CN107907430B - Test device and test method for testing shearing performance of asphalt mixture - Google Patents
Test device and test method for testing shearing performance of asphalt mixture Download PDFInfo
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- CN107907430B CN107907430B CN201711478138.2A CN201711478138A CN107907430B CN 107907430 B CN107907430 B CN 107907430B CN 201711478138 A CN201711478138 A CN 201711478138A CN 107907430 B CN107907430 B CN 107907430B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/24—Investigating strength properties of solid materials by application of mechanical stress by applying steady shearing forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
- G01N3/04—Chucks
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0025—Shearing
Abstract
The invention discloses a test device for testing the shearing performance of an asphalt mixture, which comprises a first sample fixing clamp and a second sample fixing clamp, wherein the upper part of the first sample fixing clamp is connected with the upper end of the second sample fixing clamp through a first bolt, the lower end of the first sample fixing clamp is connected with the lower part of the second sample fixing clamp through a second bolt, the lengths of the first bolt and the second bolt are equal, the lengths of the first bolt and the second bolt at the outer sides of the first sample fixing clamp and the second sample fixing clamp are equal, a first test machine connecting clamp is fixed at the top of the first sample fixing clamp, and a second test machine connecting clamp is fixed at the bottom of the second sample fixing clamp. The invention also provides a test method for testing the shearing performance of the asphalt mixture by using the device. The invention can make the stress of the sample more uniform, and eliminate the defect that the prior clamp is easy to cause the stress concentration at the edge of the sample; the isovolumetric shear flow deformation in the later stage of actual pavement compaction can be well simulated.
Description
Technical Field
The invention belongs to the technical field of asphalt mixture mechanical property testing, and particularly relates to a testing device and a testing method for testing the shearing property of an asphalt mixture.
Background
With the increase of traffic volume and the increase of axle load, the rutting phenomenon of the asphalt pavement on the expressway is more and more common. Rutting of asphalt pavements is the result of the combined action of compaction by extrusion and shear deformation of the asphalt mixture. For the pavement with insufficient compactness, the initial compaction effect is obvious; for the asphalt pavement with good compaction degree or after a period of open traffic, the asphalt mixture below the ruts generates equal-volume shear flow deformation along with the increase of the axle load times, but the mixture is bulged at the axle load edge due to lateral extrusion to form the ruts.
Therefore, in the design of asphalt pavement and the composition of mixture, the shear strength should be considered, and many road workers at home and abroad are always dedicated to research a simpler method which can directly measure the shear stress and the deformation of the asphalt mixture and is matched with the actual situation on site to the greatest extent. The stress mode of a test piece of the triaxial test can well simulate the stress state of a pavement material under the action of load, but the principle of the triaxial test is derived from soil mechanics, the difference of the test principle, the assumed condition, the material parameters and the like is not completely suitable for asphalt mixture, the test operation is complex, and the application is less; the Superpassive Shear Tester (SST) developed by the US SHRP plan can control a test piece to keep constant height, the test piece is basically in a pure shear state under the condition of unchanged volume, the permanent deformation performance of a mixture can be reflected remarkably, but a simple shear tester is expensive, so that the Superpassive shear tester is rarely applied in China. The university scholars of the same province carry out oblique shear tests on an MTS material testing machine (universal material testing machine) for researching bridge deck pavement and bonding shear strength between a high-grade pavement surface layer and a base layer, the test operation is simple and convenient, but the shortcoming is that the contact part of a test piece and a test mold is easy to generate a stress concentration phenomenon, and the result accuracy is influenced. Sunpik et al propose to simulate the actual stress state using an asphalt mixture penetration shear test, but for large particle size asphalt mixtures, this method is affected by the particle size. In addition, a hollow cylinder shear test, a coaxial shear test and the like are also applied to the evaluation of the shear resistance of the asphalt mixture. The above methods all have respective advantages and disadvantages, and have no unified standard and wide application due to the problems of poor actual simulation degree or high manufacturing cost and the like.
Therefore, designing an effective, fast, economical and practical asphalt mixture shear test device and test method is one of the problems to be solved currently.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a test device for testing the shearing performance of an asphalt mixture, which can enable a sample to be stressed more uniformly and eliminate the defect that the edge of the sample is easy to generate stress concentration by a conventional clamp; compared with a direct shear test and the like, the method is closer to a pure shear state; the isovolumetric shear flow deformation in the later stage of actual pavement compaction can be well simulated.
