CN208579997U - The test device of paving mix and its structure Interlaminar shear strengths - Google Patents
The test device of paving mix and its structure Interlaminar shear strengths Download PDFInfo
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- CN208579997U CN208579997U CN201821307574.3U CN201821307574U CN208579997U CN 208579997 U CN208579997 U CN 208579997U CN 201821307574 U CN201821307574 U CN 201821307574U CN 208579997 U CN208579997 U CN 208579997U
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Abstract
The paving mix of the utility model and its test device of structure Interlaminar shear strengths, including pedestal, shear loads fixture, positive pressure charging assembly and test specimen loading fixture, pedestal is mounted on MTS etc and is recycled on the loading bench of loading equipemtn, test specimen loading fixture is mounted on the base, test specimen is installed in test specimen loading fixture, and the shear surface of test specimen is close to the test specimen loading fixture lateral edge of corresponding side, shearing loads fixture is installed on test specimen, and the shear surface of test specimen is located between shearing loads fixture lateral edge and the test specimen loading fixture lateral edge of corresponding side, loads fixture is sheared between loading bench and load bar, and load space is formed between shearing loads fixture and pedestal, positive pressure charging assembly is installed in the both ends of the surface of test specimen, and positive pressure charging assembly force direction is perpendicular to the shear surface of test specimen.The test device has the advantages that the shearing strength and shear fatigue performance reflected with capable of simulating traffic loading, complete and accurate under varying environment temperature, normal pressure and shearing.
Description
Technical field
The utility model relates generally to the field of test technology more particularly to a kind of paving mix and its structure interlayer shear
The test device of performance.
Background technique
" bituminous pavement design for highway specification " spreads the pitch of cement concrete or Steel Bridge Deck, Cement Concrete Pavement Slab etc.
Dress layer is formed by composite pavement structure and proposes design requirement and method, but in recent years with the volume of traffic especially heavy vehicle
Increase, generally there is deformation, passage, check crack, pit slot, peeling, transverse crack in the asphalt mixture surfacing of these composite pavements
Etc. diseases.One of major reason is asphalt mixture paving course and cement concrete pavement or cement concrete bridge deck, steel
Anti-shearing damage capability between bridge floor is insufficient, cannot bear the effect of traffic loading, shows as shear at high temperature passage and room temperature
Two class of shear fatigue is destroyed.For this purpose, people have carried out a series of research works to bituminous pavement composite structure Interlaminar shear strengths
Make.The study found that its Interlaminar shear strengths and traffic loading, environmental factor (temperature, water), pavement material, Boundary condition etc. because
It is known as pass.But these research work are mainly around inter-layer shearing strength, and due to experimental condition shortcoming, test difficulty it is larger, at
Many-sided reasons such as this is higher very pay close attention to the experimental study of interlayer shear fatigue behaviour less, and only individual documents are to bituminous pavement
It has carried out without the interlayer shear Fatigue Test Research under normal pressure.It is general directly referring to city when carrying out interlayer shear Fatigue Check
Shear structure strength factor in city's highway layout specification considers traffic loading fatigue effect.It must be pointed out this coefficient and traffic
The empirical relation that integrated load acts on number is unchanged all the year round, cannot sufficiently reflect complicated and diversified Coating combination item under the new situation
Situations such as part, asphalt pavement material and its structure combination, traffic loading.Therefore, it is necessary to carry out asphalt and its knot in a deep going way
The experimental study of structure Interlaminar shear strengths (especially shear fatigue performance).
Shearing strength can only be generally tested currently used for the test method of ground surface material and its structure Interlaminar shear strengths, no
It can be carried out shear fatigue test.These methods include tiltedly cut, staight scissors (no pressure (staight scissors containing concentric shafts), there is pressure), bending test etc.,
Have the defects that certain.If normal pressure in oblique scissor test is directly proportional to shearing force, Shear Strength Index not can truly reflect
The respective situation of cohesive force and frictional resistance, it is obtained for like frictional resistance angle.No normal pressure direct shear test mainly reflects that shearing strength refers to
Cohesive force in mark fails to reflect contribution of the frictional resistance to shearing strength.It is opposite with interlayer in composite beam type test specimen bending test
Displacement calculates inter-layer shearing strength indirectly, but unrelated with pressure.The direct shear test for having normal pressure should be carried out, obtain different normal pressures
Under shearing strength, to obtain interlayer adhesion and frictional resistance angle.But the direct shear test dress that can apply normal pressure existing at present
Shear fatigue performance test cannot be taken into account by setting.
