GB2612152A - Method and system for evaluating crack resistance of asphalt mixture under intermediate-temperature condition, and storage medium - Google Patents
Method and system for evaluating crack resistance of asphalt mixture under intermediate-temperature condition, and storage medium Download PDFInfo
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- 239000000203 mixture Substances 0.000 title claims description 78
- 239000010426 asphalt Substances 0.000 title claims description 63
- 238000000034 method Methods 0.000 title claims description 33
- 238000012360 testing method Methods 0.000 claims abstract description 46
- 238000011068 loading method Methods 0.000 claims abstract description 35
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- 238000005336 cracking Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- NAWXUBYGYWOOIX-SFHVURJKSA-N (2s)-2-[[4-[2-(2,4-diaminoquinazolin-6-yl)ethyl]benzoyl]amino]-4-methylidenepentanedioic acid Chemical compound C1=CC2=NC(N)=NC(N)=C2C=C1CCC1=CC=C(C(=O)N[C@@H](CC(=C)C(O)=O)C(O)=O)C=C1 NAWXUBYGYWOOIX-SFHVURJKSA-N 0.000 description 2
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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- G01N33/42—Road-making materials
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0019—Compressive
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/022—Environment of the test
- G01N2203/0222—Temperature
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Abstract
An intermediate-temperature splitting test is performed on a specimen. Splitting force, vertical displacement of a loading indenter, and lateral deformation of the specimen are recorded and used to calculate splitting stiffness. A formula for splitting stiffness may contain these terms, and also specimen thickness, width of the indenter, and specimen diameter coefficients. A time-varying curve of splitting stiffness is obtained. A peak value of the splitting stiffness curve is taken as an index in evaluating specimen crack resistance. A greater peak value of the splitting stiffness curve may indicate a stronger crack resistance. The splitting test may be performed at least three times.
Description
METHOD AND SYSTEM FOR EVALUATING CRACK RESISTANCE OF ASPHALT
MIXTURE UNDER INTERMEDIATE-TEMPERATURE CONDITION, AND STORAGE
MEDIUM
TECHNICAL FIELD
[1] The present disclosure relates to the technical field of road engineering, and in particular to a method and system for evaluating crack resistance of an asphalt mixture under an intermediate-temperature condition, and a storage medium.
BACKGROUND ART
[2] Intermediate-temperature crack resistance is one of the important performance indexes of an asphalt mixture, which is of great significance to delay the fatigue cracking of asphalt pavement and improve the service life of the pavement. In the design or optimization of the asphalt mixture, it is necessary to accurately evaluate the intermediate-temperature crack resistance to ensure that the designed and optimized mixture is capable of well serving in the field pavement.
[3] The splitting test is a commonly used method to evaluate the intermediate-temperature crack resistance of the asphalt mixture. At present, Several indexes have been developed based on the splitting test results to characterize the intermediate-temperature crack resistance of the asphalt mixture, including splitting strength (RI), maximum displacement (Ls), fracture energy (GO, crack resistance index (ICT), and fracture work (W). The splitting strength is calculated from the maximum peak force in the splitting test, which reflects the overall strength of the asphalt mixture and belongs to the category of mechanical indexes. It is commonly believed that greater splitting strength indicates a stronger crack resistance for asphalt mixture. The maximum displacement (Ls) refers to the total deformation of a specimen from the beginning of loading to the failure, which reflects the deformation resistance of the asphalt mixture. In general, a higher Ls value of the specimen indicates a stronger crack resistance. The fracture energy (GO refers to the work done per unit length of crack propagation per unit area, that is, the external force work absorbed per unit area of the fracture. It is commonly believed that a greater Gf value corresponds to a stronger crack resistance of the asphalt mixture. The crack resistance index (ICT) is a normalized index based on energy. This indicator is derived according to the classical Paris formula in the fracture mechanics area. Specifically, the ICT is calculated from the fracture energy value of the specimen and parameters in the second half of a "load-displacement" curve, which reflects the crack propagation resistance of the asphalt mixture. It is generally believed that a greater crack resistance index ICT indicates the stronger low-temperature performance of the asphalt mixture.
