CN107238541B - accelerated loading device and method for indoor test of pavement materials - Google Patents
accelerated loading device and method for indoor test of pavement materials Download PDFInfo
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- CN107238541B CN107238541B CN201710319105.7A CN201710319105A CN107238541B CN 107238541 B CN107238541 B CN 107238541B CN 201710319105 A CN201710319105 A CN 201710319105A CN 107238541 B CN107238541 B CN 107238541B
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- 238000012360 testing method Methods 0.000 title claims abstract description 198
- 238000011068 loading method Methods 0.000 title claims abstract description 66
- 239000000463 material Substances 0.000 title claims abstract description 19
- 238000000034 method Methods 0.000 title claims abstract description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 108
- 238000010276 construction Methods 0.000 claims abstract description 21
- 230000001133 acceleration Effects 0.000 claims abstract description 18
- 238000007906 compression Methods 0.000 claims abstract description 9
- 239000011324 bead Substances 0.000 claims abstract description 5
- 230000005540 biological transmission Effects 0.000 claims abstract description 5
- 239000010426 asphalt Substances 0.000 claims description 12
- 230000008859 change Effects 0.000 claims description 12
- 230000008569 process Effects 0.000 claims description 12
- 239000000203 mixture Substances 0.000 claims description 9
- 238000012545 processing Methods 0.000 claims description 8
- 239000007921 spray Substances 0.000 claims description 8
- 229910000831 Steel Inorganic materials 0.000 claims description 7
- 239000007787 solid Substances 0.000 claims description 7
- 239000010959 steel Substances 0.000 claims description 7
- 238000005096 rolling process Methods 0.000 claims description 5
- 238000005299 abrasion Methods 0.000 claims description 4
- 238000006243 chemical reaction Methods 0.000 claims description 3
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- 230000009471 action Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
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- 239000011384 asphalt concrete Substances 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
- G01N3/56—Investigating resistance to wear or abrasion
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/22—Measuring arrangements characterised by the use of optical techniques for measuring depth
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H17/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves, not provided for in the preceding groups
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N19/00—Investigating materials by mechanical methods
- G01N19/02—Measuring coefficient of friction between materials
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
- G01N3/06—Special adaptations of indicating or recording means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
- G01N3/06—Special adaptations of indicating or recording means
- G01N3/068—Special adaptations of indicating or recording means with optical indicating or recording means
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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
- G01N3/56—Investigating resistance to wear or abrasion
- G01N3/567—Investigating resistance to wear or abrasion by submitting the specimen to the action of a fluid or of a fluidised material, e.g. cavitation, jet abrasion
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N5/00—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid
- G01N5/04—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid by removing a component, e.g. by evaporation, and weighing the remainder
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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
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/022—Environment of the test
- G01N2203/0222—Temperature
- G01N2203/0226—High temperature; Heating means
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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
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/022—Environment of the test
- G01N2203/0222—Temperature
- G01N2203/0228—Low temperature; Cooling means
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- 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
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/026—Specifications of the specimen
- G01N2203/0262—Shape of the specimen
- G01N2203/0266—Cylindrical specimens
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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
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/0641—Indicating or recording means; Sensing means using optical, X-ray, ultraviolet, infrared or similar detectors
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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
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0682—Spatial dimension, e.g. length, area, angle
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Abstract
The invention discloses an accelerated loading device for indoor tests of pavement materials, which comprises a thermostat, an operation table, tires, a motor, a transmission belt, a tachometer, a water pump, a water tank, a sprinkler bead, a temperature sensor, a circulating air inlet, a circulating air outlet, a noise detector, a hydraulic device, a test piece fastening module, a tension-compression type sensor, a self-lifting type testing wheel, a supporting wheel, a laser construction instrument and a computer, wherein the thermostat is positioned on the left side of a test device, the operation table is positioned on the right lower side of the outer wall of the test device, and the tires are positioned on the upper side of the thermostat; the operation panel comprises a main switch, an emergency stop key, an acceleration operation panel, a loading operation panel, a temperature control operation panel, a noise display, a water pump switch, a water pump operation knob and a motor switch. The method is simple and applicable, is reliable in operation, and can accurately simulate and detect the noise conditions, the anti-skid performance and the mass loss rate of the test piece of different pavement materials under different temperature environments, different wet and slippery degrees and different loading effects.
