CN107831070B - Compression shear testing device for structural strength and fatigue of composite pavement - Google Patents
Compression shear testing device for structural strength and fatigue of composite pavement Download PDFInfo
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- 238000012360 testing method Methods 0.000 title claims abstract description 145
- 239000002131 composite material Substances 0.000 title claims abstract description 110
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- 238000000034 method Methods 0.000 claims abstract description 9
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- 239000010410 layer Substances 0.000 claims description 15
- 239000002344 surface layer Substances 0.000 claims description 10
- 238000009661 fatigue test Methods 0.000 claims description 6
- 238000000465 moulding Methods 0.000 claims description 4
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- 238000012546 transfer Methods 0.000 claims description 2
- 238000011056 performance test Methods 0.000 claims 1
- 238000013461 design Methods 0.000 abstract description 5
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- 239000000203 mixture Substances 0.000 description 5
- 238000011160 research Methods 0.000 description 4
- 238000010998 test method Methods 0.000 description 4
- 238000011156 evaluation Methods 0.000 description 3
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- 239000011229 interlayer Substances 0.000 description 3
- 230000002411 adverse Effects 0.000 description 2
- 230000002457 bidirectional effect Effects 0.000 description 2
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- 238000003892 spreading Methods 0.000 description 2
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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
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Abstract
The invention discloses a compression shear testing device for structural strength and fatigue of a composite pavement. The device comprises a loading system, a test system and a control system. Wherein the loading system is a hydraulic servo MTS tester; the test system sequentially comprises a spherical support, a pressure head, a composite test piece, a clamping ring, a base and an environment box from top to bottom, wherein the spherical support is respectively and tightly meshed with the MTS loading system and the pressure head, the three-dimensional coordinates of the composite test piece are fixed through the clamping ring and the base, the temperature and the humidity of the test are adjusted through the environment box, and the pressure head loads the composite test piece; and the stress and strain data in the test process are processed through the control system, so that the compression shear test of the composite test piece can be finally realized. The device can accurately simulate the damage mode and mechanism of the composite pavement structure under the driving load, and has important practical significance and engineering value for guiding the design and construction of the composite pavement structure.
Description
Technical Field
The invention belongs to the field of road engineering, and relates to a compression shear testing device for structural strength and fatigue of a composite pavement.
Background
The combination forms of pavement structures are numerous, and three types can be classified according to the rigidity difference of each layer of road construction materials: fully flexible (fully thick) pavement structures, semi-rigid pavement structures, and rigid-flexible composite pavement structures. The semi-rigid pavement structure and the rigid-flexible composite pavement structure are collectively called as a composite pavement structure, and most of expressways, urban roads and all levels of roads are composite structures because of the limitation of natural resources and economic conditions in China.
Referring to the current specifications in China, the strength and the fatigue life are two important indexes of pavement design, and the test methods for the two indexes are many: the unconfined compressive strength realizes the strength test of different materials by adopting a uniaxial compression loading mode, but the research object is limited to the materials, and the uniaxial compression loading mode does not necessarily conform to the actual pavement stress condition; the penetration test can realize the shear strength and fatigue test of the asphalt mixture at 60 ℃, but the aim is to evaluate the shear resistance of the asphalt mixture; the triaxial shear test can realize the shear test of the asphalt mixture under the confining pressure condition, but the research object is only a single material, and the instrument is smart and expensive, the operation is complex, and the value of confining pressure is also to be questionable. The interlayer shearing test of the composite asphalt pavement breaks through the limitation of a single material, innovates a rigid-flexible composite pavement structure, and aims to evaluate the performance of an interlayer cementing material.
In a word, the existing test methods are limited to single load and material performance, influence of the structure on the material performance is ignored, and complex stress states born by a real road structure are not considered. In fact, besides the material performance, the load size and state, the temperature and humidity, the structure thickness, the combination form and the like can influence the service life of the pavement structure, and the damage form of the composite pavement structure is not single material damage or interlayer shearing slip. Therefore, the existing test method is difficult to accurately evaluate or estimate the structural strength and fatigue life of the composite pavement.
In summary, the invention restores the actual service condition of the composite pavement structure through the compression shear load state, the environment control, the structure combination and the small-size pressure head, and can reveal the damage mode and mechanism of the rigid-flexible composite pavement structure, thereby having important practical significance and engineering value for guiding road design and construction and prolonging the service life of the road.
Disclosure of Invention
The invention aims to develop a compression shear testing device for the structural strength and fatigue of a composite pavement by utilizing the prior art so as to solve the problem that the composite pavement structure lacks a reasonable structural strength and fatigue performance evaluation method.
