SBS modified asphalt concrete permeability detection equipment

Abstract

The invention relates to the technical field of concrete detection, and discloses SBS modified asphalt concrete permeability detection equipment which comprises a base, a supporting table, a side plate, a sealing limiting assembly, a vibration excitation assembly, a data acquisition assembly, a sensing monitoring assembly, an environment simulation assembly and a control system. A supporting plate for supporting an asphalt sample is arranged on the supporting table, and a water storage cavity is formed among the side plate, the supporting table and the base; the sealing limiting assembly is used for selectively cooperating with the supporting table to form a test chamber; the vibration excitation assembly is used for generating air pressure waves to apply vibration for simulating a traffic load to the asphalt sample; the data acquisition assembly is used for acquiring vibration spectrum and sound wave attenuation characteristics of the asphalt sample; the sensing monitoring assembly is used for collecting acoustic signals and thermal field signals of an asphalt sample; the environment simulation assembly is used for adjusting the temperature and humidity in the test chamber. According to the invention, the pressure generated by the tire on the road surface can be simulated more accurately, so that the accuracy of asphalt sample testing can be improved.

Description

A device for testing the permeability of SBS modified asphalt concrete Technical Field

[0001] This invention relates to the field of concrete testing technology, and more specifically, to a device for testing the permeability of SBS modified asphalt concrete. Background Technology

[0002] SBS-modified asphalt concrete, as a high-performance pavement material, is widely used in highways, urban roads, and other engineering fields. SBS (styrene-butadiene-styrene) modifiers can significantly improve the high-temperature stability, low-temperature crack resistance, and aging resistance of asphalt. However, the permeability of SBS-modified asphalt concrete directly affects its durability and service life; excessive permeability can lead to moisture intrusion into the pavement structural layers, causing pavement damage.

[0003] Currently, existing methods for testing the permeability of asphalt concrete mainly include constant head permeability tests, variable head permeability tests, and vacuum saturation methods. However, these methods have the following technical drawbacks: First, traditional testing methods are usually conducted under static conditions, but actual road surfaces experience periodic vibrations under vehicle loads. This vibration affects the pore structure inside the asphalt concrete, thus affecting its permeability. This can easily lead to significant differences between the test results and the actual usage environment, making it difficult to reflect the impact of actual traffic loads on permeability. Second, traditional testing methods are usually conducted under single environmental conditions, but the permeability of asphalt concrete is significantly affected by ambient temperature and humidity. The permeability of asphalt concrete varies considerably under different temperature and humidity conditions.

[0004] Therefore, we propose a device for testing the permeability of SBS modified asphalt concrete. Summary of the Invention

[0005] This invention provides a device for testing the permeability of SBS modified asphalt concrete, which solves the technical problem that existing testing methods in related technologies are difficult to reflect the impact of actual traffic loads on permeability, and that the permeability performance of asphalt concrete varies greatly under different temperature and humidity conditions.

[0006] This invention provides a device for testing the permeability of SBS modified asphalt concrete, comprising: a base; a support platform, which is annular and disposed on the upper side of the base, with multiple support plates disposed in the middle of the support platform for supporting the asphalt sample, and water guiding holes formed between adjacent support plates; side plates, whose top and bottom are respectively connected to the support platform and the base to form a water storage chamber; a sealing and limiting assembly disposed on the upper side of the support platform, comprising a sealing shell with a bottom opening and a lifting assembly, the lifting assembly being disposed on the base for selectively sealing the sealing shell with the upper side of the support platform to form a test chamber; and a vibration excitation assembly disposed on the sealing shell. Inside, there are components for generating air pressure waves to apply simulated traffic load vibrations to asphalt samples; a data acquisition component, mounted on a support plate, for acquiring the vibration spectrum and acoustic attenuation characteristics of the asphalt samples; a sensing and monitoring component, mounted inside a sealed shell, for acquiring acoustic and thermal signals of the asphalt samples under vibration; an environmental simulation component, mounted inside a sealed shell, for adjusting the temperature and humidity within the test chamber; and a control system, communicatively connected to the vibration excitation component, data acquisition component, sensing and monitoring component, and environmental simulation component, for receiving and processing acoustic and thermal signals, and outputting the permeability parameters of the asphalt samples based on the processing results.

[0007] As a further improvement of the present invention, the top of the support platform is provided with an annular groove along its circumference, and the groove is provided with a plurality of through holes communicating with the water storage cavity.

