Impact test device for testing anti-freezing performance of asphalt pavement

Abstract

The utility model discloses an impact test device for testing the anti-freezing performance of an asphalt pavement. The impact test device comprises a scale rod, a base and an aluminum plate channel, the scale rod is provided with three sections of telescopic parts and is vertically fixed on the base; a round wheel is fixed on the inner side of the top end of the scale rod; the aluminum plate channel is fixedly connected with the cross rod; the cross rod is perpendicular to the scale rod and can rotate; a fixing piece is arranged on the side face of the aluminum plate channel. The fixing piece is formed by fixedly connecting a square attaching block and a clamp, and the aluminum plate channel can be fixed by connecting the clamp with the round wheel. According to the utility model, the vertical force and the horizontal force acting on the test piece are controlled by controlling the rolling height and angle of the steel ball, the strength of the anti-freezing performance of the asphalt pavement is evaluated according to the residual rate of the ice layer on the surface of the test piece, and the device has the advantages of simple structure, simplicity in operation, high flexibility, capability of accurately and objectively evaluating the anti-freezing performance of the test piece and the like. The popularization is facilitated.

Description

Technical Field

[0001] The utility model relates to the field of detection equipment used in road construction projects, in particular to an impact test device for testing the anti-icing performance of asphalt pavement. Background Art

[0002] Every year, more than half of my country's asphalt pavements are plagued by icing problems. Icing greatly reduces the friction coefficient of the road surface, making it difficult for tire adhesion to ensure safe braking of the car, which can easily lead to traffic accidents such as vehicle rollovers and rear-end collisions. Therefore, anti-icing performance is a very important indicator in the selection and design of asphalt pavement materials.

[0003] Currently, the anti-icing performance of asphalt pavements is often evaluated by measuring the bond strength between Marshall specimens and soaked polyester felt under low-temperature conditions, or by measuring the melting of ice and snow on the specimen surface after a snowfall. However, these methods are only suitable for testing the deicing effectiveness of salt-storage pavement materials and surface coatings. They cannot simulate the vehicle loads experienced by asphalt pavements under driving conditions and are unsuitable for testing the deicing effectiveness of elastic pavement materials.

[0004] Chinese patent publication number CN209656534U, published on March 19, 2019, discloses a device for testing the anti-icing performance of asphalt pavements by simulating dynamic loads. The device consists of a sliding rod, a balancing arm, a turntable, a striking section, and a rubber plate. By combining the striking and rotating motion mechanisms, it simulates the vertical forces acting on asphalt pavement under driving conditions. The anti-icing performance of the asphalt pavement is then determined based on the ratio of the ice-crushed area to the total area. However, this method ignores the effects of horizontal forces on the asphalt pavement and still cannot effectively simulate the vehicle loads acting on the asphalt pavement under driving conditions. Utility Model Content

[0005] In order to solve the above technical problems, the utility model proposes an impact test device for testing the anti-icing performance of asphalt pavement. By controlling the height and angle of the rolling ball, the dynamic load on the asphalt pavement under different traffic conditions is simulated, thereby comprehensively evaluating the anti-icing performance of the asphalt pavement.

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0007] An impact test device for testing the anti-icing performance of asphalt pavement includes a scale rod, a base, a cross bar, a round wheel, an aluminum plate channel, a fixing piece, a steel ball, a test specimen and a wooden board. The scale rod is fixedly connected to the base and is perpendicular to the base. The scale rod includes a non-retractable part and a retractable part. The cross bar and the scale rod are perpendicular to each other and the cross bar is rotatable. The round wheel is located at the end of the cross bar and is arranged on the inner side of the scale rod. The aluminum plate channel includes an aluminum plate and a baffle. The aluminum plate is fixedly connected to the cross bar. The baffle is fixed on both sides of the aluminum plate. The fixing piece is arranged on the outside of the baffle. The steel ball can slide on the aluminum plate channel and impact the test specimen covered with the wooden board.

