Multi-condition coupling asphalt aging simulation experiment device and experiment method

Abstract

The invention discloses a multi-condition coupling asphalt aging simulation experiment device and an experiment method, and belongs to the technical field of aging simulation experiments. A door body is arranged on the front side face of the machine box and driven by an electric-hydraulic push rod to be opened and closed, the interior of the machine box is divided into an experiment area and a control area through a horizontal partition plate, the interior space of the experiment area is divided into a plurality of independent spaces through partition plates, a conveying belt is installed below the independent spaces, and electric lifting tables are installed on the left side and the right side in the experiment area. An electric push plate is installed on the table top of the electric lifting table, the pushing direction of the electric push plate faces the conveying belt, atomizing nozzles, temperature control resistors, temperature and humidity sensors and ultraviolet lamps are installed in the independent spaces, a ventilation opening is formed in the rear side face of each independent space, and a fan is installed at each ventilation opening. According to the invention, the experiment device is combined with a specific experiment method, so that a simulation experiment result with relatively high accuracy can be obtained, and prediction based on the experiment result is more accurate.

Description

Technical Field

[0001] The invention belongs to the technical field of aging simulation experiments, and relates to a multi-condition coupling asphalt aging simulation experimental device and an experimental method. Background Art

[0002] Asphalt is a dark brown complex mixture of hydrocarbons of different molecular weights and their non-metallic derivatives. It is a kind of high-viscosity organic liquid, mostly in the form of liquid or semi-solid petroleum. Asphalt is mainly used in industries such as coatings, plastics, rubber, and pavement.

[0003] Asphalt aging is mainly affected by the combined effects of time, temperature, humidity, ultraviolet intensity and air. As asphalt ages, products made with it as raw material or paved roads will also be affected, causing them to fail to function normally. Therefore, simulation experiments on asphalt aging can be carried out. The aging of asphalt during actual use can be inferred based on the results of the simulation experiments, so as to understand the aging of asphalt in advance, make preparations in advance or plan the service life of the product according to the aging of the asphalt, and avoid asphalt aging from having a major impact on related products or roads, resulting in safety risks and major economic losses.

[0004] The accuracy of the results of asphalt aging simulation experiments directly affects the accuracy of the prediction results. The higher the accuracy of the prediction results, the more accurate and targeted the measures prepared in advance can be. Therefore, it is of great significance to improve the accuracy of the results of asphalt aging simulation experiments.

[0005] Therefore, it is necessary to provide a multi-condition coupled asphalt aging simulation experimental device and experimental method to reduce the error between the simulation experimental results and the actual situation and improve the accuracy of the simulation experimental results, thereby providing reliable data for predicting the actual asphalt aging conditions and improving the accuracy of the prediction results. Summary of the invention

[0006] In order to overcome the problems in the background technology, the present invention collects actual statistical data and converts the simulation experiment parameters based on the actual data, so that during the simulation experiment, the simulation experiment parameters are closer to the actual situation, thereby making the simulation experiment results closer to the actual situation, and making the simulation experiment results more accurate and reliable.

[0007] In order to achieve the above object, the present invention is implemented by the following technical solutions:

[0008] On the one hand, the present invention proposes an asphalt aging simulation experimental device, which includes a chassis 1, the front side of the chassis 1 is a door body 2, and the door body 2 is opened and closed by an electro-hydraulic push rod 3. The interior of the chassis 1 is divided into an experimental area and a control area by a horizontal partition, and the internal space of the experimental area is divided into a plurality of independent spaces arranged in a horizontal direction and open at the bottom by a partition 4. A conveyor belt 5 is installed below the independent space, and an electric lifting platform 6 is installed on the left and right sides of the experimental area. The table top of the electric lifting platform 6 is in contact with and flush with the conveyor belt 5. An electric push plate 7 is installed on the table top of the electric lifting platform 6, and the pushing direction of the electric push plate 7 is toward the conveyor belt 5. Atomizing nozzles 8, temperature control resistors 9, temperature and humidity sensors 10, and ultraviolet lamps 11 are installed in the independent spaces, and a vent is provided on the rear side of each of the independent spaces. A fan 12 is installed, and the fan 12 is communicatively connected with the humidity control system, the temperature control resistor 9 is communicatively connected with the temperature control system, the temperature and humidity sensor 10 is communicatively connected with the master control system, the ultraviolet lamp 11 is communicatively connected with the ultraviolet light control system, the atomizing nozzle 8 is respectively connected with the water source and the cold source, and the water source and the cold source are respectively communicatively connected with the master control system, a gravity sensor 13 is also installed on the surface of the electric lifting platform 6, and the gravity sensor 13 is communicatively connected with the master control system, the conveyor belt 5, the electric lifting platform 6, and the electric push plate 7 are all communicatively connected with the master control system, and the master control system is respectively communicatively connected with the temperature control system, the humidity control system, and the ultraviolet light control system, the conveyor belt 5 drives the asphalt to move, passes through different independent spaces, and causes the asphalt to age under different environmental conditions, and the electric lifting platform 6 transports the asphalt to the conveyor belt 5 at different heights.

