Solid-state asphalt detection method, device and system based on magneto-rheological effect

Abstract

The application discloses a solid asphalt detection method, device and system based on a magneto-rheological effect, and relates to the technical field of material detection. The method comprises the following steps: taking an asphalt sample from in-situ asphalt and heating the asphalt sample to a flowing state; mixing magnetic powder with the asphalt sample in the flowing state and performing solidification treatment to form a magneto-rheological asphalt composite material sample; measuring rheological parameters of the magneto-rheological asphalt composite material sample under different magnetic field intensities; calculating the change rate of the rheological parameters; and evaluating the aging condition of the in-situ asphalt according to the change rate of the rheological parameters and a preset standard curve, wherein the standard curve is used to record the relationship between the change rate of the rheological parameters and the aging degree of the asphalt. By using the application, the asphalt aging problem caused by repeated heating in asphalt testing can be avoided, and the detection of the rheological parameters and the aging condition of the asphalt can be realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of material detection, and in particular to a solid asphalt detection method, device and system based on magneto-rheological effect. BACKGROUND

[0002] In road construction, building waterproofing and other engineering, the performance of asphalt is directly related to the engineering quality and service life. However, the existing asphalt test mainly has the following problems:

[0003] I. Distortion of test results

[0004] In traditional asphalt testing, repeated heating of asphalt samples is common, without fully considering the sensitivity of asphalt to heating, and lacking effective technical means to avoid heating aging. For example, in the asphalt aging test, due to the need of sample preparation and test process, the asphalt has to be heated multiple times; during the heating process, the asphalt will undergo chemical reactions such as oxidation and polymerization, changing its chemical composition and physical structure, and thus affecting the performance, making the test data unable to truly reflect the actual performance of the asphalt, and affecting the engineering quality assessment and material selection.

[0005] II. Inaccurate on-site observation

[0006] The existing observation method for on-site aging of asphalt is also limited, mostly through visual observation and simple hardness testing, which cannot accurately obtain the changes in the internal structure and performance of the asphalt, and is difficult to provide accurate aging information.

[0007] III. Low detection efficiency

[0008] The repeated heating process takes a long time, and combined with the limitations of the existing on-site observation method, the entire detection process is inefficient, which cannot meet the needs of the rapid development of engineering construction.

[0009] As can be seen from the above, the traditional asphalt test focuses on macroscopic performance testing, ignores the changes in the microstructure and the influence of heating on the performance of asphalt, and does not fundamentally solve the problems of repeated heating and on-site observation; at the same time, the traditional asphalt test is not only inefficient, but also has large detection result errors, which is difficult to meet the actual needs of engineering. SUMMARY

[0010] The technical problem to be solved by the present application is to provide a solid asphalt detection method, device and system based on magneto-rheological effect, which can realize the detection of asphalt rheological parameters and aging conditions.

[0011] In order to solve the above technical problems, the present application provides a solid asphalt detection method based on the magnetorheological effect, comprising: taking asphalt samples from the same-nourishing asphalt in the field and heating the asphalt samples to a flowing state; mixing and curing the magnetic powder with the asphalt samples in the flowing state to form a magnetorheological asphalt composite material sample; measuring the rheological parameters of the magnetorheological asphalt composite material sample under different magnetic field strengths; calculating the change rate of the rheological parameters; and evaluating the aging condition of the same-nourishing asphalt in the field according to the change rate of the rheological parameters and a preset standard curve, wherein the standard curve is used to record the relationship between the change rate of the rheological parameters and the aging degree of the asphalt.

[0012] As an improvement of the above scheme, the rheological parameters include viscosity and / or shear stress.

[0013] As an improvement of the above scheme, the step of mixing and curing the magnetic powder with the asphalt samples in the flowing state comprises: adding the magnetic powder to the asphalt samples in the flowing state; stirring the asphalt samples in the flowing state and the magnetic powder to uniformly disperse the magnetic powder in the asphalt samples in the flowing state to form a mixed sample; and pouring the mixed sample into a standard sample mold; and cooling and curing the mixed sample in the standard sample mold at room temperature to form the magnetorheological asphalt composite material sample.