Description
Technical Field
The invention relates to an accelerated loading device and method for indoor tests of pavement materials, and belongs to the field of material tests.
Background
generally speaking, after an asphalt concrete pavement is built into a traffic, under the action of accelerated loading of traffic load, the road surface function has a tendency of gradual attenuation, the aggregate surface of the pavement is gradually worn away, the polishing value is reduced, the pavement structure depth is continuously reduced, and the skid resistance is reduced; during the contact process of the tire of the running vehicle and the road surface, air is continuously compressed and released, so that the running noise is generated, the running comfort is influenced, and the noise sound intensity is also continuously changed due to the gradual change of the road surface structure under the traffic operation; the loss of fine aggregates on the pavement is caused by the loading, abrasion, impact and vibration effects of wheels on the pavement, the pavement can be damaged by diseases such as looseness, pitted surfaces and the like, particularly in rainy seasons, the pavement is damaged by water due to the fact that the pavement is pressurized by flowing water, the pavement structure is damaged, and the service life of the pavement is shortened.
The existing acceleration loading device mostly adopts a solid steel wheel or a rubber wheel to carry out a reciprocating loading test on a track plate test piece, the reciprocating loading does not conform to the variation track of the asphalt mixture aggregate with the road surface straight-running driving state, and researches show that different loading modes have different influences on the arrangement rule of the asphalt mixture aggregate after wheel rolling. The test wheels of the existing indoor acceleration loading device are mostly in a dragging type, can not be driven to roll independently, can only apply vertical force to a test piece, can not apply horizontal force, is not consistent with the stress condition of an actual asphalt pavement, can not truly simulate the road running load, and can not accurately evaluate the functional indexes of the pavement. In addition, the general existing accelerated loading device mainly performs a driving test on an asphalt mixture test piece under different loading environments and different loading times, the anti-skid performance attenuation condition of the test piece cannot be monitored simultaneously in the test process, mostly, after the loading is stopped, a pendulum instrument and a manual sand laying method are adopted to measure the friction coefficient and the construction depth of the test piece, the two anti-skid index subjective factors have large influence, the test variability is large, the representativeness of the test result is low, and the efficiency is low. When the road surface anti-skid index is measured, the transverse force coefficient is accurate, and the road surface anti-skid performance is mostly checked by adopting the transverse force coefficient when the current high-grade highway is finished and accepted, but the transverse force coefficient is high in test cost and complex in test conditions and modes, so that the transverse force coefficient is applied to the road surface material acceleration loading device to measure the anti-skid performance of the test piece rarely.
Disclosure of Invention
the invention aims to provide an accelerated loading method and an accelerated loading device for indoor tests of pavement materials, which are simple, applicable, reliable in operation and capable of accurately simulating noise conditions, pavement skid resistance, structural stability and water stability under the action of different temperature environments, different wet skid degrees and different loading times according to the requirements of accelerated loading tests of the pavement materials and the defects and shortcomings of the prior art.