[0009] Preferably, the conveyor belt 5 includes a first conveyor belt 501 and a second conveyor belt 502. The first conveyor belt 501 is installed in the middle position of the experimental area, and the second conveyor belt 502 is installed at the bottom of the experimental area. The number of independent spaces above the first conveyor belt 501 is 6, and the number of independent spaces below the first conveyor belt 501 is 6.

[0010] Preferably, the atomizing nozzle 8 and the ultraviolet lamp 11 are installed on the top surface of the independent space, and the temperature-controlling resistor 9 is installed on the bottom of the partition 4 .

[0011] Preferably, the asphalt aging simulation experimental device further comprises a slide rail 14 , which is installed inside the experimental area and located at the top of the independent space, and the partition 4 is installed on the slide rail 14 .

[0012] Preferably, the slide rail 14 is marked with scale.

[0013] Preferably, the control area is provided with a main control room 15, a temperature control room 16, a humidity control room 17, and an ultraviolet light control room 18. The main control system is installed in the main control room 15, the temperature control system is installed in the temperature control room 16, the humidity control system is installed in the humidity control room 17, and the ultraviolet light control system is installed in the ultraviolet light control room 18. A small refrigerator 19 is arranged in the temperature control room 16, and a small humidifier 20 is arranged in the humidity control room 17. The atomizing nozzle 8 is respectively connected to the small refrigerator 16 and the small humidifier 20, the temperature control system is communicatively connected to the small refrigerator 16, and the humidity control system is communicatively connected to the small humidifier 20.

[0014] Preferably, universal wheels 21 are installed at the bottom of the chassis 1 .

[0015] Another aspect of the present invention provides a method for conducting an asphalt aging test using the above-mentioned simulation test device, the test method comprising the following steps:

[0016] (1) Collecting meteorological data from the Meteorological Bureau through the master control system, wherein the meteorological data includes temperature, humidity, and ultraviolet radiation data;

[0017] (2) dividing the meteorological data collected in step (1) into meteorological data in different time periods according to different time periods, calculating the average values ​​of the temperature, humidity, and ultraviolet radiation data in a certain time period, and converting the average values ​​to obtain simulation experiment parameters in different time periods;

[0018] (3) In step (2), different time periods correspond to different independent spaces. After the master control system converts actual meteorological data into simulation experiment parameters, the signals are transmitted to the temperature control system, the humidity control system, and the ultraviolet light control system respectively. The temperature control system controls the operation of the atomizing nozzle 8 and the temperature control resistor 9 according to the received signals to adjust the temperature in different independent spaces to the simulation experiment temperature. The humidity control system controls the operation of the atomizing nozzle 8 and the fan 12 according to the received signals to adjust the humidity in different independent spaces to the simulation experiment humidity. The ultraviolet light control system controls the ultraviolet lamp 11 according to the received signals to adjust the ultraviolet intensity in different independent spaces to the simulation experiment intensity. The temperature and humidity sensor 10 detects the temperature and humidity conditions in the independent space in real time and transmits the signal to the master control system. The master control system compares the received signal with the simulation experiment temperature and the simulation experiment humidity. When a difference is found, the master control system sends a signal to the temperature control system and the humidity control system. The temperature control system controls the operation of the atomizing nozzle 8, the temperature control resistor 9, and the fan 12 to adjust the temperature and humidity conditions in the independent space to the simulation experiment temperature and the simulation experiment humidity. The conveyor belt 5 transports asphalt through different independent spaces and ages it under different simulation experiment parameter conditions.

