Indoor anti-skid and wear-resistant test device for asphalt pavement

Abstract

The utility model discloses an asphalt pavement indoor skid resistance and wear resistance test device which comprises a constant temperature and humidity chamber and a console for regulating and controlling parameters in a test process, the constant temperature and humidity box comprises an upper box body and a lower box body which are communicated with each other, a temperature and humidity control device is mounted in the lower box body, an acceleration loading device is mounted in the upper box body, and the console is connected with the acceleration loading device. The device disclosed by the utility model can be used for simulating the damage to the skid resistance and wear resistance of the asphalt pavement in the driving process of a vehicle under the conditions of different loads, speeds, temperatures and humidity, testing the wear resistance of the asphalt pavement, and monitoring and storing the skid resistance of the pavement in real time. The equipment is simple to operate, short in test period and convenient to transport, test conditions are easy to control, and convenient conditions are provided for asphalt pavement skid resistance and wear resistance indoor tests.

Description

Technical Field

[0001] This utility model belongs to the field of road engineering technology, and specifically relates to an indoor anti-skid and wear-resistant testing device for asphalt pavement. Background Technology

[0002] The road traffic system consists of three main elements: people, vehicles, and roads. These three elements are closely interconnected and influence each other. Therefore, the anti-skid performance of a road surface is the result of a combination of factors, including road surface factors, vehicle operating parameters and tire performance, and environmental factors. Among these, road surface factors are crucial; insufficient anti-skid and wear-resistant performance of the road surface is a major cause of traffic accidents. Due to the high smoothness, low noise, convenient maintenance, and short construction period of asphalt pavements, more and more highways are using asphalt pavements. To ensure the safety of vehicles, asphalt pavements must have sufficient anti-skid and wear-resistant capabilities to ensure that vehicles can brake quickly during driving. In practical engineering applications, newly constructed asphalt pavements, after selecting high-quality aggregates and a well-graded anti-skid surface layer, generally meet the technical requirements for anti-skid indicators. However, as the service life of the pavement increases, asphalt pavements will age to some extent during operation, leading to a significant reduction in performance, decreasing the anti-skid and wear-resistant properties of the asphalt pavement, and seriously affecting driving safety and comfort. Especially under special climatic conditions, the anti-skid performance of asphalt pavements rapidly declines under the combined effects of traffic load, temperature, and humidity. Studies have found that the skid resistance of asphalt pavement is not only related to aggregate type, mineral content, and mineral gradation, but also affected by factors such as temperature and humidity, vehicle load, and driving speed.

[0003] Research on the skid resistance of asphalt pavements is now quite widespread. Various methods are used to assess the skid resistance of asphalt pavements, including the rotary trailer method, sand-laying method, drainage method, digital imaging method, energy loss method, pendulum method, braking distance method, laser measurement method, and lateral force coefficient detection. However, traditional testing equipment is difficult to use for short-term pavement testing, can interfere with traffic, and the accuracy of the data collected by the equipment significantly impacts the test results. Because asphalt pavement skid resistance testing is easily affected by external factors, indoor testing using different accelerated loading testers offers unique advantages. Furthermore, due to controllable variables and shorter testing times, compared to long-term field testing, it can play a crucial role in mix design and provides important guidance and reference value for road maintenance.