Utility model content
The technical problems to be solved in the utility model is to overcome the deficiencies of the prior art and provide a kind of to simulate traffic lotus
It carries, reflect to complete and accurate that the face of varying environment temperature, normal pressure and shearing strength and shear fatigue performance under shearing mixes
The test device of material and its structure Interlaminar shear strengths.
In order to solve the above technical problems, the utility model uses following technical scheme:
The test device of a kind of paving mix and its structure Interlaminar shear strengths, including pedestal, shearing loads fixture, just
Charging assembly and at least one set of test specimen loading fixture are pressed, the pedestal is mounted on the loading bench that MTS etc is recycled loading equipemtn
On, the test specimen loading fixture is mounted on the base, and the test specimen is installed in test specimen loading fixture and the shear surface of test specimen leans on
The test specimen loading fixture lateral edge of nearly corresponding side, the shearing loads fixture is installed on test specimen and the shear surface of test specimen is positioned at cutting
Between power loads fixture lateral edge and the test specimen loading fixture lateral edge of corresponding side, the shearing loads fixture, which is located at MTS etc, to be followed
Between the loading bench of ring loading equipemtn and its load bar and shearing loads fixture and pedestal between formed load space, it is described just
Pressure charging assembly be installed in test specimen both ends of the surface and positive pressure charging assembly force direction perpendicular to test specimen shear surface.
As a further improvement of the above technical scheme:
The test specimen loading fixture includes lower loading Jia Tai, upper loading folder platform and loads bolt group, and the lower loading presss from both sides platform
It is mounted on the base, the upper loading folder platform is connect with lower loading folder platform by loading bolt group and presss from both sides platform with lower loading to be pressed from both sides jointly
Fill test specimen.
The shearing loads fixture includes lower loading bench, upper loading bench and loading bolt group, and the upper loading bench is by adding
Bolt group is carried to connect with lower loading bench and clamp test specimen jointly with lower loading bench.
The lower top surface and upper loading bench for loading the top surface for pressing from both sides platform and the upper bottom surface for loading folder platform and lower loading bench
Bottom surface is provided with the limiting groove for limiting to test specimen.
The pedestal is equipped with support rod, and collet is equipped on the support rod, is clamped on the collet for incuding
The displacement sensor of vertical shearing displacement.
The positive pressure charging assembly includes a pair of of pressing plate, an opposite side thread and a pair of of string formula strain gauge, a pair of of pressing plate
Set up separately in test specimen two ends and pass through the side thread connection respectively in test specimen two sides, two string formula strain gauges are solid respectively
It connects on the side thread of corresponding side, the both ends of each side thread are provided with tightening nut, a pair of when screwing tightening nut
Pressing plate presses to test specimen two ends face.
Backing plate is provided between the pressing plate and the end face of test specimen.
It is provided with pressure head on the pressing plate, the concave station with pressure head cooperation is provided on the backing plate.
The positive pressure charging assembly further includes a pair of of support leveling part, and a pair of support leveling part sets up separately in test specimen two sides and props up
Support is between pedestal and pressing plate.
Support leveling part includes leveling board, studdle and leveling nut, the studdle bottom end and pedestal spiral shell
Line connection, top and leveling board pivot bush unit, the leveling nut, which is threadedly coupled and is located at studdle, is supported in leveling board
The two sides of bottom surface, the pressing plate are carried on the leveling board of corresponding side.
