CN107219131B - A kind of asphalt horizontal shear performance test apparatus and method considering local axial compressive force - Google Patents
A kind of asphalt horizontal shear performance test apparatus and method considering local axial compressive force Download PDFInfo
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- CN107219131B CN107219131B CN201710338055.7A CN201710338055A CN107219131B CN 107219131 B CN107219131 B CN 107219131B CN 201710338055 A CN201710338055 A CN 201710338055A CN 107219131 B CN107219131 B CN 107219131B
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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
- G01N3/24—Investigating strength properties of solid materials by application of mechanical stress by applying steady shearing 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
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0025—Shearing
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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
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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
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/026—Specifications of the specimen
- G01N2203/0262—Shape of the specimen
- G01N2203/0266—Cylindrical specimens
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Abstract
The invention discloses a kind of asphalt horizontal shear performance test apparatus and method for considering local axial compressive force, and device includes: asphalt cylinder test specimen, circular steel cushion block, steel bushing, semi-circular shape pressure head, spill pedestal, bolt and scissor-like jack；Method is specially to use universal testing machine, there is the asphalt cylinder test specimen of axial Local Loads at the uniform velocity to be loaded effect by semi-circular shape pressure head, the load-deformation curve for drawing and recording automatically test specimen by test piece deformation measurement device LVDT and data collection system, according to the shearing strength of the load peak computational asphalt of reading.The present invention effectively simulates the stress form that wheel load acts on lower pavement structure Asphalt Mixture, also studies the influence under different pressures effect to Anti-Shear Characteristics of Asphalt Mixtures by changing the size of local axial compressive force；And the present invention is using being parallel to the loading form in the face of rolling, can evaluation asphalt definitely horizontal shear performance.
Description
Technical field
The present invention relates to highway engineering technical field, especially a kind of asphalt for considering local axial compressive force is horizontal
Experiment on Shearing Resistance device and method.
Background technique
With the fast development of China's road construction, bituminous pavement is with its surfacing, noise is small, seamless, driving is relaxed
It is suitable, construction is fast, simple and convenient for maintenance and accepted extensively by people, but bituminous pavement is poor to the adaptability of temperature, high temperature or
Pavement disease, and the decline of the Service Performance of Asphalt Pavement with early stage build are all easy to appear when low temperature, China steps into
Maintenance with build the epoch laid equal stress on.
Currently, the bituminous pavement that China is built mostly uses greatly semi-rigid type base, base is big compared with surface layer rigidity, works as summer temp
When higher, for asphalt concrete pavement under the repeated action of wheel load, the asphalt of surface layer can be insufficient because of shearing strength,
And flow deformation is generated, and then accumulate and form track.Just because of this reason, current anti-shear performance detection test is most
The evaluation of the vertical shear behavior of asphalt is absorbed in, to prevent the generation of track.But vehicle is in the process to move forward
In, not only there is vertical shear action to bituminous pavement, also plays the role of shearing force in parallel road surface direction, especially opening
During dynamic, brake and climb and fall.Bituminous pavement horizontal shear strength is insufficient, easily causes the pushing of paving mix and gathers around
Packet, and then more serious pavement disease is generated, it is unfavorable to driving a vehicle, also increase maintenance cost.
Current Anti-Shear Characteristics of Asphalt Mixtures is tested, is the vertical shear resistance of progress of being further applied load to the face of rolling mostly
The measurement of asphalt horizontal shear performance can be detected and have ignored, in other words without clearly carrying out asphalt in level
Power acts on the evaluation of lower shear behavior, and many test methods need expensive complete set of equipments, complicated for operation, such as Superpave
Simple shear test, triaxial compression test, direct shear test, rotational shear test etc.；Though other methods testing equipment is opposite
Simply, such as oblique scissor test and coaxial shear test, but shape to bitumen mixture specimen and size require special, are not suitable for
Core detection on site；And uniaxial penetration test, stress state complex distribution in test specimen, dyscalculia, and rigid pressure head
Load assignment differs larger with the non-homogeneous load action of tire, is unfavorable for practical application.
Summary of the invention
Technical problem to be solved by the present invention lies in it is horizontal to provide a kind of asphalt for considering local axial compressive force
Experiment on Shearing Resistance device and method can effectively simulate the stress form that wheel load acts on lower pavement structure Asphalt Mixture,
The influence under different pressures effect to Anti-Shear Characteristics of Asphalt Mixtures is studied by changing the size of local axial compressive force.
