CN112881215A - Synchronous high-frequency mechanical loading test method for hydrodynamic pressure environment - Google Patents
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- 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
- G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces
- G01N3/36—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces generated by pneumatic or hydraulic means
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- 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
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
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- 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
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- G01N2203/0007—Low frequencies up to 100 Hz
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- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
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- G01N2203/0019—Compressive
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- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
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- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
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Abstract
The invention provides a synchronous high-frequency mechanical loading test method for a hydrodynamic pressure environment, and belongs to the technical field of road engineering material performance tests. The method adopts a control system to simultaneously drive two servo hydraulic actuators to load, a piston reciprocates along the vertical direction to form a dynamic water pressure environment, and a mechanical loading rod carries out synchronous mechanical loading on an asphalt mixture test piece. The system comprises a servo hydraulic power device, a hydrodynamic pressure environment generating device, a mechanical loading rod applying device, an asphalt mixture test piece mechanical testing device, an asphalt mixture test piece health preserving device and a water environment temperature control device. The invention considers the complex working condition of coupling of multiple factors such as water, temperature, hydrodynamic pressure, vehicle load and the like, and realizes the monitoring and evaluation of the whole performance evolution process of the material in the hydrodynamic pressure environment, thereby more truly simulating and quantitatively evaluating the specific influence of the hydrodynamic pressure environment caused by vehicle tires on the asphalt pavement.
Description
Technical Field
The invention relates to the technical field of road engineering material performance testing, in particular to a synchronous high-frequency mechanical loading test method for a hydrodynamic pressure environment.
Background
The service environment of the asphalt pavement is a complex natural environment which is completely exposed to coupling of multiple factors such as temperature, rainfall, vehicle load and the like. When a vehicle runs on an asphalt pavement with water accumulated on the surface, the asphalt film is caused to peel off from the aggregate surface due to a high-frequency positive-negative alternative dynamic water pressure environment generated by repeated extrusion and suction of tires, so that water damage is caused, the service quality of the asphalt pavement is reduced, and the service life is shortened. The typical asphalt pavement service environment is simulated by adopting a proper test device and a proper test method, and the water damage resistance of the material is further evaluated, which is an indispensable link in the design of the asphalt pavement material.
In the existing research aiming at the water damage of the asphalt mixture, a test piece is generally placed in a dynamic water pressure environment for curing, the deterioration of a material is accelerated, and the water damage resistance of the test piece is evaluated by comparing the material performance change difference before and after curing. The above conventional method mainly has two problems: (1) the traditional method is to compare the initial state of an asphalt mixture test piece with the final state after water damage, namely the performance comparison at two moments, and cannot evaluate the performance evolution rule of the material in the whole service period; (2) in the traditional method, an asphalt mixture test piece is singly placed in a dynamic water pressure environment for curing, and the mechanical load is not directly acted on the test piece, which is essentially different from the actual service working condition that an asphalt pavement directly bears the vehicle load. Therefore, in order to evaluate the service performance evolution process of the asphalt mixture material bearing the vehicle load in the water environment, it is necessary to bring the mechanical load into the water environment for synchronous loading. There are related researches to immerse a test piece in a static water environment for mechanical loading, but the hydrodynamic pressure effect simulated by the static immersion environment is very limited.
Therefore, in order to simulate the service environment of the hydrodynamic pressure generated by the vehicle tire acting on the asphalt pavement more truly and evaluate the whole-process performance evolution law of the asphalt mixture, it is necessary to develop a synchronous high-frequency mechanical loading test method which comprehensively considers the coupling of various environmental factors such as water, temperature and the hydrodynamic pressure.
Disclosure of Invention
The invention aims to solve the technical problem of providing a dynamic water pressure environment synchronous high-frequency mechanical loading test method, which can more truly simulate the dynamic water pressure environment generated by a vehicle tire acting on an asphalt pavement and simultaneously evaluate the whole process performance evolution rule of an asphalt mixture material.
