Device for testing high-temperature performance of asphalt mixture

Abstract

The utility model discloses an asphalt mixture high-temperature performance testing device which comprises a detection machine table, a driving assembly is installed on the rear side of the detection machine table, lead screws are installed on the two sides of the upper side wall of the detection machine table, and a mounting frame is fixedly connected to the position, located on the outer sides of the lead screws, of the upper side wall of the detection machine table. A plurality of groups of heating lamps are erected on the mounting frame, an electromagnetic valve is mounted on the front side of the detection machine table, an asphalt placement groove is formed in the table top of the detection machine table, a plurality of air holes distributed in a rectangular array are formed in the asphalt placement groove, and the driving assembly comprises two belt pulleys, a driving motor and a driving belt. The asphalt performance testing device can simulate the real scene that vehicles with different loads roll asphalt, and can simulate the real scene that when the vehicles rapidly pass in low-temperature weather, tires rub against a road surface to generate high heat and hot air invades the asphalt in a construction environment, so that the performance test of the asphalt is more accurate.

Description

Technical Field

[0001] The utility model relates to the technical field of asphalt detection, in particular to a device for testing the high-temperature performance of asphalt mixture. Background Art

[0002] Asphalt wheel rolling testing primarily uses specialized testing equipment to simulate the effects of actual wheels on asphalt pavement. Asphalt samples are formed into plates of specified size and shape, placed on a test bench, and simulated wheels with a certain wheel load and tire pressure are rolled back and forth over the asphalt samples at a specified speed and frequency. This test directly reflects the asphalt pavement's ability to resist deformation under traffic loads, such as rutting resistance, which is related to pavement smoothness and driving comfort. From a durability perspective, it can also reveal the fatigue properties of asphalt under long-term wheel rolling and predict the pavement's service life. In terms of quality control, it is an effective means of verifying the rationality of asphalt mixture design and construction quality, ensuring the performance of the completed road, reducing subsequent maintenance costs, and ensuring safe and smooth road traffic.

[0003] However, this traditional asphalt wheel rolling test method has drawbacks. When a car passes quickly in cold weather, the friction between the tires and the road surface generates high heat, which this test method cannot simulate. Because asphalt itself becomes more brittle at low temperatures, the sudden high heat will cause the internal stress and strain state of the asphalt to become complex and changeable. This complex situation cannot be detected, which may lead to a misjudgment of the actual performance of the asphalt. At the same time, it cannot simulate the ingress of water vapor. Water vapor entering the asphalt pavement will affect the adhesion between the asphalt and the aggregate, weakening the structural strength of the pavement. The lack of water vapor in the test makes it impossible to accurately assess the asphalt pavement's ability to resist water damage in humid environments, and cannot reflect the actual performance of asphalt pavements in actual conditions such as after rain or in high humidity environments. This makes predictions about the pavement's service life and stability under such special conditions inaccurate, affecting the comprehensive and accurate assessment of asphalt quality. Utility Model Content

[0004] The purpose of the present utility model is to solve the shortcomings of the existing technology and to propose a high-temperature performance testing device for asphalt mixture. The designed high-temperature performance testing device for asphalt mixture can simulate the real scene of vehicles with different loads rolling over asphalt. At the same time, it can simulate the real scene of high heat generated by friction between tires and road surface when a car passes quickly in low temperature weather and hot air intrudes into the asphalt under the construction environment, making the performance test of asphalt more accurate.

[0005] To achieve the above objectives, the present invention provides the following technical solutions:

[0006] A high-temperature performance testing device for asphalt mixtures includes a testing machine, a drive assembly mounted on the rear side of the testing machine, screws mounted on both sides of the upper side wall of the testing machine, a mounting bracket fixedly connected to the upper side wall of the testing machine and located outside the screws, the mounting bracket being provided with several groups of heating lamps, a solenoid valve mounted on the front side of the testing machine, an asphalt placement groove being provided on the surface of the testing machine, and a plurality of air holes distributed in a rectangular array on the asphalt placement groove;

[0007] Through the above technical solution, the asphalt to be tested is placed in an asphalt placement tank, and then several groups of heating lamps are started to heat the surface of the asphalt by the heating lamps, thereby simulating the impact of high temperature weather on the asphalt surface. Hot steam is then added to the bottom of the asphalt placement tank through a solenoid valve, and then the hot air penetrates into the asphalt through several pores. By passing the hot air into the asphalt, the change in the performance of the asphalt caused by the high temperature environment during construction is simulated. At the same time, low-temperature gas can also be passed into the asphalt through the pores. At this time, under the joint action of the heating lamps and the low-temperature gas, the upper and lower surfaces of the asphalt show an obvious temperature difference, thereby simulating the impact of a vehicle passing by quickly in low temperature weather on the asphalt.

[0008] Furthermore, the driving assembly includes two pulleys, a driving motor and a driving belt, wherein the driving motor is mounted on the rear side wall of the detection machine, and the movable end of the driving motor is fixedly connected to one of the pulleys, and the driving belt is sleeved on the outer side walls of the two pulleys;

[0009] Through the above technical solution, one of the pulleys is driven by the driving motor and then the two pulleys are caused to rotate synchronously through the driving belt.