[0004] However, existing indoor abrasion testing devices, such as an accelerated loading test device for testing the abrasion performance of road materials (patent number: ZL201810026257.3), an indoor accelerated abrasion test device for asphalt pavement (patent number: ZL201721675452.9), an indoor accelerated abrasion device for asphalt mixtures (patent number: ZL202011079291.x), and an accelerated loading test instrument for asphalt mixtures (patent number: ZL200520078598.2), can only simulate the abrasion conditions of asphalt pavement and cannot monitor the anti-skid properties of the pavement in real time. Furthermore, they require a certain number of abrasion cycles before using traditional methods to test the anti-skid performance of the samples. This not only fails to address the insufficient accuracy of traditional testing methods but is also extremely cumbersome. Meanwhile, the abrasion resistance of asphalt pavement is a crucial factor in ensuring driving safety, yet few of the currently developed indoor abrasion testing devices consider this factor, limiting their reference value. Furthermore, during the wear and tear process of asphalt pavement, the amount of data required to accurately and realistically present the dynamic changes in the anti-skid and wear-resistant properties of the pavement surface is extremely large, ranging from hundreds to tens or even hundreds of thousands of data points, which is difficult to record manually. Therefore, to simulate the real service environment of asphalt pavement under the coupled effects of multiple factors, simplify the test procedure, shorten the test cycle, improve measurement accuracy, and comprehensively and systematically analyze the anti-skid and wear-resistant properties of asphalt pavement, providing convenience and technical support for the research on the long-term anti-skid and wear-resistant properties of asphalt pavement, this utility model designs an indoor anti-skid and wear-resistant testing device for asphalt pavement. Summary of the Invention

[0005] In order to overcome the technical problems of existing technologies, such as long testing cycles for the long-term anti-skid and wear resistance performance of asphalt pavement, which affect traffic, are cumbersome, and lack testing equipment for the anti-skid and wear resistance performance of asphalt pavement under the coupled effects of different factors, this utility model provides an indoor anti-skid and wear resistance testing device for asphalt pavement.

[0006] The above-mentioned objectives of this utility model are achieved through the following technical solution:

[0007] An indoor anti-skid and wear-resistant testing device for asphalt pavement includes a constant temperature and humidity chamber and a control console for adjusting the test process parameters; the constant temperature and humidity chamber includes an upper chamber and a lower chamber connected together, a temperature and humidity control device is installed in the lower chamber, an accelerated loading device is installed in the upper chamber, and the control console is connected to the accelerated loading device.

[0008] The accelerated loading device includes a base plate, a support column, and a lifting plate; the support column is fixedly connected to the base plate, and the lifting plate is movably connected to the support column, and the lifting plate can move up and down along the support column; the lifting plate includes an upper lifting plate and a lower lifting plate.

[0009] The accelerated loading device also includes a servo motor and a drive shaft. The drive shaft is connected to the upper lifting plate and the lower lifting plate through bearings. The drive pulley on one end of the drive shaft is connected to the servo motor through a drive belt, and the other end of the drive shaft is connected to the wheel fixing frame.

[0010] The accelerated loading device also includes wheels, which are connected to the two ends of the wheel fixing frame and are positioned opposite each other; a connecting rod is also connected between the two wheels.

[0011] The accelerated loading device also includes a sample testing platform, which is mounted on a base plate.

[0012] The accelerated loading device also includes a lifting cylinder, with the bottom plate and the lower lifting plate connected to its two ends respectively;

[0013] The accelerated loading device also includes a specimen indentation displacement sensor, a wheel angle adjuster, a pressure sensor, and a lateral force sensor; the specimen indentation displacement sensor is mounted on the wheel mounting bracket and located above the wheel; the wheel angle adjuster is located between the wheel mounting bracket and the connecting rod; the pressure sensor is located between the lifting cylinder and the lower lifting plate, and is connected to both the lifting cylinder and the lower lifting plate; the lateral force sensor is located between the wheel and the wheel mounting bracket, and is connected to both the wheel and the wheel mounting bracket.

[0014] The temperature and humidity control device includes an air conditioner and a humidifier.

[0015] Furthermore, a reinforcing connecting plate connects the upper lifting plate and the lower lifting plate.

[0016] Furthermore, the accelerated loading device also includes a top plate support plate, which is fixedly connected to the top of the support column.

[0017] Furthermore, sample fixing frames are provided around the sample testing platform, and the sample fixing frames are movably connected to the base plate.

[0018] Furthermore, the upper housing is provided with a door, and the door of the upper housing is also provided with a glass observation window.

[0019] Furthermore, the lower housing is equipped with an electrical control door, which is equipped with a temperature and humidity LCD display, a temperature control button, and a handle.

