Fiber rubber gravel sealing layer for inhibiting reflection cracks of road surface and optimization design method of fiber rubber gravel sealing layer

Abstract

The invention provides an optimization design method of a fiber rubber gravel seal layer for inhibiting pavement reflection cracks. The optimization design method comprises the following steps: determining optimal fibers; determining an optimal aggregate; preparing a plurality of groups of third test pieces by taking the optimal fiber dosage, the optimal aggregate spreading amount and the optimal rubber asphalt dosage as variables through an orthogonal test; and combining the third test piece with the base layer with the crack and the overlay layer, preparing a fourth test piece, carrying out a reflection crack simulation test, and determining the combination of the material with the optimal crack resistance according to the test result. The method takes the reflection crack resistance of the fiber rubber asphalt macadam seal as a main evaluation index, and has the advantages of scientificity, reasonability and accuracy compared with the prior art. The fiber rubber gravel sealing layer obtained through the design method has excellent reflection crack resistance, the crack resistance of the composite pavement can be remarkably improved, the pavement maintenance and repair cost can be reduced, the pavement service cycle can be prolonged, and the fiber rubber gravel sealing layer has wide popularization and application prospects.

Description

Technical Field

[0001] The present invention belongs to the technical field of optimized design of pavement anti-reflection crack seal coats, and particularly relates to an optimized design method for a fiber-rubber aggregate seal coat for suppressing pavement reflection cracks, and also relates to a fiber-rubber aggregate seal coat for suppressing pavement reflection cracks. Background Art

[0002] Cracks are one of the main diseases of pavements. In order to reduce the reflection cracks of semi-rigid base pavements and the reflection of cracks from old pavements to the overlay during overlay construction, stress-absorbing layers are often set in the pavement structure, and among them, the aggregate seal coat is the most commonly used stress-absorbing layer. The traditional aggregate seal coat is mainly composed of asphalt and aggregates. When designing the proportion, the amounts of asphalt and aggregates are mainly determined according to experience, or by the Mcleod theory method, that is, assuming that the aggregate coverage rate is 100%, and the asphalt binder fills 70% of the average height of the aggregates.

[0003] However, neither of these two methods takes into account the anti-reflection crack ability of the aggregate seal coat during the design process, and is greatly affected by subjective factors. The anti-reflection crack ability of the aggregate seal coat generally refers to the speed at which cracks expand from the bottom to the surface under the repeated action of vehicle loads. The slower the expansion, the better the anti-crack performance. Although in some studies, in order to increase the anti-reflection crack ability of the aggregate seal coat, the method of adding rubber-modified asphalt and a certain proportion of fibers to the pavement is adopted, but how to determine the amount of fibers is not reasonably considered in the traditional design.

[0004] Based on this, how to scientifically, accurately and reasonably design a seal coat structure with good anti-reflection crack performance not only has important significance for reducing pavement maintenance and repair costs and extending the pavement service life, but also is a technical problem that needs to be solved urgently. Summary of the Invention

[0005] One of the purposes of the present invention is to provide an optimized design method for a fiber-rubber aggregate seal coat for suppressing pavement reflection cracks.

[0006] Another purpose of the present invention is to provide a fiber-rubber aggregate seal coat for suppressing pavement reflection cracks.

[0007] The technical solution adopted by the present invention to achieve the first purpose is: to provide an optimized design method for a fiber-rubber aggregate seal coat for suppressing pavement reflection cracks, including the following steps:

[0008] S1. Combine different fibers with rubber asphalt respectively to prepare multiple groups of first specimens, conduct tensile tests on the first specimens respectively, and obtain force-elongation curves; determine the optimal fiber according to the force-elongation curves;

[0009] S2. Bond the rubber asphalt to the surfaces of different types of aggregates after pretreatment to obtain multiple groups of second specimens, conduct pull-out tests on the second specimens respectively, and obtain the pull-out strength; determine the optimal aggregate according to the test results of the pull-out strength.

