CN106840916A - A kind of experimental rig and method for testing asphalt material shearing strength - Google Patents
A kind of experimental rig and method for testing asphalt material shearing strength Download PDFInfo
- Publication number
- CN106840916A CN106840916A CN201611180723.XA CN201611180723A CN106840916A CN 106840916 A CN106840916 A CN 106840916A CN 201611180723 A CN201611180723 A CN 201611180723A CN 106840916 A CN106840916 A CN 106840916A
- Authority
- CN
- China
- Prior art keywords
- cutting head
- headstock
- asphalt material
- power transmission
- transmission shaft
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000010008 shearing Methods 0.000 title claims abstract description 61
- 239000000463 material Substances 0.000 title claims abstract description 54
- 239000010426 asphalt Substances 0.000 title claims abstract description 51
- 238000012360 testing method Methods 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 title abstract description 16
- 230000005540 biological transmission Effects 0.000 claims abstract description 38
- 230000007613 environmental effect Effects 0.000 claims abstract description 14
- 238000011897 real-time detection Methods 0.000 claims description 4
- 230000000903 blocking effect Effects 0.000 claims description 3
- 238000010998 test method Methods 0.000 claims description 3
- 238000007689 inspection Methods 0.000 claims 1
- 239000011275 tar sand Substances 0.000 abstract description 8
- 239000000203 mixture Substances 0.000 description 5
- 238000002474 experimental method Methods 0.000 description 4
- 238000011160 research Methods 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000010309 melting process Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 238000009987 spinning Methods 0.000 description 1
Classifications
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention discloses a kind of experimental rig and method for testing asphalt material shearing strength, including controller, environmental cabinet and the supporting plate in environmental cabinet, column, die trial, headstock, power transmission shaft, telescopic tube and cutting head；Supporting plate is fixed on the bottom of environmental cabinet, the lower end of column and die trial are fixed in supporting plate, headstock is fixed on the upper end of column, asphalt material to be tested is filled in die trial, the upper end of power transmission shaft is connected with the output shaft of headstock, the lower end of power transmission shaft is inserted in asphalt material to be tested, and cutting head is fixed on the lower end of power transmission shaft, the detecting system for measuring shearing moment that cutting head is subject to and shear stress is provided with headstock, telescopic tube is socketed on the outer wall of power transmission shaft, controller is connected with the control end of headstock and the output end of detecting system, the device and method can accurately measure the shearing strength of pitch and tar sand material.
Description
Technical field
The present invention relates to the experimental rig and method of a kind of shearing strength, and in particular to one kind test asphalt material shearing resistance is strong
The experimental rig and method of degree.
Background technology
In road engineering, the failure mode of bituminous paving is varied, and reason is not quite similar, its Asphalt Mixture
Strength and stability served it is vital, because in the pavement damage that causes compound is destroyed, key factor is in mixed
Close the failure by shear of material, the failure by shear of wherein compound is mainly pitch failure by shear in itself and asphalt and aggregate contact
The shearing on surface is peeled off.
Bituminous concrete is by pitch, gather materials the complex system that is constituted with space, after introducing tar sand concept, the system
Coarse aggregate, tar sand and space can be then simplified to, wherein, tar sand is made up of pitch matrix and below 2.36mm fine aggregates, because
The shearing strength of this research pitch and tar sand is of great importance for analysis performance of asphalt mixture.
Existing shear and method lay particular emphasis on grinding for shear stress and deformation mainly in asphalt
Study carefully, common shearing test has triaxial test, Superpave shearing tests, oblique scissor test, uniaxial penetration test, hollow at present
Cylinder shearing test and coaxial shear experiment etc..When Research on Asphalt Mixture shear stress is with deformation, the above method respectively has excellent
Shortcoming, the above method is not particularly suited for studying merely the shearing strength of pitch and tar sand material.
The content of the invention
Shortcoming it is an object of the invention to overcome above-mentioned prior art, there is provided one kind test asphalt material shearing strength
Experimental rig and method, the device and method can accurately measure the shearing strength of pitch and tar sand material.