[4] By summarizing the above evaluation indexes of the intermediate-temperature crack resistance of the asphalt mixture, it is found that the above indexes mainly reflect the overall strength and crack propagation resistance of the asphalt mixture, or the overall strength and crack propagation resistance of comprehensive asphalt mixture. In fact, the stress-deformation characteristics of the specimen before failure can better reflect the crack resistance deformation process of the asphalt mixture under external force. If the crack resistance of the asphalt mixture is evaluated only by the splitting strength or the deformation parameters after the strength failure, the deformation characteristics of the asphalt mixture before cracking are ignored, which easily results in a biased evaluation result for the crack resistance of the asphalt mixture.
[5] Therefore, during the evaluation of the intermediate-temperature crack resistance of the asphalt mixture, it is necessary to further consider the deformation characteristics of the asphalt mixture before the strength failure, so as to more comprehensively evaluate the deformation and cracking process of the asphalt mixture under the action of an external force, thereby evaluating the intermediate-temperature crack resistance of the asphalt mixture more accurately.
SUMMARY
[6] In view of this, the present disclosure provides a method and system for evaluating crack resistance of an asphalt mixture under an intermediate-temperature condition, and a storage medium, so as to solve the problems existing in the background art, and simultaneously consider a splitting force and deformation characteristics in a material splitting test through a splitting stiffness index, which can more accurately evaluate the crack resistance of the asphalt mixture at a medium temperature.
[7] In order to achieve the above objective, the present disclosure adopts the following technical solutions: according to one aspect, a method for evaluating crack resistance of an asphalt mixture under an intermediate-temperature condition is provided, and includes the following specific steps: [8] performing a splitting test on a specimen at intermediate-temperature condition, and recording a splitting force, a vertical displacement of a loading indenter, and a lateral deformation value of the specimen synchronously during the test; [9] calculating splitting stiffness according to the splitting force, the vertical displacement of the loading indenter, and the lateral deformation value of the specimen; [10] combined with the splitting stiffness, obtaining a dynamic curve of the splitting stiffness varying with time; and [11] evaluating the crack resistance of the specimen by taking a peak value of the dynamic curve as an index.
[12] By adopting the above technical solution, the present disclosure has the following beneficial technical effects: the method of the present disclosure can consider both force and deformation characteristics of the asphalt mixture before failure of the specimen, as compared with other methods. In addition, it is advanced in ranking the crack resistances of the different asphalt mixtures under the condition that the splitting forces of those mixtures are similar but their deformation characteristics are different.
[13] Optionally, a calculation formula of the splitting stiffness may be: = 2F (aib, -c1/2b1) S ni9h(a2Ly + b2Lx) * [14] s may be the splitting stiffness. F may be the splitting force. LY may be the vertical displacement of the loading indenter. x may be the lateral deformation value of the specimen. h may be a thickness of the specimen. 0 may be a width of the loading indenter. at, C12, In, and in may be diameter coefficients of the specimen.
[15] Optionally, a greater peak value may indicate stronger crack resistance of the asphalt mixture.
[16] Optionally, the intermediate-temperature splitting test may be performed at least three times.
[17] By adopting the above technical solution, the present disclosure has the following beneficial technical effects: for each asphalt mixture to be evaluated, at least three parallel tests shall be performed to improve the test accuracy and reliability.
[18] According to another aspect, a system for evaluating crack resistance of an asphalt mixture under an intermediate-temperature condition is provided, including: a data acquisition module, a data processing module, a curve calculation module, and an evaluation module.
[19] The data acquisition module is configured to perform an intermediate-temperature splitting test on a specimen, and record a splitting force, vertical displacement of a loading indenter, and a lateral deformation value of the specimen synchronously during the test.
[20] The data processing module is configured to calculate splitting stiffness according to the splitting force, the vertical displacement of the loading indenter, and the lateral deformation value of the specimen.
[21] The curve calculation module is configured to obtain a dynamic curve of the splitting stiffness varying with time.
[22] The evaluation module is configured to evaluate the crack resistance of the specimen by taking a peak value of the dynamic curve as an index.
