A method, device, equipment and medium for detecting brittleness of asphalt concrete

Abstract

The application discloses a kind of asphalt concrete brittleness detection method, device, equipment and medium, applied to highway engineering technical field.The asphalt concrete brittleness detection method provided in the application first carries out semicircle bending test to asphalt concrete, obtains the load-displacement diagram of asphalt concrete after semicircle bending test, according to load-displacement diagram, the plastic work before asphalt concrete cracking, the elastic work before asphalt concrete cracking and the load work after reaching peak value are calculated, then according to plastic work, elastic work and load work determine plastic dissipation energy, elastic strain energy and post-peak dissipation energy, calculate brittleness index by the plastic dissipation energy of asphalt concrete, elastic strain energy and post-peak dissipation energy.The brittleness index can consider different types of energy in semicircle bending test, and the fracture brittleness of the same kind of asphalt concrete under different temperatures or different kinds of asphalt concrete under the same temperature can also be compared.

Description

Technical Field

[0001] This application relates to the field of highway engineering technology, and in particular to a method, apparatus, equipment and medium for testing the brittleness of asphalt concrete. Background Technology

[0002] Asphalt concrete is a mixture made by artificially selecting mineral aggregates, crushed stone or crushed gravel, stone chips or sand, mineral powder, etc., with a certain gradation, and mixing them with a certain proportion of road asphalt materials under strictly controlled conditions. Asphalt concrete is a major construction material for highways. At the same time, low-temperature cracking of asphalt concrete is one of the main forms of distress in asphalt pavements. Due to the heat transfer properties of asphalt concrete, when the temperature drops and the tensile stress of the asphalt concrete exceeds its ultimate tensile strength, temperature cracks will occur. Asphalt concrete exhibits different fracture characteristics at different temperatures. For example, fracture at low temperatures shows obvious brittleness, while fracture at medium temperatures shows a certain degree of plasticity.

[0003] In recent years, the proportion of highway maintenance mileage in my country's total highway mileage has been increasing, and pavement cracking is a major concern in asphalt pavement maintenance. Cracking of asphalt pavements not only severely affects pavement durability and driving comfort but also imposes a significant economic burden. Therefore, it is necessary to study the cracking performance of asphalt concrete to extend the service life of asphalt pavements. Currently, the semi-circular bending test is used to evaluate the crack resistance of asphalt concrete. However, the indicators used in the semi-circular bending test do not take into account the changes in different types of energy during the test; they only use characteristic points on the load-displacement curve.

[0004] In view of the above-mentioned technologies, finding a method, device, equipment and medium for testing the brittleness of asphalt concrete is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] The purpose of this application is to provide a method, apparatus, equipment and medium for testing the brittleness of asphalt concrete, which takes into account the energy measured in the semi-circular bending test, calculates the brittleness index by plastic dissipation energy, elastic strain energy and post-peak dissipation energy, and evaluates the fracture brittleness of asphalt concrete by the calculated brittleness index.

[0006] To address the aforementioned technical problems, this application provides a method for testing the brittleness of asphalt concrete, comprising:

[0007] Obtain the load-displacement diagram of asphalt concrete after a semi-circular bending test.

[0008] The plastic work, elastic work, and load work after reaching the peak value of asphalt concrete before cracking are determined based on the load-displacement diagram.

[0009] The plastic dissipation energy, elastic strain energy, and peak dissipation energy are determined based on plastic work, elastic work, and load work.

[0010] The brittleness index is determined by the plastic dissipation energy, elastic strain energy, and peak dissipation energy of asphalt concrete.

[0011] Preferably, after obtaining the load-displacement diagram of the asphalt concrete after the semi-circular bending test, the method further includes:

[0012] Determine the peak point and peak load in the load-displacement diagram;

[0013] Select the peak load of the preset interval;

[0014] Draw a straight line intersecting the horizontal axis at a point based on the slope of the peak point and the preset interval;

[0015] Draw a perpendicular line from the peak point to the horizontal axis, intersecting the horizontal axis at another point.

[0016] Preferably, determining the plastic work before cracking, the elastic work before cracking, and the load work after reaching the peak value of the asphalt concrete based on the load-displacement diagram includes:

[0017] The area enclosed by a point on the horizontal axis formed by drawing a straight line from the origin, peak point, peak point, and the slope of the preset interval of the load-displacement diagram is taken as the plastic work.

[0018] The area enclosed by the intersection of a straight line drawn from the peak point, the slope of the peak point and the preset interval, and a point on the horizontal axis, and the perpendicular line drawn from the peak point to the horizontal axis, is taken as the elastic work.

