Testing device and evaluation method for slurry pumping and whitening resistance of asphalt pavement of concrete bridge deck

Abstract

The invention relates to the technical field of asphalt pavement detection equipment, and provides a concrete bridge deck asphalt pavement pumping and whitening resistance testing device and evaluation method.The concrete bridge deck asphalt pavement pumping and whitening resistance testing device comprises a base groove and a hollowed-out plate arranged in the base, scale marks are formed in the base groove, and a calcium ion solution (Ca (OH) 2 or a CaCO3 solution and the like) is arranged in the base groove; the cover body is used for being adaptively inserted into the base groove to form a closed space; the loading assembly is arranged in the cover body, and the loading assembly comprises a loading wheel and a motor used for driving the loading wheel; the supporting table is mounted on the hollow plate and is used for mounting the loading assembly; and the asphalt mixture track plate is arranged between the loading wheel and the hollow plate, and the loading wheel is pressed on the asphalt mixture track plate. According to the invention, the spurting and whitening resistance of asphalt pavement can be effectively evaluated, and the accuracy of the test result is high.

Description

Technical Field

[0001] The invention relates to the technical field of asphalt pavement detection equipment, and in particular to a device and an evaluation method for testing the anti-slurry whitening ability of asphalt pavement on a concrete bridge deck. Background Art

[0002] As the main component of the bridge deck system, the asphalt pavement structure not only directly bears the traffic load, but also prevents the erosion and damage of the lower structure caused by the infiltration of environmental factors such as rainwater. Therefore, the performance of the asphalt pavement structure seriously affects the service life of the bridge. Slurry pumping is a common disease phenomenon of the asphalt pavement layer of cement concrete bridge decks, and it is easy to further develop into a more serious disease phenomenon with the influence of environmental effects and traffic loads. In addition, according to the causes of slurry pumping, it can be divided into load-bearing type and non-load-bearing type. Load-bearing slurry pumping is mainly caused by the upward migration of cement slurry on the cement concrete bridge deck under the combined effects of precipitation and traffic loads. On the other hand, non-load-bearing slurry pumping is mainly caused by the migration of the lower slurry through the gaps under the influence of penetration, diffusion, capillary and other effects.

[0003] Therefore, in order to accurately evaluate the ability of different asphalt mixtures on cement concrete bridge decks to resist pumping and whitening, a method that can be used to evaluate the performance of asphalt mixtures on concrete bridge decks in resisting load-type and non-load-type pumping and whitening is designed, which will help provide treatment methods and ideas for dealing with this problem. Summary of the invention

[0004] The purpose of the present invention is to provide a testing device and an evaluation method for the anti-slurry whitening ability of asphalt pavement on a concrete bridge deck, which can effectively evaluate the anti-slurry whitening ability of asphalt pavement, and the test results are highly accurate.

[0005] The embodiments of the present invention are realized through the following technical scheme: a device for testing the anti-slurry whitening ability of asphalt pavement on a concrete bridge deck, comprising a base groove and a hollow plate arranged in the base, the base groove is provided with scale lines, and a calcium ion solution is arranged in the base groove; a cover body, which is adapted to be inserted into the base groove to form a closed space; a loading assembly, which is arranged in the cover body, and the loading assembly includes a loading wheel and a motor for driving the loading wheel; a support table, which is installed on the hollow plate for installing the loading assembly; an asphalt mixture rutting plate, which is arranged between the loading wheel and the hollow plate, and the loading wheel is pressed on the asphalt mixture rutting plate.

[0006] Furthermore, it also includes a boosting component, which includes an air pump, an air pipe, an air pressure display and an air pressure sensor. Both ends of the air pipe are respectively connected to the air pump and the air pressure sensor, and the air pressure sensor is arranged on the support platform.

[0007] Furthermore, the loading assembly also includes a connecting frame, and the loading wheels are provided with at least two evenly spaced around the connecting frame; a transmission rod is provided in the middle of the connecting frame, and the transmission rod is installed on the support platform.

[0008] Furthermore, a plurality of supporting feet for supporting and lifting the hollow plate are installed on the inner wall of the base groove.

[0009] Furthermore, the support platform includes a support base and a mounting plate, both ends of the mounting plate are plugged into the support base, and the side end surface of the support base is provided with a plurality of tightening screws for tightening the mounting plate.

[0010] Furthermore, it also includes a tray, the transmission rod is connected to the motor, the motor is installed on the tray, and the bottom of the tray is hinged to the upper surface of the mounting plate; a vertical loader, a front end of which is connected to act on the transmission rod; a slide is installed on the hollow plate, the support base is slidably connected to the slide, and a horizontal loader is installed on the inner wall of the base groove, and the front end of the horizontal loader is connected to the support base.