[0010] S3. Take the dosage of the optimal fiber, the spreading amount of the optimal aggregate, and the dosage of the rubber asphalt as variables, conduct an orthogonal test, and prepare multiple groups of third specimens.

[0011] S4. Form a fourth specimen in the stacking order from bottom to top as the base course with cracks, the third specimen, and the overlay; place the fourth specimen in the reflection crack simulation device, and test the number of fatigue actions corresponding to when the fourth specimen is completely cracked; according to the test results, determine the combination of the optimal anti-cracking performance materials for the fiber-rubber chip seal.

[0012] Further, in step S1, determining the optimal fiber according to the force-measuring ductility curve includes: according to the peak tensile force F max and the strain yield energy W of the force-measuring ductility curve, determine the type and length of the optimal fiber.

[0013] Further, in step S2, the pretreatment of the aggregate includes: grinding, cleaning, and drying the aggregate, and then placing it under the condition of 140 - 180 °C for heat preservation treatment.

[0014] Further, in step S2, determining the optimal aggregate according to the test results of the pull-out strength includes: according to the test results of the pull-out strength of the second specimen, select the aggregate corresponding to the maximum pull-out strength as the optimal aggregate.

[0015] Further, in step S3, the dosage of the optimal fiber is 60 - 120 g / m 2 , the spreading amount of the optimal aggregate is 12 - 18 kg / m 2 , and the dosage of the rubber asphalt is 1.8 - 2.4 kg / m 2 . In the present invention, the dosage of the optimal fiber, the spreading amount of the optimal aggregate, and the dosage of the rubber asphalt are all added based on the area of the road surface.

[0016] Further, the base course with cracks uses an old asphalt pavement, the crack width is 1 - 5 mm; the overlay uses an asphalt mixture; in the fourth specimen, the thickness ratio of the base course with cracks, the third specimen, and the overlay is (3 - 8):1:(3 - 8).

[0017] Further, in step S4, the reflection crack simulation device includes: a steel mold with a groove and a loading device, and a buffer pad is laid at the bottom of the groove of the steel mold. Preferably, the buffer pad is selected from rubber pads, and its thickness is 2 - 3 cm. In the present invention, the setting of the buffer pad can reduce the friction between the specimen and the steel film, enabling the specimen to undergo lateral deformation under the action of the load.

[0018] Further, in step S4, the method for testing the number of fatigue actions corresponding to the complete cracking of the fourth specimen includes: placing the fourth specimen above the buffer pad in the steel mold, and applying a load on the top of the fourth specimen; observing the development of cracks during the test process and recording the number of fatigue actions corresponding to the complete cracking of the fourth specimen.

[0019] Preferably, during the process of applying the load, the loading waveform is a half - wave sine, the loading frequency is 5 - 25 Hz, and the peak value of the applied load is 2 - 4 KN.

[0020] The technical solution adopted by the present invention to achieve the second object is: to provide a fiber - rubber - aggregate seal coat for suppressing pavement reflection cracks, and the fiber - rubber - aggregate seal coat is prepared by the optimized design method according to the first object of the present invention.

[0021] Further, the composition of the fiber - rubber - aggregate seal coat includes fibers, aggregates, and rubber asphalt. The fibers are selected from basalt fibers with a length of 7.5 cm; the aggregates are selected from basalt gravel.

[0022] Preferably, the dosage of the fibers is 80 - 120 g / m 2 , the dosage of the gravel is 12 - 18 kg / m 2 , and the dosage of the rubber asphalt is 1.8 - 2.4 kg / m 2 . Under this proportion condition, the number of fatigue actions corresponding to the complete cracking of the fourth specimen is more than 12,000 times.

[0023] More preferably, the dosage of the fibers is 100 - 120 g / m 2 , the dosage of the gravel is 14 - 16 kg / m 2 , and the dosage of the rubber asphalt is 2.2 - 2.4 kg / m 2 . Under this proportion condition, the number of fatigue actions corresponding to the complete cracking of the fourth specimen is more than 15,000 times.