[0019] Preferably, the actual meteorological data is converted into simulation experiment parameters by the following formula:

[0020] Where P is the simulated UV intensity, in kw / m 2 , W is the average value of actual ultraviolet radiation during the Δt1 period, in kw / m 2 , Δt1 is the actual time period of ultraviolet radiation divided according to the experimental design, in h.

[0021] Δh=t-Δt2, where Δh is the time increase value under the same aging degree, unit is h, t is the actual time period divided by the experimental design, unit is h, and Δt2 is the experimental time period of the experimental design, unit is h.

[0022] ΔT=k·Δh, where k is the correlation coefficient (k=0.23), ΔT is the equivalent temperature, in °C; k is related to the specific aging material and is obtained based on creep experiments.

[0023] T'=T+ΔT, where T' is the simulated experimental temperature within Δt2, in °C, and T is the actual average temperature within t, in °C.

[0024] RH'=RH, where RH is the actual average humidity within t, in %RH, and RH' is the simulated experimental humidity within Δt2, in %RH.

[0025] Beneficial effects of the present invention:

[0026] 1. During the conversion process of the present invention, the relationship between ΔT and Δh is derived based on the free volume theory of asphalt viscosity. During the conversion process, a targeted correlation coefficient is introduced, so that in the process of converting from the actual average value to the simulated experimental value, the conversion method is more targeted, so that the conversion result is more consistent with the true value, effectively improving the accuracy of the conversion result, so that the simulation experiment parameters have higher accuracy.

[0027] 2. The present invention divides the internal experimental area of ​​the chassis into multiple independent spaces through partitions. The environmental conditions in different independent spaces correspond to the actual meteorological conditions in different time periods, making the simulation experiment time division more precise.

[0028] 3. The present invention reduces the frequency of changes in environmental conditions during the simulation process by averaging the actual meteorological data within a certain time period, which is beneficial to reducing the difficulty of simulation. Although averaging will produce certain errors, the present invention divides the meteorological data into meteorological data within different time periods according to different times. The time corresponding to the meteorological data within a certain time period is relatively close, the meteorological data itself has small volatility, and the error caused by averaging is also small, which has little impact on the accuracy of the simulation experiment parameters of the present invention.

[0029] 4. The present invention divides the internal experimental area of ​​the chassis into multiple independent spaces through partitions, which can not only perform time-varying condition aging on a single asphalt sample, but also perform aging experimental research on multiple asphalt samples at the same time when necessary, and has a variety of uses. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the front view structure of the experimental device of the present invention;

[0031] Figure 2 It is a rear view structural schematic diagram of the experimental device of the present invention;

[0032] Figure 3 It is a schematic diagram of the top view of the structure of the experimental device of the present invention;

[0033] Figure 4 It is a side view structural schematic diagram of the present invention;

[0034] Figure 5 This is an enlarged view of the experimental area in the chassis of the present invention;

[0035] Figure 6 This is a flow chart of the control program of the present invention;

[0036] Figure 7 This is a schematic diagram of the independent space numbering of the experimental device of the present invention;

[0037] Figure 8 This is a schematic diagram of simulating ultraviolet intensity P according to an embodiment of the present invention;

[0038] Fig. 9 This is a schematic diagram of the simulated experimental temperature T' of an embodiment of the present invention;

[0039] Fig.10 Schematic diagram of humidity RH' in a simulation experiment according to an embodiment of the present invention.

[0040] 1-chassis, 2-door, 3-electro-hydraulic push rod, 4-partition, 5-conveyor belt, 501-first conveyor belt, 502-second conveyor belt, 6-electric lifting platform, 7-electric push plate, 8-atomizing nozzle, 9-temperature control resistor, 10-temperature and humidity sensor, 11-ultraviolet lamp, 12-fan, 13-gravity sensor, 14-slide rail, 15-master control room, 16-temperature control room, 17-humidity control room, 18-ultraviolet light control room, 19-small refrigerator, 20-small humidifier, 21-universal wheel. DETAILED DESCRIPTION

[0041] The present invention is further described in detail below in conjunction with specific embodiments.