[23] Finally, a computer storage medium is provided, a computer program is stored on the computer storage medium, and when the computer program is executed by a processor, steps of the method for evaluating crack resistance of an asphalt mixture under an intermediate-temperature condition are realized.
[24] It can be seen from the above technical solutions that compared with the prior art, the present disclosure provides the method, system and storage medium for evaluating crack resistance of an asphalt mixture under an intermediate-temperature condition, which can simultaneously consider the splitting force and corresponding deformation characteristics in the material splitting test, overcomes the disadvantage of ignoring the material deformation characteristics before failure in the prior art, and can more accurately and comprehensively evaluate the crack resistance of the asphalt mixture.
BRIEF DESCRIPTION OF THE DRAWINGS
[25] To describe the technical solutions in the embodiments of the present disclosure or in the prior art more clearly, the following section briefly describes the accompanying drawings required for describing the embodiments or the prior art. Apparently, the accompanying drawings in the following description merely show the embodiments of the present disclosure, and those of ordinary skill in the art may still derive other drawings from the provided accompanying drawings without creative efforts.
[26] FIG. 1 is a flowchart of a method according to the present disclosure; [27] FIG. 2 is a schematic diagram of loading of a splitting test according to the present disclosure; [28] FIG. 3 is a schematic diagram showing the varying trends of the loading force, vertical displacement of an indenter, and lateral deformation of a specimen with loading time in the splitting test according to the present disclosure; [29] FIG. 4 is a schematic diagram showing the varying trend of splitting stiffness with the loading time in the splitting test according to the present disclosure; [30] FIG. 5 is a comparison diagram of peak splitting forces of two types of specimens according to an embodiment of the present disclosure; [31] FIG. 6 is a comparison diagram of central lateral deformation of the two types of specimens according to the embodiment of the present disclosure; and [32] FIG. 7 is a comparison diagram of splitting stiffness curves of the two types of specimens according to the embodiment of the present disclosure.
DETAILED DESCRIPTION OF THE EMBODIMENTS
[33] The technical solutions of the embodiments of the present disclosure are clearly and completely described below with reference to the accompanying drawings. Apparently, the described embodiments are merely some rather than all of the embodiments of the present disclosure. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present disclosure without creative efforts shall fall within the protection scope of the present disclosure.
[34] Embodiment 1 of the present disclosure provides a method for evaluating the intermediate-temperature crack resistance of an asphalt mixture. As shown in FIG. 1, the method includes the following specific steps.
[35] Si, an intermediate-temperature splitting test is performed on a specimen, and a splitting force, vertical displacement of a loading indenter, and a lateral deformation value of the specimen are synchronously recorded during the test.
[36] S2, splitting stiffness is calculated according to the splitting force, the vertical displacement of the loading indenter, and the lateral deformation value of the specimen.
[37] S3, combined with the splitting stiffness, a dynamic curve of the splitting stiffness varying with time is obtained.
[38] S4, the crack resistance of the specimen is evaluated by taking a peak value of the dynamic curve as an index.
[39] Further, in the intermediate-temperature splitting test, a circular asphalt mixture specimen is loaded through a loading strip with a certain width. A schematic diagram of the splitting loading test is shown in FIG. 2. Under the action of a loading force, stress states of the specimen on an x-axis and a y-axis are shown in formulas (2) to (5): (1 -X2) sin 2a x2 1 - 2 2F R2 o-(x)= tan I R2 tanoc) 1+ -2x2cos 2cx + -x4 1+ -fl thh, x R2 R4 R2 (1--x2)sin 2a 1-0,2 X2 R2 +tan -1( '2 tan a) thh 1+ -2x2 x cos 2a + -x4 1+-R2 R4 R2 2 2 (l -R2) sin 2a 1 + Y
Y 2F
tan-1( R22 tan co 1--2y2cos 2a + "= 1-Y R2 R4 R2 2F (1 RY 2)sin 2a 2 Ciyy (Y) - ,4 ± tan A R-tan a) i,2 gOli 1--2y2cos2a + -= 1-' R2 R4 R2 2F an(Y)= nOh (2), (3), (4), and (5).