[0020] Furthermore, a steel plate support is installed at the bottom of the lower housing.

[0021] Furthermore, the console is equipped with a touch screen, operation buttons, and a power switch.

[0022] This utility model has the following beneficial effects:

[0023] (1) The loading motion mode of the wheel of the device of this utility model adopts a rotary type. The wheel angle can be accurately deflected from 0 to 20°. The wheel load, running speed and temperature and humidity can be controlled. It can accurately simulate the deterioration process of the anti-skid and wear resistance of asphalt pavement under the coupling effect of different factors. It can characterize the performance of asphalt pavement from the aspects of anti-skid and wear respectively, which is more scientific.

[0024] (2) The device of this utility model can collect data in real time, shortening the test cycle.

[0025] (3) The temperature and humidity control device installed in the device of this utility model can achieve precise temperature control and improve the simulation range of actual scenarios.

[0026] (4) The device of this utility model can reach a speed of 60km / h and a load of 1.2Mpa, which can simulate the road wear conditions of heavy traffic and high-speed traffic.

[0027] (5) The device of this utility model can place four identical test pieces at one time, and two different materials of tires can be replaced when testing road wear and friction coefficient. It can more accurately present the changes in the anti-skid performance and wear resistance of the road surface under external load. At the same time, the device can automatically collect friction coefficient and wear depth in real time with high efficiency and accurate results.

[0028] (6) The device of this utility model is highly practical. It can not only perform efficient wear treatment and accurate testing on pre-prepared specimens in an indoor environment, but also sample on the actual site in real time, so that the research is closely linked to the actual road conditions and the reliability of the research results is improved. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0030] Figure 2 This is a schematic diagram of the accelerated loading device structure;

[0031] Figure 3 This is a schematic diagram of the lower box structure.

[0032] Explanation of markings in the diagram: 1-Lower chamber, 2-Upper chamber, 3-Observation window, 4-Accelerated loading device, 5-Control console, 6-Touch screen, 7-Operation buttons, 8-Power switch, 9-Sample testing platform, 10-Lifting cylinder, 11-Support column, 12-Lateral force sensor, 13-Wheel angle adjuster, 14-Drive shaft, 15A-Upper lifting plate, 15B-Lower lifting plate, 16-Top support plate, 17-Drive belt, 18-Servo motor, 19-Reinforcing connecting plate, 20-Specimen indentation displacement sensor, 21-Pressure sensor, 22-Wheel fixing bracket, 23-Wheel, 24-Specimen fixing bracket, 25-Base plate, 26-Chamber door, 27-Temperature and humidity LCD display, 28-Handle, 29-Steel plate support, 30-Temperature control button, 31-Connecting rod. Detailed Implementation

[0033] The present invention will now be described in further detail.

[0034] like Figure 1-3 As shown, the present invention provides an indoor anti-skid and wear-resistant testing device for asphalt pavement, comprising a constant temperature and humidity chamber and a control console 5 for adjusting the test process parameters; the constant temperature and humidity chamber comprises an upper chamber 2 and a lower chamber 1 connected together, the lower chamber 1 is equipped with a temperature and humidity control device, the upper chamber 2 is equipped with an accelerated loading device 4, and the control console 5 is connected to the accelerated loading device 4.

[0035] The accelerated loading device 4 includes a base plate 25, a support column 11, and a lifting plate; the support column 11 is fixedly connected to the base plate 25, and the lifting plate is movably connected to the support column 11, and the lifting plate can move up and down along the support column 11; the lifting plate includes an upper lifting plate 15A and a lower lifting plate 15B.

