CN113188902A - Testing machine for gutta-percha modified asphalt and testing method thereof - Google Patents
Testing machine for gutta-percha modified asphalt and testing method thereof Download PDFInfo
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- CN113188902A CN113188902A CN202110304516.5A CN202110304516A CN113188902A CN 113188902 A CN113188902 A CN 113188902A CN 202110304516 A CN202110304516 A CN 202110304516A CN 113188902 A CN113188902 A CN 113188902A
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- 238000012360 testing method Methods 0.000 title claims abstract description 138
- 239000010426 asphalt Substances 0.000 title claims abstract description 74
- 239000000899 Gutta-Percha Substances 0.000 title claims abstract description 22
- 240000000342 Palaquium gutta Species 0.000 title claims abstract description 22
- 229920000588 gutta-percha Polymers 0.000 title claims abstract description 22
- 235000017166 Bambusa arundinacea Nutrition 0.000 claims abstract description 8
- 235000017491 Bambusa tulda Nutrition 0.000 claims abstract description 8
- 241001330002 Bambuseae Species 0.000 claims abstract description 8
- 235000015334 Phyllostachys viridis Nutrition 0.000 claims abstract description 8
- 239000011425 bamboo Substances 0.000 claims abstract description 8
- 230000009471 action Effects 0.000 claims description 38
- 239000000203 mixture Substances 0.000 claims description 27
- 238000007789 sealing Methods 0.000 claims description 25
- 238000010998 test method Methods 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 11
- 239000000463 material Substances 0.000 claims description 10
- 238000005192 partition Methods 0.000 claims description 9
- 238000011160 research Methods 0.000 claims description 6
- 230000000694 effects Effects 0.000 claims description 5
- 229920001971 elastomer Polymers 0.000 claims description 5
- 241000196324 Embryophyta Species 0.000 claims description 4
- 239000011248 coating agent Substances 0.000 claims description 3
- 238000000576 coating method Methods 0.000 claims description 3
- 238000005056 compaction Methods 0.000 claims description 3
- 239000010687 lubricating oil Substances 0.000 claims description 3
- 230000005012 migration Effects 0.000 claims description 3
- 238000013508 migration Methods 0.000 claims description 3
- 230000006641 stabilisation Effects 0.000 claims description 3
- 238000011105 stabilization Methods 0.000 claims description 3
- 238000010792 warming Methods 0.000 claims description 3
- 230000006978 adaptation Effects 0.000 claims description 2
- 238000001125 extrusion Methods 0.000 abstract description 4
- 230000005574 cross-species transmission Effects 0.000 abstract description 3
- 230000008569 process Effects 0.000 description 4
- 239000011521 glass Substances 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 239000003190 viscoelastic substance Substances 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
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- 238000006467 substitution reaction Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0019—Compressive
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
- G01N2203/0071—Creep
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
- G01N2203/0075—Strain-stress relations or elastic constants
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/025—Geometry of the test
- G01N2203/0256—Triaxial, i.e. the forces being applied along three normal axes of the specimen
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Abstract
The invention relates to the technical field of asphalt and discloses a testing machine for gutta-percha modified asphalt and a testing method thereof. When the inside hydraulic means extrudees the inside pitch model of putting the thing section of thick bamboo after the testing machine starts, the baffle utilizes pressure downstream to push down the piston through the push rod, extrude the inside air of inflator when the piston downstream, the air passes through the conveying pipe and gets into sealed gasbag, and then aerify sealed gasbag and make sealed gasbag pop out from the seal groove, sealed gasbag pop out the back and closely laminate with the hydraulic means's of testing machine outer wall, thereby avoid the pitch sample to spill over in putting the thing section of thick bamboo when the extrusion, and then avoided the pitch to spill over the test data that leads to inaccurate.
Description
Technical Field
The invention relates to the technical field of asphalt, in particular to a testing machine for gutta-percha modified asphalt and a testing method thereof.
