CN107831070A - A kind of compression shear test device of composite pavement structure intensity and fatigue - Google Patents
A kind of compression shear test device of composite pavement structure intensity and fatigue Download PDFInfo
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- 239000002131 composite material Substances 0.000 title claims abstract description 90
- 238000012360 testing method Methods 0.000 title claims abstract description 50
- 230000006835 compression Effects 0.000 title claims abstract description 30
- 238000007906 compression Methods 0.000 title claims abstract description 30
- 230000007613 environmental effect Effects 0.000 claims abstract description 10
- 238000010276 construction Methods 0.000 claims abstract description 9
- 238000000034 method Methods 0.000 claims abstract description 6
- 238000009661 fatigue test Methods 0.000 claims description 8
- 238000002474 experimental method Methods 0.000 claims description 6
- 238000010998 test method Methods 0.000 claims description 6
- 238000007493 shaping process Methods 0.000 claims description 4
- 125000004122 cyclic group Chemical group 0.000 claims description 2
- 238000013461 design Methods 0.000 abstract description 4
- 238000004088 simulation Methods 0.000 abstract 1
- 239000000463 material Substances 0.000 description 15
- 239000010426 asphalt Substances 0.000 description 5
- 239000002344 surface layer Substances 0.000 description 5
- 150000001875 compounds Chemical class 0.000 description 4
- 230000006378 damage Effects 0.000 description 4
- 230000002349 favourable effect Effects 0.000 description 3
- 239000010410 layer Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 238000004154 testing of material Methods 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000008030 elimination Effects 0.000 description 2
- 238000003379 elimination reaction Methods 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 239000011229 interlayer Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000001739 density measurement Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009533 lab test Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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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
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
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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
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0026—Combination of several types of applied forces
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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
- G01N2203/0058—Kind of property studied
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
- G01N2203/0073—Fatigue
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
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- General Health & Medical Sciences (AREA)
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Abstract
The invention discloses a kind of composite pavement structure intensity and the compression shear test device of fatigue, structural strength and the fatigue life of composite pavement are evaluated and estimated by indoor compression-shear test.The device includes loading system, pilot system and control system.Wherein, loading system is hydraulic servo MTS testing machines；Pilot system includes spherical bearing, pressure head, composite samples, snap ring, base and environmental cabinet successively from top to bottom, spherical bearing tightly engages with MTS loading systems and pressure head respectively, composite samples three-dimensional coordinate is fixed by snap ring and base, composite samples are loaded by environmental cabinet Adjustment Tests humiture, and by pressure head；Stress, the strain data of testing process are handled by control system, the compression-shear test test of composite samples may finally be realized.The device can failure mode and mechanism of the accurate simulation composite pavement structure under traffic load, the design and construction for instructing composite pavement structure is had important practical significance and construction value.
Description
Technical field
The invention belongs to field of road, the compression shear test for being related to a kind of composite pavement structure intensity and fatigue fills
Put.
Background technology
The combining form of pavement structure has a lot, can be divided into three classes according to the otherness of each layer road-making material rigidity：Quan Rou
Formula (complete thick formula) pavement structure, Semi-Rigid Pavement Structure and Rigid-flexible composite of the road structure.Wherein, Semi-Rigid Pavement Structure and just
Soft composite pavement structure is referred to as composite pavement structure, most of because the limitation of Natural Resources in China and economic condition
Highway, urban road and highway at different levels are composite structure.
With reference to current Chinese code of practice, intensity and fatigue life are two important indicators of Pavement Design, are referred to for the two
Target test method is a lot：Unconfined compressive strength realizes the strength test of different materials using the load mode of uniaxial compression,
But its research object is only limitted to material, and the load mode of uniaxial compression may not meet actual road surface stressing conditions；Penetration test
Shearing strength and the fatigue test of asphalt can be realized under the conditions of 60 DEG C, but its purpose is to evaluate pitch mixing
The anti-shear performance of material；Triaxial shear test can realize the asphalt mixture shearing experiment under the conditions of confined pressure, but it is studied
Object is also only single material, and its instrument essence is expensive, complex operation, and the value of confined pressure also remains to be discussed.Combined type asphalt road
Face interlayer shear-strength test breaches the limitation of homogenous material, is innovated for Rigid-flexible composite of the road structure, but its purpose
It is the performance for evaluating interlayer cementing material.