To reach above-mentioned purpose, the experimental rig of test asphalt material shearing strength of the present invention include controller,
Environmental cabinet and the supporting plate in environmental cabinet, column, die trial, headstock, power transmission shaft, telescopic tube and cutting head；
Supporting plate is fixed on the bottom of environmental cabinet, and the lower end of column and die trial are fixed in supporting plate, and headstock is fixed on
The upper end of column, asphalt material to be tested is filled in die trial, and the upper end of power transmission shaft is connected with the output shaft of headstock, transmission
The lower end of axle is inserted in asphalt material to be tested, and cutting head is fixed on the lower end of power transmission shaft, is provided with for surveying in headstock
The detecting system of shearing moment that amount cutting head is subject to, telescopic tube is socketed on the outer wall of power transmission shaft, controller and headstock
Control end and the output end of detecting system be connected.
The controller includes display and console, and console is connected with display, detecting system and headstock.
The upper end of telescopic tube is connected through a screw thread with the bottom of headstock.
The side of power transmission shaft lower end is provided with the projection of needle-like, and the outer wall of telescopic tube is provided with what is be engaged with the projection
Through hole, projection is embedded in the through hole, and the outer wall of telescopic tube is provided with the stopple for blocking the through hole.
The cutting head is cross cutting head, conical cutting head or spindle cutting head.
It is connected through a screw thread between cutting head and power transmission shaft.
Column is fixed in supporting plate by base.
The test method of test asphalt material shearing strength of the present invention is comprised the following steps：
Controller control headstock is operated, and headstock drives drive axis, power transmission shaft to drive cutting head waiting to try
Test in asphalt material and sheared, shearing moment and shear stress that detecting system real-time detection cutting head is subject to, and by cutting head
The shearing moment being subject to is sent into controller, and controller is bent according to the moment of torsion that the shearing moment that cutting head is subject to draws cutting head
Line, when peak value occurs in the torque curve of cutting head, controller control headstock is stopped, moment of torsion of the controller according to cutting head
Shearing moment when peak value occurs in curve calculates the shearing strength of asphalt material to be tested.
The invention has the advantages that：
It is of the present invention test asphalt material shearing strength experimental rig and method in concrete operations, using actively
The method of shearing, drives cutting head to be sheared in asphalt material to be tested, while passing through using headstock by power transmission shaft
The shearing moment that detecting system real-time detection cutting head is subject to, and draw the torque curve of cutting head, then controller is according to cutting
The torque curve of crop reaches the shearing strength that corresponding shearing moment during peak value calculates asphalt material to be tested, simple to operate,
Can be applied to including the various asphalt materials including pitch and tar sand material, using relatively broad.
Brief description of the drawings
Fig. 1 is structural representation of the invention；
Fig. 2 is the structural representation of controller in the present invention.
Wherein, 1 it is headstock, 2 be power transmission shaft, 3 be telescopic tube, 4 be asphalt material to be tested, 5 be cutting head, 6 is
Data wire, 7 be column, 8 be die trial, 9 be base, 10 be supporting plate, 11 be environmental cabinet, 12 be console, 13 be display.
Specific embodiment
The present invention is described in further detail below in conjunction with the accompanying drawings：
With reference to Fig. 1, the experimental rig of test asphalt material shearing strength of the present invention includes controller, environmental cabinet 11
And supporting plate 10 in environmental cabinet 11, column 7, die trial 8, headstock 1, power transmission shaft 2, telescopic tube 3 and cutting head 5；
Supporting plate 10 is fixed on the bottom of environmental cabinet 11, and the lower end of column 7 and die trial 8 are fixed in supporting plate 10, and headstock 1 is fixed on
The upper end of column 7, asphalt material to be tested 4 is filled in die trial 8, and the upper end of power transmission shaft 2 is connected with the output shaft of headstock 1
Connect, the lower end of power transmission shaft 2 is inserted in asphalt material to be tested 4, and cutting head 5 is fixed on the lower end of power transmission shaft 2, headstock 1
The detecting system for measuring the shearing moment that cutting head 5 is subject to inside is provided with, telescopic tube 3 is socketed on the outer wall of power transmission shaft 2,
Controller is connected with the control end of headstock 1 and the output end of detecting system.
