A test device and method for evaluating asphalt content of asphalt mixture

Abstract

The application provides a test device for evaluating asphalt content of asphalt mixture, which comprises a drying box, a heater, a heating cylinder, a supporting plate, a driving motor, a rotating shaft, a controller and a rolling cylinder assembly, the driving motor, the supporting plate and the heating cylinder are arranged in the drying box, the controller is arranged on the drying box, the output end of the driving motor is connected with the rotating shaft, the heater is arranged on the supporting plate, the outer side of the heating cylinder is provided with the heater, and the rolling cylinder assembly is arranged in the heating cylinder; the heating is more uniform and stable, the rolling cylinder assembly is rotated by the driving motor, the bottom of the rolling cylinder assembly is connected with the driving motor, the top of the rolling cylinder assembly is connected with a supporting shaft sleeve, stable support is formed, the uniformity of stirring is improved, and the collected test data is more accurate. The application further discloses a test method for evaluating asphalt content of asphalt mixture, which judges the asphalt content of asphalt mixture by calculating the adhesion loss of the asphalt mixture, and the method is convenient, fast, has few interference factors and low cost.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of asphalt mixture testing equipment, in particular to a test device for evaluating the asphalt content of asphalt mixture and a method thereof. BACKGROUND

[0002] Asphalt is a black-brown complex mixture composed of hydrocarbons and non-metallic derivatives of different molecular weights, and is a kind of high-viscosity organic liquid, usually in the form of liquid or semi-solid petroleum, with black surface and soluble in carbon disulfide and carbon tetrachloride. Currently, when preparing asphalt mixture for road paving, the amount of asphalt needs to be tested,

[0003] However, the threshold value of asphalt content calculated by the thickness of asphalt oil film has limitations due to the different densities and water absorption rates of aggregates, and the oil film thickness itself is an empirical value. The threshold value of asphalt content determined by multiple variables and fuzzy values has limitations. Using "powder glue ratio" as one of the evaluation criteria has limitations because the powder glue ratio range is too wide, and the oil use of asphalt mixture is closely related to the physical properties and gradation combination of aggregates. The powder glue ratio cannot fully reflect these properties. In addition, when the Schrenk asphalt leakage test of asphalt mixture is used, the main equipment used in the test procedure is a beaker and an oven. The test accuracy is greatly affected by human factors due to the problem of static placement and manual loading of the sample, resulting in test errors.

[0004] A test device for evaluating the asphalt content of asphalt mixture is disclosed in the authorized announcement No. CN212060262U, which comprises a drying oven. A rotating device is provided on one side of the drying oven. A rotating rod is connected to the rotating device. One end of the rotating rod penetrates the side wall of the drying oven and extends into the drying oven. A drum is detachably connected to one end of the rotating rod. During rotation, the excess asphalt binder, fine aggregate, and mastic in the asphalt mixture sample can be in contact with the inner wall of the mixing barrel through continuous rotation. However, the device has three drums during the test. Each drum has unstable rolling and uneven heating of the heater on the drum, which leads to uneven asphalt mixing and affects the test factors. At the same time, it is not convenient to clean the asphalt on the drum after the test, which is difficult to clean and requires more time and manpower to clean. SUMMARY

[0005] The present application aims to solve at least one of the technical defects.

[0006] To this end, one object of the present application is to propose a test device for evaluating the asphalt content of asphalt mixture to solve the problems mentioned in the background art and overcome the deficiencies in the prior art.

[0007] In order to achieve the above-mentioned purpose, the present application provides a test device for evaluating asphalt content of asphalt mixture, which comprises a drying box, a heater, a heating cylinder, a support plate, a driving motor, a rotating shaft, a controller and a rolling cylinder assembly, the driving motor, the support plate and the heating cylinder are arranged in the drying box, the controller is arranged on the drying box, the output end of the driving motor is connected with the rotating shaft, the heater is arranged on the support plate, the outer side of the heating cylinder is provided with the heater, the rolling cylinder assembly is arranged in the heating cylinder, and the rolling cylinder assembly comprises an inner cylinder, a scraping frame and a rolling cylinder cover; the scraping frame is arranged in the inner cylinder, the rolling cylinder cover is detachably connected with the inner cylinder and the scraping frame, the bottom of the inner cylinder is provided with a shaft sleeve matched with the rotating shaft, a box cover is arranged on the drying box, a support sleeve is arranged on the inner side of the box cover, and a support shaft is arranged on the rolling cylinder cover; when the box cover is closed, the support shaft is matched with the support sleeve.

