CN113433009A - Road material fatigue strength testing device and testing method thereof - Google Patents
Road material fatigue strength testing device and testing method thereof Download PDFInfo
- Publication number
- CN113433009A CN113433009A CN202110672727.4A CN202110672727A CN113433009A CN 113433009 A CN113433009 A CN 113433009A CN 202110672727 A CN202110672727 A CN 202110672727A CN 113433009 A CN113433009 A CN 113433009A
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- 238000012360 testing method Methods 0.000 title claims abstract description 85
- 239000000463 material Substances 0.000 title claims abstract description 31
- 238000012544 monitoring process Methods 0.000 claims description 21
- 238000003825 pressing Methods 0.000 claims description 18
- 238000009661 fatigue test Methods 0.000 claims description 6
- 239000003822 epoxy resin Substances 0.000 claims description 3
- 238000010030 laminating Methods 0.000 claims description 3
- 229920000647 polyepoxide Polymers 0.000 claims description 3
- 241000826860 Trapezium Species 0.000 claims description 2
- 238000010998 test method Methods 0.000 claims description 2
- 238000001514 detection method Methods 0.000 abstract description 7
- 238000000034 method Methods 0.000 abstract description 4
- 238000004088 simulation Methods 0.000 abstract description 2
- 239000010426 asphalt Substances 0.000 description 5
- 238000005336 cracking Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000011384 asphalt concrete Substances 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 201000010099 disease Diseases 0.000 description 2
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000004567 concrete Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Classifications
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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
- G01N3/36—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces generated by pneumatic or hydraulic means
-
- 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
-
- 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
- G01N2203/003—Generation of the force
- G01N2203/0042—Pneumatic or hydraulic means
- G01N2203/0048—Hydraulic means
-
- 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
- G01N2203/0073—Fatigue
-
- 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
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/0658—Indicating or recording means; Sensing means using acoustic or ultrasonic detectors
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- 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 relates to the technical field of road material detection, and discloses a device and a method for testing fatigue strength of a road material, wherein the device comprises a test board assembly, the top of the test board assembly is provided with a liftable drop hammer assembly, the drop hammer assembly comprises a second lifting part, the telescopic end of the second lifting part is fixedly connected with an electromagnet, the top of the test board assembly is provided with a drop hammer slide rail, and the inner side wall of the drop hammer slide rail is connected with an impact block in a sliding manner; the bottom end of the drop hammer slide rail is provided with an impact assembly, the impact assembly comprises an impact column, and the bottom of the impact column is fixedly connected with a buffer seat; through setting up the hammer subassembly that falls and striking subassembly, the hammer subassembly that falls strikes the striking subassembly, makes four clamp plates in the striking post driven in step, and outwards exert pressure makes four clamp plates carry out even pressure application to the inner wall of test piece, makes the device simulation pressure that can be accurate exert the state, promotes the device's detection precision.
Description
Technical Field
The invention relates to the technical field of road material detection, in particular to a road material fatigue strength testing device and a testing method thereof.
Background
The road material comprises road and bridge engineering materials such as cement concrete, building mortar, inorganic binder stabilizing materials, asphalt mixture, building steel and the like, wherein the asphalt mixture is the most common road material.
The complexity of the effect of climate, vehicle load and environment on the asphalt concrete pavement and the characteristics of large-scale and heavy-load vehicles in recent years cause the asphalt concrete pavement structures to be damaged in different degrees often within the design years, and cause a great amount of material and financial loss. Among various diseases of asphalt pavements, fatigue cracking of pavement structures caused by repeated actions of vehicle loads is one of the more common disease types. In order to effectively prevent and treat fatigue cracking, a great deal of research work is carried out by road workers in various countries, and it is considered that the fatigue cracking of the road surface can be generally divided into three types, i.e., an open type, a shear type and a composite type. The open cracks are mainly caused by horizontal tensile stress of a pavement material under load, the shear cracks are mainly caused by multiple times of shear stress of the asphalt mixture, and the composite cracks are the result of the comprehensive action of the horizontal tensile stress and the shear stress.