The purpose of the invention can be realized by the following technology:
An accelerated loading device for indoor tests of pavement materials comprises a constant temperature box, an operating platform, tires, a motor, a driving belt, a tachometer, a water pump, a water tank, a water spray head, a temperature sensor, a circulating air inlet, a circulating air outlet, a noise detection instrument, a hydraulic device, a test piece fastening module, a tension-compression type sensor, a self-lifting type testing wheel, a supporting wheel, a laser construction instrument and a computer, wherein the constant temperature box is positioned on the left side of the testing device, the operating platform is positioned on the right lower side of the outer wall of the testing device, the tires are positioned on the upper side of the constant temperature box and fixed on a rotating bearing and are connected with the motor through the driving belt, the motor is positioned on the right upper side of the testing device, the tachometer is positioned on one side of the tires, the bottom of the tires and the contact surface of the test piece are provided with the pressure sensor, the hydraulic device is connected with the bearing of the test piece fastening module, the bearing of the test piece fastening module is arranged in the transverse slideway or the longitudinal slideway, the water tank can slide up and down, left and right, the water pump is arranged under the test piece fastening module, the water pump is close to the left side of the water tank, a plurality of water spray heads which are connected with the water tank and spray water circularly are arranged above the test piece fastening module, the circulating air inlet is arranged at the top of the constant temperature box, the circulating air outlet is arranged at the right lower wall of the constant temperature box, the temperature sensor is arranged at the left and right walls at the lower side of the constant temperature box, the supporting wheel and the detachable self-lifting testing wheel are arranged at the bottom of the test piece fastening module, the contact surface of the bottom of the test piece fastening module and the self-lifting testing wheel is provided with a pull-press type sensor, the laser structure instrument is positioned at the left side of the test piece, the computer is positioned outside the test device and used for displaying noise sound intensity, transverse force coefficient and construction depth data;
The operation table comprises a main switch, an emergency stop key, an acceleration operation table, a loading operation table, a temperature control operation table, a noise display, a water pump switch, a water pump operation knob and a motor switch, and the temperature control operation table is connected with a circuit of the constant temperature box through a temperature controller and a temperature sensor; the acceleration operating platform is connected with the motor and the tachometer circuit; the loading operation table is connected with the hydraulic device and the pull-press type sensor circuit; the noise display is connected with the noise detector and the computer circuit; the water pump operation knob and the water pump switch are connected with a water pump circuit, and the motor switch is connected with the motor in a control mode.
furthermore, the tire is a pneumatic tire, and the motor is controlled by frequency conversion.
furthermore, a main shaft of the test piece fastening module is connected with the hydraulic device, the main shaft of the test piece fastening module is arranged in a transverse slide way or a longitudinal slide way, can slide up and down, left and right and is used for disassembling and fixing a test piece and lifting and loading the test piece, the main shaft of the test piece fastening module is connected with the slide way through a steel rolling bearing, and the central line of the main shaft of the test piece fastening module is parallel to the horizontal plane.
Furthermore, the self-lifting type test wheel is a solid rubber wheel and forms an angle with the rotation direction of the test piece, and the two support wheels are solid steel wheels capable of freely rotating and are used for supporting the test piece which can be deformed in the loading process.
Furthermore, temperature sensor, control by temperature change operation panel, thermostat, circulation air intake, circulation air outlet, thermostated container constitute temperature control system, temperature sensor for with the temperature signal that detects show to the control by temperature change operation panel on, the thermostat is used for controlling the temperature and the amount of wind of circulation air intake, adjusts the temperature of thermostated container.
Furthermore, the noise detector comprises a noise detector head, a filter and an A/D converter, wherein the noise detector head is symmetrically fixed on the inner walls of the constant temperature boxes on the left side and the right side of the tire, and the noise detector is used for processing the friction noise generated between the tire and the test piece through the filter, converting the friction noise through the A/D converter, transmitting the friction noise to the computer for processing, and finally displaying the friction noise on the noise display.
Furthermore, the water pump, the sprinkler bead and the water tank form a circulating water bath device through a thin water pipe, the water pump pumps water from the water tank, the water flows out of the sprinkler bead through the thin water pipe to soak the test piece, and then the water flows back to the water tank to form a circulating water bath loop.
Further, the laser construction instrument is used for continuously detecting a certain loading track of the test piece when the test piece rotates, transmitting the acquired data to the computer for data processing, and then displaying the data on the computer display.