[40] In the formula, air (x) and (73Y (X) are stress components hi x and y directions on the x-axis, an(Y) and an (Y) are stress components in x and y directions on the y-axis, F is the loading force (kN), h is the thickness of the specimen (m), 0 is the width of the loading strip (m), R is a radius of the specimen (m), and a is a radial angle. tana = 0.126 [41] According to the two-dimensional stress state of the splitting specimen, strain components of the specimen in the x-axis and the y-axis are calculated as follows: (x) = 0-xx(x) vo-yy(x) (6), and Cr yy VCr (y) (7).
[42] S is the splitting stiffness of the specimen (MPa), En(x) is the strain component in the x direction on the x-axis, YYW is the strain component in the y direction on the y-axis, and IT is the Poisson' s ratio of the asphalt mixture.
[43] The integration of etc (x) in the x-axis is the lateral deformation value Lx of the center of the splitting specimen in the splitting test. The integration of En (Y) in the y-axis is a vertical displacement value Lis of the loading indenter in the splitting test. Then formulas (8) to (9) can be obtained: YY(Y) = 2R k= (X)dX = -2R 2R 1 (CT (X) -2R vo-yy(x))dx (8), and (9)- 2R 2R yy vo-r, (y))dy IL, = Eyy(Y)dY = -2R -2R [44] R is the radius of the specimen.
[45] Combined with formulas (8) to (9), the Poisson's ratio parameter v can be eliminated, and the calculation formula of stiffness of the splitting specimen can be solved as follows: - 2F(ak-a2b,) S (10).
[46] In the formula, al, a2, In, and b2 are coefficients related to the diameter of a specimen, and the corresponding calculation formulas are as follows: 2 R (1- x2)si x2 n2a 2R 1-a,-J[ 2R2 ]dx f [tan -1( R2 tan a)]dx -2R 2x x -cos 2 a + - 1 -2R X2 1++ R2 R4 R X2. X2 2R - )sui 2a 2]2 1 - 2 2R2 4 ldr [ail-1( R2 tan a)]dx -2R 3 1+ -2xcos 2a+ -212 1+ R2 R4 R2 yrOh(a2Ly + kLx) (12), m2 (13), and 2R 1 ± = 2R (1 -=) sin 2 a (14).
b1=-.1 [tanA R22 tan a)]dy f [ R2 y -2R 1 -2R1 2y2cos2a+ Y4 di) R2 R2 R4 ii2,22.
2R 1 + = 2R (1-"=)sm2cc b2 = 5 [tan-1( R22 tan a)]dy 54 [ R2 y 2R 1 dY y - -2R 1-2y2 cos 2a-k R2 R2 R4 [47] For a specimen with a diameter of 100 mm or 150 mm, its radius R is 50 mm or 75 mm respectively. Then R=50 mm or R=100 mm is substituted into formulas (11) to (14) to calculate the coefficients ar, a, bi, and bz. The calculation results corresponding to two specimen diameters are summarized in Table 1.
Table 1
Diameter of specimen (mm) al az bi b2 0.0053 0.0196 -0.0703 0.0014 0.008 0.0295 -0.105 0.0015 [48] Based on the coefficients in the above table and formula (10), the curve of the splitting stiffness S of the asphalt mixture versus loading time during the splitting test can be calculated, and a peak value Sfi of the stiffness curve is taken as the index to evaluate the crack resistance of the asphalt mixture. A greater peak value indicates a stronger crack resistance of the asphalt mixture.
[49] Optionally, the intermediate-temperature splitting test is performed at least three times.
[50] The method of the present disclosure is further described below with reference to an embodiment.
[51] In the present embodiment, the intermediate-temperature crack resistances of three types of asphalt mixture specimens are comparatively evaluated. The first type is a hot-mixed asphalt mixture specimen formed by ordinary 70# asphalt, which is defined as specimen A. The second type is named specimen B, which is produced by applying a certain number of fatigue loadings on specimen type A. In other words, specimen B contains a certain amount of fatigue damage as compared with specimen A. The last type is a cold-recycled asphalt mixture specimen formed by the emulsified asphalt, which is defined as specimen C. The three types of asphalt mixture specimens A, B, and C all have diameters of 100 mm.
