CN212340884U - Asphalt pavement reflection crack propagation simulation test device with middle layer - Google Patents
Asphalt pavement reflection crack propagation simulation test device with middle layer Download PDFInfo
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- CN212340884U CN212340884U CN202021147336.8U CN202021147336U CN212340884U CN 212340884 U CN212340884 U CN 212340884U CN 202021147336 U CN202021147336 U CN 202021147336U CN 212340884 U CN212340884 U CN 212340884U
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Abstract
The utility model discloses a set up bituminous paving reflection crack extension analogue test device in intermediate level, including quick-witted case, bituminous paving simulation platform, wheel load device and temperature regulation apparatus. The asphalt pavement simulation platform comprises a base, wherein a movable plate and a settlement plate are arranged on the base, and a horizontal power device is arranged on the movable plate. The wheel-mounted device comprises a test wheel, a sliding device, a sliding rod, a connecting platform, a test wheel telescopic device, a loading test block and the like, and is connected with a wheel-mounted power device. The utility model discloses not only follow horizontal direction simulation temperature type (open type) reflection crack, still follow vertical direction simulation load type (shearing type) reflection crack, the simulation of truly pressing close to is carried out with the extension to the emergence of semi-rigid basic unit bituminous paving actual reflection crack, and the anti effect of splitting of different bituminous paving intermediate layer materials is compared in the analysis, and the kind of rational selection intermediate layer material has the significance to delaying bituminous paving reflection crack and extension road surface life.
Description
Technical Field
The utility model relates to a road engineering semi-rigid basic unit bituminous paving reflection crack research field, concretely relates to bituminous paving reflection crack extension analogue test device who sets up the intermediate level.
Background
The development and construction of road traffic infrastructure is an important foundation for the development of national economy and society, and in recent years, the road traffic industry of China is rapidly developed. Statistically, more than 90% of the already-built highways use asphalt pavement, and among these asphalt pavements, the semi-rigid base course is the main structural form. However, since the semi-rigid material has the characteristics of dry shrinkage and temperature shrinkage, shrinkage cracking is easily caused under the action of ambient temperature and humidity, and meanwhile, under repeated rolling of vehicle load, stress at the top end of the crack is concentrated, the crack of the semi-rigid base layer gradually expands from bottom to top, so that the bottom of the asphalt surface layer cracks, and the crack further expands upwards until the crack of the asphalt surface layer is communicated, so that a reflection crack is formed. Reflective cracks have been investigated as a major defect of this structure.
For reflection cracking, it is now generally recognized by the road academy that under reciprocating vehicle loads and temperature stresses, or both, it is believed that the cracks or joints tend to develop shear or tensile stress concentrations at the asphalt layer base that, when these shear or tensile stresses exceed the asphalt layer shear or tensile strength, cause the asphalt layer base to crack and gradually extend throughout the asphalt pavement.
Road scholars and scientific research institutions at home and abroad also develop a plurality of semi-rigid base asphalt pavement reflection crack test devices and methods. The method mainly comprises the steps of simulating tensile, bending and shearing fatigue cracking of a structural layer, analyzing the fatigue cracking process of the structural layer, researching the fracture characteristic of the structural layer and evaluating the anti-cracking effect of the structural layer, but at present, no unified fatigue simulation test method exists, test methods adopted by various countries are different, and corresponding simulation test methods adopted by different structural types are different. Some domestic scholars or scientific research institutions adopt large-scale full-scale fatigue tests to simulate the crack generation process, but the test consumes more materials, has long test period and unstable test data. Therefore, in order to deeply research the performance of the asphalt mixture for inhibiting the reflection cracks, the development of the indoor simulation test device for the reflection cracks of the asphalt pavement, which can truly reflect the formation and the expansion processes of the reflection cracks of the structural layer material and is simple, feasible and convenient to operate, has very important significance.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that semi-rigid basic unit bituminous paving reflection crack is experimental among the prior art's experimental consumptive material is many, experimental cycle is long, experimental data is unstable, and aim at provides a bituminous paving reflection crack extension analogue test device who sets up the intermediate level, has solved semi-rigid basic unit bituminous paving reflection crack test easy and simple to handle and the reliable problem of data.