[0008] Preferably, the rolling cylinder assembly further comprises a threaded handle and a fixing plate, the threaded handle is fixedly connected with the support shaft and horizontally rotates relative to the support shaft, the outer side of the threaded handle is provided with a rotating external thread, the fixing plate is provided with a threaded hole matched with the rotating external thread, and the two ends of the fixing plate are respectively provided with fixing holes, and the inner cylinder is provided with fixing columns matched with the fixing holes.

[0009] Preferably in any of the above-mentioned solutions, the scraping frame is provided with a stud, the rolling cylinder cover is provided with a stud hole, the stud passes through the stud hole and fixes the rolling cylinder cover and the scraping frame together through a double-ear nut.

[0010] Preferably in any of the above-mentioned solutions, the bottom of the drying box is provided with an adjustable base, and the top of the drying box is provided with a level.

[0011] Preferably in any of the above-mentioned solutions, the bottom of the heating cylinder and the inner side wall of the box cover are respectively provided with temperature sensors.

[0012] Preferably in any of the above-mentioned solutions, the scraping frame comprises a scraping piece, a support rod and a fixing ring, and the support rod and the scraping piece are arranged at intervals in the circumferential direction of the fixing ring.

[0013] Preferably in any of the above-mentioned solutions, the driving motor is connected with the rotating shaft through a shaft coupling.

[0014] The present application also provides a test method of the test device for evaluating asphalt content of asphalt mixture, which comprises the following steps:

[0015] S1: paste filter paper on the inner cylinder wall, fix the scraping frame on the inner cylinder, cover the rolling cylinder cover on the inner cylinder, and weigh the mass M0 of the rolling cylinder assembly.

[0016] S2: weigh the mass m0 of the asphalt mixture before the test, open the rolling cylinder cover, pour the asphalt mixture into the inner cylinder, and then weigh the total mass M1 of the rolling cylinder assembly filled with the asphalt mixture.

[0017] Step S3: Put the rolling cylinder assembly containing the asphalt mixture into the heating cylinder, close the box cover, preheat the heating cylinder to the test temperature, set the rotation speed of the driving motor and the test time, and start the device.

[0018] Step S4: After the test is completed, the device is turned off, the rolling cylinder assembly is taken out, the mass m1 of the asphalt mixture poured out of the rolling cylinder assembly and the mass M2 of the rolling cylinder assembly after pouring out the asphalt mixture are weighed;

[0019] Step S5: Calculate the adhesion loss of the asphalt mixture:

[0020] Δm = (m0-m1) / m0*100 = (M2-M0) / (M1-M0)*100

[0021] Wherein, m0: the mass of the asphalt mixture before the test, unit g.

[0022] m1: the mass of the asphalt mixture poured out after the test, unit g.

[0023] M0: the mass of the rolling cylinder assembly before the test, unit g.

[0024] M1: the total mass of the rolling cylinder assembly and the asphalt mixture before the test, unit g.

[0025] M2: the mass of the rolling cylinder assembly after the test, unit g.

[0026] Δm: the adhesion loss of the asphalt mixture, unit %.

[0027] The asphalt content is determined according to the adhesion loss of the asphalt mixture.

[0028] Compared with the prior art, the advantages and beneficial effects of the present application are:

[0029] 1. The test device for evaluating the asphalt content of the asphalt mixture of the present application, the heating cylinder is arranged in the heater, the heater heats the rolling cylinder assembly through the heating cylinder, the heating is more uniform and stable, the driving motor drives the rolling cylinder assembly to rotate, the bottom of the rolling cylinder assembly is connected with the driving motor, and the top of the rolling cylinder assembly is connected with the support shaft sleeve, so that stable support is formed, the uniformity of stirring is improved, and the collected test data is more accurate.