The method comprises the following steps:
s1: adhering the clamping fixture to the surface of a cylindrical asphalt mixture test piece by using epoxy resin, and mounting a strain sensor; placing the asphalt mixture test piece between a mechanical loading support and a mechanical loading pressure head, and then connecting and fixing a clamping fixture and a fixing fixture through a screw rod; meanwhile, another asphalt mixture test piece is placed on a support frame, and dynamic water pressure environment maintenance is carried out to be used as a control group; adjusting a mechanical loading rod to be in contact with a mechanical loading pressure head, and applying and maintaining a certain load for pre-pressing;
s2: closing a water valve at a water outlet, respectively opening the water valve at a water injection port and an air valve at a piston, and continuously injecting water with preset test temperature into the test system through the water injection port, wherein air in the test system is gradually discharged at the air valve of the piston; when water overflows from the air valve at the piston, closing the air valve;
s3: the piston is driven to move up and down slowly by adjusting the No. 1 servo hydraulic actuator, then the piston is stopped at a balance position, the air valve is opened until water overflows, at the moment, air in the test system is exhausted, and the air valve and a water valve at a water injection port are closed in sequence;
s4: the regulation control and data acquisition system drives the 1# servo hydraulic actuator and the 2# servo hydraulic actuator to load simultaneously by controlling the servo hydraulic station; simulating to generate dynamic water pressure environments with different magnitudes by controlling the amplitude and the frequency of the reciprocating motion of the piston in the vertical direction; simulating traffic load application of different working conditions on the asphalt mixture test piece by controlling the magnitude and frequency of the load applied by the mechanical loading rod; the temperature sensor and the water pressure sensor respectively monitor the temperature and water pressure change conditions of the water environment in real time, and the strain sensor monitors the strain response condition of the asphalt mixture test piece in the mechanical loading process;
s5: monitoring the stress and strain response conditions of the synchronous mechanical loading of the asphalt mixture test piece in a dynamic water pressure environment in real time through a control and data acquisition system; and after the test is finished, opening a water valve at the water outlet, draining water, taking out the test piece, and simultaneously carrying out data analysis.
The diameter of the asphalt mixture test piece is 100mm, the height of the asphalt mixture test piece is 150mm, and the pre-pressing load applied to the asphalt mixture test piece through the mechanical loading rod is 50-200N.
The injection water temperature in S2 is 0-70 ℃.
In S3, the piston slowly reciprocates up and down with the parameters of frequency 0.2Hz, amplitude 15mm and duration 30S.
The parameter range of the up-and-down reciprocating motion of the piston in the S4 is that the frequency is 0Hz-25Hz, the amplitude is 0mm-50mm, and the hydrodynamic pressure range is-0.1 MPa-2 MPa; the parameter range of the repeated load applied by the mechanical loading rod is 0Hz-25Hz in frequency and 0-30kN in load.
The raw parameters for data analysis in S5 include: loading period or time, temperature, hydrodynamic pressure, stress and strain, etc.
The technical scheme of the invention has the following beneficial effects:
(1) the invention adopts a control and data acquisition system to simultaneously drive two servo hydraulic actuators to work, can realize synchronous mechanical loading on an asphalt mixture test piece while forming a running water pressure environment, really considers the complex working conditions of coupling of multiple factors such as water, temperature, running water pressure, vehicle load and the like, can realize high frequency with loading frequency at least reaching more than 10Hz in a direct action mode of the servo hydraulic actuators, and has the advantages of test simulation environment approximate to the actual working conditions and real and accurate test results.
(2) According to the invention, the mechanical loading is directly carried out on the asphalt mixture in the dynamic water pressure environment, and the evolution rule of the performance parameters of the material in the whole test process can be monitored in real time through the obtained stress and strain data, so that the limitation that the traditional method can only evaluate the performance state of the material before and after water is kept is broken.
(3) The support frame is arranged to preserve the asphalt mixture test piece, so that the asphalt mixture test piece can be used as a comparison group for loading the test piece mechanically on one hand, and can be used for other test purposes such as monitoring of the water pressure evolution characteristic inside the test piece on the other hand, and therefore the test system has richer functions.
(4) The mechanical testing device for the asphalt mixture test piece is in a modular design, and the device and the disassembly can be completed outside a testing system, so that the testing operation process is more convenient and faster.
