Indoor evaluation device for VOCs emission characteristics of asphalt concrete pavement structure

Abstract

The present invention discloses an indoor evaluation device for VOCs emission characteristics of an asphalt concrete pavement structure, comprising a sealed chassis, a lane slab, a counterweight platform, a paver for spreading asphalt concrete on the lane slab, a compactor for compacting the lane slab, a temperature and humidity controller for controlling the temperature and humidity in the sealed chassis, an ultraviolet lamp for simulating sunlight to provide a light source for the sealed chassis, and a sampling port for collecting VOCs samples of the asphalt concrete in the sealed chassis. The evaluation device can realize VOCs emissions during the construction and operation and maintenance stages of the asphalt concrete pavement structure in a simulated road environment indoors.

Description

Technical Field

[0001] The present invention relates to the technical field of road engineering environmental assessment, and in particular to an indoor assessment device for VOCs emission characteristics of an asphalt concrete pavement structure. Background Art

[0002] Asphalt pavement is the main type of pavement in road construction, and as an important part of road infrastructure, reducing the negative impact of asphalt pavement construction on the environment is also an important part of solving the key technical problems of low environmental impact construction of road infrastructure. Asphalt pavement will produce varying degrees of "volatile organic compounds (VOCs)" throughout its construction and operation life cycle, which will have a negative impact on the environment. In June 2019, the "Comprehensive Control Plan for Volatile Organic Compounds in Key Industries" issued by the Ministry of Ecology and Environment pointed out that VOCs pollution emissions have a significant impact on the atmospheric environment. VOCs are important precursors to the formation of fine particulate matter (PM2.5) and ozone (O3), and also have an impact on climate change.

[0003] Asphalt VOCs not only have a complex composition, but their concentration also varies greatly with changes in the construction environment. Clarifying the emission characteristics of asphalt-based VOCs is not only an important prerequisite for accurately understanding the emission characteristics of asphalt-based VOCs, but also the basis for implementing asphalt VOCs emission pollution control. It is very important for VOCs control and emission reduction in the road field.

[0004] However, current research at home and abroad focuses more on the road performance of asphalt concrete, and there is less evaluation of the environmental performance during the construction and operation of asphalt pavements. The research and development of related evaluation equipment is still in its infancy, which further limits the practitioners' understanding of the VOCs emission characteristics during the construction and operation of asphalt pavements in advance, thereby reducing the environmental pollution caused by the construction and operation of asphalt pavements. Summary of the invention

[0005] The purpose of the present invention is to provide an indoor evaluation device for VOCs emission characteristics of asphalt concrete pavement structure, which can realize VOCs emissions during the construction and operation and maintenance stages of asphalt concrete pavement in an indoor simulated road environment.

[0006] In order to achieve the above purpose, the technical solutions adopted are as follows:

[0007] An indoor evaluation device for VOCs emission characteristics of an asphalt concrete pavement structure, comprising a sealed chassis, a lane slab arranged in the sealed chassis, a counterweight plate, a paver for paving asphalt concrete on the lane slab, a compactor for compacting the lane slab, a temperature and humidity controller for controlling the temperature and humidity in the sealed chassis, an ultraviolet light for simulating sunlight to provide a light source for the sealed chassis, and a sampling port for collecting VOCs samples of the asphalt concrete in the sealed chassis;

[0008] The paver is controlled to slide on the roadway slab by a threaded connecting rod, and a motor for controlling the rotation of the connecting rod is provided at the top of the threaded connecting rod.

[0009] The compactor is movably arranged on a slide bar, the ultraviolet light is arranged below the slide bar, the counterweight plate is arranged above the compactor to provide wheel load pressure for simulating road compaction, the wheel roller of the compactor is connected to the output end of the second motor, and the wheel roller is driven by the second motor to rotate in forward and reverse directions so that the compacted road surface reaches the target porosity.

[0010] Furthermore, the sliding rod is movably arranged on the first bracket so as to be able to move up and down.

[0011] Furthermore, the second motor is mounted on the sliding rod.

[0012] Furthermore, a rotating rod with a gear is arranged inside the silo of the paver, and the rotating rod is connected to the output end of the third motor.