[0030] 2. The test device for evaluating the asphalt content of the asphalt mixture of the present application, the rolling cylinder cover is detachably connected with the inner cylinder and the scraping frame, when the test is completed, the rolling cylinder assembly can be disassembled and cleaned, the cleaning is more convenient and labor-saving, and the cleaning time is reduced.

[0031] 3. The method of the present application is simple and practical, and does not require complex procedures, and has low requirements for test conditions and environment, and is stable and reliable, and is more rapid.

[0032] Additional aspects and advantages of the present application will be in part apparent and in part pointed out below. BRIEF DESCRIPTION OF DRAWINGS

[0033] The above and / or additional aspects and advantages of the present application will become apparent and be readily appreciated from the following description, including the appended drawings.

[0034] Figure 1 It is a structural schematic view of the test device for evaluating asphalt content of asphalt mixture according to the embodiment of the present application.

[0035] Figure 2 It is a structural schematic view of the test device for evaluating asphalt content of asphalt mixture according to the embodiment of the present application.

[0036] Figure 3 It is a structural schematic view of the rolling cylinder assembly of the test device for evaluating asphalt content of asphalt mixture according to the embodiment of the present application.

[0037] Figure 4 It is a sectional view of the rolling cylinder assembly of the test device for evaluating asphalt content of asphalt mixture according to the embodiment of the present application.

[0038] Figure 5 It is a structural schematic view of the scraping frame in the rolling cylinder assembly of the test device for evaluating asphalt content of asphalt mixture according to the embodiment of the present application.

[0039] 1 - drying box; 2 - heater; 3 - heating cylinder; 4 - support plate; 5 - driving motor; 6 - rotating shaft; 7 - controller; 8 - inner cylinder; 9 - scraping frame; 10 - rolling cylinder cover; 11 - shaft sleeve; 12 - threaded handle; 13 - fixed plate; 14 - stud; 15 - double lug nut; 16 - adjustable base; 17 - level; 18 - temperature sensor; 19 - scraping piece; 20 - support rod; 21 - fixed ring; 22 - shaft coupling; 23 - support shaft; 24 - support sleeve; 25 - fixed column. DETAILED DESCRIPTION

[0040] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0041] like Figures 1-5 As shown in the figure, an experimental device for evaluating the asphalt content of asphalt mixtures according to an embodiment of the present invention includes a drying chamber 1, a heater 2, a heating cylinder 3, a support plate 4, a drive motor 5, a rotating shaft 6, a controller 7, and a roller assembly. The drive motor 5, the support plate 4, and the heating cylinder 3 are located inside the drying chamber 1. The controller 7 is located on the drying chamber 1. The output end of the drive motor 5 is connected to the rotating shaft 6. The heater 2 is located on the support plate 4. The heater 2 is located on the outside of the heating cylinder 3. The roller assembly is located inside the heating cylinder 3. The roller assembly includes an inner cylinder 8, a scraper 9, and a roller cover 10. The scraper 9 is located inside the inner cylinder 8. The roller cover 10 is detachably connected to the inner cylinder 8 and the scraper 9. A bushing 11 is located at the bottom of the inner cylinder 8. The bushing 11 cooperates with the rotating shaft 6. A chamber cover is located on the drying chamber 1. A support sleeve 24 is located inside the chamber cover. A support shaft 23 is located on the roller cover 10. When the chamber cover is closed, the support shaft 23 cooperates with the support sleeve 24.

