Method for testing internal and external temperature and humidity balance of reduced-scale asphalt pavement structure

Abstract

The invention provides a method for testing internal and external temperature and humidity balance of a reduced-scale asphalt pavement structure, and belongs to the technical field of road engineering. According to the method, a reduced-scale asphalt pavement structure internal and external temperature and humidity balance test device is adopted to carry out tests of simulating natural basic working conditions, simulating standard regulation and control working conditions, simulating non-standard regulation and control working conditions and simulating wading regulation and control working conditions. The testing device is composed of a heat-insulation and moisture-insulation supporting frame, an environment control system, a reduced-scale asphalt pavement structure and a sensor monitoring system. Temperature and humidity parameters of a reduced-scale asphalt pavement structure formed by splicing test pieces are quickly regulated and controlled indoors, so that a temperature and humidity balance basic rule when an actual asphalt pavement reaches a specified standard or non-standard working condition from a natural basic working condition can be conveniently and effectively simulated, and basic test data can be accumulated; the energy consumption and cost required by the test are greatly reduced, and a foundation is laid for formulating a specified temperature and humidity environment regulation and control scheme in a full-scale accelerated loading experiment.

Description

Technical Field

[0001] The invention relates to the technical field of road engineering, and in particular to a test method for internal and external temperature and humidity balance of a scaled asphalt pavement structure. Background Art

[0002] As one of the important components of my country's transportation infrastructure, the service performance and life of asphalt pavement in its natural environment are crucial to my country's economic development. The service environment of asphalt pavement is all-weather. In different seasons of the year and different times of the day, there will be a gradient difference in temperature and relative humidity between the bottom roadbed and the top air of the pavement structure, which makes the overall temperature and humidity of the asphalt pavement structure in a state of dynamic equilibrium. Effective simulation and precise control of the temperature and humidity environment through experimental means is the basis for conducting relevant research on the structural behavior characteristics and material performance laws of asphalt pavements in the specified service environment in the field of road engineering.

[0003] Large-scale environmental control systems are usually used to fully simulate the service environment of asphalt pavement structures, and are mostly used in the field of full-scale accelerated loading tests to achieve the control of the asphalt pavement test road to a specified temperature and humidity balance state, and to prepare for related research. However, due to the large energy consumption and high cost of large-scale environmental control systems during operation, there is a lack of important systematic basic test data such as "mutual control of high and low temperatures", "mutual control of high and low relative humidity", "effects of different temperature changes on relative humidity", and the corresponding internal and external balance waiting time of asphalt pavement structures, especially for conditions involving large temperature difference control, such as "simulating low-temperature environments in hot summer weather" and "simulating high-temperature environments in cold winter weather". At present, there is a lack of economically feasible test methods to effectively achieve rapid adjustment, monitoring and accumulation of basic test data for temperature and humidity balance of asphalt pavement structures, which restricts the development of full-scale accelerated loading research, especially involving environmental control.

[0004] Therefore, in order to efficiently simulate the service environment of asphalt pavement structures and accumulate basic data such as the laws and waiting time of the equilibrium state achieved by regulating internal and external temperature and humidity parameters, it is necessary to develop a simple test method for the internal and external temperature and humidity balance of asphalt pavement structures. Summary of the invention

[0005] In order to solve the technical problems existing in the prior art, the embodiment of the present invention provides a test method for the temperature and humidity balance inside and outside the scaled asphalt pavement structure, which can realize the rapid adjustment, monitoring and basic test data accumulation of the temperature and humidity balance of the asphalt pavement structure. The technical solution is as follows:

[0006] A test method for the internal and external temperature and humidity balance of a scaled asphalt pavement structure, the method uses a scaled asphalt pavement structure internal and external temperature and humidity balance test device to perform the following test:

[0007] (1) Simulating natural foundation conditions:

[0008] By regulating the bottom circulating temperature control elbow and the top circulating temperature control heat sink of the test device, the temperature parameters at the bottom and top of the scaled asphalt pavement structure are respectively set to be consistent with the temperature state of the soil roadbed and road surface air of the actual asphalt pavement structure under the specified natural foundation working condition, and the temperature change process and waiting time of the scaled asphalt pavement structure reaching temperature equilibrium as a whole are recorded to achieve simulation of the natural foundation working condition;