In order to solve the above technical problems, the present invention provides a kind of asphalt horizontal shear for considering local axial compressive force
Performance test apparatus, comprising: asphalt cylinder test specimen 1, circular steel cushion block 2, steel bushing 3, semi-circular shape pressure head 4, recessed
Shape pedestal 5, bolt 6 and scissor-like jack 7；1 diameter of asphalt cylinder test specimen is consistent with the internal diameter of steel bushing 3, and edge
Axis direction is horizontally placed at two steel bushings, 3 center；Two bolts 6 of steel bushing 3 are fixed on spill pedestal 5；Two circle of left and right
2 center of shape steel cushion block is aligned with test specimen center, and asphalt cylinder test specimen 1, circular steel cushion block 2, steel bushing 3 are coaxial；It cuts
Formula jack 7 is bolted on spill pedestal 5, is applied by circular steel cushion block 2 to asphalt cylinder test specimen 1
Local axial compressive force；Semi-circular shape pressure head 4 is put among asphalt cylinder test specimen 1, equidistant with left and right, semi-circular shape pressure
First 4 inside radius is consistent with 1 radius of asphalt cylinder test specimen, and the load of universal testing machine passes through semi-circular shape pressure head
4 uniformly transfer, and are applied in asphalt cylinder test specimen 1.
Preferably, the size of asphalt cylinder test specimen 1 are as follows: diameter 100mm, high 100~160mm.
Preferably, 2 diameter of circular steel cushion block is 40~60mm；Steel bushing 3 internal diameter 100mm, wide 30~50mm；Semi-circular shape
Pressure head 4 inside radius 50mm, wide 30~50mm.
Preferably, axial local pressure size is 0.7Mpa.
Correspondingly, a kind of asphalt horizontal shear method for testing performance for considering local axial compressive force, including it is as follows
Step:
(1) according to the gradation composition of asphalt to be detected and bitumen aggregate ratio, gyratory compaction molding φ 150mm ×
100~160mm bitumen mixture specimen, and fixed-size asphalt cylinder test specimen 1 is obtained by cutting, it is parallel to try
It tests number of test-pieces and is no less than 3；
(2) by experimental rig, i.e. two pieces of semi-circular shape pressure heads 4 of steel bushing 3, one of circular steel cushion block 2, two, with test specimen
The environmental cabinet inside holding of target temperature is put into togerther not less than 5 hours, and is no more than 12 hours；
(3) test specimen, circular steel cushion block, steel bushing and pressure head are taken out；Interleaving agent is smeared in 3 inner wall of steel bushing, by cylindrical body
Test specimen is fitted into steel bushing 3, and two steel bushings 3 is made to be located at test specimen two sides, and blending bolt 6, which is fixed in, to be placed on testing stand
On spill pedestal 5；A circular steel cushion block 2 is respectively put in test specimen two sides, and 2 center of steel cushion block is directed at test specimen middle position, with being fixed on
The pressure sensor that scissor-like jack 7 on spill pedestal 5 applies axial force to target value, at circular steel cushion block 2 to steel cushion block
Real-time display pressure size；Then semi-circular shape pressure head 4 the intermediate of test specimen is directed to place；Start universal testing machine,
It is further applied load by semi-circular shape pressure head 4 to test specimen under defined test temperature with given pace；
(4) during loading, data collection system automatically determines and draws record load-deformation curve, according to load-
The read peak load q of deformation curve, uses formulaThe shearing strength τ, r that asphalt is calculated are pitch
Mixture cylinder test specimen radius.
Preferably, in step (1), the size of asphalt cylinder test specimen 1 are as follows: diameter 100mm, high by 100~
160mm。
Preferably, 2 diameter of circular steel cushion block of step (2) is 40~60mm；Steel bushing 3 internal diameter 100mm, wide 30mm, it is wide
30~50mm；Semi-circular shape pressure head 4 inside radius 50mm, wide 30~50mm.
Preferably, the axial local pressure size of step (3) is 0.7Mpa.
The invention has the benefit that the present invention develops a kind of new side for evaluating asphalt horizontal shear performance
Method not only effectively simulates wheel load and acts on lower road surface by applying local axial compressive force to cylindrical bitumen mixture specimen
The stress form of structure Asphalt Mixture can also study different pressures effect by changing the size of local axial compressive force
Under influence to Anti-Shear Characteristics of Asphalt Mixtures；And the present invention is using being parallel to the loading form in the face of rolling, it can definitely
The horizontal shear performance for evaluating asphalt, obtains shearing strength τ.In addition, this test method is easier, operation is easy,
At low cost, applicability is stronger, is conducive to promote the use of.