In a word, existing test method is limited to the performance of single load and material, ignores structure to material property
Influence, also do not account for the complex stress condition that real roads structure is born.In fact, in addition to material property, load and
State, temperature humidity, structural thickness, combining form etc. can influence the service life of pavement structure, composite pavement structure
Failure mode also absolutely not homogenous material destroy or interfacial shear slip.Therefore, existing test method is also difficult to evaluate exactly
Or estimate structural strength and the fatigue life of composite pavement.
In summary, the present invention is multiple to reduce by compression-shear load state, environmental Kuznets Curves, structure combination and small size pressure head
The actual military service situation of box-like pavement structure, can more disclose Rigid-flexible composite of the road structural damage mode and mechanism, to instructing
Highway layout has important realistic meaning and construction value with construction, extension road service life.
The content of the invention
It is an object of the invention to using prior art, develop a kind of composite pavement structure intensity and fatigue
Compression shear test device, to solve the problems, such as that composite pavement structure lacks rational structural strength and fatigue behaviour evaluation method.
To achieve the above object, the technical scheme is that：A kind of compression shear of composite pavement structure intensity and fatigue
Test device, it is characterised in that including loading system, pilot system, control system；Described loading system is hydraulic servo
MTS testing machines；Described pilot system includes spherical bearing, pressure head, composite samples, snap ring, base and ring successively from top to bottom
Border case, wherein, spherical bearing is tightly engaged with MTS testing machines and pressure head respectively as transferring device by screw thread, snap ring welding
On base, spherical bearing, pressure head, composite samples, snap ring and base are in the inside of environmental cabinet；The control system is used to control
Loading system processed integrally carries out compression-shear test to composite samples；
The pressure head diameter is 26mm, and pressure head and base are in 26 ° of 34 ' angle with horizontal direction, the spherical bearing
Pressure head is allowed to be rotated between ± 5 °；
The environmental cabinet can control the temperature and humidity in test process, the composite samples composite samples as needed
Basic unit and surface thickness can be 4+4cm, 4+5cm and 4+6cm structure combining form, can pass through indoor shaping or live drill core
Obtain；
As a kind of total inventive concept, except the compression shear of a kind of above-mentioned composite pavement structure intensity and fatigue tests dress
Outside putting, the present invention also provides its detailed method of testing, and its step includes：
1st, structure compression shear strength test procedure：End portion treatment is carried out to composite samples, keeps its smooth, smooth and is placed on
Fixed in the snap ring of loading bench, adjustment spherical bearing makes pressure head parallel to composite samples upper surface, using strain controlling pattern pair
Composite samples are loaded, when peak value occurs in the load applied, it is believed that composite construction reaches the pole of its resistance capacity to deformation
Limit, this load peak value is the compression shear failing load of test specimen, and its structure compression shear strength can be calculated as follows：
In formula, FmaxTo load load peak value, r is that pressure head contacts radius of circle with test specimen；
2nd, structure pressure shear fatigue test step：End portion treatment is carried out to composite samples, keeps its smooth, smooth and is placed on
Fixed in the snap ring of loading bench, adjustment spherical bearing makes pressure head parallel to composite samples upper surface, and makes pressure head and composite samples
In the critical condition that will be contacted, by loading system composite samples are applied with the semisinusoidal cyclic load of interval, is loaded
Frequency is 10Hz, and intermittent time 0.9s, load is some fixed value in 0.2~0.8 times of failing load, and test specimen occurs
Load cycle-index during destruction is the structure compression shear fatigue life of composite samples under the stress level.