At present, repeated pressure application is mostly adopted in the fatigue strength test of asphalt, pressure applied to a material by a vehicle is simulated to provide shear stress and tensile stress, and detection equipment is used for detection.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a device and a method for testing the fatigue strength of a road material, which have the advantage of uniformly applying pressure to the periphery of the inner wall of the material by using a drop hammer, and solve the problem that the detection precision of the material is influenced because the inner wall of the material cannot be effectively pressed when the material is applied with pressure in the prior art.
(II) technical scheme
In order to achieve the purpose, the invention provides the following technical scheme that the device for testing the fatigue strength of the road material comprises: the device comprises a test board assembly, wherein a liftable drop hammer assembly is arranged at the top of the test board assembly, the drop hammer assembly comprises a second lifting piece, an electromagnet is fixedly connected to the telescopic end of the second lifting piece, a drop hammer slide rail is arranged at the top of the test board assembly, and an impact block is slidably connected to the inner side wall of the drop hammer slide rail;
the bottom of the drop hammer slide rail is provided with an impact assembly, the impact assembly comprises an impact column, the bottom of the impact column is fixedly connected with a buffer seat, the inside of the impact column is movably connected with a pressing head, the pressing head is of a trapezoidal structure which gradually narrows from top to bottom, the top of the pressing head is fixedly connected with a connecting rod, the top end of the connecting rod is fixedly connected with a hammer head, the inner side wall of the impact column is slidably connected with a slide column, two ends of the slide column are respectively provided with a slide block and a press plate, and the slide block is close to the outer side of the pressing head.
Preferably, the test board assembly comprises a base, a stand column is fixedly connected to the top of the base, a first lifting part is fixedly connected to the top of the stand column, a cross beam is slidably connected to the outer side wall of the stand column, a test board is fixedly connected to the top of the base, support frames are arranged on two sides of the test board, and a test part is fixedly connected to the top of the test board.
Preferably, the top of the test board is fixedly connected with a pressure sensor.
By adopting the scheme, the pressure sensor detects the pressure applied to the test piece on the test board.
Preferably, the outer surface of the drop hammer slide rail is provided with scales.
Through adopting above-mentioned scheme, through setting up the scale, the person of facilitating the use observes the height of impact block.
Preferably, the number of the pressing plates is four, and the four pressing plates are distributed in a central symmetry mode according to the circle center of the pressing head.
By adopting the scheme, the four pressing plates synchronously press the periphery of the inner wall of the test piece, so that uniform tensile stress is generated in the test piece.
Preferably, the top of the support frame is provided with a pressurizing assembly, the pressurizing assembly comprises a first hydraulic cylinder, a telescopic end of the first hydraulic cylinder is fixedly connected with a pressurizing block, and the bottom surface of the pressurizing block is attached to the top of the test piece.
By adopting the scheme, after the test piece is fixed, the hydraulic cylinder drives the pressure applying block to apply pressure downwards to the test piece, so that shear stress is generated in the test piece, and a certain pressure is repeatedly applied through the hydraulic cylinder to perform a shear fatigue test.
Preferably, the monitoring assembly is installed to the inside wall of support frame, the monitoring assembly includes pneumatic cylinder two, the flexible end fixedly connected with monitoring head of pneumatic cylinder two, the lateral wall fixedly connected with ultrasonic flaw detector of monitoring head, one side of ultrasonic flaw detector with one side laminating of test piece.
Through adopting above-mentioned scheme, the outer wall contact of ultrasonic flaw detector on the pneumatic cylinder two drive monitoring head and test piece, and on the one hand the monitoring head supports the outer wall of test piece, and on the other hand ultrasonic flaw detector carries out real-time supervision to the crack.
A test method for testing the fatigue strength of a road material comprises the following steps:
s1: firstly, fixing a to-be-tested part above a test board by using epoxy resin;
s2: after the fixation is finished, a pressurizing assembly and a monitoring assembly are utilized to pressurize the upper part and the side edge of the test piece;
s3: the drop hammer component impacts the impact component;
s4: repeating the step S3 until the fatigue test is completed;
s5: and detecting the cracks of the test piece by using an ultrasonic flaw detector.