[0014] As an improvement of the above scheme, the weight ratio of the magnetic powder to the asphalt samples in the flowing state is 3-5:100.

[0015] As an improvement of the above scheme, during the stirring process, the stirring speed is 2000-3000 revolutions per minute, and the stirring time is 10-15 minutes.

[0016] As an improvement of the above scheme, the step of measuring the rheological parameters of the magnetorheological asphalt under different magnetic field strengths comprises: placing the magnetorheological asphalt composite material sample on a test table of a rheological performance testing instrument; starting a magnetic field generating device and allowing the magnetic field generated by the magnetic field generating device to act on the magnetorheological asphalt composite material sample; gradually increasing the magnetic field strength of the magnetic field generated by the magnetic field generating device; and collecting the rheological parameters of the magnetorheological asphalt composite material sample under different magnetic field strengths by the rheological performance testing instrument.

[0017] As an improvement of the above scheme, before measuring the rheological parameters of the magnetorheological asphalt composite material sample under different magnetic field strengths, it further comprises: respectively calibrating the magnetic field generating device and the rheological performance testing instrument.

[0018] As an improvement of the above scheme, the change rate of the rheological parameters is positively correlated with the aging degree of the asphalt.

[0019] Correspondingly, the application further provides a solid asphalt detection device based on the magnetorheological effect, comprising: an acquisition module, configured to acquire rheological parameters of a magnetorheological asphalt composite sample under different magnetic field strengths, the magnetorheological asphalt composite sample being formed by mixing and curing magnetic powder and an asphalt sample in a flowing state, the asphalt sample in the flowing state being taken from a site asphalt and heated; a calculation module, configured to calculate a change rate of the rheological parameters; and an evaluation module, configured to evaluate an aging condition of the site asphalt according to the change rate of the rheological parameters and a preset standard curve, wherein the standard curve is used to record a relationship between the change rate of the rheological parameters and an aging degree of the asphalt.

[0020] Correspondingly, the application further provides a solid asphalt detection system based on the magnetorheological effect, comprising a heating device, a stirrer, a sample mold, a magnetic field generating device, a rheological performance testing instrument and the above-mentioned solid asphalt detection device based on the magnetorheological effect; the heating device is used to heat an asphalt sample to a flowable state; the stirrer is used to mix and process the magnetic powder and the asphalt sample in the flowable state; the sample mold is used to load the mixed and processed magnetic powder and the asphalt sample in the flowable state; the magnetic field generating device is used to generate different magnetic field strengths; and the rheological performance testing instrument is used to measure rheological parameters of the magnetorheological asphalt composite sample under different magnetic field strengths.

[0021] The application has the following beneficial effects:

[0022] The application only needs to heat the asphalt sample once, and can avoid the asphalt aging problem caused by repeated heating in the asphalt test; meanwhile, the application can accurately measure the change of the rheological performance of the asphalt by using the magnetorheological effect; the application further establishes the corresponding relationship between the rheological parameters and the aging degree of the asphalt, so as to realize the detection of the aging condition of the asphalt.

[0023] In addition, the solid asphalt detection system based on the magnetorheological effect of the application is small in size, convenient to carry and easy to operate, and can meet the demand of rapid detection on the engineering site. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 is a first embodiment flowchart of the solid asphalt detection method based on the magnetorheological effect of the application;

[0025] Figure 2 is a second embodiment flowchart of the solid asphalt detection method based on the magnetorheological effect of the application;

[0026] Figure 3 is an embodiment structure schematic diagram of the magnetic field generating device and the rheological performance testing instrument in the application;

[0027] Figure 4It is a schematic diagram of the structure of an embodiment of the solid asphalt detection equipment based on magnetorheological effect in the present invention. DETAILED DESCRIPTION

[0028] To make the objectives, technical solutions, and advantages of the present invention more apparent, the present invention will be further described in detail below with reference to the accompanying drawings. It is hereby stated that any directional terms such as "up," "down," "left," "right," "front," "back," "inside," and "outside" that appear or will appear herein are based solely on the accompanying drawings and are not intended to limit the present invention.