In order to achieve the purpose, the invention adopts the technical scheme that: the utility model provides a test device of test bituminous mixture shear property which characterized in that: the test sample fixing device comprises a first sample fixing clamp and a second sample fixing clamp which are used for fixing a sample, the first sample fixing clamp and the second sample fixing clamp are identical in structure, the sample is located between the first sample fixing clamp and the second sample fixing clamp, first connecting holes are formed in the upper portion of the first sample fixing clamp and the upper end of the second sample fixing clamp, second connecting holes are formed in the lower end of the first sample fixing clamp and the lower portion of the second sample fixing clamp, the upper portion of the first sample fixing clamp and the upper end of the second sample fixing clamp are connected through a first bolt penetrating through the first connecting holes, a first nut is arranged at the outer end of a screw rod of the first bolt, the lower end of the first sample fixing clamp and the lower portion of the second sample fixing clamp are connected through a second bolt penetrating through the second connecting holes, and a second nut is arranged at the outer end of the screw rod of the second bolt, the structure of first bolt and second bolt is the same and length equals, first bolt and second bolt are equal in the length in first sample mounting fixture, the second sample mounting fixture outside, the top of first sample mounting fixture has first testing machine joint fixture through the third bolt fastening, the bottom of second sample mounting fixture has second testing machine joint fixture through the fourth bolt fastening.
The test device for testing the shearing performance of the asphalt mixture is characterized in that: the longitudinal section shapes of the first sample fixing clamp and the second sample fixing clamp are L-shaped, the first sample fixing clamp and the second sample fixing clamp are arranged oppositely, and a test piece placing cavity is formed between the first sample fixing clamp and the second sample fixing clamp.
The test device for testing the shearing performance of the asphalt mixture is characterized in that: first connecting hole and second connecting hole all are located first sample mounting fixture, second sample mounting fixture's vertical board, on the first sample mounting fixture first connecting hole is located the horizontal plate department that is close to first sample mounting fixture, on the second sample mounting fixture first connecting hole is located the horizontal plate department of keeping away from second sample mounting fixture, on the first sample mounting fixture the second connecting hole is located the horizontal plate department of keeping away from first sample mounting fixture, on the second sample mounting fixture the second connecting hole is located the horizontal plate department of keeping away from second sample mounting fixture.
The test device for testing the shearing performance of the asphalt mixture is characterized in that: the number of the first connecting holes and the number of the second connecting holes on the first sample fixing clamp are two, and the two first connecting holes and the two second connecting holes are symmetrically distributed at four corners of the vertical plate of the first sample fixing clamp; the number of the first connecting holes and the number of the second connecting holes on the second sample fixing clamp are two, and the two first connecting holes and the two second connecting holes are symmetrically distributed at four corners of the vertical plate of the second sample fixing clamp; the first connecting hole and the second connecting hole on the first sample fixing clamp are both unthreaded holes, and the first connecting hole and the second connecting hole on the second sample fixing clamp are both unthreaded holes or both threaded holes.
The test device for testing the shearing performance of the asphalt mixture is characterized in that: and the middle parts of the inner sides of the vertical plates of the first sample fixing clamp and the second sample fixing clamp are respectively provided with a plurality of semi-through grooves.
The test device for testing the shearing performance of the asphalt mixture is characterized in that: the depth of the semi-through groove is 0.5 mm-1.5 mm.
The test device for testing the shearing performance of the asphalt mixture is characterized in that: the plurality of semi-through grooves on the first sample fixing clamp form a first circular semi-through groove structure, and the plurality of semi-through grooves on the second sample fixing clamp form a second circular semi-through groove structure; the diameters of the first circular semi-through groove structure and the second circular semi-through groove structure are both 6 cm-10 cm.
The test device for testing the shearing performance of the asphalt mixture is characterized in that: the first sample fixing clamp and the second sample fixing clamp are both made of steel plates with the thickness of 1.5 cm-3 cm.