[0011] Furthermore, a plurality of circular through holes are evenly formed on the hollow plate.

[0012] Furthermore, the base groove and the cover body are made of transparent material.

[0013] An evaluation method based on the above-mentioned concrete bridge deck asphalt pavement anti-slurry whitening ability testing device comprises the following steps:

[0014] S1, a certain amount of solution containing calcium ions such as Ca(OH)2 or CaCO3 solution is placed in the base tank;

[0015] S2, placing the hollow plate together with the support platform and the loading assembly in the base groove;

[0016] S3, placing the formed asphalt mixture rutting plate to be tested in the middle of the hollow plate;

[0017] S4, adjusting the height of the loading wheel so that the asphalt mixture rutting plate is placed below the loading wheel;

[0018] S5, install and buckle the cover, seal the place where the pipeline passes through, observe the liquid level scale and record it, turn on the air pump and motor, and drive the loading wheel to rotate for testing;

[0019] S6, wait for a certain loading time, turn off the motor and air pump, and observe the liquid level scale value at this moment.

[0020] The technical solution of the embodiment of the present invention has at least the following advantages and beneficial effects:

[0021] 1. By placing the asphalt rutting plate in a base tank containing calcium ion solution to simulate a rainy environment, the anti-whitening performance of the asphalt mixture is obtained by recording the test data;

[0022] 2. The air pump and air pressure sensor are set to simulate the pressure difference between the asphalt mixture pavement and the interior, which increases the speed at which the calcium ion solution (Ca(OH)2 or CaCO3 solution, etc.) enters the asphalt mixture rutting plate to produce the whitening phenomenon, thereby improving the test efficiency;

[0023] 3. The loading wheel is set to simulate the periodic rolling of the asphalt mixture by the car, which fully restores the whitening phenomenon caused by water accumulation on the road after rain. The simulation test data has high authenticity and accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0025] Figure 1 A schematic diagram of the structure of a testing device provided in an embodiment of the present invention;

[0026] Figure 2 It is a schematic diagram of the internal structure of the cover of the testing device in the present invention;

[0027] Figure 3 It is a schematic diagram of the structure of the loading component in the present invention;

[0028] Figure 4 This is a schematic diagram of the installation position of the air pressure sensor in the present invention;

[0029] Figure 5 It is a structural schematic diagram of the support platform in the present invention;

[0030] Figure 6 A top view of the base groove in the present invention;

[0031] Figure 7 This is a schematic diagram of the structure of Example 2 of the present invention.

[0032] Icons: 1-base groove, 11-scale line, 12-support foot, 2-cover, 3-loading assembly, 31-loading wheel, 32-motor, 33-connecting frame, 34-transmission rod, 4-support platform, 41-mounting plate, 411-tray, 42-support base, 43-tightening screw, 5-hollow plate, 51-circular through hole, 6-boosting assembly, 61-air pump, 62-air pipe, 63-air pressure display, 64-air pressure sensor, 7-asphalt mixture rutting plate, 8-vertical loader, 9-horizontal loader, 10-slide.

[0033] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0034] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0036] Embodiment 1: The following is further described in conjunction with specific embodiments, referring to Figure 1-Figure 6 As shown, this embodiment is a device for testing the anti-pumping and whitening ability of asphalt pavement on concrete bridge deck, comprising a base groove 1 and a hollow plate 5 arranged in the base, the base groove 1 is provided with a scale line 11, and the base groove 1 is provided with a calcium ion solution; a cover 2, which is adapted to be inserted into the base groove 1 to form a closed space; a loading component 3, which is arranged in the cover 2, and the loading component 3 includes a loading wheel 31 and a motor 32 for driving the loading wheel 31; a support table 4, which is installed on the hollow plate 5 for installing the loading component 3; an asphalt mixing The asphalt mixture rutting plate 7 is arranged between the loading wheel 31 and the hollow plate 5, and the loading wheel 31 is pressed on the asphalt mixture rutting plate 7; specifically, the material to be tested is made into an asphalt mixture rutting plate 7 specimen, a calcium ion solution of a certain depth is injected into the base groove 1, and the hollow plate 5 is loaded into the base groove 1, and the formed asphalt mixture rutting plate 7 is placed on the hollow plate 5, and the starting motor 32 drives the loading wheel 31 to rotate for testing. The calcium ion solution here can be Ca(OH)2 and CaCO3 solution, etc.

[0037] It should be noted that the evaluation index D (ml / h) of asphalt mixture's ability to resist whitening due to pumping is as follows:

[0038] D=(K2-K1) / t

[0039] Among them, K2 represents the liquid level scale in the transparent glass base 2 just after the lime water is injected; K1 represents the liquid level scale when the test is terminated; t represents the test time.

