Device for measuring thermophysical properties of steel slag aggregate and asphalt mixture

Abstract

The utility model relates to a thermophysical property measuring device for a steel slag aggregate and an asphalt mixture, and belongs to the technical field of engineering machinery. The measuring device comprises a device body, a heat conduction oil temperature sensor, a temperature controller, a device body heat preservation upper cover, a heating groove, heat conduction oil and a U-shaped heating pipe. The device body comprises an innermost layer box body, a first heat preservation and insulation layer, a middle layer box body, a second heat preservation and insulation layer and an outermost layer box body which are sequentially arranged from inside to outside. The device further comprises an NTC temperature transmitter, a temperature sensor probe and a signal line. The device is novel in structure and convenient to use, steel slag aggregates, asphalt mixtures and other tested pieces can be measured through the device, and a measurer can calculate according to the measurement result of the device, so that thermophysical parameters of the tested pieces are obtained; the method has the advantages of simple and fast operation, high test precision and the like, and has good social and economic benefits and application prospects.

Description

Technical Field

[0001] This utility model belongs to the field of engineering machinery technology, specifically relating to a device for measuring the thermal properties of steel slag aggregate and asphalt mixture. Background Technology

[0002] As a temperature-sensitive material, asphalt mixtures are significantly affected by ambient temperature in terms of road performance. Rutting, cracking, and other temperature-related pavement defects under high and low temperature environments severely impact the performance and service life of asphalt pavements. Besides the influence of external ambient temperature, the thermophysical properties of the asphalt mixture itself directly affect the heat transfer rate and temperature changes of asphalt pavements, and are also important parameters in the calculation and analysis of temperature fields and temperature stresses in asphalt pavements. Existing research on the thermophysical properties of asphalt mixtures has mostly focused on ordinary asphalt mixtures. However, steel slag asphalt mixtures contain a certain amount of steel slag as aggregate. Steel slag has a complex composition, is highly porous both internally and externally, and contains some metallic elements. Metals are excellent heat transfer media, which makes the heating and cooling rates of steel slag asphalt mixtures significantly different from those of traditional asphalt mixtures. Therefore, it is essential to conduct research on the thermophysical properties of steel slag asphalt mixtures and analyze the influencing factors.

[0003] Currently, the commonly used methods for testing the thermophysical properties of asphalt mixtures are the protective plate method and the mixing method. The protective plate method is based on the principle of steady-state heat transfer in a plane and studies the thermal conductivity of asphalt mixture specimens, while the mixing method is based on the principle of heat exchange equilibrium and studies the specific heat capacity of asphalt mixture specimens. However, both methods simulate the influencing factors and changes in thermal conductivity and specific heat capacity of a pre-paved road surface at natural temperatures, and cannot measure the heating of raw materials and the cooling of the mixture during construction. Currently, there are also no devices available for auxiliary measurement of the thermophysical properties of raw materials (such as steel slag aggregate and asphalt mixture) during construction. Therefore, overcoming the shortcomings of existing technologies is a pressing problem in the field of engineering machinery technology. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies and provide a device for measuring the thermal properties of steel slag aggregates and asphalt mixtures.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A device for measuring the thermal properties of steel slag aggregate and asphalt mixture includes a device body, a heat transfer oil temperature sensor, a temperature controller, a heat-insulating cover for the device body, a heating tank, heat transfer oil, and a U-shaped heating tube.

[0007] The device body includes, from the inside out, an innermost box, a first thermal insulation layer, a middle box, a second thermal insulation layer, and an outermost box.

[0008] A heating groove is fixedly provided at the center of the upper part of the device body;

[0009] There is heat transfer oil between the device body and the heating tank;

[0010] A U-shaped heating tube is fixedly connected to the lower part of the device body;

[0011] A heat transfer oil temperature sensor is fixedly connected to the side wall inside the device body, and the heat transfer oil temperature sensor is located in the heat transfer oil.

[0012] The device body is detachably connected to an insulated top cover.