In addition, the invention also provides a test method for testing the shearing performance of the asphalt mixture by using the test device, which is characterized by comprising the following steps:
step one, forming a test piece with the diameter of 15cm and the height of 12cm by using a rotary compaction instrument, and then cutting a test piece with the diameter of 10cm and the height of 5cm on the formed test piece;
step two, horizontally placing a second sample fixing clamp, coating epoxy resin adhesives with the mass of 25-40 g on two circular bottom surfaces of the sample, placing the sample coated with the epoxy resin adhesives at a second circular semi-through groove structure of the second sample fixing clamp in the step one, and placing a first sample fixing clamp on the sample, so that the first circular semi-through groove structure of the first sample fixing clamp is opposite to the circular bottom surface of the sample;
thirdly, screwing the first bolt and the second bolt to enable the lengths of the first bolt and the second bolt on the outer sides of the first sample fixing clamp and the second sample fixing clamp to be equal, ensuring that two circular bottom surfaces of the samples are in a parallel state, scraping the extruded redundant epoxy resin adhesive by using a scraper, and curing at normal temperature for at least 12 hours;
placing the sample, the first sample fixing clamp and the second sample fixing clamp in a thermostat and preserving heat for 3-5 hours;
step five, taking down the first bolt and the second bolt, connecting the first sample fixing clamp with the first testing machine connecting clamp through a third bolt, and connecting the second sample fixing clamp with the second testing machine connecting clamp through a fourth bolt;
and step six, respectively connecting the first testing machine connecting clamp and the second testing machine connecting clamp in the step five to two pneumatic clamps of a universal material testing machine, and testing the shearing performance of the asphalt mixture.
The above method is characterized in that: the mass of epoxy resin adhesives coated on the two circular bottom surfaces of the sample in the first step is 30g, the heat preservation time in the fourth step is 4h, and the temperature of the constant temperature box in the fourth step is 20-25 ℃.
Compared with the prior art, the invention has the following advantages:
1. the invention designs the test device for testing the shearing performance of the asphalt mixture on the universal material testing machine, is convenient to operate, can set various loading modes to simulate the stress condition of an actual road surface on site, and can be used for creep test and repeated load test.
2. The testing device designed by the invention controls the contents of the bolt and the epoxy resin adhesive to keep two surfaces of the sample clamp parallel, so that the stress of the sample is more uniform, and the defect that the edge of the test piece is easy to generate stress concentration by the conventional clamp is eliminated; compared with a direct shear test and the like, the method is closer to a pure shear state. The fixture has enough rigidity, so that the thickness of the sample can be basically unchanged, the constant-height shear deformation of the sample is realized, and the isovolumetric shear flow deformation in the later stage of actual pavement compaction is well simulated.
3. According to the invention, the plurality of semi-through grooves are respectively arranged in the middle parts of the inner sides of the vertical plates of the first sample fixing clamp and the second sample fixing clamp, so that the bonding between the sample and the clamps can be enhanced, and the sample is prevented from being broken at the bonding position.
4. The method is suitable for measuring the shearing performance of common asphalt mixtures, modified asphalt mixtures, recycled asphalt mixtures and the like in different loading modes, can evaluate the high-temperature anti-deformation capability of the asphalt mixtures, and is also suitable for testing cut test pieces after core drilling and sampling on site.
5. The invention can obtain the test index with better correlation with the shear resistance of the asphalt mixture, and the test method can better simulate the actual stress state of the asphalt pavement, has high result reliability and has better engineering application prospect.
The invention is described in further detail below with reference to the figures and examples.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a right side view of fig. 1.
Fig. 3 is a schematic structural view of a second sample fixing jig of the present invention.
Fig. 4 is a schematic view showing a positional relationship between the first sample fixing jig, the second sample fixing jig and the sample according to the present invention.
Description of reference numerals:
1-a first sample fixing clamp; 2-1 — third bolt; 2-fourth bolt;
3, connecting a first testing machine with a clamp; 4, connecting a second testing machine with a clamp; 4-1 — a first bolt;
4-2 — second bolt; 5, fixing a clamp for a second sample; 6-sample;
7-1 — a first connection hole; 7-2 — second connection hole; 8, a semi-through groove;
9-a test piece placing cavity; 10-a first nut; 11-second nut.
Detailed Description
The test apparatus for testing the shear properties of an asphalt mixture according to the invention is described in example 1.
