Evaluation test method and equipment for asphalt mixture and interlayer adhesion performance
Through the evaluation and testing equipment and methods of designing controllable reserved cross-sections and debonding areas between asphalt mixture layers, the problem of early separation of the pulling fixture and the asphalt mixture surface is solved, and accurate evaluation and efficient detection of the adhesion performance between asphalt mixture layers is achieved.
Patent Information
- Application Number
- CN202510674181.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-23
- Publication Date
- 2025-08-08
AI Technical Summary
The prior art cannot accurately evaluate the adhesion performance between asphalt mixture layers, especially in the problem of early separation of the pulling fixture and the asphalt mixture surface, and cannot truly reflect the adhesion damage behavior under the road surface state, and the evaluation results are insufficient in accuracy and reliability.
Design the evaluation and testing equipment and methods for controlling reserved cross-sections. By setting the controllable reserved cross-section on the upper and lower gaskets and applying lubricating oil, the adhesion between layers is reduced, and the adhesion failure state is simulated between road layers due to moisture penetration and temperature changes. The pulling test is carried out with the help of Marshall molds and hydraulic servo devices.
It effectively reduces the problem of insufficient adhesion between the pulling fixture and the asphalt mixture surface, improves the accuracy and reliability of the evaluation results, reduces experimental costs, simplifies the operation process, and is suitable for large-scale engineering practices.
Smart Images
Figure CN120445975A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of pavement material testing, and in particular to a test method and equipment for evaluating the adhesion performance of asphalt mixtures and interlayers. Background Art
[0002] In road construction, the adhesion performance of asphalt mixtures or between layers is crucial to the overall quality and durability of the pavement. To ensure good adhesion between pavement layers, it is necessary to accurately evaluate the interlayer adhesion performance of asphalt mixtures.
[0003] However, most traditional methods for evaluating the adhesion performance of asphalt mixtures and interlayers focus solely on the asphalt-aggregate adhesion characteristics, failing to reveal the overall adhesion failure behavior of asphalt mixture specimens. While some studies have proposed using conventional pullout tests for overall asphalt mixture evaluation, insufficient adhesion between the upper surface of the asphalt mixture and the pullout fixture, leading to premature separation of the fixture from the asphalt mixture surface, has become a technical bottleneck limiting accurate evaluation. Other methods focus on the asphalt-aggregate adhesion characteristics of loose asphalt mixture particles. However, asphalt mixtures in real-world pavement conditions are not in a loose particle state, and therefore cannot truly reflect the pullout adhesion interface failure behavior of the overall asphalt mixture specimen. The accuracy and reliability of the evaluation results still need to be improved. Furthermore, these methods require complex and high-precision testing equipment, are cumbersome to operate, and are not conducive to on-site testing and cannot be widely applied in engineering practice.
[0004] Furthermore, factors such as moisture penetration and temperature changes can cause certain interfacial adhesion failures between layers of existing long-term service roads. This adhesion failure can have a significant adverse effect on the overall structure and stress of the road. However, there is currently no test method that can accurately evaluate this phenomenon. Existing technology cannot accurately analyze the true failure morphology of asphalt mixture specimens as a whole, and has limitations in evaluating the macroscopic adhesion performance between layers. Summary of the Invention
[0005] The purpose of this application is to provide an evaluation test method and equipment for asphalt mixture and interlayer adhesion performance, so as to solve the technical bottleneck problem that the existing pulling clamp will separate from the asphalt mixture surface prematurely and the technical problem that the evaluation accuracy and reliability need to be improved.
[0006] In a first aspect, the present application provides an asphalt mixture and interlayer adhesion performance evaluation test equipment, comprising: a Marshall mold; and
[0007] An asphalt mixture specimen, comprising a lower layer asphalt mixture and an upper layer asphalt mixture located at the lower and upper portions of the Marshall mold, respectively, and a lower gasket laid on the upper surface of the lower layer asphalt mixture, and an upper gasket laid on the lower surface of the upper layer asphalt mixture, wherein the upper gasket and the lower gasket are both provided with controllable reserved cross-sections with upper and lower through-openings at the same position, and portions of the upper gasket and the lower gasket excluding the controllable reserved cross-sections are debonding areas, lubricating oil is filled between the upper surface of the debonding area of the lower gasket and the lower surface of the debonding area of the upper gasket, and the upper gasket and the lower gasket are aligned and placed in contact with each other; and
[0008] A pulling fixture and a hydraulic servo device are provided for performing a pulling test on the asphalt mixture specimen.