Compared with prior art, beneficial effects of the present invention are as follows：
The compression shear test device of a kind of composite pavement structure intensity provided by the invention and fatigue, breaches conventional experiment
Method realizes composite pavement in different temperatures, different humidity, different structure group only for the limitation of single load or material
Structure compression-shear test under the conditions of conjunction etc., reduces true responsive state and damage of the composite pavement structure under traffic load
Form, design and construction for composite pavement structure provide important research technique and appraisal procedure, and experiment sets more section
Learn；
Pressure head and base provided by the invention, by the inclination angle for setting 26 ° 34 ', it is possible to achieve composite samples are carried out double
Loading to least favorable condition.In view of engineering practice, many road items design objectives are satisfied by requiring, but still
Occur destroying in various degree in service life, its main cause is that traditional evaluation index deviation is conservative, and experimental condition is single, right
Road structure mechanical property, which is estimated, has deviation.Largely result of study shows, the pavement structure under compression-shear load comprehensive function
It is more prone to destroy, also more meets road structure actual loading situation, when horizontal force coefficient=when 0.5 (horizontal loading/erect
To load=0.5), for the least favorable state of composite construction, pass through Mechanics Calculation, inclination alpha=arctan0.5=26 °
34’.Therefore, the present invention considers the bidirectional load state under the conditions of least favorable, and loading status is more scientific.
Pressure head provided by the invention, according to result of finite element, loaded using small size pressure head (diameter 26mm).
It is a bit that dispute is had much in the laboratory test of this area that how confined pressure size, which is set, due to that can not determine that bituminous paving really encloses
Pressure condition, confined pressure value size is difficult to reach common understanding always.The present invention by small size pressure head come reduce composite samples by
Area is carried, enables composite samples external structure and provides real confined pressure constraint as actual road surface for stand under load area；On the other hand examine
Consider dimensional effect, pressure head diameter at least should be test specimen and gather materials 2 times of nominal maximum aggregate size, therefore enter using the pressure head of 26mm diameters
Row loading so that confined pressure constraint is more scientific.
It composite samples provided by the invention, can be obtained, tried by the mode such as indoor shaping or road surface scene core boring sampling
Test and require lower；
Spherical bearing provided by the invention, it is allowed to which pressure head rotates between ± 5 °, can effectively eliminate composite samples end
The test error that out-of-flatness is brought, is tested through Experimental Comparison, and its result of the test coefficient of variation is than being not provided with the small of spherical bearing
5%~8%；
Pilot system provided by the invention, simple to operate, methodological science, result are stable, are easy in scientific research and Practical Project
Promoted the use of in.
Brief description of the drawings
Fig. 1 is test device schematic diagram of the present invention；
Fig. 2 is loading bench and composite samples schematic diagram；
Fig. 3 is structure compression-shear load-time plot that the embodiment of the present invention 1 measures；
Fig. 4 is structure press-shear deformation-frequency curve figure that the embodiment of the present invention 1 measures；
Description of reference numerals：1st, spherical bearing；2nd, pressure head；3rd, composite samples surface layer；4th, composite samples basic unit；5th, snap ring；
6th, base；7th, environmental cabinet；8th, MTS Material Testing Machine；9th, control system.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other under the premise of creative work is not made
Embodiment, belong to the scope of protection of the invention.
Embodiment
Make double-deck rut plate die trial by oneself, the present embodiment selects the semi-rigid type base flexible cladding composite pavement knot of indoor shaping
Illustrated exemplified by structure test specimen, other composite structure test specimens are by that analogy.Comprise the following steps that：
(1) prepared by composite samples basic unit, and semirigid inorganic combination stabilizing material is poured in lower floor's rut plate die trial, is shaken
Placed after puddling reality 45 minutes, cutting wharf's pavement quality then is carried out to its upper surface, the health of Standard Curing room is put into 7 days, treats it
Unconfined compressive strength is taken out after meeting code requirement from health-preserving chamber.