[0009] (2) Simulating standard control conditions:

[0010] After reaching the specified natural foundation working condition, according to the experimental requirements, the temperature of the circulating temperature control heat sink on the top of the test device is adjusted, and the temperature change process and waiting time for the scaled asphalt pavement structure to reach temperature equilibrium as a whole are recorded;

[0011] (3) Simulating non-standard control conditions:

[0012] After reaching the specified natural foundation working condition, according to the experimental requirements, the temperature of the bottom circulation temperature control elbow and the top circulation temperature control heat sink of the test device are adjusted at the same time, and the temperature change process law and waiting time for the scaled asphalt pavement structure to reach temperature equilibrium as a whole are recorded;

[0013] (4) Simulating water-related regulation conditions:

[0014] After reaching the specified natural basic working conditions, according to the experimental requirements, the bottom seepage pipe and the top water spray nozzle of the test device are adjusted separately or simultaneously, and the humidity change process and waiting time for the scaled asphalt pavement structure to reach relative humidity equilibrium as a whole are recorded. After the humidity is balanced, the temperature of the bottom circulating temperature control elbow and the top circulating temperature control heat sink of the test device is further adjusted, and the relative humidity change process and waiting time at different temperatures are recorded.

[0015] The natural basic working condition refers to the natural temperature state of the actual asphalt pavement structure within the structural thickness range from the soil roadbed to the road surface air in different seasons of the year and different times of the day. During the experiment, the actual asphalt pavement structure temperature state of a period of time is selected as the specified natural basic working condition.

[0016] The standard control condition refers to that on the basis of the natural basic condition that the internal and external temperature balance has been achieved, only the temperature parameters of the road surface air are changed, so that the scaled asphalt pavement structure gradually reaches the overall temperature balance from top to bottom. It is usually suitable for simulating high temperature control in hot summer weather, low temperature control in severe winter weather, and small temperature difference control in comfortable spring and autumn weather.

[0017] The non-standard control condition refers to the scaled asphalt pavement structure, on the basis of the natural basic condition that the internal and external temperature balance has been achieved, while the temperature parameters of the earth roadbed and the road surface air are simultaneously increased or decreased, so that the scaled asphalt pavement structure gradually reaches the overall temperature balance from top to bottom and from bottom to top. It is usually suitable for simulating low-temperature control in hot summer weather, high-temperature control in cold winter weather and other tests against the trend with large temperature differences.

[0018] The water-related control condition refers to changing the relative humidity parameters of the soil roadbed and road surface air of the scaled asphalt pavement structure on the basis of any of the natural foundation work, the standard control condition and the non-standard control condition, so that the scaled asphalt pavement structure as a whole gradually reaches a relative humidity balance.

[0019] The test device is composed of a temperature and moisture insulation support frame, an environmental control system, a scaled asphalt pavement structure and a sensor monitoring system;

[0020] The thermal insulation and moisture insulation support frame is composed of a support frame and a thermal insulation and moisture insulation layer.

[0021] The environmental control system is composed of circulating temperature control radiator, water spray nozzle, ventilation fan blade, circulating temperature control elbow and seepage pipe.

[0022] The sensor monitoring system consists of a temperature sensor and a relative humidity sensor;

[0023] The support frame is located at the outermost side of the whole test device and provides support. The thermal and moisture insulation layer is close to the edge of the scaled asphalt pavement structure to ensure that the gradient difference of temperature and humidity can only be transmitted from top to bottom and from bottom to top within the scaled asphalt pavement structure.

[0024] There is a reserved space between the upper part of the scaled asphalt pavement structure and the thermal and moisture-insulating layer, a circulating temperature-control heat sink is installed on the top of the reserved space, a water spray nozzle is installed in the center of the top of the reserved space, a ventilation fan blade is installed on the side wall of the reserved space, and a group of temperature sensors and relative humidity sensors are installed in the reserved space; a circulating temperature-control elbow is installed at the bottom of the scaled asphalt pavement structure close to the bottom surface of the scaled asphalt pavement structure, and a seepage pipe is installed at the bottom of the circulating temperature-control elbow;

[0025] The temperature sensor and the relative humidity sensor are arranged on the surface of each layer of the scaled asphalt pavement structure along the vertical direction.