[0013] The main body of the device has a through hole in the middle of the heat-insulating top cover, and a heating groove heat-insulating top cover is provided at the through hole;

[0014] The heating tank insulation cover is placed on the heating tank and is detachably connected to the heating tank;

[0015] It also includes an NTC temperature transmitter, a temperature sensor probe, and signal lines;

[0016] The output of the temperature sensor probe is connected to one end of the signal line; the other end of the signal line is connected to the input of the NTC temperature transmitter.

[0017] Temperature sensor probe insertion holes are provided on both sides and in the center of the heating tank insulation cover;

[0018] The temperature controller is connected to the heat transfer oil temperature sensor and the U-shaped heating tube, respectively.

[0019] Furthermore, preferably, the innermost, middle, and outermost boxes are all made of aluminum alloy and are all rectangular in shape.

[0020] Furthermore, preferably, the thickness of both the first thermal insulation layer and the second thermal insulation layer is mm.

[0021] Furthermore, preferably, both the first and second thermal insulation layers are made of aluminum silicate needled blanket.

[0022] Furthermore, preferably, the temperature controller is fixed to the outer wall of the device body.

[0023] Furthermore, preferably, the temperature sensor probe is a K-type thermocouple temperature sensor.

[0024] In this utility model, the device body includes an innermost box, a first thermal insulation layer, a middle box, a second thermal insulation layer, and an outermost box arranged sequentially from the inside to the outside. Specifically, the innermost box is fixedly connected to the first thermal insulation layer, the first thermal insulation layer is fixedly connected to the middle box, the middle box is fixedly connected to the second thermal insulation layer, and the second thermal insulation layer is fixedly connected to the outermost box.

[0025] In this invention, the U-shaped heating tube is used to heat the heat transfer oil; the heat transfer oil temperature sensor is used to measure the temperature of the heat transfer oil.

[0026] Preferably, in this invention, the output terminal of the NTC temperature transmitter is connected to a computer.

[0027] In this invention, the temperature controller obtains the temperature of the heat transfer oil through a heat transfer oil temperature sensor; the temperature controller controls the heating and stopping of the U-shaped heating tube to heat the heat transfer oil. By obtaining the temperature of the heat transfer oil in real time, the heat transfer oil is heated to the target temperature for the test through the U-shaped heating tube.

[0028] In this invention, the test specimen includes steel slag aggregate and asphalt mixture; the test specimen is preferably a cylindrical specimen of 100mm×25mm×25mm, used to determine the specific heat capacity; it can also be a plate-shaped specimen of 100mm×100mm×50mm, used to determine the thermal conductivity.

[0029] In this invention, the first and second thermal insulation layers serve to provide thermal insulation, thereby reducing heat loss during the testing process.

[0030] In this invention, the temperature sensor probe insertion hole is used for inserting the temperature sensor probe to facilitate temperature measurement.

[0031] In this invention, there are no restrictions on the display instrument connected to the output terminal of the NTC temperature transmitter; it can be a conventional secondary instrument or a computer.

[0032] Compared with the prior art, the advantages of this utility model are as follows:

[0033] This invention provides a thermophysical property measuring device for steel slag aggregate and asphalt mixture. The device has a novel structure and is easy to use. It can be used to measure test specimens such as steel slag aggregate and asphalt mixture. The measurer can use the measurement results to calculate the thermophysical parameters of the test specimen. This invention has the advantages of simple and fast operation and high testing accuracy, and has good social and economic benefits and application prospects. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0035] Figure 1 A schematic diagram of the structure of a thermophysical property measuring device for steel slag aggregate and asphalt mixture;

[0036] Figure 2 Another schematic diagram of a device for measuring the thermophysical properties of steel slag aggregates and asphalt mixtures;

[0037] Figure 3 The graph shows the temperature change of the test specimen and distilled water over time.

[0038] Figure 4 This is a graph showing the temperature changes of the cold plate and hot plate in the test piece over time.