[0042] The output end of the drive motor 5 is connected to the rotating shaft 6. The bottom of the heating cylinder 3 has a through hole, through which the rotating shaft 6 passes. The bottom of the inner cylinder 8 has a bushing 11. When the inner cylinder 8 is placed inside the heating cylinder 3, the bushing 11 passes through the through hole at the bottom of the heating cylinder 3 and engages with the rotating shaft 6. The bushing 11 can be fitted onto the rotating shaft 6. Specifically, the rotating shaft 6 has a hexagonal cross-section, and the bushing 11 is a hexagonal bushing that engages with the rotating shaft 6. The rotation of the drive motor 5 drives the rotating shaft 6 to rotate, which in turn drives the bushing 11 to rotate, further rotating the roller assembly. The output end of the drive motor 5 is on the same horizontal line as the rotating shaft 6. This structural design makes the transmission more stable. The support plate 4 provides support for the rotating shaft 6 and the heater 2. The heater 2 is located around the outer heating cylinder, heating it. The heat transfer through the outer heating cylinder is more uniform, and the rotating roller assembly inside the heating cylinder 3 ensures more uniform heating of the asphalt mixture, thus improving the stability of the experiment. Optionally, the heater 2 can be a heating coil, which is wrapped around the heating cylinder 3, and the heating cylinder 3 is fixed on the drying chamber 1. The controller 7 is connected to the drive motor 5, the heater 2, and the temperature sensor 18. The controller 7 is used to control the rotation of the drive motor 5, collect the temperature signal from the temperature sensor 18, and control the heating of the heater 2. The drive motor 5 is connected to the rotating shaft 6 via a coupling 22.

[0043] The material scraping frame 9 is arranged inside the inner cylinder 8 for stirring the asphalt mixture, and the material rolling cylinder cover 10 covers the inner cylinder 8, and when the inner cylinder 8 is filled with the asphalt mixture, the material rolling cylinder cover 10 is detachably connected with the inner cylinder 8 and the material scraping frame 9, and when the inner cylinder 8, the material scraping frame 9 and the material rolling cylinder cover 10 are assembled together, the material rolling cylinder cover 10, the inner cylinder 8 and the material scraping frame 9 are fixed, at this time, the driving motor 5 drives the material rolling cylinder assembly to rotate, the inner cylinder 8 rotates to drive the material scraping frame 9 to rotate to fully stir the asphalt mixture, when the test is completed, the material scraping frame 9 and the material rolling cylinder cover 10 can be disassembled for cleaning, which is time-saving and labor-saving, more convenient, and at the same time, when the data of the asphalt mixture adhered to the material rolling cylinder assembly needs to be collected, the cleaning and collection are more convenient, and the test accuracy is improved. The support shaft 23 is arranged at the center position of the material rolling cylinder cover 10, the shaft sleeve 11 is arranged at the center position of the bottom of the inner cylinder 8, the center axis of the support shaft 23 coincides with the center axis of the shaft sleeve 11 and the center axis of the rotating shaft 6, when the box cover is closed, one end of the support shaft 23 is matched with the support sleeve 24 on the box cover, the support sleeve 24 is used for supporting the support shaft 23, and the one end of the support shaft 23 can rotate on the shaft sleeve 11, and the support sleeve 24 and the rotating shaft 6 form two support points for supporting the material rolling cylinder assembly. In this way, during the rotation of the material rolling cylinder assembly, the rotation is stable, and the asphalt mixture can be more fully stirred for test.

[0044] The heating cylinder 3 is arranged in the heater 2, the heater 2 heats the material rolling cylinder assembly through the heating cylinder 3, the heating is more uniform and stable, the driving motor 5 drives the material rolling cylinder assembly to rotate, the bottom of the material rolling cylinder assembly is connected with the driving motor 5, and the top of the material rolling cylinder assembly is connected with the support shaft 23, so that stable support is formed, the uniformity of stirring is improved, and the collected test data is more accurate.