Example 1
The test device for testing the shearing performance of the asphalt mixture as shown in fig. 1 and 2 comprises a first sample fixing clamp 1 and a second sample fixing clamp 5 for fixing a sample 6, wherein the first sample fixing clamp 1 and the second sample fixing clamp 5 have the same structure, the sample 6 is positioned between the first sample fixing clamp 1 and the second sample fixing clamp 5, the upper part of the first sample fixing clamp 1 and the upper end of the second sample fixing clamp 5 are both provided with a first connecting hole 7-1, the lower end of the first sample fixing clamp 1 and the lower part of the second sample fixing clamp 5 are both provided with a second connecting hole 7-2, the upper part of the first sample fixing clamp 1 and the upper end of the second sample fixing clamp 5 are connected through a first bolt 4-1 penetrating through the first connecting hole 7-1, a first nut 10 is arranged at the outer end of a screw rod of the first bolt 4-1, the lower end of the first sample fixing clamp 1 and the lower portion of the second sample fixing clamp 5 are connected through a second bolt 4-2 penetrating through a second connecting hole 7-2, a second nut 11 is arranged at the outer end of a screw rod of the second bolt 4-2, the first bolt 4-1 and the second bolt 4-2 are identical in structure and length, the first bolt 4-1 and the second bolt 4-2 are identical in length outside the first sample fixing clamp 1 and the second sample fixing clamp 5, the top of the first sample fixing clamp 1 is fixed with a first testing machine connecting clamp 3 through a third bolt 2-1, and the bottom of the second sample fixing clamp 5 is fixed with a second testing machine connecting clamp 4 through a fourth bolt 2-2.
The first bolt 4-1 and the second bolt 4-2 are identical in structure and length, the first bolt 4-1 and the second bolt 4-2 are identical in length on the outer sides of the first sample fixing clamp 1 and the second sample fixing clamp 5, and errors caused by uneven cutting and the like of the samples are eliminated.
As shown in fig. 1, the first sample fixing jig 1 and the second sample fixing jig 5 are both L-shaped in longitudinal cross-sectional shape, the first sample fixing jig 1 and the second sample fixing jig 5 are arranged oppositely, and a sample placing cavity 9 is formed between the first sample fixing jig 1 and the second sample fixing jig 5.
As shown in fig. 1 and 3, the first connection hole 7-1 and the second connection hole 7-2 are located on a vertical plate of the first sample fixing clamp 1 and the second sample fixing clamp 5, the first connection hole on the first sample fixing clamp 1 is located at a horizontal plate close to the first sample fixing clamp 1, the first connection hole on the second sample fixing clamp 5 is located at a horizontal plate far from the second sample fixing clamp 5, the second connection hole on the first sample fixing clamp 1 is located at a horizontal plate far from the first sample fixing clamp 1, and the second connection hole on the second sample fixing clamp 5 is located at a horizontal plate close to the second sample fixing clamp 5.
In this embodiment, the number of the first connection holes and the number of the second connection holes on the first sample fixing clamp 1 are two, and the two first connection holes and the two second connection holes are symmetrically distributed at four corners of a vertical plate of the first sample fixing clamp 1; the number of the first connecting holes and the number of the second connecting holes on the second sample fixing clamp 5 are two, and the two first connecting holes and the two second connecting holes are symmetrically distributed on four corners of a vertical plate of the second sample fixing clamp 5; the first connecting hole and the second connecting hole on the first sample fixing clamp 1 are both unthreaded holes, and the first connecting hole and the second connecting hole on the second sample fixing clamp 5 are both unthreaded holes or both threaded holes.
As shown in fig. 3, a plurality of semi-through grooves 8 are formed in the middle of the inner sides of the vertical plates of the first sample fixing clamp 1 and the second sample fixing clamp 5.
In the embodiment, the depth of the semi-through groove 8 is 0.5 mm-1.5 mm, so that the bonding between the sample and the clamp is ensured to be dense, and the sample is prevented from being damaged at the bonding position in the test.
In this embodiment, the plurality of half through grooves in the first sample fixing jig 1 form a first circular half through groove structure, and the plurality of half through grooves in the second sample fixing jig 5 form a second circular half through groove structure; the diameters of the first circular semi-through groove structure and the second circular semi-through groove structure are both 6 cm-10 cm.
In this embodiment, the first sample fixing jig 1 and the second sample fixing jig 5 are both made of steel plates having a thickness of 1.5cm to 3 cm.
The test method for testing the shear properties of bituminous mixtures according to the invention is described in examples 2 to 4.