[0036] The accelerated loading device 4 also includes a servo motor 18 and a drive shaft 14. The drive shaft 14 is connected to the upper lifting plate 15A and the lower lifting plate 15B via bearings. The servo motor 18 is mounted on the lower lifting plate 15B, and the drive shaft on the servo motor 18 is connected to the upper lifting plate 15A via bearings. A drive pulley at one end of the drive shaft 14 is connected to the servo motor 18 via a drive belt 17, and the other end of the drive shaft 14 is connected to the wheel fixing frame 22. The servo motor drives the drive shaft to rotate via the drive belt, and the drive shaft drives the wheel fixing frame to rotate, so that the wheel on the wheel fixing frame performs circular motion on the sample testing platform.

[0037] The accelerated loading device 4 also includes two wheels 23, which are arranged opposite to each other and connected to the two ends of the wheel fixing frame 22; a connecting rod 31 is also connected between the two wheels.

[0038] The accelerated loading device 4 also includes a sample testing platform 9, which is mounted on the base plate 25.

[0039] The accelerated loading device 4 also includes a lifting cylinder 10, with its two ends connected to a base plate 25 and a lower lifting plate 15B, respectively. The lifting cylinder drives the lifting plate to rise and fall, thereby achieving the lifting and loading of the wheels.

[0040] The accelerated loading device 4 also includes a specimen dent displacement sensor 20, a wheel angle adjuster 13, a pressure sensor 21, and a lateral force sensor 12. The specimen dent displacement sensor 20 is mounted on the wheel mounting bracket 22 and located above the wheel 23. The wheel angle adjuster 13 is located between the wheel mounting bracket 22 and the connecting rod 31 and is controlled by two tire inner screws and connecting rod screws. The pressure sensor 21 is located between the lifting cylinder 10 and the lower lifting plate 15B and is connected to the lifting cylinder and the lower lifting plate. The lateral force sensor 12 is located between the wheel 23 and the wheel mounting bracket 22 and is connected to the wheel and the wheel mounting bracket. One lateral force sensor is located on the right side of the left wheel, and the other lateral force sensor is located on the left side of the right wheel.

[0041] The temperature and humidity control device includes an air conditioner and a humidifier. The air conditioner controls the temperature inside the constant temperature and humidity chamber, and the humidifier controls the spray volume to adjust the humidity inside the chamber.

[0042] As a further optimization, a reinforcing connecting plate 19 is provided between the upper lifting plate 15A and the lower lifting plate 15B to further strengthen the upper and lower lifting plates.

[0043] As a further optimization, the accelerated loading device also includes a top plate support plate 16, which is fixedly connected to the top of the support column 11, and can further strengthen the overall structure of the device.

[0044] As a further optimization, sample fixing frames 24 are respectively provided around the sample testing platform 9, and the sample fixing frames 24 are movably connected to the base plate 25. When a sample is placed on the sample testing platform, the sample fixing frames flip upward to fix the sample on the sample testing platform.

[0045] As a further optimization, the upper chamber 2 is provided with a door, and the door of the upper chamber is also provided with a glass observation window 3, which facilitates the observation of the inside of the chamber during the test.

[0046] As a further optimization, the lower housing 1 is provided with an electrical box door 26, and the electrical box door 26 is provided with a temperature and humidity LCD display screen 27, a temperature control button 30 and a handle 28.

[0047] As a further optimization, a steel plate support 29 is installed at the bottom of the lower housing 1.

[0048] As a further optimization, the console 5 is equipped with a touch screen 6, operation buttons 7, and a power switch 8.

[0049] The working principle and process of the indoor skid resistance and abrasion resistance testing device for asphalt pavement of this utility model are as follows:

[0050] The accelerated loading device of this invention employs a rotary motion method. The wheels are driven by a lifting cylinder to achieve lifting and loading. The circular motion of the wheels on the sample platform is achieved by a servo motor, which drives the wheels to perform circular motion on the sample platform via a transmission belt and transmission shaft. The experimental process is as follows:

[0051] (1) Place the sample (300mm×300mm×50mm) on the sample testing platform 9, fix it with the sample fixing bracket 24, clean the surface contaminants with a brush, and close the box door on the upper box 2.

[0052] (2) Add a certain amount of water to the humidifier, turn on the air conditioner and humidifier, adjust the target temperature and humidity, and keep warm and moist for 1 hour when the target temperature and humidity reach the test requirements.