[0024] Compared with the prior art, the beneficial effects of the present invention are:

[0025] (1) The present invention provides an optimization design method for a fiber rubber chip seal that suppresses reflective cracks in a road surface. The method uses the anti-reflective cracking ability of the fiber rubber asphalt chip seal itself as the main evaluation index. The fiber is first optimized and selected using a force ductility test, and the aggregate is optimized and selected using a pull-out strength test to determine the best raw material. Furthermore, the amount of the best raw material is used as a variable to conduct an orthogonal test to prepare multiple groups of test pieces, and a reflective crack simulation device is used to test the number of fatigue actions corresponding to the complete cracking of the test pieces. Based on the test results, the combination of materials with the best crack resistance of the fiber rubber chip seal is determined. The present invention screens multiple factors that affect the crack resistance of the fiber rubber chip seal, determines them in a hierarchical manner, and comprehensively evaluates them. Compared with previous technologies, this evaluation method has the advantages of scientificity, rationality, and accuracy.

[0026] (2) The fiber-rubber chip seal for suppressing pavement reflective cracks provided by the present invention. According to the test, under the conditions of a half-wave sine loading waveform, a loading frequency of 10 Hz, and an applied load peak of 4 KN, the number of fatigue actions corresponding to the complete cracking of the specimen is more than 7,000 times, and the maximum can reach 19,532 times. It has excellent anti-reflective cracking ability and can significantly improve the crack resistance of the composite pavement. The fiber-rubber chip seal for suppressing pavement reflective cracks provided by the present invention and the design method thereof can reduce the cost of pavement maintenance and repair, extend the pavement service life, and have broad prospects for promotion and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A schematic flow chart of an optimization design method for a fiber rubber chip seal for suppressing reflective cracks on a pavement provided by an embodiment of the present invention;

[0028] Figure 2 It is a force-ductility curve diagram in an embodiment of the present invention;

[0029] Figure 3 This is a physical picture of the force-ductility test piece in the embodiment of the present invention;

[0030] Figure 4 This is a test diagram of a force-ductility test piece in an embodiment of the present invention;

[0031] Figure 5 This is a force-ductility diagram of glass fiber / rubber asphalt in an embodiment of the present invention;

[0032] Figure 6 This is a force-ductility diagram of basalt fiber / rubber asphalt in an embodiment of the present invention;

[0033] Figure 7 This is a force-ductility diagram of alkali-free glass fiber / rubber asphalt in an embodiment of the present invention;

[0034] Figure 8It is the drawing of the drawing strength test in the embodiment of the present invention;

[0035] Figure 9 It is the physical drawing of the fourth test piece of the three - layer structure in the embodiment of the present invention;

[0036] Figure 10 It is the structural schematic diagram of the reflection crack simulation device in the embodiment of the present invention;

[0037] Figure 11 It is the drawing of the fatigue crack resistance test in the embodiment of the present invention;

[0038] Figure 12 It is the drawing of the influence of fiber dosage on crack resistance performance in the embodiment of the present invention;

[0039] Figure 13 It is the drawing of the influence of crushed stone dosage on crack resistance performance in the embodiment of the present invention;

[0040] Figure 14 It is the drawing of the influence of rubber asphalt dosage on crack resistance performance in the embodiment of the present invention. Detailed implementation manners

[0041] Next, the technical solutions of the present invention will be clearly and completely described in conjunction with the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts belong to the scope of protection of the present invention.

[0042] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other.

[0043] As Figure 1 shown, the present invention provides an optimized design method for a fiber - rubber - crushed stone seal coat for suppressing pavement reflection cracks, and the method includes the following steps:

[0044] Step 1: Determine the type and length of the optimal fiber:

[0045] Combine fibers of different types and lengths with rubber asphalt respectively to prepare multiple groups of first test pieces, and conduct tensile tests on the first test pieces respectively to obtain the force - elongation curves, as Figure 2 shown; according to the peak tensile force F max and the strain yield energy W of the force - elongation curve, determine the type and length of the optimal fiber.