an accelerated loading method based on the device comprises the following steps:
(1) Fixing an asphalt mixture test piece in a test piece fastening module, starting a loading operation table, adjusting a hydraulic device, and slowly jacking a bearing of the test piece fastening module by a hydraulic cylinder until the test piece is in contact with the tire, so that the pressure between the tire and the test piece reaches 0 ~ 1.0.0 MPa;
(2) Adjusting the temperature of the constant temperature box 8 to be within the range of-30 ~ 80 ℃ through a temperature control operation table, starting a water pump operation knob, spraying water circularly to enable the test piece to be in a water bath state, adjusting the power of the water pump, controlling the thickness of a water film, manually lifting the self-lifting test wheel, adjusting the contact load of the self-lifting test wheel and the test piece to be 200kgf +/-1 kgf, and fixing the self-lifting test wheel when the self-lifting test wheel forms an angle with the rotation direction of the test piece;
(3) Starting an acceleration operating platform, starting a motor, and adjusting the rotating speed of the motor to enable the rotating speed of the tire to be within the range of 0 ~ 300 r/min;
(4) Starting a computer, measuring the transverse force coefficient SFC under different loading times and different temperature conditions through a transverse force coefficient testing module, and displaying the transverse force coefficient SFC on a display of the computer;
(5) starting a noise detector, and measuring the surface friction noise sound intensity between the tire and the test piece;
(6) Observing the crack generation and development and surface wear conditions of the test piece, and evaluating the abrasion resistance of the test piece according to the quality change of the test piece before and after testing;
(7) And under the condition that the water bath is closed, starting the laser construction instrument, and measuring the construction depth change of the test piece in the loading process so as to evaluate the attenuation condition of the anti-sliding performance of the test piece in the acceleration loading process.
further, in step 4, the lateral force coefficient SFC is obtained by the following steps:
(41) Measuring a transverse force f through a tension-compression type sensor, transmitting the transverse force f to a computer, and processing the transverse force f through a transverse force coefficient testing module;
(42) the lateral force coefficient test module calculates the lateral force coefficient SFC = lateral force f/vertical force N x 100.
compared with the prior art, the invention has the following advantages:
the testing method and the testing device test various indexes of the asphalt mixture test piece such as transverse force coefficient, construction depth, noise level, quality loss rate and the like by simulating the driving loading process of the asphalt pavement, and provide a better guiding function for the test research of the skid resistance, noise, structural stability and water stability of the pavement material.
The invention can simulate the long-term driving operation effect of the road surface in a short time, the simulation environment is closer to the practical situation, the applicability is strong, the structure is simple, the test piece is easy and convenient to manufacture, and the operability is strong.
And thirdly, the anti-sliding performance of the test piece is measured by adopting the transverse force coefficient testing system 23 and the laser construction instrument 30, compared with a pendulum instrument and a manual sanding method, the method has strong accuracy and objectivity, can accurately measure the transverse force coefficient and the construction depth of the test piece, and truly evaluates the anti-sliding performance of the test piece.
The temperature control system can control the constant temperature box to be 8-30 ~ 80 ℃, the temperature control range is large, the temperature change of northern cold regions and southern wet and hot regions can be simulated, the maximum pressure between the adopted pneumatic tire and the test piece can reach 1.0MPa, the tire 9 is driven to rotate by the motor 22, the hydraulic pressurization simulates the axle load of the vehicle, and the real operation condition of various traffic vehicles on the asphalt pavement can be effectively simulated.
drawings
Fig. 1 is a schematic structural diagram of an indoor novel acceleration adding device according to an embodiment of the present invention.
fig. 2 is a schematic structural view of an incubator according to an embodiment of the present invention.
Fig. 3 is a schematic structural diagram of a console according to an embodiment of the present invention.
In the figure: 1-temperature controller; 2-a hydraulic device; 3-a temperature sensor; 4-a specimen fastening module; 5-a temperature sensor; 6-a tachometer; 7-circulating air inlet; 8-a constant temperature box; 9-a tire; 10-a sprinkler head; 11-rolling bearings; 12-a water pump; 13-noise detector; 14-a water tank; 15-small hydraulic press; 16-a transverse chute; 17-a longitudinal slide; 18-a noise display; 19-an acceleration console; 20-a loading console; 21-a temperature control operation table; 22-a motor; 23-a computer; 24-a noise probe; 25-a pull-press sensor; 26-a support wheel; 27-a self-elevating test wheel; 28-circulating air outlet; 29-a pressure sensor; 30-laser construction machine; 31-main switch; 32-scram key; 33-water pump switch; 34-water pump operating knob; 35-motor switch.
Detailed Description
The embodiments of the present invention are described in detail above with reference to the accompanying drawings.
The size of the asphalt mixture test piece is 150mm in diameter and 150-200 mm in height.