[0026] The scaled asphalt pavement structure is consistent with the material settings of each layer of the actual full-scale asphalt pavement structure, and is composed of an asphalt surface layer, a cement-stabilized crushed stone base layer, a fly ash-stabilized crushed stone base layer and a soil base layer.

[0027] The asphalt surface layer is divided into 2-3 layers, each layer is 2cm-10cm thick, and the interface between the layers is filled with asphalt mortar;

[0028] The cement stabilized crushed stone base is divided into two layers, each layer is 10-50cm thick, and the interface between the layers is filled with cement mortar;

[0029] The fly ash stabilized crushed stone base is a layer with a thickness of 10-50cm, and the top surface uses cement mortar as a binder;

[0030] The soil base layer is a single layer with a thickness of 10-100 cm, and the top surface is roughened.

[0031] The length and width of the scaled asphalt pavement structure are not less than 30 cm, preferably 30 cm to 60 cm, and the height is not less than 1 m, preferably 1 m to 2 m.

[0032] The temperature sensor and the relative humidity sensor in the scaled asphalt pavement structure are symmetrically arranged in the middle of each layer surface of the scaled asphalt pavement structure in the horizontal direction, and the cables are led out through the lead holes.

[0033] The height of the reserved space is 10-30 cm, preferably 20 cm; the circulating temperature control heat sink covers the top of the reserved space;

[0034] A group of temperature sensors and relative humidity sensors in the reserved space are installed at 1 / 2 of the height of the reserved space and are installed on the side wall.

[0035] The distance between the seepage pipe and the circulating temperature control elbow is 3-10 cm, preferably 5 cm; the distance between the seepage pipe and the bottom temperature and moisture insulation layer is 3-10 cm, preferably 3 cm.

[0036] The temperature control range of the top circulation temperature control radiator and the bottom circulation temperature control elbow of the test device is -30℃~100℃, the relative humidity control range is 0~100%RH, the water seepage control range is 0~0.5L / min, and the water spraying control range is 0~10mm / h.

[0037] The thickness of the temperature and moisture insulation layer ranges from 5 cm to 10 cm.

[0038] The beneficial effects brought about by the technical solution provided by the embodiment of the present invention include at least:

[0039] (1) The present invention is formed by splicing indoor molded test pieces with different structural layers of materials and thicknesses that are completely consistent with those of actual asphalt pavements, so that the temperature and humidity balance experimental data obtained according to the scaled asphalt pavement structure of the present invention can effectively provide a reference for the environmental adjustment of the actual full-scale pavement, thereby realizing low-energy and low-cost exploration of the basic laws of temperature and humidity balance;

[0040] (2) The present invention can conveniently and quickly regulate parameters such as the temperature and relative humidity at the top and bottom of a scaled asphalt pavement structure, and can simulate the actual temperature state of an asphalt pavement structure in any season. On this basis, it can achieve rapid and precise regulation over a large temperature range, thereby effectively accumulating basic experimental data on the temperature and humidity balance of such extreme working conditions, and laying a foundation for the formulation of a specified temperature and humidity environment control scheme in a full-scale accelerated loading experiment. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0042] Figure 1 It is a schematic diagram of the elevation structure of a test device for the internal and external temperature and humidity balance of a scaled asphalt pavement structure provided by an embodiment of the present invention;

[0043] Figure 2 is a top view of the arrangement of sensors in each structural layer of a scaled asphalt pavement according to an embodiment of the present invention;

[0044] Figure 3 It is a schematic elevation view of a scaled asphalt pavement structure in an embodiment of the present invention.

[0045] Among them: 1-support frame; 2-thermal insulation and moisture insulation layer; 3-scaled asphalt pavement structure; 4-temperature sensor; 5-relative humidity sensor; 6-circulating temperature control heat sink; 7-water nozzle; 8-ventilation fan blades; 9-circulating temperature control elbow; 10-seepage pipe; 11-lead hole; 31-asphalt surface layer; 32-cement stabilized gravel base layer; 33-fly ash stabilized gravel base layer; 34-soil base layer. DETAILED DESCRIPTION

[0046] The technical solution of the present invention is described below in conjunction with the accompanying drawings.