[0029] See also Figure 1 , Figure 1 The flowchart of the first embodiment of the solid asphalt detection method based on magnetorheological effect of the present invention is shown, which includes:

[0030] S101, taking an asphalt sample from the on-site homotrophic asphalt and heating the asphalt sample to a fluid state;

[0031] During the test, first take out an appropriate amount of asphalt sample from the on-site homotrophic asphalt and heat the asphalt sample to a flowable state; during the heating process, the heating time should be shortened as much as possible to reduce the impact of aging.

[0032] S102, mixing the magnetic powder with the asphalt sample in a flowing state and performing a solidification treatment to form a magnetorheological asphalt composite material sample;

[0033] Accordingly, the steps of mixing the magnetic powder with the asphalt sample in a flowing state and solidifying the asphalt sample include:

[0034] (1) Add magnetic powder to the flowing asphalt sample;

[0035] Generally, magnetic powder can be added to a flowing asphalt sample in a predetermined ratio. Preferably, the weight ratio of magnetic powder to flowing asphalt sample is 3-5:100, meaning 3-5g of magnetic powder is added for every 100g of asphalt sample. The magnetic powder is made of a permanent magnetic material.

[0036] (2) Stirring the asphalt sample and magnetic powder in a flowing state, and uniformly dispersing the magnetic powder in the asphalt sample in a flowing state to form a mixed sample;

[0037] During the stirring process, the mixture may be stirred with the aid of a stirrer; wherein the rotation speed of the stirrer is adjustable to ensure that the magnetic powder is evenly mixed in the asphalt sample.

[0038] During the stirring process, the stirring speed is preferably 2000-3000 rpm, and the stirring time is preferably 10-15 minutes, so that the magnetic powder is evenly dispersed in the asphalt sample.

[0039] It should be noted that the stirring speed of 2000-3000 rpm can ensure that the magnetic powder is quickly and uniformly dispersed in the asphalt to form a stable magnetorheological composite material, avoiding the agglomeration or sedimentation of the magnetic powder caused by low-speed stirring, and avoiding the introduction of too many bubbles or the intensification of asphalt thermal oxidation due to too high speed. When the stirring speed is less than 2000 rpm, the stirring intensity is insufficient, the magnetic powder is easy to agglomerate or sediment, resulting in uneven composite material and unstable magnetorheological effect, and the rheological parameter measurement results fluctuate greatly; when the stirring speed is greater than 3000 rpm, the asphalt molecular chain may be broken, additional thermal aging is introduced, and air is easily entrained to form bubbles, which interfere with the rheological test (such as bubbles reducing the true shear stress during viscosity measurement).

[0040] In addition, the stirring time of 10-15 minutes can make the magnetic powder and asphalt fully mixed to ensure uniform distribution of the magnetic powder, avoid measurement deviation of the rheological parameters caused by uneven mixing, and control the heating time to reduce the risk of asphalt thermal aging; when the stirring time is less than 10 minutes, the magnetic powder is not fully dispersed, the local concentration is uneven, and the rheological response under the magnetic field is inconsistent, resulting in poor repeatability of the measurement results; when the stirring time is greater than 15 minutes, the heating time is prolonged, the risk of asphalt oxidation is increased, and the purpose of reducing thermal aging is violated.

[0041] (3) Pour the mixed sample into a standard sample mold;

[0042] The use of a standard sample mold can produce magnetorheological asphalt composite material samples with uniform size, facilitating subsequent testing and data comparison.