[0019] The area enclosed by the peak point, the intersection of the perpendicular line drawn from the peak point to the horizontal axis, and the points where the load-displacement diagram intersects the horizontal axis excluding the origin, is taken as the load work.

[0020] Preferably, determining the plastic dissipation energy, elastic strain energy, and post-peak dissipation energy based on plastic work, elastic work, and load work includes:

[0021] Obtain the area of ​​the uncracked crack zone in asphalt concrete;

[0022] The ratio of plastic work to the area of ​​the uncracked crack zone is taken as plastic dissipation energy.

[0023] The elastic strain energy is obtained by dividing the elastic work by the area of ​​the unopened crack zone.

[0024] The ratio of the load work to the area of ​​the uncracked crack zone is used as the dissipated energy.

[0025] Preferably, before determining the brittleness index using the plastic dissipation energy, elastic strain energy, and peak post-peak dissipation energy of asphalt concrete, the method further includes:

[0026] Obtain the deformation value and unloading stiffness corresponding to the peak load point.

[0027] Preferably, determining the brittleness index using the plastic dissipation energy, elastic strain energy, and post-peak dissipation energy of asphalt concrete includes:

[0028] Obtain the product of the sum of the plastic dissipation energy and the dissipation energy after the peak and the deformation value;

[0029] The product of elastic strain energy and brittleness index is used as the value of the product.

[0030] Preferably, the elastic strain energy is the square of the corresponding work divided by the product of twice the unloading stiffness and the area of ​​the uncracked crack zone.

[0031] To address the aforementioned technical problems, this application also provides a device for testing the brittleness of asphalt concrete, comprising:

[0032] The acquisition module is used to obtain the load-displacement diagram of asphalt concrete after a semi-circular bending test.

[0033] The first determination module is used to determine the plastic work, elastic work, and load work after the asphalt concrete reaches its peak value before cracking, based on the load-displacement diagram.

[0034] The second determining module is used to determine the plastic dissipation energy, elastic strain energy, and peak dissipation energy based on plastic work, elastic work, and load work.

[0035] The third determination module is used to determine the brittleness index by the plastic dissipation energy, elastic strain energy and peak dissipation energy of asphalt concrete.

[0036] To address the aforementioned technical problems, this application also provides a testing device for the brittleness of asphalt concrete, including a memory for storing computer programs;

[0037] A processor is used to execute computer programs to implement the steps of the method for detecting the brittleness of asphalt concrete as described above.

[0038] To address the aforementioned technical problems, this application also provides a computer-readable storage medium storing a computer program, which, when executed by a processor, implements the steps of the asphalt concrete brittleness detection method described above.

[0039] This application provides a method for testing the brittleness of asphalt concrete. First, a semi-circular bending test is conducted on the asphalt concrete to obtain a load-displacement diagram. Based on the load-displacement diagram, the plastic work before cracking, the elastic work before cracking, and the load work after reaching the peak value are calculated. Then, the plastic dissipation energy, elastic strain energy, and post-peak dissipation energy are determined based on the plastic work, elastic strain energy, and load work. Finally, the brittleness index is calculated using the plastic dissipation energy, elastic strain energy, and post-peak dissipation energy of the asphalt concrete. The brittleness index allows for the consideration of different types of energy in the semi-circular bending test and enables comparison of the fracture brittleness of the same type of asphalt concrete at different temperatures or different types of asphalt concrete at the same temperature. The larger the brittleness index, the greater the fracture brittleness of the asphalt concrete.

[0040] This application also provides a device, equipment and medium for testing the brittleness of asphalt concrete, which corresponds to the testing method for the brittleness of asphalt concrete, and therefore has the same beneficial effects as the testing method for the brittleness of asphalt concrete. Attached Figure Description

[0041] To more clearly illustrate the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0042] Figure 1 A flowchart of a method for testing the brittleness of asphalt concrete provided in an embodiment of this application;

[0043] Figure 2 A diagram of a semi-circular bending specimen provided in an embodiment of this application;

[0044] Figure 3 Load-displacement diagram of a notched semicircular bending specimen provided in an embodiment of this application;

[0045] Figure 4 This is a graph showing the aggregate gradation of an asphalt mixture according to another embodiment of this application.