[0008] Furthermore, the scale of the non-retractable part of the scale rod starts from 0mm, increases from bottom to top, and the maximum scale is 500~800mm; the retractable part of the scale rod has three sections, and the scale of each section starts from 0mm, increases from bottom to top, and the maximum scale is 100~200mm.

[0009] Furthermore, the circular wheel is fixed to the inner side of the top end of the scale rod, with a thickness of 10~20mm and a scale engraved on the inside. The scale starts from 0°, corresponding to the aluminum plate channel being in a horizontal position. As the aluminum plate channel rotates downward, the scale gradually increases, and the maximum scale is 90°, at which time the aluminum plate channel is in a vertical downward position.

[0010] Furthermore, the fixing piece is formed by a square patch and a clip fixedly connected, the square patch is fixedly attached to the baffle, and the fixing piece can be fixed to the round wheel through the clip.

[0011] Furthermore, the thickness of the ice layer on the surface of the test specimen is 5~10mm.

[0012] Furthermore, the test specimen has a length, width and height of 90-100 mm and is covered with a wooden board with the same cross-sectional dimensions and a thickness of 5-12 mm.

[0013] Furthermore, the base is an iron plate or a steel plate with a mass of 8 to 10 kg to ensure the balance of the test device.

[0014] Furthermore, the height and inclination of the aluminum plate channel are adjustable.

[0015] The utility model provides an impact test device for testing the anti-icing performance of asphalt pavement. Compared with the prior art, the utility model has the following advantages and beneficial effects:

[0016] The utility model can simulate the effect of the horizontal force of vehicle load on the asphalt pavement by the oblique impact of the steel ball on the test specimen; by controlling the height and angle of the aluminum plate channel and thus controlling the vertical force and horizontal force of the steel ball on the test specimen, the vehicle load acting on the asphalt pavement under different traffic conditions can be simulated; by repeating the test, a variation curve of the ice layer residual rate on the surface of the test specimen can be obtained, and the anti-icing performance of the asphalt pavement can be evaluated more comprehensively according to the variation of the curve; and the test device has a simple structure, is easy to implement, and is easy to operate, and is suitable for promotion. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the structure of the test device of the utility model;

[0018] Figure 2 This is a schematic structural diagram of the test specimen of the utility model.

[0019] Among them are:

[0020] 1. Scale rod; 2. Base; 3. Crossbar; 4. Round wheel; 5. Aluminum plate channel; 6. Fixing parts; 7. Steel ball; 8. Test specimen; 9. Wooden board; 11. Non-retractable part of scale rod; 12. Retractable part of scale rod; 51. Aluminum plate; 52. Baffle. DETAILED DESCRIPTION

[0021] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments:

[0022] like Figure 1 and Figure 2 As shown, the utility model discloses an impact test device for testing the anti-icing performance of asphalt pavement; the device includes a scale rod 1, a base 2, a cross bar 3, a round wheel 4, an aluminum plate channel 5, a fixing part 6, a steel ball 7, a test specimen 8 and a wooden board 9.