[0046] In the present invention, three types of fibers suitable for the road stress absorption layer are selected, including glass fiber, basalt fiber, and alkali - free glass fiber, and the fiber lengths are 0 cm, 3 cm, 6 cm, and 7.5 cm respectively.

[0047] AsFigure 3 As shown, force-measuring ductility specimens are made from fibers of different types and lengths. First, half of the volume of the test mold is poured. Then, using tweezers, three types of fibers are evenly placed on the asphalt respectively. The fiber mass is 5% of the asphalt mass, and the fiber lengths are 0 cm, 3 cm, 6 cm, and 7.5 cm. Then, the asphalt is poured for the second time and is slightly higher than the test mold. After cooling, it is leveled with a spatula. Finally, the specimen is immersed in a water bath at 5°C for heat preservation for 1 - 1.5 h to obtain the first specimen.

[0048] As Figure 4 shown, the specimen is installed in the force-measuring ductility instrument, and the instrument is started for testing. The stretching rate is 5 cm / min to obtain the stress and ductility curves of the fiber asphalt stretching, as Figures 5 - 7 shown. Figures 5 - 7 Among them, XJ represents rubber asphalt, B represents glass fiber, X represents basalt fiber, W represents alkali-free glass fiber; 3, 6, and 7.5 represent fiber lengths.

[0049] According to Figures 5 - 7 the performance test curve, the maximum tensile force F max , the maximum elongation D max and the strain yield energy W are calculated. The results are shown in Table 1 below:

[0050] Table 1

[0051]

[0052] As can be seen from Table 1 above,

[0053] by comparing the magnitudes of F max and W, the type of fiber is determined to be basalt fiber with a length of 7.5 cm.

[0054] Step 2: Determine the type of the best aggregate:

[0055] Bond the rubber asphalt to the surfaces of different types of aggregates after pretreatment to obtain multiple groups of second specimens. Conduct pull-out tests on the second specimens respectively to obtain the pull-out strength; determine the type of the best aggregate according to the pull-out strength test results;

[0056] Four different types of aggregates, namely basalt, granite, sandstone, and diabase, are selected in the present invention. The method for pretreating the aggregates includes: first, grinding and smoothing the surface of the aggregates; then, rinsing the polished aggregates with clean water and putting them into an oven for heat preservation at 160°C for two hours; weighing 0.0314 g of rubber asphalt; placing the asphalt on the surface of the heated rock block and gently pressing with a pull-out head to bond the two together; after cooling to room temperature of 20°C, the PosiTest fully automatic pull-out adhesion tester can be used to start the pull-out test. As Figure 8 shown, the pull-out strength at the time of failure is measured and is shown in Table 2 below:

[0057] Table 2

[0058] Basalt Granite Sandstone Diabase Pull - out strength / MPa 1.27 0.71 0.85 1.18

[0059] As can be seen from Table 2 above,

[0060] By comparing the drawing strengths, the best aggregate type (i.e., the type of crushed stone) is determined to be basalt.

[0061] Step 3: Design an orthogonal experiment

[0062] Taking the dosage of fiber, the spreading amount of crushed stone, and the dosage of rubber asphalt as variables, conduct an orthogonal experiment to prepare multiple groups of third specimens; in the present invention, the selected range of fiber dosage is 60 - 120 g / m 2 , the spreading amount of crushed stone with a particle size of 5 - 10 mm is 12 - 18 kg / m 2 , and the rubber asphalt is 1.8 - 2.4 kg / m 2 . Four levels are selected for each influencing factor, and the design is carried out according to the orthogonal experiment table of L16(45), as shown in Table 3 below:

[0063] Table 3

[0064]

[0065] Step 4: Simulation test

[0066] According to the stacking order from bottom to top as the base layer with cracks, the third specimen, and the overlay layer, form a fourth specimen, and the structure of the fourth specimen is as Figure 9 shown. As Figure 10 shown, place the fourth specimen in the reflection crack simulation device, and test the number of fatigue action times corresponding to when the fourth specimen is completely cracked; according to the test results, further determine the combination of the best crack-resistant performance materials for the fiber-rubber-crushed stone seal layer.