[0046] Figure 5 A semi-circular bending test diagram provided for another embodiment of this application;

[0047] Figure 6 The brittleness index of asphalt mixture at -10°C is provided in another embodiment of this application;

[0048] Figure 7 The brittleness index of asphalt mixture at 0°C is provided in another embodiment of this application;

[0049] Figure 8The brittleness index of asphalt mixture at 25°C is provided in another embodiment of this application;

[0050] Figure 9 A structural diagram of a device for detecting the brittleness of asphalt concrete provided in another embodiment of this application;

[0051] Figure 10 A structural diagram of a device for testing the brittleness of asphalt concrete provided in another embodiment of this application. Detailed Implementation

[0052] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this application.

[0053] Due to the heat transfer properties of asphalt concrete, temperature cracks will occur when the temperature drops to a point where the tensile stress exceeds the ultimate tensile strength. Low-temperature cracking of asphalt concrete is one of the main forms of distress in asphalt pavements. Asphalt concrete exhibits different fracture characteristics at different temperatures, with low-temperature fractures showing significant brittleness. In recent years, the application of the semi-circular bending test in evaluating the crack resistance of asphalt mixtures has become increasingly widespread. Different indices are used to evaluate the crack resistance of asphalt mixtures based on the load-displacement curves obtained from the semi-circular bending test. However, the currently used indices do not consider the changes in different types of energy during the semi-circular bending test, but only use characteristic points on the load-displacement curve.

[0054] The core of this application is to provide a method, apparatus, equipment and medium for testing the brittleness of asphalt concrete, which can take into account the changes of different types of energy during the semi-circular bending test, calculate the brittleness index, and reflect the fracture brittleness of asphalt concrete based on the brittleness index.

[0055] To enable those skilled in the art to better understand the present application, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0056] This application provides a method for testing the brittleness of asphalt concrete. Figure 1 This is a flowchart of a method for testing the brittleness of asphalt concrete provided in an embodiment of this application; as shown below. Figure 1 As shown, the method includes the following steps:

[0057] S10: Obtain the load-displacement diagram of asphalt concrete after a semi-circular bending test.

[0058] This application requires a semi-circular bending test on asphalt concrete. The asphalt concrete can be ordinary dense-graded asphalt concrete, or SMA, warm-mix asphalt concrete, or recycled asphalt mixture. The porosity of the asphalt concrete is between 3% and 7%. In this embodiment, the semi-circular bending test is performed on the asphalt concrete. The required specimen is a notched semi-circular specimen with a radius of 75 mm, a notch length between 5 and 25 mm, and a thickness between 25 and 55 mm.

[0059] This embodiment focuses on the semi-circular bending test, which can evaluate the performance of Type I fracture, Type II fracture, and Type I-II combined fracture. Figure 2 A diagram of a semi-circular bending specimen provided in an embodiment of this application; as shown. Figure 2 As shown, when S1=S2, the specimen fails as a Type I failure; when S1 is not equal to S2, the failure is a combined Type I-II failure or a pure Type II failure. A load-displacement diagram will be obtained by subjecting asphalt concrete to a semi-circular bending test. Figure 3 Load-displacement diagram of a notched semi-circular bending specimen provided in an embodiment of this application.

[0060] S11: Determine the plastic work before cracking of asphalt concrete, the elastic work before cracking of asphalt concrete, and the load work after reaching the peak value based on the load-displacement diagram.

[0061] After obtaining the load-displacement diagram of the asphalt concrete after the semi-circular bending test in step S10, it is necessary to calculate the plastic work before cracking, the elastic supply before cracking, and the load work after reaching the peak value based on the load-displacement diagram. Let W be the plastic work before cracking. d Elastic work W before asphalt concrete cracks e The load power W after the peak p .

[0062] It should be noted that the plastic work W of the asphalt concrete before cracking provided in this embodiment... d and elastic work W e It relates to plastic deformation and elastic deformation. Elastic deformation occurs when an object is subjected to external forces and deforms. If the external force is removed, the object can completely return to its original shape and size. Plastic deformation refers to the deformation that occurs when a material deforms under external forces, but the elastic deformation disappears after the force is removed, leaving only the portion of deformation that cannot be recovered. Load refers to external forces and other factors that cause internal forces and deformations in a structure or component, or to various direct actions applied to an engineering structure that produce effects on the structure or component. Loads include forces, bending moments, and couples.

[0063] S12: Determine the plastic dissipation energy, elastic strain energy, and peak dissipation energy based on plastic work, elastic work, and load work.