[0047] In the embodiments of the present invention, words such as "exemplarily" and "for example" are used to indicate examples, illustrations or explanations. Any embodiment or design described as "example" in the present invention should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of the word "example" is intended to present the concept in a specific way. In addition, in the embodiments of the present invention, the meaning expressed by "and / or" can be both, or it can be either of the two.

[0048] In order to make the technical problems, technical solutions and advantages to be solved by the present invention more clear, a detailed description will be given below with reference to the accompanying drawings and specific embodiments.

[0049] The embodiment of the present invention provides a test method for the internal and external temperature and humidity balance of a scaled asphalt pavement structure. The method uses a scaled asphalt pavement structure internal and external temperature and humidity balance test device to perform the following test:

[0050] (1) Simulating natural foundation conditions: by adjusting the bottom circulation temperature control elbow and the top circulation temperature control heat sink of the test device, the temperature parameters at the bottom and top of the scaled asphalt pavement structure are respectively set to be consistent with the temperature state of the soil roadbed and road surface air of the actual asphalt pavement structure under the specified natural foundation conditions, and the temperature change process and waiting time of the scaled asphalt pavement structure reaching temperature equilibrium as a whole are recorded to achieve simulation of natural foundation conditions;

[0051] (2) Simulating standard control conditions: After reaching the specified natural basic conditions, according to the experimental requirements, the temperature of the circulating temperature control heat sink on the top of the test device is adjusted, and the temperature change process and waiting time for the scaled asphalt pavement structure to reach temperature equilibrium are recorded;

[0052] (3) Simulating non-standard control conditions: After reaching the specified natural basic conditions, according to the experimental requirements, the temperatures of the bottom circulation temperature control elbow and the top circulation temperature control heat sink of the test device are simultaneously adjusted, and the temperature change process and waiting time for the scaled asphalt pavement structure to reach temperature equilibrium are recorded;

[0053] (4) Simulating water-related regulation conditions: After reaching the specified natural basic conditions, according to the experimental requirements, the bottom seepage pipe and the top water spray nozzle of the test device are regulated separately or simultaneously, and the humidity change process and waiting time for the scaled asphalt pavement structure to reach relative humidity equilibrium are recorded. After the humidity is balanced, the temperature of the bottom circulating temperature control elbow and the top circulating temperature control heat sink of the test device are further regulated, and the relative humidity change process and waiting time at different temperatures are recorded.

[0054] Among them, the natural basic working condition refers to the natural temperature state of the actual asphalt pavement structure within the structural thickness range from the soil roadbed to the road surface air in different seasons of the year and different times of the day. During the experiment, the actual asphalt pavement structure temperature state of a period of time is selected as the specified natural basic working condition.

[0055] The standard control condition refers to that on the basis of the natural basic condition that the internal and external temperature balance has been achieved, only the temperature parameters of the road surface air are changed, so that the scaled asphalt pavement structure gradually reaches the overall temperature balance from top to bottom. It is usually suitable for simulating high temperature control in hot summer weather, low temperature control in severe winter weather, and small temperature difference control in comfortable spring and autumn weather.

[0056] The non-standard control condition refers to the scaled asphalt pavement structure, on the basis of the natural basic condition that the internal and external temperature balance has been achieved, while the temperature parameters of the earth roadbed and the road surface air are simultaneously increased or decreased, so that the scaled asphalt pavement structure gradually reaches the overall temperature balance from top to bottom and from bottom to top. It is usually suitable for simulating low-temperature control in hot summer weather, high-temperature control in cold winter weather and other tests against the trend with large temperature differences.

[0057] The water-related control condition refers to changing the relative humidity parameters of the soil roadbed and road surface air of the scaled asphalt pavement structure on the basis of any of the natural foundation work, the standard control condition and the non-standard control condition, so that the scaled asphalt pavement structure as a whole gradually reaches a relative humidity balance.

[0058] like Figure 1 As shown, the test device is composed of a temperature and moisture insulation support frame, an environmental control system, a scaled asphalt pavement structure 3 and a sensor monitoring system;

[0059] The thermal insulation and moisture insulation support frame is composed of a support frame 1 and a thermal insulation and moisture insulation layer 2.