[0023] like Figure 1As shown, the scale rod 1 is vertically fixed to the middle of the base 2. The scale rod 1 includes a non-retractable part 11 and a retractable part 12. The scale of the non-retractable part 11 of the scale rod starts from 0 mm and increases from bottom to top, and the maximum scale is 500~800 mm; the retractable part 12 of the scale rod has three sections, each of which starts from 0 mm and increases from bottom to top, and the maximum scale is 100~200 mm. The height of the aluminum plate channel 5 can be adjusted by adjusting the height of the retractable part 12 of the scale rod. The base 2 is preferably a heavy iron or steel plate to ensure the balance of the test device; the circular wheel 4 is fixedly connected to the inner side of the top of the scale rod 1, with a thickness of 10~20mm and a scale engraved on the inside. The scale starts from 0°, corresponding to the aluminum plate channel 5 in the horizontal position, and the scale gradually increases as the aluminum plate channel 5 rotates downward. The maximum scale is 90°, corresponding to the aluminum plate channel 5 in the vertical downward position, and there is a small round hole in the middle for the cross bar 3 to pass through; the cross bar 3 is set perpendicular to the scale rod 1, and the cross bar 3 crosses The surface is circular, and the diameter of the circle is 2~4mm smaller than the diameter of the small circular hole in the middle of the round wheel 4, so that the cross bar 3 can rotate; the aluminum plate channel 5 includes an aluminum plate 51 and a baffle 52, the aluminum plate 51 is fixedly connected to the cross bar 3 so that the aluminum plate channel 5 can rotate with the cross bar, and the baffle 52 is arranged on both sides of the aluminum plate 51 to prevent the steel ball 7 from rolling out of the aluminum plate channel 5 from the side during the rolling process, and the length of the top of the baffle 52 should be 30~40mm smaller than the aluminum plate 51 to prevent the baffle 52 from blocking the scale of the round wheel 4; the fixing part 6 is assembled on the baffle The outer side of the plate 52 is made of square patches and clips fixedly connected, and the aluminum plate channel 5 can be connected and fixed to the round wheel 4 through the clip; the steel ball 7 can roll down the aluminum plate channel 5 and hit the test specimen 8 covered with the wooden board 9. By adjusting the scale rod 1 and the aluminum plate channel 5, the height and angle of the steel ball 7 when rolling can be adjusted to control the vertical and horizontal forces of the steel ball 7 on the test specimen 8 to simulate vehicle loads under different traffic conditions; in addition, all the above-mentioned fixed connection methods can be bolted, riveted or integrally formed.

[0024] like Figure 2 As shown, the test specimen 8 and the wooden board 9 are shown. The length, width and height of the test specimen 8 are 90~100mm, and the thickness of the ice layer on the surface is 5~10mm; the wooden board 9 covers the test specimen 8, and the cross-sectional size of the wooden board 9 is the same as that of the test specimen 8, and the thickness is 5~12mm. By completely covering the top surface of the test specimen 8, the wooden board 9 can evenly disperse the force generated by the impact of the steel ball 7 to the ice layer on the top of the test specimen 8, so as to simulate the situation where the vehicle load acts on the asphalt road surface through the wheels.

[0025] The test process of this utility model is:

[0026] The asphalt test specimen 8 after forming was weighed to obtain the mass of the test specimen 8 before ice coating. m v, then use foam sponge tape to seal the upper surface of the test specimen 8 to form a water storage enclosure. Pour an appropriate amount of clean water on the test specimen 8, then place it in a -10℃ refrigerator to freeze for 6 hours, so that a layer of ice with a thickness of 10mm is formed on the surface of the test specimen 8. Then remove the foam sponge enclosure and weigh the test specimen 8 to obtain the mass of the test specimen 8 after the surface is fully covered with ice. m o .

[0027] Place the test device on a solid, flat floor indoors, adjust the height of the scale rod 1 and the angle of the aluminum plate channel 5, then use the fixing part 6 to fix the aluminum plate channel 5, and then make the steel ball 7 roll down from the middle position of the top of the aluminum plate channel 5 without initial velocity and mark the initial rolling position of the steel ball 7. Mark the landing position of the steel ball 7 after landing. After letting the steel ball 7 roll down from the initial rolling position 5 to 10 times, use the circle drawing method (that is, circle each landing point with the smallest possible circle and use the center position of the circle to represent the average landing position) to determine the average landing position of the steel ball 7. Then, place the test specimen 8 according to the average landing position of the steel ball 7 so that the steel ball 7 can hit the center position of the top surface of the test specimen 8 during the falling process.