Drawings
FIG. 1 is a schematic structural diagram of an experimental system involved in the dynamic water pressure environment synchronous high-frequency mechanical loading test method of the present invention;
FIG. 2 is a top view of a mechanical loading test system for an asphalt mixture test piece in an embodiment of the invention.
Wherein: 1-a servo hydraulic station; 2-control and data acquisition system; 3-1# servo hydraulic actuator; 4-2# servo hydraulic actuator; 5-a frame; 6-insulating layer; 7-water outlet; 8-water injection port; 9-a water valve; 10-a piston sleeve seat; 11-a seal gasket; 12-a nut; 13-a piston; 14-a bolt; 15-piston slide rail sleeve; 16-a gas valve; 17-sliding sleeve seat; 18-a sealing ring; 19-a mechanical loading rod; 20-a base; 21-a guide rail; 22-bituminous mixture test piece; 23-mechanical loading support; 24-a mechanical loading ram; 25-a clamping fixture; 26-a strain sensor; 27-fixing the clamp; 28-screw rod; 29-a fixing nut; 30-a support frame; 31-a heater; 32-a temperature sensor; 33-water pressure sensor.
Detailed Description
In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments.
The invention provides a synchronous high-frequency mechanical loading test method for a hydrodynamic pressure environment.
As shown in fig. 1, the system related to the method comprises a servo hydraulic power device, a hydrodynamic pressure environment generating device, a mechanical loading rod applying device, an asphalt mixture test piece mechanical testing device, an asphalt mixture test piece curing device and a water environment temperature control device, wherein the devices are connected with one another and fixed on a system frame 5 from top to bottom and from outside to inside; the servo hydraulic power device comprises a control and data acquisition system 2, a servo hydraulic station 1, a No. 1 servo hydraulic actuator 3 and a No. 2 servo hydraulic actuator 4, wherein the control and data acquisition system 2 realizes connection and control of the servo hydraulic station 1 through a cable, and the servo hydraulic station 1 is connected with the No. 1 servo hydraulic actuator 3 and the No. 2 servo hydraulic actuator 4 through an oil inlet guide pipe and an oil return guide pipe; the hydrodynamic pressure environment generating device is fixed on the upper portion of the left side of the system frame 5 through a sealing gasket 11 and a nut 12, the hydrodynamic pressure environment generating device comprises a piston 13, a piston slide rail sleeve 15 and a piston sleeve seat 10, the piston 13 is arranged in the piston slide rail sleeve 15, the piston slide rail sleeve 15 is installed on the piston sleeve seat 10, the bottom of the piston 13 is in a groove shape, an air valve 16 is arranged at the axis, and the No. 1 servo hydraulic actuator 3 is connected with the piston 13 through a bolt 14; the mechanical loading rod applying device is fixed on the upper portion of the right side of the system frame 5 through a sealing gasket 11 and a nut 12, the mechanical loading rod applying device comprises a mechanical loading rod 19, a sealing ring 18 and a sliding sleeve seat 17, the sealing ring 18 is arranged between the mechanical loading rod 19 and the sliding sleeve seat 17, and the mechanical loading rod 19 is connected with the # 2 servo hydraulic actuator 4 through a bolt 14; the mechanical testing device for the asphalt mixture test piece is connected with the bottom of the system frame 5 through a fixing nut 29, and comprises a base 20, a guide rail 21, a mechanical loading pressure head 24, a mechanical loading support 23, a fixing clamp 27, a clamping clamp 25, a strain sensor 26 and the asphalt mixture test piece 22, wherein the mechanical loading support 23 is fixed at the central position of the base 20 through a bolt, the asphalt mixture test piece 22 is placed between the mechanical loading pressure head 24 and the mechanical loading support 23, the clamping clamp 25 is adhered to the side wall of the asphalt mixture test piece 22 through epoxy resin, the mechanical loading rod 19 is directly contacted with the mechanical loading pressure head 24 and applies mechanical load to the asphalt mixture test piece 22, the strain response condition of the material is monitored through the strain sensor 26 fixed inside the clamping clamp 25, as shown in figure 2, the clamping clamp 25 is connected with the fixing clamp 27 through a screw 28, the fixing clamp 27 is clamped on the guide rail 21, and the guide rail 21 is fixed on the base 20 through a nut; the asphalt mixture test piece curing device is positioned at the bottom of the system frame 5, and directly bears the erosion curing of the dynamic water pressure environment by placing the asphalt mixture test piece 22 on the support frame 30; the water environment temperature control device comprises a heater 31 positioned inside the system frame 5, and a water injection port 8, a water outlet 7 and a water valve 9 which are positioned on two sides of the bottom of the system frame 5, wherein the water injection port 8 and the water blowing port 7 are respectively provided with the water valve 9.