The utility model discloses a following technical scheme realizes:
a bituminous pavement reflection crack propagation simulation test device with an intermediate layer comprises a case, a bituminous pavement simulation platform, a wheel load device and a temperature regulating device, wherein the bituminous pavement simulation platform, the wheel load device and the temperature regulating device are sequentially arranged in the case from bottom to top; the wheel-load device comprises a loading test block, a test wheel expansion device, a connecting platform, a sliding device and a test wheel which are sequentially connected from top to bottom, wherein a sliding rod is arranged on the sliding device, the connecting platform is connected with a wheel-load power device, the wheel-load power device is used for controlling the wheel-load device to move left and right, adjusting the moving rate of the wheel-load device and recording the wheel-load rolling times, the test wheel telescopic device is driven to enable the test wheel to be in contact with or far away from the first test piece, and the temperature adjusting device comprises a heating device and a temperature sensor.
The utility model discloses a test device not only can follow horizontal direction analog temperature type (open type) reflection crack, can also follow vertical direction analog load type (shear type) reflection crack. Firstly, an intermediate layer test specimen (a first specimen) and a fine grain type asphalt concrete specimen (a second specimen) which are stacked together are adopted, the specimens are fixed on a movable plate and a settlement plate through specimen clamps, a reserved seam is reserved between the movable plate and the settlement plate, a loading test block is arranged, a test wheel expansion device is adjusted, a test wheel is in contact with the test specimen, the moving speed of a wheel-loaded power device and a horizontal power device is set, the wheel-loaded power device and the movable plate power device are started, and a test is started. The fine-grain asphalt concrete test piece (the second test piece) is used for simulating an asphalt concrete pavement surface layer, and the middle layer test piece (the first test piece) is used for simulating a middle layer arranged between the asphalt concrete pavement surface layer and a base layer (a movable plate and a settlement plate). The method is characterized in that the frequency of wheel load and the action of the movable plate when the middle layer test specimen cracks and cracks penetrate for the first time is recorded, the number and the extension direction of the cracks are observed, the method is used for evaluating the anti-reflection crack performance of the middle layer test specimen, analyzing and comparing the anti-cracking effects of different asphalt pavement middle layer materials, reasonably selecting the type of the middle layer material, and has important significance for delaying the asphalt pavement reflection cracks and prolonging the service life of the pavement.
The sliding device is connected and arranged on the sliding rod, and when the wheel-mounted power device is started, the whole vertical wheel-mounted device moves left and right on the sliding rod, so that the rolling effect of wheels on the road surface is simulated.
The test wheel telescopic device is used for controlling the test wheel to stretch up and down, when a test is started, the test wheel telescopic device is contracted downwards, the test wheel is contacted with a test piece, the test is started, when the test is finished, the test wheel telescopic device is extended upwards, and the test wheel is lifted from the surface of the test piece.
The reserved seam is arranged between the moving plate and the settling plate and is used for simulating a seam generated by the semi-rigid base layer; the sliding wheels arranged at the lower part of the moving plate can slide left and right on the base platform relative to the settling plate and are used for simulating the stretching effect of the temperature change on the cracked semi-rigid base layer; and the spring is arranged at the lower part of the settlement plate and is used for simulating the uneven settlement of the roadbed.
The heating device is used for heating the case to meet the requirements of different environmental temperatures, and the temperature sensor is used for sensing the temperature in the case.
Furthermore, the contact surfaces among the middle layer test specimen, the fine particle type asphalt concrete specimen, the moving plate and the settling plate are coated with adhesives.
Furthermore, an isolation net is arranged between the temperature adjusting device and the wheel-mounted device. The isolation net is used for isolating the heating device to prevent the tester from touching the heating device and being scalded.
