Device and method for detecting asphalt content fluctuation in asphalt mixture

Abstract

The present invention provides a device and method for detecting asphalt content fluctuation in an asphalt mixture. The device for detecting asphalt content fluctuation in an asphalt mixture comprises a device body and a measuring assembly assembled on a vibration table of the device body, the measuring assembly comprises a forming cylinder and a height measuring device combined and assembled with the forming cylinder, and the height measuring device is disposed on a side away from the vibration table; the forming cylinder comprises a filling cylinder and a test mold cylinder which are detachably arranged and communicated with each other, and the test mold cylinder is disposed on a side close to the vibration table; the height measuring device comprises a measuring plate, the measuring plate is suspended in the forming cylinder and moves up and down in the height direction of the cylinder, and the height measuring device is used for monitoring height variations of the asphalt mixture in the cylinder so as to determine whether the asphalt content fluctuation in the asphalt mixture meets requirements. The detection device provided by the present invention can be used for detecting asphalt content fluctuation in an asphalt mixture, has high detection accuracy, is easy to operate, and is non-toxic and harmless.

Description

Asphalt Mixture Asphalt Fluctuation Detection Device and Method Technical Field

[0001] This invention relates to the field of road engineering technology, specifically to an asphalt mixture fluctuation detection device and method. Background Technology

[0002] Excessive fluctuations in the gradation and asphalt content of asphalt mixtures can adversely affect the structural performance of asphalt concrete; therefore, it is necessary to control these fluctuations within a certain range.

[0003] Existing extraction methods are commonly used to test for fluctuations. These methods use trichloroethylene, but this solvent is volatile, toxic, and pollutes the environment.

[0004] Therefore, it is essential to develop a detection method that does not rely on trichloroethylene solvent to detect the volatility of asphalt mixtures. Summary of the Invention

[0005] The main objective of this invention is to provide an asphalt mixture fluctuation detection device and method. The detection device provided by this invention can be used to detect the asphalt fluctuation of asphalt mixtures. It has high detection accuracy, is easy to operate, and is non-toxic and harmless.

[0006] To achieve the above objectives, the present invention provides the following technical solutions.

[0007] A first aspect of the present invention provides an asphalt mixture asphalt fluctuation detection device. The detection device includes a device body and a measuring component mounted on a vibration table of the device body. The measuring component includes a forming cylinder and a height measuring device assembled with the forming cylinder, the height measuring device being positioned on a side away from the vibration table. The forming cylinder includes a detachable and connected filler cylinder and a test mold cylinder, the test mold cylinder being positioned on a side close to the vibration table. The height measuring device includes a detection plate, the detection plate being suspended inside the forming cylinder and moving up and down along the cylinder height direction. The height measuring device is used to monitor the height change of the asphalt mixture inside the cylinder to determine whether its asphalt content fluctuation meets the requirements.

[0008] In some embodiments of the present invention, the packing cylinder and the test mold cylinder are each independently cylindrical with open ends, and the inner diameter of the packing cylinder is the same as the inner diameter of the test mold cylinder.

[0009] In some embodiments of the present invention, the height measuring device further includes a magnetostrictive sensor and a magnetic ring that moves synchronously with the detection plate. The magnetostrictive sensor is used to monitor the position height and / or moving distance of the detection plate in real time.

[0010] In some embodiments of the present invention, the height measuring device further includes a guide shaft and a support column. One end of the guide shaft is connected to the detection plate, and the end of the guide shaft away from the detection plate is used to connect the magnetic ring. The magnetostrictive sensor is disposed at one end of the support column, and the magnetic ring is sleeved on the support column and reciprocates along the length direction of the support column.

[0011] In some embodiments of the present invention, the height measuring device further includes a magnetic ring connecting plate, one end of which is connected to the magnetic ring, and the end of the magnetic ring connecting plate away from the magnetic ring is connected to the end of the guide shaft away from the detection plate.

[0012] In some embodiments of the present invention, the height measuring device further includes a linear bearing assembly connected and cooperating with the guide shaft.

[0013] In some embodiments of the present invention, the measuring assembly further includes a cap that mates with the forming cylinder, the cap being positioned on a side away from the vibration table; the detection plate extends into the interior of the forming cylinder through the cap.

[0014] In some embodiments of the present invention, the device body further includes a support frame for supporting the measuring component.