[0045] Further, the rolling barrel assembly further comprises a threaded handle 12 and a fixed plate 13, the threaded handle 12 is fixedly connected with the support shaft 23 and horizontally rotates relative to the support shaft 23, the outer side of the threaded handle 12 is provided with an external thread, and the fixed plate 13 is provided with a threaded hole, the external thread is matched with the threaded hole, and the two ends of the fixed plate 13 are respectively provided with a fixed hole, and the inner barrel 8 is provided with a fixed column 25 matched with the fixed hole. The threaded handle 12 is sleeved on the support shaft 23 and can horizontally rotate on the support shaft 23, the outer side of the threaded handle 12 is provided with an external thread, the external thread is matched and connected with the threaded hole, the fixed plate 13 can rotate relative to the threaded handle 12 through the threaded hole, when rotating, the fixed plate 13 can rotate and move up and down relative to the threaded handle 12 through the cooperation of the threaded hole and the external thread, when the threaded handle 12 rotates, it is horizontally rotated relative to the support shaft 23, at this time, the threaded handle 12 cannot move up and down relative to the support shaft 23, the threaded handle 12 drives the fixed plate 13 to move up and down through the cooperation of the external thread and the internal thread, the fixed plate 13 is rectangular, the fixed holes are distributed at the two ends of the fixed plate 13, and there is one fixed hole at each end, each fixed hole is a long hole, and a large hole and a small hole are respectively arranged at the two ends of the long hole, the fixed column 25 is similar to the shape of a screw, and a circular fixed head is arranged at the top end of the fixed column 25, when in use, the large hole is sleeved on the fixed column 25, the diameter of the large hole is larger than that of the circular fixed head, the fixed head on the fixed column 25 penetrates through the large hole of the fixed plate 13, the fixed plate 13 is rotated, the fixed column 25 moves to the small hole along the long hole, at this time, the diameter of the small hole is smaller than that of the fixed head, at this time, the threaded handle 12 is rotated, the threaded handle 12 drives the fixed plate 13 to move up, the fixed plate 13 moves up, the small hole on the fixed plate 13 is clamped with the fixed head, the support shaft 23 is connected with the rolling barrel cover 10, the threaded handle 12 can horizontally rotate relative to the support shaft 23 and cannot move up and down, and the threaded handle 12 is clamped with the internal thread on the fixed plate 13 through the external thread.

[0046] Specifically, the scraping frame 9 is provided with a stud 14, the rolling barrel cover 10 is provided with a stud 14 hole, the stud 14 penetrates through the stud 14 hole and fixes the rolling barrel cover 10 and the scraping frame 9 together through the double-ear nut 15. The double-ear nut 15 is matched with the stud 14, the stud 14 penetrates through the stud 14 hole, is screwed on the stud 14 through the double-ear nut 15, and fixes the rolling barrel cover 10 and the scraping frame 9 together, the stud 14 is matched with the stud 14 hole to prevent the scraping frame 9 from rotating relative to the rolling barrel cover 10, and the double-ear nut 15 prevents the scraping frame 9 from being separated from the rolling barrel cover 10. The rolling barrel cover 10 and the scraping frame 9 are fixed, the rolling barrel cover 10 is fixed with the inner barrel 8, through the arrangement of the above structure, it can be guaranteed that the rolling barrel assembly can fix the scraping frame 9 and the inner barrel 8 when rotating, prevent the inner barrel 8 and the scraping frame 9 from rotating relative to each other, reduce the stirring effect, and fully fix the asphalt mixture for the stirring test.

[0047] Optionally, the bottom of the drying box 1 is provided with an adjustable base 16, and the top of the drying box 1 is provided with a level 17. Whether the drying box 1 is horizontal is judged by the level 17, and if it is not placed horizontally, it can be adjusted to be horizontal by adjusting the base.

[0048] Further, temperature sensors 18 are arranged on the bottom of the heating cylinder 3 and the inner side wall of the box cover, respectively. The temperature sensors 18 collect temperature and transmit the temperature to the controller 7, and the controller 7 displays the temperature on the control panel, facilitating the test personnel to record and observe the control of the internal temperature.

[0049] Specifically, the material scraping frame 9 includes a scraping blade 19, a supporting rod 20 and a fixing ring 21, and the supporting rod 20 and the scraping blade 19 are arranged at intervals in the circumferential direction of the fixing ring 21. Two fixing rings are arranged at the two ends of the scraping blade 19 and the supporting rod 20, respectively, and the material scraping frame 9 can be taken out for cleaning or taking out the asphalt mixture on the scraping blade 19, which is more convenient.