[0009] In a second aspect, the present application provides a method for evaluating the adhesion performance of asphalt mixtures and interlayers, based on the aforementioned equipment for evaluating the adhesion performance of asphalt mixtures and interlayers. The method includes:
[0010] Step 100: Prepare the raw materials required for preparing the asphalt mixture specimen, including asphalt mixture, upper gasket, lower gasket and lubricating oil. The upper gasket and the lower gasket have the same shape and structure, and the upper gasket and the lower gasket have a controllable reserved section with upper and lower through holes at the same position. The area of the controllable reserved section is Area. 预留截面 ;
[0011] Step 200: Prepare an asphalt mixture specimen by stacking the lower layer asphalt mixture, lower gasket, lubricating oil, upper gasket and upper layer asphalt mixture into a Marshall mold from bottom to top, and record the mass of the upper layer asphalt mixture, which is recorded as m. 上层位 ;
[0012] Step 300, performing Marshall compaction treatment on the asphalt mixture specimen;
[0013] Step 400: Perform a pull-out test on the asphalt mixture specimen and record the maximum pull-out force when the asphalt mixture specimen fractures at the interface, which is recorded as F. max ;
[0014] Step 500: Based on the obtained data, the adhesion strength of the asphalt mixture and its layers is obtained, which is denoted as f 黏 , and obtain the evaluation results of asphalt mixture and interlayer adhesion performance.
[0015] Furthermore, in step 500, the adhesion strength of the asphalt mixture and its interlayers is calculated based on the obtained data and combined with the adhesion calculation formula, which is denoted as f 黏 ;
[0016] The adhesion calculation formula is:
[0017]
[0018] Among them, f 黏 Represents the adhesion strength of asphalt mixture and its layers, in MPa, F max Represents the maximum pull-out force when the asphalt mixture specimen breaks at the interface, in N, m 上层位 Represents the mass of the upper layer asphalt mixture, in kg, Area 预留截面 Represents the area of the controllable reserved section opened by the upper gasket and the lower gasket, in mm 2 .
[0019] Furthermore, in step 200, the process of preparing the asphalt mixture specimen is as follows: the lower layer asphalt mixture is fully mixed and poured into the lower part of the Marshall mold, and the upper surface of the lower layer asphalt mixture is leveled, and then the lower gasket is flatly spread and placed on the upper surface of the lower layer asphalt mixture, and lubricating oil is applied on the upper surface of the lower gasket, and then the upper gasket is stacked and aligned on the upper surface of the lower gasket coated with the lubricating oil, and then the upper layer asphalt mixture is fully mixed and poured into the Marshall mold and pressed on the upper surface of the upper gasket.
[0020] Furthermore, in step 400, the process of performing a pull-out test on the asphalt mixture specimen is as follows: first, the asphalt mixture specimen is cooled and demolded, then the upper and lower surfaces of the asphalt mixture specimen are bonded to a pull-out fixture, and then the asphalt mixture specimen is placed in a hydraulic servo device for a pull-out test.
[0021] Furthermore, epoxy resin curing glue is evenly applied to the upper and lower surfaces of the asphalt mixture specimen and the contact portion with the pulling fixture, and is left to stand for at least 12 hours before being placed in the hydraulic servo device for a pulling test.
[0022] Furthermore, in step 100, the controllable reserved cross section is opened at the center position of the upper gasket and the lower gasket, and the shape of the controllable reserved cross section is a regular shape such as a circle or a square or an irregular shape; and / or
[0023] A plurality of controllable reserved sections are provided at a plurality of positions on the upper gasket and the lower gasket.
[0024] Furthermore, two identical annular gaskets are cut to serve as the upper gasket and the lower gasket respectively; and / or
[0025] The upper layer asphalt mixture and the lower layer asphalt mixture are asphalt mixtures of the same type or asphalt mixtures of different types.
[0026] Furthermore, the accuracy was verified at service temperatures of -10°C, 20°C, and 40°C;
[0027] It was found that when the service temperature was 40°C, the pull-out strength was 0.4 MPa, when the service temperature was 15°C, the pull-out strength was 1.3 MPa, and when the service temperature was -10°C, the pull-out strength was 5.1 MPa.
[0028] Furthermore, the accuracy was verified under the controllable reserved cross-section area corresponding to the interlayer adhesion failure area accounting for 91.3%, 84.5% and 75.8%, respectively, and the upper layer asphalt mixture and the lower layer asphalt mixture adopted AC-13 type gradation and AC-16 type gradation, respectively;
[0029] It was found that when the interlayer adhesion failure area accounted for 91.3%, the pull-out force value was 0.17 MPa, when the interlayer adhesion failure area accounted for 84.5%, the pull-out force value was 0.23 MPa, and when the interlayer adhesion failure area accounted for 75.8%, the pull-out force value was 0.25 MPa.