[0015] In a second aspect, the present invention provides a method for detecting asphalt fluctuation in asphalt mixtures, the method being based on the asphalt fluctuation detection device for asphalt mixtures described in the first aspect; the method comprising: assembling a measuring component on a vibration table; filling a molding cylinder with a prepared asphalt mixture, starting the vibration table to compact the asphalt mixture, with the detection plate abutting against the upper surface of the asphalt mixture, and obtaining the height H1 of the asphalt mixture at this time; disassembling the mold cylinder, starting the vibration table again, setting a vibration frequency and vibration time T, causing the asphalt mixture to flow under vibration, and the detection plate moving downwards with the asphalt mixture, obtaining the height H2 of the asphalt mixture at this time, and calculating the flowability V of the asphalt mixture; wherein, V = (H1 - H2) / T; and determining whether the asphalt content fluctuation meets the requirements based on the flowability V of the asphalt mixture.

[0016] In some embodiments of the present invention, the asphalt mixture includes BBME0-14 asphalt mixture, and when the flowability of the asphalt mixture is below 1.55 cm / s, the asphalt content fluctuation meets the quality requirements.

[0017] Compared with the prior art, the present invention achieves the following technical effects:

[0018] This invention provides a testing device that can be used to detect the asphalt volatility of asphalt mixtures. It has high accuracy, is easy to operate, and is non-toxic and harmless.

[0019] In the detection method of this invention, when the flowability of the asphalt mixture is below 1.55 cm / s, it can be determined that the asphalt content fluctuation of the asphalt mixture meets the requirements.

[0020] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention are described below. Attached Figure Description

[0021] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0022] Figure 1 is a schematic diagram of the asphalt fluctuation detection device for asphalt mixtures according to one or more embodiments.

[0023] Figure 2 is a schematic diagram of the structure of a measurement component according to one or more embodiments.

[0024] Figure 3 is a cross-sectional view of a measuring assembly according to one or more embodiments.

[0025] Figure 4 shows the relationship between the asphalt-aggregate ratio and the fluidity of BBME0-14 asphalt mixture.

[0026] Reference numerals: 1000, Asphalt fluctuation detection device; 100, Device body; 10, Vibration table; 11, Support frame; 200, Measuring component; 20, Molding cylinder; 21, Filler cylinder; 22, Test mold cylinder; 30, Height measuring device; 31, Detection plate; 32, Magnetostrictive sensor; 33, Magnetic ring; 34, Guide shaft; 35, Support column; 36, Magnetic ring connecting plate; 37, Linear bearing assembly; 371, Linear bearing seat; 372, Linear bearing; 38, Magnetostrictive sensor base; 40, Cylinder cover. Detailed Implementation

[0027] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. However, it should be understood that these descriptions are merely exemplary and not intended to limit the scope of the invention. Furthermore, descriptions of well-known structures and techniques are omitted in the following description to avoid unnecessarily obscuring the concept of the invention.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the invention, are intended to cover non-exclusive inclusion.

[0029] In the description of the embodiments of this invention, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this invention, "multiple" means two or more, unless otherwise explicitly defined.

[0030] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0031] In the description of the embodiments of this invention, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0032] In the description of the embodiments of the present invention, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0033] In the description of the embodiments of the present invention, unless otherwise explicitly specified and limited, the technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of the present invention according to the specific circumstances.

[0034] This invention primarily utilizes the main characteristics of hot-mix asphalt mixtures to design testing methods. Firstly, it examines the flow variability of hot-mix asphalt mixtures under vibration conditions. Theoretically, an asphalt mixture with a given mix proportion should exhibit a unique flow velocity under the same conditions when subjected to external vibration. Secondly, it examines the density fluctuation of hot-mix asphalt mixtures. An asphalt mixture with a given mix proportion should have a corresponding range of hot-mix asphalt mixture density values.

[0035] In embodiments of the present invention, the presence of viscous forces within the graded hot-mix asphalt mixture is determined within a compaction temperature range (e.g., 155±5℃) after mixing. These viscous forces are related to the asphalt content in the mixture and the ability of the aggregates in the mixture to absorb asphalt. Insufficient or excessive asphalt content will lead to a decrease in the adhesion between aggregates within the asphalt mixture. By applying a certain vibration force to the asphalt mixture within a compaction temperature range under certain external constraints, it can be bonded into a unified shape. This unified shape changes with variations in the asphalt content, resulting in different unit weights. This property is used to determine whether the asphalt content in the asphalt mixture is appropriate or to assess the fluctuations in the quality of the hot-mix asphalt mixture.

