Visual observation test system for eroding road asphalt material in dynamic water pressure environment

Abstract

The invention provides a visual observation test system for eroding a road asphalt material in a dynamic water pressure environment, and relates to the technical field of road engineering monitoring. The system comprises a dynamic water pressure environment bin, a transparent closed observation bin, a transparent storage rack and a pipeline connecting piece, a water outlet of the dynamic water pressure environment bin is connected with a water inlet of the transparent closed observation bin through the pipeline connecting piece, the transparent storage rack is arranged in the transparent closed observation bin, and a sample is placed on the storage rack; high-precision cameras are arranged on the top and the side faces of the transparent closed observation bin, a temperature sensor, a water pressure sensor and an exhaust valve are arranged on the top, and bulbs are arranged around the transparent closed observation bin. The system breaks through the limitation that in the prior art, a dynamic water pressure environment can only be simulated and generated in a closed container invisible to naked eyes, and the material degradation process is not clear, and comprehensive revelation of the water damage evolution law and the damage mechanism of gradual collapse of the road asphalt material is achieved. And a foundation is laid for long-life design and toughness improvement of the multi-physics coupling asphalt pavement.

Description

Technical Field

[0001] The present invention relates to the technical field of road engineering monitoring, and in particular to a visual observation test system for the erosion of road asphalt materials by a dynamic water pressure environment. Background Art

[0002] When a vehicle travels on an asphalt road surface with surface water accumulation, a multi-physical field coupling service environment characterized by dynamic water pressure will be formed, causing adverse stress on the asphalt road surface, leading to continuous erosion of the asphalt mixture, and inducing typical water damage problems. The erosion of asphalt mixture by a dynamic water pressure environment often shows obvious erosion of asphalt mortar components and asphalt components, resulting in the gradual opening of internal pore channels in the asphalt mixture and affecting the overall service performance. Therefore, through effective experimental means to effectively simulate and accurately observe and measure the process of road asphalt materials being eroded by a dynamic water pressure environment is the basis for exploring the deep mechanism of water damage of asphalt pavements under the coupling action of multi-physical fields, which is of great significance for the long-life service safety of asphalt pavements in high-temperature and rainy areas in southern China.

[0003] Aiming at the problem of the deterioration of the performance of road asphalt materials caused by a dynamic water pressure environment, current research usually characterizes and analyzes the index changes of the material before and after erosion, such as the mechanical properties of asphalt mixture such as dynamic modulus, the change of void ratio after asphalt mortar erosion, and the comprehensive rheological properties of asphalt. However, there are few literature reports on the specific morphological change process characteristics during the continuous erosion process of road asphalt materials by a dynamic water pressure environment, which is mainly limited by the fact that a dynamic water pressure environment is usually simulated in a closed container of experimental equipment, making it impossible to directly observe the process of its erosion of road asphalt materials. At present, there is a lack of an economical and feasible test device to effectively realize the visual real-time observation of the process of road asphalt materials being eroded by a dynamic water pressure environment, which restricts the deep excavation of the mechanism of water erosion damage of road asphalt materials and restricts the development of the research field of multi-physical field coupling service safety of road asphalt materials.

[0004] Therefore, in order to effectively realize the visual real-time observation of the morphological change process of road asphalt materials being eroded in a multi-physical field coupling service environment involving dynamic water pressure, it is necessary to develop a visual observation test system for the erosion of road asphalt materials by a dynamic water pressure environment. Summary of the Invention

[0005] In order to solve the above technical problems existing in the prior art, an embodiment of the present invention provides a visual observation test system for the erosion of road asphalt materials by a dynamic water pressure environment, realizing the visual real-time observation of the morphological change process of road asphalt materials being eroded by a dynamic water pressure environment. The technical solution is as follows:

[0006] A visualization observation test system for eroding road asphalt materials in a dynamic water pressure environment, comprising a dynamic water pressure environment chamber and a transparent airtight observation chamber. The equipment drain outlet of the dynamic water pressure environment chamber is connected to the container water inlet of the transparent airtight observation chamber through a pipeline connector, so that the water in the dynamic water pressure environment chamber can flow into the transparent airtight observation chamber, thereby realizing the formation of a dynamic water pressure environment in the transparent airtight observation chamber;