Wherein, the frame 5 is externally provided with an insulating layer 6.
The control and data acquisition system 2 simultaneously and independently regulates and controls the No. 1 servo hydraulic actuator 3 and the No. 2 servo hydraulic actuator 4, and realizes synchronous or asynchronous driving of the piston 13 and the mechanical loading rod 19.
A temperature sensor 32 and a water pressure sensor 33 are fixed on the upper portion of the right side of the frame 5, and the temperature of the water environment inside the test system and the change condition of the pore water pressure are monitored respectively.
In the specific implementation process, the test steps are as follows:
(1) adhering the clamping fixture 25 to the surface of the cylindrical asphalt mixture test piece 22 by using epoxy resin, and mounting a strain sensor 26; placing the asphalt mixture test piece 22 between a mechanical loading support 23 and a mechanical loading pressure head 24, and then connecting and fixing a clamping fixture 25 and a fixing fixture 27 with each other through a screw 28; meanwhile, another asphalt mixture test piece 22 is placed on the support frame 30, and dynamic water pressure environment health preservation is carried out to be used as a control group; adjusting the mechanical loading rod 19 to be in contact with the mechanical loading pressure head 24, and applying and maintaining a certain load for pre-pressing;
(2) closing the water valve 9 at the water outlet 7, respectively opening the water valve 9 at the water injection port 8 and the air valve 16 at the piston 13, and continuously injecting water with preset test temperature into the test system through the water injection port 8, wherein air in the test system is gradually discharged at the air valve 16 of the piston 13; when water overflows from the air valve 16 at the piston 13, closing the air valve 16;
(3) the piston 13 is driven to slowly move up and down by adjusting the No. 1 servo hydraulic actuator 3, then the piston 13 is stopped at the balance position, the air valve 16 is opened until water overflows, at the moment, the air in the test system is exhausted, and the air valve 16 and the water valve 9 at the water injection port 8 are closed in sequence;
(4) the regulation control system 2 drives the 1# servo hydraulic actuator 3 and the 2# servo hydraulic actuator 4 to be loaded simultaneously by controlling the servo hydraulic station 1; by controlling the amplitude and frequency of the reciprocating motion of the piston 13 along the vertical direction, the dynamic water pressure environment with different magnitudes can be simulated; by controlling the magnitude and frequency of the load applied by the mechanical loading rod 19, the traffic load application of different working conditions on the asphalt mixture test piece 22 can be simulated; the temperature sensor 32 and the water pressure sensor 33 respectively monitor the temperature and water pressure change conditions of the water environment in real time, and the strain sensor 26 monitors the strain response condition of the asphalt mixture test piece 22 in the mechanical loading process;
(5) monitoring the stress and strain response conditions of the synchronous mechanical loading of the asphalt mixture test piece 22 in the dynamic water pressure environment in real time through the data acquisition system 2; after the test is finished, the water valve 9 at the water outlet 7 is opened, the test piece 22 can be taken out after water is drained, and meanwhile data analysis is carried out.