[0013] Furthermore, a height-adjustable spreading plate is arranged at the rear of the paver.

[0014] Furthermore, the temperature and humidity controller includes a controller, a temperature sensor and a humidity sensor, and the signal output ends of the temperature sensor and the humidity sensor are connected to the signal input end of the controller.

[0015] Furthermore, a second bracket for placing a paver is provided in front of the driveway slab.

[0016] Furthermore, a sampling tube is provided on the sampling port, and one end of the sampling tube extends into the interior of the sealed chassis.

[0017] Furthermore, the illumination intensity of the ultraviolet light provided by the simulated sunlight can be accurately regulated.

[0018] The beneficial effects of the present invention are:

[0019] An indoor evaluation device for VOCs emission characteristics of asphalt concrete pavement structure according to the present invention can simulate the road environment during the construction and operation and maintenance stages of asphalt pavement, provide necessary tools for objectively evaluating the VOCs emission characteristics of asphalt mixtures under the influence of different asphalt materials and road environments, and fill the current industry's shortage of indoor evaluation devices for VOCs emission characteristics during the construction and operation and maintenance stages of asphalt pavement. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 An example of a front structural schematic diagram of an indoor evaluation device for VOCs emission characteristics of an asphalt concrete pavement structure according to an embodiment of the present invention is shown.

[0021] Reference numerals:

[0022] 1 is a sealed chassis, 2 is a first bracket, 3 is a temperature sensor, 4 is a sliding rod, 5 is a temperature and humidity controller, 6 is a first motor, 7 is an ultraviolet light, 8 is a second bracket, 9 is a paver silo, 10 is a sampling port, 11 is a sampling tube, 12 is a humidity sensor, 13 is a counterweight plate, 14 is a second motor, 15 is a lane plate, 16 is a threaded connecting rod, 17 is a third motor, 18 is a spreading plate, 19 is a rotating rod with a gear, 20 is a paver, 21 is a compactor, and 22 is a wheel roller. DETAILED DESCRIPTION

[0023] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0024] In the description of the present invention, unless otherwise specified, "plurality" means two or more than two; the orientations or positional relationships indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0025] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] The specific implementation of the present invention is further described in detail below in conjunction with the drawings and examples.

[0027] Figure 1The front structural schematic diagram of an indoor evaluation device for VOCs emission characteristics of asphalt concrete pavement structure according to an embodiment of the present invention is illustrated. The embodiment of the present invention provides an indoor evaluation device for VOCs emission characteristics of asphalt concrete pavement structure, such as Figure 1 As shown, the indoor evaluation device for VOCs emission characteristics of asphalt concrete pavement structure includes a sealed case 1, a lane plate 15 arranged in the sealed case 1, a counterweight plate 13, a paver 20 for paving asphalt concrete on the lane plate 15, a compactor 21 for compacting the lane plate 15, a temperature and humidity controller 5 for controlling the temperature and humidity in the sealed case 1, an ultraviolet light 7 for simulating sunlight to provide a light source for the sealed case 1, and a sampling port 10 for collecting VOCs samples of asphalt concrete in the sealed case 1. The sealed case 1 is provided with a lane plate 15 for forming an asphalt mixture surface layer, and the lane plate 15 is provided with a paver 20 for paving asphalt mixture. The paver 20 is controlled to slide on the lane plate 15 by a threaded connecting rod 16, and a first motor 6 for controlling the rotation of the connecting rod is provided at the top of the threaded connecting rod 16. A second bracket 8 for placing the paver 20 is provided in front of the lane plate 15. The compactor 21 is fixed on the slide bar 4, and the compactor 21 can move freely forward and backward on the slide bar 4. The slide bar 4 is installed on the first bracket 2, wherein the slide bar 4 can move up and down on the first bracket 2. An ultraviolet light 7 simulating sunlight is provided under the slide bar 4; a counterweight plate 13 is provided above the compactor 21 to provide wheel load pressure simulating road compaction. The wheel roller 22 of the compactor 21 is controlled to rotate by the second motor 14 above the slide bar 4, and the second motor 14 can rotate in forward and reverse directions to meet the purpose of repeatedly compacting the asphalt mixture by the wheel roller 22, so that the compacted road surface reaches the target porosity.