[0030] Compared with the prior art, the asphalt mixture and interlayer adhesion performance evaluation test method and equipment provided in this application propose a way to design a controllable reserved section, that is, to design a controllable debonding area between the layers of the asphalt mixture, specifically by stacking an upper gasket and a lower gasket with a controllable reserved section with upper and lower through openings between the layers of the asphalt mixture, and performing a debonding treatment on the parts of the upper gasket and the lower gasket except for the controllable reserved section, that is, filling with lubricating oil for debonding, so that only the parts of the upper asphalt mixture and the lower asphalt mixture corresponding to the controllable reserved section are in contact and bonded with each other, and only the part with the controllable reserved section is the subsequent controllable pulling area. After the asphalt mixture specimen is designed, Marshall compaction treatment and pull-out test are carried out on this basis, and then the adhesion strength of the asphalt mixture and its layers is obtained based on the obtained test data, and then the evaluation results are obtained.
[0031] Such a setting, on the one hand, designs a controllable reserved cross-section and a controllable debonding area, reduces the interlayer adhesion part, can effectively reduce the interlayer adhesion of the asphalt mixture, and effectively reduces the controllable pulling area, thereby greatly reducing the requirements for the bonding strength between the pulling fixture and the upper and lower surfaces of the asphalt mixture, and will not cause the pulling fixture and the upper and lower surfaces of the asphalt mixture to separate prematurely due to insufficient bonding strength, thus solving the technical bottleneck. Of course, you can also choose a viscous glue with greater adhesion (such as epoxy resin curing glue) at the same time to improve the bonding strength between the pulling fixture and the upper and lower surfaces of the asphalt mixture; On the other hand, the design of controllable reserved sections and controllable debonding areas takes into account and simulates the adhesion failure state between road layers caused by factors such as moisture penetration and temperature changes, which is more in line with the actual state between road layers and improves the accuracy and reliability of the evaluation results; on the other hand, this application uses conventional laboratory test equipment to achieve quantitative detection of the actual adhesion behavior of asphalt mixtures and layers. The experimental cost is low, the test method is simple to operate, and the test efficiency is improved. It is suitable for rapid evaluation of interlayer adhesion performance in various occasions and is conducive to widespread use in large-scale engineering practice. BRIEF DESCRIPTION OF THE DRAWINGS
[0032] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the specific implementation methods or the description of the prior art. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.
[0033] Figure 1 A schematic diagram of the structure of the asphalt mixture specimen provided in the embodiment of the present application formed in a Marshall mold;
[0034] Figure 2 for Figure 1 A magnified view of the structure of part A;
[0035] Figure 3 A schematic diagram of the pull-out test process provided in an embodiment of the present application;
[0036] Figure 4 A schematic diagram showing the ratio of debonding areas between asphalt pavement layers provided in an embodiment of the present application;
[0037] Figure 5 This is a gradation curve diagram of AC-13 asphalt mixture provided in the embodiment of the present application;
[0038] Figure 6 A bar chart showing the pull-out adhesion of the AC-13 asphalt mixture at different service temperatures provided in the examples of this application;
[0039] Figure 7This is a gradation curve diagram of AC-16 asphalt mixture provided in the embodiment of the present application;
[0040] Figure 8 A bar chart of the pull-out adhesion between asphalt mixture layers under different adhesion failure conditions provided in the embodiments of the present application.
[0041] Reference numerals:
[0042] 10-Asphalt mixture specimen;
[0043] 11-lower layer asphalt mixture;
[0044] 12-upper layer asphalt mixture;
[0045] 13-lower gasket;
[0046] 14-upper gasket;
[0047] 15-Controllable reserved section;
[0048] 16-debonding area;
[0049] 17- Lubricating oil;
[0050] 20-Marshall die;
[0051] 30-Pulling fixture;
[0052] 31-epoxy resin curing adhesive;
[0053] 41-debonding area between pavement layers;
[0054] 42-Asphalt road surface. DETAILED DESCRIPTION
[0055] To make the objectives, technical solutions, and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Generally, the components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.
[0056] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for protection, but merely represents selected embodiments of the present application. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments in the present application without creative work are within the scope of protection of the present application.
[0057] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.
[0058] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the product of this application is typically placed when in use. These terms are intended only to facilitate the description of this application and simplify the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.
[0059] Furthermore, terms such as "horizontal," "vertical," and "overhanging" do not necessarily imply that a component must be absolutely horizontal or overhanging, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but rather that it can be slightly tilted.
[0060] It should also be noted that, in the description of this application, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.
[0061] The following describes some embodiments of the present application in detail with reference to the accompanying drawings. In the absence of conflict, the following embodiments and features therein may be combined with each other.
[0062] like Figures 1 to 3 As shown, embodiments of the present application provide a test apparatus and method for evaluating the adhesion performance of asphalt mixtures and interlayers. The test apparatus may include a Marshall mold 20, an asphalt mixture specimen 10 positioned within the Marshall mold 20, a pulling fixture for performing a pull-out test on the asphalt mixture specimen 10, and a hydraulic servo device, the hydraulic servo device being a hydraulic servo instrument.