The controller includes display 13 and console 12, console 12 and display 13, detecting system and headstock 1
It is connected；The upper end of telescopic tube 3 is connected through a screw thread with the bottom of headstock 1；The side of the lower end of power transmission shaft 2 is provided with needle-like
Projection, the outer wall of telescopic tube 3 is provided with the through hole being engaged with the projection, and projection is embedded in the through hole, telescopic
The outer wall of pipe 3 is provided with the stopple for blocking the through hole；Cutting head 5 is cross cutting head, conical cutting head or spinning
Capitate cutting head；It is connected through a screw thread between cutting head 5 and power transmission shaft 2；Column 7 is fixed in supporting plate 10 by base 9.
The test method of test asphalt material shearing strength of the present invention is comprised the following steps：
Controller control headstock 1 is operated, and headstock 1 drives power transmission shaft 2 to rotate, and power transmission shaft 2 drives cutting head 5 to exist
Sheared in asphalt material to be tested 4, the shearing moment that detecting system real-time detection cutting head 5 is subject to, and cutting head 5 is received
To shearing moment send into controller, the moment of torsion that the shearing moment that controller is subject to according to cutting head 5 draws cutting head 5 is bent
Line, when peak value occurs in the torque curve of cutting head 5, controller control headstock 1 is stopped, and now controller is according to cutting head
Shearing moment when peak value occurs in 5 torque curve calculates the shearing strength of asphalt material 4 to be tested.
Detecting system is connected by data wire 6 with controller.
The power of headstock 1 comes from external power source, and carrying out transmission by gear rotates power transmission shaft 2, and the outside of power transmission shaft 2 is
Design of gears, shears under the drive of driving gear to asphalt material to be tested 4；The Main Function of telescopic tube 3 be by
Power transmission shaft 2 and external environs are opened, and on the one hand ensure the cleaning of inner drive shafts 2, on the other hand can reduce drip in experiment
The contact of green material and power transmission shaft 2, so as to reduce the energy consumption in addition to shear action, improves test accuracy, and telescopic tube 3 can root
According to needing to be stretched up and down, in test, each section sleeve pipe is naturally drooped.
Column 7 bears to be delivered to the moment of torsion on headstock 1 by cutting head 5 in shear history perpendicular to base 9；Die trial 8
With high-temperature stability, can be used for the heating and melting process of asphalt material.The inwall of die trial 8 should be cleaned, can in process of the test
Pitch and other detected materials are made to adhere to well, so as to ensure that rotational shear first 5 can cut into asphalt material to be tested 4
Type.
The base of die trial 8 uses rectangular design, and its size is suitable with the bayonet socket size of base 9, then die trial 8 can be with the phase of base 9
Agree with, so as to ensure that die trial 8 is fixed in process of the test；Environmental cabinet 11 can provide different temperature environments, and simulation is actual
In under different temperature pitch state and performance, the shearing strength for determining pitch under condition of different temperatures.
When cutting head 5 is cross cutting head 5, if the moment of torsion applied during pitch failure by shear is M, then it should be with
Moment of resistance produced by the shearing strength of failure by shear cylindrical side and cylinder top and bottom pitch is equal, i.e.,：
Wherein, τSideAnd τBottomRespectively failure by shear when cylindrical sides and upper and lower bottom surface pitch shearing strength (kPa)；H
It is the height (m) of cross cutting head；D is the diameter (m) of cross cutting head.
If the asphalt material under normal temperature is isotropic, i.e. τSide=τBottom, and it is denoted as τAlways, then above formula can be write as：
Wherein, τAlwaysIt is the shearing strength (kPa) of the asphalt material that cross cutting head is determined.
When cutting head 5 is conical cutting head, if the moment of torsion applied during pitch failure by shear is M, then cone is cut
Crop 5 should be equal with the moment of resistance produced by the shearing strength of failure by shear conical side surface and circular cone bottom surface pitch, i.e.,：
Wherein, τSideAnd τBottomRespectively failure by shear when circular cone body side surface and bottom surface pitch shearing strength (kPa)；H is circle
The height (m) of taper cutting head；D is the diameter (m) of conical cutting head.
If the asphalt material under normal temperature is isotropic, i.e. τSide=τBottom, and it is denoted as τAlways, then have
Wherein, τAlwaysIt is the shearing strength (kPa) of the asphalt material that conical cutting head is determined.