In order to achieve the above purpose, the technical scheme of the invention is as follows: the compression shear testing device for the structural strength and fatigue of the composite pavement is characterized by comprising a loading system, a testing system and a control system; the loading system is a hydraulic servo MTS tester; the test system sequentially comprises a spherical support, a pressure head, a composite test piece, a clamping ring, a base and an environment box from top to bottom, wherein the spherical support is used as a transfer device and is respectively and tightly meshed with the MTS tester and the pressure head through threads, the clamping ring is welded on the base, and the spherical support, the pressure head, the composite test piece, the clamping ring and the base are all arranged in the environment box; the control system is used for controlling the loading system to perform a compression shear test on the whole composite test piece;
the diameter of the pressure head is 26mm, the pressure head and the base form an included angle of 26 degrees 34' with the horizontal direction, and the spherical support allows the pressure head to rotate within +/-5 degrees;
the environment box can control the temperature and the humidity in the test process, the thickness of the base layer and the surface layer of the composite test piece can be in a structure combination form of 4+4cm, 4+5cm and 4+6cm according to the requirements, and the composite test piece can be obtained through indoor molding or on-site core drilling;
as a general inventive concept, besides the above-mentioned compression shear testing device for structural strength and fatigue of a composite pavement, the present invention further provides a detailed testing method thereof, which comprises the following steps:
1. the structural compressive shear strength test step comprises the following steps: the method comprises the steps of carrying out end treatment on a composite test piece, keeping the composite test piece smooth and flat, placing the composite test piece in a clamping ring of a loading table for internal fixation, adjusting a spherical support to enable a pressure head to be parallel to the upper surface of the composite test piece, loading the composite test piece by adopting a strain control mode, and when an applied load has a peak value, considering that a composite structure reaches the limit of deformation resistance, wherein the load peak value is the compression shear damage load of the test piece, and calculating the structural compression shear strength of the test piece according to the following formula:
wherein F is max For loading load peak value, r is the contact radius of the pressure head and the test piece;
2. structural compression shear fatigue test steps: the method comprises the steps of carrying out end treatment on a composite test piece, keeping the composite test piece smooth and flat, placing the composite test piece in a clamping ring of a loading table for internal fixation, adjusting a spherical support to enable a pressure head to be parallel to the upper surface of the composite test piece, enabling the pressure head to be in a critical state to be in contact with the composite test piece, applying intermittent half-sine cyclic load to the composite test piece through a loading system, wherein the loading frequency is 10Hz, the intermittent time is 0.9s, the load size is 0.2-0.8 time of a certain fixed value in the destructive load, and the number of load cycles when the test piece is destroyed is the structural compression shear fatigue life of the composite test piece under the stress level.
Compared with the prior art, the invention has the following beneficial effects:
the compression shear test device for the structural strength and fatigue of the composite pavement breaks through the limitation that the traditional test method is only aimed at single load or material, realizes the structural compression shear test of the composite pavement under the conditions of different temperatures, different humidities, different structural combinations and the like, reduces the real response state and the damage form of the composite pavement structure under the running load, provides an important test means and an evaluation method for the design and construction of the composite pavement structure, and is more scientific in test setting;
according to the pressure head and the base provided by the invention, the bidirectional adverse condition loading of the composite test piece can be realized by setting the inclination angle of 26 degrees 34'. Considering the actual engineering situation, various design indexes of a plurality of roads meet the requirements, but damage to different degrees still occurs within the service life, and the main reason is that the traditional evaluation indexes are biased to be conservative, the test conditions are single, and the mechanical property of the road structure is estimated to have deviation. A large number of research results show that the pavement structure under the comprehensive action of the compression shear load is easier to damage, the actual stress situation of the pavement structure is more met, when the horizontal force coefficient=0.5 (namely horizontal load/vertical load=0.5), the pavement structure is the most unfavorable state of the composite structure, and the inclination angle alpha=arctan 0.5=26 degrees 34' is known through mechanical calculation. Therefore, the invention considers the bidirectional load state under the least adverse condition, and the load state is more scientific.
According to the pressure head provided by the invention, a small-size pressure head (with the diameter of 26 mm) is adopted for loading according to the finite element calculation result. How to set the confining pressure is quite a controversial point in the indoor test in the field, and the real confining pressure state of the asphalt pavement cannot be determined, so that the value of the confining pressure is difficult to agree. The invention reduces the loaded area of the composite test piece through the small-size pressure head, so that the external structure of the composite test piece can provide real confining pressure constraint for the loaded area like an actual road surface; on the other hand, considering the size effect, the diameter of the pressure head is at least 2 times of the maximum nominal particle size of the aggregate of the test piece, so that the pressure head with the diameter of 26mm is used for loading, and the confining pressure constraint is more scientific.
