A simple scouring test device for base course mixture with adjustable water pressure

Abstract

The utility model provides a simple and easy scouring test device of base layer mixture with adjustable water pressure belongs to civil engineering material testing arrangement field, including base, support frame, test cylinder, mixture test piece and central controller, the test cylinder sets up on the base, the mixture test piece sets up in the inside of test cylinder, the support frame sets up the outside of test cylinder, and support frame sets up on the base, the top of support frame is provided with water pipe, and one end of water pipe sets up the just above of test cylinder, the other end of water pipe is connected with water pressure machine, be provided with water pressure controller on water pipe, central controller is connected with water pressure machine and water pressure controller respectively. The utility model discloses through water pipe jet flow, carries out the scouring to the mixture test piece in test cylinder, can pass through water pressure controller to adjust the flow pressure in the scouring process, then tests the scouring performance of base layer mixture through the test mixture test piece quality after scouring.

Description

Technical Field

[0001] This utility model relates to the field of testing devices for civil engineering materials, and in particular to a simple erosion resistance testing device for base course mixtures with adjustable water pressure. Background Technology

[0002] Currently, most road surfaces use semi-rigid base courses such as cement-stabilized crushed stone. However, after a period of service, asphalt pavements may develop "top-down" fatigue cracks and "down-top" reflective cracks. Under severe conditions such as heavy rainfall, prolonged rainfall duration, and freeze-thaw cycles, water will accumulate on the road surface and inside the asphalt mixture, which will severely damage the structural and mechanical stability of the road mixture. Under traffic loads, water accumulated on the road surface and inside the asphalt mixture will be forced into the pavement structural layer along cracks or areas with large voids, forming "internal stagnant water." Under repeated traffic loads, this "internal stagnant water" will generate dynamic water pressure and continuous "pumping" action. The high-speed water flow will scour the mixture, leading to severe water damage such as rutting, potholes, and mud pumping. Water damage is a common problem for asphalt roads, and the erosion resistance and durability of the semi-rigid base course are of great significance to the overall structural stability of the asphalt pavement. If the base course mixture has poor erosion resistance, it will peel off rapidly under the repeated impact of high-speed water flow, and voids will quickly appear between the base course and the asphalt layer, causing instability in the pavement structure.

[0003] As the controllers of project quality, on-site laboratories in road engineering play a crucial role in testing the erosion resistance of base course mixtures. The "Test Procedures for Inorganic Binder Stabilized Materials in Highway Engineering" (JTG E51-2009) specifies the erosion resistance test methods for inorganic binder stabilized materials. These methods require an MTS testing machine or other testing equipment capable of applying vibration loads (such as an erosion testing machine). Representative equipment for evaluating the erosion performance of road base course materials includes rotating brushes and shaking table testers. However, on-site laboratories generally cannot meet these requirements, lacking expensive MTS testing machines or specialized erosion resistance equipment, thus creating a gap in the testing of the erosion resistance of base course mixtures. How to quickly test and evaluate the erosion resistance of base course mixtures in on-site laboratories is an urgent problem to be solved. Therefore, a simple erosion resistance testing device for base course mixtures with adjustable water pressure is needed. Utility Model Content

[0004] The purpose of this invention is to provide a simple erosion resistance testing device for base course mixtures with adjustable water pressure, addressing the technical gap in existing field laboratories' testing of the erosion resistance durability of base course mixtures. This invention is a simple erosion resistance testing device for road base course mixtures with adjustable water pressure, designed for laboratory use. The device uses a water flow at a certain pressure (the water pressure and scouring frequency are adjustable) to scour the base course mixture. The erosion resistance durability of the base course mixture is evaluated based on mass loss; the smaller the mass loss, the stronger the erosion resistance. It can quickly test the erosion resistance of base course mixtures, thereby evaluating their erosion resistance durability. The device has a simple structure (no need for an MTS testing machine or other testing equipment capable of applying vibration loads), is easy to operate, has good stability, and is highly scalable. It can quickly test the erosion resistance durability of base course mixtures, which is of great significance for the material optimization and quality control of road base course mixtures.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A simple erosion resistance testing device for base course mixtures with adjustable water pressure includes a base, a support frame, a test cylinder, a mixture specimen, and a central controller. The test cylinder is mounted on the base, and the mixture specimen is placed inside the test cylinder. The support frame is located outside the test cylinder and is mounted on the base. A water pipe is installed on the top of the support frame, with one end of the water pipe positioned directly above the test cylinder. The other end of the water pipe is connected to a water pressure machine, and a water pressure controller is installed on the water pipe. The central controller is connected to both the water pressure machine and the water pressure controller.

[0007] Furthermore, the mixture specimen is connected to the test cylinder by fixing screws, and a water leakage port is provided on the side wall of the test cylinder. The test cylinder is configured as a cylindrical structure with an open top and a sealed bottom.

[0008] Furthermore, the support frame includes four support columns and a cover plate, the four support columns are respectively disposed on the base, and the cover plate is disposed on the top of the four support columns.