[0010] Furthermore, the two pulleys are connected to two screw rods respectively;

[0011] Through the above technical solution, the asphalt is rolled by sliding back and forth driven by the screw rod, so that the performance of the asphalt can be tested in a high temperature environment.

[0012] Furthermore, the upper side walls of the sliders of the two driving motors are fixedly connected with spring rods, the tops of the two spring rods are connected with spring tube racks through spring sleeves, and the middle position of the two spring tube racks is rotatably connected with a wheel;

[0013] Through the above technical solution, the slider drives the wheel to slide and roll on the asphalt surface. After the rolling is completed, the staff removes the asphalt and judges whether the asphalt meets the standards based on the surface condition of the asphalt.

[0014] Furthermore, a hydraulic cylinder is installed in the middle position of the mounting frame, the movable end of the hydraulic cylinder passes through the mounting frame and is connected to the connecting frame, and the bottom of the two side walls of the connecting frame are fixedly connected with a pressure plate, and the two pressure plates are respectively pressed against the upper side walls of the spring tube frame;

[0015] Through the above technical solution, the hydraulic cylinder drives the connecting frame to descend, which in turn drives the pressure plate to press it tightly against the spring tube frame, and then drives the wheels to press tightly against the asphalt surface, thereby simulating the situation of vehicles with different loads driving on the asphalt road surface.

[0016] The utility model has the following beneficial effects:

[0017] 1. In the present invention, the surface of the asphalt is heated by a heating lamp, thereby simulating the effect of high temperature weather on the asphalt surface. Hot steam is then added to the bottom of the asphalt placement tank through a solenoid valve. The hot gas then penetrates into the asphalt through a number of pores. By introducing the hot gas into the asphalt, the change in the performance of the asphalt caused by the high temperature environment during construction is simulated. At the same time, low-temperature gas can also be introduced into the asphalt through the pores. At this time, under the combined action of the heating lamp and the low-temperature gas, the upper and lower surfaces of the asphalt show an obvious temperature difference, thereby simulating the effect of a vehicle passing by quickly on the asphalt in low temperature weather.

[0018] 2. In the present invention, the slider drives the wheels to slide and roll on the asphalt surface. After the rolling is completed, the staff removes the asphalt and judges whether the asphalt meets the standards based on the surface condition of the asphalt. The hydraulic cylinder drives the connecting frame to descend and then drives the pressure plate to press it tightly on the spring tube frame, and then drives the wheels to press tightly on the asphalt surface, thereby simulating the situation of vehicles with different loads driving on the asphalt road surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is an overall diagram of an asphalt mixture high temperature performance testing device proposed by the utility model;

[0020] Figure 2 This is a schematic diagram of a high-temperature performance testing device for asphalt mixture proposed in the present invention after hidden mounting;

[0021] Figure 3 This is a top schematic diagram of an asphalt mixture high temperature performance testing device proposed in the utility model after hidden mounting.

[0022] Legend:

[0023] 1. Inspection machine; 2. Mounting frame; 3. Heating lamp; 4. Hydraulic cylinder; 5. Solenoid valve; 6. Drive assembly; 7. Connecting frame; 8. Pressure plate; 9. Spring tube rack; 10. Wheel; 11. Spring rod; 12. Asphalt placement tank; 13. Air hole; 14. Drive motor; 15. Screw; 16. Pulley; 17. Drive belt. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0025] Reference Figure 1-3 The utility model provides an embodiment of an asphalt mixture high temperature performance test device, including a testing machine 1, a driving assembly 6 is installed on the rear side of the testing machine 1, screw rods 15 are installed on both sides of the upper side wall of the testing machine 1, and a mounting frame 2 is fixedly connected to the upper side wall of the testing machine 1 and located on the outside of the screw rod 15. Several groups of heating lamps 3 are mounted on the mounting frame 2. A solenoid valve 5 is installed on the front side of the testing machine 1. An asphalt placement groove 12 is provided on the table of the testing machine 1. Several air holes 13 distributed in a rectangular array are provided on the asphalt placement groove 12. The asphalt to be tested is placed in the asphalt placement groove 12, and then the asphalt is started. Several groups of heating lamps 3 are used to heat the surface of the asphalt, thereby simulating the impact of high temperature weather on the asphalt surface. Hot steam is then added to the bottom of the asphalt placement tank 12 through the solenoid valve 5. The hot air then penetrates into the asphalt through several air holes 13. By passing the hot air into the asphalt, the change in the performance of the asphalt caused by the high temperature environment during construction is simulated. At the same time, low-temperature gas can also be passed into the asphalt through the air holes 13. At this time, under the combined action of the heating lamps 3 and the low-temperature gas, the upper and lower surfaces of the asphalt show an obvious temperature difference, thereby simulating the impact on the asphalt caused by a vehicle passing by quickly in low temperature weather.