As shown in figures 1 and 2, the accelerated loading device for indoor tests of pavement materials comprises an incubator 8, an operation platform, tires 9, a motor 22, a transmission belt, a tachometer 6, a water pump 12, a water tank 14, a water spray head 10, temperature sensors 3 and 5, a circulating air inlet 7, a circulating air outlet 28, a noise detector 13, a hydraulic device 2, a test piece fastening module 4, a tension and compression type sensor 25, a self-lifting type test wheel 27, a supporting wheel 26, a laser construction instrument 30 and a computer 23, wherein the incubator 8 is positioned on the left side of the test device, the operation platform is positioned on the right lower side of the outer wall of the test device, the tires 9 are 4.00-8 pneumatic tires, the rotating speed is 0-300 r/min, the operation platform is positioned on the upper side of the incubator 8, is fixed on a rotating bearing and connected with the motor 22 through the transmission belt, the motor 22 is controlled by frequency conversion and is positioned on the, the tachometer 6 is positioned at one side of the tire 9, a pressure sensor 29 is arranged at the bottom of the tire 9 and on a contact surface of a test piece, bearings of the hydraulic device 2 and the test piece fastening module 4 are positioned at the lower side of the incubator 8, the hydraulic device 2 is driven to lift by a miniature hydraulic machine 15, the hydraulic device 2 is connected with the bearings of the test piece fastening module 4, the bearings of the test piece fastening module 4 are arranged in a transverse slide way 16 or a longitudinal slide way 17 and can slide up and down and left and right, the water tank 14 is arranged under the test piece fastening module 4, the water pump 12 is close to the left side of the water tank 14, a plurality of water spray heads 10 which are connected with the water tank 14 for circulating water spray are arranged above the test piece fastening module 4, the circulating air inlet 7 is arranged at the top of the incubator 8, the circulating air outlet 28 is arranged at the lower right wall of the incubator 8, the temperature sensors 3 and 5 are positioned at the left and right walls, a tension-compression type sensor 25 is arranged on the contact surface of the bottom of the test piece fastening module 4 and the self-lifting type test wheel 27, the laser constructor 30 is positioned on the left side of the test piece and can move back and forth, and the computer 23 is positioned outside the test device and is used for displaying noise intensity, transverse force coefficient and construction depth data;
As shown in FIG. 3, the operation platform comprises a main switch 31, an emergency stop key 32, an acceleration operation platform 19, a loading operation platform 20, a temperature control operation platform 21, a noise display 18, a water pump switch 33, a water pump operation knob 34 and a motor switch 35, the main switch 31 and the emergency stop key 32 control the opening and closing of all electric facilities, the temperature control operation platform 21 is electrically connected with a thermostat 8 through a temperature controller 1 and temperature sensors 3 and 5, the temperature control operation platform 21, a temperature controller 1, a circulating air inlet 7, a circulating air outlet 28 and the thermostat 8 form a temperature control system, the temperature sensors 3 and 5 are used for displaying detected temperature signals on the temperature control operation platform 21, the thermostat 8 is used for controlling air temperature and air volume of the circulating air inlet 7 and adjusting the temperature of the thermostat 8, the thermostat 8 is in a temperature adjusting range of-30-80 ℃, the acceleration operation platform 19 is electrically connected with a motor 22 and a tachometer 6, the loading operation platform 20 is connected with a hydraulic device 2 and a pull-press type sensor 25 circuit, the loading operation platform 20 is connected with a water pump operation platform 20, the water pump operation platform 20 is connected with a water pump operation platform 14, the water pump operation platform 14 is connected with a water tank 14, the water pump operation platform 14 is used for displaying the noise signal, the noise signal of the water flow rate of the water flow of the water pump operation platform 14 is displayed, the water flow of the water tank 14, the water flow meter 14 is displayed, the water tank 14 is displayed, the water flow meter 14 is displayed, the water flow meter 14.
The main shaft of the test piece fastening module 4 is connected with the hydraulic device 2, the main shaft of the test piece fastening module 4 is arranged in a transverse slide way 16 or a longitudinal slide way 17, can slide up and down, left and right and is used for disassembling and fixing a test piece and lifting and loading the test piece, the loading pressure range is 0-1.0 MPa, the main shaft of the test piece fastening module 4 is connected with the slide way through a steel rolling bearing 11, and the central line of the main shaft of the test piece fastening module 4 is parallel to the horizontal plane.