[0007] A transparent storage rack is arranged at the bottom inside the transparent airtight observation chamber,

[0008] The top of the transparent airtight observation chamber is tightly connected to the lid by bolts, and the whole formed by the transparent airtight observation chamber and the lid is wrapped with a heat preservation sleeve to ensure that the water temperature is not lost;

[0009] An exhaust valve, a temperature sensor and a water pressure sensor are installed through the lid,

[0010] A high-precision camera is installed at the center of the lid and the center of the side wall of the transparent airtight observation chamber respectively,

[0011] A light bulb is arranged between the transparent airtight observation chamber and the heat preservation sleeve to achieve the purpose of supplementary light observation.

[0012] The equipment drain outlet is arranged at the bottom of the dynamic water pressure environment chamber, and the container water inlet is arranged at a position 1-3 cm from the bottom on the side of the transparent airtight observation chamber.

[0013] The transparent storage rack is fixed to the bottom inside the transparent airtight observation chamber by bolts, and an asphalt coating glass slide sample is placed on the transparent storage rack.

[0014] The transparent airtight observation chamber and the transparent storage rack are made of quartz or hard transparent PVC materials;

[0015] The light bulb is in the form of an LED light strip, and the number of light strips arranged on each of the six surfaces of the transparent airtight observation chamber body is not less than two.

[0016] The number of the high-precision cameras is 1-6. In addition to the center of the lid, the high-precision cameras are also arranged on the front, rear, left, right side or bottom surface of the transparent airtight observation chamber, and the pixel of the high-precision camera is not less than 10 million.

[0017] The system places the asphalt coating glass slide sample on the transparent storage rack to withstand the continuous erosion of the dynamic water pressure environment, and the morphological change characteristics of the material can be observed in real time under the light source background. For example, the bubble holes left by asphalt erosion can be observed.

[0018] Specifically, the application process of the test system includes:

[0019] S1. Test preparation:

[0020] Place the asphalt-coated glass slide specimen on the transparent storage rack, fill water into the dynamic water pressure environment chamber. The water flows into the transparent airtight observation chamber through the equipment drain and the container inlet. By adjusting the exhaust valve, fill the dynamic water pressure environment chamber and the transparent airtight observation chamber with water. After the dynamic water pressure environment chamber is controlled to the target temperature, start to simulate and generate a dynamic water pressure environment;

[0021] S2. Environmental monitoring:

[0022] Connect the dynamic water pressure environment chamber and the transparent airtight observation chamber into a whole through the equipment drain and the container inlet to synchronously generate the same dynamic water pressure environment. Monitor the water temperature and water pressure data of the dynamic water pressure environment in the transparent airtight observation chamber through the temperature sensor and the water pressure sensor respectively, and regularly open the exhaust valve to discharge the gas in the transparent airtight observation chamber;

[0023] S3. Real-time observation:

[0024] Monitor the morphological changes of the asphalt-coated glass slide specimen under the continuous erosion of the dynamic water pressure environment from the top and side of the transparent airtight observation chamber through a high-precision camera. Through the light source background provided by the bulbs distributed around the transparent airtight observation chamber, observe the change process of the bubble holes left by asphalt erosion in real time.

[0025] The temperature range of the dynamic water pressure environment is room temperature - 100°C, the water pressure magnitude range is 0 - 1 MPa, and the water pressure frequency is 0 - 10 Hz.

[0026] The regular opening interval of the exhaust valve in step S2 is 4 s - 1 h.

[0027] The heat preservation effect of the heat preservation sleeve is to set the water temperature ±0.5°C.

[0028] The asphalt pouring thickness of the asphalt-coated glass slide specimen does not exceed 1 cm.