[0008] As a further improvement of the present invention, the lifting assembly includes a plurality of cylinders, which are spaced apart on three sides of the base, and the top and bottom of the cylinders are fixedly connected to the outer wall of the base and the sealing shell, respectively.

[0009] As a further improvement of the present invention, the vibration excitation assembly includes a plurality of vibrators, the fixed ends of which are fixedly connected to the inner top of the sealing shell; a plurality of pressure plates, each of which corresponds to one of the vibrators, and the pressure plates are fixedly connected to the driving ends of the corresponding vibrators.

[0010] As a further improvement of the present invention, the data acquisition component includes a plurality of flexible piezoelectric films, each of which corresponds to a plurality of support plates. The flexible piezoelectric films are disposed on the top of the corresponding support plates to contact the bottom of the asphalt sample.

[0011] As a further improvement of the present invention, the sensing and monitoring component includes an acoustic monitoring module disposed within the sealed housing for collecting acoustic signals. The acoustic monitoring module includes: a piezoelectric sensor; a thermal field monitoring module disposed within the sealed housing for collecting thermal field signals, the thermal field monitoring module including an infrared thermal imager disposed on the inner wall of the sealed housing for monitoring the temperature field distribution on the surface of the asphalt sample to reflect water infiltration; a temperature sensor disposed on the inner wall of the sealed housing for monitoring the temperature inside the test chamber; and a humidity sensor disposed on the inner wall of the sealed housing for monitoring the humidity inside the test chamber.

[0012] As a further improvement of the present invention, the environmental simulation component includes a temperature control module and a humidity control module.

[0013] As a further improvement of the present invention, the temperature control module includes a ventilation duct disposed on the inner wall of the sealing shell, and the ventilation duct having multiple air outlets; a heating unit disposed on the outer wall of the sealing shell and communicating with the interior of the ventilation duct; and a cooling unit disposed on the outer wall of the sealing shell and communicating with the interior of the ventilation duct.

[0014] As a further improvement of the present invention, the humidity control module includes a flow channel disposed on the inner wall of the sealing shell, and the flow channel is provided with a water inlet and a plurality of water outlets; a dehumidification pipe, which is disposed through the sealing shell, with one end extending into the sealing shell and the other end extending out of the sealing shell.

[0015] As a further improvement of the present invention, the ventilation duct is configured as an annular structure along the inner wall of the sealing shell, and the plurality of air outlets are evenly spaced on the ventilation duct; the flow channel is configured as an annular structure along the inner wall of the sealing shell, and the plurality of water outlets are evenly spaced on the flow channel.

[0016] The beneficial effects of the present invention are as follows: 1. The present invention uses a vibration excitation component to push the air in the sealed chamber to generate pressure waves, which are then applied to the asphalt sample in the form of pulsed impact load. This non-contact pressure application method effectively overcomes the limitations of traditional rigid jacking and can more accurately simulate the instantaneous contact and separation effect of vehicle tires on the road surface at high speed or on bumpy roads, thereby evaluating the permeability performance of asphalt concrete under conditions closer to actual working conditions.

[0017] 2. This invention integrates a vibration excitation component, an environmental simulation component, a data acquisition component, a sensing and monitoring component, and a control system. It can not only conduct tests under different temperature and humidity environments, but also realize the transformation from single index to multi-physics field coupled analysis by collecting and analyzing the vibration response of the sample, the acoustic changes of the internal pores, and the surface temperature field distribution caused by moisture penetration. This allows for a more comprehensive, intuitive, and accurate reflection of the internal structural density and dynamic permeability characteristics of SBS modified asphalt concrete. Attached Figure Description

[0018] Figure 1 is a three-dimensional structural schematic diagram of an SBS modified asphalt concrete permeability testing device according to an embodiment of the present invention; Figure 2 is a front view structural schematic diagram of an SBS modified asphalt concrete permeability testing device according to an embodiment of the present invention; Figure 3 is a top view structural schematic diagram of an SBS modified asphalt concrete permeability testing device according to an embodiment of the present invention; Figure 4 is a side view structural schematic diagram of an SBS modified asphalt concrete permeability testing device according to an embodiment of the present invention; Figure 5 is a three-dimensional structural schematic diagram of a front cross-section of an SBS modified asphalt concrete permeability testing device according to an embodiment of the present invention; Figure 6 is an enlarged view of point A in Figure 5; Figure 7 is a front cross-sectional structural schematic diagram of an SBS modified asphalt concrete permeability testing device according to an embodiment of the present invention; Figure 8 is a side cross-sectional structural schematic diagram of an SBS modified asphalt concrete permeability testing device according to an embodiment of the present invention; Figure 9 is a top cross-sectional structural schematic diagram of an SBS modified asphalt concrete permeability testing device according to an embodiment of the present invention.