The self-lifting test wheel 27 is a solid rubber wheel and forms an angle of 20 degrees with the rotation direction of the test piece, and the two support wheels 26 are solid steel wheels capable of freely rotating and used for supporting the test piece which can be deformed in the loading process.
The laser configuration instrument 30 is used for continuously detecting a certain loading track of the test piece when the test piece rotates, transmitting the acquired data to the computer 23 for data processing, and then displaying the data on the display of the computer 23.
An accelerated loading method based on the device comprises the following steps:
(1) Fixing an asphalt mixture test piece in a test piece fastening module 4, starting a loading operation table 20, adjusting a hydraulic device 2, and slowly jacking a bearing of the test piece fastening module 4 by a hydraulic cylinder until the test piece is in contact with a tire 9, so that the pressure between the tire 9 and the test piece reaches 0 ~ 1.0.0 MPa;
(2) Adjusting the temperature of the incubator 8 to be within the range of-30 ~ 80 ℃ through the temperature control operation table 21, starting the water pump operation knob 34, spraying water circularly to enable the test piece to be in a water bath state, adjusting the power of the water pump 12, controlling the thickness of the water film, manually lifting the self-lifting test wheel 27, adjusting the contact load of the self-lifting test wheel 27 and the test piece to be 200kgf +/-1 kgf, and fixing the self-lifting test wheel 27 when the self-lifting test wheel 27 and the rotation direction of the test piece form an angle of 20 degrees;
(3) Starting the acceleration operating platform 19, starting the motor 22, and adjusting the rotating speed of the motor 22 to enable the rotating speed of the tire 9 to be within the range of 0 ~ 300 r/min;
(4) Starting the computer 23, measuring the transverse force coefficients SFC under different loading times and different temperature conditions through a transverse force coefficient testing module, and displaying the transverse force coefficients SFC on a display of the computer 23;
(5) starting a noise detector 13, and measuring the surface friction noise sound intensity between the tire 9 and the test piece;
(6) observing the crack generation and development and surface wear conditions of the test piece, and evaluating the abrasion resistance of the test piece according to the quality change of the test piece before and after testing;
(7) and under the condition that the water bath is closed, the laser construction instrument 30 is started, and the construction depth change of the test piece in the loading process is measured so as to evaluate the attenuation condition of the anti-sliding performance of the test piece in the acceleration loading process.
specifically, in step 4, the lateral force coefficient SFC is obtained by the following steps:
(41) The transverse force f is measured by the tension-compression type sensor 25 and is transmitted to the computer 23 to be processed by a transverse force coefficient testing module;
(42) the lateral force coefficient test module calculates the lateral force coefficient SFC = lateral force f/vertical force N x 100.
while the present invention has been described with reference to the preferred embodiments, it is to be understood that the present invention is not limited to the above-described embodiments, and it will be apparent to those skilled in the art that various changes and modifications may be made without departing from the scope of the invention without departing from the structure thereof.
