System and method for evaluating crack resistance of asphalt mixture
By designing an asphalt mixture anti-cracking performance evaluation system and adopting a variety of low-temperature performance test methods, the problem that the evaluation methods in existing technologies are difficult to accurately reflect the stability and durability of asphalt mixtures under special climatic and geological conditions has been solved. This has achieved accurate evaluation and high-quality selection of asphalt mixtures, and improved the performance of roads in extreme environments.
Patent Information
- Application Number
- CN202510824203.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-19
- Publication Date
- 2025-09-12
AI Technical Summary
Existing evaluation methods for the crack resistance of asphalt mixtures are difficult to accurately reflect their stability and durability in extreme environments under special climatic and geological conditions. Indoor tests cannot fully simulate the actual environment, and on-site observations are limited by time and cost.
A crack resistance evaluation system for asphalt mixtures was designed, which included an asphalt material testing unit, an asphalt mixture batching unit, an asphalt mixture testing unit, and a crack resistance testing unit. The crack resistance of asphalt mixtures was comprehensively evaluated through multiple low-temperature performance tests, including ductility test, BBR test, low-temperature shrinkage test, and freeze-thaw splitting test.
It achieves accurate evaluation of asphalt mixtures in harsh environments, provides recommendations for selecting high-quality asphalt mixtures, and improves the stability and durability of roads under extreme climatic and geological conditions.
Smart Images
Figure CN120628854A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of road engineering, and in particular to a system and method for evaluating the anti-cracking performance of asphalt mixtures. Background Art
[0002] Road construction in some regions faces numerous challenges due to their unique geographical location and climatic conditions. Firstly, these areas experience significant temperature swings, with scorching summers and freezing winters, creating a harsh environment. These extreme conditions place higher demands on the performance of asphalt mixtures. Secondly, the complex geological conditions in these regions, with some areas experiencing salinization and permafrost, further complicate road construction. Therefore, accurately evaluating the crack resistance of asphalt mixtures to ensure road stability and durability under these extreme climatic and geological conditions has become a pressing issue in road engineering.
[0003] Existing methods for testing and evaluating the crack resistance of asphalt mixtures are primarily based on indoor testing and field observations. However, these methods often have shortcomings in the unique climatic and geological conditions of specific regions. For example, temperature control and loading methods used in indoor testing may not fully simulate the actual conditions in certain harsh environments. Field observations, however, are limited by time and cost, making it difficult to fully and accurately reflect the crack resistance of asphalt mixtures. Therefore, a method for evaluating the crack resistance of asphalt mixtures specifically tailored to the characteristics of these harsh environments is urgently needed. Summary of the Invention
[0004] In order to solve the problems existing in the prior art, the present invention provides a system and method for evaluating the anti-cracking performance of asphalt mixtures, which are used for comprehensive testing and evaluation of the anti-cracking performance of asphalt mixtures in harsh environmental areas.
[0005] To achieve the above object, the present invention provides the following solutions:
[0006] An asphalt mixture crack resistance evaluation system includes: an asphalt material testing unit, an asphalt mixture batching unit, an asphalt mixture testing unit and a crack resistance testing unit;
[0007] The asphalt material testing unit is used to perform a low-temperature performance test on a preset modified asphalt material to obtain a low-temperature performance A of the modified asphalt material;
[0008] The asphalt mixture batching unit is used to use predetermined stones and grade the preset modified asphalt materials to prepare an asphalt mixture;
[0009] The asphalt mixture testing unit is used to perform a low temperature performance test on the asphalt mixture to obtain the low temperature performance B of the asphalt mixture;
[0010] The anti-cracking performance testing unit is used to comprehensively evaluate the anti-cracking performance Q of the asphalt mixture based on the low-temperature performance A of the modified asphalt material and the low-temperature performance B of the asphalt mixture.
[0011] Preferably, the preset modified asphalt material includes heavy traffic asphalt, SBS modified asphalt and rubber asphalt.
[0012] Preferably, in the asphalt material testing unit, the method for performing a low-temperature performance test on the preset modified asphalt material to obtain the low-temperature performance A of the modified asphalt material includes:
[0013] The low-temperature performance of the preset modified asphalt material is tested by using a ductility test and a BBR test to obtain the low-temperature performance A of the modified asphalt material.