[52] Specimen B is subjected to a certain amount of fatigue damage, so its crack resistance shall be lower than that of specimen A. Specimen C is made of recycled materials, so its crack resistance shall be significantly lower than that of specimen A and specimen B. In the present embodiment, the method provided by the present disclosure will further quantify the differences in the crack resistances among specimens A, B and C, and further test the reliability of the method provided by the present disclosure.
[53] Splitting tests are performed on the above three types of mixture specimens A, B, and C, and three parallel tests are performed on each type of specimen. The thickness information for the specimens in the parallel tests is summarized in Table 2.
Table 2
Type of mixture Parallel test No. Thickness (mm) A 1 49 2 51 3 40 B 1 64 2 63 3 64 C 1 39 2 40 3 40 [54] The loading indenter in the splitting test has a width of 12.7 mm (corresponding to a specimen with a diameter of 100 mm). The indenter has a loading rate of 50 mm/min, and the test temperature is 15°C. The splitting force F (kN), the vertical displacement of the loading indenter LY (mm), the lateral deformation value of the specimen center k (mm) as well as the loading time t (s) are recorded synchronously during the test. The detection accuracy of the splitting force F is 1 x10-5 kN. The detection accuracy of 4 is Ix10-6 mm. The detection accuracy of LY is 1 X 104 mm.
[55] During the test, when the splitting force F is greater than 0.1 kN, F, , and LY are recorded synchronously. After the splitting force reaches a peak value and drops to 80% of the peak value, data recording is stopped. The frequency of data recording is 100 Hz, that is, the time interval between adjacent data points is 0.01 s. During a splitting test, typical curves of the splitting force F (kN), spindle displacement LY (mm), and lateral deformation of the specimen (mm) with loading time t are shown in FIG. 3.
[56] By substituting the recorded F, 4, and LY data, as well as the thickness data of the specimen in Table 2, into formula (10), the varying trend of the splitting stiffness of the specimen with the time t can be determined. A typical curve of the splitting stiffness is shown in FIG. 4. A peak value of the curve of the splitting stiffness is recorded as an index S.,. (as shown in FIG. 4), which is used to evaluate the crack resistance of the asphalt mixture.
[57] Finally, according to the test results, the values of Smat for three types of mixture specimens A, B, and C are determined and summarized in Table 3.
Table 3
Type of mixture Parallel test No. S (MPa) Average value of S (MPa) 865.19 A 2 946.79 903.43 3 898.30 1 698.80 B 2 562.26 668.20 3 743.55 1 404.34 C 2 442.87 457.39 3 524.97 [58] As shown in Table 3, the average values of Sm corresponding to specimen A, specimen B, and specimen C are 903.43 MPa, 668.20 MPa, and 457.39 MPa, respectively. According to the principle that a greater value of Sn. indicates a stronger crack resistance of the mixture, the rank of the crack resistance of three types of mixtures are A>B>C. The above evaluation results are consistent with the properties of the three types of asphalt mixture specimens, which further proves the rationality and reliability of the method provided by the present disclosure.
[59] In addition, the method provided by the present disclosure is advanced in ranking the crack resistances of the different asphalt mixtures under the condition that the splitting forces of those mixtures are similar but their deformation characteristics are different, as compared with the existing method. In the above embodiment, in the first parallel test of the type A mixture and the third parallel test of the type C mixture, the peak splitting forces of the tested specimens are very similar, as shown in FIG. 5. However, the deformation characteristics of the two types of specimens are quite different, as shown in FIG. 6. If the evaluation is performed according to the splitting strength index in the existing method, the crack resistance of the two types of mixtures is regarded as similar, which is obviously inconsistent with the facts. According to the method provided by the present disclosure, it can be found that the curves of splitting stiffness of the two types of mixtures are obviously different. As shown in FIG. 7, the corresponding peak splitting stiffness S is significantly different. The value of S. of the type A mixture is significantly higher than that of the type C mixture, implying that the crack resistance of the type A mixture is stronger than that of type B mixture, which is consistent with the properties of two types of mixtures. Therefore, the method provided by the present disclosure simultaneously considers the splitting force characteristics and deformation characteristics of the asphalt mixture, which can more comprehensively evaluate the deformation and cracking process of the asphalt mixture under load and more accurately evaluate the crack resistance of the asphalt mixture.