[0043] (4) The mixed sample in the standard sample mold is rapidly cooled and solidified at room temperature to form a magnetorheological asphalt composite material sample.

[0044] S103, measure the rheological parameters of the magnetorheological asphalt composite material sample under different magnetic field strengths;

[0045] It should be noted that the rheological parameters include viscosity and / or shear stress, i.e., the viscosity of the magnetorheological asphalt composite material sample under different magnetic field strengths can be measured alone, the shear stress of the magnetorheological asphalt composite material sample under different magnetic field strengths can be measured alone, or the viscosity and shear stress of the magnetorheological asphalt composite material sample under different magnetic field strengths can be measured simultaneously.

[0046] Correspondingly, the step of measuring the rheological parameters of the magnetorheological asphalt composite material sample under different magnetic field strengths includes:

[0047] (1) Place the magnetorheological asphalt composite material sample on the test table of the rheological performance testing instrument;

[0048] (2) starting the magnetic field generating device and causing the magnetic field generated by the magnetic field generating device to act on the magnetorheological asphalt composite material sample;

[0049] (3) gradually increasing the magnetic field strength of the magnetic field generated by the magnetic field generating device;

[0050] (4) The rheological parameters of magnetorheological asphalt composite samples under different magnetic field intensities were collected by rheological performance testing instruments.

[0051] For example, when starting the magnetic field generating device, the initial magnetic field strength can be set to 0.5 Tesla; after completing the setting of the initial magnetic field strength, the initial viscosity of the magnetorheological asphalt composite material sample under the initial magnetic field strength of 0.5 Tesla can be collected by the rheological performance testing instrument. and / or initial shear stress ; Then, gradually increase the magnetic field strength by 0.5 Tesla each time, and measure the corresponding viscosity at each magnetic field strength and / or shear stress , and record the changes in rheological parameters under different magnetic field intensities.

[0052] It should be noted that when the initial magnetic field strength is set to less than 0.5 Tesla, the magnetic field strength is too low, the magnetic powder is not sufficiently oriented, and the rheological parameter change amplitude is small, which may be lower than the instrument detection accuracy, resulting in measurement errors or inability to capture effective signals; when the initial magnetic field strength is set to greater than 0.5 Tesla, the initial magnetic field is too strong, causing the magnetic powder to quickly form a tight chain structure, resulting in a sudden increase in rheological parameters (such as viscosity), exceeding the upper limit of the instrument range; when the magnetic field is subsequently increased step by step, the response range is limited, and it is difficult to distinguish the rheological differences of asphalt with different aging degrees; therefore, the present invention sets the initial magnetic field strength to 0.5 Tesla, wherein 0.5 Tesla can trigger an obvious magnetorheological effect (the magnetic powder begins to be oriented, changing the viscosity and shear stress of the asphalt), and avoid the magnetic field being too strong, causing the rheological parameters to exceed the measurement range of the instrument, and ensure that the data has a linear response when the magnetic field is subsequently increased step by step.

[0053] S104, calculating the rate of change of rheological parameters;

[0054] According to the measured rheological parameter data, the change rate of the rheological parameters is calculated:

[0055] For example, the viscosity change rate can be calculated according to the following formula :

[0056]

[0057] in, is the initial viscosity, For the The viscosity after increasing the magnetic field strength.

[0058] For example, the shear stress change rate can be calculated according to the following formula :

[0059]

[0060] wherein, is the initial shear stress, is the shear stress after the magnetic field strength is increased for the nth time.

[0061] S105, evaluating the aging condition of the site asphalt in place according to the change rate of the rheological parameter and the preset standard curve.

[0062] It should be noted that the standard curve is used to record the relationship between the change rate of the rheological parameter and the aging degree of the asphalt; wherein, the standard curve can be obtained by fitting a large number of test data of asphalt samples of different aging degrees.