[0063] In particular, the asphalt mixture specimen 10 includes a lower layer asphalt mixture 11 and an upper layer asphalt mixture 12 located at the lower and upper parts of the Marshall mold 20 respectively, and a lower gasket 13 laid on the upper surface of the lower layer asphalt mixture 11, and an upper gasket 14 laid on the lower surface of the upper layer asphalt mixture 12, and the upper gasket 14 and the lower gasket 13 have the same shape and structure, and both have a controllable reserved section 15 with upper and lower through openings at the same position, and the parts of the upper gasket 14 and the lower gasket 13 except the controllable reserved section 15 are debonding areas 16, and lubricating oil 17 is filled between the upper surface of the debonding area 16 of the lower gasket 13 and the lower surface of the debonding area 16 of the upper gasket 14, and the upper gasket 14 and the lower gasket 13 are aligned and contacted with each other in the upper and lower directions, and the controllable reserved sections 15 of the two are aligned in the upper and lower directions, and the debonding areas 16 are aligned in the upper and lower directions.
[0064] The asphalt mixture and interlayer adhesion performance evaluation test method provided in the embodiments of the present application is based on the aforementioned asphalt mixture and interlayer adhesion performance evaluation test equipment. The evaluation test method may include:
[0065] Step 100, prepare the raw materials required for preparing the asphalt mixture specimen 10, including asphalt mixture, upper gasket 14, lower gasket 13 and lubricating oil 17. The upper gasket 14 and the lower gasket 13 have the same shape and structure, and the upper gasket 14 and the lower gasket 13 have a controllable reserved section 15 with a through hole at the same position. The area of the controllable reserved section 15 is Area 预留截面 This design helps to control variables more accurately in subsequent experiments, thereby ensuring the validity of the experimental data.
[0066] Specifically, a circular or square regular-shaped controllable reserved section 15 can be provided at the center position of the upper gasket 14 and the lower gasket 13. The regular shape facilitates the calculation of the area data of the controllable reserved section 15, which is beneficial to the calculation of the evaluation results. A controllable reserved section 15 is provided at the center position to facilitate the test operation. Multiple controllable reserved sections 15 can also be provided at multiple positions on the upper gasket 14 and the lower gasket 13. Of course, the controllable reserved section 15 can also be cut into irregular shapes, such as Figure 4 As shown, there are multiple controllable reserved sections 15 and the controllable reserved sections 15 with irregular shapes are more in line with the actual debonding state between road layers. Figure 4 The white portion is the debonding area 41 between the pavement layers, and the black asphalt-like pattern portion is the asphalt pavement 42.
[0067] Step 200: Prepare an asphalt mixture specimen 10, and stack the lower layer asphalt mixture 11, lower gasket 13, lubricating oil 17, upper gasket 14, and upper layer asphalt mixture 12 in order from bottom to top into a Marshall mold 20, and record the mass of the upper layer asphalt mixture 12, which is recorded as m.上层位 ;
[0068] Among them, preferably, Figure 1 As shown, the specific process of preparing the asphalt mixture specimen 10 can be as follows: after fully mixing the lower layer asphalt mixture 11, pour it into the lower part of the Marshall mold 20, and level the upper surface of the lower layer asphalt mixture 11 to ensure that the upper surface of the lower layer asphalt mixture 11 is level, then lay the lower gasket 13 flatly and cover it on the upper surface of the lower layer asphalt mixture 11, and apply lubricating oil 17 on the upper surface of the lower gasket 13, then stack and align the upper gasket 14 on the upper surface of the lower gasket 13 coated with lubricating oil 17, then fully mix the upper layer asphalt mixture 12 and pour it into the Marshall mold 20, and press it on the upper surface of the upper gasket 14 to obtain the asphalt mixture specimen 10.
[0069] In step 300, the asphalt mixture specimen 10 is subjected to Marshall compaction treatment to ensure that the asphalt mixture meets the compaction requirements of the specification; the asphalt mixture specimen 10 after compaction treatment is more consistent with the actual asphalt pavement state than the asphalt mixture in a loose particle state, and the test evaluation result is more accurate.
[0070] Step 400: Perform a pull-out test on the asphalt mixture specimen 10 and record the maximum pull-out force when the asphalt mixture specimen 10 breaks at the interface, which is recorded as F. max ;
[0071] Among them, preferably, Figure 2 As shown, the specific process of performing a pull-out test on the asphalt mixture specimen 10 may be as follows: first, the asphalt mixture specimen 10 is cooled and demolded. This process requires careful operation to prevent the asphalt mixture specimen 10 from being damaged unnecessarily. Then, the upper and lower surfaces of the asphalt mixture specimen 10 are bonded to the pull-out fixture 30. Specifically, epoxy resin curing adhesive 31 may be evenly applied to the upper and lower surfaces of the asphalt mixture specimen 10 and the contact parts with the pull-out fixture 30. After standing for at least 12 hours, the asphalt mixture specimen 10 is placed in a hydraulic servo device for a pull-out test. This can provide direct bonding between the pull-out fixture 30 and the upper and lower surfaces of the asphalt mixture specimen 10, further ensuring that there will be no premature separation.