Detailed description of the invention
Fig. 1 is experimental provision structural schematic diagram of the invention.
Fig. 2 is the asphalt horizontal shear performance test apparatus section signal of the local axial compressive force of consideration of the invention
Figure.
Fig. 3 is method flow schematic diagram of the invention.
Specific embodiment
As illustrated in fig. 1 and 2, a kind of asphalt horizontal shear performance test apparatus considering local axial compressive force, packet
It includes: asphalt cylinder test specimen 1, circular steel cushion block 2, steel bushing 3, semi-circular shape pressure head 4, spill pedestal 5,6 and of bolt
Scissor-like jack 7；1 diameter of asphalt cylinder test specimen is consistent with the internal diameter of steel bushing 3, and is horizontally placed in the axial direction
Two steel bushings, 3 center；Two bolts 6 of steel bushing 3 are fixed on spill pedestal 5；Left and right two circular steel cushion blocks, 2 center and examination
The alignment of part center, asphalt cylinder test specimen 1, circular steel cushion block 2, steel bushing 3 are coaxial；Scissor-like jack 7 is solid with bolt
On spill pedestal 5, local axial compressive force is applied to asphalt cylinder test specimen 1 by circular steel cushion block 2；Semicircle
Annular pressure head 4 is put among asphalt cylinder test specimen 1, equidistant with left and right, and 4 inside radius of semi-circular shape pressure head and pitch are mixed
It closes and expects that 1 radius of cylinder test specimen is consistent, the load of universal testing machine is uniformly transferred by semi-circular shape pressure head 4, is applied to
In asphalt cylinder test specimen 1.
As shown in figure 3, correspondingly, a kind of asphalt horizontal shear performance test side for considering local axial compressive force
Method includes the following steps:
(1) asphalt mixture rotary compactor shaping asphalt test specimen is used, is obtained by cutting fixed-size
Asphalt cylinder test specimen；
(2) by two pieces of circular steel cushion blocks, two steel bushings, a semi-circular shape pressure head is put into togerther target temperature with test specimen
The environmental cabinet inside holding of degree is not less than 5 hours, and is no more than 12 hours；
(3) before preparing load using universal testing machine, first by pressure head, steel cushion block, steel bushing, test specimen and scissors thousand
Jin top is accurately assembled by relative position, is placed in environment incubator, and temperature is controlled in target value ± 0.5 DEG C；
(4) starting universal testing machine is loaded, and during loading, data collection system is automatically determined and drawn
Load-deformation curve is recorded, by obtaining the shearing strength of asphalt to read load peak computational.
The size of asphalt cylinder test specimen 1 in step (1) are as follows: diameter 100mm, high 100~160mm.
2 diameter of circular steel cushion block in step (2) is 40~60mm；Steel bushing 3 internal diameter 100mm, wide 30~50mm；Semicircle
Annular pressure head 4 inside radius 50mm, wide 30~50mm.
The diameter of bitumen mixture specimen keeps 100mm constant, it is contemplated that the convenience of production and core boring sampling, test specimen
Height does not have to set fixed value, tentatively has chosen 100~160mm；For the diameter of steel cushion block, for the ease of local loading, tentatively
40~60mm is had chosen, steel pad thickness is then required without fixed, and 10~20mm is best；Steel bushing and semi-circular shape pressure head it is interior
Diameter must be then consistent with the diameter of bitumen mixture specimen, so still using 100mm, steel bushing outer diameter is also wanted without fixation
It asks, 105~110mm can be used；Finally the width of steel bushing and semi-circular shape pressure head, this width also without specific size,
It is not narrow or wide relative to test specimen as long as guaranteeing that compound test specimen is in by scissor state, so tentatively have chosen 30~
50mm。
Detailed process:
1. the preparation of bitumen mixture specimen
The gradation and bitumen aggregate ratio for the asphalt evaluated as needed, according to " highway engineering pitch and asphalt
Testing regulations " T0736-2011 (SGC method) gyratory compaction molding in JTG E20-2011Pitch
Compound test specimen, the porosity of test specimen are 4%, and it is 100mm that gyratory compaction test specimen after molding, which is cut into diameter, a height of
The cylinder specimen of 100mm.To cylinder test specimen top and bottom, whether level is detected, with vernier caliper in cruciform symmetry
4 directions measure cylinder test specimen height, as height on both sides difference be greater than 2mm when, this test specimen cancel, parallel test require examination
Part number is no less than 3.