[0042] like Figure 1-5As shown, the asphalt aging simulation experimental device includes a chassis 1, the front side of the chassis 1 is a door body 2, the door body 2 is opened and closed by an electro-hydraulic push rod 3, the interior of the chassis 1 is divided into an experimental area and a control area by a horizontal partition, the internal space of the experimental area is divided into a number of independent spaces arranged in a horizontal direction and open at the bottom by a partition 4, a conveyor belt 5 is installed below the independent space, an electric lifting platform 6 is installed on the left and right sides of the experimental area, the table top of the electric lifting platform 6 is in contact with and flush with the conveyor belt 5, an electric push plate 7 is installed on the table top of the electric lifting platform 6, and the pushing direction of the electric push plate 7 is toward the conveyor belt 5, an atomizing nozzle 8, a temperature control resistor 9, a temperature and humidity sensor 10, and an ultraviolet lamp 11 are installed in the independent space, and a vent is provided on the rear side of each of the independent spaces, and a fan 12 is installed at the vent. The fan 12 is communicatively connected to the humidity control system, the temperature control resistor 9 is communicatively connected to the temperature control system, the temperature and humidity sensor 10 is communicatively connected to the master control system, the ultraviolet lamp 11 is communicatively connected to the ultraviolet light control system, the atomizing nozzle 8 is respectively connected to the water source and the cold source, and the water source and the cold source are respectively communicatively connected to the master control system. A gravity sensor 13 is also installed on the surface of the electric lifting platform 6, and the gravity sensor 13 is communicatively connected to the master control system. The conveyor belt 5, the electric lifting platform 6, and the electric push plate 7 are all communicatively connected to the master control system, and the master control system is respectively communicatively connected to the temperature control system, the humidity control system, and the ultraviolet light control system. The conveyor belt 5 drives the asphalt to move, passes through different independent spaces, and causes the asphalt to age under different environmental conditions. The electric lifting platform 6 transports the asphalt to the conveyor belt 5 at different heights.

[0043] When it is necessary to conduct an asphalt aging experiment, first control the electro-hydraulic push rod 3 to extend and push the door body 2 open, then place the asphalt sample on the conveyor belt 5, control the electro-hydraulic push rod 3 to shorten and close the door body 2, and then turn on the power supplies of the master control system, temperature control system, humidity control system, ultraviolet light control system, conveyor belt 5, electric lifting platform 6, electric push plate 7, water source, cold source, temperature control resistor 9, temperature and humidity sensor 10, ultraviolet lamp 11, fan 12, and gravity sensor 13. The master control system converts the actually collected meteorological data into simulation experiment parameters through the built-in program, and sends signals to the temperature control system, humidity control system, The ultraviolet light control system and the temperature control system control the operation of the cold source and the temperature control resistor 9 according to the received signal. When the temperature needs to be raised, the temperature control system controls the temperature control resistor 9 to heat the independent space. When the temperature needs to be lowered, the temperature control system controls the cold source to deliver cold air to the atomizing nozzle 8 and controls the flow rate of cold air delivered by the cold source. The atomizing nozzle 8 sprays cold air to cool the independent space. Finally, the temperature condition in the independent space is adjusted to the simulated experimental parameter condition. The humidity control system controls the water source to deliver water to the atomizing nozzle 8 according to the received signal. The atomizing nozzle 8 sprays water to increase the humidity in the independent space. If the humidity in the independent space needs to be lowered, the temperature in the independent space is increased. Humidity, the humidity control system controls the fan 12 to run, and the water mist in the independent space is extracted and discharged outside the chassis 1, so that the humidity in the independent space is adjusted to the simulated experimental parameter conditions. The cold source delivers cold air to the atomizing nozzle 8, and the water source delivers water to the atomizing nozzle 8. The atomizing nozzle 8 can spray cold air and water at the same time without affecting its normal operation. The ultraviolet light control system controls the operation of the ultraviolet lamp 11 according to the received signal to adjust the ultraviolet intensity in the independent space to the simulated experimental parameter conditions. Then, the main control system controls the conveyor belt 5 to run at a preset speed according to the preset program. Since the distance between the two partitions 4 is determined during the experiment, At the same time, the time that asphalt needs to be aged in an independent space is also certain. The speed at which the conveyor belt 5 drives the asphalt to move can be obtained by dividing the distance between the two partitions 4 by the aging time that the asphalt needs to be aged in the corresponding independent space. After the conveyor belt 5 is running, it drives the asphalt to move, so that the asphalt can pass through different independent spaces. Since different independent spaces correspond to different time periods, the actual meteorological data collected in different time periods are different. Therefore, the specific simulation experimental parameters in different independent spaces also have certain differences, and the aging environmental conditions are also different. Therefore, the aging process of asphalt under different environmental conditions can be simulated.