[0009] Furthermore, a reserved interface is provided in the middle of the cover plate, one end of the water pipe is provided on the reserved interface, and a water spray nozzle is provided at one end of the water pipe, which is located directly above the test cylinder.

[0010] Furthermore, the water pressure machine is provided with an inlet and an outlet, the inlet being connected to an external water source and the outlet being connected to a water pipe.

[0011] Furthermore, a differential pressure gauge and an electrically controlled valve are respectively installed on both sides of the water pressure controller. The electrically controlled valve is located at the end of the water pipe near the water pressure machine and is connected to the central controller. The differential pressure gauge is located in the middle of the water pipe.

[0012] This utility model, by adopting the above-mentioned technical solution, has the following beneficial effects:

[0013] 1. This utility model uses water jets from a water pipe to flush the mixture specimen inside the test cylinder. By testing the quality of the mixture specimen after flushing, the erosion resistance of the base mixture is tested, thereby evaluating the erosion resistance durability of the base mixture and controlling the construction quality of the base mixture.

[0014] 2. This utility model can adjust the water pressure through a water pressure controller and adjust the scouring frequency and scouring time through a central controller according to the actual engineering conditions (rainfall, traffic flow, etc.) to study the influence of the above factors on the scouring resistance of the base mixture specimen.

[0015] 3. This utility model has a simple structure (no need for an MTS testing machine or other testing equipment capable of applying vibration loads), is easy to operate, has good stability, and is suitable for construction site laboratories. It fills the gap in the testing of the erosion resistance durability of base course mixtures in construction site laboratories, has strong scalability, and can quickly test the erosion resistance durability of base course mixtures. It is of great significance for the material optimization and quality control of road base course mixtures. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the experimental device of this utility model.

[0017] In the attached diagram, 1-base, 2-leakage outlet, 3-fixing screw, 4-support frame, 41-support column, 42-cover plate, 43-reserved interface, 5-test cylinder, 6-mixture specimen, 7-spray nozzle, 8-water pipe, 9-differential pressure gauge, 10-water pressure controller, 11-electric valve, 12-outlet, 13-inlet, 14-water pressure machine, 15-central controller. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this utility model clearer, the following detailed description is provided with reference to the accompanying drawings and preferred embodiments. However, it should be noted that many details listed in the specification are merely to provide the reader with a thorough understanding of one or more aspects of this utility model, and these aspects can be achieved even without these specific details.

[0019] like Figure 1As shown, a simple erosion resistance testing device for base mixture with adjustable water pressure includes a base 1, a support frame 4, a test cylinder 5, a mixture specimen 6, and a central controller 15. The test cylinder 5 is mounted on the base 1, which supports the testing device. The mixture specimen 6 is placed inside the test cylinder 5. The support frame 4 is mounted on the outside of the test cylinder 5 and on the base 1. A water pipe 8 is mounted on the top of the support frame 4, with one end of the water pipe 8 positioned directly above the test cylinder 5. The water pipe 8 guides the water flow, and the other end of the water pipe 8 is connected to a water pressure machine 14. The water pressure machine 14 is used to deliver the water flow and is equipped with a booster pump to increase the water flow pressure as needed. A water pressure controller 10 is mounted on the water pipe 8 to adjust the water flow pressure. The central controller 15 is connected to both the water pressure machine 14 and the water pressure controller 10, and is used to set experimental parameters (water flow pressure, erosion frequency, etc.).

[0020] The mixture specimen 6 is connected to the test cylinder 5 by fixing screws 3. The fixing screws 3 are used to fix the mixture specimen and prevent it from moving. A drain outlet 2 is provided on the side wall of the test cylinder 5 to drain the test water. The test cylinder 5 is a cylindrical structure with an open top and a closed bottom, which facilitates the water sprayed from the nozzle 7 to rinse the mixture specimen 6. The support frame 4 includes four support columns 41 and a cover plate 42. The four support columns 41 are respectively set on the base 1, and the cover plate 42 is set on the top of the four support columns 41. The support frame 4 is used to position the water nozzle of the water pipe above the mixture specimen to achieve a rinsing effect. A reserved interface 43 is provided in the middle of the cover plate 42. One end of the water pipe 8 is set on the reserved interface 43, and a water nozzle 7 is provided at one end of the water pipe 8. The water nozzle 7 is set directly above the test cylinder 5 and is used to spray water to rinse the mixture specimen. Water from pipe 8 is sprayed down from directly above test cylinder 5, causing the water to flow in the forward direction and wash over the mixture specimen.

[0021] The water pressure press 14 is equipped with an inlet 13 and an outlet 12. The inlet 13 is connected to an external water source, which enters the water pressure press 14 through the inlet 13. The outlet 12 is connected to a water pipe 8, and water from the water pressure press 14 enters the water pipe 8 through the outlet 12. A differential pressure gauge 9 and an electrically controlled valve 11 are respectively installed on both sides of the water pressure controller 10. The electrically controlled valve 11 is located at the end of the water pipe 8 near the water pressure press 14 and is connected to the central controller 15. The electrically controlled valve 11 is used to cut off and regulate the water flow. The differential pressure gauge 9 is located in the middle of the water pipe 8 and is used to measure the water flow pressure. The central controller 15 controls the opening and closing of the electrically controlled valve 11 by measuring the water flow pressure in the water pipe 8 in real time using the differential pressure gauge 9.