(2) tack coat makes, and ensures the drying and cleaning on semi-rigid type base surface, 1.4kg/m is pressed in its upper surface3Uniformly
Spread SBS modified pitch, exist side by side and be engraved in the uniform spread of asphalt surface continuation, press 13.2-19mm coarse aggregate, fill coarse aggregate
Divide and wrap up in attached pitch binder applied.
(3) composite samples surface layer is made, and after layer to be bonded is cooled to room temperature, layer die trial is added in lower floor's rut die trial,
And add the hot-mix asphalt mixture being stirred, the compacting of rolling former rolling is put into after being plugged and pounded by code requirement.
(4) composite samples make, after good compound rut plate to be formed is cooled to room temperature, using core boring sampling machine from compound
Core sample is taken out in rut plate, the end of core sample, as required combined type test specimen are polished using sander.Composite samples are carried out
Density measurement, ensure the Forming Quality of composite samples.
(5) test material preparation is completed, as shown in Figure 2.
(6) composite samples Temperature and Humidity Control, the composite samples of forming is put into MTS environmental cabinets 7 and carry out humiture environment
Control, 4~8 hours duration.
(7) structure compression shear strength experiment is carried out, such as Fig. 1, shown in Fig. 2, end portion treatment is carried out to composite samples, kept compound
Test specimen surface layer 3 and the upper and lower surface of composite samples basic unit 4 it is smooth, smooth, and be placed in the snap ring 5 of loading bench 6 fixed, adjustment
Spherical bearing 1 makes the contact surface of pressure head 2 control MTS Material Testing Machine 8 to compound by control system 9 parallel to composite samples
Test specimen is loaded.Using strain controlling pattern, when there is peak value in the load applied, it is believed that composite construction reaches its resistance
The limit of deformability, this load peak value are the compression shear failing load of test specimen, and its structure compression shear strength can be calculated as follows：In formula, FmaxTo load load peak value, r is that pressure head contacts radius of circle with test specimen；
As shown in figure 3, load versus time curve during the present embodiment experiment, it is known that the compression-shear load of embodiment
Extreme value is 1.615KN, substitutes into calculation formula：In can to obtain the structure compression shear strength of the present embodiment be 2.72Mpa.Repeat
Above-mentioned steps, 5 parallel tests are carried out, its average value is taken after abnormal value elimination, obtains the structure pressure of the present embodiment composite samples
Intensity is cut, as shown in table 1.
The composite samples structure compression shear strength of table 1
(8) structure pressure shear fatigue test, as shown in Figure 1 and Figure 2, end portion treatment is carried out to composite samples, keeps composite samples
Surface layer 3 and the upper and lower surface of composite samples basic unit 4 it is smooth, smooth, and be placed in the snap ring 5 of loading bench 6 fixed, adjustment is spherical
Bearing 1 makes the contact surface of pressure head 2 parallel to composite samples, and makes pressure head 2 critical in that will contact with composite samples surface layer 4
State, the semisinusoidal for controlling MTS Material Testing Machine 8 to carry out having interval to composite samples by control system 9 circulate ripple and loaded, add
Carrier frequency rate is 10Hz, and intermittent time 0.9s, load is some fixed value in 0.2~0.8 times of failing load, and test specimen goes out
Load cycle-index when now destroying is the structure compression shear fatigue life of composite samples under the stress level.
As shown in figure 4, effect number of the present embodiment composite samples under 0.5 times of maximal destruction load, it is known that its fatigue
Life-span is 10013 times.Repeat the above steps, do 5 parallel tests, take its average value after abnormal value elimination, obtain the present embodiment
The structure fatigue life of composite samples, as shown in table 2.
The composite samples structure compression shear fatigue life of table 2
Note：Load/compression shear ultimate load that stress ratio=structure pressure shear fatigue test applies
While there has been shown and described that part of the embodiment of the invention, for one of ordinary skill in the art
Speech, it will be appreciated that without departing from the principles and spirit of the present invention these embodiments are carried out with a variety of changes, modification, is replaced
And modification, the scope of the present invention is defined by the appended.