[0044] If it is necessary to carry out aging experiments on multiple asphalt samples at the same time, it is only necessary to place the multiple asphalt samples at different positions on the conveyor belt 5 so that different asphalt samples correspond to different independent spatial positions. During the aging process, the conveyor belt 5 is not turned on and is kept in a stationary state.

[0045] In order for the conveyor belt 5 to normally drive the asphalt to move and pass through different independent spaces, a certain space needs to be reserved between the partition 4 and the conveyor belt 5 for the asphalt to pass through. During the experiment, the experimental area in the chassis 1 is in a closed state, and the air flow is low. Therefore, the air in different independent spaces is not easy to flow to each other, causing mutual interference of environmental conditions.

[0046] Multiple conveyor belts 5 can be set in the experimental area, such as Figure 1 As shown, as an embodiment of the present invention, two conveyor belts 5 are set in the experimental area, namely a first conveyor belt 501 and a second conveyor belt 502. The first conveyor belt 501 is installed in the middle position of the experimental area, and the second conveyor belt 502 is installed at the bottom of the experimental area. The number of independent spaces above the first conveyor belt 501 is 6, and the number of independent spaces below the first conveyor belt 501 is 6.

[0047] by Figure 1 For example, during the aging experiment, the first conveyor belt 501 transfers asphalt from the left to the right. Then the asphalt starts from the leftmost independent space, passes through all the independent spaces above the first conveyor belt 501, and reaches the rightmost independent space. Then the first conveyor belt 501 continues to drive the asphalt to move, and finally transfers the asphalt to the electric lifting platform 6 on the right. The asphalt itself has gravity. After it is transferred to the electric lifting platform 6, the gravity sensor 13 senses the gravity and transmits the signal to the master control system. After receiving the signal, the master control system controls the electric lifting platform 6 to be lowered to the position of the second conveyor belt 502. Then, the master control system controls the electric pusher 6 to move. The plate 7 pushes the asphalt to the second conveyor belt 502. The second conveyor belt 502 then transports the asphalt from the rightmost independent space under the first conveyor belt 501 to the leftmost independent space. After the asphalt passes through all the independent spaces under the first conveyor belt 501, the second conveyor belt 502 will transport the asphalt to the electric lifting platform 6 on the left. After the gravity sensor 13 senses the gravity of the asphalt, it transmits the signal to the main control system. The main control system controls the electric lifting platform 6 on the left to rise. When it reaches the position of the first conveyor belt 501, the electric push plate 7 pushes the asphalt to the first conveyor belt 501 again. Repeating the above process can form a cycle.

[0048] The atomizing nozzle 8 and the ultraviolet lamp 11 are installed on the top surface of the independent space, and the temperature control resistor 9 is installed on the bottom of the partition 4.

[0049] The asphalt aging simulation test device further includes a slide rail 14 , which is installed inside the test area and located at the top of the independent space, and the partition 4 is installed on the slide rail 14 .

[0050] By sliding the slide rail 14, the partition 4 can be driven to move along the slide rail 14, so that the distance between any two partitions 4 can be changed. Since the aging time of asphalt in different independent spaces may be different, and it is cumbersome to frequently adjust the running speed of the conveyor belt 5, the distance between the two partitions 4 can be calculated according to the running speed of the conveyor belt 5 and the aging time of asphalt in different independent spaces, and then the distance is changed by moving the partition 4, so that the asphalt can be aged for different times in different independent spaces.

[0051] The slide rail 14 is marked with scales to facilitate the staff to determine whether the distance between the two partitions 4 meets the requirements.

[0052] The control area is provided with a main control room 15, a temperature control room 16, a humidity control room 17, and an ultraviolet light control room 18. The main control system is installed in the main control room 15, the temperature control system is installed in the temperature control room 16, the humidity control system is installed in the humidity control room 17, and the ultraviolet light control system is installed in the ultraviolet light control room 18. A small refrigerator 19 is arranged in the temperature control room 16, and a small humidifier 20 is arranged in the humidity control room 17. The atomizing nozzle 8 is respectively connected with the small refrigerator 16 and the small humidifier 20, the temperature control system is connected to the small refrigerator 16 for communication, and the humidity control system is connected to the small humidifier 20 for communication.

[0053] The small humidifier 20 provides a water source for the atomizing nozzle 8 , and the small refrigerator 16 provides a cold source for the atomizing nozzle 8 .