[0022] Example 1

[0023] The specific steps for using a simple erosion resistance testing device for road base mixture with adjustable water pressure are as follows:

[0024] (1) Weigh the mass of the mixture specimen, place the mixture specimen in the test bucket, and fix the test bucket and mixture specimen with fixing screws;

[0025] (2) Turn on the central controller and set the test parameters (water pressure, flushing frequency, flushing time, etc.). The water pressure adjustment range is 0.2MPa~0.7MPa, and the flushing frequency adjustment range is 5Hz~15Hz. The specific test parameters are determined according to the actual situation. It is recommended to adjust the water pressure to 0.5MPa, the flushing frequency to 10Hz, and the flushing time to 30min.

[0026] (3) Turn on the water pressure machine and flush the mixture specimen with water flow of a certain water pressure and frequency. After flushing for a period of time, remove the mixture specimen.

[0027] (4) Dry the specimen in an oven at 80°C for 48 hours;

[0028] (5) Test the mass of the dried mixture specimen. The erosion resistance of the mixture specimen is evaluated by mass loss (the difference between the initial mass of the mixture specimen and the mass of the dried mixture specimen after erosion). The greater the mass loss, the weaker the erosion resistance of the mixture specimen. The smaller the mass loss, the stronger the erosion resistance of the mixture specimen.

[0029] This simplified erosion resistance testing device for road base course mixtures evaluates the erosion resistance durability of base course mixtures based on mass loss; the smaller the mass loss, the stronger the erosion resistance of the mixture. It can quickly test the erosion resistance of base course mixtures, thereby evaluating their erosion resistance durability. On-site laboratories can assemble this setup to test the erosion resistance of base course mixtures and control the construction quality of base course mixtures.

[0030] The test apparatus can adjust the water pressure, scouring frequency, and scouring time according to the actual engineering conditions (rainfall, traffic flow, etc.) to study the influence of the above factors on the scouring resistance of the base mixture specimens.

[0031] The test device has a simple structure (no need for an MTS tester or other test equipment capable of applying vibration loads), is easy to operate, has good stability, and can be assembled in on-site laboratories with the necessary conditions. It has strong scalability and can quickly test the erosion resistance of base course mixtures, which is of great significance for the material optimization and quality control of road base course mixtures.

[0032] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A simple erosion resistance testing device for base course mixtures with adjustable water pressure, characterized in that: The device includes a base (1), a support frame (4), a test cylinder (5), a mixture specimen (6), and a central controller (15). The test cylinder (5) is placed on the base (1), the mixture specimen (6) is placed inside the test cylinder (5), the support frame (4) is placed outside the test cylinder (5), and the support frame (4) is placed on the base (1). A water pipe (8) is provided on the top of the support frame (4), and one end of the water pipe (8) is placed directly above the test cylinder (5). The other end of the water pipe (8) is connected to a water pressure machine (14), and a water pressure controller (10) is provided on the water pipe (8). The central controller (15) is connected to the water pressure machine (14) and the water pressure controller (10) respectively.

2. The simple erosion resistance test device for base course mixture with adjustable water pressure according to claim 1, characterized in that: The mixture specimen (6) is connected to the test cylinder (5) by fixing screws (3). A water outlet (2) is provided on the side wall of the test cylinder (5). The test cylinder (5) is a cylindrical structure with an open top and a sealed bottom.

3. The simple erosion resistance testing device for base course mixture with adjustable water pressure according to claim 1, characterized in that: The support frame (4) includes four support columns (41) and a cover plate (42). The four support columns (41) are respectively set on the base (1), and the cover plate (42) is set on the top of the four support columns (41).

4. The simple erosion resistance testing device for base course mixture with adjustable water pressure according to claim 3, characterized in that: The cover plate (42) has a reserved interface (43) in the middle. One end of the water pipe (8) is set on the reserved interface (43), and one end of the water pipe (8) is set with a water nozzle (7). The water nozzle (7) is set directly above the test tube (5).

5. A simple erosion resistance testing device for base course mixture with adjustable water pressure according to claim 1, characterized in that: The water press (14) is provided with an inlet (13) and an outlet (12). The inlet (13) is connected to an external water source, and the outlet (12) is connected to a water pipe (8).

6. The simple erosion resistance testing device for base course mixture with adjustable water pressure according to claim 1, characterized in that: The water pressure controller (10) is provided with a differential pressure gauge (9) and an electric control valve (11) on both sides respectively. The electric control valve (11) is located at one end of the water pipe (8) near the water pressure machine (14) and is connected to the central controller (15). The differential pressure gauge (9) is located in the middle of the water pipe (8).

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