Background
The test methods for evaluating the high-temperature stability of the asphalt mixture are various, and mainly include an unconfined compressive strength method, a Marshall method, a triaxial test method, a creep test method, a rutting test method, a shear test and the like. At present, rutting tests are generally adopted to evaluate the high-temperature stability of asphalt mixtures, the asphalt mixtures are typical viscoelastic materials, the deformation of the mixtures is different along with the length of the action time of loads, but the rutting tests cannot record the deformation mechanism of the asphalt mixtures along with the time, so that the rutting tests are obviously insufficient for researching the mechanical properties of the asphalt mixtures, and during the action of dynamic loads, because the loading speed is high, a test piece can accurately reflect the deformation condition of a road surface under the action of automobile loads in the whole loading process, and a testing machine capable of preventing asphalt samples from overflowing is urgently needed.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides the testing machine for the gutta-percha modified asphalt and the testing method thereof, which have the advantages of avoiding the overflow of an asphalt sample in the testing process and the like, and solve the problem of inaccurate testing data caused by the overflow of the sample.
(II) technical scheme
In order to achieve the purpose of avoiding the overflow of the asphalt sample in the test process, the invention provides the following technical scheme: a testing machine for gutta-percha modified asphalt comprises a testing machine, a hinge is fixedly connected to the right surface of the testing machine, a door plate is fixedly connected to the movable end of the hinge, the door plate is movably connected with the testing machine through the hinge, an observation window is inlaid in the door plate, a workbench is arranged in the testing machine, an asphalt containing device is arranged at the top of the workbench, a trigger device is arranged in the testing machine, a groove is formed in the top of the workbench, a motor is fixedly connected to the rear side of the inner portion of the groove, a threaded rod is fixedly connected to the output end of the motor and rotatably connected to the inner portion of the groove, the asphalt containing device comprises a threaded sleeve, threads of the threaded sleeve are sleeved on the threaded rod, a movable plate is fixedly connected to the top of the threaded sleeve, the movable plate is slidably connected with the workbench, a bottom plate is fixedly connected to the top of the movable plate, and a storage barrel is fixedly connected to the top of the bottom plate, put the inside sliding connection of thing section of thick bamboo and have the baffle, the top fixedly connected with spring of bottom plate, the top of spring and the bottom fixed connection of baffle, the baffle pass through the spring with put thing section of thick bamboo sliding connection, trigger device includes the connecting pipe, and connecting pipe fixed connection has seted up the thread groove at the top of bottom plate on the inner wall of connecting pipe, the top threaded connection of connecting pipe has the blast pipe, set up on the outer wall of blast pipe with the screw thread of thread groove adaptation, the top fixedly connected with inflator of blast pipe, the inside sliding connection of inflator has the piston, the top fixedly connected with push rod of piston, the upper end and the baffle fixed connection of push rod, put and seted up the seal groove on the inner wall of thing section of thick bamboo, the inside fixedly connected with sealed gasbag of seal groove, the bottom fixedly connected with conveying pipe of connecting pipe, the upper end and the sealed gasbag fixed connection of conveying pipe.
Preferably, the bottom plate is hollow, the storage barrel is hollow and has no top surface and bottom surface, and the barrel wall of the storage barrel is also hollow.
Preferably, the lower end of the connecting pipe penetrates through the bottom plate to be communicated with the inside of the bottom plate, the exhaust pipe is communicated with the inside of the connecting pipe, and the inside of the air cylinder is communicated with the exhaust pipe.
Preferably, the outer wall of the sealed air bag is provided with wave-shaped folds.
Preferably, the conveying pipe is shaped like a letter "C".
Preferably, the transfer tube communicates with the inside of the airtight bag, and the transfer tube communicates with the inside of the connection tube.
A test method of gutta percha modified asphalt comprises the following steps:
step one, a triaxial repeated loading creep test mode is adopted, 0.2MPa of constraint stress and 0.707MPa of offset stress are applied to simulate wheel load, the loading period is 1s, the loading period comprises 0.1s of half-sine pressure load and 0.9s of interval, and the test termination condition is that the load action frequency reaches 10000 times or the LVDT exceeds the range;
secondly, considering the influence of global warming and temperature rise on the road surface, the test is selected to be 60 ℃, in order to eliminate the influence of the hoop effect at the end part of the test piece on the creep result and the test precision, a method of paving a rubber film and coating lubricating oil between films is adopted for the test piece in the test, the test piece is formed by rotary compaction, the size of the test piece is 100mm in diameter and 150mm in height, and each group of mixed materials are made into two parallel test pieces;
thirdly, the number of times of repeated load action generated corresponding to the starting point of the third stage is defined as the number of times of flow load action FN, and research on SPT shows that the number of times of flow load action FN has good correlation with the high-temperature performance of the mixture, the larger the FN is, the larger the stiffness of the mixture is, and the stronger the permanent deformation resistance is;
a large number of studies show that the deformation of the asphalt mixture under the load action goes through three stages: in the migration period, under the action of load, the deformation is rapidly increased, and the strain rate is gradually reduced along with the increase of time; in the stabilization period, under the action of load, the strain is stably increased, and the strain rate is basically kept unchanged; and in the failure period, under the action of load, the stress and strain rate are rapidly increased along with the increase of time until failure.