[0039] The components are as follows: 1. Outermost housing; 2. Middle housing; 3. Temperature sensor probe insertion hole; 4. Innermost housing; 5. Heat transfer oil temperature sensor; 6. Temperature controller; 7. NTC temperature transmitter; 8. Heating tank insulation cover; 9. Device body insulation cover; 10. Heating tank; 11. Distilled water; 12. Temperature sensor probe; 13. Test piece; 14. Heat transfer oil; 15. U-shaped heating tube; 16. First insulation layer; 17. Second insulation layer; 18. Signal line; 19. Computer. Detailed Implementation

[0040] The present invention will be further described in detail below with reference to the embodiments.

[0041] Those skilled in the art will understand that the following embodiments are for illustrative purposes only and should not be construed as limiting the scope of the present invention. Where specific techniques, connections, or conditions are not specified in the embodiments, they are performed in accordance with the techniques, connections, or conditions described in the literature in the field or according to the product instructions. Materials, instruments, or equipment used without specified manufacturers are all conventional products that can be obtained through purchase.

[0042] Those skilled in the art will understand that, unless specifically stated otherwise, the singular forms “a,” “an,” “the,” and “the” used herein may also include the plural forms. It should be further understood that the term “comprising” as used in this specification means the presence of the stated features, integers, steps, operations, elements, and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof. It should be understood that when we say an element is “connected” or “coupled” to another element, it can be directly connected or coupled to the other element, or there may be intermediate elements. Furthermore, “connected” or “coupled” as used herein can include wireless connections or couplings. The term “and / or” as used herein includes any and all combinations of one or more of the associated listed items.

[0043] In the description of this utility model, unless otherwise stated, "a plurality of" means two or more. The terms "inner," "upper," "lower," etc., indicate the orientation or state relationship based on the orientation or state relationship shown in the drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0044] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "equipped with" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art will understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0045] It will be understood by those skilled in the art that, unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. It should also be understood that terms such as those defined in general dictionaries should be understood to have the same meaning as in the context of the prior art, and should not be interpreted in an idealized or overly formal sense unless defined as herein.

[0046] The K-type thermocouple temperature sensor used in this invention preferably has an acquisition accuracy of 0.1℃, a range of -30℃ to 200℃, and a tolerance of ±(0.3+0.005|t|); preferably, it uses the Pt100 type temperature sensor from Shanghai Songdao Heating Sensor Co., Ltd.

[0047] The NTC temperature transmitter 7 is preferably an 8-channel RS485 communication temperature acquisition transmitter, and preferably uses the ZhongSheng Technology NTC thermistor isolated temperature acquisition module.

[0048] The preferred temperature controller 6 is the PID 4-channel R485 temperature controller manufactured by Guangzhou Longsheng Electronic Technology Co., Ltd.

[0049] The preferred thermal oil temperature sensor is the Pt100 type temperature sensor from Shanghai Songdao Heating Sensor Co., Ltd.

[0050] Example 1

[0051] like Figure 1 As shown, a device for measuring the thermal properties of steel slag aggregate and asphalt mixture includes a device body, a heat transfer oil temperature sensor 5, a temperature controller 6, a heat-insulating cover 9 for the device body, a heating tank 10, heat transfer oil 14, and a U-shaped heating tube 15.

[0052] The device body includes, from the inside out, an innermost box 4, a first thermal insulation layer 16, a middle box 2, a second thermal insulation layer 17, and an outermost box 1.

[0053] A heating groove 10 is fixedly provided at the center of the upper part of the device body;

[0054] There is heat transfer oil 14 between the device body and the heating tank 10;

[0055] A U-shaped heating tube 15 is fixedly connected to the lower part of the device body;

[0056] A heat transfer oil temperature sensor 5 is fixedly connected to the side wall inside the device body, and the heat transfer oil temperature sensor 5 is located in the heat transfer oil 14.

[0057] The device body is detachably connected to an insulated top cover 9;

[0058] The main body of the device has a through hole in the middle of the heat-insulating top cover 9, and a heating groove heat-insulating top cover 8 is provided at the through hole;

[0059] The heating tank insulation cover 8 covers the heating tank 10 and is detachably connected to the heating tank 10;

[0060] It also includes an NTC temperature transmitter 7, a temperature sensor probe 12, and a signal line 18;

[0061] The output terminal of the temperature sensor probe 12 is connected to one end of the signal line 18; the other end of the signal line 18 is connected to the input terminal of the NTC temperature transmitter 7.