Compared with the prior art, the advantages of the utility model are:
The paving mix of the utility model and its test device of structure Interlaminar shear strengths, including pedestal, shearing add
Fixture, positive pressure charging assembly and at least one set of test specimen loading fixture are carried, pedestal is mounted on MTS etc and is recycled adding for loading equipemtn
On microscope carrier, test specimen loading fixture is mounted on the base, and test specimen is installed in test specimen loading fixture and the shear surface of test specimen is close to phase
The test specimen loading fixture lateral edge of side is answered, shearing loads fixture is installed on test specimen and the shear surface of test specimen is located at shearing loading clamp
Have between lateral edge and the test specimen loading fixture lateral edge of corresponding side, shearing loads fixture is located at MTS etc and is recycled loading equipemtn
Load space is formed on loading bench between its load bar and between shearing loads fixture and pedestal, positive pressure charging assembly clamps
Test specimen both ends of the surface and positive pressure charging assembly force direction perpendicular to test specimen shear surface.In use, pedestal is mounted on
MTS etc is recycled on the loading bench of loading equipemtn, and test specimen loading fixture is mounted on the base, and test specimen is installed in test specimen dress
It carries on fixture, shearing loads fixture and positive pressure charging assembly is then installed in test specimen, be integrally placed at the recyclable load of MTS etc
With Control experiment temperature in the environmental cabinet of equipment, the normal pressure on shear surface is applied by positive pressure charging assembly first, is then led to
It crosses MTS etc and is recycled the load bar of loading equipemtn to shearing (disposable load or week on shearing loads fixture application shear surface
Phase property reloading), the influence of traffic loading is simulated, and then can reflect varying environment temperature, normal pressure and cut to complete and accurate
Paving mix or structure inter-layer shearing strength and shear fatigue performance under power.The utility model has filled up current road surface mixing
The blank of material and its structure interlayer shear fatigue performance study is beneficial to road worker further investigation in vehicle cyclic reverse loading
The work that the rule and interlayer materials shear fatigue for acting on lower road surface or the deformation generation of deck paving interlayer shear flow are destroyed
Mechanism, for based on anti-shearing fatigue behaviour road surface or deck paving interlayer optimization of material design analysis of experiments means are provided.
Detailed description of the invention
Fig. 1 is the schematic perspective view of the utility model.
Fig. 2 is the schematic perspective view (omitting positive pressure charging assembly) of the utility model.
Fig. 3 is the overlooking structure diagram of positive pressure charging assembly in the utility model (support leveling part is not shown).
Fig. 4 is the schematic view of the front view of support leveling part in the utility model.
Fig. 5 is leveling board structural schematic diagram in the utility model.
Each label indicates in figure:
1, pedestal；2, loads fixture is sheared；21, lower loading bench；22, upper loading bench；23, loading bolt group；3, positive pressure adds
Carry component；31, pressing plate；311, pressure head；32, side thread；33, string formula strain gauge；34, tightening nut；35, backing plate；351,
Concave station；36, support leveling part；361, leveling board；362, studdle；363, leveling nut；4, test specimen loading fixture；41, under
Load folder platform；42, upper loading presss from both sides platform；43, bolt group is loaded；5, support rod；6, collet.
Specific embodiment
The utility model is described in further details below with reference to Figure of description and specific embodiment.