[0054] Universal wheels 21 are installed at the bottom of the chassis 1 to facilitate the movement of the chassis 1.

[0055] Example

[0056] The above experimental device was used to conduct experiments. In order to facilitate recording and distinguishing independent spaces, in this embodiment, Figure 7 As shown, the independent spaces are marked from I to XII, with a total of 12 independent spaces. Taking the simulation experiment of asphalt aging for one day as an example, the temperature and humidity data actually collected for one day are divided into 12 time periods, each time period is 2 hours, then t = 2 hours, and the ultraviolet radiation data actually collected for one day are divided into 24 time periods, each time period is 1 hour, then Δt1 = 1 hour. Since multiple ultraviolet lamps 11 can be installed in the same independent space, and the irradiation ranges of ultraviolet lamps 11 of different models are different, in the same independent space, ultraviolet intensity parameters simulated in the same independent space can be distinguished by selecting ultraviolet lamps 11 with different irradiation ranges. t and Δt1 are obtained after dividing the time periods according to the experimental design of the asphalt aging simulation experiment in this embodiment, and can be calculated according to the formula The simulated ultraviolet intensity P in the corresponding time period is calculated. For example, the independent space marked as I corresponds to the actual time period of 7:00-9:00, and two ultraviolet lamps 11 are installed in the independent space I in sequence according to the asphalt transportation direction, and the two ultraviolet lamps 11 have their own fixed irradiation ranges. In the asphalt transportation process, it is first irradiated by the left ultraviolet lamp 11 and then by the right ultraviolet lamp 11. For example, the simulated ultraviolet intensity P of the left ultraviolet lamp 11 can correspond to the actual average ultraviolet irradiation amount W from 7:00 to 8:00, and the simulated ultraviolet intensity P of the right ultraviolet lamp 11 can correspond to the actual average ultraviolet irradiation amount W from 8:00 to 9:00. After conversion, the simulated ultraviolet intensity P is as follows: Figure 8 As shown, according to Figure 7 As shown, for example, in a certain experimental design, the actual time period corresponding to the independent space I is 7:00-9:00. In the experimental design, the experimental time period corresponding to the time period of 7:00-9:00 is 0.1h, then Δt2=0.1h, Δh=t-Δt2=2-0.1=1.9, ΔT=k·Δh=0.23·1.9=0.437, then when T is known, the value of T' can be calculated. In this embodiment, the calculated T' value is as follows Fig. 9 As shown, the RH' results are as follows Fig.10 As shown, Figure 8 , 9 , 10 are all actual time periods, and during the simulation experiment, the time period for the asphalt to pass through each independent space is Δt2. Δt2 is the time it takes for the asphalt to pass through each independent space during the experiment. The purpose of the asphalt aging simulation experiment is to predict the actual use of asphalt. The simulation needs to be completed in a relatively short time. It is impossible to conduct the simulation experiment according to the actual time period, but it is necessary to conduct the experiment according to the experimental time period of the experimental design. Since Δt2 is determined by the experimental design and cannot be changed at will, two ultraviolet lamps 11 are actually installed in the independent space I. Therefore, it is necessary to select an ultraviolet lamp 11 with a suitable irradiation range. Taking the independent space I as an example, the working process of the experimental device of the present invention is further explained. The actual time period corresponding to the independent space I is 6:00-8:00. According to Figure 8 As shown, during the actual time period 6:00-7:00, the simulated ultraviolet intensity P = 0, during 7:00-8:00, the simulated ultraviolet intensity P = 0.2, Δt1 = 1. Since the asphalt is in an independent space, there is no ultraviolet intensity at the beginning. The master control system transmits a signal to the ultraviolet light control system. After receiving and identifying the signal, the ultraviolet light control system controls the ultraviolet lamp 11 on the right side of the independent space I to operate and generate ultraviolet light with an intensity of 0.2. At the same time, according to Fig. 9As shown, during 6:00-8:00, the simulated experimental temperature T'=13°C, the master control system transmits a signal to the temperature control system, the temperature control system controls the cold source output and the temperature control resistor 9 to heat, and cooperates with the atomizing nozzle 8 to spray cold air to adjust the temperature in the independent space I to 13°C. Fig.10 As shown, from 6:00 to 8:00, the humidity of the simulation experiment is RH'=85%. The master control system transmits a signal to the humidity control system. After receiving and identifying the signal, the humidity control system controls the output of the water source and the rotation of the fan 12, and the atomizing nozzle 8 sprays water mist. In conjunction with the rotation of the fan 12, the humidity in the independent space I is adjusted to 85%. The master control system controls the output flow of the cold source and the water source, so that the atomizing nozzle 8 can spray different amounts of cold air and water mist. Δt2 is determined by the experimental design. The distance between the two baffles 4 separating the independent space I is fixed. The transmission speed of the conveyor belt 5 can be determined according to the distance between the baffles 4 and Δt2. In addition, after the time when the asphalt is irradiated by the right ultraviolet lamp 11 is determined according to the experimental design, the irradiation range of the ultraviolet lamp 11 can be calculated through the conveyor belt 5 and the asphalt irradiation time determined by the experimental design. The model of ultraviolet lamp 11 with a suitable irradiation range can be selected. In the remaining independent spaces, the regulation of the simulation experiment parameters is the same as that of the independent space I, and the temperature control system, humidity control system, and ultraviolet light control system independently regulate the conditions of each independent space.