[0019] In the diagram: 1. Base; 2. Support platform; 21. Support plate; 22. Groove; 221. Through hole; 3. Side plate; 31. Water storage chamber; 4. Sealing and limiting assembly; 41. Sealing shell; 42. Lifting assembly; 421. Cylinder; 5. Vibration excitation assembly; 51. Vibrator; 52. Pressure plate; 6. Data acquisition assembly; 61. Flexible piezoelectric film; 7. Sensing and monitoring assembly; 71. Acoustic monitoring module; 72. Thermal field monitoring module; 721. Infrared thermal imager; 722. Temperature sensor; 723. Humidity sensor; 8. Environmental simulation assembly; 81. Temperature control module; 811. Ventilation duct; 8111. Air outlet; 812. Heating unit; 813. Cooling unit; 82. Humidity control module; 821. Circulation channel; 8211. Water inlet; 8212. Water outlet; 822. Dehumidification pipe. Detailed Implementation

[0020] The subject matter described herein will now be discussed with reference to exemplary embodiments. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and implement the subject matter described herein, and changes may be made to the function and arrangement of the elements discussed without departing from the scope of this specification. Various processes or components may be omitted, substituted, or added as needed in the examples. Furthermore, features described in some examples may be combined in other examples.

[0021] As shown in Figures 1-9, an SBS modified asphalt concrete permeability testing device includes a base 1, a support platform 2, a side plate 3, a sealing and limiting component 4, a vibration excitation component 5, a data acquisition component 6, a sensing and monitoring component 7, an environmental simulation component 8, and a control system.

[0022] Among them, the base 1 and the support platform 2 mainly serve to support and install, and can provide a carrier for the installation and support of the corresponding components.

[0023] Specifically, as shown in Figures 2, 6, and 9, the support platform 2 has a ring structure and is positioned on the upper side of the base 1. Multiple support plates 21 are fixedly connected to the center of the support platform 2 to support the bottom of the asphalt sample. Water-guiding holes can be formed between adjacent support plates 21, serving as channels for water penetration, allowing water to permeate from the bottom of the asphalt sample and be discharged.

[0024] Furthermore, as shown in Figures 1 and 5, the side plate 3 primarily serves a connecting function. It should be noted that, vertically, both the support platform 2 and the side plate 3 have rectangular cross-sectional shapes. The top and bottom of the side plate 3 are fixedly connected to the support platform 2 and the base 1, respectively, thus forming a water storage chamber 31 between the support platform 2, the side plate 3, and the base 1. The water storage chamber 31 can collect water seeping from the bottom of the asphalt sample. A drainage hole can be provided at the bottom of the side plate 3; during operation, the drainage hole can be sealed with a sealing plug.

[0025] As an alternative embodiment, the support plate 21 can also be designed as a mesh structure.

[0026] As an optional embodiment, as shown in Figures 6 and 9, the top of the support platform 2 has an annular groove 22 along its circumference, and the groove 22 has a plurality of through holes 221 communicating with the water storage chamber 31.

[0027] During use, when vibration is applied to the asphalt test, moisture inside the asphalt sample may overflow from the side onto the support platform 2. The groove 22 is designed to collect the moisture that overflows onto the support platform 2, and the collected moisture can flow into the water storage chamber 31 through the through hole 221 that communicates with the water storage chamber 31 for further collection.

[0028] The support platform 2 can be made of 95% alumina ceramic material, which has high rigidity and corrosion resistance, thus enabling the support platform 2 to work better and improving its reliability and service life. Of course, other suitable materials can also be selected.

[0029] In addition, as shown in Figures 1 and 2, the sealing and limiting component 4 is mainly used to provide a relatively sealed environment for the side view of the asphalt sample to improve the accuracy of its test.

[0030] Specifically, the sealing and limiting assembly 4 is disposed on the upper side of the support platform 2 to form a closed test chamber. The sealing and limiting assembly 4 includes a sealing shell 41 and a lifting assembly 42.