[0014] Preferably, the asphalt mixture prepared in the asphalt mixing unit includes: heavy traffic asphalt mixture, SBS modified asphalt mixture and rubber asphalt mixture;
[0015] In the asphalt mixture testing unit, the method for performing a low temperature performance test on the asphalt mixture to obtain the low temperature performance B of the asphalt mixture includes:
[0016] The low-temperature performance of the asphalt mixture is tested by adopting a low-temperature shrinkage test and a freeze-thaw splitting test to obtain the low-temperature performance B of the asphalt mixture.
[0017] Preferably, the crack resistance Q of the asphalt mixture is:
[0018] Q=h*A+l*B, where h and l are correlation coefficients.
[0019] The present invention also provides a method for evaluating the anti-cracking performance of asphalt mixture, comprising the following steps:
[0020] Conducting a low-temperature performance test on a preset modified asphalt material to obtain the low-temperature performance A of the modified asphalt material;
[0021] Using predetermined stones, grading with the preset modified asphalt material, and preparing an asphalt mixture;
[0022] Performing a low temperature performance test on the asphalt mixture to obtain a low temperature performance B of the asphalt mixture;
[0023] Based on the low-temperature performance A of the modified asphalt material and the low-temperature performance B of the asphalt mixture, the anti-cracking performance Q of the asphalt mixture is comprehensively evaluated.
[0024] Preferably, the preset modified asphalt material includes heavy traffic asphalt, SBS modified asphalt and rubber asphalt.
[0025] Preferably, the method of performing a low-temperature performance test on the preset modified asphalt material to obtain the low-temperature performance A of the modified asphalt material includes:
[0026] The low-temperature performance of the preset modified asphalt material is tested by using a ductility test and a BBR test to obtain the low-temperature performance A of the modified asphalt material.
[0027] Preferably, the asphalt mixture includes: heavy traffic asphalt mixture, SBS modified asphalt mixture and rubber asphalt mixture;
[0028] The method of conducting a low temperature performance test on the asphalt mixture to obtain the low temperature performance B of the asphalt mixture includes:
[0029] The low-temperature performance of the asphalt mixture is tested by adopting a low-temperature shrinkage test and a freeze-thaw splitting test to obtain the low-temperature performance B of the asphalt mixture.
[0030] Preferably, the crack resistance Q of the asphalt mixture is:
[0031] Q=h*A+l*B, where h and l are correlation coefficients.
[0032] Compared with the prior art, the present invention has the following beneficial effects:
[0033] Aiming at the special climate and geological characteristics of harsh environmental areas, the present invention designs multiple low-temperature performance tests from asphalt materials to asphalt mixtures, thereby achieving accurate evaluation of the anti-cracking performance of asphalt mixtures.
[0034] The present invention is an evaluation method combining the high-temperature performance and durability of asphalt mixtures, which can provide high-quality asphalt mixture selection suggestions for road construction, thereby improving road stability and durability. BRIEF DESCRIPTION OF THE DRAWINGS
[0035] In order to more clearly illustrate the technical solution of the present invention, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.
[0036] Figure 1 This is a flow chart of a method for evaluating the anti-cracking performance of asphalt mixtures according to the second embodiment of the present invention. DETAILED DESCRIPTION
[0037] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.
[0038] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.
[0039] Example 1
[0040] The present invention provides an asphalt mixture anti-cracking performance evaluation system, which specifically comprises: an asphalt material testing unit, an asphalt mixture batching unit, an asphalt mixture testing unit and an anti-cracking performance testing unit.
[0041] Specifically, in this embodiment, the asphalt material testing unit is used to perform a low-temperature performance test on a preset modified asphalt material to obtain the modified asphalt material low-temperature performance A. This low-temperature performance analysis is used to comprehensively determine the impact on the crack resistance of the asphalt mixture. The preset modified asphalt materials include heavy traffic asphalt, SBS modified asphalt, and rubber asphalt. The low-temperature performance test uses a ductility test and a BBR test. In this embodiment, the heavy traffic asphalt is preferably 90# asphalt, the SBS modified asphalt is preferably 1-B modified asphalt, and the rubber asphalt is preferably rubber asphalt that meets the requirements of Xinjiang local standards.