[0057] In the above process, the conveyor belt drives the asphalt to move from independent space I, and after passing through the remaining 11 independent spaces, it returns to independent space I, completing the simulation of one day of actual aging of the asphalt. If the asphalt returns to independent space I, the master control system will transmit the simulation experiment parameter signal of the next day to the relevant control system, and the relevant control system will then control the ultraviolet lamp and other components to adjust the environmental conditions in the independent space to correspond to the actual meteorological data of the next day. The conveyor belt continues to drive the asphalt to move, and the asphalt aging simulation experiment of the next day can be carried out. Therefore, according to the actual situation, by dividing the minimum time period and combining the number of cycles, the simulated aging experiment of asphalt in different time lengths can be realized, such as simulating asphalt aging for one month, one quarter, or one year.

[0058] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the present invention.

Claims

1. A multi-condition coupled asphalt aging simulation experimental device, characterized in that: The asphalt aging simulation experimental device comprises a chassis (1), the front side of the chassis (1) is a door body (2), the door body (2) is opened and closed by an electro-hydraulic push rod (3), the interior of the chassis (1) is divided into an experimental area and a control area by a horizontal partition, the internal space of the experimental area is divided into a plurality of independent spaces arranged in a horizontal direction and open at the bottom by a partition (4), a conveyor belt (5) is installed below the independent space, an electric lifting platform (6) is installed on the left and right sides of the experimental area, the table top of the electric lifting platform (6) is in contact with and flush with the conveyor belt (5), an electric push plate (7) is installed on the table top of the electric lifting platform (6), and the pushing direction of the electric push plate (7) is toward the conveyor belt (5), an atomizing nozzle (8), a temperature control resistor (9), a temperature and humidity sensor (10), and an ultraviolet lamp (11) are installed in the independent space, and a vent is provided on the rear side of each of the independent spaces, and a fan (12) is installed at the vent ), the fan (12) is connected to the humidity control system in communication, the temperature control resistor (9) is connected to the temperature control system in communication, the temperature and humidity sensor (10) is connected to the master control system in communication, the ultraviolet lamp (11) is connected to the ultraviolet light control system in communication, the atomizing nozzle (8) is connected to the water source and the cold source respectively, the water source and the cold source are connected to the master control system in communication, a gravity sensor (13) is also installed on the electric lifting platform (6) surface, the gravity sensor (13) is connected to the master control system in communication, the conveyor belt (5), the electric lifting platform (6), and the electric push plate (7) are all connected to the master control system in communication, the master control system is connected to the temperature control system, the humidity control system, and the ultraviolet light control system in communication, the conveyor belt (5) drives the asphalt to move through different independent spaces, so that the asphalt is aged under different environmental conditions, and the electric lifting platform (6) transports the asphalt to the conveyor belt (5) at different heights.

2. The multi-condition coupled asphalt aging simulation experimental device according to claim 1 is characterized by: The conveyor belt (5) includes a first conveyor belt (501) and a second conveyor belt (502). The first conveyor belt (501) is installed in the middle position of the experimental area, and the second conveyor belt (502) is installed at the bottom of the experimental area. The number of independent spaces above the first conveyor belt (501) is 6, and the number of independent spaces below the first conveyor belt (501) is 6.