[0064] In practice, the plastic work W of asphalt concrete before cracking is calculated using a load-displacement diagram. d Elastic work W e and load work W p And based on the plastic work W before asphalt concrete cracks d Elastic work W e and load work W p Calculate the plastic dissipation energy before cracking, the elastic strain energy before cracking, and the dissipation energy after the peak value of asphalt concrete. Let U be the plastic dissipation energy before cracking, the elastic strain energy before cracking, and the dissipation energy after the peak value of asphalt concrete. d U e and U p .

[0065] S13: The brittleness index is determined by the plastic dissipation energy, elastic strain energy, and peak dissipation energy of asphalt concrete.

[0066] The brittleness index proposed in this embodiment can evaluate the fracture brittleness of asphalt concrete. In addition, the brittleness index can also be combined with the results of the semi-circular bending test to evaluate the performance of Type I fracture, Type II fracture, and Type I-II composite fracture.

[0067] This application provides a method for testing the brittleness of asphalt concrete. First, a semi-circular bending test is conducted on the asphalt concrete to obtain a load-displacement diagram. Based on the load-displacement diagram, the plastic work before cracking, the elastic work before cracking, and the load work after reaching the peak value are calculated. Then, the plastic dissipation energy, elastic strain energy, and post-peak dissipation energy are determined based on the plastic work, elastic strain energy, and load work. Finally, the brittleness index is calculated using the plastic dissipation energy, elastic strain energy, and post-peak dissipation energy of the asphalt concrete. The brittleness index allows for the consideration of different types of energy in the semi-circular bending test and enables comparison of the fracture brittleness of the same type of asphalt concrete at different temperatures or different types of asphalt concrete at the same temperature. The larger the brittleness index, the greater the fracture brittleness of the asphalt concrete.

[0068] The above embodiments provide a detailed description of the method for detecting the brittleness of asphalt concrete. Based on the above embodiments, as a preferred embodiment, after obtaining the load-displacement diagram of the asphalt concrete after a semi-circular bending test, this embodiment further includes:

[0069] Determine the peak point and peak load in the load-displacement diagram;

[0070] Select the peak load of the preset interval;

[0071] Draw a straight line intersecting the horizontal axis at a point based on the slope of the peak point and the preset interval;

[0072] Draw a perpendicular line from the peak point to the horizontal axis, intersecting the horizontal axis at another point.

[0073] In practice Figure 3 This is a load-displacement diagram for a notched semicircular bending specimen, where the displacement is the displacement of the loading point, point C is the peak point, and the corresponding load is the peak load. The interval 30%-60% of the peak load in the load-displacement diagram obtained from the experiment is selected, i.e., segment AB. The slope of segment AB is calculated, and a straight line is drawn from the peak load point C with the slope of AB intersecting the horizontal axis at a point denoted as point D. A perpendicular line is drawn from point C to the horizontal axis intersecting another point denoted as point E.

[0074] Furthermore, based on the load-displacement diagram, the plastic work before cracking of asphalt concrete, the elastic work before cracking of asphalt concrete, and the load work after reaching the peak value are specifically determined as follows:

[0075] The area enclosed by a point on the horizontal axis formed by drawing a straight line from the origin, peak point, peak point, and the slope of the preset interval of the load-displacement diagram is taken as the plastic work.

[0076] The area enclosed by the intersection of a straight line drawn from the peak point, the slope of the peak point and the preset interval, and a point on the horizontal axis, and the perpendicular line drawn from the peak point to the horizontal axis, is taken as the elastic work.

[0077] The area enclosed by the peak point, the intersection of the perpendicular line drawn from the peak point to the horizontal axis, and the points where the load-displacement diagram intersects the horizontal axis excluding the origin, is taken as the load work.

[0078] like Figure 3 As shown, the area enclosed by OABCD represents the plastic work W of the asphalt concrete before cracking. d The area enclosed by CDE represents the elastic work W of the asphalt concrete before cracking. e The area enclosed by CEF represents the load work W after the peak. p The plastic work W before cracking of asphalt concrete is obtained through mathematical integration. d Elastic work W e and load work W p .

[0079] This embodiment considers different types of energy in the semi-circular bending test of asphalt concrete. It not only uses characteristic points in the load-displacement diagram to analyze the characteristics of asphalt concrete, making the analysis more accurate, but also enables the analysis of different types of energy in asphalt concrete.

