in cavity, to generate pavement material
The effect of heaving, the effect of support instrument tool are to guarantee that epoxy resin condenses at different height in hole, can adjust epoxy resin
Sealing height.
Detailed description of the invention
Fig. 1 is the front schematic view of apparatus of the present invention；
Fig. 2 is the schematic top plan view of apparatus of the present invention；
Fig. 3 is the structural schematic diagram of pressing plate；
Fig. 4 is the structural schematic diagram of support instrument tool；
Fig. 5 is the structural schematic diagram of test specimen；
Wherein, 1- support frame, 2- environmental cabinet, 3- test specimen fixed frame, 4-MTI-3D malformation measuring system, 5- test specimen,
5-1- cement concrete slab, 5-2- water-proof tack coat, 5-3- asphalt mixture paving course, 5-4- cavity, 5-5- epoxy resin, 5-
6- support instrument tool, 6- camera, 7- bolt, 8- bottom plate, 9- side plate, 10- top plate, 11- temperature and humidity generate controller, 12- fixed link,
13- tightening nut, 14- pressing plate, 15- circular hole, 16- circular hollow, 17- chamber door.
Specific embodiment
Combined with specific embodiments below with Figure of description the present invention will be further explained explanation.
Referring to Fig. 1 and Fig. 2, apparatus of the present invention include that support frame 1, environmental cabinet 2, test specimen fixed frame 3 and MTI-3D structure become
Shape measuring system 4.Support frame 1 is placed in ground grading, and effect is the upper element for supporting whole device, and support includes environment
Case 2, test specimen fixed frame 3, test specimen 5 and camera 6 camera frame.Support frame 1 is made of four rigid cylinders, cylindrical body top
End is equipped with thread groove, realizes that the bottom plate 8 of support frame 1 and environmental cabinet 2 is fixed by the connection function of bolt 7 and thread groove, in turn
Realize supporting role of the support frame 1 to upper element.
Environmental cabinet 2 is square frame, and main function is to provide the temperature and humidity under certain condition in test process
Environment, to simulate warm and humid environmental change on practical bridge floor.The bottom plate 8 of environmental cabinet 2 is connected with support frame 1 by bolt 7, and examination is played
Test the effect of station and enclosed environment case 2.Seal groove is provided on bottom plate 8, the side plate 9 of the steel of environmental cabinet 2 passes through sealing
Slot and bottom plate 8 are closely coupled.Top plate 10 is the tempered glass of high projection, provides the window that can be shot for camera 6.Camera 6
When shooting right above environmental cabinet 2, camera lens face test specimen 5.It is provided with chamber door 17 on front side of environmental cabinet 2, places test specimen 5, ring to facilitate
The chamber door 17 of border case 2 is connect by hinge with the side plate in 2 left side of environmental cabinet.Environmental cabinet 2 is internally provided with temperature and humidity sensing
Device, the side wall of environmental cabinet 2 are provided with temperature and humidity and generate controller 11.The effect of temperature setting is gas in the cavity 5-4 for make test specimen
Body generates huge expansive force when heated, and then heaves pavement material gradually.The effect of humidity set is to make sky in environmental cabinet 2
Gas has certain humidity, to simulate practical bridge floor air environment humidity conditions.
The effect of test specimen fixed frame 3 to guarantee that test specimen is fixed during the test, camera 6 can steady shot to test specimen
The change procedure of pavement material surface bulge, without being influenced by the whole rigid body displacement of test specimen 5.Test specimen fixed frame 3 is solid by four
The pressing plate 14 of fixed pole 12, eight tightening nuts 13 and one piece of steel forms.Pass through the bottom plate 8 of four fixed links 12 and environmental cabinet 2
It is connected, fixed link 12 can be inserted vertically into hole prefabricated on the bottom plate 8 of environmental cabinet 2；Referring to Fig. 3, the quadrangle of pressing plate 14 is arranged
There is circular hole 15, it is circular hollow 16 in the middle part of pressing plate 14 that pressing plate 14 can be connect by circular hole with fixed link 12, and pressing plate 14 lies against examination
On part 5, the fixed test specimen 5 of pressing plate 14 is realized by the tightening nut 13 of 12 upper and lower ends of fixed link.