[0063] Since the rheological parameter includes viscosity and / or shear stress, the standard curve also includes a viscosity standard curve and / or a shear stress standard curve.

[0064] The specific fitting process of the standard curve is as follows:

[0065] (1.1) Prepare standard asphalt samples of different aging degrees:

[0066] Prepare a series of asphalt samples through artificial aging tests (such as rotary thin film oven aging, ultraviolet aging), control the aging time (such as 0h, 20h, 40h, 60h) or aging index (such as mass loss rate, viscosity ratio) as the known aging degree benchmark;

[0067] (1.2) Prepare the magnetorheological composite material:

[0068] Mix the magnetic powder with the asphalt of each aging degree according to the method, control the magnetic powder ratio (3~5:100), stirring speed (2000~3000 revolutions / minute) and time (10~15 minutes) to be consistent, and ensure the standardization of sample preparation;

[0069] (1.3) Measure the change rate of the rheological parameter:

[0070] Apply a 0~3T step-by-step increasing magnetic field to each sample, record the viscosity and shear stress under different magnetic fields, and calculate Δη and Δτ (see the calculation method in the above).

[0071] (1.4) Data fitting:

[0072] Take the aging degree (such as aging time, aging index) as the ordinate, take Δη or Δτ as the abscissa, and establish a standard curve through linear regression or polynomial fitting;​

[0073] For example, the model example: aging index = k1 x Δη + b1; wherein, Δη = (ηi-η0) x 100% / η0, η0 is the initial viscosity, ηi is the i level magnetic field viscosity, k1, b1 is the fitting coefficient;

[0074] Generally, aging makes the asphalt molecular chain crosslinking, the polarity group increases, the magnetic powder and the asphalt interaction enhances, the viscosity increment under the magnetic field is bigger.

[0075] For example, the model example: aging index = k2 x Δτ + b2; wherein, Δτ = (τi-τ0) x 100% / τ0, τ0 is the initial shear stress, τi is the i level magnetic field shear stress, k2, b2 is the fitting coefficient;

[0076] Generally, aging makes the asphalt internal structure hardening, and the shear stress increases faster with the magnetic field.

[0077] That is, the independent variable of the fitting process is: magnetic field intensity (0.5T, 1.0T, 1.5T, etc.), the change rate of rheological parameters (Δη, Δτ); dependent variable: quantification index of asphalt aging degree (such as aging time, aging index based on ductility / softening point); the fitting method is: least square fitting, the best mathematical relationship between the change rate and the aging degree is determined by statistical analysis, to ensure the accuracy and universality of the standard curve.

[0078] Correspondingly, the change rate of rheological parameters is positively correlated with the aging degree of asphalt; that is, the greater the change rate of rheological parameters, the higher the aging degree of asphalt, and the smaller the change rate of rheological parameters, the lower the aging degree of asphalt.

[0079] In the evaluation process, the change rate of rheological parameters tested in real time can be compared with the change rate of rheological parameters recorded in the standard curve to find the aging degree corresponding to the change rate of rheological parameters, so as to realize the accurate detection of the aging degree of solid asphalt.

[0080] As can be seen from the above, the present application uses the magneto-rheological effect, uniformly mixes the magnetic powder made of permanent magnetic material into the asphalt sample, and forms a magneto-rheological asphalt composite material. Under the action of external magnetic field, the magnetic powder will form a specific structure in the asphalt, changing the rheological properties of the asphalt. With the aging of asphalt, the internal structure change will cause the corresponding change of the magneto-rheological effect. By measuring the rheological parameters (such as viscosity, shear stress, etc.) of the magneto-rheological asphalt composite material under different magnetic field conditions, and establishing the corresponding relationship between the rheological parameters and the aging degree of asphalt, the detection of the aging condition of asphalt is realized.