Claims (2)
- A kind of 1. compression shear test device of composite pavement structure intensity and fatigue, it is characterised in that：Including loading system, experiment System, control system；Described loading system is hydraulic servo MTS testing machines；Described pilot system is wrapped successively from top to bottom Spherical bearing, pressure head, composite samples, snap ring, base and environmental cabinet are included, wherein, spherical bearing passes through screw thread as transferring device Tightly engaged respectively with MTS testing machines and pressure head, snap ring is welded on base, spherical bearing, pressure head, composite samples, snap ring and Base is in the inside of environmental cabinet；The control system is used for controlled loading system and carries out compression shear structural behaviour examination to composite samples Test；The pressure head diameter is 26mm, and pressure head and base are in 26 ° of 34 ' angle with horizontal direction, and the spherical bearing allows Pressure head rotates between ± 5 °；The environmental cabinet can control the temperature and humidity in test process, and the composite samples can pass through indoor shaping or scene Drill core acquisition, composite samples basic unit as needed and surface thickness can be 4+4cm, 4+5cm and 4+6cm structure combination shape Formula；
- 2. the compression shear test device of a kind of composite pavement structure intensity according to claim 1 and fatigue, its feature exist In structure compression shear strength and fatigue test comprise the following steps respectively：(1) structure compression shear strength test procedure：End portion treatment is carried out to composite samples, keeps its smooth, smooth and be placed on to add Fixed in the snap ring of microscope carrier, adjustment spherical bearing makes pressure head parallel to composite samples upper surface, using strain controlling pattern to multiple Closing test specimen to be loaded, when peak value occurs in the load applied, it is believed that composite construction reaches the limit of its resistance capacity to deformation, This load peak value is the compression shear failing load of test specimen, and its structure compression shear strength can be calculated as follows：<mrow> <mi>&sigma;</mi> <mo>=</mo> <mfrac> <msub> <mi>F</mi> <mrow> <mi>m</mi> <mi>a</mi> <mi>x</mi> </mrow> </msub> <mrow> <msup> <mi>&pi;r</mi> <mn>2</mn> </msup> </mrow> </mfrac> </mrow>In formula, FMa YiTo load load peak value, r is that pressure head contacts radius of circle with test specimen；(2) structure pressure shear fatigue test step：End portion treatment is carried out to composite samples, keeps its smooth, smooth and be placed on to add Fixed in the snap ring of microscope carrier, adjustment spherical bearing makes pressure head parallel to composite samples upper surface, and makes at pressure head and composite samples In the critical condition that will be contacted, by loading system composite samples are applied with the semisinusoidal cyclic load of interval, loading is frequently Rate is 10Hz, and intermittent time 0.9s, load is some fixed value in 0.2~0.8 times of failing load, and test specimen is broken The load cycle-index of bad when is the structure compression shear fatigue life of composite samples under the stress level.
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Cited By (5)
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| CN110411873A (en) * | 2019-08-12 | 2019-11-05 | 长沙理工大学 | A kind of method of preferred Rigid-flexible composite of the road wheel tracking test |
| CN110411860A (en) * | 2019-07-04 | 2019-11-05 | 广州大学 | Shearing test device and test method between a kind of asphalt pavement structural layer |
| CN111624099A (en) * | 2020-04-16 | 2020-09-04 | 重庆大学 | Composite material laminated plate II type fatigue layering test device suitable for high and low temperature environment |
| CN113075037A (en) * | 2021-03-26 | 2021-07-06 | 武汉建工集团股份有限公司 | Intelligent road construction traffic load engineering detection test system and method |
| CN114323977A (en) * | 2021-12-28 | 2022-04-12 | 长安大学 | Continuous damage testing system and method for water-stable macadam foundation |
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