[0042] The ductility test method is as follows: the asphalt material is subjected to a rotating film aging test, and then a ductility test is carried out at a set temperature. The test temperature for heavy traffic asphalt is 10 degrees Celsius, and the test temperature for SBS modified asphalt and rubber asphalt is 5 degrees Celsius.
[0043] The BBR test method is as follows: the asphalt material is subjected to a rotating film test, followed by a PAV aging test, and then a BBR test. The design low temperature of No. 90 heavy traffic asphalt PG grade is -22°C, and the test temperature is -12°C; the design temperature of SBS modified asphalt and rubber asphalt PG grade is -28°C, and the test temperature is -18°C.
[0044] The asphalt batching unit is used to prepare asphalt mixtures using pre-defined aggregates and pre-defined modified asphalt materials. These asphalt mixtures include heavy traffic asphalt mixtures, SBS modified asphalt mixtures, and rubberized asphalt mixtures. The specific aggregates and gradations must comply with the Technical Specifications for Highway Asphalt Pavement Construction.
[0045] The asphalt mixture test unit is used to test the low-temperature performance of asphalt mixtures, obtaining the asphalt mixture low-temperature performance B. The low-temperature crack resistance of asphalt mixtures is evaluated by testing their resistance to low-temperature shrinkage cracking. The low-temperature performance tests utilize a low-temperature shrinkage test and a freeze-thaw splitting test. Specifically, the low-temperature shrinkage test parameters are: a test temperature of -10°C ± 0.5°C and a loading rate of 50 mm / min. The freeze-thaw splitting test parameters are: a test temperature of -10°C ± 0.5°C and a loading rate of 1 mm / min.
[0046] The crack resistance test unit is used to comprehensively evaluate the crack resistance Q of the asphalt mixture based on the low-temperature performance A of the modified asphalt material and the low-temperature performance B of the asphalt mixture. Specifically, Q = h*A + l*B, where h and l are correlation coefficients.
[0047] Example 2
[0048] like Figure 1 FIG. 2 shows a method for evaluating the anti-cracking performance of asphalt mixture according to a second embodiment of the present invention, comprising the following steps:
[0049] S1. Perform a low-temperature performance test on a preset modified asphalt material to obtain the modified asphalt material low-temperature performance A. This low-temperature performance analysis is used to comprehensively determine the impact on the crack resistance of the asphalt mixture. The preset modified asphalt materials include heavy traffic asphalt, SBS modified asphalt, and rubber asphalt. The low-temperature performance test uses a ductility test and a BBR test. In this embodiment, the heavy traffic asphalt is preferably 90# asphalt, the SBS modified asphalt is preferably 1-B modified asphalt, and the rubber asphalt is preferably rubber asphalt that meets the requirements of Xinjiang local standards.
[0050] The ductility test method is as follows: the asphalt material is subjected to a rotating film aging test, and then a ductility test is carried out at a set temperature. The test temperature for heavy traffic asphalt is 10 degrees Celsius, and the test temperature for SBS modified asphalt and rubber asphalt is 5 degrees Celsius.
[0051] The BBR test method is as follows: the asphalt material is subjected to a rotating film test, followed by a PAV aging test, and then a BBR test. The design low temperature of No. 90 heavy traffic asphalt PG grade is -22°C, and the test temperature is -12°C; the design temperature of SBS modified asphalt and rubber asphalt PG grade is -28°C, and the test temperature is -18°C.
[0052] S2. Asphalt mixtures are prepared using the designated stone and pre-selected modified asphalt materials. Stones commonly used in Xinjiang are selected, and commonly used gradations are used to prepare asphalt mixtures, including heavy traffic asphalt mixtures, SBS modified asphalt mixtures, and rubber asphalt mixtures. The specific stone and gradation must comply with the Technical Specifications for Highway Asphalt Pavement Construction.