[0062] Temperature sensor probe insertion holes 3 are provided on both sides and in the center of the heating tank insulation cover 8;

[0063] Temperature controller 6 is connected to heat transfer oil temperature sensor 5 and U-shaped heating tube 15 respectively.

[0064] Example 2

[0065] like Figure 1 As shown, a device for measuring the thermal properties of steel slag aggregate and asphalt mixture includes a device body, a heat transfer oil temperature sensor 5, a temperature controller 6, a heat-insulating cover 9 for the device body, a heating tank 10, heat transfer oil 14, and a U-shaped heating tube 15.

[0066] The device body includes, from the inside out, an innermost box 4, a first thermal insulation layer 16, a middle box 2, a second thermal insulation layer 17, and an outermost box 1.

[0067] A heating groove 10 is fixedly provided at the center of the upper part of the device body;

[0068] There is heat transfer oil 14 between the device body and the heating tank 10;

[0069] A U-shaped heating tube 15 is fixedly connected to the lower part of the device body;

[0070] A heat transfer oil temperature sensor 5 is fixedly connected to the side wall inside the device body, and the heat transfer oil temperature sensor 5 is located in the heat transfer oil 14.

[0071] The device body is detachably connected to an insulated top cover 9;

[0072] The main body of the device has a through hole in the middle of the heat-insulating top cover 9, and a heating groove heat-insulating top cover 8 is provided at the through hole;

[0073] The heating tank insulation cover 8 covers the heating tank 10 and is detachably connected to the heating tank 10;

[0074] It also includes an NTC temperature transmitter 7, a temperature sensor probe 12, and a signal line 18;

[0075] The output terminal of the temperature sensor probe 12 is connected to one end of the signal line 18; the other end of the signal line 18 is connected to the input terminal of the NTC temperature transmitter 7.

[0076] Temperature sensor probe insertion holes 3 are provided on both sides and in the center of the heating tank insulation cover 8;

[0077] Temperature controller 6 is connected to heat transfer oil temperature sensor 5 and U-shaped heating tube 15 respectively.

[0078] The innermost box 4, the middle box 2, and the outermost box 1 are all made of aluminum alloy and are all rectangular.

[0079] The thickness of both the first thermal insulation layer 16 and the second thermal insulation layer 17 is 15mm.

[0080] The first thermal insulation layer 16 and the second thermal insulation layer 17 are both made of aluminum silicate needled blanket.

[0081] The temperature controller 6 is fixed on the outer wall of the device body.

[0082] Temperature sensor probe 12 is a K-type thermocouple temperature sensor.

[0083] Example 3

[0084] like Figure 2 As shown, a device for measuring the thermal properties of steel slag aggregate and asphalt mixture includes a device body, a heat transfer oil temperature sensor 5, a temperature controller 6, a heat-insulating cover 9 for the device body, a heating tank 10, heat transfer oil 14, and a U-shaped heating tube 15.

[0085] The device body includes, from the inside out, an innermost box 4, a first thermal insulation layer 16, a middle box 2, a second thermal insulation layer 17, and an outermost box 1.

[0086] A heating groove 10 is fixedly provided at the center of the upper part of the device body;

[0087] There is heat transfer oil 14 between the device body and the heating tank 10;

[0088] A U-shaped heating tube 15 is fixedly connected to the lower part of the device body;

[0089] A heat transfer oil temperature sensor 5 is fixedly connected to the side wall inside the device body, and the heat transfer oil temperature sensor 5 is located in the heat transfer oil 14.