[0040] During this time, the difference of the scale line 11 reflects the ability to resist whitening from the side, and the smaller the value of D is, the stronger the ability is.

[0041] The present embodiment also includes a boosting component 6, which includes an air pump 61, an air pipe 62, an air pressure display 63 and an air pressure sensor 64. The two ends of the air pipe 62 are respectively connected to the air pump 61 and the air pressure sensor 64, and the air pressure sensor 64 is arranged on the support platform 4; specifically, when the air pipe 62 and others are connected to the cover body 2, a good sealing work is done, and the air pump 61 is started to control the air pressure in the cover body 2. The air pressure sensor 64 can monitor the pressure in the cover body 2 in real time and feed it back to the air pressure display 63 for the operator to obtain. This boosting component 6 is used to simulate the air pressure difference between the road surface and the road, which further improves the accuracy and authenticity of the test data.

[0042] Reference Figure 2 and Figure 3 As shown, the loading assembly 3 in this embodiment also includes a connecting frame 33, and at least two loading wheels 31 are arranged evenly spaced around the connecting frame 33; a transmission rod 34 is provided in the middle of the connecting frame 33, and the transmission rod 34 is installed on the support platform 4; specifically, the motor 32 drives the transmission rod 34 to rotate, and the connecting frame 33 is a triangular structure. When the transmission rod 34 drives the connecting frame 33 to rotate, multiple loading wheels 31 act alternately on the asphalt mixture rutting plate 7 to achieve the effect of simulating the wheels of a car passing over the asphalt pavement.

[0043] Reference Figure 6 As shown, a plurality of support legs 12 for supporting and lifting the hollow plate 5 are installed on the inner wall of the base groove 1; specifically, when the hollow plate 5 is installed in the base groove 1 through the support legs 12, a certain distance is left between the hollow plate 5 and the bottom of the base groove 1.

[0044] like Figure 3 and Figure 5As shown, the support platform 4 in this embodiment includes a support base 42 and a mounting plate 41. Both ends of the mounting plate 41 are plugged into the support base 42, and the side end surface of the support base 42 is provided with a plurality of tightening screws 43 for tightening the mounting plate 41; specifically, the mounting plate 41 can be moved upward in the slot of the support base 42 to adjust the position, and is fixed by the tightening screws 43 provided on the side, and the height of the loading wheel 31 is changed by adjusting the mounting plate 41.

[0045] In order to facilitate processing, a plurality of circular through holes 51 are evenly formed on the hollow plate 5 .

[0046] In order to facilitate observation of the depth of lime water in the base groove 1 and the effects of the loading wheel 31 and the asphalt mixture rutting plate 7, the base groove 1 and the cover body 2 are made of transparent materials, such as acrylic or glass.

[0047] An evaluation method based on the above-mentioned concrete bridge deck asphalt pavement anti-slurry whitening ability testing device comprises the following steps:

[0048] S1, a certain amount of calcium ion solution such as Ca(OH)2 or CaCO3 solution is placed in the base tank 1, and the height thereof is not higher than the maximum height of the base tank 1;

[0049] S2, placing the hollow plate 5 together with the support platform 4 and the loading assembly 3 in the base groove 1;

[0050] S3, placing the formed asphalt mixture rutting plate 7 to be tested in the middle of the hollow plate 5;

[0051] S4, adjusting the height of the loading wheel 31, adjusting the height of the loading wheel 31 by moving the mounting plate 41 and the supporting base 42 up and down, so that the asphalt mixture rutting plate 7 is placed below the loading wheel 31;

[0052] S5, install and buckle the cover 2, and seal the place where the pipeline passes through. Vaseline or epoxy resin can be used to seal the hole where the official line passes through, observe the liquid level scale and record it, turn on the air pump 61 and the motor 32, and drive the loading wheel 31 to rotate for testing;

[0053] S6, wait for a certain loading time, turn off the motor 32 and the air pump 61, observe the liquid level scale value at this moment, and calculate the D value.

[0054] In order to clarify the anti-pumping and whitening properties of the mixture, asphalt mixture rutting slabs 7 specimens with different void ratios can be made for comparison.

[0055] Example 2: Figure 7As shown, on the basis of Example 1, this embodiment also includes a tray 411, a transmission rod 34 is connected to the motor 32, the motor 32 is installed on the tray 411, and the bottom of the tray 411 is hinged to the upper surface of the mounting plate 41; in addition, a vertical loader 8, a front end of which is connected to act on the transmission rod 34; a bearing is sleeved on the transmission rod 34, and the vertical loader 8 is hinged at the bearing, and the loading wheel 31 is driven by the vertical loader 8 to contact the test piece in an inclined state through pressure, and the loading core load can be adjusted to obtain evaluation data under more environments.