[0026] The driving assembly 6 includes two pulleys 16, a driving motor 14 and a driving belt 17. The driving motor 14 is installed on the rear side wall of the testing machine 1, and the movable end of the driving motor 14 is fixedly connected to one of the pulleys 16. The driving belt 17 is sleeved on the outer side walls of the two pulleys 16. The driving motor 14 drives one of the pulleys 16 and then the driving belt 17 makes the two pulleys 16 rotate synchronously. The two pulleys 16 are respectively connected to two screw rods 15, which drive the wheel 10 to slide back and forth to crush the asphalt, thereby testing the performance of the asphalt under high temperature environment.

[0027] The upper side walls of the sliders of the two driving motors 14 are fixedly connected with spring rods 11, and the tops of the two spring rods 11 are connected with spring tube frames 9 through spring sleeves, and the wheels 10 are rotatably connected to the middle position of the two spring tube frames 9. The wheels 10 are driven by the sliders to slide and roll on the asphalt surface. After the rolling is completed, the staff removes the asphalt and judges whether the asphalt meets the standards based on the surface condition of the asphalt. A hydraulic cylinder 4 is installed in the middle position of the mounting frame 2. The movable end of the hydraulic cylinder 4 passes through the mounting frame 2 and is connected to the connecting frame 7. The bottom of the two side walls of the connecting frame 7 is fixedly connected with pressure plates 8. The two pressure plates 8 are respectively pressed tightly on the upper side walls of the spring tube frames 9. The connecting frame 7 is driven down by the hydraulic cylinder 4, and the pressure plates 8 are driven to press tightly on the spring tube frames 9, thereby driving the wheels 10 to press tightly on the asphalt surface, thereby simulating the situation of vehicles with different loads driving on the asphalt road surface.

[0028] Working principle: The asphalt to be tested is placed in the asphalt placement tank 12, and then several groups of heating lamps 3 are started to heat the surface of the asphalt through the heating lamps 3, thereby simulating the impact of high temperature weather on the asphalt surface. The driving motor 14 drives one of the pulleys 16 and then drives the two pulleys 16 to rotate synchronously through the driving belt 17. The screw rod 15 drives the wheel 10 to slide back and forth to roll the asphalt, thereby testing the performance of the asphalt under high temperature environment. The hydraulic cylinder 4 drives the connecting frame 7 to descend and then drives the pressure plate 8 to press it tightly on the spring tube frame 9, thereby driving the wheel 1 0 is pressed tightly on the asphalt surface, thereby simulating the situation of vehicles with different loads driving on the asphalt road surface. Hot steam is added to the bottom of the asphalt placement tank 12 through the solenoid valve 5, and then the hot air penetrates into the asphalt through a number of air holes 13. By passing the hot air into the asphalt, the change of the high temperature environment on the asphalt performance during construction is simulated. At the same time, low-temperature gas can also be passed into the asphalt through the air holes 13. At this time, under the combined action of the heating lamp 3 and the low-temperature gas, the upper and lower surfaces of the asphalt show an obvious temperature difference, thereby simulating the impact on the asphalt when a vehicle passes by quickly in low temperature weather.

[0029] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent replacements for some of the technical features therein. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A device for testing the high temperature performance of asphalt mixture, comprising a testing machine (1), characterized in that: A driving assembly (6) is installed on the rear side of the detection machine (1), screw rods (15) are installed on both sides of the upper side wall of the detection machine (1), a mounting frame (2) is fixedly connected to the upper side wall of the detection machine (1) and located outside the screw rod (15), and a plurality of groups of heating lamps (3) are mounted on the mounting frame (2), a solenoid valve (5) is installed on the front side of the detection machine (1), and an asphalt placement groove (12) is provided on the table of the detection machine (1), and a plurality of air holes (13) distributed in a rectangular array are provided on the asphalt placement groove (12).

2. The asphalt mixture high temperature performance testing device according to claim 1, characterized in that: The driving assembly (6) includes two pulleys (16), a driving motor (14) and a driving belt (17). The driving motor (14) is installed on the rear side wall of the detection machine (1), and the movable end of the driving motor (14) is fixedly connected to one of the pulleys (16). The driving belt (17) is sleeved on the outer side walls of the two pulleys (16).

3. The asphalt mixture high temperature performance testing device according to claim 2, characterized in that: The two pulleys (16) are connected to the two screw rods (15) respectively.

4. The asphalt mixture high temperature performance testing device according to claim 3, characterized in that: The upper side walls of the sliders of the two driving motors (14) are fixedly connected with spring rods (11), the tops of the two spring rods (11) are connected with spring tube racks (9) through spring sleeves, and the middle position of the two spring tube racks (9) is rotatably connected with a wheel (10).

5. The asphalt mixture high temperature performance testing device according to claim 4, characterized in that: A hydraulic cylinder (4) is installed in the middle of the mounting frame (2), and the movable end of the hydraulic cylinder (4) passes through the mounting frame (2) and is connected to a connecting frame (7). The bottoms of the two side walls of the connecting frame (7) are fixedly connected to pressure plates (8), and the two pressure plates (8) are respectively pressed against the upper side walls of the spring tube frame (9).

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