[0080] According to the above embodiments Figure 3 Calculate W before cracking of asphalt concrete using load-displacement diagram. d Elastic work W e The load power W after the peak pBased on the above embodiments, as a preferred embodiment, the plastic dissipation energy, elastic strain energy, and peak dissipation energy are determined according to plastic work, elastic work, and load work as follows:

[0081] Obtain the area of ​​the uncracked crack zone in asphalt concrete;

[0082] The ratio of plastic work to the area of ​​the uncracked crack zone is taken as plastic dissipation energy.

[0083] The elastic strain energy is obtained by dividing the elastic work by the area of ​​the unopened crack zone.

[0084] The ratio of the load work to the area of ​​the uncracked crack zone is used as the dissipated energy.

[0085] In practical applications, the area represented by OABCD indicates the plastic work (W) of asphalt concrete before cracking. d The area of ​​CDE represents the elastic work W of asphalt concrete before cracking. e The area of ​​CEF represents the load work W after the peak. p Subsequently, through the W before the asphalt concrete cracked... d Elastic work W e The load power W after the peak p Calculate the plastic dissipation energy U of asphalt concrete before cracking. d Elastic strain energy U before cracking e and the dissipation energy U after the peak p .

[0086] Furthermore, the elastic strain energy U before cracking of asphalt concrete was calculated. e There are two calculation methods. As a preferred embodiment, the elastic strain energy U e This is calculated by dividing the square of the work done by the product of twice the unloading stiffness and the area of ​​the uncracked crack zone. This necessitates obtaining the unloading stiffness before determining the brittleness index using the plastic dissipation energy, elastic strain energy, and peak post-dissipation energy of asphalt concrete.

[0087] The calculation formula is as follows:

[0088] ;

[0089] ;

[0090] ;

[0091] Among them, A lig E represents the area of ​​the un-cracked crack zone. u The unloading stiffness is equal to the slope of line segment AB.

[0092] This embodiment examines the W-shaped structure before asphalt concrete cracks. d Elastic work W e The load power W after the peak p Calculate the plastic dissipation energy U of asphalt concrete before cracking. d Elastic strain energy U before cracking e and the dissipation energy U after the peak p It can dissipate plastic energy U d Elastic strain energy U before cracking e and the dissipation energy U after the peak p The properties of asphalt concrete are evaluated from three perspectives.

[0093] Furthermore, the brittleness index is determined by the plastic dissipation energy, elastic strain energy, and post-peak dissipation energy of asphalt concrete, including:

[0094] Obtain the product of the sum of the plastic dissipation energy and the dissipation energy after the peak and the deformation value;

[0095] The product of elastic strain energy and brittleness index is used as the value of the product.

[0096] In practice, the brittleness index (BI) of the specimen can be calculated using the following formula:

[0097] ;

[0098] Where BI is the fragility index, d p This represents the deformation value corresponding to the peak load point.

[0099] This embodiment proposes a method for calculating the brittleness index BI, which can assess the fracture brittleness of asphalt concrete and take into account different types of energy, enabling comparisons of the same material at different temperatures or different materials at the same temperature.

[0100] The above embodiments provide a detailed description of the method for detecting the brittleness of asphalt concrete. Based on the above embodiments, this embodiment provides a calculation example, specifically:

[0101] Figure 4 This is a graph showing the aggregate gradation of an asphalt mixture according to another embodiment of this application; as shown below. Figure 4 As shown, asphalt mixtures containing 0%, 25%, 50%, 75%, 100% RAP and 100% RAP with a recycling agent were prepared, with the asphalt content being 6.2%. The new asphalt was SBS modified asphalt. The recycling agent content was 1.5% of the recycled asphalt. The aggregates were limestone or basalt.

[0102] The asphalt mixture obtained was pretreated for testing. The loose asphalt mixture was prepared into cylindrical specimens with a height of 120 mm and a diameter of 150 mm using a rotary compactor. These cylindrical specimens were then cut into semi-circular specimens with a thickness of 25 mm and a diameter of 150 mm. A pre-cut slit was made in the specimen, a vertical slit with a width of 1.5 mm and a depth of 20 mm, at the center of the bottom of the specimen. Furthermore, before the semi-circular bending test, the specimens were insulated at -10℃, 0℃, and 25℃ for 4 hours each. After the insulation period, the semi-circular bending test was conducted. Figure 5 A semi-circular bending test diagram provided for another embodiment of this application; as shown Figure 5 As shown, the distance from the cut position to the two support points is 40 mm, the loading rate is set to 5 mm / min, and the UTM can automatically store force and deformation information during the loading process.