[0072] Step 500: Based on the above data and in combination with the adhesion calculation formula, the adhesion strength of the asphalt mixture and its layers is calculated, which is denoted as f 黏 .
[0073] Compared with the prior art, the asphalt mixture and interlayer adhesion performance evaluation test method and equipment provided in the embodiment of the present application propose a way to design a controllable reserved section 15, that is, to design a controllable debonding area 16 between the layers of the asphalt mixture, specifically by stacking an upper gasket 14 and a lower gasket 13 with a controllable reserved section 15 with upper and lower through openings between the layers of the asphalt mixture, and performing a debonding treatment on the parts of the upper gasket 14 and the lower gasket 13 except for the controllable reserved section 15, that is, filling with lubricating oil 17 for debonding, so that only the parts of the upper asphalt mixture 12 and the lower asphalt mixture 11 corresponding to the controllable reserved section 15 are in contact and bonded with each other, and only the part of the controllable reserved section 15 is the subsequent controllable pulling area. After the asphalt mixture specimen 10 is designed, Marshall compaction treatment and pull-out test are carried out on this basis, and then the adhesion strength of the asphalt mixture and its interlayers are obtained based on the obtained test data, and then the evaluation results are obtained.
[0074] With such a setting, on the one hand, the controllable reserved section 15 and the controllable debonding area 16 are designed to reduce the interlayer adhesion part, which can effectively reduce the interlayer adhesion of the asphalt mixture and effectively reduce the controllable pulling area. In this way, the requirements for the bonding force between the pulling clamp 30 and the upper and lower surfaces of the asphalt mixture are greatly reduced, and the pulling clamp 30 and the upper and lower surfaces of the asphalt mixture will not be separated prematurely due to insufficient bonding force, thus solving the technical bottleneck. Of course, a viscous glue with greater bonding force (such as epoxy resin curing glue 31) can also be selected at the same time to improve the bonding force between the pulling clamp 30 and the upper and lower surfaces of the asphalt mixture; on the other hand, the controllable The reserved section 15 and the controllable debonding area 16 take into account and simulate the adhesion failure state between road layers caused by factors such as moisture penetration and temperature changes, which is more in line with the actual state between road layers and improves the accuracy and reliability of the evaluation results; on the other hand, the embodiment of the present application uses conventional laboratory test equipment such as Marshall molds 20, pulling fixtures 30 and hydraulic servo instruments to achieve quantitative detection of the actual adhesion behavior of asphalt mixtures and layers. The experimental cost is low, the test method is simple to operate, and the test efficiency is improved. It is suitable for quickly evaluating the interlayer adhesion performance in various occasions and is conducive to widespread use in large-scale engineering practices.
[0075] Specifically, the aforementioned adhesion calculation formula is:
[0076]
[0077] Among them, f 黏 Represents the adhesion strength of asphalt mixture and its layers, in MPa, F max Represents the maximum pull-out force when the asphalt mixture specimen 10 undergoes interfacial fracture, in N, m 上层位 Represents the mass of the upper layer asphalt mixture 12, in kg, Area预留截面 Represents the area of the controllable reserved section 15 opened by the upper gasket 14 and the lower gasket 13, in mm 2 .
[0078] The above data obtained through the aforementioned test steps can more accurately control variables, and the evaluation results obtained in combination with the adhesion calculation formula are more accurate, further ensuring the validity and reliability of the evaluation test data.
[0079] Two specific embodiments are provided below.
[0080] Example 1
[0081] On the basis of the aforementioned technical solution of the present application, since the service temperature is a key factor in determining the adhesion performance of asphalt mixture, this embodiment further provides an evaluation test method for evaluating the interfacial adhesion performance of asphalt mixture at different service temperatures to further demonstrate the accuracy and reliability of this evaluation test method.
[0082] Specifically, taking AC-13 asphalt mixture as an example, 90# road petroleum asphalt is selected as the asphalt mixture. This embodiment conducts three groups of asphalt mixture interface adhesion performance test experiments at -10°C, 20°C and 40°C.
[0083] The specific implementation steps are as follows:
[0084] Step 1: This embodiment takes AC-13 asphalt mixture as an example. The gradation of the asphalt mixture is selected as shown in Table 1 and Figure 5 As shown, on this basis, the asphalt mixture mix ratio is designed, and the asphalt content to be added is 4.2% to ensure that the gradation of the selected asphalt mixture is within the standard gradation range; at the same time, two circular ring gaskets with an inner diameter of 40mm and an outer diameter of 101.6mm are cut as the upper gasket 14 and the lower gasket 13 respectively. The inner diameter of the circular gasket is within the circular range of the controllable reserved section 15, and the area of the controllable reserved section 15 is Area 预留截面 The area between the inner diameter circle and the outer diameter circle is the debonding area 16, and lubricating oil is evenly applied to the inside and outside of the annular gasket 17. Figure 5 It can be seen that the gradation of the selected asphalt mixture is within the standard gradation range and meets the requirements.