[0036] It is worth mentioning that the detection method in this invention is based on the detection device designed in this invention.

[0037] This invention provides an asphalt mixture asphalt fluctuation detection device 1000 as shown in Figure 1, and is described in conjunction with Figures 2 and 3. It includes a device body 100 and a measuring component 200 mounted on a vibration table 10 of the device body 100. The measuring component 200 includes a forming cylinder 20 and a height measuring device 30 assembled with the forming cylinder 20, the height measuring device 30 being positioned away from the vibration table 10. The forming cylinder 20 includes a detachable and connected filling cylinder 21 and a test mold cylinder 22, the test mold cylinder 22 being positioned closer to the vibration table 10. The height measuring device 30 includes a detection plate 31, which is suspended inside the forming cylinder 20 and moves up and down along the cylinder height direction. The height measuring device 30 is used to monitor the height change of the asphalt mixture inside the cylinder to determine whether its asphalt content fluctuation meets the requirements.

[0038] In embodiments of the present invention, during use, asphalt mixture can be filled into the inner cavity of the molding cylinder 20. The molding cylinder 20 can be preheated before filling with the asphalt mixture, and the asphalt mixture can also be pre-prepared and kept warm in an oven at a specified temperature for later use. During the inspection process, instruments such as a non-contact infrared thermometer can be used to measure the temperature of the sample to facilitate data comparison later.

[0039] Referring to Figure 1, the device body 100, or the main unit of the device, has a vibration table 10 with a vibration surface of not less than 60cm*60cm, an adjustable vibration frequency of 0 to 100Hz, an amplitude of 0 to 5mm, and an adjustable vibration time of 0 to 40s.

[0040] In an embodiment of the present invention, when the molding cylinder 20 is placed on the vibration table 10, the bottom end of the molding cylinder 20 abuts against the table surface of the vibration table 10, and the table surface of the vibration table 10 is formed as the bottom surface of the molding cylinder 20.

[0041] Referring again to Figure 1, the device body 100 also includes a support frame 11, which can be mounted on the vibration table 10 to support and install the measuring component 200.

[0042] In an embodiment of the present invention, the support frame 11 can also be configured as a telescopic structure. When the vibration table 10 vibrates, the support frame 11 supports the filler cylinder 21 away from the vibration table 10, which facilitates the flow of asphalt mixture under vibration.

[0043] In embodiments of the present invention, the device body 100 further includes a calculation system, a weighing system, and a display system.

[0044] Referring to Figures 2 and 3, the packing cylinder 21 and the test mold cylinder 22 in the molding cylinder 20 are each independently cylindrical with open ends, and the inner diameter of the packing cylinder 21 is the same as the inner diameter of the test mold cylinder 22.

[0045] In embodiments of the present invention, the dimensions of the packing cylinder 21 can be set according to actual needs. For example, a stainless steel cylindrical cylinder with a diameter of 16cm and a height of 32cm can be used, or a stainless steel cylindrical cylinder with a diameter of 20cm and a height of 40cm can be used, or a stainless steel cylindrical cylinder with a diameter of 11.2cm and a height of 22.4cm can be used, or a stainless steel cylindrical cylinder with a diameter of 8cm and a height of 16cm can be used, etc., without specific limitations. Correspondingly, a detachable test mold cylinder 22 of the same diameter is connected below the packing cylinder 21. The height of the test mold cylinder 22 can be 8cm, or 10cm, or 5.6cm, or 4cm, etc., without specific limitations.

[0046] In an embodiment of the present invention, when filling the inner cavity of the molding cylinder 20 with asphalt mixture, a circular trapezoidal funnel can be used. The funnel can be made of stainless steel, and the size of the funnel can be selected according to the actual situation, such as the inner diameter of the funnel being equivalent to the inner diameter of the filling cylinder 21.

[0047] Referring again to Figures 2 and 3, the measuring assembly 200 also includes a cover 40 that mates with the forming cylinder 20, the cover 40 being positioned on the side away from the vibration table 10; the detection plate 31 extends into the interior of the forming cylinder 20 through the cover 40.

[0048] Referring to Figure 3, the height measuring device 30 is mounted on the cylinder cover 40. The cylinder cover 40 can also be understood as a mounting base for the height measuring device 30. The height measuring device 30 includes a detection plate 31, which extends into the molding cylinder 20. During operation, the detection plate 31 abuts against the upper surface (top surface) of the asphalt mixture, thereby measuring the height of the asphalt mixture inside the cylinder cavity. At this time, its function is equivalent to that of a measuring head. At the same time, it plays a role in compaction during the molding process of the asphalt mixture.