In order to determine the acting times of the flowing load, a three-stage model describing the permanent deformation characteristic of the asphalt mixture is established in relevant research:
the first-stage model: epsilonp＝aNb，N＜Nps；
And a second stage model: epsilonp＝εps+c(N-Nps)，Nps≤N＜Nst；
The third-stage model:
N≥Nst；
in the formula: epsilonpIs the accumulated permanent strain; n is the repeated load action times; n is a radical ofpsThe number of times of repeated load action when the second stage is generated is corresponding to the number of times of repeated load action when the second stage is generated; n is a radical ofst(or F)n) Acting times for the flowing load; epsilonpsCorresponding to the permanent strain at the time of the second stage; epsilonstCorresponding to the permanent set at the time of the third stage; a. b, c, d and f are material constants relevant to the test conditions.
(III) advantageous effects
Compared with the prior art, the invention provides a testing machine for gutta-percha modified asphalt and a testing method thereof, and the testing machine has the following beneficial effects:
1. according to the testing machine for gutta-percha modified asphalt and the testing method thereof, when the internal hydraulic device extrudes an asphalt sample plate in the storage cylinder after the testing machine is started, the partition plate moves downwards by utilizing pressure and pushes the piston downwards through the push rod, the air in the air cylinder is extruded when the piston moves downwards, the air enters the sealing air bag through the conveying pipe, the sealing air bag is inflated to enable the sealing air bag to pop out from the sealing groove, the sealing air bag is tightly attached to the outer wall of the hydraulic device of the testing machine after popping out, so that the asphalt sample is prevented from overflowing from the storage cylinder when being extruded, the inaccuracy of testing data caused by the overflow of asphalt is avoided, and the testing accuracy is improved.
2. This testing machine for gutta percha modified asphalt and test method thereof, because the asphalt sample need be through three stage side test, after first stage, after user's record data, drive the threaded rod through switch-on external power supply starter motor and rotate, the threaded rod rotates and drives whole pitch storage device through the thread bush and remove, thereby remove whole pitch storage device to the test position in next stage, carry out the position with traditional manual work and remove and compare, the device avoids the manual work to dismantle the removal, thereby the time that manual work removed the consumption has been reduced, and then experimental speed has been promoted.
3. This gutta percha is testing machine and test method for modified asphalt, the inside of door plant is inlayed and is had the observation window, and the material of observation window is the transparent glass material, and the inside of testing machine is provided with the workstation, when using the device, through switch-on external power source start-up testing machine, the inside condition of testing machine can be observed through the observation window to the operator to more accurate assurance experimental accuracy.
4. According to the testing machine for gutta-percha modified asphalt and the testing method thereof, the piston is connected to the inner portion of the air cylinder in a sliding mode, the piston is made of rubber with rough surfaces, the piston can be fixed inside the air cylinder through friction force of the material under the condition that external force is not applied to the piston, the sealing performance of the testing machine is improved, the triggering device is guaranteed not to be touched by mistake, and the practicability of the testing machine is improved.
5. This gutta percha is testing machine and test method for modified asphalt, top fixedly connected with spring through the bottom plate, when the inside hydraulic means extrudees the inside pitch model of thing section of thick bamboo after the testing machine starts, the baffle utilizes pressure downstream to extrude the spring, the spring utilizes the characteristic of self to play the effect of a buffering to whole pitch storage device, and then protected the life of device, after the extrusion, utilize the resilience of spring to drive the baffle and reset, the device's fault rate has been reduced when promoting the device practicality.
Drawings
FIG. 1 is a schematic structural view of a testing machine for gutta-percha-modified asphalt according to the present invention;
FIG. 2 is a schematic structural view of a worktable of a tester for gutta percha-modified asphalt according to the present invention;
FIG. 3 is a schematic structural view of an asphalt containing device of a testing machine for gutta percha modified asphalt of the present invention;
FIG. 4 is a schematic structural view of a base plate of a testing machine for gutta-percha-modified asphalt according to the present invention;
FIG. 5 is an enlarged view of the structure at A in FIG. 4 according to the present invention;
FIG. 6 is a schematic plane structure diagram of a storage barrel of a testing machine for gutta percha modified asphalt according to the present invention;
fig. 7 is an enlarged view of the structure at B in fig. 6 according to the present invention.