[0031] The sealing shell 41 has a bottom-opening structure, with its open end facing the support platform 2. A lifting assembly 42 is mounted on the base 1 and is used to drive the sealing shell 41 to move vertically up and down, allowing the sealing shell 41 to selectively seal against the upper side of the support platform 2. When the sealing shell 41 descends to seal against the support platform 2, a closed test chamber is formed between the sealing shell 41, the support platform 2, and the asphalt sample; when the sealing shell 41 rises to separate from the support platform 2, the asphalt sample can be placed or removed.

[0032] Furthermore, the lifting assembly 42 includes a plurality of cylinders 421. The plurality of cylinders 421 are spaced apart on three sides of the base 1, and the top and bottom of the cylinders 421 are fixedly connected to the base 1 and the outer wall of the sealing shell 41, respectively. Specifically, the cylinder body of the cylinder 421 is fixedly connected to the base 1, and the telescopic end of the cylinder 421 is fixedly connected to the outer wall of the sealing shell 41.

[0033] During use, the spaced arrangement of multiple cylinders 421 improves the smoothness and reliability of the lifting and lowering of the sealing shell 41. In addition, the multiple cylinders 421 are arranged on three sides of the base 1, so that the asphalt sample can be placed or removed from the other side of the base 1, reducing interference.

[0034] In addition, as shown in Figures 5 and 7, the vibration excitation component 5 is disposed inside the sealed shell 41 to generate air pressure waves to apply vibrations simulating traffic loads to the asphalt sample.

[0035] Specifically, the vibration excitation assembly 5 includes multiple vibrators 51 and multiple pressure plates 52. The fixed end of the vibrator 51 is fixedly connected to the inner top of the sealing shell 41. The driving end of the vibrator 51 extends downward and is fixedly connected to the pressure plate 52. The vibrator 51 can be an electromagnetic vibrator 51 or a pneumatic vibrator 51, capable of generating vibrations with controllable frequency and amplitude. By controlling the operating parameters of the vibrator 51, traffic load vibrations of different frequencies and amplitudes can be simulated, achieving accurate simulation of actual traffic loads.

[0036] When in use, if you want to simulate the pressure of traffic load on the middle of the road surface, start the vibrator 51 directly above the asphalt sample. The vibrator 51 drives the corresponding pressure plate 52 to vibrate. Since the test chamber is in a relatively sealed state, the pressure plate 52 will push the air to move and generate air pressure waves, which will then be transmitted to the asphalt sample.

[0037] To simulate the pressure of traffic load on the edge of the road surface, the vibrator 51 above the side of the asphalt sample can be activated. The vibrator 51 drives the corresponding pressure plate 52 to vibrate. Since the test chamber is in a relatively sealed state, the pressure plate 52 will push the air to move and generate air pressure waves, which will then be transmitted to the asphalt sample.

[0038] It should be noted that when a vehicle rolls over a road surface, the tire is flexible, and there are instantaneous contact and separation, especially on high-speed or bumpy roads. The road surface is subjected to pulsed impact loads, rather than continuous rigid pushing. Therefore, different traffic loads can be applied to asphalt samples without contacting the asphalt itself, allowing for a more accurate simulation of the pressure exerted on the road surface by traffic loads compared to rigid pressure.

[0039] In addition, as shown in Figures 5, 6 and 9, the data acquisition component 6 is mounted on the support plate 21 and is used to acquire the vibration spectrum and sound wave attenuation characteristics of the asphalt sample.

[0040] The data acquisition component 6 includes multiple flexible piezoelectric films 61. Each flexible piezoelectric film 61 is correspondingly positioned to one of multiple support plates 21. The flexible piezoelectric film 61 is fixedly connected to the top of its corresponding support plate 21, and when the asphalt sample is placed on the support plate 21, the flexible piezoelectric film 61 contacts the bottom of the asphalt sample.

[0041] The flexible piezoelectric film 61 converts the vibration signal of the asphalt sample into an electrical signal. By analyzing the vibration spectrum and sound wave attenuation characteristics, the internal structure and density of the asphalt sample can be evaluated, thus reflecting its permeability. The flexible piezoelectric film 61 features high flexibility and sensitivity, accurately capturing minute vibration signals from the asphalt sample. The flexible piezoelectric film 61 can be made of PVDF-PTFE material. Of course, other suitable materials can also be used.