Example 2
The test method for testing the shearing performance of the asphalt mixture by using the test device in the embodiment 1 comprises the following steps:
step one, forming a test piece with the diameter of 15cm and the height of 12cm by using a rotary compaction instrument, and then cutting a test piece 6 with the diameter of 10cm and the height of 5cm on the formed test piece; or drilling a sample with a specified size by on-site core drilling;
step two, horizontally placing a second sample fixing clamp 5, coating epoxy resin adhesive with the mass of 30g on two circular bottom surfaces of the sample 6, then placing the sample 6 coated with the epoxy resin adhesive at a second circular semi-through groove structure of the second sample fixing clamp 5 in the step one, and then placing a first sample fixing clamp 1 on the sample 6, and enabling the first circular semi-through groove structure of the first sample fixing clamp 1 to be opposite to the circular bottom surface of the sample 6, as shown in fig. 4;
thirdly, screwing the first bolt 4-1 and the second bolt 4-2 to enable the lengths of the first bolt 4-1 and the second bolt 4-2 at the outer sides of the first sample fixing clamp 1 and the second sample fixing clamp 5 to be equal, ensuring that two circular bottom surfaces of the sample 6 are in a parallel state, scraping the extruded redundant epoxy resin adhesive by using a scraper, and curing at normal temperature for at least 12 hours;
the first bolt 4-1 and the second bolt 4-2 are screwed, the lengths of the first bolt 4-1 and the second bolt 4-2 outside the first sample fixing clamp 1 and the second sample fixing clamp 5 are ensured to be equal, and meanwhile, enough epoxy resin adhesive is ensured to be arranged on two circular bottom surfaces of the sample 6, so that the two circular bottom surfaces of the sample 6 can be ensured to be in a parallel state (a vernier caliper is used for measuring the distance between the first sample fixing clamp 1 and the second sample fixing clamp 5 in four crossed symmetrical directions, if the height difference between the two sides is larger than 2mm, the bolt and the epoxy resin adhesive are adjusted to meet the requirements, otherwise, the sample is discarded). The temperature at normal temperature is 20-25 ℃;
placing the sample 6, the first sample fixing clamp 1 and the second sample fixing clamp 5 together in a thermostat, and keeping the temperature for 4 hours;
step five, taking down the first bolt 4-1 and the second bolt 4-2, connecting the first sample fixing clamp 1 with the first testing machine connecting clamp 3 through the third bolt 2-1, and connecting the second sample fixing clamp 5 with the second testing machine connecting clamp 4 through the fourth bolt 2-2;
and step six, connecting the first testing machine connecting clamp 3 and the second testing machine connecting clamp 4 in the step five to two pneumatic clamps of a universal material testing machine respectively, and testing the shearing performance of the asphalt mixture.
In this embodiment, the temperature of the oven in step four is 22 ℃.
When the shearing performance of the asphalt mixture is tested, the second sample fixing clamp 5 is fixed, the first sample fixing clamp 1 carries the sample 6 with the loading to generate shearing flow deformation, and the first sample fixing clamp 1 and the second sample fixing clamp 5 have enough rigidity, so that the sample 6 is basically in deformation with the same volume, and the thickness of the sample 6 is basically kept unchanged. Different loading modes are set according to tests, so that the effect of the axle load on the asphalt mixture under different working conditions can be simulated more truly, and the high-temperature deformation resistance of the asphalt mixture can be evaluated objectively.
The universal material testing machine is an existing device and comprises a testing platform, a loading system and a computer control system, wherein the loading system loads asphalt mixture according to a set loading mode, and the computer control system collects data in real time. The test piece is circularly loaded by adopting a strain or stress control mode through the setting of the computer control system, the repeated action of the actual axle load on the asphalt mixture is simulated, and when the test condition is met, the computer control system automatically stores the detection data acquired in the test.
A stress control mode can be adopted, a cyclic 69 +/-5 kPa half-sine wave load is applied to a sample, the loading is carried out for 0.1s in one period, the unloading is carried out for 0.6s, an accumulated strain curve of the asphalt mixture under the action of repeated load is automatically recorded in a test, the action of the actual wheel load on a road surface can be truly simulated, and the shearing resistance of the asphalt mixture in the rutting process can be indirectly reflected through accumulated strain change. In the embodiment, the accumulated strain curve of the test piece generated by the stress control loading mode is regressed to conform to the following formula (1), wherein the shear slope a can represent the high-temperature shear resistance of the asphalt mixture. Therefore, the high-temperature shear resistance of the asphalt mixture can be evaluated by calculating the value a.