(III) advantageous effects
Compared with the prior art, the invention provides a device and a method for testing the fatigue strength of a road material, and the device and the method have the following beneficial effects:
through setting up the hammer subassembly that falls and striking subassembly, the hammer subassembly that falls strikes the striking subassembly, makes four clamp plates in the striking post driven in step, and outwards exert pressure makes four clamp plates carry out even pressure application to the inner wall of test piece, makes the device simulation pressure that can be accurate exert the state, promotes the device's detection precision.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of the drop hammer assembly of the present invention;
FIG. 3 is a schematic view of the construction of the impact assembly of the present invention;
FIG. 4 is a top cross-sectional view of the impact assembly of the present invention;
fig. 5 is a schematic structural view of a pressurizing assembly and a monitoring assembly according to the present invention.
In the figure: 10. a test stand component; 11. a base; 12. a column; 13. a first lifting piece; 14. a cross beam; 15. a test bench; 151. a pressure sensor; 16. a support frame; 17. testing the piece;
20. a drop hammer assembly; 21. a second lifting piece; 22. an electromagnet; 23. a drop hammer slide rail; 24. an impact block;
30. an impact assembly; 31. an impact post; 32. a buffer seat; 33. applying a pressure head; 34. a connecting rod; 35. a hammer head; 36. a traveler; 37. a slider; 38. pressing a plate;
40. a pressurizing assembly; 41. a first hydraulic cylinder; 42. pressing a block;
50. a monitoring component; 51. a second hydraulic cylinder; 52. a monitoring head; 53. an ultrasonic flaw detector.
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.
Example one
A road material fatigue strength testing device comprises a testing platform assembly 10, wherein the testing platform assembly 10 comprises a base 11, the top of the base 11 is fixedly connected with an upright post 12, the top of the upright post 12 is fixedly connected with a first lifting piece 13, the outer side wall of the upright post 12 is slidably connected with a cross beam 14, the top of the base 11 is fixedly connected with a testing platform 15, the top of the testing platform 15 is fixedly connected with a pressure sensor 151, two sides of the testing platform 15 are provided with supporting frames 16, the top of the testing platform 15 is fixedly connected with a testing piece 17, the top of the testing platform assembly 10 is provided with a liftable drop hammer assembly 20, the drop hammer assembly 20 comprises a second lifting piece 21, the telescopic end of the second lifting piece 21 is fixedly connected with an electromagnet 22, the top of the testing platform assembly 10 is provided with a drop hammer slide rail 23, the outer surface of the drop hammer slide rail 23 is provided with scales, and the inner side wall of the drop hammer slide rail 23 is slidably connected with an impact block 24;
Referring to fig. 1-4, firstly, fixing a to-be-tested object 17 above a test bench 15 by using epoxy resin, and after the fixing is completed, controlling a first hydraulic cylinder 41 and a second hydraulic cylinder 51 to work, so that a pressure applying block 42 and a monitoring head 52 respectively apply pressure to the top and the side of the to-be-tested object 17;
at the moment, the first lifting piece 13 is started again, the first lifting piece 13 drives the beam 14 to ascend, the beam 14 drives the second lifting piece 21 to ascend, the electromagnet 22 on the second lifting piece 21 adsorbs the impact block 24, the impact block 24 is driven to the upper end of the drop hammer slide rail 23, after a certain height is reached, the power supply of the electromagnet 22 is disconnected, the electromagnet 22 does not adsorb the impact block 24 any more, the impact block 24 falls to impact the hammer head 35, the pressing head 33 on the hammer head 35 is pressed downwards, the pressing head 33 presses the sliding blocks 37 on two sides again, the sliding blocks 37 press the pressing plate 38 through the sliding columns 36, and finally the pressing plate 38 presses the inner wall of the test piece 17;
finally, the above operations are repeated, and after the test is completed, the ultrasonic flaw detector 53 is used to detect the flaws of the test piece.