[0049] In an embodiment of the present invention, the detection plate 31 is disc-shaped and is used in conjunction with the packing cylinder 21. Therefore, the size of the detection plate 31 needs to be set with reference to the inner diameter of the packing cylinder 21. For example, the outer diameter can be 20cm, 16cm, 11.2cm, or 8cm. The specific size can be selected according to the actual situation.

[0050] Referring again to Figure 3, the height measuring device 30 also includes a magnetostrictive sensor 32 and a magnetic ring 33 that moves synchronously with the detection plate 31. The magnetostrictive sensor 32 is used to monitor the position height and moving distance of the detection plate 31 in real time and output a signal to the device body to calculate the flowability V of the asphalt mixture.

[0051] In an embodiment of the present invention, the height measuring device 30 further includes a magnetostrictive sensor base 38 for mounting a magnetostrictive sensor 32. The magnetostrictive sensor 32 is used to test the height change of the asphalt mixture under flow conditions to calculate the fluidity and determine whether the asphalt content fluctuation meets the requirements.

[0052] Referring again to Figure 3, the height measuring device 30 also includes a guide shaft 34 and a support column 35. The guide shaft 34 and the support column 35 are independently and parallel to each other. One end of the guide shaft 34 is connected to the detection plate 31 and extends into the inner cavity of the forming cylinder 20 through the cylinder cover 40. The guide shaft 34 is slidably connected to the cylinder cover 40, that is, the guide shaft 34 moves up and down relative to the cylinder cover 40. The end of the guide shaft 34 away from the detection plate 31 is used to connect the magnetic ring 33, thereby ensuring that the magnetic ring 33 moves synchronously with the detection plate 31. The magnetostrictive sensor 32 is set at one end of the support column 35, and the magnetic ring 33 is sleeved on the support column 35 and reciprocates along the length of the support column 35.

[0053] In an embodiment of the present invention, the guide shaft 34 and the support column 35 are each independently and vertically arranged, as shown in FIG3. The guide shaft 34 and the support column 35 are respectively vertically arranged on the cylinder cover 40. At this time, the end of the guide shaft 34 away from the detection plate 31 is connected to the magnetic ring 33 through the magnetic ring connecting plate 36, thereby realizing the synchronous movement of the magnetic ring 33 and the detection plate 31. Specifically, one end of the magnetic ring connecting plate 36 is connected to the magnetic ring 33, and the end of the magnetic ring connecting plate 36 away from the magnetic ring 33 is connected to the end of the guide shaft 34 away from the detection plate 31.

[0054] Referring again to Figure 3, the height measuring device 30 also includes a linear bearing assembly 37 that is connected and cooperates with the guide shaft 34.

[0055] In an embodiment of the present invention, the linear bearing assembly 37 includes a linear bearing housing 371 and a linear bearing 372 mounted on the linear bearing housing 371, the linear bearing 372 being used in conjunction with a guide shaft 34.

[0056] The present invention also provides a method for detecting asphalt fluctuation in asphalt mixtures. The key is to measure the flowability of asphalt mixtures based on the asphalt fluctuation detection device of the present invention, and then determine whether the asphalt content fluctuation meets the requirements.

[0057] The asphalt fluctuation detection method for asphalt mixtures in this invention is carried out according to the following steps.

[0058] (1) Preparation of asphalt mixture samples.

[0059] In an embodiment of the present invention, asphalt mixture samples with fixed gradation are prepared, and the prepared samples are placed in an oven at a specified temperature for heat preservation and later use.

[0060] In an embodiment of the present invention, the forming cylinder and the funnel are placed in an oven at the same temperature for heat preservation and standby.

[0061] In embodiments of the present invention, the asphalt mixture may be, but is not limited to, BBME0-14 asphalt mixture.

[0062] (2) Assemble the forming cylinder on the vibration table.

[0063] In an embodiment of the present invention, the molding cylinder is placed on a vibration table, and the surface of the vibration table is formed as the bottom surface of the test mold cylinder to prevent the asphalt mixture from leaving the inner cavity of the cylinder, and to compact and form it in the inner cavity of the cylinder under subsequent vibration.

[0064] (3) Fill the molding cylinder with the prepared asphalt mixture sample.