[0029] The beneficial effects brought by the technical solution provided by the embodiment of the present invention at least include:

[0030] (1) The present invention uses an airtight observation chamber made of completely transparent material to connect with the dynamic water pressure environment chamber of the existing experimental equipment to form a whole, which can realize the formation of a dynamic water pressure environment with completely adjustable parameters such as water temperature, water pressure and loading frequency in the transparent airtight observation chamber, so as to realize the visual real-time observation of the morphological change process of road asphalt materials under the continuous erosion of the dynamic water pressure environment, breaking through the limitation of the prior art that can only simulate and generate a dynamic water pressure environment in an airtight container invisible to the naked eye and not knowing the material deterioration process.

[0031] (2)The present invention can realize the monitoring and quantitative evaluation of the process characteristics of the morphological changes of road asphalt materials such as asphalt coating glass slides, asphalt mortar specimens, and asphalt mixtures under continuous erosion by dynamic water pressure through real-time observation from multiple directions with a high-precision camera. This is conducive to explaining the damage development characteristics of the gradual collapse of road asphalt material specimens. Combining with the determination of the deterioration of material service performance, it is possible to comprehensively reveal the evolution law and damage mechanism of water damage, laying a foundation for the long-life design and toughness improvement of asphalt pavements with multi-physical field coupling. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0033] Figure 1 FIG. is a schematic structural diagram of a visual observation test system for eroding road asphalt materials in a dynamic water pressure environment provided by an embodiment of the present invention;

[0034] Figure 2 FIG. is a top view of observing an asphalt material specimen inside a visual observation test system for eroding road asphalt materials in a dynamic water pressure environment provided by an embodiment of the present invention.

[0035] Wherein: 1 - dynamic water pressure environment chamber; 2 - transparent sealed observation chamber; 3 - lid; 4 - exhaust valve; 5 - temperature sensor; 6 - water pressure sensor; 7 - high-precision camera; 8 - heat preservation sleeve; 9 - light bulb; 10 - transparent storage rack; 11 - asphalt coating glass slide specimen; 12 - equipment drain; 13 - pipe connector; 14 - container water inlet; 15 - light source background; 16 - bubble holes left by asphalt erosion. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0036] The following will describe the technical solutions in the present invention in conjunction with the drawings.

[0037] In the embodiments of the present invention, words such as "exemplarily" and "for example" are used to represent examples, illustrations, or explanations. Any embodiment or design solution described as an "example" in the present invention should not be construed as being more preferred or having more advantages than other embodiments or design solutions. Exactly speaking, the use of the word "example" is intended to present concepts in a specific way. In addition, in the embodiments of the present invention, the meaning expressed by "and / or" can be both, or either one of the two.

[0038] In order to make the technical problems to be solved, technical solutions, and advantages of the present invention clearer, the following will be described in detail in conjunction with the drawings and specific embodiments.

[0039] An embodiment of the present invention provides a visualization observation test system for eroding road asphalt materials in a dynamic water pressure environment. As Figure 1 shown in the visualization observation test system for eroding road asphalt materials in a dynamic water pressure environment, it includes a dynamic water pressure environment chamber 1 and a transparent sealed observation chamber 2. The equipment drain port 12 of the dynamic water pressure environment chamber 1 is connected to the container water inlet 14 of the transparent sealed observation chamber 2 through a pipeline connector 13.

[0040] A transparent storage rack 10 is arranged at the bottom inside the transparent sealed observation chamber. The design of the transparent sealed observation chamber and the transparent storage rack is an important innovation of the present invention, which can ensure real-time observation of the dynamic water pressure erosion state of asphalt materials. In the present invention, according to Pascal's law, since both the dynamic water pressure environment chamber and the transparent sealed observation chamber are in a state of being filled with water in a sealed manner, the dynamic water pressure generated by the dynamic water pressure environment chamber can be equivalent to that in the transparent sealed observation chamber, so as to realize direct real-time observation of the erosion process of asphalt materials.

[0041] The top of the transparent sealed observation chamber is tightly connected to the lid 3 through bolts. The whole composed of the transparent sealed observation chamber and the lid is wrapped with a heat preservation sleeve 8 on the outside.

[0042] An exhaust valve 4, a temperature sensor 5 and a water pressure sensor 6 are installed through the lid.

[0043] A high-precision camera 7 is installed at the center of the lid and the center of the side wall of the transparent sealed observation chamber respectively.