3. The multi-condition coupled asphalt aging simulation experimental device according to claim 1 is characterized by: The atomizing nozzle (8) and the ultraviolet lamp (11) are installed on the top surface of the independent space, and the temperature control resistor (9) is installed on the bottom of the partition (4).

4. The multi-condition coupled asphalt aging simulation experimental device according to claim 1 is characterized by: The asphalt aging simulation test device also includes a slide rail (14), which is installed inside the test area and located at the top of the independent space, and the partition (4) is installed on the slide rail (14).

5. The multi-condition coupled asphalt aging simulation experimental device according to claim 4 is characterized by: The slide rail (14) is marked with scale.

6. The multi-condition coupled asphalt aging simulation experimental device according to claim 1 is characterized by: The control area is provided with a main control room (15), a temperature control room (16), a humidity control room (17), and an ultraviolet light control room (18); the main control system is installed in the main control room (15); the temperature control system is installed in the temperature control room (16); the humidity control system is installed in the humidity control room (17); the ultraviolet light control system is installed in the ultraviolet light control room (18); a small refrigerator (19) is arranged in the temperature control room (16); a small humidifier (20) is arranged in the humidity control room (17); the atomizing nozzle (8) is connected to the small refrigerator (16) and the small humidifier (20) respectively; the temperature control system is connected to the small refrigerator (16) in communication; and the humidity control system is connected to the small humidifier (20) in communication.

7. The multi-condition coupled asphalt aging simulation experimental device according to claim 1 is characterized by: Universal wheels (21) are installed at the bottom of the chassis (1).

8. An asphalt aging simulation test method, characterized in that: A simulation experiment is carried out using the asphalt aging simulation experimental device according to any one of claims 1 to 7, wherein the experimental method comprises the following steps: (1) Collecting meteorological data from the Meteorological Bureau through the master control system, wherein the meteorological data includes temperature, humidity, and ultraviolet radiation data; (2) dividing the meteorological data collected in step (1) into meteorological data in different time periods according to different time periods, calculating the average values ​​of the temperature, humidity, and ultraviolet radiation data in a certain time period, and converting the average values ​​to obtain simulation experiment parameters in different time periods; (3) In step (2), different time periods correspond to different independent spaces. After the master control system converts actual meteorological data into simulation experiment parameters, the master control system transmits signals to the temperature control system, the humidity control system, and the ultraviolet light control system respectively. The temperature control system controls the operation of the atomizing nozzle (8) and the temperature control resistor (9) according to the received signals to adjust the temperature in different independent spaces to the simulation experiment temperature. The humidity control system controls the operation of the atomizing nozzle (8) and the fan (12) according to the received signals to adjust the humidity in different independent spaces to the simulation experiment humidity. The ultraviolet light control system controls the ultraviolet lamp (11) according to the received signals to adjust the humidity in different independent spaces to the simulation experiment humidity. The ultraviolet intensity in the independent space is adjusted to the simulated experimental intensity. The temperature and humidity sensor (10) detects the temperature and humidity conditions in the independent space in real time and transmits the signal to the master control system. The master control system compares the received signal with the simulated experimental temperature and the simulated experimental humidity. When a difference occurs, the master control system sends a signal to the temperature control system and the humidity control system. The temperature control system controls the operation of the atomizing nozzle (8), the temperature control resistor (9) and the fan (12) to adjust the temperature and humidity conditions in the independent space to the simulated experimental temperature and the simulated experimental humidity. The conveyor belt (5) transports the asphalt through different independent spaces and ages it under different simulated experimental parameter conditions.

9. The experimental method according to claim 8, characterized in that: The actual meteorological data are converted into simulation experiment parameters through the following formula: Where P is the simulated UV intensity, in kw / m 2 , W is the average value of actual ultraviolet radiation during the Δt1 period, in kw / m 2 , Δt1 is the actual time period of ultraviolet radiation divided according to the experimental design, in h; Δh=t-Δt2, where Δh is the time increase value under the same aging degree, in h, t is the actual time period divided by the experimental design, in h, and Δt2 is the experimental time period of the experimental design, in h; ΔT = k·Δh, where k is the correlation coefficient (k = 0.23) and ΔT is the equivalent temperature in °C; T'=T+ΔT, where T' is the simulated experimental temperature within Δt2, in °C, and T is the average actual temperature within t, in °C; RH'=RH, where RH is the actual average humidity within t, in %RH, and RH' is the simulated experimental humidity within Δt2, in %RH.

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