CN217332013U - Road surface crack resistance test device for simulating load and temperature coupling effect - Google Patents
Road surface crack resistance test device for simulating load and temperature coupling effect Download PDFInfo
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- CN217332013U CN217332013U CN202220910052.2U CN202220910052U CN217332013U CN 217332013 U CN217332013 U CN 217332013U CN 202220910052 U CN202220910052 U CN 202220910052U CN 217332013 U CN217332013 U CN 217332013U
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- 238000012360 testing method Methods 0.000 title claims abstract description 63
- 230000001808 coupling effect Effects 0.000 title claims description 9
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 32
- 239000010959 steel Substances 0.000 claims abstract description 32
- 238000006073 displacement reaction Methods 0.000 claims abstract description 24
- 239000004744 fabric Substances 0.000 claims abstract description 8
- 238000004088 simulation Methods 0.000 claims abstract description 6
- 239000010426 asphalt Substances 0.000 claims description 20
- 239000004746 geotextile Substances 0.000 claims description 14
- 239000002344 surface layer Substances 0.000 claims description 12
- 239000010410 layer Substances 0.000 claims description 11
- 239000004743 Polypropylene Substances 0.000 claims description 3
- 239000004745 nonwoven fabric Substances 0.000 claims description 3
- -1 polypropylene Polymers 0.000 claims description 3
- 229920001155 polypropylene Polymers 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 7
- 230000008878 coupling Effects 0.000 abstract description 3
- 238000010168 coupling process Methods 0.000 abstract description 3
- 238000005859 coupling reaction Methods 0.000 abstract description 3
- 238000011056 performance test Methods 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 9
- 230000008569 process Effects 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 244000137852 Petrea volubilis Species 0.000 description 1
- 238000004873 anchoring Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000009958 sewing Methods 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/60—Planning or developing urban green infrastructure
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- Road Paving Structures (AREA)
Abstract
The utility model relates to a simulation load and temperature coupling's anti performance test device that splits of road surface, include steel base, rubber slab, test piece, rubber pad and the steel sheet that upwards stacks in proper order down, the test piece is from upwards including semi-rigid basic unit, geotechnological cloth and pitch surface course in proper order down, and geotechnological cloth bonds between semi-rigid basic unit and pitch surface course, is equipped with the prefabricated crack that extends along its minor axis direction in the middle of the bottom of semi-rigid basic unit, and the rubber slab has two, and two the rubber slab is about prefabricated crack symmetry, and the side of pitch surface course is located prefabricated cracked top and installs displacement sensor to displacement sensor is about prefabricated crack symmetry. The beneficial effects are that: compared with the prior art, the utility model, easy operation, the method science, economic nature is strong.
Description
Technical Field
The utility model relates to a road engineering test equipment field especially relates to a road surface crack resistance test device of simulation load and temperature coupling effect.
Background
In a semi-rigid base asphalt pavement structure widely applied in China, reflection cracks are a common disease form, and once the reflection cracks are generated, the appearance and the driving comfort of the pavement are influenced, and more importantly, the service life of the pavement is greatly shortened. Therefore, the prevention and control of the reflection cracks is always a hot spot and a big problem in the engineering industry.
The reflection cracks are mainly caused by vehicle load and temperature change, the two working conditions are usually considered independently in the test research of the effect of preventing the reflection cracks on the geotextile at home and abroad, the common method is to use fixed vertical load or rolling wheels to simulate the vehicle load effect, and simulate the temperature load effect through the horizontal tension effect. Research shows that coupling effect exists in the action of vehicle load and temperature load, the anti-cracking performance of a pavement structure is difficult to reflect really only by applying a single load type, and the evaluation on the effect of preventing and treating reflection cracks of various anti-cracking interlayers is not comprehensive.
In recent years, some scholars perform experimental research on the crack resistance effect of a semi-rigid base asphalt surface layer structure under the condition of simulating load-temperature coupling, can comprehensively simulate the stress condition of an actual road, but mostly need complex test equipment and platforms or need to perform large-scale full-scale tests, and are greatly limited in use and popularization.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome the above problem that prior art exists, provide a road surface anti-crack performance test device of simulation load and temperature coupling effect.