[0053] (3) Turn on the power switch 8 on the control panel, set the wheel pressure, running speed and number of rotations on the control panel 5, start the acceleration loading device 4, and collect wear test data in real time.

[0054] (4) After the tire has worn down to the specified number of revolutions, replace the worn tire (wear-resistant white nylon wheel) with a tire specifically designed for testing the coefficient of friction, adjust the tire angle, test the coefficient of friction, and collect the test data of the coefficient of friction in real time.

[0055] (5) After the test, remove the sample, turn off the power, and clean the residue inside the device.

Claims

1. An indoor anti-skid and abrasion resistance testing device for asphalt pavement, characterized in that: It includes a constant temperature and humidity chamber and a control console for adjusting the parameters of the test process; the constant temperature and humidity chamber includes an upper chamber and a lower chamber that are connected to each other, a temperature and humidity control device is installed in the lower chamber, an accelerated loading device is installed in the upper chamber, and the control console is connected to the accelerated loading device. The accelerated loading device includes a base plate, a support column, and a lifting plate; the support column is fixedly connected to the base plate, and the lifting plate is movably connected to the support column, and the lifting plate can move up and down along the support column; the lifting plate includes an upper lifting plate and a lower lifting plate. The accelerated loading device also includes a servo motor and a drive shaft. The drive shaft is connected to the upper lifting plate and the lower lifting plate through bearings. The drive pulley on one end of the drive shaft is connected to the servo motor through a drive belt, and the other end of the drive shaft is connected to the wheel fixing frame. The accelerated loading device also includes wheels, which are connected to the two ends of the wheel fixing frame and are positioned opposite each other; a connecting rod is also connected between the two wheels. The accelerated loading device also includes a sample testing platform, which is mounted on a base plate. The accelerated loading device also includes a lifting cylinder, with the bottom plate and the lower lifting plate connected to its two ends respectively; The accelerated loading device also includes a specimen indentation displacement sensor, a wheel angle adjuster, a pressure sensor, and a lateral force sensor; the specimen indentation displacement sensor is mounted on the wheel mounting bracket and located above the wheel; the wheel angle adjuster is located between the wheel mounting bracket and the connecting rod; the pressure sensor is located between the lifting cylinder and the lower lifting plate, and is connected to both the lifting cylinder and the lower lifting plate; the lateral force sensor is located between the wheel and the wheel mounting bracket, and is connected to both the wheel and the wheel mounting bracket. The temperature and humidity control device includes an air conditioner and a humidifier.

2. The indoor anti-skid and abrasion resistance testing device for asphalt pavement according to claim 1, characterized in that: A reinforcing connecting plate connects the upper lifting plate and the lower lifting plate.

3. The indoor anti-skid and abrasion resistance testing device for asphalt pavement according to claim 1, characterized in that: The accelerated loading device also includes a top plate support plate, which is fixedly connected to the top of the support column.

4. The indoor anti-skid and abrasion resistance testing device for asphalt pavement according to claim 1, characterized in that: The sample testing platform is equipped with sample fixing frames on all four sides, and the sample fixing frames are movably connected to the base plate.

5. The indoor anti-skid and abrasion resistance testing device for asphalt pavement according to claim 1, characterized in that: The upper box is equipped with a door, and the door of the upper box is also equipped with a glass observation window.

6. The indoor anti-skid and abrasion resistance testing device for asphalt pavement according to claim 1, characterized in that: The lower housing is equipped with an electrical control door, which features a temperature and humidity LCD display, a temperature control button, and a handle.

7. The indoor anti-skid and abrasion resistance testing device for asphalt pavement according to claim 1, characterized in that: The bottom of the lower housing is equipped with a steel plate support.

8. The indoor anti-skid and abrasion resistance testing device for asphalt pavement according to claim 1, characterized in that: The control panel is equipped with a touch screen, operation buttons, and a power switch.

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