[60] Embodiment 2 of the present disclosure provides a system for evaluating crack resistance of an asphalt mixture under an intermediate-temperature condition, including a data acquisition module, a data processing module, a curve calculation module, and an evaluation module.
[61] The data acquisition module is configured to perform an intermediate-temperature splitting test on a specimen, and record the splitting force, vertical displacement of a loading indenter, and a lateral deformation value of the specimen synchronously during the test.
[62] The data processing module is configured to calculate splitting stiffness according to the splitting force, the vertical displacement of the loading indenter, and the lateral deformation value of the specimen.
[63] The curve calculation module is configured to obtain a curve of the splitting stiffness varying with time combined with the splitting stiffness.
[64] The evaluation module is configured to evaluate the crack resistance of the specimen by taking a peak value of the dynamic curve as an index.
[65] Finally, a computer storage medium is provided, a computer program is stored on the computer storage medium, and when the computer program is executed by a processor, steps of the method for evaluating crack resistance of an asphalt mixture under an intermediate-temperature condition are realized.
[66] Each embodiment of this specification is described in a progressive manner, each embodiment focuses on the difference from other embodiments, and the same and similar parts between the embodiments may refer to each other. Since a device disclosed in the embodiments corresponds to a method disclosed in the embodiments, its description is relatively simple, and reference may be made to a partial description of the method for relevant contents.
[67] The above description of the disclosed embodiments enables those skilled in the art to achieve or use the present disclosure. Various modifications to these embodiments are readily apparent to those skilled in the art, and the generic principles defined herein may be practiced in other embodiments without departing from the spirit or scope of the present disclosure. Thus, the present disclosure is not limited to the embodiments shown herein but falls within the widest scope consistent with the principles and novel features disclosed herein.
Claims (6)
- WHAT IS CLAIMED IS: 1. A method for evaluating crack resistance of an asphalt mixture under an intermediate-temperature condition, comprising the following specific steps: performing an intermediate-temperature splitting test on a specimen, and recording a splitting force, a vertical displacement of a loading indenter, and a lateral deformation value of the specimen synchronously during the test; calculating splitting stiffiiess according to the splitting force, the vertical displacement of the loading indenter, and the lateral deformation value of the specimen; combined with the splitting stiffness, obtaining a varying curve of the splitting stiffness with time; and evaluating the crack resistance of the specimen by taking a peak value of the splitting stiffness curve as an index.
- 2. The method for evaluating crack resistance of an asphalt mixture under an intermediate-temperature condition according to claim 1, wherein a calculation formula of the splitting stiffness is: 2F(a1b2-a2b0 KOh(a2L, + b2L) , and S is the splitting stiffitess; F is the splitting force; L-Y is the vertical displacement of the loading indenter; Lx is the lateral deformation value of the specimen; h is a thickness of the specimen; 9 is a width of the loading indenter; and ai, £72, b.?, and b2 are diameter coefficients of the specimen.
- 3. The method for evaluating crack resistance of an asphalt mixture under an intermediate-temperature condition according to claim 1, wherein a greater peak value of the splitting stiffness curve indicates a stronger crack resistance for the asphalt mixture.
- 4. The method for evaluating the intermediate-temperature crack resistance of an asphalt mixture according to claim 1, wherein the intermediate-temperature splitting test is performed at least three times.