[0060] The environmental control system is composed of a circulating temperature control radiator 6, a water spray nozzle 7, a ventilation fan blade 8, a circulating temperature control elbow 9 and a water seepage pipe 10.

[0061] The sensor monitoring system is composed of a temperature sensor 4 and a relative humidity sensor 5;

[0062] The support frame 1 is located at the outermost side of the whole test device and provides support. The thermal and moisture insulation layer 2 is close to the edge of the scaled asphalt pavement structure 3 to ensure that the gradient difference of temperature and humidity can only be transmitted from top to bottom and from bottom to top within the scaled asphalt pavement structure 3.

[0063] There is a reserved space between the upper part of the scaled asphalt pavement structure 3 and the thermal and moisture-insulating layer 2, a circulating temperature-control heat sink 6 is installed on the top of the reserved space, a water spray nozzle 7 is installed in the center of the top of the reserved space, a ventilation fan blade 8 is installed on the side wall of the reserved space, and a group of temperature sensors and relative humidity sensors are installed in the reserved space; a circulating temperature-control elbow 9 is installed at the bottom of the scaled asphalt pavement structure 3, close to the bottom surface of the scaled asphalt pavement structure, and a seepage pipe 10 is installed at the bottom of the circulating temperature-control elbow 9;

[0064] The temperature sensor 4 and the relative humidity sensor 5 are arranged on the surface of each layer of the scaled asphalt pavement structure along the vertical direction.

[0065] like Figure 3 The scaled asphalt pavement structure 3 is consistent with the material settings of each layer of the actual full-scale asphalt pavement structure, and is composed of an asphalt surface layer 31, a cement-stabilized crushed stone base layer 32, a fly ash-stabilized crushed stone base layer 33 and a soil base layer 34.

[0066] like Figure 2 The temperature sensor 4 and the relative humidity sensor 5 in the scaled asphalt pavement structure are symmetrically arranged in the middle of each layer surface of the scaled asphalt pavement structure along the horizontal direction, and the cables are led out through the lead holes 11.

[0067] This will be described below with reference to specific embodiments.

[0068] In the specific experiment, the test specimens (i.e., the various layers of materials used to make the scaled asphalt pavement structure) are first formed in the indoor laboratory, and then spliced ​​to form the scaled asphalt pavement structure. The scaled asphalt pavement structure 3 is consistent with the material settings of the various layers of the actual full-scale asphalt pavement structure, and is mainly composed of structural layers such as asphalt surface layer 31, cement stabilized gravel base layer 32, fly ash stabilized gravel base layer 33 and soil base layer 34, wherein the asphalt surface layer 31 is, from top to bottom, a 4 cm thick SMA-16 upper layer, a 6 cm AC-20 middle layer and an 8 cm ATB-25 lower layer, the cement stabilized gravel layer 32 is spliced ​​by two layers of 18 cm thick structural layers, the fly ash stabilized gravel base layer 33 is 18 cm thick, and the soil base layer 34 is set to 28 cm thick. It should be noted that the parameters such as the type, material and thickness of each structural layer of the scaled asphalt pavement structure 3 can be arbitrarily combined and selected according to research needs. The scaled asphalt pavement structure 3 of this embodiment is only one of the typical asphalt pavement structures in road engineering.

[0069] Then, a thermal insulation and moisture-proof layer 2 is tightly wrapped around the scaled asphalt pavement structure 3, and a circulating temperature-controlled heat sink 6, a watering nozzle 7, a ventilation fan blade 8 and a group of temperature sensors 4 and a relative humidity sensor 5 are arranged on the top of the scaled asphalt pavement structure 3. A temperature sensor 4 and a relative humidity sensor 5 are arranged on each layer of the scaled asphalt pavement structure 3, and a circulating temperature-controlled curved pipe 9 and a seepage pipe 10 are arranged at the bottom of the scaled asphalt pavement structure 3; finally, the above-mentioned whole is wrapped and supported by a supporting frame 1.