In the figure: the device comprises a testing machine 1, a hinge 2, a door panel 3, a workbench 4, an observation window 5, a groove 6, a motor 7, a threaded rod 8, a threaded sleeve 9, a moving plate 10, a bottom plate 11, a storage barrel 12, a partition plate 13, a sealing groove 14, a spring 15, a connecting pipe 16, an exhaust pipe 17, an air cylinder 18, a piston 19, a push rod 20, a conveying pipe 21 and a sealing air bag 22.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-7, the present invention provides a new technical solution: a testing machine for gutta percha modified asphalt comprises a testing machine 1, wherein the testing machine 1 is of an existing structure and is not described too much, a hinge 2 is fixedly connected to the right surface of the testing machine 1, a door plate 3 is fixedly connected to a movable end of the hinge 2, the door plate 3 is movably connected with the testing machine 1 through the hinge 2, an observation window 5 is inlaid in the door plate 3, the observation window 5 is made of transparent glass, a workbench 4 is arranged in the testing machine 1, when the testing machine is used, the testing machine 1 is started through connecting an external power supply, an operator can observe the condition in the testing machine 1 through the observation window 5, so that the test accuracy is accurately grasped, and the recording is conveniently carried out according to the condition in the test at any time, a groove 6 is formed in the top of the workbench 4, a motor 7 is fixedly connected to the rear side in the groove 6, the motor 7 is of the existing structure and is not described too much here, the output end of the motor 7 is fixedly connected with a threaded rod 8, the threaded rod 8 is rotatably connected inside the groove 6, the top of the workbench 4 is provided with an asphalt containing device, the asphalt containing device comprises a threaded sleeve 9, the threaded sleeve 9 is in threaded sleeve connection with the threaded rod 8, the top of the threaded sleeve 9 is fixedly connected with a movable plate 10, the movable plate 10 is in sliding connection with the workbench 4, the movable plate 10 can slide on the top of the workbench 4, the top of the movable plate 10 is fixedly connected with a bottom plate 11, the inside of the bottom plate 11 is of a hollow structure, the top of the bottom plate 11 is fixedly connected with an object placing barrel 12, the inside of the object placing barrel 12 is of a hollow structure and does not have a top surface and a bottom surface, the barrel wall of the object placing barrel 12 is also of a hollow structure, and the inside of the object placing barrel 12 is slidably connected with a partition plate 13, when the device is used, an asphalt sample is placed into the object placing barrel 12, because the asphalt sample needs to be subjected to three-stage side testing, after the first stage is finished, after a user records data, an external power supply is switched on to start the motor 7 to drive the threaded rod 8 to rotate, the threaded rod 8 rotates to drive the whole asphalt containing device to move through the threaded sleeve 9, so that the whole asphalt containing device is moved to a testing position of the next stage, compared with the traditional manual position moving, the device avoids manual disassembly and movement, the time consumed by manual movement is reduced, and the testing speed is further improved;
the top of the bottom plate 11 is fixedly connected with a spring 15, the top of the spring 15 is fixedly connected with the bottom of the partition plate 13, the partition plate 13 is connected with the storage barrel 12 in a sliding manner through the spring 15, the top of the bottom plate 11 is provided with a trigger device, the trigger device comprises a connecting pipe 16, the connecting pipe 16 is fixedly connected with the top of the bottom plate 11, the lower end of the connecting pipe 16 penetrates through the bottom plate 11 to be communicated with the inside of the bottom plate 11, the inner wall of the connecting pipe 16 is provided with a thread groove, the top of the connecting pipe 16 is connected with an exhaust pipe 17 in a threaded manner, the exhaust pipe 17 is communicated with the inside of the connecting pipe 16, the outer wall of the exhaust pipe 17 is provided with a thread matched with the thread groove, the top of the exhaust pipe 17 is fixedly connected with an air barrel 18, the inside of the air barrel 18 is communicated with the exhaust pipe 17, the inside of the air barrel 18 is connected with a piston 19 in a sliding manner, and the piston 19 is made of rough rubber material, under the condition that no external force is applied by the piston 19, when the device is used, when a hydraulic device in the testing machine 1 is started to extrude an asphalt sample plate in the storage barrel 12, the partition plate 13 moves downwards by pressure to push the piston 19 downwards through the push rod 20, and when the piston 19 moves downwards, air in the air barrel 18 is extruded out, so that the device is triggered;