- 5. A system for evaluating the intermediate-temperature crack resistance of an asphalt mixture, comprising: a data acquisition module, a data processing module, a curve calculation module, and an evaluation module, wherein the data acquisition module is configured to perform an intermediate-temperature splitting test on a specimen, and record a splitting force, vertical displacement of a loading indenter, and a lateral deformation value of the specimen synchronously during the test; the data processing module is configured to calculate splitting stiffness according to the splitting force, the vertical displacement of the loading indenter, and the lateral deformation value of the specimen; the curve calculation module is configured to obtain a dynamic curve of the splitting stiffness varying with time combined with the splitting stiffness; and the evaluation module is configured to evaluate the crack resistance of the specimen by taking a peak value of the dynamic curve as an index.
- 6. A computer storage medium, wherein a computer program is stored on the computer storage medium, and when the computer program is executed by a processor, steps of the method for evaluating crack resistance of an asphalt mixture under an intermediate-temperature condition according to claims 1 to 4 are realized.
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| CN202111242756.3A CN113865995B (en) | 2021-10-25 | 2021-10-25 | Method and system for evaluating medium-temperature crack resistance of asphalt mixture and storage medium |
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| CN116577221B (en) * | 2023-04-10 | 2024-08-16 | 湖南建工交通建设有限公司 | Asphalt mixture splitting fatigue test method for ensuring first splitting at circle center |
| CN116448591B (en) * | 2023-06-19 | 2023-08-18 | 中南大学 | Asphalt concrete I-type medium-low temperature fracture test method and evaluation method |
| CN117805351B (en) * | 2024-03-01 | 2024-05-03 | 吉林建筑大学 | Comprehensive evaluation method for fatigue resistance of asphalt mixture |
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| CN102841021A (en) * | 2012-09-07 | 2012-12-26 | 郑州大学 | Low-temperature splitting tester for fiber asphalt mixture |
| CN106706422A (en) * | 2016-11-17 | 2017-05-24 | 长沙理工大学 | Synchronous testing method and device for tensile modulus, compressive modulus and split modulus of pavement material |
| CN110174308A (en) * | 2019-06-10 | 2019-08-27 | 交通运输部公路科学研究所 | A kind of synchronous detecting method of asphalt dynamic tensile, compression modulus and Poisson's ratio |
| CN111141602A (en) * | 2019-12-25 | 2020-05-12 | 同济大学 | Method for synchronously determining drawing and pressing mold amount of asphalt mixture by utilizing indirect tensile test |
| CN113188870A (en) * | 2021-05-17 | 2021-07-30 | 北京科技大学 | Testing and evaluating method for rock mechanical heterogeneity |
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| US9234825B2 (en) * | 2011-03-29 | 2016-01-12 | University Of Tennessee Research Foundation | Method and apparatus for fatigue and viscoelastic property testing of asphalt mixtures using a loaded wheel tester |
| KR101669109B1 (en) * | 2015-05-12 | 2016-10-27 | 한국철도기술연구원 | Asphalt pavement structure for railroad track, and construction method for the same |
| CN109580362A (en) * | 2019-01-26 | 2019-04-05 | 长沙理工大学 | A method of evaluation asphalt splitting fatigue performance |
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| CN102841021A (en) * | 2012-09-07 | 2012-12-26 | 郑州大学 | Low-temperature splitting tester for fiber asphalt mixture |
| CN106706422A (en) * | 2016-11-17 | 2017-05-24 | 长沙理工大学 | Synchronous testing method and device for tensile modulus, compressive modulus and split modulus of pavement material |
| CN110174308A (en) * | 2019-06-10 | 2019-08-27 | 交通运输部公路科学研究所 | A kind of synchronous detecting method of asphalt dynamic tensile, compression modulus and Poisson's ratio |
| CN111141602A (en) * | 2019-12-25 | 2020-05-12 | 同济大学 | Method for synchronously determining drawing and pressing mold amount of asphalt mixture by utilizing indirect tensile test |
| CN113188870A (en) * | 2021-05-17 | 2021-07-30 | 北京科技大学 | Testing and evaluating method for rock mechanical heterogeneity |
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| CN113865995A (en) | 2021-12-31 |
| GB202202992D0 (en) | 2022-04-20 |
| CN113865995B (en) | 2022-06-24 |
| GB2612152B (en) | 2023-12-06 |
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