[0070] The test process using the above device is as follows:

[0071] (1) Simulating natural foundation conditions:

[0072] The temperature distribution state of the actual asphalt pavement structure during the summer noon period is selected as the simulation object of the natural basic working condition. The temperature data of the soil roadbed and the temperature data of the road surface air of the actual asphalt pavement structure are obtained by consulting the data or monitoring by sensors, which are 15°C and 45°C respectively; the temperature of the circulating temperature control elbow 9 of the test device of the present invention is adjusted to 15°C, and the temperature of the top circulating temperature control heat sink 6 is adjusted to 45°C, and the temperature change process law and waiting time of the scaled asphalt pavement structure 3 reaching temperature equilibrium as a whole are recorded, and the natural basic working condition of simulating the temperature distribution state of the actual asphalt pavement structure during the summer noon period can be realized.

[0073] (2) Simulating standard control conditions:

[0074] According to the above test process (1), the overall temperature distribution state of the scaled asphalt pavement structure 3 of the test device of the present invention is first adjusted to simulate the natural basic working condition of the temperature distribution state of the actual asphalt pavement structure during the summer noon period. At this time, the temperatures of the bottom soil base 34 and the top road surface air are 15°C and 45°C respectively; it is planned to carry out high temperature control research based on this natural basic working condition, and adjust the temperature of the top circulating temperature control heat sink 6 of the test device of the present invention to 60°C, and record the temperature change process law and waiting time of the scaled asphalt pavement structure 3 reaching temperature equilibrium as a whole.

[0075] (3) Simulating non-standard control conditions:

[0076] According to the above test process (1), the overall temperature distribution state of the scaled asphalt pavement structure 3 of the test device of the present invention is first adjusted to simulate the natural basic working condition of the temperature distribution state of the actual asphalt pavement structure during the summer noon period. At this time, the temperatures of the bottom soil base 34 and the top road surface air are 15°C and 45°C respectively; it is planned to carry out low-temperature control research based on this natural basic working condition, and at the same time, the temperatures of the bottom circulating temperature control elbow 9 and the top circulating temperature control heat sink 6 of the test device of the present invention are adjusted to -10°C and -20°C respectively, so as to further simulate the non-standard control working condition of severe winter weather on the basis of the natural basic working condition of hot summer weather, and record the temperature change process law and waiting time for the scaled asphalt pavement structure to reach temperature equilibrium as a whole.

[0077] (4) Simulating water-related regulation conditions:

[0078] According to the above test process (1), the overall temperature distribution state of the scaled asphalt pavement structure 3 of the test device of the present invention is first adjusted to simulate the natural basic working condition of the temperature distribution state of the actual asphalt pavement structure during the summer noon period. At this time, the temperatures of the bottom soil base 34 and the top road surface air are 15°C and 45°C respectively, and the overall relative humidity inside the scaled asphalt pavement structure 3 is 70%; it is planned to carry out a study on the regulation of relative humidity increase based on this natural basic working condition, open the top water spray nozzle 7 of the test device alone, regulate the relative humidity of the top space to 100%, and record the humidity change process law and waiting time for the scaled asphalt pavement structure 3 to reach relative humidity equilibrium as a whole; after the humidity is balanced, further regulate the temperature of the top circulating temperature control heat sink 6 of the test device to 60°C, and record the relative humidity change process law and waiting time at different temperatures.

[0079] In actual experiments, a typical full-scale accelerated loading asphalt pavement straight test road has a horizontal dimension of 12m. 4.5m, by regulating the infrared heating tubes and the circulating fans on both sides of the large environmental box located on the surface of the test road, the effective regulation of the service temperature of the road surface can be achieved, wherein the power of the infrared heating tubes and the circulating fans on both sides working together is 135kW. The test device of the present invention can achieve effective regulation of the service temperature of the top space of the scaled asphalt pavement structure 3 by regulating the circulating temperature control heat sink 6 and the ventilation fan blades 8, wherein the power of the circulating temperature control heat sink 6 and the ventilation fan blades 8 working together is 1.8kW. Under the basic condition of natural air temperature of 23°C, the regulation makes the road surface air temperature of the full-scale accelerated loading asphalt pavement straight test road and the scaled asphalt pavement structure 3 of the test device of the present invention reach 30°C. The actual measurement by the sensor shows that the time required for the two is 1 hour and 15 minutes and 20 minutes respectively, and the corresponding energy consumption of the two is 168.75kWh and 0.6kWh respectively. Obviously, by only regulating the road surface air temperature to rise slightly, the test device of the present invention can effectively achieve the regulation of the specified service environment temperature quickly and with low energy consumption compared with the large full-scale accelerated loading test device.