[0090] The device body is detachably connected to an insulated top cover 9;

[0091] The main body of the device has a through hole in the middle of the heat-insulating top cover 9, and a heating groove heat-insulating top cover 8 is provided at the through hole;

[0092] The heating tank insulation cover 8 covers the heating tank 10 and is detachably connected to the heating tank 10;

[0093] It also includes an NTC temperature transmitter 7, a temperature sensor probe 12, and a signal line 18;

[0094] The output terminal of the temperature sensor probe 12 is connected to one end of the signal line 18; the other end of the signal line 18 is connected to the input terminal of the NTC temperature transmitter 7.

[0095] Temperature sensor probe insertion holes 3 are provided on both sides and in the center of the heating tank insulation cover 8;

[0096] Temperature controller 6 is connected to heat transfer oil temperature sensor 5 and U-shaped heating tube 15 respectively.

[0097] The innermost box 4, the middle box 2, and the outermost box 1 are all made of aluminum alloy and are all rectangular.

[0098] The thickness of both the first thermal insulation layer 16 and the second thermal insulation layer 17 is 15mm.

[0099] The first thermal insulation layer 16 and the second thermal insulation layer 17 are both made of aluminum silicate needled blanket.

[0100] The temperature controller 6 is fixed on the outer wall of the device body.

[0101] Temperature sensor probe 12 is a K-type thermocouple temperature sensor.

[0102] The NTC temperature transmitter 7 is connected to the computer 19, which acquires and displays the temperature detected by the temperature sensor probe 12 in real time.

[0103] Temperature controller 6 acquires the temperature of heat transfer oil 14 via heat transfer oil temperature sensor 5; temperature controller 6 controls the heating and stopping of U-shaped heating tube 15 to heat heat transfer oil 14. By acquiring the temperature of heat transfer oil 14 in real time, the U-shaped heating tube 15 heats heat transfer oil 14 to the target temperature for testing. During the heating process, the heat insulation cover 9 of the device body remains installed on the device body;

[0104] The heating tank 10 is located in the heat transfer oil, which can heat the test piece 13 inside the heating tank 10. If a liquid medium, such as distilled water 11, is added to the heating tank 10, then the distilled water 11 inside the heating tank 10 can also be heated. This utility model does not limit the specific connection method between the heating tank 10 and the device body, as long as the heating tank 10 is fixedly located at the center of the upper part of the device body.

[0105] Temperature sensor probe insertion holes 3 are provided on both sides and in the center of the heating bath insulation cover 8 for inserting temperature sensor probes 12 to facilitate temperature measurement. For example, when conducting a specific heat capacity test, temperature is measured using temperature sensor probe insertion holes 3 on both sides and in the center to check whether a stable equilibrium temperature has been reached; as another example, when conducting a thermal conductivity test, the temperature change on both sides of the test piece 13 is measured within 5 minutes through the temperature sensor probe insertion holes 3 on both sides of the heating bath insulation cover 8.

[0106] (I) When using the device of this utility model to test specific heat capacity, the testing principle is as follows: Specific heat capacity refers to the ratio of the heat absorbed by a certain mass of a material when the temperature rises to the product of its mass and the temperature rise. It is a parameter for evaluating the amount of energy stored in a material. The specific operating method is as follows:

[0107] (1) Preparation of test specimen 13: Before the test begins, the steel slag asphalt mixture rutting specimen is formed according to the actual requirements. The specimen is cut into a sample with a length × width × thickness of 100mm × 25mm × 25mm as the test specimen 13. Then, a small hole with a diameter of 6mm and a depth of 50mm is drilled at the center of the 25mm × 25mm cross section. The small hole is filled with thermal conductive silicone grease and its mass is weighed as m1. Then, the temperature sensor probe 12 is inserted into the small hole immediately after passing through the heating tank insulation cover 8. After wiping off the excess silicone grease (because the hole is filled with silicone grease first, there will be excess silicone grease flowing out after inserting the temperature sensor probe 12, so it must be wiped clean), it is placed in an environment with a temperature of t1 (the temperature of the indoor environment) for at least 2 hours.

[0108] (2) Pour distilled water 11 with a mass of m2 into the heating tank 10. The specific heat capacity of the distilled water is a known quantity c2. Note that the distilled water should not be filled directly (because the test piece will be added to the water later, and filling it directly will cause it to overflow). Adjust the temperature controller 6 to heat the distilled water and keep the temperature constant at t2.