2. the heat preservation of test specimen
Two pieces of circular steel cushion blocks, two steel bushings, a semi-circular shape load pressure head, put together with the test specimen that cutting obtains
Enter 60 DEG C of environmental cabinet inside holding not less than 5 hours, and be no more than 12 hours, pays attention to cannot leaning between test specimen too closely, less
Stackable placement.
3, shearing strength is tested
Take out test specimen, circular steel cushion block, steel bushing and pressure head.Smearing interleaving agent in steel bushing inner wall (prevents pitch from mixing
Material and inner wall adhesion), asphalt cylinder test specimen is fitted into steel bushing, so that two steel bushings is located at test specimen two sides, is used in combination
Bolt is fixed on the spill pedestal being placed on testing stand；A circular steel cushion block is respectively put in test specimen two sides, in steel cushion block
The heart is directed at test specimen middle position, applies the axial force of 0.7Mpa to steel cushion block with scissor-like jack to compress test specimen；It then will be partly
Placed among circular ring shape pressure head alignment test specimen (for the friction for avoiding semi-circular shape pressure head and steel bushing, it can be in steel bushing and pressure
Lubricant is smeared on head side wall, or reserves the gap 1~2mm between the two when installation), after being installed, adjust universal material
Testing machine environmental cabinet makes temperature control at 60 ± 0.5 DEG C；Finally, starting universal testing machine, under 60 DEG C of test temperature
It is further applied load by pressure head to test specimen with 1mm/min rate, data collection system automatically determines and draws record load-deformation song
Line.
4. the calculating of shearing strength
Record load-deformation curve is automatically determined and drawn according to data collection system, peak load q is obtained, by formula
(1) the shearing strength τ of asphalt is calculated.
Wherein: τ-shearing strength；Q- peak load；R- test specimen radius.
To sum up, the invention discloses a kind of asphalt horizontal shear performance test apparatus for considering local axial compressive force
And method, local compression form of the mixture under wheel load effect in bituminous pavement is simulated, and effectively to be parallel to
The detection of the horizontal shear performance of the loading method progress asphalt in face is rolled, stress form definitely, more can be intuitive
Shear behavior of the evaluation asphalt under horizontal force action, and testing equipment is simple, and operation is simple, at low cost, just
In popularization and use.
Although the present invention is illustrated and has been described with regard to preferred embodiment, it is understood by those skilled in the art that
Without departing from scope defined by the claims of the present invention, variations and modifications can be carried out to the present invention.
Claims (8)
1. a kind of asphalt horizontal shear performance test apparatus for considering local axial compressive force characterized by comprising drip
Green mixture cylinder test specimen (1), circular steel cushion block (2), steel bushing (3), semi-circular shape pressure head (4), spill pedestal (5), spiral shell
Bolt (6) and scissor-like jack (7)；Asphalt cylinder test specimen (1) diameter is consistent with the internal diameter of steel bushing (3), and along axis
Line direction is horizontally placed at two steel bushings (3) center；Two steel bushings (3) are fixed on spill pedestal (5) with bolt (6)；It is left
Right two circular steel cushion block (2) centers are aligned with test specimen center, asphalt cylinder test specimen (1), circular steel cushion block (2), steel
Sleeve (3) is coaxial；Scissor-like jack (7) is bolted on spill pedestal (5), by circular steel cushion block (2) to pitch
Mixture cylinder test specimen (1) applies local axial compressive force；Semi-circular shape pressure head (4) is put in asphalt cylinder test specimen
(1) intermediate, equidistant with left and right, semi-circular shape pressure head (4) inside radius is consistent with asphalt cylinder test specimen (1) radius, and ten thousand
The load of energy Material Testing Machine is uniformly transferred by semi-circular shape pressure head (4), is applied to asphalt cylinder test specimen (1)
On.
2. the asphalt horizontal shear performance test apparatus as described in claim 1 for considering local axial compressive force, special
Sign is, the size of asphalt cylinder test specimen (1) are as follows: diameter 100mm, high 100~160mm.
3. the asphalt horizontal shear performance test apparatus as described in claim 1 for considering local axial compressive force, special
Sign is that circular steel cushion block (2) diameter is 40~60mm；Steel bushing (3) internal diameter 100mm, wide 30~50mm；Semi-circular shape pressure head
(4) inside radius 50mm, wide 30~50mm.
4. the asphalt horizontal shear performance test apparatus as described in claim 1 for considering local axial compressive force, special
Sign is that axial local pressure size is 0.7Mpa.