The composite test piece provided by the invention can be obtained through indoor molding or road surface on-site core drilling sampling and the like, and has lower test requirements;
the spherical support provided by the invention allows the pressure head to rotate within +/-5 degrees, so that test errors caused by the unevenness of the end part of the composite test piece can be effectively eliminated, and the test result variation coefficient is 5% -8% smaller than that of the spherical support after test comparison test;
the test system provided by the invention has the advantages of simple operation, scientific method and stable result, and is convenient to popularize and use in scientific research and practical engineering application.
Drawings
FIG. 1 is a schematic diagram of a testing apparatus according to the present invention;
FIG. 2 is a schematic view of a loading station and a composite test piece;
FIG. 3 is a graph of structural compressive shear load versus time measured in example 1 of the present invention;
FIG. 4 is a graph showing the deformation of the structure under pressure versus the number of times measured in example 1 of the present invention;
reference numerals illustrate: 1. a spherical support; 2. a pressure head; 3. compounding a test piece surface layer; 4. compounding a test piece base layer; 5. a clasp; 6. a base; 7. an environmental box; 8. MTS material tester; 9. and a control system.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Examples
The self-made double-layer rut board test mold is exemplified by a semi-rigid base layer flexible surface layer composite pavement structure test piece formed indoors, other composite structure test pieces and the like. The method comprises the following specific steps:
(1) And (3) preparing a composite test piece base layer, pouring a semi-rigid inorganic bonding stable material in a lower rut board test mold, vibrating and compacting, placing for 45 minutes, then carrying out grooving and napping treatment on the upper surface of the composite test piece, placing the composite test piece into a standard curing room for curing for 7 days, and taking out from the curing room after the unconfined compressive strength of the composite test piece meets the standard requirement.
(2) The adhesive layer is manufactured to ensure the drying and cleaning of the surface of the semi-rigid base layer, and the surface of the semi-rigid base layer is 1.4kg/m 3 Uniformly spreading SBS modified asphalt, and immediately continuing uniformly spreading and pressing coarse aggregate of 13.2-19mm on the surface of asphalt, so that the coarse aggregate is fully wrapped with the binding asphalt.
(3) And (3) manufacturing a surface layer of the composite test piece, adding a layer of test die on a lower layer of rutting test die after the bonding layer is cooled to room temperature, adding the stirred hot-mix asphalt mixture, inserting and tamping according to the standard requirement, and then putting into wheel grinding forming equipment for wheel grinding compaction.
(4) And (3) manufacturing a composite test piece, taking out a core sample from the composite track plate by adopting a core drill sampler after the molded composite track plate is cooled to room temperature, and grinding the end part of the core sample by adopting a grinder to obtain the required composite test piece. And (3) performing density test on the composite test piece, and ensuring the molding quality of the composite test piece.
(5) Test piece preparation was completed as shown in fig. 2.
(6) And (3) carrying out temperature and humidity control on the composite test piece, and placing the molded composite test piece into an MTS environment box 7 for carrying out temperature and humidity environment control for 4-8 hours.
(7) And carrying out a structural compressive shear strength test, as shown in fig. 1 and 2, carrying out end treatment on the composite test piece, keeping the upper and lower surfaces of the composite test piece surface layer 3 and the composite test piece base layer 4 smooth and even, placing the composite test piece surface layer and the composite test piece base layer in a clamping ring 5 of a loading table 6 for fixing, adjusting a spherical support 1 to enable the contact surface of a pressure head 2 to be parallel to the composite test piece, and controlling an MTS material testing machine 8 to load the composite test piece through a control system 9. When the applied load has a peak value, the composite structure is considered to reach the limit of the deformation resistance, the peak value of the load is the compression shear damage load of the test piece, and the structural compression shear strength of the test piece can be calculated according to the following formula:wherein F is max For loading load peak value, r is the contact radius of the pressure head and the test piece;
as shown in fig. 3, the load change curve with time in the test process of this embodiment shows that the extreme value of the compression shear load of the embodiment is 1.615KN, and the extreme value is substituted into the calculation formula:the structural compressive shear strength of this example was found to be 2.72MPa. Repeating the steps, carrying out parallel test for 5 times, removing singular values, and taking an average value to obtain the structural compressive shear strength of the composite test piece of the embodiment, wherein the structural compressive shear strength is shown in table 1.