the inner wall of the storage barrel 12 is provided with a sealing groove 14, a sealing airbag 22 is fixedly connected inside the sealing groove 14, the outer wall of the sealing airbag 22 is provided with wave-shaped creases, when the sealing airbag 22 is not inflated, the sealing airbag 22 retracts inside the sealing groove 14 by the creases, the bottom of the connecting pipe 16 is fixedly connected with a conveying pipe 21, the conveying pipe 21 is in a C shape, the upper end of the conveying pipe 21 is fixedly connected with the sealing airbag 22, the conveying pipe 21 is communicated with the inside of the connecting pipe 16, when the device is used, when the partition plate 13 moves downwards by pressure, the piston 19 is pushed downwards by the push rod 20, when the piston 19 moves downwards, air inside the air cylinder 18 is squeezed out, the air enters the sealing airbag 22 through the conveying pipe 21, and the sealing airbag 22 is inflated to pop out the sealing airbag 22 from the sealing groove 14, the sealing air bag 22 is tightly attached to the outer wall of the hydraulic device of the testing machine 1 after being popped out, so that the asphalt sample is prevented from overflowing from the storage barrel 12 during extrusion, further, the inaccurate test data caused by asphalt overflow is avoided, and the test accuracy is improved;
a testing machine for gutta-percha modified asphalt and a testing method thereof are disclosed, and the testing is operated according to the following steps:
the test methods for evaluating the high-temperature stability of the asphalt mixture are various, mainly include an unconfined compressive strength method, a Marshall method, a triaxial test method, a creep test method, a rutting test method, a shear test and the like, at present, the rutting test is generally adopted for evaluating the high-temperature stability of the asphalt mixture, the asphalt mixture is a typical viscoelastic material, the deformation of the mixture is different along with the length of the acting time of a load, but the rutting test cannot record the deformation mechanism of the asphalt mixture along with the time, so that the rutting test is obviously insufficient for researching the mechanical properties of the asphalt mixture, when the asphalt mixture is in dynamic load action, as the loading speed is higher, a test piece can more accurately reflect the deformation condition of a road surface under the action of an automobile load in the whole loading process, therefore, the uniaxial dynamic creep test is more consistent with the stress state of the road mixture, and the uniaxial dynamic creep does not need to apply lateral pressure, the operation is relatively simple, the deformation resistance of the mixture is evaluated by using a single-shaft dynamic load test, the test is more practical and the precision is higher;
firstly, a triaxial repeated loading creep test mode is adopted, 0.2MPa of constraint stress and 0.707MPa of offset stress are applied to simulate wheel load, the loading period is 1s, the loading period comprises 0.1s of half-sine pressure load and 0.9s of interval, the test termination condition is that the load action frequency reaches 10000 times or the LVDT exceeds the range,
secondly, considering the influence of global warming and temperature rise on the road surface, the test is selected to be 60 ℃, in order to eliminate the influence of the hoop effect at the end part of the test piece on the creep result and the test precision, a method of paving a rubber film and coating lubricating oil between films is adopted for the test piece in the test, the test piece is formed by rotary compaction, the size of the test piece is 100mm in diameter and 150mm in height, and each group of mixed materials are made into two parallel test pieces;
thirdly, the number of times of repeated load action generated corresponding to the starting point of the third stage is defined as the number of times of flow load action FN, and research on SPT shows that the number of times of flow load action FN has good correlation with the high-temperature performance of the mixture, the larger the FN is, the larger the stiffness of the mixture is, and the stronger the permanent deformation resistance is;
a large number of studies show that the deformation of the asphalt mixture under the load action goes through three stages: in the migration period, under the action of load, the deformation is rapidly increased, and the strain rate is gradually reduced along with the increase of time; in the stabilization period, under the action of load, the strain is stably increased, and the strain rate is basically kept unchanged; and in the failure period, under the action of load, the stress and strain rate are rapidly increased along with the increase of time until failure.