[0056] A slideway 10 is installed on the hollow plate 5, and the support base 42 is slidably connected to the slideway 10. A horizontal loader 9 is installed on the inner wall of the base groove 1, and the front end of the horizontal loader 9 is connected to the support base 42; specifically, the horizontal loader 9 drives the support platform 4, the vertical loader 8 and the loading wheel 31 to move as a whole. When the loading wheel 31 contacts the asphalt mixture rutting plate 7 specimen for testing, the horizontal loading force can be adjusted for testing, which is conducive to obtaining more comprehensive test data.

[0057] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A device for testing the anti-slurry whitening ability of concrete bridge deck asphalt pavement, characterized by: It comprises a base groove (1) and a hollow plate (5) arranged in the base, the base groove (1) is provided with a scale line (11), and a calcium ion solution is arranged in the base groove (1); A cover body (2) adapted to be inserted into the base groove (1) to form a closed space; A loading assembly (3) is arranged in the cover (2), and the loading assembly (3) comprises a loading wheel (31) and a motor (32) for driving the loading wheel (31); A support platform (4) mounted on the hollow plate (5) for mounting the loading assembly (3); An asphalt mixture rutting plate (7) is arranged between the loading wheel (31) and the hollow plate (5), and the loading wheel (31) is pressed on the asphalt mixture rutting plate (7).

2. The device for testing the anti-slurry whitening ability of concrete bridge deck asphalt pavement according to claim 1 is characterized in that: The device also includes a booster assembly (6), the booster assembly (6) including an air pump (61), an air pipe (62), an air pressure display (63) and an air pressure sensor (64), the two ends of the air pipe (62) being respectively connected to the air pump (61) and the air pressure sensor (64), and the air pressure sensor (64) being arranged on the support platform (4).

3. The device for testing the anti-slurry whitening ability of concrete bridge deck asphalt pavement according to claim 1 is characterized in that: The loading assembly (3) further comprises a connecting frame (33), and the loading wheel (31) is provided with at least two evenly spaced ones arranged around the connecting frame (33); A transmission rod (34) is provided in the middle of the connection frame (33), and the transmission rod (34) is installed on the support platform (4).

4. The device for testing the anti-slurry whitening ability of concrete bridge deck asphalt pavement according to claim 3 is characterized by: The support platform (4) comprises a support base (42) and a mounting plate (41), the two ends of the mounting plate (41) are plugged into the support base (42), and the side end surface of the support base (42) is provided with a plurality of tightening screws (43) for tightening the mounting plate (41).

5. The device for testing the anti-slurry whitening ability of concrete bridge deck asphalt pavement according to claim 4 is characterized in that: It also includes a tray (411), the transmission rod (34) is connected to the motor (32), the motor (32) is installed on the tray (411), and the bottom of the tray (411) is hinged to the upper surface of the mounting plate (41); A vertical loader (8), the front end of which is connected to act on the transmission rod (34); A slideway (10) is installed on the hollow plate (5), the support base (42) is slidably connected to the slideway (10), a horizontal loader (9) is installed on the inner wall of the base groove (1), and the front end of the horizontal loader (9) is connected to the support base (42).

6. The device for testing the anti-slurry whitening ability of concrete bridge deck asphalt pavement according to claim 1 is characterized by: The inner wall of the base groove (1) is provided with a plurality of support legs (12) for supporting and lifting the hollow plate (5).

7. The device for testing the anti-slurry whitening ability of concrete bridge deck asphalt pavement according to claim 1 is characterized by: The hollow plate (5) is evenly provided with a plurality of circular through holes (51).

8. The device for testing the anti-slurry whitening ability of concrete bridge deck asphalt pavement according to claim 1 is characterized by: The base groove (1) and the cover body (2) are made of transparent material.

9. An evaluation method based on the device for testing the anti-slurry whitening ability of concrete bridge deck asphalt pavement according to any one of claims 1 to 8, characterized in that: The steps include: S1, a certain amount of lime water is placed in the base tank (1); S2, placing the hollow plate (5) together with the support platform (4) and the loading assembly (3) in the base groove (1); S3, placing the molded asphalt mixture rutting plate (7) to be tested in the middle of the hollow plate (5); S4, adjusting the height of the loading wheel (31) so that the asphalt mixture rutting plate (7) is placed below the loading wheel (31); S5, install and buckle the cover (2), seal the place where the pipeline passes through, observe and record the liquid level, turn on the air pump (61) and the motor (32), and drive the loading wheel (31) to rotate for testing; S6, wait for a certain loading time, turn off the motor (32) and the air pump (61), observe and record the liquid level scale value at this moment, and calculate according to the measurement formula.

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