MTI-3D malformation measuring system is for shooting, handling, analyzing test specimen pavement material surface bulge in environmental cabinet
Deformation, which is based on digital image correlation technique and is displaced progress non-cpntact measurement to surface of test piece bulge, public by Belgian MTI
Department's production, main accessories include high-power LED lamp lighting device, industrial camera 6 and computer control system.Camera 6
When shooting right above environmental cabinet 2,5 surface of camera lens face test specimen, filming frequency automatically setting can reach and per second at least shoot
Primary frequency.
The method of the present invention, comprising the following steps:
1. the preparation of test specimen
(1) cement concrete for first mixing certain mass, by groups such as cement, coarse aggregate, fine sand, water, additives
At being fitted into length, width and height is respectively that the track plate in the track die trial of 30cm*30cm*5cm, equipped with material is put on a vibration table, is continued
3~5min is vibrated, the board-like test specimen of cement concrete is formed, during vibratory concrete, is inserted vertically into concrete central location
Diameter is 1cm, is highly the steel solid cylinder of 6cm, at the end of the concrete initial set time, by steel solid cylinder from mixed
It is slowly withdrawn in concrete board, then the vertical circular hole that a diameter is 1cm is obtained in cement plate center, then by code requirement to band
Hole cement concrete slab carries out health 28d, to simulate cement concrete bridge deck plate；
(2) cement concrete slab is put into drier 48h, to simulate cement concrete slab completely dried state, obtain as
Cement concrete slab 5-1 shown in fig. 5；
(3) it makes support instrument as shown in Figure 4 and has 5-6, support instrument tool 5-6 is put into the cylinder of cement concrete slab 5-1
In shape hole, it is ensured that support instrument has the top disc of 5-6 and the upper surface of cement concrete slab 5-1 maintains an equal level, and has 5-6 in support instrument
Bituminous Isolation Agent is smeared on the disk at top, such as the mixed solution of talcum powder and glycerine；
(4) class water-proof binding layer material, such as rubber will be sprayed using the method that liquid spray gun resistant to high temperature or application are smeared
Pitch, SBS modified pitch etc., by preset dose requirements, such as 1.5kg/m2, it is uniformly sprayed onto cement concrete plate surface, or
Coiled material class water-proof binding layer material, such as heating of APA waterproof roll are directly laid on cement concrete plate surface., all kinds of waterproofs
During adhesive layer is layed in the surface cement concrete slab 5-1, support instrument tool 5-6 plays a supporting role, to guarantee to be laid with just
The not formed water-proof binding layer material of phase intensity is an entirety in cement plate central hole, to the cooling shape of water-proof tack coat 5-2
After intensity, slowly support instrument is had and is removed outside hole, since interleaving agent, support instrument tool and waterproof had been smeared in support instrument tool surface
The globality that adhesive layer can be easily disengaged from without influencing water-proof tack coat, so that is be prepared into has water-proof tack coat and there is circle
The cement plate test specimen of bore region, there to be non-adherent defect area between construction simulation process floorings and water-proof tack coat；
(5) it after laying water-proof tack coat in cement plate upper surface is cooled into intensity, is further laid on it and is compacted bridge
Face asphalt, as AC class asphalt, casting type asphaltic mixture, SMA asphalt and bituminous epoxy mix
Material etc., support instrument tool is played a supporting role in pavement material process of deployment, with the not formed water-proof binding layer material of proof strength
It in cement plate central hole is that an entirety slowly has support instrument after material intensity of cooling to be mixed is formed with asphalt
It removes outside cylindrical hole, since interleaving agent had been smeared on support instrument tool surface, support instrument tool is mixed with water-proof tack coat, pitch
The globality that material can be easily disengaged from without influencing upper layer of material, to be prepared into as shown in Figure 5 with water-proof tack coat, pitch
Pave-load layer and cement plate test specimen there are circular hole region exist to simulate operation process floorings with Deck pavement and non-fully bond