[0081] Reference Figure 2 , Figure 2A second embodiment flow chart of the solid asphalt detection method based on the magneto-rheological effect of the present application is shown, which comprises:

[0082] S201, an asphalt sample is taken from the site and heated to a flowing state;

[0083] S202, the magnetic powder is mixed with the asphalt sample in a flowing state and solidified to form a magneto-rheological asphalt composite sample;

[0084] S203, the magnetic field generating device and the rheological property testing instrument are calibrated respectively;

[0085] And Figure 1 Unlike the first embodiment shown, the embodiment needs to calibrate the magnetic field generating device and the rheological property testing instrument before use, that is, calibrate the magnetic field strength and rheological parameter measurement with a standard sample to ensure the accuracy of the equipment measurement.

[0086] S204, the rheological parameters of the magneto-rheological asphalt composite sample under different magnetic field strengths are measured;

[0087] S205, the change rate of the rheological parameters is calculated;

[0088] S206, the aging condition of the site asphalt is evaluated according to the change rate of the rheological parameters and the preset standard curve.

[0089] Therefore, the present application can avoid the problem of asphalt aging caused by repeated heating in asphalt testing by using the magneto-rheological effect, ensuring the accuracy and reliability of the test results (such as viscosity, initial shear stress); at the same time, the present application can observe the aging condition of the site asphalt in real time and accurately, providing more scientific asphalt performance data for road construction, building waterproof engineering and other engineering, helping to improve the engineering quality and optimize the selection of materials.

[0090] Referring to Figure 3 and Figure 4 , Figure 3 and Figure 4 The specific structure of the solid asphalt detection system based on the magneto-rheological effect of the present application is shown, which comprises a heating device, a stirrer, a sample mold, a magnetic field generating device 1, a rheological property testing instrument 2 and a solid asphalt detection device based on the magneto-rheological effect 3.

[0091] The heating device, the stirrer, the sample mold, the magnetic field generating device 1, the rheological property testing instrument 2 and the solid asphalt detection device based on the magneto-rheological effect 3 will be described in detail as follows:

[0092] I. Heating device

[0093] The heating device is used for heating the asphalt sample to a flowable state.

[0094] II. The stirrer

[0095] The stirrer is used for mixing the magnetic powder with the asphalt sample in a flowable state; preferably, the stirrer in the embodiment can adopt a high-speed shearing stirrer, and the stirring speed of the stirrer can be adjusted to ensure uniform dispersion of the magnetic powder in the asphalt sample.

[0096] III. The sample mold

[0097] The sample mold is used for loading the mixed magnetic powder and the asphalt sample in a flowable state.

[0098] Through the standard sample mold, the magnetorheological asphalt composite material sample with uniform size can be easily made, which provides guarantee for subsequent testing and data comparison.

[0099] IV. The magnetic field generating device

[0100] The magnetic field generating device 1 is used for generating different magnetic field strengths.

[0101] As shown in Figure 3 , the magnetic field generating device 1 includes two oppositely arranged adjustable circular ring type permanent magnets 11, which are compact in structure and convenient to carry to the scene for use; at the same time, the circular ring type permanent magnets 11 can generate a continuously adjustable magnetic field strength in the range of 0~3 Tesla.

[0102] V. The rheological property testing instrument

[0103] The rheological property testing instrument 2 is used for measuring the rheological parameters of the magnetorheological asphalt composite material sample under different magnetic field strengths.

[0104] In the embodiment, the rheological property testing instrument 2 can be a rheometer, which has a high-precision sensor and can accurately measure the viscosity, shear stress and other parameters of the sample.