[0109] (3) Immerse the sample with mass m1 and temperature t1 into distilled water with mass m2, temperature t2, and specific heat capacity c2. Immediately cover the heating tank with the heat preservation cover 8 and wait for the two to reach a stable equilibrium temperature t. x The test can then be terminated; in actual testing, if the temperature change does not exceed 1℃ within 5 minutes, it can be considered that a stable equilibrium temperature t has been reached. x For a certain test piece 13, its temperature change with distilled water over time is shown in the graph below. Figure 3 As shown, when 600s, the temperature change did not exceed 1℃ in the following 5 minutes. Therefore, it is considered that the equilibrium temperature of 65℃ was reached at 600s.

[0110] (4) Calibrate the heat loss. Because the time required for the temperature to reach equilibrium during the test is relatively long, not all the heat released by the distilled water during cooling can be absorbed by the specimen. To obtain this heat loss Q... sIt is recommended to use brass or other media with a known specific heat capacity of c0 and mass of m0 to conduct the test under the same conditions. This will allow us to obtain the heat absorbed by the brass during heating: Q1 = c0 × m0 × ΔT, and the heat released by the water during cooling: Q2 = c2 × m2 × ΔT. Under ideal testing conditions, Q1 = Q0 should always hold true. However, in actual testing, some heat loss is unavoidable. Therefore, the difference between Q1 and Q2 is taken as the heat lost during the test: Q. s Specifically: Q s =Q2-Q1.

[0111] (5) Calculate the specific heat capacity c of the test piece 13. The specific calculation formula is as follows:

[0112]

[0113] It should be noted that the above calculation process can be performed manually or by computer, and this utility model does not limit this, nor is the calculation process protected by this utility model. All the principles described are existing principles, and this utility model does not improve upon them, nor are these principles protected by this utility model.

[0114] (II) When using this utility model device to test thermal conductivity, the testing principle is as follows: Thermal conductivity refers to the amount of heat directly conducted by a material per unit cross-section and length under a unit temperature difference and per unit time; it evaluates the material's ability to directly conduct heat. The higher the thermal conductivity, the stronger the surface thermal conductivity. The specific operating method is as follows:

[0115] (1) Preparation of test specimen 13: Before the test begins, the steel slag asphalt mixture rutting specimen is formed according to the actual requirements. The specimen is cut into a plate-shaped sample with a length × width × thickness of 100mm × 100mm × 50mm as the test specimen 13. After weighing the mass m of the test specimen 13, the test specimen 13 is wrapped tightly with thermal insulation cotton.

[0116] (2) Take a regular aluminum alloy plate with a length × width of 100mm × 100mm, and attach a temperature sensor patch to the center of the plate to use as a cold plate.

[0117] (3) Adjust the temperature controller 6 to heat the heat transfer oil so that the temperature of the bottom plate (as a hot plate) of the heating tank 10 is constant at t3. Then place the test piece 13 with a thickness of L, a bottom area of ​​A, and a mass of m on the bottom plate (as a hot plate) of the heating tank 10, immediately cover it with the above-mentioned cold plate, and record the initial temperature of the cold plate t4, and start recording the time at the same time.

[0118] (4) When the temperature change on both sides of the test piece 13 does not exceed 1℃ within 5 minutes, it is considered to have reached a steady state. Record the temperature t5 of the cold plate and the time h after reaching the steady state. For a certain test piece 13, the temperature changes of its hot and cold plates are as follows: Figure 4 As shown, when the temperature reaches 540s, the temperature change does not exceed 1℃ in the following 5 minutes. Therefore, it is considered that a steady state is reached at 540s, at which point the cold plate temperature is 50℃.

[0119] (5) Calculate the heat flow rate Qx through the test piece 13. The specific calculation formula is as follows:

[0120]

[0121] (6) Calculate the thermal conductivity k of the test piece 13. The specific calculation formula is as follows:

[0122]

[0123] It should be noted that the above calculation process can be performed manually or by computer, and this utility model does not limit this, nor is the calculation process protected by this utility model. All the principles described are existing principles, and this utility model does not improve upon them, nor are these principles protected by this utility model.