[0044] A light bulb 9 is arranged between the transparent sealed observation chamber and the heat preservation sleeve.

[0045] In a specific design, the transparent storage rack 10 is fixed to the bottom inside the transparent sealed observation chamber through bolts, and an asphalt coating glass slide sample 11 is placed on the transparent storage rack.

[0046] The dimensions such as the length, width and height of the transparent sealed observation chamber are all in the range of 5 - 20 cm. The transparent sealed observation chamber and the transparent storage rack can be made of high-temperature resistant transparent materials such as quartz and hard transparent PVC.

[0047] The light bulb is in the form of an LED light strip, and the number of light strips arranged on each of the six sides of the transparent sealed observation chamber body is 3.

[0048] The high-precision cameras are arranged on the top lid and the left and right side surfaces of the transparent sealed observation chamber. The high-precision cameras can be replaced with industrial CCD cameras or cameras.

[0049] The heat preservation sleeve can be replaced with other heating forms to assist in temperature control.

[0050] In a specific test, the process is as follows:

[0051] S1. Test Preparation:

[0052] Place the asphalt-coated glass slide specimen 11 on the transparent storage rack 10. Fill the dynamic water pressure environment chamber 1 with water. The water flows into the transparent airtight observation chamber 2 through the equipment drain port 12 and the container water inlet 14. By adjusting the exhaust valve 4, fill the dynamic water pressure environment chamber 1 and the transparent airtight observation chamber 2 with water. After controlling the temperature of the dynamic water pressure environment chamber 1 to the target temperature of 60 °C, start to simulate the generation of a dynamic water pressure environment, and set the water pressure level to 0.4 MPa and the water pressure frequency to 0.25 Hz.

[0053] S2. Environmental Monitoring:

[0054] Connect the dynamic water pressure environment chamber 1 and the transparent airtight observation chamber 2 as a whole through the equipment drain port 12 and the container water inlet 14 to generate the same dynamic water pressure environment synchronously. Monitor the water temperature and water pressure data of the dynamic water pressure environment in the transparent airtight observation chamber 2 through the temperature sensor 5 and the water pressure sensor 6 respectively. Open the exhaust valve 4 every 5 minutes to discharge the gas in the transparent airtight observation chamber 2.

[0055] S3. Real-time Observation:

[0056] Use the high-precision camera 7 to monitor the morphological changes of the asphalt-coated glass slide specimen 11 under the continuous erosion of the dynamic water pressure environment from the top and side of the transparent airtight observation chamber 2 respectively. Through the light source background 15 provided by the bulbs 9 distributed around the transparent airtight observation chamber 2, observe the change process of the bubble holes 16 left by asphalt erosion in real time.

[0057] As Figure 2 , under the light source background 15, the morphological change characteristics of the asphalt-coated glass slide specimen 11 can be observed in real time. For example, the bubble holes 16 left by asphalt erosion can be observed.

[0058] In a specific test, the pouring thickness of the asphalt on the asphalt-coated glass slide is 2 mm, and the asphalt can be replaced with other road asphalt material specimens such as asphalt mortar and asphalt mixture.

[0059] According to the above method, the present invention can be better realized. By introducing the dynamic water pressure environment in the closed container of the ready-made experimental equipment to the transparent airtight observation chamber through a pipeline, and observing from multiple directions with a high-precision camera, it is convenient and effective to realize the visual real-time observation and quantitative evaluation of the morphological changes of road asphalt materials under the continuous erosion of the dynamic water pressure environment, and comprehensively reveal the water damage evolution law and damage mechanism of the gradual collapse of road asphalt materials, laying a foundation for the long-life design and toughness improvement of asphalt pavements with multi-physical field coupling.

[0060] As described above, it is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, which should all be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims described above.