[0053] S3. Conduct a low-temperature performance test on the asphalt mixture to obtain the asphalt mixture low-temperature performance B; evaluate the low-temperature crack resistance of the asphalt mixture by testing its resistance to low-temperature shrinkage cracking. The low-temperature performance test utilizes a low-temperature shrinkage test and a freeze-thaw splitting test. Specifically, the low-temperature shrinkage test parameters are: a test temperature of -10°C ± 0.5°C and a loading rate of 50 mm / min. The freeze-thaw splitting test parameters are: a test temperature of -10°C ± 0.5°C and a loading rate of 1 mm / min.
[0054] S4. Based on the low-temperature performance A of the modified asphalt material and the low-temperature performance B of the asphalt mixture, comprehensively evaluate the anti-cracking performance Q of the asphalt mixture, specifically Q = h*A + l*B, where h and l are correlation coefficients.
[0055] Example 3
[0056] In order to further illustrate the technical solution and technical effects of the present invention, this embodiment takes Xinjiang as an example to illustrate the impact of Xinjiang's unique geographical location and climatic conditions on asphalt performance, and illustrates the technical solution.
[0057] Due to its unique geographical location and climatic conditions, road construction in Xinjiang faces numerous challenges. Firstly, Xinjiang's extreme temperature swings, with scorching summers and freezing winters, place higher demands on the performance of asphalt mixtures. Secondly, Xinjiang's complex geological conditions, with salinization and permafrost in some areas, further complicate road construction. Consequently, these methods often fall short in addressing Xinjiang's unique climate and geology, making it difficult to accurately evaluate the crack resistance of asphalt mixtures and ensure the stability and durability of roads under these extreme conditions.
[0058] Karamay No. 90 asphalt was subjected to rotary film aging to test its ductility. Based on the rotary film aging, PAV aging and BBR testing were performed. Karamay No. 90 asphalt and basalt stone were used, using an SMA-13 gradation and an asphalt-to-stone ratio of 4.5% to prepare the asphalt mixture. Marshall and rutting plate specimens were then prepared and cut into small beam specimens. Low-temperature flexural tensile tests and freeze-thaw splitting tests were performed in accordance with regulatory requirements. The relevant data are shown in Table 1.
[0059] Table 1
[0060]
[0061] 1-B SBS modified asphalt was subjected to rotary film aging to test its ductility. Based on the rotary film aging, PAV aging and BBR testing were also performed. An asphalt mixture was prepared using 1-B SBS modified asphalt and basalt rock using an SMA-13 gradation with an asphalt-to-aggregate ratio of 4.8%. Marshall and rutting plate specimens were then prepared and cut into small beam specimens. Low-temperature flexural tensile tests and freeze-thaw splitting tests were performed in accordance with regulatory requirements. The relevant data are shown in Table 2.
[0062] Table 2
[0063]
[0064] Asphalt rubber was subjected to rotary film aging to test its ductility. Following this aging, PAV aging and BBR testing were performed. Asphalt rubber and basalt stone were prepared using an SMA-13 gradation with an asphalt-to-stone ratio of 5.0%. Marshall and rutting plate specimens were then prepared and cut into small beam specimens. Low-temperature flexural tensile tests and freeze-thaw splitting tests were conducted in accordance with regulatory requirements. The relevant data are shown in Table 3.
[0065] Table 3
[0066]
[0067] The values of A and B in the above examples are related to the test temperature and parameters, and different weighted values can be derived based on different models. In this example, h is 0.4 and l is 0.6, and the asphalt mixture crack resistance index Q is derived based on the values of A and B. The relevant data in the examples show that the rubber asphalt mixture and the 1-B SBS modified asphalt mixture have better crack resistance.
[0068] In view of the climate and geological characteristics of Xinjiang, the present invention designs multiple low-temperature performance tests from asphalt materials to asphalt mixtures, thereby achieving accurate evaluation of the anti-cracking performance of asphalt mixtures.
[0069] The asphalt mixture obtained through comprehensive evaluation was applied and verified in actual road construction, and the evaluation method was optimized and improved based on the on-site observation results, making the evaluation method closer to engineering practice and having stronger practicality and operability.