Furthermore, the reserved seam is 5-10 mm.
Further, the test wheel is a rubber test wheel. For simulating a rolled tire.
Further, the horizontal power device is used for controlling the moving plate to move left and right, adjusting the moving speed and recording the moving times; the wheel-load power device is used for controlling the left and right movement of the wheel-load device, adjusting the movement rate and recording the wheel-load rolling times.
Furthermore, the bottom of the case is provided with universal wheels. The movement of the whole testing device is convenient.
Furthermore, the case is made of aluminum alloy materials.
Furthermore, the base, the moving plate and the settling plate are all made of stainless steel materials. The stainless steel base provides a stable test platform for simulation test. Stainless steel moving and settling plates were used to simulate the semi-rigid base course of asphalt pavement.
Further, the loading test blocks are composed of test blocks with different weights. The loading test block can be added with test blocks with different weights according to the needs so as to meet the needs of different load sizes.
Further, the first test piece and the second test piece are both made of an asphalt mixture wheel mill.
Compared with the prior art, the utility model, following advantage and beneficial effect have:
the utility model discloses a test device not only can follow horizontal direction simulation temperature type (open type) reflection crack, can also follow vertical direction simulation load type (shearing type) reflection crack, can carry out the simulation of truly pressing close to the emergence and the extension of semi-rigid basic unit bituminous paving actual reflection crack, the anti effect of splitting of different bituminous paving intermediate layer materials is compared in the analysis, the kind of rational selection intermediate layer material has the significance to delaying bituminous paving reflection crack and extension road surface life.
The utility model discloses it is easy and simple to handle, can simulate real bituminous paving reflection crack propagation condition, experimental data is true reliable.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments 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 principles of the invention. In the drawings:
fig. 1 is a schematic plan view of the present invention;
FIG. 2 is a schematic view of a wheel-mounted structure;
fig. 3 is a side view of the wheel-mounted structure.
Reference numbers and corresponding part names in the drawings:
the test bed comprises a machine box 1, a base 2, a settling plate 3, a test piece card 4, a first test piece 5, a second test piece 6, a reserved seam 7, a binder 8, a movable plate 9, a horizontal power device 10, a wheel-mounted power device 11, a loading test block 12, a test wheel expansion device 13, a connecting platform 14, a sliding rod 15, a sliding device 16, a test wheel 17, a temperature sensor 18, an isolation net 19, a heating device 20 and a universal wheel 21.
Detailed Description
To make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the following examples and drawings, and the exemplary embodiments and descriptions thereof of the present invention are only used for explaining the present invention, and are not intended as limitations of the present invention.
Example 1
The present embodiment 1 is an intermediate-layer-provided bituminous pavement reflection crack propagation simulation test apparatus, as shown in fig. 1, fig. 2, and fig. 3, and specifically includes an external chassis 1, a bituminous pavement simulation platform, a wheel load device, and a temperature adjustment device. The asphalt pavement simulation platform comprises a base 2 connected with the bottom of a case, a movable plate 9 and a settlement plate 3 are mounted on the base, and a horizontal power device 10 is mounted on the movable plate. The wheel-mounted device comprises a rubber test wheel 17, a sliding device 16, a sliding rod 15, a connecting platform 14, a test wheel telescopic device 13, a loading test block 12 and the like, and a wheel-mounted power device 11 is connected to the wheel-mounted device. The device can simulate temperature type open type reflection cracks in the horizontal direction and load type shear type reflection cracks in the vertical direction, and can simulate real approaching to actual reflection cracks of semi-rigid base asphalt pavement.
The case 1 is made of aluminum alloy materials, and universal wheels 21 are arranged at the bottom of the case, so that the whole device can move conveniently.
The base 2 is made of stainless steel materials, and a stable test platform is provided for a simulation test.