(N)＝(1)+a*N (1)
Wherein, (N) is the permanent strain at the Nth loading;
(1) is the permanent set at 1 st loading;
a is the shear slope and N is the number of loads.
Example 3
The test method for testing the shearing performance of the asphalt mixture by using the test device in the embodiment 1 comprises the following steps:
step one, forming a test piece with the diameter of 15cm and the height of 12cm by using a rotary compaction instrument, and then cutting a test piece 6 with the diameter of 10cm and the height of 5cm on the formed test piece;
step two, horizontally placing a second sample fixing clamp 5, coating epoxy resin adhesives with the mass of 25g on two circular bottom surfaces of a sample 6, then placing the sample 6 coated with the epoxy resin adhesives at a second circular semi-through groove structure of the second sample fixing clamp 5 in the step one, and then placing a first sample fixing clamp 1 on the sample 6, so that the first circular semi-through groove structure of the first sample fixing clamp 1 is opposite to the circular bottom surface of the sample 6;
thirdly, screwing the first bolt 4-1 and the second bolt 4-2 to enable the lengths of the first bolt 4-1 and the second bolt 4-2 at the outer sides of the first sample fixing clamp 1 and the second sample fixing clamp 5 to be equal, ensuring that two circular bottom surfaces of the sample 6 are in a parallel state, scraping the extruded redundant epoxy resin adhesive by using a scraper, and curing at normal temperature for at least 12 hours;
placing the sample 6, the first sample fixing clamp 1 and the second sample fixing clamp 5 together in a thermostat and preserving heat for 3 hours;
step five, taking down the first bolt 4-1 and the second bolt 4-2, connecting the first sample fixing clamp 1 with the first testing machine connecting clamp 3 through the third bolt 2-1, and connecting the second sample fixing clamp 5 with the second testing machine connecting clamp 4 through the fourth bolt 2-2;
and step six, connecting the first testing machine connecting clamp 3 and the second testing machine connecting clamp 4 in the step five to two pneumatic clamps of a universal material testing machine respectively, and testing the shearing performance of the asphalt mixture.
In this embodiment, the temperature of the oven in step four is 25 ℃.
In this example, the rest of the test methods were the same as in example 2.
Example 4
The test method for testing the shearing performance of the asphalt mixture by using the test device in the embodiment 1 comprises the following steps:
step one, forming a test piece with the diameter of 15cm and the height of 12cm by using a rotary compaction instrument, and then cutting a test piece 6 with the diameter of 10cm and the height of 5cm on the formed test piece;
step two, horizontally placing a second sample fixing clamp 5, coating epoxy resin adhesive with the mass of 40g on two circular bottom surfaces of a sample 6, then placing the sample 6 coated with the epoxy resin adhesive at a second circular semi-through groove structure of the second sample fixing clamp 5 in the step one, then placing a first sample fixing clamp 1 on the sample 6, and enabling the first circular semi-through groove structure of the first sample fixing clamp 1 to be opposite to the circular bottom surface of the sample 6;
thirdly, screwing the first bolt 4-1 and the second bolt 4-2 to enable the lengths of the first bolt 4-1 and the second bolt 4-2 at the outer sides of the first sample fixing clamp 1 and the second sample fixing clamp 5 to be equal, ensuring that two circular bottom surfaces of the sample 6 are in a parallel state, scraping the extruded redundant epoxy resin adhesive by using a scraper, and curing at normal temperature for at least 12 hours;
placing the sample 6, the first sample fixing clamp 1 and the second sample fixing clamp 5 together in a thermostat, and keeping the temperature for 5 hours;
step five, taking down the first bolt 4-1 and the second bolt 4-2, connecting the first sample fixing clamp 1 with the first testing machine connecting clamp 3 through the third bolt 2-1, and connecting the second sample fixing clamp 5 with the second testing machine connecting clamp 4 through the fourth bolt 2-2;
and step six, connecting the first testing machine connecting clamp 3 and the second testing machine connecting clamp 4 in the step five to two pneumatic clamps of a universal material testing machine respectively, and testing the shearing performance of the asphalt mixture.
In this embodiment, the temperature of the oven in step four is 20 ℃.
In this example, the rest of the test methods were the same as in example 2.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and all simple modifications, changes and equivalent structural changes made to the above embodiment according to the technical spirit of the present invention still fall within the protection scope of the technical solution of the present invention.