[0050] The test device for evaluating the asphalt content of asphalt mixture has simple structure, can perform asphalt content test on the asphalt mixture, collects data of the asphalt mixture more safely and conveniently, is convenient to clean and use, greatly improves the work efficiency of test personnel, and reduces test cost.

[0051] The application further provides a method for evaluating the asphalt content of asphalt mixture.

[0052] Step S1: paste the filter paper on the inner cylinder wall, fix the material scraping frame on the inner cylinder, and then cover the rolling material cylinder cover on the inner cylinder, and weigh the mass M0 of the rolling material cylinder assembly. First, place the filter paper tightly against the inner cylinder wall, then place the material scraping frame in the inner cylinder, the filter paper should fully wrap the scraping blade frame including the supporting rod and the fixing ring, and weigh the mass M0 of the rolling material cylinder, accurate to 0.1g.

[0053] Step S2: weigh the mass m0 of the asphalt mixture before the test, open the rolling cylinder cover, pour the asphalt mixture into the inner cylinder, and then weigh the total mass M1 of the rolling cylinder assembly loaded with the asphalt mixture; the asphalt mixture is weighed by the decrement method to obtain the required test mass m0 (about 2 kg, 2.5 kg, 3 kg, and 3.5 kg, respectively), with an accuracy of 0.01 g; then pour it into the assembled rolling cylinder assembly in time, weigh the mass M1 of the rolling cylinder assembly and the asphalt mixture, with an accuracy of 0.1 g; then place the rolling cylinder assembly loaded with the material into the device and heat it at the test temperature for 1.5 h. Preheat the device to the required test temperature (150°C, 160°C, and 170°C, respectively); set the working time and speed (the working time is 10 min, 15 min, 20 min, 25 min, and 30 min, respectively; the driving motor speed is 10 r / min, 15 r / min, 20 r / min, 25 r / min, and 30 r / min, respectively), and start the test.

[0054] Step S3: place the rolling cylinder assembly loaded with the asphalt mixture into the heating cylinder, close the box cover, preheat the heating cylinder to the test temperature, set the speed of the driving motor and the test time, and start the device.

[0055] Step S4: after the test is completed, turn off the device, take out the rolling cylinder assembly, weigh the mass m1 of the asphalt mixture poured out of the rolling cylinder assembly and the mass M2 of the rolling cylinder assembly after the asphalt mixture is poured out; after the test is completed, turn off the device, take out the rolling cylinder and pour out the material in the rolling cylinder, weigh the mass m1 of the poured-out asphalt mixture with an accuracy of 0.01 g, and weigh the mass M2 of the rolling cylinder assembly after the asphalt mixture is poured out with an accuracy of 0.1 g.

[0056] Step S5: calculate the adhesion loss of the asphalt mixture:

[0057] Δm = (m0 - m1) / m0 x 100 = (M2 - M0) / (M1 - M0) x 100

[0058] Wherein, m0: the mass of the asphalt mixture before the test, in g;

[0059] m1: the mass of the asphalt mixture poured out after the test, in g;

[0060] M0: the mass of the rolling cylinder assembly before the test, in g;

[0061] M1: the total mass of the rolling cylinder assembly and the asphalt mixture before the test, in g;

[0062] M2: the mass of the rolling cylinder assembly after the test (the rolling cylinder + the asphalt binder, fine aggregate, etc. adhered to the rolling cylinder), in g;

[0063] Delta m: adhesion loss of the asphalt mixture, in %. The asphalt content is determined according to the adhesion loss of the asphalt mixture. The method for evaluating the asphalt content of the asphalt mixture test device of the present application has a convenient and fast process, the data obtained by the method is stable and reliable, and the asphalt content can be fully evaluated for analysis and improvement by the staff, greatly improving the test and evaluation efficiency of the asphalt content, having low requirements for test conditions, small error factors, and being more practical.

[0064] In the description of the present specification, the description referring to the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0065] It is not difficult for those skilled in the art to understand that the present application includes any combination of the above description of the summary of the application and the specific embodiment part and the parts shown in the drawings, limited by the length and in order to make the specification brief, each scheme formed by these combinations is not described one by one. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

[0066] Although the embodiments of the present application have been shown and described above, it is understood that the above-described embodiments are exemplary and should not be construed as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above-described embodiments without departing from the principles and purposes of the present application within the scope of the present application. The scope of the present application is defined by the appended claims and their equivalents.