The region of defect, step (4), (5) middle test specimen prepared are that two kinds big of type represents, and sequencing is not present, is arranged side by side；
(6) test specimen in (4) and (5) is overturn and is laid flat, make cement plate bottom surface upward, by support instrument used in above step
Tool is put into the cylindrical hole of cement plate, and so that branch is shifted tool top and maintained an equal level with hole middle height, and stream is then poured into hole
The poor epoxy resin 5-5 of dynamic property, the effect of epoxy resin is to close hole, it is ensured that be difficult to when air heats expand in hole from
Hole evolution, to generate the effect of heaving to pavement material, the effect of support instrument tool is to guarantee that epoxy resin is highly located to coagulate in hole 1/2
Knot forms about one closing, is highly 2.5cm cylindrical space, closed air is in hole as shown in Figure 5 with the scene of simulating
The air being enclosed between Deck pavement and floorings in adhesive free region；
(7) the test specimen overturning in (4) and (5) is laid flat, makes cement plate bottom surface upward, is then infused by syringe into hole
Quantitative distilled water is penetrated, such as 1mL~3mL, then support instrument tool is put into cement plate hole with shown in step 6, and pour into epoxy
Resin makes cement plate center form about one closing, is highly the cylindrical space of 2.5cm, closes in hole as shown in Figure 5
Air and water to simulate air and water in the adhesive free region that is enclosed between Deck pavement and floorings of scene, step
(6), the test specimen prepared in (7) is that two kinds big of type represents, that is, is completely dried and has water, sequencing is not present, is arranged side by side
's；
2. test specimen is fixed
(1) centered on cylindrical hole position, white dumb light paint is sprayed in surface of test piece, then sprays black matte paint again,
The speckle of certain area area is manufactured, it is its foundation that the setting of speckle, which is the basis using MTI-3D malformation measuring system,
The steps necessary of coordinate system progress whole audience displacement measurement；
(2) test specimen with speckle is lain against on environmental cabinet bottom plate, the fixed link of fixed frame is then inserted into bottom plate
Hole in, secondly the hole of pressing plate quadrangle is aligned with fixed link, lie against on test specimen, finally by fixed link upper and lower ends spiral shell
Bolt is tightened, and test specimen is fixed；
3. preparation
(1) LED light is opened, certain brightness is provided for surface of test piece, and adjust camera position and angle, makes two cameras
The picture of shooting is clearly overlapped as far as possible；
(2)) MTI-3D malformation measuring system is opened, the scaling board carried using MTI-3D malformation measuring system
It is demarcated, then 4~6 surface of test piece pictures of continuous paving shooting, carry out error compensation by measuring system software；
4. actual environment is simulated
Environmental cabinet is heated, while by humidity in humidity setter set environment case, and passes through Temperature and Humidity Control
Device record temperature and humidity versus time curve, temperature, humidity guarantee when reaching setting value it is constant, while one test
In period, according to settable different temperature change period and humidity period of change inside experiment purpose environmental cabinet；
5. the acquisition of bulge morphological data and analysis
While environmental cabinet is started to work, the shooting software of MTI-3D malformation measuring system is opened, is tested at one
Surface of test piece profile is shot by every 10 seconds primary rates in period, the picture automatic storage collected is in computer；
Using the analysis software of MTI-3D malformation measuring system, test specimen is can be obtained in the specific region of selected particular picture
The deformation data of surface each point further can also analyze the specific point of plurality of pictures, obtain its displacement, strain data with
The changing rule of test period.
The present invention mainly has the advantage that
1. the load of test specimen bulge is acted on from deck paving system internal gas expanded by heating in the present invention, with bridge floor
It is identical that bulge actual loading of mating formation carrys out source module, overcomes previous by the way that the external loads such as coated by dielectric or axis load are artificially arranged
The shortcomings that being difficult to the accurate simulation atmospheric pressure mode of action.