[0085] Table 1: Aggregate gradation of AC-13 asphalt mixture
[0086] Sieve hole (mm) 16.0 13.2 9.5 4.75 2.36 1.18 0.6 0.3 0.075 Pass rate (%) 100 95.4 79.9 49.2 39.0 27.1 17.7 11.1 8.50
[0087] Step 2: After mixing the AC-13 asphalt mixture, pour the lower layer of asphalt mixture 11 into the lower part of the Marshall mold 20 and tamp it to ensure the surface is flat; then place the lower gaskets 13 in sequence, apply a proper amount of lubricating oil 17 between the gaskets, and then place the upper gasket 14. After completing these preparations, continue to mix the upper layer of asphalt mixture 12 and pour it into the Marshall mold 20, and record the mass of the upper layer of asphalt mixture, which is recorded as m 上层位 The specific process here has been described in detail in the previous part of this article and will not be repeated here.
[0088] Step 3: Perform Marshall compaction on the asphalt mixture specimen 10 to ensure that the asphalt mixture meets the compaction requirements of the specification. Subsequently, the asphalt mixture specimen 10 is cooled and demolded, and then the volume parameters of the demolded asphalt mixture specimen are tested based on the "Test Procedure for Asphalt and Asphalt Mixtures in Highway Engineering JTG E20-2011" as shown in Table 2 below; then the upper and lower surfaces of the asphalt mixture specimen 10 are adhered to the pulling fixture 30, and it is placed in a hydraulic servo instrument for a pulling test, and the maximum pulling force value when the specimen interface breaks is recorded, which is recorded as F max As shown in Table 2 below, the volume parameters of the asphalt mixture specimen after demoulding of Example 1 meet the requirements of the above specifications.
[0089] Table 2: Volume parameters of AC-13 asphalt mixture used in Example 1
[0090]
[0091] Step 4: Based on the maximum pull-out force value when the specimen interface breaks at different service temperatures and the design reserved cross-sectional size data, combined with the adhesion calculation formula, the adhesion pull-out stress value of the asphalt mixture at different service temperatures can be calculated, such as Figure 6 As shown in the figure, when the service temperature is 40℃, the pull-out force is 0.4MPa. After the service temperature is reduced by 25℃, the pull-out force is 1.3MPa at the service temperature of 15℃. After the service temperature is further reduced by 25℃, the pull-out force is 5.1MPa at the service temperature of -10℃. The experimental results are consistent with the actual law.
[0092] Based on the test results of the above-mentioned embodiment 1, it can be proved that the test method for evaluating the adhesion performance of asphalt mixtures and interlayers proposed in the embodiment of the present application has good discrimination and sensitivity for the adhesion performance of asphalt mixtures at different service temperatures. The test results are in line with actual laws, further verifying the reliability, effectiveness and accuracy of the evaluation results of the test method for evaluating the adhesion performance of asphalt mixtures and interlayers provided by the present application. At the same time, the test method is simple and efficient, which is conducive to use in extensive large-scale engineering practices.
[0093] Example 2
[0094] This embodiment 2 provides another asphalt mixture and interlayer adhesion performance evaluation test method. The difference from the embodiment 1 is that this embodiment 2 simulates three groups of interlayer adhesion failure areas (i.e., the area of the controllable reserved section 15). 预留截面 ) accounted for 91.3%, 84.5% and 75.8% of the road layers respectively due to different adhesion failure states caused by factors such as moisture penetration and temperature changes, and a combination of AC-13 asphalt mixture and AC-16 asphalt mixture was used. The upper asphalt mixture 12 adopted AC-13 gradation, and the lower asphalt mixture 11 adopted AC-16 gradation, which is more in line with the gradation selection of the actual conventional three-dimensional asphalt road structure layer and has higher accuracy. In addition, Example 2 chose to conduct the test at the common temperature of 15°C.
[0095] The specific implementation steps are as follows:
[0096] Step 1, different from Example 1, is to simulate the conventional asphalt pavement structure layer, as shown in Table 1 and Table 2 above and Table 3 and Table 4 below, and Figure 5 and Figure 7 As shown. Marshall mix design was performed for these two asphalt mixtures. The optimal asphalt content of AC-13 asphalt mixture was 4.2%, and the optimal asphalt content of AC-16 asphalt mixture was 3.9%. At the same time, two gaskets (used as upper gasket 14 and lower gasket 13) with corresponding adhesion failure area sizes (accounting for 91.3%, 84.5% and 75.8% respectively) were cut, and lubricating oil 17 was evenly applied to the inside and outside of the gaskets. From Table 3 and Figure 7 As can be seen from the table 4 below, the volume parameters of the lower layer asphalt mixture 11 using AC-16 asphalt mixture meet the requirements of the specification.