[0065] In an embodiment of the present invention, the prepared asphalt mixture sample is added to the molding cylinder using a funnel, and is 5cm to 8cm above the upper edge of the filling cylinder, for example, one of 5cm, 6cm, 7cm, or 8cm above the upper edge of the filling cylinder, or any value that meets the above range.

[0066] (4) Start the vibration table to compact the asphalt mixture sample and obtain the height H1 of the asphalt mixture sample at this time through the height measuring device.

[0067] In an embodiment of the present invention, the vibration table is started and vibrated at a frequency of 60Hz for 3 to 5 seconds to compact the sample.

[0068] In some embodiments of the present invention, after the compaction is completed, the funnel is removed, and the cylinder cover, together with the height measuring device, is assembled with the forming cylinder. At this time, the detection plate abuts against the upper surface of the asphalt mixture sample. The detection plate also serves to keep the sample surface flat and measures the height H1 of the sample at this time.

[0069] In some embodiments of the present invention, after vibration compaction and molding, when the funnel is removed and the height of the molded sample is higher than the upper edge of the packing cylinder, the excess sample above the upper opening of the packing cylinder can be scraped off with a steel ruler first, and then the height H1 of the sample can be measured by a detection plate.

[0070] (5) Disassemble the test mold cylinder, restart the vibration table, and under the preset vibration frequency and vibration time T, make the asphalt mixture sample flow under the vibration action. At the same time, the test plate moves down synchronously with the sample to obtain the height H2 of the asphalt mixture sample at this time, and calculate the flowability V of the asphalt mixture; where V=(H1-H2) / T.

[0071] In some embodiments of the present invention, the test mold cylinder is removed, the vibration table is started, and it is vibrated at a frequency of 60Hz for a time T of 5s to obtain the height H2 of the asphalt mixture sample at this time.

[0072] (6) Determine whether the asphalt content fluctuation meets the requirements based on the asphalt mixture fluidity V.

[0073] In an embodiment of the present invention, a flowability-asphalt ratio curve of asphalt mixture is plotted based on the flowability and asphalt-aggregate ratio of asphalt mixture, as shown in Figure 4. The curve shows that when the flowability of asphalt mixture is below 1.55 cm / s, the asphalt content fluctuation meets the quality requirements.

[0074] It is worth mentioning that, in order to ensure the accuracy of the test data, 3 to 5 parallel tests were conducted under the condition of ensuring a certain temperature range for the sample.

[0075] Unless otherwise defined, the technical terms used in the following embodiments have the same meaning as commonly understood by those skilled in the art. Unless otherwise specified, the experimental reagents used in the following embodiments are all conventional biochemical reagents; the raw materials, instruments, and equipment used in the following embodiments can all be obtained commercially or through existing methods; unless otherwise specified, the amounts of experimental reagents used are the amounts used in conventional experimental operations; unless otherwise specified, the experimental methods are all conventional methods.

[0076] Example 1

[0077] A device for detecting asphalt fluctuation in asphalt mixtures, as shown in Figure 1, is provided. The device is used to detect asphalt fluctuation in asphalt mixtures, and the effectiveness of the detection method in this invention is verified.

[0078] Asphalt mixtures were prepared using a defined BBME0-14 mix proportion and subjected to vibration flowability tests. The results are shown in Figure 4. The average flowability of the three tests at the optimal asphalt content of 5% was 0.71 cm / s. The flowability value was 1.55 cm / s when the asphalt content fluctuated within a range of ±0.3%. Therefore, when the flowability is below 1.55 cm / s, the asphalt content fluctuation of the asphalt mixture meets the quality requirements.

[0079] The method for detecting asphalt fluctuation in asphalt mixtures includes:

[0080] The prepared asphalt mixture samples were placed in an oven for heat preservation and prepared for later use. The molding cylinder 20 and the funnel were also kept in an oven at the same temperature for heat preservation and prepared for later use.

[0081] The sample is added to the packing cylinder 21 in one go using a funnel, reaching a height of 5 cm above the upper edge of the packing cylinder 21. The vibration table 10 is then started and vibrated at a frequency of 60 Hz for 3 seconds to compact the sample. The funnel is then removed, and the excess sample above the upper opening of the packing cylinder 21 is scraped off with a steel ruler.

[0082] Assemble the height measuring device 30, and the detection plate 31 abuts against the upper surface of the molded sample to measure the height H1 of the sample at this time.

[0083] Remove the test mold cylinder 22, restart the vibration table 10, and vibrate it at a frequency of 60Hz for 5s (T). During the vibration, the test plate 31 moves downward with the sample flow. After the vibration is completed, the height H2 of the sample is measured. The flowability of asphalt mixture V = (H1 - H2) / T.