[0042] Furthermore, as shown in Figures 5 and 8, the sensing and monitoring component 7 is installed inside the sealed housing 41 to collect acoustic and thermal signals of the asphalt sample under vibration.

[0043] The sensing and monitoring component 7 includes an acoustic monitoring module 71 and a thermal field monitoring module 72. The acoustic monitoring module 71 is used to acquire acoustic signals. The acoustic monitoring module 71 includes a piezoelectric sensor. The piezoelectric sensor is fixedly connected to the inner wall of the sealed housing 41 and can acquire the acoustic signals generated by the asphalt sample during vibration. Changes in the acoustic signal can reflect changes in the internal pore structure of the asphalt sample, and thus reflect the water permeation. The piezoelectric sensor can be made of a PVDF-PTFE composite piezoelectric film, or other suitable materials can be selected.

[0044] As an optional embodiment, multiple piezoelectric sensors can be set up, with multiple piezoelectric sensors covering the inner wall of the sealing shell 41, so that the acoustic signals of the asphalt sample can be collected more comprehensively.

[0045] The thermal field monitoring module 72 is used to collect thermal field signals. The thermal field monitoring module 72 includes an infrared thermal imager 721, a temperature sensor 722, and a humidity sensor 723.

[0046] The infrared thermal imager 721 is fixedly connected to the inner wall of the sealed housing 41 and is used to monitor the temperature field distribution on the surface of the asphalt sample. When water permeates through the asphalt sample, it causes a change in the surface temperature of the sample. The infrared thermal imager 721 can intuitively capture this temperature change, thereby reflecting the water permeation situation.

[0047] Temperature sensor 722 is fixedly connected to the inner wall of the sealed housing 41 and is used to monitor the temperature inside the test chamber. Temperature sensor 722 can be a thermistor, or other suitable sensors.

[0048] The humidity sensor 723 is fixedly connected to the inner wall of the sealed housing 41 and is used to monitor the humidity in the test chamber. The humidity sensor 723 can be an optical humidity sensor, which has high accuracy and is not easily affected by electromagnetic interference.

[0049] In addition, as shown in Figures 2-5 and 7, the environmental simulation component 8 is set inside the sealed shell 41 to adjust the temperature and humidity inside the test chamber and simulate permeability tests under different environmental conditions.

[0050] The environmental simulation component 8 includes a temperature control module 81 and a humidity control module 82. The temperature control module 81 includes a ventilation duct 811, a heating unit 812, and a cooling unit 813.

[0051] The ventilation duct 811 is fixedly connected to the inner wall of the sealing shell 41 and is arranged in a ring structure along the inner wall of the sealing shell 41. The ventilation duct 811 has multiple air outlets 8111, which are evenly distributed on the ventilation duct 811 to ensure that the airflow can be more evenly distributed in the test chamber.

[0052] The heating unit 812 is fixedly connected to the outer wall of the sealed housing 41 and communicates with the interior of the ventilation duct 811 to generate hot air. The cooling unit 813 is fixedly connected to the outer wall of the sealed housing 41 and communicates with the interior of the ventilation duct 811 to generate cold air. By controlling the operation of the heating unit 812 and the cooling unit 813, the temperature inside the test chamber can be precisely adjusted.

[0053] It should be noted that the heating unit 812 and the cooling unit 813 can respectively adopt a semiconducting heating element and a semiconductor cooling element, which are existing technologies. The supporting parts and equipment and working principle are not shown in detail.

[0054] As an optional embodiment, multiple heating units 812 and cooling units 813 can be provided and evenly distributed along the ventilation duct 811, so that the airflow temperature ejected from multiple air outlets 8111 can be more uniform.

[0055] Additionally, as shown in Figures 4 and 7, the humidity control module 82 includes a flow channel 821 and a dehumidification pipe 822.

[0056] The flow channel 821 is fixedly connected to the inner wall of the sealing shell 41 and is arranged in a ring shape along the inner wall of the sealing shell 41. The flow channel 821 has an inlet 8211 and multiple outlets 8212. The inlet 8211 is connected to an external water source, and the multiple outlets 8212 are evenly spaced along the flow channel 821. By introducing water vapor or water mist into the flow channel 821, the humidity in the test chamber can be increased. Atomizing nozzles can be installed at the outlets 8212.