[0070] This invention provides technical support for the performance evaluation and verification of asphalt mixtures for road construction in Xinjiang. Combined with the evaluation method of high-temperature performance and durability of asphalt mixtures, it can provide high-quality asphalt mixture selection suggestions for road construction, thereby improving road stability and durability.
[0071] The embodiments described above are merely descriptions of preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Without departing from the spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by persons skilled in the art should fall within the scope of protection defined by the claims of the present invention.
Claims
1. An asphalt mixture crack resistance evaluation system, characterized in that: Including: asphalt material testing unit, asphalt mixture batching unit, asphalt mixture testing unit and crack resistance testing unit; The asphalt material testing unit is used to perform a low-temperature performance test on a preset modified asphalt material to obtain a low-temperature performance A of the modified asphalt material; The asphalt mixture batching unit is used to use predetermined stones and grade the preset modified asphalt materials to prepare an asphalt mixture; The asphalt mixture testing unit is used to perform a low temperature performance test on the asphalt mixture to obtain the low temperature performance B of the asphalt mixture; The anti-cracking performance testing unit is used to comprehensively evaluate the anti-cracking performance Q of the asphalt mixture based on the low-temperature performance A of the modified asphalt material and the low-temperature performance B of the asphalt mixture.
2. The system according to claim 1, wherein: The preset modified asphalt materials include heavy traffic asphalt, SBS modified asphalt and rubber asphalt.
3. The system according to claim 2, characterized in that In the asphalt material testing unit, the method for performing a low-temperature performance test on the preset modified asphalt material to obtain the low-temperature performance A of the modified asphalt material includes: The low-temperature performance of the preset modified asphalt material is tested by using a ductility test and a BBR test to obtain the low-temperature performance A of the modified asphalt material.
4. The system according to claim 2, wherein: The asphalt mixture prepared in the asphalt mixing unit includes: heavy traffic asphalt mixture, SBS modified asphalt mixture and rubber asphalt mixture; In the asphalt mixture testing unit, the method for performing a low temperature performance test on the asphalt mixture to obtain the low temperature performance B of the asphalt mixture includes: The low-temperature performance of the asphalt mixture is tested by adopting a low-temperature shrinkage test and a freeze-thaw splitting test to obtain the low-temperature performance B of the asphalt mixture.
5. The system according to claim 1, wherein: The anti-cracking performance Q of the asphalt mixture is: Q=h*A+l*B, where h and l are correlation coefficients.
6. A method for evaluating the anti-cracking performance of asphalt mixture, characterized in that: The steps include: Conducting a low-temperature performance test on a preset modified asphalt material to obtain the low-temperature performance A of the modified asphalt material; Using predetermined stones, grading with the preset modified asphalt material, and preparing an asphalt mixture; Performing a low temperature performance test on the asphalt mixture to obtain a low temperature performance B of the asphalt mixture; Based on the low-temperature performance A of the modified asphalt material and the low-temperature performance B of the asphalt mixture, the anti-cracking performance Q of the asphalt mixture is comprehensively evaluated.
7. The method according to claim 6, characterized in that The preset modified asphalt materials include heavy traffic asphalt, SBS modified asphalt and rubber asphalt.
8. The method according to claim 7, characterized in that The method of performing a low-temperature performance test on the preset modified asphalt material to obtain the low-temperature performance A of the modified asphalt material includes: The low-temperature performance of the preset modified asphalt material is tested by using a ductility test and a BBR test to obtain the low-temperature performance A of the modified asphalt material.
9. The method according to claim 7, characterized in that The asphalt mixture includes: heavy traffic asphalt mixture, SBS modified asphalt mixture and rubber asphalt mixture; The method of conducting a low temperature performance test on the asphalt mixture to obtain the low temperature performance B of the asphalt mixture includes: The low-temperature performance of the asphalt mixture is tested by adopting a low-temperature shrinkage test and a freeze-thaw splitting test to obtain the low-temperature performance B of the asphalt mixture.
10. The method according to claim 6, characterized in that The anti-cracking performance Q of the asphalt mixture is: Q=h*A+l*B, where h and l are correlation coefficients.