[0084] Meanwhile, this invention applies the testing method to the quality control of the production and construction of PK20-PK60 asphalt base concrete and asphalt surface concrete for a certain highway project. The total amount of asphalt concrete is about 500,000 tons, and the fluidity is tested more than 500 times. Some test data are summarized in Table 1 below.

[0085] Table 1 Summary of Test Data

[0086] As can be seen from Table 1, the detection method based on the detection device in this invention has high accuracy and is easy to operate. When the flowability of the asphalt mixture is below 1.55 cm / s, it can be determined that the asphalt content fluctuation of the asphalt mixture meets the requirements.

[0087] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered within the scope of the claims and specification of the present invention. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A device for detecting asphalt fluctuation in asphalt mixtures, characterized in that, The device includes a main body and a measuring assembly mounted on a vibration table on the main body. The measuring assembly includes a forming cylinder and a height measuring device assembled with the forming cylinder. The height measuring device is located on the side away from the vibration table. The molding cylinder includes a detachable and connected filler cylinder and a test mold cylinder, with the test mold cylinder positioned on the side close to the vibration table; The height measuring device includes a detection plate, which is suspended inside the forming cylinder and moves up and down along the cylinder height direction. The height measuring device is used to monitor the height change of the asphalt mixture inside the cylinder to determine whether the asphalt content fluctuation meets the requirements.

2. The asphalt mixture fluctuation detection device as described in claim 1, characterized in that, The packing cylinder and the test mold cylinder are each independently cylindrical with open ends, and the inner diameter of the packing cylinder is the same as that of the test mold cylinder.

3. The asphalt mixture fluctuation detection device as described in claim 1, characterized in that, The height measuring device also includes a magnetostrictive sensor and a magnetic ring that moves synchronously with the detection plate. The magnetostrictive sensor is used to monitor the position height and / or moving distance of the detection plate in real time.

4. The asphalt mixture fluctuation detection device as described in claim 3, characterized in that, The height measuring device also includes a guide shaft and a support column. One end of the guide shaft is connected to the detection plate, and the end of the guide shaft away from the detection plate is used to connect to the magnetic ring. The magnetostrictive sensor is disposed at one end of the support column, and the magnetic ring is sleeved on the support column and reciprocates along the length of the support column.

5. The asphalt mixture fluctuation detection device as described in claim 4, characterized in that, The height measuring device also includes a magnetic ring connecting plate, one end of which is connected to the magnetic ring, and the end of the magnetic ring connecting plate away from the magnetic ring is connected to the end of the guide shaft away from the detection plate.

6. The asphalt mixture fluctuation detection device as described in claim 4, characterized in that, The height measuring device also includes a linear bearing assembly that is connected and cooperates with the guide shaft.

7. The asphalt mixture fluctuation detection device as described in claim 1, characterized in that, The measuring assembly also includes a cap that mates with the forming cylinder, the cap being positioned on the side away from the vibration table; the detection plate extends into the interior of the forming cylinder through the cap.

8. The asphalt mixture fluctuation detection device as described in claim 1, characterized in that, The device body also includes a support frame for supporting the measuring components.

9. A method for detecting asphalt fluctuation in asphalt mixtures, characterized in that, The detection method is based on the asphalt mixture asphalt fluctuation detection device according to any one of claims 1 to 8; the detection method includes: Mount the measuring components onto the vibration table; The prepared asphalt mixture is filled into the molding cylinder, and the vibration table is started to compact the asphalt mixture into shape. The detection plate abuts against the upper surface of the asphalt mixture to obtain the height H1 of the asphalt mixture at this time. The test mold cylinder is disassembled, and the vibration table is restarted. The vibration frequency and vibration time T are preset so that the asphalt mixture flows under the vibration. The detection plate moves downward with the asphalt mixture to obtain the height H2 of the asphalt mixture at this time, and the flowability V of the asphalt mixture is calculated. Wherein, V=(H1-H2) / T; The asphalt content fluctuation is determined based on the asphalt mixture flowability V to determine whether it meets the requirements.

10. The method for detecting asphalt fluctuation in asphalt mixtures as described in claim 9, characterized in that, The asphalt mixture includes BBME0-14 asphalt mixture, and when the flowability of the asphalt mixture is below 1.55 cm / s, the asphalt content fluctuation meets the quality requirements.

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