[0105] VI. The solid asphalt detection equipment based on the magnetorheological effect

[0106] As shown in Figure 4 , the solid asphalt detection equipment based on the magnetorheological effect 3 includes:

[0107] The acquisition module 31 is used for acquiring the rheological parameters of the magnetorheological asphalt composite material sample under different magnetic field strengths; wherein the magnetorheological asphalt composite material sample is mixed and solidified from the magnetic powder and the asphalt sample in a flowable state, and the asphalt sample in a flowable state is taken from the site and heated from the site asphalt;

[0108] The calculation module 32 is used for calculating the change rate of the rheological parameters; it should be noted that the rheological parameters include viscosity and / or shear stress, and the viscosity change rate The calculation formula is: , shear stress change rate The calculation formula is: ,in, is the initial viscosity, For the The viscosity after increasing the magnetic field strength, is the initial shear stress, For the The shear stress after increasing the magnetic field strength.

[0109] The evaluation module 33 evaluates the aging of the on-site homotrophic asphalt based on the rate of change of the rheological parameters and a preset standard curve; wherein, the standard curve is used to record the relationship between the rate of change of the rheological parameters and the degree of aging of the asphalt, and the standard curve can be obtained by fitting a large number of test data of asphalt samples with different degrees of aging; accordingly, the rate of change of the rheological parameters is positively correlated with the degree of aging of the asphalt; that is, the greater the rate of change of the rheological parameters, the higher the degree of aging of the asphalt, and the smaller the rate of change of the rheological parameters, the lower the degree of aging of the asphalt.

[0110] During operation, first take out an appropriate amount of asphalt sample from the on-site homotrophic asphalt, and heat the asphalt sample to a flowable state through a heating device; then, add magnetic powder to the asphalt sample in a flowing state according to a preset ratio, and use a stirrer to stir the asphalt sample and magnetic powder for 10 to 15 minutes at a stirring speed of 2000 to 3000 rpm, and make the magnetic powder evenly dispersed in the asphalt sample in a flowing state to form a mixed sample; then, pour the mixed sample into a standard sample mold, and quickly cool and solidify at room temperature to form a magnetorheological asphalt composite material sample; then, calibrate the magnetic field generating device 1 and the rheological performance testing instrument 2 respectively; then, the magnetorheological asphalt The composite material sample is placed on the test bench 21 of the rheological properties testing instrument 2, the magnetic field generating device 1 is started and the initial magnetic field strength is set to 0.5 Tesla, and then the initial viscosity and initial shear stress of the magnetorheological asphalt composite material sample are collected by the rheological properties testing instrument 2; then, the magnetic field generating device 1 is adjusted to gradually increase the magnetic field strength, increasing by 0.5 Tesla each time, and the corresponding viscosity and shear stress are measured by the rheological properties testing instrument 2 at each magnetic field strength, and the changes in rheological parameters under different magnetic field strengths are recorded; finally, the change rate of the rheological parameters is calculated by the solid asphalt detection equipment 3, and the aging of the on-site homotrophic asphalt is evaluated based on the change rate of the rheological parameters and the preset standard curve.

[0111] In summary, the present invention has the following beneficial effects:

[0112] I. Avoid the influence of aging. The whole detection process does not need to heat the asphalt repeatedly, and the rheological property change of asphalt is accurately measured through the magneto-rheological effect, which effectively avoids the problem of asphalt aging caused by heating, and ensures that the detection result can truly reflect the actual performance of asphalt.

[0113] II. Precise observation on site. The same asphalt is detected on site, and the aging condition of the asphalt is accurately observed through the magneto-rheological effect, so as to provide timely and accurate asphalt performance data for the engineering site.

[0114] III. Simple and efficient operation. The detection equipment is miniaturized and portable, the operation is simple, the detection process is relatively fast, the detection efficiency can be improved, and the demand of rapid detection on the engineering site can be met.

[0115] The above is the preferred embodiment of the present application. It should be noted that for ordinary skilled persons in the technical field, several improvements and refinements can be made without departing from the principles of the present application, and these improvements and refinements are also considered within the protection scope of the present application.