Fig. 1 to Fig. 5 shows the one of the test device of the utility model paving mix and its structure Interlaminar shear strengths
Kind embodiment, including pedestal 1, shearing loads fixture 2, positive pressure charging assembly 3 and at least one set of test specimen loading fixture 4, pedestal 1 is pacified
On the loading bench that MTS etc is recycled loading equipemtn, test specimen loading fixture 4 is mounted on pedestal 1, and test specimen is installed in test specimen
In loading fixture 4 and the shear surface of test specimen is close to 4 lateral edge of test specimen loading fixture of corresponding side, shears loads fixture 2 and is installed in examination
On part and the shear surface of test specimen is located between shearing 2 lateral edge of loads fixture and 4 lateral edge of test specimen loading fixture of corresponding side, shearing
Loads fixture 2 be located at MTS etc be recycled loading equipemtn loading bench between its load bar and shearing loads fixture 2 with
Load space is formed between pedestal 1, positive pressure charging assembly 3 is installed in the both ends of the surface of test specimen and 3 force direction of positive pressure charging assembly
Perpendicular to the shear surface of test specimen.It is recycled on the loading bench of loading equipemtn in use, pedestal 1 is mounted on MTS etc, by test specimen
Loading fixture 4 is mounted on pedestal 1, and test specimen is installed on test specimen loading fixture 4, then will shearing loads fixture 2 and positive pressure
Charging assembly 3 is installed in test specimen, is integrally placed at MTS etc and is recycled in the environmental cabinet of loading equipemtn with Control experiment temperature, first
The normal pressure on the application shear surface of positive pressure charging assembly 3 is first passed through, the load bar of the recyclable loading equipemtn of MTS etc is then passed through
Shearing loads fixture 2 is applied and shears (disposable load or being repeated cyclically load) on shear surface, simulates the shadow of traffic loading
It rings, and then can reflect to complete and accurate the paving mix or structure shearing strength at intersection under varying environment temperature, normal pressure and shearing
Intensity and shear fatigue performance.The utility model has filled up current paving mix and its structure interlayer shear fatigue performance study
Blank, be beneficial to road worker further investigation under the action of vehicle cyclic reverse loading road surface or deck paving interlayer shear flow
The working mechanism that the rule and interlayer materials shear fatigue that dynamic deformation generates are destroyed, for the road surface based on anti-shearing fatigue behaviour
Or the design of deck paving interlayer optimization of material provides analysis of experiments means.
In the present embodiment, test specimen loading fixture 4 includes lower loading folder platform 41, upper loading folder platform 42 and loads bolt group 43,
Lower loading folder platform 41 is mounted on pedestal 1, upper loadings folder platform 42 connect with lower loading folder platform 41 by loading bolt group 43 and with
Lower loading folder platform 41 clamps test specimen jointly.In the present embodiment, test specimen loading fixture 4 is equipped with two groups, i.e., there are two shearings for test specimen tool
Face, shearing loads fixture 2 are located between two groups of test specimen loading fixtures 4, and test specimen is installed in lower loading folder platform 41 and upper loading folder platform
It is locked between 42 by loading bolt group 43, when MTS etc is recycled the load bar force of loading equipemtn, shears loads fixture 2
To the part force between two shear surface of test specimen, it can reflect to complete and accurate the road under varying environment temperature, normal pressure and shearing
Face mixture or structure inter-layer shearing strength and shear fatigue performance.
In the present embodiment, shearing loads fixture 2 includes lower loading bench 21, upper loading bench 22 and loading bolt group 23, is above added
Microscope carrier 22 connect with lower loading bench 21 by loading bolt group 23 and clamps test specimen jointly with lower loading bench 21.In the structure, under
Loading bench 21 and upper loading bench 22 are installed in test specimen upper and lower surface and are locked by loading bolt group 23, and MTS etc is recyclable to be added
Thrusting action is generated to upper loading bench 22 when carrying the load bar force of equipment, to realize to the part between two shear surface of test specimen
Force.
In the present embodiment, the top surface of the bottom surface and lower loading bench 21 of the lower top surface for loading folder platform 41 and upper loading folder platform 42
The limiting groove for limiting to test specimen is provided with the bottom surface of upper loading bench 22.The setting of the limiting groove is on the one hand to examination
Part forms limit, prevents test process test specimen from shifting, on the other hand improves the convenience of installation.
In the present embodiment, pedestal 1 is equipped with support rod 5, and collet 6 is equipped on the support rod 5, is pressed from both sides on the collet 6
Equipped with the displacement sensor (not illustrating displacement sensor in figure) for incuding vertical shearing displacement.The displacement sensor is anti-in time
Change in displacement when feedback shearing load, convenient for obtaining shearing strength and shear fatigue performance data.