2. test specimen bulge process is a dynamic process in the present invention, after bulge volume becomes larger, interior air pressure reduces naturally,
Bulge extension stops therewith, and as temperature continues to increase, air pressure increases therewith in bulge, and bulge continues to develop, and above procedure is
One homeostasis process is identical as practical bridge floor bulge forming process.But previous artificial setting mechanical load method is difficult to
The above complicated loading procedure is realized, and bulge is the process quickly formed in mechanical load test method, with practical feelings
Condition is not inconsistent.
3. function is arranged by the temperature and humidity in environmental cabinet, the temperature and humidity shape of actual environment can be sufficiently simulated
Condition.Temperature is both sides on the influence of bulge: on the one hand influencing the source that bulge forms load, i.e. gas in Deck pavement
The size of pressure is directly related with temperature；Another aspect deck paving system material is temperature-sensitive material, and temperature directly affects
The mechanical property of material influences its ability for resisting bulge.Change the temperature set in environmental cabinet in the present invention, it can be to above
Two aspects influence simultaneously, this is affected by temperature effect with live bridge floor bulge forming process and is consistent, and previous simulation side
Method is difficult to realize.
4. the present invention can sufficiently simulate floorings dry and wet condition, bridge deck pavement material voidage etc., may to influence air pressure big
The influence that small factor forms bulge, and previous simulator and method is difficult to realize.
5. the present invention can sufficiently simulate different type water-proof tack coat bulge in the deck paving system construction stage and be formed
Process can resist bulge disease ability with comparative evaluation difference water-proof tack coat.Deck paving system can be sufficiently simulated simultaneously
Different paving structure bulge forming processes in operation stage can resist bulge disease energy with the different pavement material of comparative evaluation
Power.
6. can overcome to be displaced surface of test piece and survey the present invention is based on the non-contact whole audience displacement measurement system of MTI-3D in the past
Sensor leads to the problem of interference when amount, while can also realize that each point displacement changed over time within the scope of monitoring test specimen bulge
Journey, the shortcomings that overcoming previous spot measurement.
7. present invention test reproducibility is good, multiplicating test can be carried out to bulge forming process under same operating.
8. experimental rig movement easy to disassemble in the present invention can quickly assemble use in different experiments room, easy to spread.
Claims (9)
1. a kind of bridge asphalt pavement bulge forms indoor simulation experimental rig, which is characterized in that including support frame (1), support
It is fixedly installed on frame (1) environmental cabinet (2), the test specimen fixed frame (3) for placing test specimen (5), ring is provided in environmental cabinet (2)
It is provided with the temperature and humidity for adjusting temperature and humidity environment on border case (2) and generates controller (11), environmental cabinet (2) the upper end setting
Have camera (6), the camera (6) is located at the positive upper end of test specimen fixed frame (3), and camera (6) is connected to MTI-3D malformation survey
Amount system (4)；Test specimen (5) includes the cement concrete slab (5-1) set gradually from bottom to top, water-proof tack coat (5-2) and drip
The middle position of green mixture pave-load layer (5-3), the cement concrete slab (5-1) is provided with cavity (5-4), cavity (5-4)
Upper end is sealed by water-proof tack coat (5-2), and lower end is sealed by epoxy resin (5-5), is dry air in cavity (5-4) when test
Or aqueous air.
2. a kind of bridge asphalt pavement bulge according to claim 1 forms indoor simulation experimental rig, which is characterized in that
The environmental cabinet (2) includes that bottom plate (8), top plate (10) and four pieces of side plates (9), bottom plate (8) are fixedly connected with support frame (1), top
Plate (10) uses high light transmission tempered glass, and the camera (6) is located at the upper end of top plate (10).