In order to determine the acting times of the flowing load, a three-stage model describing the permanent deformation characteristic of the asphalt mixture is established in relevant research:
the first-stage model: epsilonp＝aNb，N＜Nps；
And a second stage model: epsilonp＝εps+c(N-Nps)，Nps≤N＜Nst；
The third-stage model:
N≥Nst；
in the formula: epsilonpIs the accumulated permanent strain; n is the repeated load action times; n is a radical ofpsThe number of times of repeated load action when the second stage is generated is corresponding to the number of times of repeated load action when the second stage is generated; n is a radical ofst(or F)n) Acting times for the flowing load; epsilonpsCorresponding to the permanent strain at the time of the second stage; epsilonstCorresponding to the permanent set at the time of the third stage; a. b, c, d and f are material constants relevant to the test conditions.
The working principle is as follows:
when the device is used, firstly, an asphalt sample is put into the storage barrel 12, the asphalt sample needs to be tested in three stages, after the first stage is finished, a user records data, then the user switches on an external power supply to start the motor 7 to drive the threaded rod 8 to rotate, the threaded rod 8 rotates to drive the whole asphalt containing device to move through the threaded sleeve 9, so that the whole asphalt containing device is moved to the testing position of the next stage, compared with the traditional manual position movement, the device avoids manual disassembly movement, so that the time consumed by manual movement is reduced, the testing speed is further increased, then when the internal hydraulic device extrudes an asphalt sample plate in the storage barrel 12 after the testing machine 1 is started, the partition plate 13 moves downwards by using pressure to push the piston 19 downwards through the push rod 20, and when the piston 19 moves downwards, the air in the air barrel 18 is extruded, the air passes through conveying pipe 21 and gets into sealed gasbag 22, and then aerifys sealed gasbag 22 and makes sealed gasbag 22 pop out from seal groove 14, sealed gasbag 22 pop out the back and closely laminate with testing machine 1's hydraulic means's outer wall, thereby avoid the pitch sample to spill over in putting a thing section of thick bamboo 12 when the extrusion, at last through switch-on external power source start-up testing machine 1, the operator can observe the inside condition of testing machine 1 through observation window 5, thereby more accurate assurance experimental precision.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. The utility model provides a gutta percha testing machine for modified asphalt, includes testing machine (1), and the right fixed surface of testing machine (1) is connected with hinge (2), and the expansion end fixedly connected with door plant (3) of hinge (2), door plant (3) are through hinge (2) and testing machine (1) swing joint, its characterized in that: the inside of door plant (3) is inlayed and is had observation window (5), and the inside of testing machine (1) is provided with workstation (4), and the top of workstation (4) is provided with pitch storage device, and the inside of testing machine (1) is provided with trigger device.
2. The testing machine for gutta percha modified asphalt as in claim 1, which comprises: recess (6) are seted up at the top of workstation (4), rear side fixedly connected with motor (7) inside recess (6), output fixedly connected with threaded rod (8) of motor (7), and threaded rod (8) rotate to be connected in the inside of recess (6).
3. The testing machine for gutta percha modified asphalt as in claim 1, which comprises: the asphalt storage device comprises a threaded sleeve (9), wherein the threaded sleeve (9) is in threaded sleeve connection with a threaded rod (8), a movable plate (10) is fixedly connected to the top of the threaded sleeve (9), the movable plate (10) is in sliding connection with a workbench (4), a bottom plate (11) is fixedly connected to the top of the movable plate (10), an article storage barrel (12) is fixedly connected to the top of the bottom plate (11), and a partition plate (13) is slidably connected to the inner portion of the article storage barrel (12).
4. The testing machine for gutta-percha-modified asphalt as in claim 3, wherein: the interior of the bottom plate (11) is of a hollow structure, the interior of the storage barrel (12) is of a hollow structure and does not have a top surface and a bottom surface, and the barrel wall of the storage barrel (12) is also of a hollow structure.
5. The testing machine for gutta-percha-modified asphalt as in claim 3, wherein: the top fixedly connected with spring (15) of bottom plate (11), the top of spring (15) and the bottom fixed connection of baffle (13), baffle (13) pass through spring (15) and put thing section of thick bamboo (12) sliding connection.
6. The testing machine for gutta percha modified asphalt as in claim 1, which comprises: trigger device includes connecting pipe (16), connecting pipe (16) fixed connection is at the top of bottom plate (11), the thread groove has been seted up on the inner wall of connecting pipe (16), the top threaded connection of connecting pipe (16) has blast pipe (17), set up the screw thread with the thread groove adaptation on the outer wall of blast pipe (17), the top fixedly connected with inflator (18) of blast pipe (17), the inside sliding connection of inflator (18) has piston (19), the top fixedly connected with push rod (20) of piston (19), the upper end and baffle (13) fixed connection of push rod (20).