Claims (9)
1. An accelerated loading device for indoor test of pavement materials is characterized in that: comprises a constant temperature box (8), an operating platform, tires (9), a motor (22), a transmission belt, a tachometer (6), a water pump (12), a water tank (14), a water spray head (10), temperature sensors (3, 5), a circulating air inlet (7), a circulating air outlet (28), a noise detector (13), a hydraulic device (2), a test piece fastening module (4) for mounting a cylindrical asphalt mixture test piece, a tension-compression type sensor (25), a self-lifting type test wheel (27), a supporting wheel (26), a laser construction instrument (30) and a computer (23), wherein the constant temperature box (8) is positioned on the left side of the testing device, the operating platform is positioned on the right lower side of the outer wall of the testing device, the tires (9) are positioned on the upper side of the constant temperature box (8), fixed on a rotating bearing and connected with the motor (22) through the transmission belt, and the motor (, the device is characterized in that the tachometer (6) is located on one side of a tire (9), a pressure sensor (29) is arranged on the bottom of the tire (9) and a contact surface of a test piece, a bearing of the hydraulic device (2) and a test piece fastening module (4) is located on the lower side of the incubator (8), the hydraulic device (2) is driven to lift through a small hydraulic machine (15), the hydraulic device (2) is connected with the bearing of the test piece fastening module (4), the bearing of the test piece fastening module (4) is arranged in a transverse slide way (16) or a longitudinal slide way (17) and can slide up and down, the water tank (14) is arranged under the test piece fastening module (4), the water pump (12) is close to the left side of the water tank (14), a plurality of water spray heads (10) connected with the water tank (14) in a circulating mode are arranged above the test piece fastening module (4), and the circulating air inlet (7) is arranged, the circulating air outlet (28) is arranged on the lower right wall of the constant temperature box (8), the temperature sensors (3 and 5) are positioned on the left and right walls of the lower side of the constant temperature box (8), the supporting wheel (26) and the detachable self-lifting type testing wheel (27) are arranged at the bottom of the test piece fastening module (4), the contact surface between the bottom of the test piece fastening module (4) and the self-lifting type testing wheel (27) is provided with a tension-compression type sensor (25), the laser construction instrument (30) is positioned on the left side of the test piece and can move back and forth, and the computer (23) is positioned outside the testing device and used for displaying noise intensity, transverse force coefficient and construction depth data; the operating platform comprises a main switch (31), an emergency stop key (32), an acceleration operating platform (19), a loading operating platform (20), a temperature control operating platform (21), a noise display (18), a water pump switch (33), a water pump operating knob (34) and a motor switch (35), wherein the temperature control operating platform (21) is connected with a circuit of the constant temperature box (8) through a temperature controller (1) and temperature sensors (3 and 5); the acceleration operating platform (19) is connected with the motor (22) and the tachometer (6) through circuits; the loading operation table (20) is connected with the hydraulic device (2) and the pull-press type sensor (25) through circuits; the noise display (18) is connected with the noise detector (13) and the computer (23) through circuits; the water pump operation knob (34) and the water pump switch (33) are connected with a water pump (12) circuit, and the motor switch (35) is connected with the motor (22) in a control way; the main shaft of the test piece fastening module (4) is connected with the hydraulic device (2), the main shaft of the test piece fastening module (4) is arranged in a transverse slide way (16) or a longitudinal slide way (17) and can slide up and down, left and right and used for disassembling and fixing a test piece and lifting and loading the test piece, the main shaft of the test piece fastening module (4) is connected with the slide way through a steel rolling bearing (11), and the central line of the main shaft of the test piece fastening module (4) is parallel to the horizontal plane.
2. The accelerated loading apparatus for indoor testing of pavement materials according to claim 1, wherein: the tire (9) is an inflatable tire, and the motor (22) adopts frequency conversion control.
3. the accelerated loading apparatus for indoor testing of pavement materials according to claim 1, wherein: the self-lifting type test wheel (27) is a solid rubber wheel and forms an angle of 20 degrees with the rotation direction of a test piece, and the supporting wheel (26) is a solid steel wheel capable of freely rotating and is used for supporting the test piece which can be deformed in the loading process.
4. the accelerated loading apparatus for indoor testing of pavement materials according to claim 1, wherein: temperature sensor (3, 5), control by temperature change operation panel (21), thermostat (1), circulation air intake (7), circulation air outlet (28), thermostated container (8) constitute temperature control system, temperature sensor (3, 5) are used for showing the temperature signal who detects to control by temperature change operation panel (21), and thermostat (1) is used for controlling the wind temperature and the amount of wind of circulation air intake (7), adjusts the temperature of thermostated container (8).
5. the accelerated loading apparatus for indoor testing of pavement materials according to claim 1, wherein: the noise detector (13) comprises a noise detector head (24), a filter and an A/D converter, wherein the noise detector head (24) is symmetrically fixed on the inner wall of the constant temperature box (8) on the left side and the right side of the tire (9), and the noise detector (13) is used for processing the friction noise generated between the tire (9) and a test piece through the filter, converting the friction noise through the A/D converter and transmitting the friction noise to the computer (23) for processing, and finally displaying the friction noise on the noise display (18).