3. a kind of bridge asphalt pavement bulge according to claim 2 forms indoor simulation experimental rig, which is characterized in that
Seal groove is offered on the bottom plate (8), the side plate (9) is connected by seal groove and bottom plate (8).
4. a kind of bridge asphalt pavement bulge according to claim 3 forms indoor simulation experimental rig, which is characterized in that
Chamber door (17) are offered on the side plate (9) of environmental cabinet (2) front end.
5. a kind of bridge asphalt pavement bulge according to claim 4 forms indoor simulation experimental rig, which is characterized in that
The test specimen fixed frame (3) includes the fixed link (12) being fixedly connected with the bottom plate (8) of environmental cabinet (2), and fixed link is set on (12)
It is equipped with the pressing plate (14) for being pressed on test specimen (5), the centre of the pressing plate (14) is circular hollow (16), circular hollow (16)
Expose test specimen (5), circular hollow (16) and the position cavity (5-4) face, camera (6) the face circular hollow (16).
6. a kind of bridge asphalt pavement bulge according to claim 1 forms indoor simulation experimental rig, which is characterized in that
Temperature and moisture sensors are provided in the environmental cabinet (2), temperature and moisture sensors are connected to temperature and humidity and generate controller
(11)。
7. a kind of bridge asphalt pavement bulge according to claim 1 forms indoor simulation experimental rig, which is characterized in that
The cavity (5-4) is cylindrical hole, and support instrument tool (5-6) is provided in cavity (5-4).
8. a kind of bridge asphalt pavement for forming indoor simulation experimental rig based on bridge asphalt pavement bulge described in claim 1
Bulge forms indoor simulation test method, which comprises the following steps:
1) test material preparation: the cement concrete slab (5-1) of center band cavity (5-4) is prepared first, then in cement concrete slab
The upper berth (5-1) is set water-proof tack coat (5-2), the upper end of water-proof tack coat (5-2) sealing cavity (5-4), secondly in water-proof binding
It is laid with asphalt mixture paving course (5-3) on layer (5-2), finally utilizes the lower end of epoxy resin (5-5) sealing cavity (5-4),
The interior hermetically drying air of cavity (5-4) or aqueous air；
2) after white dumb light paint is sprayed in test specimen upper surface, then black matte paint is sprayed, the speckle of fabrication region area, then by test specimen
(5) it is fixed on test specimen fixed frame (3), and sealed environment case (2)；
3) position and the angle of camera (6) are adjusted, opens MTI-3D malformation measuring system (4), is carried out using scaling board
Then calibration is continuously shot 4~6 surface of test piece profile photographs to construct space coordinates, carry out error compensation；
4) temperature and humidity in set environment case (2), camera (6) shooting surface of test piece profile photograph simultaneously send MTI-3D knot to
Structure deformation measuring system (4), MTI-3D malformation measuring system (4) analyze surface of test piece profile photograph, select figure
The specific region of piece obtains the deformation data of surface of test piece each point, analyzes the specific point of plurality of pictures, obtains test specimen table
Face displacement, strain data complete test with the changing rule of test period.
9. a kind of bridge asphalt pavement bulge according to claim 8 forms indoor simulation test method, which is characterized in that
Setting support instrument has (5-6) in the cavity (5-4) in the step 1), support instrument tool (5-6) include disk interconnected and
Bar, disk upper surface, which smears interleaving agent, has support instrument when the upper berth cement concrete slab (5-1) sets water-proof tack coat (5-2)
The upper surface of the disk upper surface and cement concrete slab (5-1) of (5-6) flushes；Epoxy resin (5-5) sealing cavity (5-4)
When, move up and down the sealing height that disk adjusts epoxy resin (5-5).
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| CN111983205B (en) * | 2020-07-24 | 2022-07-01 | 广西交投科技有限公司 | Castle rut test-based asphalt mixture rut-resistant design method |
| CN112083152B (en) * | 2020-08-27 | 2022-07-05 | 深圳市卓宝科技股份有限公司 | Test method for simulating asphalt pavement |
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