Example two
Referring to fig. 5, after the test piece 17 is fixed, the first hydraulic cylinder 41 drives the pressure applying block 42 to apply pressure downwards to the test piece 17, so that shear stress is generated in the test piece 17, and a certain pressure is repeatedly applied through the first hydraulic cylinder 41 to perform a shear fatigue test, so that the shear fatigue test and a tensile stress fatigue test can be performed synchronously by the device;
the second hydraulic cylinder 51 drives the ultrasonic flaw detector 53 on the monitoring head 52 to contact with the outer wall of the test piece 17, on one hand, the monitoring head 52 supports the outer wall of the test piece 17, and on the other hand, the ultrasonic flaw detector 53 monitors cracks in real time.
In this embodiment, the ultrasonic flaw detector 53 is of the type GUN 30.
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 (8)
1. The utility model provides a road material fatigue strength testing arrangement, includes testboard subassembly (10), its characterized in that: a liftable drop hammer assembly (20) is arranged at the top of the test platform assembly (10), the drop hammer assembly (20) comprises a second lifting piece (21), an electromagnet (22) is fixedly connected to the telescopic end of the second lifting piece (21), a drop hammer slide rail (23) is installed at the top of the test platform assembly (10), and an impact block (24) is slidably connected to the inner side wall of the drop hammer slide rail (23);
striking subassembly (30) are installed to the bottom of drop hammer slide rail (23), striking subassembly (30) include striking post (31), the bottom fixedly connected with cushion socket (32) of striking post (31), the inside swing joint of striking post (31) has pressure applying head (33), pressure applying head (33) are the trapezium structure that narrows down gradually from top to bottom, the top fixedly connected with connecting rod (34) of pressure applying head (33), the top fixedly connected with tup (35) of connecting rod (34), the inside wall sliding connection of striking post (31) has traveller (36), the both ends of traveller (36) are equipped with slider (37) and clamp plate (38) respectively, slider (37) are close to in the outside of pressure applying head (33).
2. The device for testing the fatigue strength of the road material according to claim 1, wherein: the test bench component (10) comprises a base (11), a stand column (12) is fixedly connected to the top of the base (11), a first lifting part (13) is fixedly connected to the top of the stand column (12), a cross beam (14) is slidably connected to the outer side wall of the stand column (12), a test bench (15) is fixedly connected to the top of the base (11), support frames (16) are arranged on two sides of the test bench (15), and a test part (17) is fixedly connected to the top of the test bench (15).
3. The device for testing the fatigue strength of the road material according to claim 2, wherein: the top of the test bench (15) is fixedly connected with a pressure sensor (151).
4. The device for testing the fatigue strength of the road material according to claim 1, wherein: the outer surface of the drop hammer slide rail (23) is provided with scales.
5. The device for testing the fatigue strength of the road material according to claim 1, wherein: the number of the pressing plates (38) is four, and the four pressing plates (38) are distributed in a centrosymmetric mode according to the circle center of the pressing head (33).
6. The device for testing the fatigue strength of the road material according to claim 2, wherein: the top of the support frame (16) is provided with a pressurizing assembly (40), the pressurizing assembly (40) comprises a first hydraulic cylinder (41), the telescopic end of the first hydraulic cylinder (41) is fixedly connected with a pressurizing block (42), and the bottom surface of the pressurizing block (42) is attached to the top of the test piece (17).
7. The device for testing the fatigue strength of the road material according to claim 2, wherein: monitoring subassembly (50) are installed to the inside wall of support frame (16), monitoring subassembly (50) include pneumatic cylinder two (51), the flexible end fixedly connected with monitoring head (52) of pneumatic cylinder two (51), the lateral wall fixedly connected with ultrasonic flaw detector (53) of monitoring head (52), one side of ultrasonic flaw detector (53) with one side laminating of test piece (17).