In the present embodiment, positive pressure charging assembly 3 includes a pair of of pressing plate 31, an opposite side thread 32 and a pair of of string formula strain
Meter 33, a pair of of pressing plate 31 set up separately in test specimen two ends and pass through the connection of side thread 32, two strings respectively in test specimen two sides
Formula strain gauge 33 is respectively and fixedly connected on the side thread 32 of corresponding side, and the both ends of each side thread 32 are provided with tightening nut
34, when screwing tightening nut 34, a pair of of pressing plate 31 presses to test specimen two ends face.In the structure, a pair of of pressing plate 31 and an opposite side spiral shell
Line pull rod 32 forms mount structure after being connected with each other, and pressing plate 31 presses to test specimen two ends face when screwing tightening nut 34, and pressing plate 31
Reaction force can be transmitted on side thread 32 by nut 34, it is big to feed back normal pressures by two string formula strain gauges 33
It is small, to realize the control of normal pressure size.
In the present embodiment, backing plate 35 is provided between pressing plate 31 and the end face of test specimen.The setting of the backing plate 35 makes both ends
The normal pressure of pressing plate 31 can uniformly be transferred to the end face of test specimen, improve the accuracy of test.
In the present embodiment, it is provided with pressure head 311 on pressing plate 31, the concave station cooperated with pressure head 311 is provided on backing plate 35
351.In the structure, pressure head 311 is set as cone cell, and the recess portion of concave station 351 mutually should be cone cell, passes through pressure head 311 and concave station 351
Cooperation realizes that positive pressure applies.
In the present embodiment, positive pressure charging assembly 3 further includes a pair of of support leveling part 36, and a pair of support leveling part 36 sets up separately
Test specimen two sides are simultaneously supported between pedestal 1 and pressing plate 31.In the structure, support leveling 36 one side of part forms branch to pressing plate 31
Support, reducing the gravity of positive pressure charging assembly 3 itself influences, and is on the other hand being installed into and the height of pressing plate 31 can be adjusted, with
Guarantee the levelness of positive pressure.
In the present embodiment, support leveling part 36 includes leveling board 361, studdle 362 and leveling nut 363, supports spiral shell
362 bottom end of bar is threadedly coupled with pedestal 1,361 pivot bush unit of top and leveling board, leveling nut 363 and 362 screw thread of studdle
It connects and is located at and be supported in 361 bottom surface of leveling board, the two sides of pressing plate 31 are carried on the leveling board 361 of corresponding side.In the structure,
362 bottom end of studdle is threadedly coupled with pedestal 1, and leveling nut 363 is mounted on studdle 362,362 top of studdle
Pass through the rotation liter of leveling nut 363 so that leveling board 361 is carried in leveling nut 363 with 361 pivot bush unit of leveling board
Drop realizes that leveling board 361 levels, so that indirect belt dynamic pressure plate 31 levels.
Although the utility model is disclosed as above with preferred embodiment, it is not intended to limit the utility model.It is any
Those skilled in the art, in the case where not departing from technical solutions of the utility model range, all using the disclosure above
Technology contents many possible changes and modifications are made to technical solutions of the utility model, or be revised as the equivalent of equivalent variations
Embodiment.Therefore, all contents without departing from technical solutions of the utility model, according to the utility model technical spirit to the above reality
Any simple modifications, equivalents, and modifications that example is done are applied, should all be fallen in the range of technical solutions of the utility model protection.
Claims (10)
1. the test device of a kind of paving mix and its structure Interlaminar shear strengths, it is characterised in that: including pedestal (1), cut
Power loads fixture (2), positive pressure charging assembly (3) and at least one set of test specimen loading fixture (4), the pedestal (1) be mounted on MTS it
Class is recycled on the loading bench of loading equipemtn, and the test specimen loading fixture (4) is mounted on pedestal (1), and the test specimen is installed in
In test specimen loading fixture (4) and the shear surface of test specimen is close to test specimen loading fixture (4) lateral edge of corresponding side, and the shearing loads
Fixture (2) is installed on test specimen and the shear surface of test specimen is located at shearing loads fixture (2) lateral edge and the test specimen of corresponding side loads folder
Have between (4) lateral edge, shearing loads fixture (2) is located at the loading bench and its load bar that MTS etc is recycled loading equipemtn
Between and formed between shearing loads fixture (2) and pedestal (1) and load space, the positive pressure charging assembly (3) is installed in test specimen
Both ends of the surface and positive pressure charging assembly (3) force direction perpendicular to test specimen shear surface.