Claims

1. A solid-state asphalt detection method based on the magnetorheological effect, characterized in that, The method comprises the following steps: taking asphalt samples from the field asphalt and heating the asphalt samples to a flowable state; mixing and curing the magnetic powder with the asphalt samples in the flowable state to form a magneto-rheological asphalt composite sample; measuring the rheological parameters of the magneto-rheological asphalt composite sample under different magnetic field strengths; calculating the rate of change of the rheological parameters; evaluating the aging condition of the field asphalt according to the rate of change of the rheological parameters and a preset standard curve, wherein the standard curve records the relationship between the rate of change of the rheological parameters and the aging degree of the asphalt.

2. The method for solid asphalt detection based on magneto rheological effect according to claim 1, characterized in that, The rheological parameters include viscosity and / or shear stress.

3. The solid-state asphalt detection method based on the magnetorheological effect according to claim 1 or 2, characterized in that, The step of mixing and curing the magnetic powder with the asphalt samples in the flowable state comprises the following steps: adding the magnetic powder to the asphalt samples in the flowable state; stirring the asphalt samples in the flowable state and the magnetic powder to uniformly disperse the magnetic powder in the asphalt samples in the flowable state to form a mixed sample; pouring the mixed sample into a standard sample mold; cooling and curing the mixed sample in the standard sample mold at room temperature to form a magneto-rheological asphalt composite sample.

4. The solid-state asphalt detection method based on the magnetorheological effect according to claim 3, characterized in that, The weight ratio of the magnetic powder to the asphalt samples in the flowable state is 3-5:

100.

5. The solid-state asphalt detection method based on the magnetorheological effect according to claim 3, characterized in that, During the stirring process, the stirring speed is 2000-3000 rpm, and the stirring time is 10-15 minutes.

6. The solid-state asphalt detection method based on the magnetorheological effect according to claim 1 or 2, characterized in that, The step of measuring the rheological parameters of the magneto-rheological asphalt under different magnetic field strengths comprises the following steps: placing the magneto-rheological asphalt composite sample on a test table of a rheological performance testing instrument; starting a magnetic field generating device and allowing the magnetic field generated by the magnetic field generating device to act on the magneto-rheological asphalt composite sample; gradually increasing the magnetic field strength of the magnetic field generated by the magnetic field generating device; collecting the rheological parameters of the magneto-rheological asphalt composite sample under different magnetic field strengths by the rheological performance testing instrument.

7. The method for solid bitumen detection based on magneto rheological effect as claimed in claim 6, wherein, Before measuring the rheological parameters of the magneto-rheological asphalt composite sample under different magnetic field strengths, the magnetic field generating device and the rheological performance testing instrument are calibrated respectively.

8. The solid-state asphalt detection method based on the magnetorheological effect according to claim 1 or 2, characterized in that, The rate of change of the rheological parameters is positively correlated with the aging degree of the asphalt.

9. A solid-state asphalt detection device based on the magneto- rheological effect, characterized in that, The method comprises the following steps: an acquisition module for acquiring the rheological parameters of a magneto-rheological asphalt composite sample under different magnetic field strengths, wherein the magneto-rheological asphalt composite sample is formed by mixing and curing magnetic powder with asphalt samples in a flowable state, and the asphalt samples in the flowable state are taken from field asphalt and heated; a calculation module for calculating the rate of change of the rheological parameters; an evaluation module for evaluating the aging condition of the field asphalt according to the rate of change of the rheological parameters and a preset standard curve, wherein the standard curve records the relationship between the rate of change of the rheological parameters and the aging degree of the asphalt.

10. A solid-state asphalt detection system based on magneto rheological effect characterized in that, The method comprises the following steps: a heating device for heating asphalt samples to a flowable state; a stirrer for mixing the magnetic powder with the asphalt samples in the flowable state; a sample mold; The sample mold is used for loading the mixed processed magnetic powder and the asphalt sample in a flowing state; The magnetic field generating device is used for generating different magnetic field strengths; The rheological performance testing instrument is used for measuring the rheological parameters of the magneto-rheological asphalt composite material sample under different magnetic field strengths.

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