[0097] Table 3: Design gradation of AC-16 asphalt mixture
[0098] Sieve hole (mm) 19.0 16.0 13.2 9.5 4.75 2.36 1.18 0.6 0.3 0.075 Pass rate (%) 100 98.6 93.1 70.9 48.6 39.0 27.2 17.7 11.1 8.5
[0099] Table 4: AC-16 asphalt mixture volume parameters
[0100]
[0101] Step 2: After the asphalt mixture is mixed, pour the lower layer of AC-16 asphalt mixture 11 into the lower part of the Marshall mold 20 and tamp it to ensure that the surface of the mixture is flat; then place the lower gaskets 13 in sequence, apply a proper amount of lubricating oil 17 between the gaskets, and then place the upper gaskets 14. Then pour the upper layer of AC-13 asphalt mixture 12 into the Marshall mold 20 and record the mass of the upper layer of asphalt mixture 12, which is recorded as m 上层位 The specific process here has been described in detail in the previous part of this article and will not be repeated here.
[0102] Step 3: Perform Marshall compaction on the asphalt mixture specimen 10 to ensure that the asphalt mixture meets the compaction requirements of the specification. Subsequently, the asphalt mixture specimen 10 is cooled and demolded. The volume parameters of the demolded asphalt mixture specimen are then tested based on the "Test Procedure for Asphalt and Asphalt Mixtures in Highway Engineering JTG E20-2011" as shown in Table 5 below; then, the upper and lower surfaces of the asphalt mixture specimen 10 are adhered to the pulling fixture 30, and the specimen is placed in a hydraulic servo instrument for a pulling test, and the maximum pulling force value when the specimen interface breaks is recorded, which is recorded as F max As shown in Table 5 below, the volume parameters of the asphalt mixture specimen after demoulding in Example 2 meet the requirements of the specification.
[0103] Table 5: Volume parameters of AC-13 + AC-16 asphalt mixture used in Example 2
[0104]
[0105] Step 4: Based on the maximum pull-out force value of the asphalt mixture specimen interface fracture under different interlayer adhesion failure states and the corresponding reserved cross-sectional size data, combined with the adhesion calculation formula, the adhesion pull-out stress value of the asphalt mixture with different interlayer adhesion failure areas can be calculated, such as Figure 8 As shown in the figure, when the interlayer adhesion failure area (that is, the area of the controllable reserved section 15) 预留截面 ) accounts for 91.3%, the pull-out force is 0.17 MPa. When the interlayer adhesion failure area is reduced to 84.5%, the pull-out force increases to 0.23 MPa. When the interlayer adhesion failure area is further reduced to 75.8%, the pull-out force continues to increase to 0.25 MPa. In other words, as the interlayer adhesion failure increases, the interlayer tensile stress of the asphalt pavement will significantly decrease. Quantitatively speaking, as the interlayer adhesion failure increases by about 10%, the interlayer tensile stress of the asphalt pavement will decrease by about 10%. The experimental results are consistent with the actual law.
[0106] Based on the test results of the above-mentioned embodiment 2, it can be proved that the test method for evaluating the asphalt mixture and interlayer adhesion performance proposed in the embodiment of the present application has obvious discrimination and sensitivity for the adhesion performance of the asphalt mixture under the interlayer adhesion failure state. The test results are in line with the actual laws, further verifying the reliability, effectiveness and accuracy of the test method for evaluating the asphalt mixture and interlayer adhesion performance provided by the present application. At the same time, the test method is simple and efficient, which is conducive to use in extensive large-scale engineering practice.
[0107] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.
Claims
1. A test equipment for evaluating the adhesion performance of asphalt mixture and interlayer, characterized in that: include: Marshall Die; and An asphalt mixture specimen, comprising a lower layer asphalt mixture and an upper layer asphalt mixture located at the lower and upper portions of the Marshall mold, respectively, and a lower gasket laid on the upper surface of the lower layer asphalt mixture, and an upper gasket laid on the lower surface of the upper layer asphalt mixture, wherein the upper gasket and the lower gasket are both provided with controllable reserved cross-sections with upper and lower through-openings at the same position, and portions of the upper gasket and the lower gasket excluding the controllable reserved cross-sections are debonding areas, lubricating oil is filled between the upper surface of the debonding area of the lower gasket and the lower surface of the debonding area of the upper gasket, and the upper gasket and the lower gasket are aligned and placed in contact with each other; as well as A pulling fixture and a hydraulic servo device are provided for performing a pulling test on the asphalt mixture specimen.