[0103] Load-displacement diagrams and the plastic dissipation energy U of asphalt concrete were obtained through a semi-circular bending test. d Elastic strain energy U before cracking e and the dissipation energy U after the peak p And through plastic dissipation energy U d Elastic strain energy U before cracking e and the dissipation energy U after the peak p Calculate the fragility index BI. Figure 6 The brittleness index of asphalt mixture at -10°C is provided in another embodiment of this application; Figure 7 The brittleness index of asphalt mixture at 0°C is provided in another embodiment of this application; Figure 8 The brittleness index of asphalt mixture at 25°C is provided in another embodiment of this application; such as Figure 6 , Figure 7 , Figure 8 As shown, the Brittleness Index (BI) decreases significantly for the same type of mixture when the temperature rises from -10℃ to 25℃. This is due to the viscoelasticity of the asphalt binder, meaning the failure mode gradually shifts from brittle failure to ductile failure. The overall trend shows that the Brittleness Index (BI) increases with increasing RAP content, indicating that adding RAP makes the mixture more brittle. Furthermore, compared to mixtures with 100% RAP, the addition of recycling agent significantly reduces the BI values ​​at -10℃, 0℃, and 25℃, by 19.6%, 24.9%, and 43.3%, respectively. This result is attributed to the fact that recycling agent can soften aged asphalt, thus worsening the fracture brittleness of asphalt concrete.

[0104] The above embodiments have described in detail the method for detecting the brittleness of asphalt concrete. This application also provides embodiments of a device for detecting the brittleness of asphalt concrete. It should be noted that this application describes the embodiments of the device from two perspectives: one based on functional modules and the other based on hardware.

[0105] From the perspective of functional modules Figure 9 This is a structural diagram of a device for detecting the brittleness of asphalt concrete according to another embodiment of this application; as shown. Figure 9 As shown, the device includes:

[0106] Module 10 is used to acquire the load-displacement diagram of asphalt concrete after a semi-circular bending test.

[0107] The first determining module 11 is used to determine the plastic work before cracking of asphalt concrete, the elastic work before cracking of asphalt concrete, and the load work after reaching the peak value based on the load-displacement diagram.

[0108] The second determining module 12 is used to determine the plastic dissipated energy, elastic strain energy and peak dissipated energy based on plastic work, elastic work and load work.

[0109] The third determining module 13 is used to determine the brittleness index by the plastic dissipation energy, elastic strain energy and peak dissipation energy of asphalt concrete.

[0110] Since the embodiments of the apparatus and the embodiments of the method correspond to each other, please refer to the description of the embodiments of the method for the embodiments of the apparatus, which will not be repeated here.

[0111] The device for testing the brittleness of asphalt concrete provided in this application first acquires a load-displacement diagram of the asphalt concrete by performing a semi-circular bending test on the asphalt concrete using module 10. Then, first determining module 11, second determining module 12, and third determining module 13 calculate the plastic work, elastic work, and load work after the peak value of the asphalt concrete before cracking based on the load-displacement diagram. Next, the plastic dissipation energy, elastic strain energy, and post-peak dissipation energy are determined based on the plastic work, elastic work, and load work. Finally, the brittleness index is calculated using the plastic dissipation energy, elastic strain energy, and post-peak dissipation energy of the asphalt concrete. The brittleness index allows for the consideration of different types of energy in the semi-circular bending test and enables comparison of the fracture brittleness of the same type of asphalt concrete at different temperatures or different types of asphalt concrete at the same temperature. A higher brittleness index indicates greater fracture brittleness of the asphalt concrete.

[0112] Figure 10 A structural diagram of a testing device for the brittleness of asphalt concrete provided in another embodiment of this application; as shown Figure 10As shown, the device for testing the brittleness of asphalt concrete includes: a memory 20 for storing computer programs;

[0113] The processor 21 is used to execute a computer program to implement the steps of the method for detecting the brittleness of asphalt concrete as described in the above embodiments.

[0114] The testing equipment for the brittleness of asphalt concrete provided in this embodiment may include, but is not limited to, smartphones, tablets, laptops, or desktop computers.

[0115] The processor 21 may include one or more processing cores, such as a quad-core processor or an octa-core processor. The processor 21 may be implemented using at least one of the following hardware forms: Digital Signal Processor (DSP), Field-Programmable Gate Array (FPGA), or Programmable Logic Array (PLA). The processor 21 may also include a main processor and a coprocessor. The main processor, also known as the Central Processing Unit (CPU), is used to process data in the wake-up state; the coprocessor is a low-power processor used to process data in the standby state. In some embodiments, the processor 21 may integrate a Graphics Processing Unit (GPU), which is responsible for rendering and drawing the content to be displayed on the screen. In some embodiments, the processor 21 may also include an Artificial Intelligence (AI) processor, which is used to handle computational operations related to machine learning.