For realizing above-mentioned technical purpose, reach above-mentioned technological effect, the utility model discloses a following technical scheme realizes:
the utility model provides a simulation load and temperature coupling's anti crack performance test device in road surface, includes steel base, rubber slab, test piece, rubber pad and the steel sheet that upwards stacks in proper order from following, the test piece is from upwards including semi-rigid basic unit, geotechnological cloth and pitch surface course in proper order down, geotechnological cloth bonds between semi-rigid basic unit and pitch surface course, be equipped with the prefabricated crack that extends along its minor axis direction in the middle of the bottom of semi-rigid basic unit, the rubber slab has two, and two the rubber slab is about prefabricated crack symmetry, displacement sensor is installed to the side of pitch surface course position in the top of prefabricated crack, and displacement sensor is about prefabricated crack symmetry.
Wherein, steel base, rubber slab, test piece, rubber pad and steel sheet are the cuboid.
The width of the steel base is larger than that of the rubber plate, the width of the test piece, the width of the rubber pad and the width of the steel plate are the same, the length of the rubber plate is smaller than one half of the length of the test piece, the length of the test piece is larger than that of the rubber pad, the length of the rubber pad is larger than the width of a gap of the prefabricated crack, and the length of the steel plate is equal to that of the rubber pad.
Wherein, the thickness of semi-rigid basic unit equals the thickness of pitch surface course, the height of prefabricated crack is four fifths of the thickness of semi-rigid basic unit.
And the height difference between the displacement sensor and the bottom end of the asphalt surface layer is one fifth of the thickness of the asphalt surface layer.
The length of the displacement sensor is larger than the width of a gap of the prefabricated crack, and the measuring range of the displacement sensor is 2 mm.
Wherein the gram weight of the geotextile is 150g/cm 2 The tensile strength is 10.89kN, the elongation at break is 43.23 percent, and the geotextile is a polypropylene non-woven fabric.
Wherein the gap width of the prefabricated crack is 5 mm.
A gap is reserved between the two rubber plates, and the width of the gap is smaller than that of the reserved gap.
Wherein, the bottom end and the top end of the geotextile are respectively coated with a layer with the thickness of 1.2kg/m 2 The emulsified asphalt forms a bond coat.
The utility model has the advantages that: 1. the device is simple in structure, the test piece can be manufactured by a track plate die, and the rubber plate, the rubber pad, the steel plate and the steel base can be directly purchased; 2. only a load is applied along the vertical direction, so that the requirements on the instrument are greatly reduced; 3. a displacement sensor is arranged right above the prefabricated crack, so that the crack expansion condition is visually and accurately recorded; 4. the test piece volume and the loading area are large, the randomness caused by uneven materials and stress concentration in the test process is reduced, and the result reliability is high; compared with the prior art, the utility model, easy operation, the method science, economic nature is strong.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without undue limitation to the invention. In the drawings:
FIG. 1 is a schematic structural diagram of the device for testing the crack resistance of the middle pavement of the utility model;
FIG. 2 is a schematic structural diagram of a test piece in the present invention;
fig. 3 is a load model.
The reference numbers in the figures illustrate: 1-steel base, 2-rubber plate, 3-test piece, 4-rubber pad, 5-steel plate, 6-semi-rigid base layer, 7-geotextile, 8-asphalt surface layer, 9-bonding layer, 10-prefabricated crack and 11-displacement sensor.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
As shown in figures 1 to 2, the road surface crack resistance testing device for simulating load and temperature coupling effect comprises a steel base 1, a rubber plate 2, a test piece 3, a rubber pad 4 and a steel plate 5 which are sequentially stacked from bottom to top, wherein the steel base 1, the rubber plate 2, the test piece 3, the rubber pad 4 and the steel plate 5 are cuboids.
The width of steel base 1 is greater than the width of rubber slab 2, and the width of rubber slab 2, the width of test piece 3, the width of rubber pad 4 and the width of steel sheet 5 are all the same, and the length of rubber slab 2 is less than the half of the length of test piece 3, and the length of test piece 3 is greater than the length of rubber pad 4, and the length of rubber pad 4 is greater than the gap width of prefabricated crack 10, and the length of steel sheet 5 equals the length of rubber pad 4.