2. A method for evaluating the adhesion performance of asphalt mixtures and interlayers, based on the equipment for evaluating the adhesion performance of asphalt mixtures and interlayers according to claim 1, characterized in that: The evaluation test method includes: Step 100: Prepare the raw materials required for preparing the asphalt mixture specimen, including asphalt mixture, upper gasket, lower gasket and lubricating oil. The upper gasket and the lower gasket have the same shape and structure, and the upper gasket and the lower gasket have a controllable reserved section with upper and lower through holes at the same position. The area of the controllable reserved section is Area. 预留截面 ; Step 200: Prepare an asphalt mixture specimen by stacking the lower layer asphalt mixture, lower gasket, lubricating oil, upper gasket and upper layer asphalt mixture into a Marshall mold from bottom to top, and record the mass of the upper layer asphalt mixture, which is recorded as m. 上层位 ; Step 300, performing Marshall compaction treatment on the asphalt mixture specimen; Step 400: Perform a pull-out test on the asphalt mixture specimen and record the maximum pull-out force when the asphalt mixture specimen fractures at the interface, which is recorded as F. max ; Step 500: Based on the obtained data, the adhesion strength of the asphalt mixture and its layers is obtained, which is denoted as f 黏 , and obtain the evaluation results of asphalt mixture and interlayer adhesion performance.
3. The evaluation test method according to claim 2, characterized in that: In step 500, the adhesion strength of the asphalt mixture and its interlayers is calculated based on the obtained data and combined with the adhesion calculation formula, which is denoted as f 黏 ; The adhesion calculation formula is: Among them, f 黏 Represents the adhesion strength of asphalt mixture and its layers, in MPa, F max Represents the maximum pull-out force when the asphalt mixture specimen breaks at the interface, in N, m 上层位 Represents the mass of the upper layer asphalt mixture, in kg, Area 预留截面 Represents the area of the controllable reserved section opened by the upper gasket and the lower gasket, in mm 2 .
4. The evaluation test method according to claim 2, characterized in that: In step 200, the process of preparing the asphalt mixture specimen is as follows: the lower layer asphalt mixture is fully mixed and poured into the lower part of the Marshall mold, and the upper surface of the lower layer asphalt mixture is leveled, and then the lower gasket is flatly spread and placed on the upper surface of the lower layer asphalt mixture, and lubricating oil is applied on the upper surface of the lower gasket, and then the upper gasket is stacked and aligned on the upper surface of the lower gasket coated with the lubricating oil, and then the upper layer asphalt mixture is fully mixed and poured into the Marshall mold and pressed on the upper surface of the upper gasket.
5. The evaluation test method according to claim 2, characterized in that: In step 400, the process of performing a pull-out test on the asphalt mixture specimen is as follows: first, the asphalt mixture specimen is cooled and demolded, then the upper and lower surfaces of the asphalt mixture specimen are bonded to a pull-out fixture, and then the asphalt mixture specimen is placed in a hydraulic servo device for a pull-out test.
6. The evaluation test method according to claim 5, characterized in that: Epoxy resin curing glue is evenly applied to the upper and lower surfaces of the asphalt mixture specimen and the contact portion with the drawing fixture, and is left to stand for at least 12 hours before being placed in the hydraulic servo device for a drawing test.
7. The evaluation test method according to any one of claims 2 to 6, characterized in that: In step 100, the controllable reserved cross section is opened at the center position of the upper gasket and the lower gasket, and the shape of the controllable reserved cross section is a regular shape such as a circle or a square or an irregular shape; and / or A plurality of controllable reserved sections are provided at a plurality of positions on the upper gasket and the lower gasket.
8. The evaluation test method according to claim 7, characterized in that: Cutting two identical annular gaskets to serve as the upper gasket and the lower gasket respectively; and / or The upper layer asphalt mixture and the lower layer asphalt mixture are asphalt mixtures of the same type or asphalt mixtures of different types.
9. The evaluation test method according to claim 8, characterized in that: The accuracy was verified at service temperatures of -10°C, 20°C, and 40°C; It was found that when the service temperature was 40°C, the pull-out strength was 0.4 MPa, when the service temperature was 15°C, the pull-out strength was 1.3 MPa, and when the service temperature was -10°C, the pull-out strength was 5.1 MPa.
10. The evaluation test method according to claim 8, characterized in that: The accuracy was verified when the interlayer adhesion failure area accounted for 91.3%, 84.5%, and 75.8% of the controllable reserved cross-section area, and the upper layer asphalt mixture and the lower layer asphalt mixture adopted AC-13 and AC-16 gradations, respectively. It was found that when the interlayer adhesion failure area accounted for 91.3%, the pull-out force value was 0.17 MPa, when the interlayer adhesion failure area accounted for 84.5%, the pull-out force value was 0.23 MPa, and when the interlayer adhesion failure area accounted for 75.8%, the pull-out force value was 0.25 MPa.