[0028] The hopper 9 of the paver 20 has a rotating rod 19 with a gear inside, and the rotating rod 19 is driven to rotate by the third motor 17. The paver 20 has a paver plate 18 with adjustable height at the rear.

[0029] The sealed case 1 is provided with a temperature and humidity controller 5 , a temperature sensor 3 , and a humidity sensor 12 for adjusting the humidity and temperature in the sealed case 1 .

[0030] Exemplarily, the temperature sensor 3 and the humidity sensor 12 are used to collect the temperature and humidity signals in the sealed case 1, and feed the temperature and humidity signals to the temperature and humidity controller 5, and the temperature and humidity controller 5 controls the temperature and humidity inside the sealed case 1 according to the set temperature and humidity thresholds. The set temperature and humidity thresholds can be a typing device connected to the temperature and humidity controller 5 and arranged outside the sealed case 1, such as a keyboard with a display or a touch screen, so that the temperature and humidity controller 5 obtains the set temperature and humidity thresholds. The temperature and humidity controller 5 can control the temperature and humidity in the sealed chassis 1 by configuring an electric heating component and a humidifying component in the sealed chassis 1, wherein the electric heating component can be an existing electric heating device such as an electric heating plate and an electric heating coil, which can heat the surrounding environment by powering on, and the humidifying component can be a nozzle combined with a humidifying tube, the nozzle is fixed in the sealed chassis 1, and the humidifying tube is provided with a solenoid valve controlled by the temperature and humidity controller 5. One end of the humidifying tube is connected to the nozzle, and the other end is sealed through the sealed chassis 1 and connected to a pressurized water source (such as tap water from a municipal pipeline or clean water stored in a pressure tank, etc.). If the humidity signal is not within the set humidity threshold range and the humidity is too low, the temperature and humidity controller 5 can control the solenoid valve to open, and spray a certain amount of water mist into the sealed chassis 1 through the nozzle until the humidity rises to the set humidity threshold and then controls the solenoid valve to close.

[0031] It is understandable that an air conditioning system may also be configured on the sealed case 1, and the air conditioning system may be used to implement the temperature and humidity signal control in the sealed case 1. The air conditioning system is an existing system, and this embodiment will not be elaborated in detail here.

[0032] A sampling port 10 for collecting VOCs samples of asphalt concrete in the sealed chassis is provided at the upper right side of the sealed chassis 1 , and a sampling tube 11 extending into the interior of the sealed chassis 1 is provided on the sampling port 10 .

[0033] The specific operation process of the present invention is:

[0034] 1) The sealed box 1 is adjusted to the set temperature and humidity through the temperature and humidity controller 5, the light intensity of the ultraviolet light 7 is turned on and set, and the mixed asphalt mixture is placed in the silo 9 of the paver 20. The threaded connecting rod 16 is driven to rotate by the first motor 6, so that the paver moves forward on the roadway slab 15. During the advancement of the paver, the third motor 17 is turned on to rotate the rotating rod 19 with gears in the silo 9, so that the asphalt mixture in the silo 9 is evenly spread on the roadway slab. During the advancement of the paver 20, the height of the paving plate 18 needs to be adjusted in advance according to the thickness of the pavement structure. When the asphalt mixture is evenly spread on the roadway slab 15, the paver 20 is parked on the second bracket 8. During the paving of the asphalt mixture, the VOCs in the paving stage of the asphalt pavement construction process are collected through the sampling tube 11 set in the sampling port 10;

[0035] 2) Move the slide bar 4 on the first bracket 2 to the height required for the compaction thickness of the asphalt pavement, control the second motor 14 to work, so that the wheel roller 22 on the compactor 21 moves back and forth on the asphalt mixture spread in the lane slab 15 to compact it, and the number of compactions is determined according to the target porosity of the pavement. During the rolling process of the asphalt mixture, the VOCs in the rolling stage of the asphalt pavement construction process are collected through the sampling tube 11 provided in the sampling port 10;

[0036] 3) After the asphalt mixture on the lane slab 15 cools to room temperature, the sealed chassis 1 is adjusted to the set temperature and humidity through the temperature and humidity controller 5, and the light intensity of the ultraviolet light 7 is turned on and set. The values ​​of temperature, humidity and light intensity are determined according to the road environment in the operation and maintenance stage of the asphalt pavement. The VOCs of the asphalt mixture in the operation and maintenance stage are collected through the sampling tube 11 set in the sampling port 10.