[0080] According to the above method, the present invention can be well implemented. By quickly adjusting the temperature and humidity parameters of the scaled asphalt pavement structure composed of test pieces indoors, it is possible to conveniently and effectively simulate the basic laws of temperature and humidity balance when the actual asphalt pavement changes from natural basic working conditions to specified standard or non-standard working conditions and accumulate basic test data, which greatly reduces the energy consumption and cost required for the test, and lays the foundation for the formulation of a specified temperature and humidity environment control scheme in a full-scale accelerated loading experiment. The above specific implementation methods are only preferred implementation methods of the present invention, and are not intended to limit the scope of implementation of the present invention (for example, the scaled asphalt pavement structure can be composed of different materials and different thicknesses; increasing the number of circulating temperature control elbows at the bottom of the test device can achieve faster temperature control; the temperature control method at the top of the test device can also use a heating resistor wire combined with an air conditioning refrigeration device to achieve high and low temperature control. The present invention only presents the simplest method of circulating temperature control fins). Accordingly, all modifications made in accordance with the content of the present invention, such as adjusting the type and size of the pavement structure, the number of circulating temperature control elbows, and the form of temperature and humidity control, are covered by the scope of protection required by the claims of the present invention.

[0081] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A test method for the internal and external temperature and humidity balance of a scaled asphalt pavement structure, characterized in that: The method uses a scaled asphalt pavement structure internal and external temperature and humidity balance test device to conduct the following test: (1) Simulating natural foundation conditions: By regulating the bottom circulating temperature control elbow and the top circulating temperature control heat sink of the test device, the temperature parameters at the bottom and top of the scaled asphalt pavement structure are respectively set to be consistent with the temperature state of the soil roadbed and road surface air of the actual asphalt pavement structure under the specified natural foundation working condition, and the temperature change process and waiting time of the scaled asphalt pavement structure reaching temperature equilibrium as a whole are recorded to achieve simulation of the natural foundation working condition; (2) Simulating standard control conditions: After reaching the specified natural foundation working condition, according to the experimental requirements, the temperature of the circulating temperature control heat sink on the top of the test device is adjusted, and the temperature change process and waiting time for the scaled asphalt pavement structure to reach temperature equilibrium as a whole are recorded; (3) Simulating non-standard control conditions: After reaching the specified natural foundation working condition, according to the experimental requirements, the temperature of the bottom circulation temperature control elbow and the top circulation temperature control heat sink of the test device are adjusted at the same time, and the temperature change process law and waiting time for the scaled asphalt pavement structure to reach temperature equilibrium as a whole are recorded; (4) Simulation of water-related regulation conditions: After reaching the specified natural basic working conditions, according to the experimental requirements, the bottom seepage pipe and the top water spray nozzle of the test device are adjusted separately or simultaneously, and the humidity change process and waiting time for the scaled asphalt pavement structure to reach relative humidity equilibrium as a whole are recorded. After the humidity is balanced, the temperature of the bottom circulating temperature control elbow and the top circulating temperature control heat sink of the test device is further adjusted, and the relative humidity change process and waiting time at different temperatures are recorded.

2. The test method for the internal and external temperature and humidity balance of a scaled asphalt pavement structure according to claim 1 is characterized in that: The test device is composed of a temperature and moisture insulation support frame, an environmental control system, a scaled asphalt pavement structure and a sensor monitoring system; The thermal insulation and moisture insulation support frame is composed of a support frame and a thermal insulation and moisture insulation layer. The environmental control system is composed of circulating temperature control radiator, water spray nozzle, ventilation fan blade, circulating temperature control elbow and seepage pipe. The sensor monitoring system consists of a temperature sensor and a relative humidity sensor; The support frame is located at the outermost side of the whole test device and provides support. The thermal and moisture insulation layer is close to the edge of the scaled asphalt pavement structure to ensure that the gradient difference of temperature and humidity can only be transmitted from top to bottom and from bottom to top within the scaled asphalt pavement structure. There is a reserved space between the upper part of the scaled asphalt pavement structure and the thermal and moisture-insulating layer, a circulating temperature-control heat sink is installed on the top of the reserved space, a water spray nozzle is installed in the center of the top of the reserved space, a ventilation fan blade is installed on the side wall of the reserved space, and a group of temperature sensors and relative humidity sensors are installed in the reserved space; a circulating temperature-control elbow is installed at the bottom of the scaled asphalt pavement structure close to the bottom surface of the scaled asphalt pavement structure, and a seepage pipe is installed at the bottom of the circulating temperature-control elbow; The temperature sensor and the relative humidity sensor are arranged on the surface of each layer of the scaled asphalt pavement structure along the vertical direction.