[0116] The memory 20 may include one or more computer-readable storage media, which may be non-transitory. The memory 20 may also include high-speed random access memory and non-volatile memory, such as one or more disk storage devices or flash memory devices. In this embodiment, the memory 20 is used to store at least the following computer program 201, which, after being loaded and executed by the processor 21, is capable of implementing the relevant steps of the asphalt concrete brittleness detection method disclosed in any of the foregoing embodiments. In addition, the resources stored in the memory 20 may also include an operating system 202 and data 203, and the storage method may be temporary or permanent storage. The operating system 202 may include Windows, Unix, Linux, etc. The data 203 may include, but is not limited to, data related to the asphalt concrete brittleness detection method.

[0117] In some embodiments, the asphalt concrete brittleness testing device may further include a display screen 22, an input / output interface 23, a communication interface 24, a power supply 25, and a communication bus 26.

[0118] Those skilled in the art will understand that Figure 10 The structure shown does not constitute a limitation on the testing equipment for the brittleness of asphalt concrete and may include more or fewer components than shown.

[0119] The asphalt concrete brittleness testing device provided in this application includes a memory and a processor. When the processor executes the program stored in the memory, it can implement the following method:

[0120] First, a semi-circular bending test was conducted on the asphalt concrete to obtain a load-displacement diagram. Based on this diagram, the plastic work before cracking, the elastic work before cracking, and the load work after reaching the peak value were calculated. Then, the plastic dissipation energy, elastic strain energy, and post-peak dissipation energy were determined using these parameters. Finally, the brittleness index was calculated using these parameters. The brittleness index allows for the consideration of different types of energy in the semi-circular bending test and enables comparisons of the fracture brittleness of the same type of asphalt concrete at different temperatures or different types of asphalt concrete at the same temperature. A higher brittleness index indicates greater fracture brittleness of the asphalt concrete.

[0121] Finally, this application also provides an embodiment corresponding to a computer-readable storage medium. The computer-readable storage medium stores a computer program, which, when executed by a processor, implements the steps described in the above method embodiments.

[0122] It is understood that if the methods in the above embodiments are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and executes all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0123] The foregoing provides a detailed description of a method, apparatus, equipment, and medium for testing the brittleness of asphalt concrete. The various embodiments in the specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since it corresponds to the method disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to in the method section. It should be noted that those skilled in the art can make several improvements and modifications to this application without departing from the principles of this application, and these improvements and modifications also fall within the protection scope of the claims of this application.

[0124] It should also be noted that, in this specification, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

Claims

1. A method for testing the brittleness of asphalt concrete, characterized in that, include: Obtain the load-displacement diagram of asphalt concrete after a semi-circular bending test; The plastic work, elastic work, and load work after reaching the peak value of the asphalt concrete before cracking are determined based on the load-displacement diagram. The plastic dissipation energy, elastic strain energy, and peak dissipation energy are determined based on the plastic work, the elastic work, and the load work. The brittleness index is determined by the plastic dissipation energy, elastic strain energy, and post-peak dissipation energy of the asphalt concrete. The higher the brittleness index, the greater the fracture brittleness of asphalt concrete; After obtaining the load-displacement diagram of the asphalt concrete after the semi-circular bending test, the method further includes: Determine the peak point and peak load in the load-displacement diagram; Select the peak load of the preset interval; Draw a straight line intersecting the horizontal axis at a point based on the slope of the peak point and the preset interval; A perpendicular line drawn from the peak point to the horizontal axis intersects the horizontal axis at another point. The determination of the plastic work before cracking of the asphalt concrete, the elastic work before cracking of the asphalt concrete, and the load work after reaching the peak value based on the load-displacement diagram includes: The area enclosed by a straight line drawn from the origin of the load-displacement diagram, the peak point, the slope of the peak point, and the preset interval segment, intersecting the horizontal axis, is taken as the plastic work. The area enclosed by the point where a straight line drawn from the peak point, the slope of the peak point, and the preset interval intersects a point on the horizontal axis, and a perpendicular line drawn from the peak point to the horizontal axis, is taken as the elastic work. The area enclosed by the peak point, the intersection point of the perpendicular line drawn from the peak point to the horizontal axis, and the points where the load-displacement diagram intersects the horizontal axis excluding the origin, is taken as the load work. Before determining the brittleness index using the plastic dissipation energy, elastic strain energy, and post-peak dissipation energy of the asphalt concrete, the method further includes: Obtain the deformation value and unloading stiffness corresponding to the peak load point; The determination of the brittleness index using the plastic dissipation energy, elastic strain energy, and post-peak dissipation energy of the asphalt concrete includes: Obtain the product of the sum of the plastic dissipation energy and the dissipation energy after the peak value and the deformation value; The value of dividing the elastic strain energy by the product is used as the brittleness index; The formula for calculating the brittleness index is: ； in, BI The brittleness index, d p This represents the deformation value corresponding to the peak load point. U d For plastic dissipation energy before asphalt concrete cracks, U e This refers to the elastic strain energy of asphalt concrete before cracking. U p This represents the peak post-dissipation energy of asphalt concrete.