6. The accelerated loading apparatus for indoor testing of pavement materials according to claim 1, wherein: the water pump (12), the sprinkler bead (10) and the water tank (14) form a circulating water bath device through a thin water pipe, the water pump (12) pumps water from the water tank (14), the water flows out of the sprinkler bead (10) through the thin water pipe to soak a test piece, and then the water flows back to the water tank (14) to form a circulating water bath loop.
7. The accelerated loading apparatus for indoor testing of pavement materials according to claim 1, wherein: the laser construction instrument (30) is used for continuously detecting a certain loading track of the test piece when the test piece rotates, transmitting the acquired data to the computer (23) for data processing, and then displaying the data on the display of the computer (23).
8. an accelerated loading method based on the device of any one of claims 1 to 7, characterized by comprising the following steps:
(1) fixing a cylindrical asphalt mixture test piece in a test piece fastening module (4), starting a loading operation table (20), adjusting a hydraulic device (2), and slowly jacking a bearing of the test piece fastening module (4) by the hydraulic cylinder until the test piece is contacted with a tire (9), so that the pressure between the tire (9) and the test piece reaches 0 ~ 1.0.0 MPa;
(2) Adjusting the temperature of the incubator (8) to be within the range of-30 ~ 80 ℃ through the temperature control operation table (21), starting the water pump operation knob (34), circularly spraying water to enable the test piece to be in a water bath state, adjusting the power of the water pump (12), controlling the thickness of the water film, manually lifting the self-lifting test wheel (27), adjusting the contact load of the self-lifting test wheel (27) and the test piece to be 200kgf +/-1 kgf, and fixing the self-lifting test wheel (27) when the self-lifting test wheel (27) and the rotation direction of the test piece form an angle of 20 degrees;
(3) Starting an acceleration operating platform (19), starting a motor (22), and adjusting the rotating speed of the motor (22) to enable the rotating speed of the tire (9) to be within the range of 0 ~ 300 r/min;
(4) starting the computer (23), measuring the transverse force coefficient SFC under different loading times and different temperature conditions through a transverse force coefficient testing module, and displaying the transverse force coefficient SFC on a display of the computer (23);
(5) Starting a noise detector (13) to measure the surface friction noise sound intensity between the tire (9) and the test piece;
(6) Observing the crack generation and development and surface wear conditions of the test piece, and evaluating the abrasion resistance of the test piece according to the quality change of the test piece before and after testing;
(7) And (3) under the condition that the water bath is closed, starting the laser construction instrument (30), and measuring the construction depth change of the test piece in the loading process so as to evaluate the attenuation condition of the anti-sliding performance of the test piece in the acceleration loading process.
9. the accelerated loading method of claim 8, wherein: in the step (4), the transverse force coefficient SFC is obtained by the following steps:
(41) The transverse force f is measured by the tension-compression type sensor (25) and is transmitted to the computer (23) to be processed by the transverse force coefficient testing module;
(42) The lateral force coefficient test module calculates the lateral force coefficient SFC = lateral force f/vertical force N x 100.
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| CN109046491A (en) * | 2018-09-04 | 2018-12-21 | 山东交通学院 | A kind of rotary accelerating and loading test system of constant temperature |
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| CN109632551B (en) * | 2018-12-24 | 2022-03-11 | 长安大学 | Parallel test device and test method for abrasion performance |
| CN109632550B (en) * | 2018-12-24 | 2022-01-14 | 长安大学 | Abrasion performance contrast test device and test method |
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| CN111780996B (en) * | 2020-08-06 | 2022-03-01 | 重庆广播电视大学重庆工商职业学院 | Tire comprehensive wear performance test system |
| CN112577440B (en) * | 2021-01-20 | 2022-04-12 | 黑龙江东北林大工程检测有限公司 | Improved generation road surface structure degree of depth detection device |
| CN113092277B (en) * | 2021-03-19 | 2022-02-18 | 广东居安建筑工程检测有限公司 | Device and method for detecting high-temperature resistance of asphalt on asphalt pavement |
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