Claims

1. A visual observation test system for erosion of road asphalt materials in a dynamic water pressure environment, characterized in that: It includes a dynamic water pressure environment chamber and a transparent closed observation chamber, wherein the equipment drain port of the dynamic water pressure environment chamber is connected to the container water inlet of the transparent closed observation chamber through a pipeline connector. A transparent storage rack is placed at the bottom of the transparent and sealed observation chamber. The top of the transparent sealed observation chamber is tightly connected to the lid by bolts, and the transparent sealed observation chamber and the lid are integrally wrapped with an insulation sleeve. The cover is penetrated by an exhaust valve, a temperature sensor and a water pressure sensor. The center of the lid and the center of the side wall of the transparent and sealed observation chamber are respectively equipped with high-precision cameras. A light bulb is arranged between the transparent and airtight observation chamber and the heat-insulating sleeve.

2. The visual observation test system for dynamic water pressure environment erosion of road asphalt materials according to claim 1 is characterized in that: The equipment drain port is arranged at the bottom of the dynamic water pressure environment chamber, and the container water inlet is arranged at the side of the transparent closed observation chamber 1-3 cm away from the bottom.

3. The visual observation test system for dynamic water pressure environment erosion of road asphalt materials according to claim 1 is characterized in that: The transparent storage rack is fixed to the bottom of the transparent and closed observation chamber by bolts, and the asphalt coating glass slide sample is placed on the transparent storage rack.

4. The visual observation test system for dynamic water pressure environment erosion of road asphalt materials according to claim 1 is characterized in that: The transparent sealed observation chamber and transparent storage rack are made of quartz or hard transparent PVC material; The light bulb is in the form of an LED light strip, and the number of light strips arranged on each of the six surfaces of the transparent and sealed observation chamber body is not less than two.

5. The visual observation test system for dynamic water pressure environment erosion of road asphalt materials according to claim 1 is characterized in that: The number of the high-precision cameras is 1-6, and the high-precision cameras are arranged at the front, rear, left, right sides or bottom of the transparent and sealed observation chamber in addition to the center of the lid; The pixel of the high-precision camera is not less than 10 million.

6. The visual observation test system for dynamic water pressure environment erosion of road asphalt materials according to claim 1 is characterized in that: The test system application process includes: S1. Test preparation: Place an asphalt-coated glass slide sample on a transparent rack, and fill water into the dynamic water pressure environment chamber. The water flows into the transparent closed observation chamber through the equipment drain port and the container water inlet. By adjusting the exhaust valve, the dynamic water pressure environment chamber and the transparent closed observation chamber are filled with water. After the dynamic water pressure environment chamber is temperature-controlled to the target temperature, start to simulate the dynamic water pressure environment. S2. Environmental monitoring: The dynamic water pressure environment chamber and the transparent closed observation chamber are connected as a whole through the equipment drain port and the container water inlet, and the same dynamic water pressure environment is generated synchronously. The water temperature and water pressure data of the dynamic water pressure environment in the transparent closed observation chamber are respectively monitored by the temperature sensor and the water pressure sensor, and the exhaust valve is opened regularly to discharge the gas in the transparent closed observation chamber; S3. Real-time observation: High-precision cameras are used to monitor the morphological changes of the asphalt-coated glass slide sample caused by continuous erosion in a dynamic water pressure environment from the top and side of the transparent closed observation chamber. The changes in the bubbles and holes left by asphalt denudation are observed in real time using the light source background provided by the light bulbs distributed around the transparent closed observation chamber.

7. The visual observation test system for dynamic water pressure environment erosion of road asphalt materials according to claim 6 is characterized in that: The temperature range of the dynamic water pressure environment is room temperature-100° C., the water pressure magnitude range is 0-1 MPa, and the water pressure frequency is 0-10 Hz.

8. The visual observation test system for dynamic water pressure environment erosion of road asphalt materials according to claim 6 is characterized in that: The exhaust valve is opened periodically in step S2 at intervals of 4 seconds to 1 hour.

9. The visual observation test system for dynamic water pressure environment erosion of road asphalt materials according to claim 6, characterized in that: The heat preservation effect of the heat preservation sleeve is set water temperature ± 0.5 ° C.

10. The visual observation test system for dynamic water pressure environment erosion of road asphalt materials according to claim 6, characterized in that: The asphalt pouring thickness of the asphalt coating glass slide sample does not exceed 1 cm.

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