2. the test device of paving mix according to claim 1 and its structure Interlaminar shear strengths, it is characterised in that:
The test specimen loading fixture (4) includes lower loading folder platform (41), upper loading folder platform (42) and loads bolt group (43), the lower dress
It carries folder platform (41) to be mounted on pedestal (1), upper loading folder platform (42) presss from both sides platform by loading bolt group (43) and lower loading
(41) it connects and clamps test specimen jointly with lower loading folder platform (41).
3. the test device of paving mix according to claim 2 and its structure Interlaminar shear strengths, it is characterised in that:
The shearing loads fixture (2) includes lower loading bench (21), upper loading bench (22) and loading bolt group (23), the upper loading bench
(22) it is connect with lower loading bench (21) by loading bolt group (23) and clamps test specimen jointly with lower loading bench (21).
4. the test device of paving mix according to claim 3 and its structure Interlaminar shear strengths, it is characterised in that:
Top surface and the upper load of the lower top surface for loading folder platform (41) and the upper bottom surface for loading folder platform (42) and lower loading bench (21)
The bottom surface of platform (22) is provided with the limiting groove for limiting to test specimen.
5. the test device of paving mix according to claim 4 and its structure Interlaminar shear strengths, it is characterised in that:
The pedestal (1) is equipped with support rod (5), is equipped with collet (6) on the support rod (5), clamps on the collet (6) useful
In the displacement sensor of induction vertical shearing displacement.
6. the test device of paving mix according to any one of claim 1 to 5 and its structure Interlaminar shear strengths,
It is characterized by: the positive pressure charging assembly (3) includes that a pair of of pressing plate (31), an opposite side thread (32) and a pair of of string formula are answered
Become meter (33), a pair of of pressing plate (31) sets up separately in test specimen two ends and passes through the side thread (32) respectively in test specimen two sides
Connection, two string formula strain gauges (33) are respectively and fixedly connected on the side thread (32) of corresponding side, each side thread (32)
Both ends are provided with tightening nut (34), and when screwing tightening nut (34), a pair of of pressing plate (31) presses to test specimen two ends face.
7. the test device of paving mix according to claim 6 and its structure Interlaminar shear strengths, it is characterised in that:
Backing plate (35) are provided between the pressing plate (31) and the end face of test specimen.
8. the test device of paving mix according to claim 7 and its structure Interlaminar shear strengths, it is characterised in that:
It is provided with pressure head (311) on the pressing plate (31), the concave station with the pressure head (311) cooperation is provided on the backing plate (35)
(351).
9. the test device of paving mix according to claim 7 or 8 and its structure Interlaminar shear strengths, feature exist
In: the positive pressure charging assembly (3) further includes a pair of of support leveling part (36), and a pair of support leveling part (36) is set up separately in test specimen two
Side is simultaneously supported between pedestal (1) and pressing plate (31).
10. the test device of paving mix according to claim 9 and its structure Interlaminar shear strengths, feature exist
In: support leveling part (36) includes leveling board (361), studdle (362) and leveling nut (363), the support spiral shell
Bar (362) bottom end is threadedly coupled with pedestal (1), top and leveling board (361) pivot bush unit, the leveling nut (363) and branch
Support screw rod (362), which is threadedly coupled and is located at, is supported in leveling board (361) bottom surface, and the two sides of the pressing plate (31) are carried on corresponding side
Leveling board (361) on.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108956334A (en) * | 2018-08-14 | 2018-12-07 | 长沙理工大学 | The test device of paving mix and its structure Interlaminar shear strengths |
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| CN108956334A (en) * | 2018-08-14 | 2018-12-07 | 长沙理工大学 | The test device of paving mix and its structure Interlaminar shear strengths |
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