The width of the steel plate 5 is the same as the width of the test piece 3, and full width loading is achieved in order to observe the development of cracks from the side. If the loading width is less than the specimen width, stress concentration may be caused not only in the edge region, causing local destruction of the specimen. Moreover, the stress transmitted to the side of the test piece is smaller than that in the interior of the test piece, which may cause the reflection crack to spread in the interior, and the side is not cracked or cracks slowly, which is not beneficial to the observation of the test progress and the data acquisition.
The thickness of the semi-rigid base course 6 is equal to the thickness of the asphalt pavement 8, and the height of the preformed cracks 10 is four-fifths of the thickness of the semi-rigid base course 6.
The height difference between the displacement sensor 11 and the bottom end of the asphalt surface layer 8 is one fifth of the thickness of the asphalt surface layer 8.
The length of the displacement sensor 11 is larger than the gap width of the prefabricated crack 10, and the measuring range of the displacement sensor 11 is 2 mm. The method is used for accurately measuring the crack opening width in the test process.
The gram weight of the geotextile 7 is 150g/cm 2 The tensile strength is 10.89kN, the elongation at break is 43.23 percent, and the geotextile 7 is a polypropylene non-woven fabric.
A gap is reserved between the two rubber plates 2, and the width of the gap is smaller than that of the reserved gap 10.
The bottom end and the top end of the geotextile are respectively coated with a layer with the thickness of 1.2kg/m 2 The emulsified asphalt forms the bond coat 9.
The test process comprises the following steps:
1. manufacturing a test piece:
1.1, manufacturing a semi-rigid base layer with the size of 300mm (length) multiplied by 150mm (width) multiplied by 50mm (height), and curing for 28 days;
1.2, putting the semi-rigid base layer into a mold with the size of 300mm (length) multiplied by 150mm (width) multiplied by 100mm (height), and spreading 1.2kg/m on the top surface of the semi-rigid base layer 2 Emulsified asphalt, namely, a geotextile with the size of 300mm (length) multiplied by 150mm (width) multiplied by 4mm (height) is flatly paved on the upper layer of the emulsified asphalt, and 1.2kg/m2 emulsified asphalt is further scattered on the top of the geotextile;
1.3, preparing aggregates according to the AC25 grading, paving an asphalt surface course with the size of 300mm (length) multiplied by 150mm (width) multiplied by 50mm (height) on the upper part after the geotextile is paved, and demoulding is carried out after cooling for 24 hours at room temperature.
2. Pre-sawing and sewing: and (3) inverting the demoulded test piece, and cutting the seam along the center line of the short axis direction of the test piece by using a cutting machine, wherein the depth of the cut seam is 40mm, namely the distance between the layers is 10 mm.
3. Erecting a test device: connecting and fixing a steel base and the bottom of a universal tester by using a screw, arranging two rubber plates on the steel base, and reserving a gap of about 2mm in the middle; placing the prepared test piece with the prefabricated crack on the rubber plates, wherein the direction of the prefabricated crack is consistent with the direction of the gap between the two rubber plates; placing a rubber pad along the direction of the prefabricated crack on the top of the test piece, and then placing a steel plate for loading on the rubber pad; the indenter of the universal tester (machine) is operated and lowered until the indenter contacts the steel plate.
4. Installing a displacement sensor: the displacement sensor is horizontally arranged at a position 10mm above the surface layer-base layer and right above the prefabricated crack, and the distance between the two anchor points is 60 mm; and marking the mounting position of the anchoring end of the displacement sensor on the side surface of the test piece by using a marking pen, slightly polishing the test piece by using sand paper, and fixing the displacement sensor on the surface of the test piece by using 502 glue.
5. Input load waveform: a load model as shown in FIG. 3 is written and imported into a universal tester loading program, and the load waveform is set to act circularly.
6. Carrying out a fatigue loading test: clicking to start a test, and monitoring vertical stress, strain and reading of a displacement sensor in real time; and observing the crack propagation condition of the asphalt surface layer in the test piece every 10 minutes, and stopping the test when the crack penetrates through the top surface of the surface layer.