3. The test method for the internal and external temperature and humidity balance of a scaled asphalt pavement structure according to claim 1 is characterized in that: The natural basic working condition refers to the natural temperature state of the actual asphalt pavement structure within the structural thickness range from the soil roadbed to the road surface air in different seasons of the year and different times of the day. During the experiment, the actual asphalt pavement structure temperature state of a period of time is selected as the specified natural basic working condition.

4. The test method for the internal and external temperature and humidity balance of a scaled asphalt pavement structure according to claim 1 is characterized in that: The standard control condition refers to that the scaled asphalt pavement structure has reached the natural basic condition of internal and external temperature balance, and only the temperature parameters of the road surface air are changed, so that the scaled asphalt pavement structure gradually reaches the overall temperature balance from the top to the bottom; The non-standard control condition refers to that the scaled asphalt pavement structure, on the basis of the natural basic condition that the internal and external temperature balance has been achieved, simultaneously increases or decreases the temperature parameters of the earth roadbed and the road surface air, so that the scaled asphalt pavement structure gradually achieves overall temperature balance from top to bottom and from bottom to top.

5. The test method for the internal and external temperature and humidity balance of a scaled asphalt pavement structure according to claim 1 is characterized in that: The water-related control condition refers to changing the relative humidity parameters of the soil roadbed and road surface air of the scaled asphalt pavement structure on the basis of any of the natural foundation work, the standard control condition and the non-standard control condition, so that the scaled asphalt pavement structure as a whole gradually reaches a relative humidity balance.

6. The test method for the internal and external temperature and humidity balance of a scaled asphalt pavement structure according to claim 2 is characterized in that: The scaled asphalt pavement structure is consistent with the material settings of each layer of the actual full-scale asphalt pavement structure, and is composed of an asphalt surface layer, a cement-stabilized crushed stone base layer, a fly ash-stabilized crushed stone base layer and a soil base layer; The length and width of the scaled asphalt pavement structure are not less than 30 cm, and the height is not less than 1 m.

7. The test method for the internal and external temperature and humidity balance of a scaled asphalt pavement structure according to claim 2 is characterized in that: The temperature sensor and the relative humidity sensor in the scaled asphalt pavement structure are symmetrically arranged in the middle of each layer surface of the scaled asphalt pavement structure in the horizontal direction, and the cables are led out through the lead holes.

8. The test method for the internal and external temperature and humidity balance of a scaled asphalt pavement structure according to claim 2 is characterized in that: The height of the reserved space is 10-30 cm, and the circulating temperature-control radiator covers the top of the reserved space; A group of temperature sensors and relative humidity sensors in the reserved space are installed at 1 / 2 of the height of the reserved space and are installed on the side wall; The distance between the seepage pipe and the circulating temperature-controlling curved pipe is 3-10 cm, and the distance between the seepage pipe and the bottom temperature-insulating and moisture-isolating layer is 3-10 cm.

9. The test method for the internal and external temperature and humidity balance of a scaled asphalt pavement structure according to claim 2 is characterized in that: The temperature control range of the test device is -30°C~100°C, the relative humidity control range is 0~100%RH, the water seepage control range is 0~0.5L / min, and the water spraying control range is 0~10mm / h.

10. The test method for internal and external temperature and humidity balance of scaled asphalt pavement structure according to claim 2, characterized in that: The thickness of the temperature and moisture insulation layer ranges from 5 cm to 10 cm.

Images