5. a kind of asphalt horizontal shear method for testing performance for considering local axial compressive force, which is characterized in that including such as
Lower step:
(1) according to the gradation composition of asphalt to be detected and bitumen aggregate ratio, 150mm × 100 gyratory compaction molding φ~
160mm bitumen mixture specimen, and fixed-size asphalt cylinder test specimen (1), parallel test are obtained by cutting
Number of test-pieces is no less than 3；
(2) by experimental rig, i.e. two pieces of circular steel cushion blocks (2), two steel bushings (3), a semi-circular shape pressure head (4), with examination
Part was put into togerther the environmental cabinet inside holding of target temperature not less than 5 hours, and was no more than 12 hours；
(3) test specimen, circular steel cushion block, steel bushing and pressure head are taken out；Interleaving agent is smeared in steel bushing (3) inner wall, cylindrical body is tried
Part is fitted into steel bushing (3), and two steel bushings (3) is made to be located at test specimen two sides, and blending bolt (6), which is fixed in, is placed in testing stand
On spill pedestal (5) on；A circular steel cushion block (2) is respectively put in test specimen two sides, and steel cushion block (2) center is directed at test specimen interposition
It sets, axial force is applied to target value, circular steel cushion block to steel cushion block with the scissor-like jack (7) being fixed on spill pedestal (5)
(2) the pressure sensor real-time display pressure size at；Then by intermediate the placing of semi-circular shape pressure head (4) alignment test specimen；It opens
Dynamic universal testing machine, applies lotus to test specimen by semi-circular shape pressure head (4) with given pace under defined test temperature
It carries；
(4) during loading, data collection system automatically determines and draws record load-deformation curve, according to load-deformation
The read peak load q of curve, uses formulaThe shearing strength τ, r of asphalt is calculated as pitch mixing
Expect cylinder test specimen radius.
6. the asphalt horizontal shear method for testing performance as claimed in claim 5 for considering local axial compressive force, special
Sign is, in step (1), the size of asphalt cylinder test specimen (1) are as follows: diameter 100mm, high 100~160mm.
7. the asphalt horizontal shear method for testing performance as claimed in claim 5 for considering local axial compressive force, special
Sign is that circular steel cushion block (2) diameter is 40~60mm；Steel bushing (3) internal diameter 100mm, wide 30~50mm；Semi-circular shape pressure head
(4) inside radius 50mm, wide 30~50mm.
8. the asphalt horizontal shear method for testing performance as claimed in claim 5 for considering local axial compressive force, special
Sign is that the axial local pressure size of step (3) is 0.7Mpa.
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| CN108279188B (en) * | 2017-12-29 | 2021-07-16 | 哈尔滨工业大学 | Device for measuring electrochemical hydrogen permeation curve under tensile load |
| CN109490102B (en) * | 2018-12-07 | 2024-05-28 | 中铁四局集团有限公司 | Double-deck shear test device of bituminous mixture |
| CN111783269B (en) * | 2019-03-18 | 2024-01-12 | 山东高速集团有限公司 | Method for analyzing road gap structure blocking caused by dust raising based on discrete element |
| CN111175111B (en) * | 2020-03-02 | 2022-02-01 | 湘潭大学 | Clamp for shear test of asphalt concrete contact test piece and test method thereof |
| CN116593323B (en) * | 2023-07-19 | 2023-11-14 | 常州市建筑材料研究所有限公司 | Special detection device of building block brickwork shear strength |
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| JPS61259137A (en) * | 1985-05-14 | 1986-11-17 | Tanaka Kikinzoku Kogyo Kk | Automatic shearing strength testing machine |
| US5712431A (en) * | 1996-05-01 | 1998-01-27 | Endura-Tec Systems Corporation | Device and method for testing the shear response of a material in response to an applied force |
| CN102226745A (en) * | 2011-04-07 | 2011-10-26 | 河海大学 | Method and device for testing dynamic shear properties of aggregate-mortar transition region |
| CN202330186U (en) * | 2011-11-09 | 2012-07-11 | 西安科技大学 | Shear tester |
| CN102507342A (en) * | 2011-11-24 | 2012-06-20 | 长安大学 | Testing method and device for researching on shear property of asphalt mixture |
| CN203011784U (en) * | 2013-01-04 | 2013-06-19 | 南京工业大学 | Detection apparatus for inter-layer shearing strength of asphalt concrete layer |
| CN103323350A (en) * | 2013-05-20 | 2013-09-25 | 东南大学 | Asphalt mixture dynamic modulus testing method |
| CN204514733U (en) * | 2015-04-09 | 2015-07-29 | 长安大学 | A kind of bituminous pavement right cylinder test specimen interlayer pressurization boxshear apparatus |
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