When cutting head 5 is spindle cutting head, if the moment of torsion applied during pitch failure by shear is M, then it should be with
Moment of resistance produced by the cylindrical side of failure by shear spindle and the shearing strength of taper bottom surface pitch is equal, i.e.,：
Wherein, τSide、τBottomRespectively failure by shear when spindle body side surface and bottom surface pitch shearing strength (kPa)；H is spindle
The height (m) of shape cutting head 5；H is the cylindrical portion of spindle cutting head 5 height (m)；D is the diameter of spindle cutting head 5
(m)。
If the asphalt material under normal temperature is isotropic, i.e. τSide=τBottom, and it is denoted as τAlways, then have
Wherein, τAlwaysIt is the shearing strength (kPa) of the pitch that spindle cutting head is determined.
It should be noted that the present invention has broken the unicity for being absorbed in Research on Asphalt Mixture shear behavior in the past, have
Help the basic factor of research influence shear strength of asphalt mixture；The automation of experimental rig shear history is realized simultaneously,
The manual old model of traditional boxshear apparatus is instead of, test operation is easier, and test data is more accurate.And in traditional soil
Improved on the basis of work vane apparatus, and screwed it the three-stage telescopic tube that dismounting sleeve pipe is changed to upward lifting
3, it is to avoid each experiment will dismantle the complicated procedures of sleeve pipe after completing, simplify operation.In addition, experiment material therefor examination
Mould 8 is detachable kind of design, the wall of die trial 8 can be separated with back cover lid after off-test, is convenient to clean out consolidating in die trial 8
Body pitch.
Claims (8)
1. it is a kind of test asphalt material shearing strength experimental rig, it is characterised in that including controller, environmental cabinet (11) and
Supporting plate (10), column (7) in environmental cabinet (11), die trial (8), headstock (1), power transmission shaft (2), telescopic tube (3)
And cutting head (5)；Supporting plate (10) is fixed on the bottom of environmental cabinet (11), and support is fixed in the lower end of column (7) and die trial (8)
On plate (10), headstock (1) is fixed on the upper end of column (7), and asphalt material (4) to be tested is filled in die trial (8), power transmission shaft
(2) upper end is connected with the output shaft of headstock (1), and the lower end of power transmission shaft (2) is inserted in asphalt material to be tested (4),
And cutting head (5) is fixed in the lower end of power transmission shaft (2), headstock (1) and is provided with for measuring the shearing force that cutting head (5) is subject to
The detecting system of square, telescopic tube (3) is socketed on the outer wall of power transmission shaft (2), the control end and inspection of controller and headstock (1)
The output end of examining system is connected.
2. it is according to claim 1 test asphalt material shearing strength experimental rig, it is characterised in that the controller
Including display (13) and console (12), console (12) is connected with display (13), detecting system and headstock (1).
3. it is according to claim 1 test asphalt material shearing strength experimental rig, it is characterised in that telescopic tube
(3) upper end is connected through a screw thread with the bottom of headstock (1).
4. it is according to claim 1 test asphalt material shearing strength experimental rig, it is characterised in that power transmission shaft (2)
The side of lower end is provided with the projection of needle-like, and the outer wall of telescopic tube (3) is provided with the through hole being engaged with the projection, raised interior
It is embedded in the through hole, the outer wall of telescopic tube (3) is provided with the stopple for blocking the through hole.
5. it is according to claim 1 test asphalt material shearing strength experimental rig, it is characterised in that the cutting head
(5) be cross cutting head, conical cutting head or spindle cutting head.
6. it is according to claim 1 test asphalt material shearing strength experimental rig, it is characterised in that cutting head (5)
It is connected through a screw thread between power transmission shaft (2).
7. it is according to claim 1 test asphalt material shearing strength experimental rig, it is characterised in that column (7) lead to
Base (9) is crossed to be fixed in supporting plate (10).