[0057] A dehumidification pipe 822 is installed through the sealing shell 41, with one end extending into the sealing shell 41 and the other end extending out to the outside of the sealing shell 41 and connecting to the pump body. The dehumidification pipe 822 is used to expel moisture from the test chamber and reduce the humidity inside the chamber. By controlling the water inlet 8211 and the dehumidification capacity of the dehumidification pipe 822, the humidity inside the test chamber can be better regulated.

[0058] Furthermore, the control system is communicatively connected to the vibration excitation component 5, the data acquisition component 6, the sensing and monitoring component 7, and the environmental simulation component 8 to receive and process acoustic signals and thermal field signals, and output the permeability parameters of the asphalt sample based on the processing results.

[0059] The control system includes a data acquisition module, a signal processing module, a parameter calculation module, and a control module.

[0060] The data acquisition module is used to acquire various signals output by the data acquisition component 6 and the sensing and monitoring component 7, including vibration spectrum signals, sound wave attenuation signals, acoustic signals, temperature signals, and humidity signals.

[0061] The signal processing module performs filtering, amplification, analog-to-digital conversion, and other processing on the acquired signals to extract useful feature information.

[0062] The parameter calculation module calculates the permeability parameters of the asphalt sample based on the processed signal. These parameters may include the permeability coefficient, permeability rate, and acoustic attenuation coefficient. The calculation method can employ existing permeability assessment algorithms, combined with comprehensive analysis of the multi-parameter data collected in this invention.

[0063] The control module is used to control the vibration parameters of the vibration excitation component 5, the temperature and humidity parameters of the environmental simulation component 8, and the lifting and lowering movement of the sealing limit component 4.

[0064] The control system can be implemented using an industrial computer or a programmable logic controller (PLC), and has a good human-machine interface and data storage function.

[0065] The working principle of this invention is as follows: First, the sealing shell 41 is raised by the lifting assembly 42, and the asphalt sample to be tested is placed on the support plate 21, with the bottom of the asphalt sample in contact with the flexible piezoelectric film 61. Then, the sealing shell 41 is lowered by the lifting assembly 42, so that it seals with the support platform 2 to form a closed test chamber.

[0066] Then, the temperature and humidity inside the test chamber are set to preset values ​​using the environmental simulation component 8, and monitored and controlled in a closed loop using the temperature sensor 722 and the humidity sensor 723.

[0067] Subsequently, vibration is generated by the vibration excitation component 5 to simulate traffic load. The vibration is transmitted to the asphalt sample through the pressure plate 52 and air, causing the asphalt sample to produce a vibration response.

[0068] During the vibration process, data acquisition component 6 collects the vibration spectrum and acoustic attenuation characteristics of the asphalt sample; sensing and monitoring component 7 collects acoustic signals and thermal field signals. Infrared thermal imager 721 monitors the temperature field distribution on the surface of the asphalt sample, visually reflecting the water penetration.

[0069] Finally, the control system receives and processes all the acquired signals, calculates the permeability parameters of the asphalt sample, and outputs the test results.

[0070] This invention enables the following tests: testing permeability under simulated traffic load vibration conditions, which is closer to the actual use environment; testing permeability under different temperature and humidity conditions, realizing multi-factor coupled testing; and improving the accuracy of permeability assessment through multi-parameter comprehensive analysis of vibration spectrum, sound wave attenuation, acoustic signal and thermal field signal.

[0071] It should be noted that the dimensions and models of the above-mentioned components can be selected according to the actual working conditions.

[0072] The embodiments of this example have been described above. However, this example is not limited to the specific implementation methods described above. The specific implementation methods described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms based on the guidance of this example, and all of them are within the protection scope of this example.

Claims

1. A device for testing the permeability of SBS modified asphalt concrete, characterized in that, include: Base (1); support platform (2), which is a ring structure and is set on the upper side of the base (1), with multiple support plates (21) in the middle of the support platform (2), the multiple support plates (21) are used to support the asphalt sample, and water guide holes are formed between two adjacent support plates (21); side plate (3), the top and bottom of which are connected to the support platform (2) and the base (1) respectively to form a water storage chamber (31); sealing and limiting assembly (4), which is set on the upper side of the support platform (2), including a sealing shell (41) with a bottom opening and a lifting assembly (42), the lifting assembly (42) is set on the base (1) to drive the sealing shell (41) to selectively seal and cooperate with the upper side of the support platform (2) to form a test chamber; vibration excitation assembly (5), which is set on the sealing platform (1) Inside the shell (41), an air pressure wave is generated to apply vibration simulating traffic load to the asphalt sample; a data acquisition component (6), which is set on the support plate (21), is used to acquire the vibration spectrum and sound wave attenuation characteristics of the asphalt sample; a sensing and monitoring component (7), which is set inside the sealed shell (41), is used to acquire the acoustic signal and thermal field signal of the asphalt sample under vibration; an environmental simulation component (8), which is set inside the sealed shell (41), is used to adjust the temperature and humidity inside the test chamber; and a control system, which is communicatively connected to the vibration excitation component (5), the data acquisition component (6), the sensing and monitoring component (7) and the environmental simulation component (8), is used to receive and process the acoustic signal and thermal field signal, and output the permeability parameters of the asphalt sample based on the processing results.