[0028] After the test specimen 8 is placed, a wooden board 9 is covered on the test specimen 8, and then the steel ball 7 is rolled down from the previously marked initial rolling position without initial velocity. After the steel ball 7 hits the test specimen 8, the wooden board 9 is uncovered to observe the damage of the ice layer on the top surface of the test specimen 8, and the broken part of the ice layer on the top surface of the test specimen 8 is cleaned. After the cleaning is completed, the test specimen 8 is weighed to obtain the mass. m 1 Then repeat the process of hitting the steel ball 7 15 to 20 times and weigh and record the mass. m n Finally, according to the residual ice layer rate on the top surface of test specimen 8 The anti-icing performance of asphalt pavement is evaluated based on the changes in

[0029] The above description is merely a preferred embodiment of the present invention and does not constitute any other limitation to the present invention. Any modification or equivalent variation based on the technical essence of the present invention shall still fall within the scope of protection claimed by the present invention.

Claims

1. An impact test device for testing the anti-icing performance of an asphalt pavement, comprising a scale rod (1), a base (2), a cross bar (3), a round wheel (4), an aluminum plate channel (5), a fixing member (6), a steel ball (7), a test specimen (8) and a wooden board (9), characterized in that: The scale rod (1) is fixedly connected to the base (2) and is perpendicular to the base (2). The scale rod (1) includes a non-retractable scale rod portion (11) and a retractable scale rod portion (12). The cross bar (3) and the scale rod (1) are perpendicular to each other, and the cross bar (3) is rotatable. The round wheel (4) is located at the end of the cross bar (3) and is arranged on the inner side of the scale rod (1). The aluminum plate channel (5) includes an aluminum plate (51) and a baffle (52). The aluminum plate (51) is fixedly connected to the cross bar (3). The baffle (52) is fixed on both sides of the aluminum plate (51). The fixing member (6) is arranged on the outer side of the baffle (52). The steel ball (7) can slide on the aluminum plate channel (5) and hit the test specimen (8) covered with a wooden board (9).

2. The impact test device for testing the anti-icing performance of asphalt pavement according to claim 1, characterized in that: The scale of the non-retractable part (11) of the scale rod starts from 0 mm and increases from bottom to top, and the maximum scale is 500-800 mm; the retractable part (12) of the scale rod has three sections, and the scale of each section starts from 0 mm and increases from bottom to top, and the maximum scale is 100-200 mm.

3. The impact test device for testing the anti-icing performance of asphalt pavement according to claim 1, characterized in that: The circular wheel (4) is fixed to the inner side of the top end of the scale rod (1), has a thickness of 10 to 20 mm, and is engraved with a scale on the inner side. The scale starts from 0°, corresponding to the aluminum plate channel (5) being in a horizontal position. As the aluminum plate channel (5) rotates downward, the scale gradually increases, and the maximum scale is 90°, at which time the aluminum plate channel (5) is in a vertical downward position.

4. The impact test device for testing the anti-icing performance of asphalt pavement according to claim 1, characterized in that: The fixing member (6) is formed by a square patch and a clip fixedly connected, the square patch is fixedly attached to the baffle (52), and the fixing member (6) can be fixed to the round wheel (4) through the clip.

5. The impact test device for testing the anti-icing performance of asphalt pavement according to claim 1, characterized in that: The thickness of the ice layer on the surface of the test specimen (8) is 5~10mm.

6. The impact test device for testing the anti-icing performance of asphalt pavement according to claim 1, characterized in that: The test specimen (8) has a length, width and height of 90-100 mm and is covered with a wooden board (9) with the same cross-sectional dimensions and a thickness of 5-12 mm.

7. The impact test device for testing the anti-icing performance of asphalt pavement according to claim 1, characterized in that: The base (2) is an iron or steel plate with a mass of 8 to 10 kg to ensure the balance of the test device.

8. The impact test device for testing the anti-icing performance of asphalt pavement according to claim 1, characterized in that: The height and inclination of the aluminum plate channel (5) are adjustable.

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