8. it is a kind of test asphalt material shearing strength test method, it is characterised in that based on described in claim 1 test drip
The experimental rig of green material shearing strength, comprises the following steps：
Controller controls headstock (1) to be operated, and headstock (1) drives power transmission shaft (2) to rotate, and power transmission shaft (2) drives shearing
Head (5) is sheared in asphalt material to be tested (4), the shearing moment that detecting system real-time detection cutting head (5) is subject to, and
The shearing moment that cutting head (5) is subject to is sent into controller, controller is drawn according to the shearing moment that cutting head (5) is subject to
The torque curve of cutting head (5), when peak value occurs in the torque curve of cutting head (5), controller controls headstock (1) to stop work
Make, shearing moment when controller occurs peak value according to the torque curve of cutting head (5) calculates the anti-of asphalt material (4) to be tested
Cut intensity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611180723.XA CN106840916B (en) | 2016-12-19 | 2016-12-19 | Test device and method for testing shear strength of asphalt material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611180723.XA CN106840916B (en) | 2016-12-19 | 2016-12-19 | Test device and method for testing shear strength of asphalt material |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106840916A true CN106840916A (en) | 2017-06-13 |
| CN106840916B CN106840916B (en) | 2020-06-09 |
Family
ID=59140582
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611180723.XA Active CN106840916B (en) | 2016-12-19 | 2016-12-19 | Test device and method for testing shear strength of asphalt material |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106840916B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110836826A (en) * | 2019-11-08 | 2020-02-25 | 南京理工大学 | Scouring device and method for testing shear stress of concrete surface under action of water flow |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2330431A1 (en) * | 2001-01-08 | 2002-07-08 | Stephen Norman Goodman | In situ shear strength test facility |
| CN102109442A (en) * | 2010-12-21 | 2011-06-29 | 东南大学 | Fast test method of shearing resistance of bituminous mixture |
| JP2013019456A (en) * | 2011-07-11 | 2013-01-31 | Yazaki Corp | Insert collar |
| CN103149068A (en) * | 2013-03-07 | 2013-06-12 | 珠海市丽拓发展有限公司 | Leucorrhea, defecate and urine routine microscope examination slide making kit |
| CN103217344A (en) * | 2013-03-19 | 2013-07-24 | 西安建筑科技大学 | On-site measuring device for concrete strength |
| CN105445119A (en) * | 2015-11-13 | 2016-03-30 | 长安大学 | Device and method for testing torsion resistance and shear performance of bituminous mixture |
| CN205138951U (en) * | 2015-09-07 | 2016-04-06 | 厦门华特集团有限公司 | Multi -functional warm mix asphalt mixture shear flow resistance tester |
-
2016
- 2016-12-19 CN CN201611180723.XA patent/CN106840916B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2330431A1 (en) * | 2001-01-08 | 2002-07-08 | Stephen Norman Goodman | In situ shear strength test facility |
| CN102109442A (en) * | 2010-12-21 | 2011-06-29 | 东南大学 | Fast test method of shearing resistance of bituminous mixture |
| JP2013019456A (en) * | 2011-07-11 | 2013-01-31 | Yazaki Corp | Insert collar |
| CN103149068A (en) * | 2013-03-07 | 2013-06-12 | 珠海市丽拓发展有限公司 | Leucorrhea, defecate and urine routine microscope examination slide making kit |
| CN103217344A (en) * | 2013-03-19 | 2013-07-24 | 西安建筑科技大学 | On-site measuring device for concrete strength |
| CN205138951U (en) * | 2015-09-07 | 2016-04-06 | 厦门华特集团有限公司 | Multi -functional warm mix asphalt mixture shear flow resistance tester |
| CN105445119A (en) * | 2015-11-13 | 2016-03-30 | 长安大学 | Device and method for testing torsion resistance and shear performance of bituminous mixture |
Non-Patent Citations (3)
| Title |
|---|
| E. CASAL等: "Influence of porosity on the apparent interlaminar shear strengthof pitch-based unidirectional C–C composites", 《CARBON》 * |
| 李玉华等: "沥青混合料抗剪强度参数确定的纯扭-纯压试验方法", 《沈阳大学学报》 * |
| 王滨生等: "《土力学与地基基础》", 31 May 2015 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110836826A (en) * | 2019-11-08 | 2020-02-25 | 南京理工大学 | Scouring device and method for testing shear stress of concrete surface under action of water flow |
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| Publication number | Publication date |
|---|---|
| CN106840916B (en) | 2020-06-09 |
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Effective date of registration: 20200812 Address after: 710064 Shaanxi province Xi'an Beilin District South Second Ring Road No. 33 in the middle Co-patentee after: Jilin Expressway Group Co., Ltd Patentee after: CHANG'AN University Address before: 710064 Shaanxi province Xi'an Beilin District South Second Ring Road No. 33 in the middle Patentee before: CHANG'AN University |
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