The moving plate 9 and the settling plate 3 are used for simulating a semi-rigid base layer of the asphalt pavement and are made of stainless steel materials. A reserved seam 7 with the thickness of 5-10 mm is arranged between the moving plate 9 and the settling plate 3 and is used for simulating a seam generated by a semi-rigid base layer; the lower part of the moving plate 9 is provided with a sliding wheel which can slide left and right on the platform of the base 2 relative to the sedimentation plate 3 and is used for simulating the stretching effect of the temperature change on the cracked semi-rigid base layer; the lower part of the settlement plate 3 is provided with a spring which is used for simulating the uneven settlement of the roadbed.
The moving plate power device 10 is used for controlling the left and right movement of the moving plate 9, and can adjust the size of the moving speed and record the moving times.
The middle layer test specimen (the first specimen 5) and the fine particle type asphalt concrete specimen (the second specimen 6) are both made of an asphalt mixture wheel mill, and the middle layer specimen, the two steel plate moving plates and the settling plate, and the middle layer specimen and the fine particle type asphalt concrete specimen are bonded by a bonding agent 8.
The test piece card 4 is used for fixing a test piece.
The sliding device 16 is connected to the sliding rod 15, and when the wheel-mounted power device is started, the whole vertical wheel-mounted device moves left and right on the sliding rod, so that the rolling effect of wheels on the road surface is simulated.
The test wheel telescoping device 13 is used for controlling the up-and-down telescoping of the test wheel 17, when the test is started, the test wheel telescoping device 13 extends downwards, the test wheel 17 is in contact with the test piece 5, the test is started, when the test is finished, the test wheel telescoping device 13 is retracted upwards, and the test wheel 17 is lifted from the surface of the test piece 5.
The loading test block 12 can be added with test blocks with different weights as required to meet the requirements of different load sizes.
The wheel-load power device 11 is used for controlling the left and right movement of the whole wheel-load device, and can adjust the movement rate and record the wheel-load rolling times according to the requirements.
The heating device 20 is used to heat the cabinet to meet the requirements of different ambient temperatures.
The temperature sensor 18 is used for sensing the temperature in the cabinet.
The isolation net 19 is used for isolating the heating device 20 to prevent the tester from touching the heating device and being scalded.
The specific use method of the embodiment is as follows: firstly, adopt bituminous mixture wheel mill appearance shaping intermediate level test specimen (first specimen 5) and particulate formula asphalt concrete specimen (second specimen 6), bond two specimens together with binder 8, then bond two good specimens on movable plate 9 and settlement plate 3, leave 5 ~ 10 mm's reservation seam 7 between movable plate 9 and the settlement plate 3, it is fixed with whole specimen with test specimen card 4, set up the size of loading test block 12, adjust test wheel telescoping device 13, let test wheel 17 and test specimen 5 contact, set up the removal rate that wheel carried power device and movable plate power device, start wheel carried power device and portable version power device, begin the experiment. Recording the frequency of wheel load and action of the movable plate when the middle layer test specimen (the first specimen 5) is cracked for the first time and the crack penetrates, observing the number and the extension direction of the cracks, evaluating the anti-reflection crack performance of the middle layer test specimen, analyzing and comparing the anti-cracking effect of the middle layer materials of different asphalt pavements, and reasonably selecting the types of the middle layer materials.