According to the mode, the invention can be better realized, the control system 2 is adopted to simultaneously drive the two servo hydraulic actuators 3 and 4 to load, the piston 13 reciprocates along the vertical direction to form a dynamic water pressure environment, the mechanical loading rod 19 carries out synchronous mechanical loading on the asphalt mixture test piece 22, the complex working conditions of coupling of multiple factors such as water, temperature, dynamic water pressure, vehicle load and the like are really considered, the monitoring and evaluation of the whole performance evolution process of the material in the dynamic water pressure environment are realized, and the specific influence of the dynamic water pressure environment caused by vehicle tires on the asphalt pavement is more truly simulated and quantitatively evaluated. The above embodiments are only preferred embodiments of the present invention, and are not intended to limit the scope of the present invention (for example, the larger stroke of the piston 13 can obtain a larger hydrodynamic pressure), and therefore, all the modifications of the specimen size and the cyclic mechanical load applying mode according to the present invention are covered by the scope of the present invention as claimed in the appended claims.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (5)
1. A dynamic water pressure environment synchronous high-frequency mechanical loading test method is characterized by comprising the following steps: the method comprises the following steps:
s1: adhering a clamping fixture (25) to the surface of the cylindrical asphalt mixture test piece (22) by using epoxy resin, and mounting a strain sensor (26); placing an asphalt mixture test piece (22) between a mechanical loading support (23) and a mechanical loading pressure head (24), and then connecting and fixing a clamping clamp (25) and a fixing clamp (27) through a screw rod (28); meanwhile, another asphalt mixture test piece (26) is placed on a support frame (30) for dynamic water pressure environment health preservation and used as a control group; adjusting a mechanical loading rod (19) to be in mutual contact with a mechanical loading pressure head (24), and applying and maintaining a certain load for pre-pressing;
s2: closing a water valve (9) at a water outlet (7), respectively opening the water valve (9) at a water injection port (8) and an air valve (16) at a piston (13), and continuously injecting water with preset test temperature into the test system through the water injection port (8), wherein air in the test system is gradually discharged at the air valve of the piston; when water overflows from the air valve at the piston, the air valve (16) is closed;
s3: the piston (13) is driven to move up and down slowly by adjusting the No. 1 servo hydraulic actuator (3), then the piston is stopped at a balance position, the air valve (16) is opened until water overflows, at the moment, air in the test system is exhausted, and the air valve (16) and the water valve (9) at the water filling port are closed in sequence;
s4: the adjusting control and data acquisition system (2) drives the No. 1 servo hydraulic actuator (3) and the No. 2 servo hydraulic actuator (4) to load simultaneously by controlling the servo hydraulic station (1); the amplitude and the frequency of the reciprocating motion of the piston (13) along the vertical direction are controlled to simulate and generate dynamic water pressure environments with different magnitudes; the magnitude and the frequency of the load applied by the mechanical loading rod (19) are controlled to simulate the traffic load application of different working conditions on the asphalt mixture test piece (22); the temperature sensor (32) and the water pressure sensor (33) respectively monitor the temperature and water pressure change conditions of the water environment in real time, and the strain sensor (26) monitors the strain response condition of the asphalt mixture test piece (22) in the mechanical loading process;
s5: the stress and strain response conditions of the synchronous mechanical loading of the asphalt mixture test piece (22) in a hydrodynamic pressure environment are monitored in real time through the control and data acquisition system (2); and after the test is finished, opening a water valve (9) at the water outlet (7), taking out the test piece after water is drained completely, and simultaneously carrying out data analysis.
2. The dynamic water pressure environment synchronous high-frequency mechanical loading test method according to claim 1, characterized in that: the diameter of the asphalt mixture test piece (22) is 100mm, the height of the asphalt mixture test piece is 150mm, and the pre-pressing load applied to the asphalt mixture test piece (22) through the mechanical loading rod (19) is 50-200N.
3. The dynamic water pressure environment synchronous high-frequency mechanical loading test method according to claim 1, characterized in that: the injection water temperature in the S2 is 0-70 ℃.
4. The dynamic water pressure environment synchronous high-frequency mechanical loading test method according to claim 1, characterized in that: and in the S3, the parameters of the piston reciprocating up and down slowly are frequency 0.2Hz, amplitude 15mm and duration 30S.
5. The dynamic water pressure environment synchronous high-frequency mechanical loading test method according to claim 1, characterized in that: the parameter range of the up-and-down reciprocating motion of the piston in the S4 is that the frequency is 0Hz-25Hz, the amplitude is 0mm-50mm, and the hydrodynamic pressure range is-0.1 MPa-2 MPa; the parameter range of the repeated load applied by the mechanical loading rod is 0Hz-25Hz in frequency and 0-30kN in load.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116929878A (en) * | 2023-07-21 | 2023-10-24 | 燕山大学 | Multi-working-condition-simulating asphalt pavement coupling damage device |
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Application publication date: 20210601 |