[0037] The above implementation modes are only used to illustrate the present invention, but not to limit the present invention. Ordinary technicians in the relevant technical field can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions also belong to the scope of the present invention. The patent protection scope of the present invention should be defined by the claims.

Claims

1. An indoor evaluation device for VOCs emission characteristics of asphalt concrete pavement structure, characterized in that: It includes a sealed chassis, a lane slab arranged in the sealed chassis, a counterweight plate, a paver for paving asphalt concrete on the lane slab, a compactor for compacting the lane slab, a temperature and humidity controller for controlling the temperature and humidity in the sealed chassis, an ultraviolet light for simulating sunlight to provide a light source for the sealed chassis, and a sampling port for collecting VOCs samples of the asphalt concrete in the sealed chassis; The paver is controlled to slide on the roadway slab by a threaded connecting rod, and a first motor for controlling the rotation of the connecting rod is provided at the top of the threaded connecting rod; The compactor is movably arranged on the slide bar, the ultraviolet light is arranged below the slide bar, the counterweight plate is arranged above the compactor to provide wheel load pressure for simulating road compaction, the wheel roller of the compactor is connected to the output end of the second motor, and the wheel roller is driven by the second motor to rotate in forward and reverse directions, so that the compacted road surface reaches the target porosity; A rotating rod with a gear is arranged inside the silo of the paver, and the rotating rod is connected to the output end of the third motor; The temperature and humidity controller comprises a controller, a temperature sensor and a humidity sensor, wherein the signal output ends of the temperature sensor and the humidity sensor are connected to the signal input end of the controller; The sliding rod is movably arranged on the first bracket up and down; A height-adjustable spreading plate is arranged at the rear of the paver; A second bracket for placing a paver is provided in front of the lane slab; The specific operation process of the indoor evaluation device is as follows: 1) Adjust the sealed box to the set temperature and humidity through the temperature and humidity controller, turn on and set the light intensity of the ultraviolet light, place the mixed asphalt mixture in the silo of the paver, and use the first motor to drive the threaded connecting rod to rotate, so that the paver moves forward on the lane slab. During the process of the paver moving forward, turn on the third motor to rotate the rotating rod with gears in the silo, so that the asphalt mixture in the silo is evenly spread on the lane slab. During the process of the paver moving forward, the height of the paving plate needs to be adjusted in advance according to the thickness of the pavement structure. When the asphalt mixture is evenly spread on the lane slab, the paver is parked on the second bracket. During the asphalt mixture paving process, the VOCs in the paving stage of the asphalt pavement construction process are collected through the sampling tube set in the sampling port; 2) Move the slide bar on the first bracket to the height required for the compaction thickness of the asphalt pavement, control the second motor to work, so that the roller on the compactor moves back and forth on the asphalt mixture spread in the lane slab to compact it. The number of compactions is determined according to the target porosity of the pavement. During the rolling process of the asphalt mixture, the VOCs in the rolling stage of the asphalt pavement construction process are collected through the sampling tube set in the sampling port; 3) After the asphalt mixture on the lane slab cools to room temperature, adjust the sealed chassis to the set temperature and humidity through the temperature and humidity controller, turn on and set the light intensity of the ultraviolet light. The values ​​of temperature, humidity and light intensity are determined according to the road environment during the operation and maintenance stage of the asphalt pavement. The VOCs of the asphalt mixture during the operation and maintenance stage are collected through the sampling tube set in the sampling port.

2. The indoor evaluation device for VOCs emission characteristics of asphalt concrete pavement structure according to claim 1 is characterized in that: The second motor is mounted on the sliding rod.

3. The indoor evaluation device for VOCs emission characteristics of asphalt concrete pavement structure according to claim 1, characterized in that: A sampling tube is arranged on the sampling port, and one end of the sampling tube extends into the interior of the sealed chassis.

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