The above-mentioned embodiments, further detailed description of the objects, technical solutions and advantages of the present invention, it should be understood that the above description is only the embodiments of the present invention, and is not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. The asphalt pavement reflection crack propagation simulation test device provided with the middle layer is characterized by comprising a case (1), an asphalt pavement simulation platform, a wheel load device and a temperature regulating device, wherein the asphalt pavement simulation platform, the wheel load device and the temperature regulating device are sequentially arranged in the case (1) from bottom to top;
the bituminous pavement simulation platform comprises a base (2), a movable plate (9), a settlement plate (3), a horizontal power device (10) connected with the movable plate (9) and a test piece card (4) used for fixing a test piece, wherein the movable plate (9) and the settlement plate (3) are positioned on the same plane and are both arranged on the top surface of the base (2), a sliding wheel is arranged between the movable plate (9) and the base (2), and the horizontal power device (10) is used for controlling the movable plate (9) to move left and right, adjusting the moving rate of the movable plate (9) and recording the moving times of the movable plate (9);
a spring is arranged between the sedimentation plate (3) and the base (2), a reserved seam (7) is arranged between the movable plate (9) and the sedimentation plate (3), one part of the test piece card (4) is arranged at the top of the movable plate (9), the other part of the test piece card (4) is arranged at the top of the sedimentation plate (3), a test piece fixed in the middle of the test piece card (4) comprises a first test piece (5) and a second test piece (6) which are sequentially arranged from bottom to top, the first test piece is a middle layer test piece, and the second test piece is a fine grain type asphalt concrete test piece;
the wheel-mounted device comprises a loading test block (12), a test wheel telescopic device (13), a connecting platform (14), a sliding device (16) and a test wheel (17) which are sequentially connected from top to bottom, wherein a sliding rod (15) is arranged on the sliding device (16), the connecting platform (14) is connected with a wheel-mounted power device (11), the test wheel telescopic device (13) is used for controlling the test wheel (17) to contact with or be far away from the first test piece (5), and the wheel-mounted power device (11) is used for controlling the wheel-mounted device to move left and right, adjusting the moving rate of the wheel-mounted device and recording the wheel-mounted rolling times;
the temperature regulating device comprises a heating device (20) and a temperature sensor (18).
2. The asphalt pavement reflection crack propagation simulation test device provided with the middle layer as claimed in claim 1, wherein the contact surfaces between the middle layer test specimen (5), the fine grain asphalt concrete specimen (6), the moving plate (9) and the settlement plate (3) are coated with an adhesive (8).
3. The asphalt pavement reflection crack propagation simulation test device provided with the intermediate layer as claimed in claim 1, wherein an isolation net (19) is arranged between the temperature regulation device and the wheel-mounted device.
4. The asphalt pavement reflection crack propagation simulation test device provided with the middle layer as claimed in claim 1, wherein the reserved crack (7) is 5-10 mm.
5. The asphalt pavement reflection crack propagation simulation test device provided with the intermediate layer as claimed in claim 1, wherein the test wheel (17) is a rubber test wheel.
6. The asphalt pavement reflection crack propagation simulation test device provided with the middle layer as claimed in claim 1, wherein the bottom of the case (1) is provided with universal wheels (21).
7. The asphalt pavement reflection crack propagation simulation test device provided with the middle layer as claimed in claim 1, wherein the case (1) is made of an aluminum alloy material.
8. The asphalt pavement reflection crack propagation simulation test device provided with the middle layer as claimed in claim 1, wherein the base (2), the moving plate (9) and the settlement plate (3) are made of stainless steel.
9. The asphalt pavement reflection crack propagation simulation test device provided with the intermediate layer as claimed in claim 1, wherein the loading test block (12) is composed of test blocks of different weights.
10. The bituminous pavement reflection crack propagation simulation test device provided with the intermediate layer according to claim 1, wherein the first test piece (5) and the second test piece (6) are both made of an asphalt mixture wheel mill.
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| CN202021147336.8U CN212340884U (en) | 2020-06-19 | 2020-06-19 | Asphalt pavement reflection crack propagation simulation test device with middle layer |
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| CN202021147336.8U CN212340884U (en) | 2020-06-19 | 2020-06-19 | Asphalt pavement reflection crack propagation simulation test device with middle layer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115406784A (en) * | 2022-10-31 | 2022-11-29 | 山东高速明董公路有限公司 | Cement stabilized macadam pavement fracturing fatigue test platform |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115406784A (en) * | 2022-10-31 | 2022-11-29 | 山东高速明董公路有限公司 | Cement stabilized macadam pavement fracturing fatigue test platform |
| CN115406784B (en) * | 2022-10-31 | 2023-01-10 | 山东高速明董公路有限公司 | Cement stabilized macadam pavement fracturing fatigue test platform |
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