[0124] (III) When using the device of this utility model to test the thermal diffusivity, the testing principle is as follows: The thermal diffusivity is one of the important parameters describing the thermal conductivity of a material, measuring the rate at which heat diffuses within the material. The larger the thermal diffusivity, the stronger the ability of heat to diffuse through the interior, and the faster the material responds to changes in its thermal environment. Materials with a small thermal diffusivity require a longer time to reach a new equilibrium state. In thermodynamics, the thermal diffusivity of a material is the ratio of thermal conductivity to specific heat capacity. The specific operating method is as follows:

[0125] The specific heat capacity c of the test piece 13 is obtained by using the device of this invention to test the specific heat capacity; then the thermal conductivity k of the test piece is calculated by using the device of this invention; finally, the thermal diffusivity a is calculated using the following formula.

[0126] The specific calculation formula is as follows:

[0127] a = k / (ρ × c).

[0128] Wherein, ρ is the density of the test piece 13; this utility model does not limit the method of obtaining this density, and can use existing data or existing methods for measurement.

[0129] It should be noted that the above calculation process can be performed manually or by computer, and this utility model does not limit this, nor is the calculation process protected by this utility model. All the principles described are existing principles, and this utility model does not improve upon them, nor are these principles protected by this utility model.

[0130] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A device for measuring the thermal properties of steel slag aggregate and asphalt mixture, characterized in that, Includes the device body, heat transfer oil temperature sensor (5), temperature controller (6), device body heat insulation cover (9), heating tank (10), heat transfer oil (14), and U-shaped heating tube (15). The device body includes, from the inside out, the innermost box (4), the first thermal insulation layer (16), the middle box (2), the second thermal insulation layer (17), and the outermost box (1). A heating groove (10) is fixedly provided at the center of the upper part of the device body; There is heat transfer oil (14) between the device body and the heating tank (10); A U-shaped heating tube (15) is fixedly connected to the lower part of the device body; A heat transfer oil temperature sensor (5) is fixedly connected to the side wall inside the device body, and the heat transfer oil temperature sensor (5) is located in the heat transfer oil (14); The device body is detachably connected to the device body heat insulation cover (9); The main body of the device has a through hole in the middle of the heat-insulating top cover (9), and a heating groove heat-insulating top cover (8) is provided at the through hole. The heating tank insulation cover (8) covers the heating tank (10) and is detachably connected to the heating tank (10); It also includes an NTC temperature transmitter (7), a temperature sensor probe (12), and a signal line (18). The output terminal of the temperature sensor probe (12) is connected to one end of the signal line (18); the other end of the signal line (18) is connected to the input terminal of the NTC temperature transmitter (7); Temperature sensor probe insertion holes (3) are provided on both sides and in the center of the heating tank insulation cover (8). The temperature controller (6) is connected to the heat transfer oil temperature sensor (5) and the U-shaped heating tube (15) respectively.

2. The thermophysical property measuring device for steel slag aggregate and asphalt mixture according to claim 1, characterized in that, The innermost box (4), the middle box (2) and the outermost box (1) are all made of aluminum alloy and are all rectangular.

3. The thermophysical property measuring device for steel slag aggregate and asphalt mixture according to claim 1, characterized in that, The thickness of the first thermal insulation layer (16) and the second thermal insulation layer (17) is 15mm.

4. The thermophysical property measuring device for steel slag aggregate and asphalt mixture according to claim 1, characterized in that, The first thermal insulation layer (16) and the second thermal insulation layer (17) are both made of aluminum silicate needled blanket.

5. The thermophysical property measuring device for steel slag aggregate and asphalt mixture according to claim 1, characterized in that, The temperature controller (6) is fixed on the outer wall of the device body.

6. The thermophysical property measuring device for steel slag aggregate and asphalt mixture according to claim 1, characterized in that, The temperature sensor probe (12) is a K-type thermocouple temperature sensor.

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