Claims (7)
1. The utility model provides a test device of test bituminous mixture shear property which characterized in that: the device comprises a first sample fixing clamp (1) and a second sample fixing clamp (5) which are used for fixing a sample (6), wherein the first sample fixing clamp (1) and the second sample fixing clamp (5) are identical in structure, the sample (6) is positioned between the first sample fixing clamp (1) and the second sample fixing clamp (5), the upper part of the first sample fixing clamp (1) and the upper end of the second sample fixing clamp (5) are respectively provided with a first connecting hole (7-1), the lower end of the first sample fixing clamp (1) and the lower part of the second sample fixing clamp (5) are respectively provided with a second connecting hole (7-2), the upper part of the first sample fixing clamp (1) and the upper end of the second sample fixing clamp (5) are connected through a first bolt (4-1) of the first connecting hole (7-1), a first nut (10) is arranged at the outer end of a screw rod of the first bolt (4-1), the lower end of the first sample fixing clamp (1) is connected with the lower part of the second sample fixing clamp (5) through a second bolt (4-2) penetrating through a second connecting hole (7-2), a second nut (11) is arranged at the outer end of the screw rod of the second bolt (4-2), the first bolt (4-1) and the second bolt (4-2) are identical in structure and length, the first bolt (4-1) and the second bolt (4-2) are identical in length at the outer sides of the first sample fixing clamp (1) and the second sample fixing clamp (5), a first testing machine connecting clamp (3) is fixed at the top of the first sample fixing clamp (1) through a third bolt (2-1), a second test machine connecting clamp (4) is fixed at the bottom of the second test sample fixing clamp (5) through a fourth bolt (2-2);
the longitudinal section shapes of the first sample fixing clamp (1) and the second sample fixing clamp (5) are both L-shaped, the first sample fixing clamp (1) and the second sample fixing clamp (5) are oppositely arranged, and a test piece placing cavity (9) is formed between the first sample fixing clamp (1) and the second sample fixing clamp (5);
first connecting hole (7-1) and second connecting hole (7-2) all are located the vertical board of first sample mounting fixture (1), second sample mounting fixture (5), the vertical inboard middle part of first sample mounting fixture (1) and second sample mounting fixture (5) all is provided with a plurality of half logical recess (8), the degree of depth of half logical recess (8) is 0.5mm ~ 1.5 mm.
2. The test device for testing the shearing performance of the asphalt mixture according to claim 1, which is characterized in that: first connecting hole on first sample mounting fixture (1) is located the horizontal plate department that is close to first sample mounting fixture (1), on second sample mounting fixture (5) first connecting hole is located the horizontal plate department of keeping away from second sample mounting fixture (5), on first sample mounting fixture (1) the second connecting hole is located the horizontal plate department of keeping away from first sample mounting fixture (1), on second sample mounting fixture (5) the horizontal plate department of being close to second sample mounting fixture (5) is located to the second connecting hole.
3. The test device for testing the shearing performance of the asphalt mixture according to claim 1, which is characterized in that: the number of the first connecting holes and the number of the second connecting holes on the first sample fixing clamp (1) are two, and the two first connecting holes and the two second connecting holes are symmetrically distributed at four corners of a vertical plate of the first sample fixing clamp (1); the number of the first connecting holes and the number of the second connecting holes on the second sample fixing clamp (5) are two, and the two first connecting holes and the two second connecting holes are symmetrically distributed at four corners of a vertical plate of the second sample fixing clamp (5); first connecting hole and second connecting hole on first sample mounting fixture (1) are the unthreaded hole, first connecting hole and second connecting hole on second sample mounting fixture (5) are the unthreaded hole or are the screw.
4. The test device for testing the shearing performance of the asphalt mixture according to claim 1, which is characterized in that: the plurality of semi-through grooves on the first sample fixing clamp (1) form a first circular semi-through groove structure, and the plurality of semi-through grooves on the second sample fixing clamp (5) form a second circular semi-through groove structure; the diameters of the first circular semi-through groove structure and the second circular semi-through groove structure are both 6 cm-10 cm.
5. The test device for testing the shearing performance of the asphalt mixture according to claim 4, which is characterized in that: the first sample fixing clamp (1) and the second sample fixing clamp (5) are both made of steel plates with the thickness of 1.5 cm-3 cm.