Claims

1. An apparatus for evaluating asphalt content of an asphalt mixture, characterized by, The application relates to a drying box, a heater, a heating cylinder, a supporting plate, a driving motor, a rotating shaft, a controller and a rolling cylinder assembly; the driving motor, the supporting plate and the heating cylinder are arranged in the drying box, the output end of the driving motor is connected with the rotating shaft through a shaft coupling, the heater is arranged on the supporting plate, the outer side of the heating cylinder is provided with the heater, and the rolling cylinder assembly is arranged in the heating cylinder; a box cover is arranged on the drying box, a supporting sleeve is arranged on the inner side of the box cover, and temperature sensors are arranged on the bottom of the heating cylinder and the inner side wall of the box cover. The rolling cylinder assembly comprises an inner cylinder, a material scraping frame, a rolling cylinder cover, a threaded handle and a fixing plate; the material scraping frame is arranged in the inner cylinder, the rolling cylinder cover is detachably connected with the inner cylinder and the material scraping frame, an axle sleeve is arranged at the bottom of the inner cylinder and matched with the rotating shaft, a supporting shaft is arranged on the rolling cylinder cover, and the supporting shaft is matched with the supporting sleeve when the box cover is closed. The threaded handle is fixedly connected with the supporting shaft and horizontally rotates relative to the supporting shaft, an external rotating thread is arranged on the outer side of the threaded handle, a threaded hole is arranged on the fixing plate, the external rotating thread is matched with the threaded hole, and fixing holes are arranged at the two ends of the fixing plate; fixing columns matched with the fixing holes are arranged on the inner cylinder. Screws are arranged on the material scraping frame, screw holes are arranged on the rolling cylinder cover, the screws pass through the screw holes and fix the rolling cylinder cover and the material scraping frame together through double-ear nuts. The material scraping frame comprises scraping pieces, supporting rods and a fixing ring, and the supporting rods and the scraping pieces are arranged at intervals in the circumferential direction of the fixing ring.

2. The test device for evaluating asphalt content of an asphalt mixture according to claim 1, wherein An adjustable base is arranged at the bottom of the drying box, and a level is arranged at the top of the drying box.

3. A test method for evaluating asphalt content of an asphalt mixture, characterized by, The test device for evaluating the asphalt content of asphalt mixture is used, and the test method comprises the following steps: S1: paste filter paper on the inner cylinder wall, fix the material scraping frame on the inner cylinder, and cover the rolling cylinder cover on the inner cylinder; weigh the mass M0 of the rolling cylinder assembly; S2: weigh the mass m0 of the asphalt mixture before the test, open the rolling cylinder cover, pour the asphalt mixture into the inner cylinder, and weigh the total mass M1 of the rolling cylinder assembly with the asphalt mixture; S3: place the rolling cylinder assembly with the asphalt mixture into the heating cylinder, close the box cover, preheat the heating cylinder to the test temperature, set the rotating speed of the driving motor and the test time, and start the test device; S4: after the test is completed, close the test device, take out the rolling cylinder assembly, weigh the mass m1 of the asphalt mixture poured out of the rolling cylinder assembly and the mass M2 of the rolling cylinder assembly after the asphalt mixture is poured out; S5: calculate the adhesion loss of the asphalt mixture: Δm = (m0-m1) / m0 x 100 = (M2-M0) / (M1-M0) x 100, wherein, m0: the mass of the asphalt mixture before the test, unit: g; m1: the mass of the asphalt mixture poured out after the test, unit: g; M0: the mass of the rolling cylinder assembly before the test, unit: g; M1: the total mass of the rolling cylinder assembly and the asphalt mixture before the test, unit: g; ​ M2: mass of the rolling barrel assembly after the test, in g; Δm: adhesion loss of the asphalt mixture, in %; The asphalt content is determined according to the adhesion loss of the asphalt mixture.

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