The external load adopted by the device simulates the load-temperature coupling effect by using vertical loads with different frequencies and amplitudes according to the characteristic that the vehicle load and the temperature change generate tensile stress on the bottom of the asphalt surface layer. Simulating the load action of a vehicle through a high-frequency low-amplitude vertical sinusoidal load, wherein the frequency is 10 Hz; the effect of temperature load is simulated through the vertical triangular load with low frequency and high amplitude, the frequency is 0.005Hz, and the effect period of temperature difference day and night is equivalent to that when the daily traffic of a lane is 2000. After the two are superposed, a load waveform simulating the load-temperature coupling effect is formed.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention.
Claims (10)
1. The utility model provides a road surface crack resistance test device of simulation load and temperature coupling effect which characterized in that: include from steel base, rubber slab, test piece, rubber pad and the steel sheet that upwards stacks in proper order down, the test piece is from upwards including semi-rigid basic unit, geotechnological cloth and pitch surface course down in proper order, geotechnological cloth bonds between semi-rigid basic unit and pitch surface course, be equipped with the prefabricated crack that extends along its minor axis direction in the middle of the bottom of semi-rigid basic unit, the rubber slab has two, and two the rubber slab is about prefabricated crack symmetry, displacement sensor is installed to the side of pitch surface course is located prefabricated cracked top, and displacement sensor is about prefabricated crack symmetry.
2. The pavement crack resistance test device according to claim 1, characterized in that: the steel base, the rubber plate, the test piece, the rubber pad and the steel plate are all cuboids.
3. The pavement crack resistance test device according to claim 2, characterized in that: the width of the steel base is larger than that of the rubber plate, the width of the test piece, the width of the rubber pad and the width of the steel plate are the same, the length of the rubber plate is smaller than one half of the length of the test piece, the length of the test piece is larger than that of the rubber pad, the length of the rubber pad is larger than the width of a gap of a prefabricated crack, and the length of the steel plate is equal to that of the rubber pad.
4. The pavement crack resistance test device according to claim 1, characterized in that: the thickness of semi-rigid base course equals the thickness of pitch surface course, the height of prefabricated crack is four fifths of the thickness of semi-rigid base course.
5. The pavement crack resistance test device according to claim 1, characterized in that: the height difference between the displacement sensor and the bottom end of the asphalt surface layer is one fifth of the thickness of the asphalt surface layer.
6. The pavement crack resistance test device according to claim 1, characterized in that: the length of the displacement sensor is larger than the width of a gap of the prefabricated crack, and the measuring range of the displacement sensor is 2 mm.
7. The pavement crack resistance test device according to claim 1, characterized in that: the gram weight of the geotextile is 150g/cm 2 The tensile strength is 10.89kN, the elongation at break is 43.23 percent, and the geotextile is a polypropylene non-woven fabric.
8. The pavement crack resistance test device according to claim 1, characterized in that: the width of the gap of the prefabricated crack is 5 mm.
9. The pavement crack resistance test device according to claim 1, characterized in that: a gap is reserved between the two rubber plates, and the gap width of the gap is smaller than that of the reserved gap.
10. The pavement crack resistance test device according to claim 1, characterized in that: the bottom end and the top end of the geotextile are respectively coated with a layer with the thickness of 1.2kg/m 2 The emulsified asphalt forms a bond coat.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220910052.2U CN217332013U (en) | 2022-04-19 | 2022-04-19 | Road surface crack resistance test device for simulating load and temperature coupling effect |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220910052.2U CN217332013U (en) | 2022-04-19 | 2022-04-19 | Road surface crack resistance test device for simulating load and temperature coupling effect |
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| Publication Number | Publication Date |
|---|---|
| CN217332013U true CN217332013U (en) | 2022-08-30 |
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| CN202220910052.2U Expired - Fee Related CN217332013U (en) | 2022-04-19 | 2022-04-19 | Road surface crack resistance test device for simulating load and temperature coupling effect |
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| Country | Link |
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| CN (1) | CN217332013U (en) |
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- 2022-04-19 CN CN202220910052.2U patent/CN217332013U/en not_active Expired - Fee Related
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Granted publication date: 20220830 |