6. A test method for testing the shear properties of asphalt mixtures by using the test device of claim 5, characterized in that the method comprises the following steps:
step one, forming a test piece with the diameter of 15cm and the height of 12cm by using a rotary compaction instrument, and then cutting a test piece (6) with the diameter of 10cm and the height of 5cm on the formed test piece;
step two, horizontally placing a second sample fixing clamp (5), coating epoxy resin adhesives with the mass of 25-40 g on two circular bottom surfaces of a sample (6), placing the sample (6) coated with the epoxy resin adhesives at a second circular semi-through groove structure of the second sample fixing clamp (5) in the step one, placing a first sample fixing clamp (1) on the sample (6), and enabling the first circular semi-through groove structure of the first sample fixing clamp (1) to be opposite to the circular bottom surface of the sample (6);
thirdly, screwing the first bolt (4-1) and the second bolt (4-2) to enable the lengths of the first bolt (4-1) and the second bolt (4-2) on the outer sides of the first sample fixing clamp (1) and the second sample fixing clamp (5) to be equal, ensuring that two circular bottom surfaces of the sample (6) are in a parallel state, scraping the extruded redundant epoxy resin adhesive by using a scraper, and curing at normal temperature for at least 12 hours;
placing the sample (6), the first sample fixing clamp (1) and the second sample fixing clamp (5) in a thermostat for heat preservation for 3-5 h;
fifthly, taking down the first bolt (4-1) and the second bolt (4-2), connecting the first sample fixing clamp (1) with the first testing machine connecting clamp (3) through the third bolt (2-1), and connecting the second sample fixing clamp (5) with the second testing machine connecting clamp (4) through the fourth bolt (2-2);
and step six, connecting the first testing machine connecting clamp (3) and the second testing machine connecting clamp (4) in the step five to two pneumatic clamps of a universal material testing machine respectively, and testing the shearing performance of the asphalt mixture.
7. The method of claim 6, wherein: the mass of epoxy resin adhesives coated on the two circular bottom surfaces of the sample (6) in the first step is 30g, the heat preservation time in the fourth step is 4h, and the temperature of the constant temperature box in the fourth step is 20-25 ℃.
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| CN109632531B (en) * | 2019-01-15 | 2020-08-25 | 北京航空航天大学 | High-strength cyclic shear test fixture |
| CN110686972B (en) * | 2019-10-16 | 2020-11-03 | 南京航空航天大学 | Sample for measuring shear modulus of flexible skin of morphing aircraft and experimental method |
| CN111175111B (en) * | 2020-03-02 | 2022-02-01 | 湘潭大学 | Clamp for shear test of asphalt concrete contact test piece and test method thereof |
| CN112113858B (en) * | 2020-09-08 | 2022-06-03 | 中南大学 | Shear test device and method for high-strength metal plate |
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| CN203275158U (en) * | 2013-05-16 | 2013-11-06 | 东南大学 | Test device for compound cracking of asphalt mixture |
| CN204679322U (en) * | 2015-06-05 | 2015-09-30 | 北京市道路工程质量监督站 | A kind of die trial testing actual pavement track |
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| TW549441U (en) * | 2002-10-29 | 2003-08-21 | De-Shian Shen | Testing apparatus of direct shear force |
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| CN102095680A (en) * | 2010-12-30 | 2011-06-15 | 中交第一公路勘察设计研究院有限公司 | Clamp and method for testing pavement interlayer shear fatigue test piece |
| CN202372415U (en) * | 2011-12-21 | 2012-08-08 | 朱谭谭 | Portable strength tester |
| CN102901676B (en) * | 2012-10-31 | 2015-07-29 | 河海大学 | A kind of vertical direct shear test device |
| CN203011784U (en) * | 2013-01-04 | 2013-06-19 | 南京工业大学 | Detection apparatus for inter-layer shearing strength of asphalt concrete layer |
| CN205138908U (en) * | 2015-11-13 | 2016-04-06 | 河南城建学院 | Novel asphaltic sands shearing test device |
| CN205333429U (en) * | 2015-11-30 | 2016-06-22 | 哈尔滨飞机工业集团有限责任公司 | Combined material draws and cuts experimental frock |
| CN106370529A (en) * | 2016-08-30 | 2017-02-01 | 江苏中路工程技术研究院有限公司 | Annular direct shear test device and testing method of asphalt mixture |
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| CN203275158U (en) * | 2013-05-16 | 2013-11-06 | 东南大学 | Test device for compound cracking of asphalt mixture |
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