2. The SBS modified asphalt concrete permeability testing equipment according to claim 1, characterized in that, The top of the support platform (2) has an annular groove (22) along its circumference, and the groove (22) has multiple through holes (221) communicating with the water storage chamber (31).

3. The SBS modified asphalt concrete permeability testing equipment according to claim 1, characterized in that, The lifting assembly (42) includes a plurality of cylinders (421), which are spaced apart on three sides of the base (1). The top and bottom of the cylinders (421) are fixedly connected to the outer wall of the base (1) and the sealing shell (41), respectively.

4. The SBS modified asphalt concrete permeability testing equipment according to claim 1, characterized in that, The vibration excitation assembly (5) includes: multiple vibrators (51), the fixed ends of which are fixedly connected to the inner top of the sealing shell (41); multiple pressure plates (52), each of which corresponds to one of the multiple vibrators (51), and the pressure plates (52) are fixedly connected to the driving end of the corresponding vibrator (51).

5. The SBS modified asphalt concrete permeability testing device according to claim 1, characterized in that, The data acquisition component (6) includes multiple flexible piezoelectric films (61), each of which corresponds to a support plate (21). The flexible piezoelectric films (61) are disposed on the top of the corresponding support plate (21) to contact the bottom of the asphalt sample.

6. The SBS modified asphalt concrete permeability testing device according to claim 1, characterized in that, The sensing and monitoring component (7) includes: an acoustic monitoring module (71), which is located inside the sealed shell (41) for collecting acoustic signals. The acoustic monitoring module (71) includes: a piezoelectric sensor; and a thermal field monitoring module (72), which is located inside the sealed shell (41) for collecting thermal field signals. The thermal field monitoring module (72) includes: an infrared thermal imager (721), which is located on the inner wall of the sealed shell (41) for monitoring the temperature field distribution on the surface of the asphalt sample to reflect the water infiltration situation; a temperature sensor (722), which is located on the inner wall of the sealed shell (41) for monitoring the temperature inside the test chamber; and a humidity sensor (723), which is located on the inner wall of the sealed shell (41) for monitoring the humidity inside the test chamber.

7. The SBS modified asphalt concrete permeability testing device according to claim 1, characterized in that, The environmental simulation component (8) includes a temperature control module (81) and a humidity control module (82).

8. The SBS modified asphalt concrete permeability testing device according to claim 7, characterized in that, The temperature control module (81) includes: a ventilation duct (811) disposed on the inner wall of the sealing shell (41), and the ventilation duct (811) having multiple air outlets (8111); a heating unit (812) disposed on the outer wall of the sealing shell (41) and communicating with the interior of the ventilation duct (811); and a cooling unit (813) disposed on the outer wall of the sealing shell (41) and communicating with the interior of the ventilation duct (811).

9. The SBS modified asphalt concrete permeability testing device according to claim 8, characterized in that, The humidity control module (82) includes: a flow channel (821) disposed on the inner wall of the sealing shell (41), and the flow channel (821) is provided with an inlet (8211) and a plurality of outlets (8212); a dehumidification pipe (822) which is disposed through the sealing shell (41), with one end extending into the sealing shell (41) and the other end extending out of the sealing shell (41).

10. The SBS modified asphalt concrete permeability testing device according to claim 9, characterized in that, The ventilation duct (811) is arranged in an annular structure along the inner wall of the sealing shell (41), and the plurality of air outlets (8111) are evenly spaced on the ventilation duct (811); the flow channel (821) is arranged in an annular structure along the inner wall of the sealing shell (41), and the plurality of water outlets (8212) are evenly spaced on the flow channel (821).

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