7. The testing machine for gutta-percha-modified asphalt as in claim 6, which comprises: the lower end of the connecting pipe (16) penetrates through the bottom plate (11) to be communicated with the inside of the bottom plate (11), the exhaust pipe (17) is communicated with the inside of the connecting pipe (16), and the inside of the air cylinder (18) is communicated with the exhaust pipe (17).
8. The testing machine for gutta-percha-modified asphalt as in claim 3, wherein: the inner wall of the storage barrel (12) is provided with a sealing groove (14), the inside of the sealing groove (14) is fixedly connected with a sealing airbag (22), and the outer wall of the sealing airbag (22) is provided with wave-shaped creases.
9. The testing machine for gutta-percha-modified asphalt as in claim 6, which comprises: the bottom fixedly connected with conveying pipe (21) of connecting pipe (16), conveying pipe (21) shape is "C" style of calligraphy, the upper end and sealed gasbag (22) fixed connection of conveying pipe (21), and conveying pipe (21) communicate with each other with the inside of sealed gasbag (22), and conveying pipe (21) communicate with each other with the inside of connecting pipe (16).
10. The gutta percha modified asphalt test method as in claim 1, which is characterized in that: the test was conducted as follows:
firstly, a triaxial repeated loading creep test mode is adopted, 0.2MPa of constraint stress and 0.707MPa of offset stress are applied to simulate wheel load, the loading period is 1s, the loading period comprises 0.1s of half-sine pressure load and 0.9s of interval, the test termination condition is that the load action frequency reaches 10000 times or the LVDT exceeds the range,
secondly, considering the influence of global warming and temperature rise on the road surface, the test is selected to be 60 ℃, in order to eliminate the influence of the hoop effect at the end part of the test piece on the creep result and the test precision, a method of paving a rubber film and coating lubricating oil between films is adopted for the test piece in the test, the test piece is formed by rotary compaction, the size of the test piece is 100mm in diameter and 150mm in height, and each group of mixed materials are made into two parallel test pieces;
thirdly, the number of times of repeated load action generated corresponding to the starting point of the third stage is defined as the number of times of flow load action FN, and research on SPT shows that the number of times of flow load action FN has good correlation with the high-temperature performance of the mixture, the larger the FN is, the larger the stiffness of the mixture is, and the stronger the permanent deformation resistance is;
a large number of studies show that the deformation of the asphalt mixture under the load action goes through three stages: in the migration period, under the action of load, the deformation is rapidly increased, and the strain rate is gradually reduced along with the increase of time; in the stabilization period, under the action of load, the strain is stably increased, and the strain rate is basically kept unchanged; and in the failure period, under the action of load, the stress and strain rate are rapidly increased along with the increase of time until failure.
In order to determine the acting times of the flowing load, a three-stage model describing the permanent deformation characteristic of the asphalt mixture is established in relevant research:
the first-stage model: epsilonp＝aNb，N＜Nps；
And a second stage model: epsilonp＝εps+c(N-Nps)，Nps≤N＜Nst；
The third-stage model:
in the formula: epsilonpIs the accumulated permanent strain; n is the repeated load action times; n is a radical ofpsThe number of times of repeated load action when the second stage is generated is corresponding to the number of times of repeated load action when the second stage is generated; n is a radical ofst(or F)n) Acting times for the flowing load; epsilonpsCorresponding to the permanent strain at the time of the second stage; epsilonstCorresponding to the permanent set at the time of the third stage; a. b, c, d and f are material constants relevant to the test conditions.
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2021
- 2021-03-22 CN CN202110304516.5A patent/CN113188902A/en active Pending
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| US6125685A (en) * | 1997-09-30 | 2000-10-03 | The Board Of Trustees Of The University Of Arkansas | Apparatus and method for the evaluation of asphalt mixes |
| US20020014110A1 (en) * | 1998-06-15 | 2002-02-07 | Hussain U. Bahia | Laboratory asphalt stability test and apparatus |
| JP2002250683A (en) * | 2001-02-26 | 2002-09-06 | Kajima Corp | Device and method for testing deformation performance of asphalt material |
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