2. The method for detecting the brittleness of asphalt concrete according to claim 1, characterized in that, The determination of plastic dissipation energy, elastic strain energy, and peak dissipation energy based on the plastic work, elastic work, and load work includes: Obtain the area of ​​the uncracked crack zone in the asphalt concrete; The ratio of the plastic work to the area of ​​the uncracked crack zone is taken as the plastic dissipation energy. The elastic strain energy is obtained by dividing the elastic work by the area of ​​the uncracked crack zone. The ratio of the load work to the area of ​​the uncracked crack zone is taken as the dissipated energy.

3. The method for detecting the brittleness of asphalt concrete according to claim 2, characterized in that, The elastic strain energy is the square of the corresponding work divided by twice the unloading stiffness and the area of ​​the uncracked crack zone.

4. A device for testing the brittleness of asphalt concrete, characterized in that, include: The acquisition module is used to obtain the load-displacement diagram of asphalt concrete after a semi-circular bending test. The first determining module is used to determine the plastic work of the asphalt concrete before cracking, the elastic work of the asphalt concrete before cracking, and the load work after reaching the peak value based on the load-displacement diagram. The second determining module is used to determine the plastic dissipated energy, elastic strain energy, and peak dissipated energy based on the plastic work, the elastic work, and the load work. The third determining module is used to determine the brittleness index by the plastic dissipation energy, elastic strain energy and peak dissipation energy of the asphalt concrete; the larger the brittleness index, the greater the fracture brittleness of the asphalt concrete. The asphalt concrete brittleness testing device is also used to determine the peak point and peak load in the load-displacement diagram obtained after the asphalt concrete undergoes a semi-circular bending test. Select the peak load of the preset interval; Draw a straight line intersecting the horizontal axis at a point based on the slope of the peak point and the preset interval; A perpendicular line drawn from the peak point to the horizontal axis intersects the horizontal axis at another point. The first determining module is specifically used to take the area enclosed by a point on the horizontal axis formed by drawing a straight line from the origin of the load-displacement diagram, the peak point, the slope of the peak point and the preset interval segment as the plastic work. The area enclosed by the point where a straight line drawn from the peak point, the slope of the peak point, and the preset interval intersects a point on the horizontal axis, and a perpendicular line drawn from the peak point to the horizontal axis, is taken as the elastic work. The area enclosed by the peak point, the intersection point of the perpendicular line drawn from the peak point to the horizontal axis, and the points where the load-displacement diagram intersects the horizontal axis excluding the origin, is taken as the load work. The asphalt concrete brittleness testing device is also used to obtain the deformation value and unloading stiffness corresponding to the peak load point before determining the brittleness index through the plastic dissipation energy, elastic strain energy and peak dissipation energy of the asphalt concrete. The third determining module is specifically used to obtain the product of the sum of the plastic dissipation energy and the peak dissipation energy and the deformation value; The value of dividing the elastic strain energy by the product is used as the brittleness index; The formula for calculating the brittleness index is: ； in, BI The brittleness index, d p This represents the deformation value corresponding to the peak load point. U d For plastic dissipation energy before asphalt concrete cracks, U e This refers to the elastic strain energy of asphalt concrete before cracking. U p This represents the peak post-dissipation energy of asphalt concrete.

5. A testing device for the brittleness of asphalt concrete, characterized in that, Includes memory used to store computer programs; A processor, configured to execute the computer program to implement the steps of the method for detecting the brittleness of asphalt concrete as described in any one of claims 1 to 3.

6. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program that, when executed by a processor, implements the steps of the method for detecting the brittleness of asphalt concrete as described in any one of claims 1 to 3.

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