8. A road material fatigue strength test method, a road material fatigue strength test apparatus according to any one of claims 1 to 7, characterized by comprising the steps of:
s1: firstly, fixing a to-be-tested part above a test board by using epoxy resin;
s2: after the fixation is finished, a pressurizing assembly and a monitoring assembly are utilized to pressurize the upper part and the side edge of the test piece;
s3: the drop hammer component impacts the impact component;
s4: repeating the step S3 until the fatigue test is completed;
s5: and detecting the cracks of the test piece by using an ultrasonic flaw detector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110672727.4A CN113433009A (en) | 2021-06-17 | 2021-06-17 | Road material fatigue strength testing device and testing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110672727.4A CN113433009A (en) | 2021-06-17 | 2021-06-17 | Road material fatigue strength testing device and testing method thereof |
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| Publication Number | Publication Date |
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| CN113433009A true CN113433009A (en) | 2021-09-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110672727.4A Pending CN113433009A (en) | 2021-06-17 | 2021-06-17 | Road material fatigue strength testing device and testing method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114235605A (en) * | 2021-12-23 | 2022-03-25 | 国网甘肃省电力公司经济技术研究院 | Intelligent concrete stress analysis system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202372417U (en) * | 2011-12-21 | 2012-08-08 | 西安科技大学 | Road material strength parameter tester based on live load |
| CN202485999U (en) * | 2011-12-21 | 2012-10-10 | 西安科技大学 | Drop hammer type road material fatigue strength tester |
| CN106969991A (en) * | 2017-03-31 | 2017-07-21 | 长安大学 | A kind of bituminous paving repeated impact test device |
| CN108362579A (en) * | 2018-05-25 | 2018-08-03 | 中国电建集团成都勘测设计研究院有限公司 | Portable rock mass direct shearing test device |
| CN207832595U (en) * | 2017-12-29 | 2018-09-07 | 太和县通达木业有限公司 | A kind of device for detecting performance producing plank |
| CN210513983U (en) * | 2019-05-08 | 2020-05-12 | 贵州中科建业工程质量检测咨询(中心)有限公司 | A percussion device for testing cement bearing capacity |
| CN211477865U (en) * | 2020-01-11 | 2020-09-11 | 广西云鹰建材有限公司 | Concrete compressive strength detection device |
| CN211784761U (en) * | 2020-01-08 | 2020-10-27 | 新疆维吾尔自治区交通规划勘察设计研究院 | Multifunctional road material shear strength test fixture |
-
2021
- 2021-06-17 CN CN202110672727.4A patent/CN113433009A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202372417U (en) * | 2011-12-21 | 2012-08-08 | 西安科技大学 | Road material strength parameter tester based on live load |
| CN202485999U (en) * | 2011-12-21 | 2012-10-10 | 西安科技大学 | Drop hammer type road material fatigue strength tester |
| CN106969991A (en) * | 2017-03-31 | 2017-07-21 | 长安大学 | A kind of bituminous paving repeated impact test device |
| CN207832595U (en) * | 2017-12-29 | 2018-09-07 | 太和县通达木业有限公司 | A kind of device for detecting performance producing plank |
| CN108362579A (en) * | 2018-05-25 | 2018-08-03 | 中国电建集团成都勘测设计研究院有限公司 | Portable rock mass direct shearing test device |
| CN210513983U (en) * | 2019-05-08 | 2020-05-12 | 贵州中科建业工程质量检测咨询(中心)有限公司 | A percussion device for testing cement bearing capacity |
| CN211784761U (en) * | 2020-01-08 | 2020-10-27 | 新疆维吾尔自治区交通规划勘察设计研究院 | Multifunctional road material shear strength test fixture |
| CN211477865U (en) * | 2020-01-11 | 2020-09-11 | 广西云鹰建材有限公司 | Concrete compressive strength detection device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114235605A (en) * | 2021-12-23 | 2022-03-25 | 国网甘肃省电力公司经济技术研究院 | Intelligent concrete stress analysis system |
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Application publication date: 20210924 |