Table 1 compressive shear strength of composite test piece structure
(8) The structure compression shear fatigue test is that, as shown in fig. 1 and 2, the end of a composite test piece is processed, the upper and lower surfaces of a composite test piece surface layer 3 and a composite test piece base layer 4 are kept smooth and flat, the composite test piece surface layer is placed in a clamping ring 5 of a loading table 6 for internal fixation, a spherical support 1 is adjusted to enable the contact surface of a pressure head 2 to be parallel to the composite test piece, the pressure head 2 and the composite test piece surface layer 4 are in a critical state to be in contact, an MTS material testing machine 8 is controlled by a control system 9 to carry out intermittent half-sine cyclic wave loading on the composite test piece, the loading frequency is 10Hz, the intermittent time is 0.9s, the loading size is 0.2-0.8 times of a certain fixed value in the damage load, and the load cycle number when the test piece is damaged is the structure compression shear fatigue life of the composite test piece under the stress level.
As shown in fig. 4, the number of times the composite test piece of the present example was subjected to a maximum breaking load of 0.5 times, and the fatigue life was 10013 times. Repeating the steps, carrying out parallel test for 5 times, removing singular values, and taking the average value to obtain the structural fatigue life of the composite test piece of the embodiment, wherein the structural fatigue life is shown in Table 2.
Table 2 press shear fatigue life of composite test piece structure
Note that: stress ratio = load applied by structural compression shear fatigue test/compression shear limit load
Although a few embodiments of the present invention have been shown and described, it would be appreciated by those skilled in the art that changes, modifications, substitutions and alterations may be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (1)
1. A composite pavement structural strength and tired pressure shear testing arrangement, its characterized in that: the system comprises a loading system, a test system and a control system; the loading system is a hydraulic servo MTS tester; the test system sequentially comprises a spherical support, a pressure head, a composite test piece, a clamping ring, a base and an environment box from top to bottom, wherein the spherical support is used as a transfer device and is respectively and tightly meshed with the MTS tester and the pressure head through threads, the clamping ring is welded on the base, and the spherical support, the pressure head, the composite test piece, the clamping ring and the base are all arranged in the environment box; the control system is used for controlling the loading system to perform a pressure shear structural performance test on the composite test piece;
the diameter of the pressure head is 26mm, the loaded area of the composite test piece is reduced through the small-size pressure head, the external structure of the composite test piece can provide real confining pressure constraint for the loaded area like an actual road surface, the pressure head and the base form an included angle of 26 degrees 34' with the horizontal direction, and the spherical support allows the pressure head to rotate within +/-5 degrees;
the environment box controls the temperature and the humidity in the test process, the composite test piece is obtained through indoor molding or on-site core drilling, and the thicknesses of the base layer and the surface layer of the composite test piece are in different structure combination forms of 4+4cm, 4+5cm and 4+6cm according to the requirements;
the structural compressive shear strength and fatigue test respectively comprise the following steps:
(1) The structural compressive shear strength test step comprises the following steps: and (3) carrying out end treatment on the composite test piece, keeping the composite test piece smooth and flat, placing the composite test piece in a clamping ring of a loading table for internal fixation, adjusting a spherical support to enable a pressure head to be parallel to the upper surface of the composite test piece, loading the composite test piece by adopting a strain control mode, and when the applied load has a peak value, considering that the composite structure reaches the limit of the deformation resistance capacity, wherein the load peak value is the compression shear damage load of the test piece, and calculating the structural compression shear strength of the test piece according to the following formula:
wherein F is max For loading load peak value, r is the contact radius of the pressure head and the test piece;
(2) Structural compression shear fatigue test steps: the method comprises the steps of carrying out end treatment on a composite test piece, keeping the composite test piece smooth and flat, placing the composite test piece in a clamping ring of a loading table for internal fixation, adjusting a spherical support to enable a pressure head to be parallel to the upper surface of the composite test piece, enabling the pressure head to be in a critical state to be in contact with the composite test piece, applying intermittent half-sine cyclic load to the composite test piece through a loading system, wherein the loading frequency is 10Hz, the intermittent time is 0.9s, the load size is 0.2-0.8 time of a certain fixed value in the destructive load, and the number of load cycles when the test piece is destroyed is the structural compression shear fatigue life of the composite test piece under the stress level.
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| CN110411860B (en) * | 2019-07-04 | 2022-05-10 | 广州大学 | Interlaminar shear test device and method for asphalt pavement structure |
| CN110411873B (en) * | 2019-08-12 | 2022-02-08 | 长沙理工大学 | Method for optimizing rut test of rigid-flexible composite pavement |
| CN111624099B (en) * | 2020-04-16 | 2022-10-04 | 重庆大学 | Composite material laminated plate II type fatigue layering test device suitable for high and low temperature environment |
| CN113075037B (en) * | 2021-03-26 | 2022-06-07 | 武汉建工集团股份有限公司 | Intelligent road construction traffic load engineering detection test system and method |
| CN114323977B (en) * | 2021-12-28 | 2024-01-23 | 长安大学 | Damage continuous test system and test method for water-stabilized macadam base |
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