[0067] The present invention will be further described below in conjunction with specific embodiments, but it is not limited to the present invention.

[0068] The fiber dosages, crushed stone dosages, and rubber asphalt dosages adopted in Embodiments 1 - 16 of the present invention are as shown in Table 4 below.

[0069] Table 4

[0070]

[0071]

[0072] In the above table,

[0073] The fiber is basalt fiber with a length of 7.5 cm, a single filament tensile strength of 4.53 GPa, an elastic modulus of 62.6 GPa, and an elongation at break of 1.70%; the crushed stone is basalt with a particle size of 4.75 - 9.5 mm, an apparent density of 2.928 g / cm 3 , a water absorption rate of 0.54%, a crushing value of 8.5%, and a Los Angeles abrasion value of 6.6%; the rubber asphalt is prepared by adding 20% of 40 - mesh rubber powder to 90# base asphalt, with a penetration at 25°C of 5.2 mm and a softening point of 59°C.

[0074] Example 1

[0075] This example provides a fiber - rubber asphalt crushed stone seal coat, and its composition raw materials by weight include 0.06 parts of fiber, 12 parts of crushed stone, and 1.8 parts of rubber asphalt.

[0076] The preparation method of the fiber - rubber asphalt crushed stone seal coat is as follows: Adopt a layered spreading method, that is, spread one layer of rubber asphalt + one layer of fiber + one layer of rubber asphalt + one layer of crushed stone in sequence. During the preparation process, try to ensure the uniformity of the spreading of fiber, asphalt, and crushed stone, and finally roll it compactly to obtain the fiber - rubber asphalt crushed stone seal coat.

[0077] Examples 2 - 15

[0078] The differences between Examples 2 - 15 and Example 1 are that the raw material dosages in Example 1 are adjusted according to the fiber dosage, crushed stone dosage, and rubber asphalt dosage shown in Table 4, and the remaining steps remain unchanged to obtain the fiber - rubber asphalt crushed stone seal coat.

[0079] Performance test

[0080] Take the fiber - rubber asphalt crushed stone seal coats prepared in Examples 1 - 16 as the third specimens, and according to the stacking order from bottom to top as the base layer with cracks, the third specimens, and the overlay layer, form the fourth specimen. The structure of the fourth specimen is as Figure 9 shown. Place the fourth specimen in the reflection crack simulation device and test the number of fatigue actions corresponding to when the fourth specimen is completely cracked.

[0081] Figure 10Schematic diagram of the structure of the reflective crack simulation device adopted by the present invention. The device is a U-shaped steel mold, and a rubber pad is placed at the bottom inside the steel mold. The size of the rubber pad is 26 cm × 7 cm × 2.5 cm. The base layer with cracks, the third specimen, and the overlay are stacked in sequence from bottom to top. Among them, the base layer with cracks uses a road surface with a thickness of 4 cm, the road surface cracks vertically, and the crack width is 3 mm; the third specimen (fiber rubber asphalt chip seal) prepared by the present invention is placed above the base layer with cracks, and its thickness is 1 cm; above the third specimen is the overlay, and the overlay uses asphalt mixture, and its size is 24 cm × 7 cm × 3 cm.

[0082] After the above specimens are prepared, first put the specimens into the incubator of the universal testing machine for 1 h at a temperature of 15 °C, and then immediately put them into the mold to start the test. As Figure 11 shown, during the test, a strip load is applied along the width direction on the top surface of the asphalt concrete. The loading area is 4 cm × 7 cm (the present invention uses a steel bar of 7 cm × 4 cm × 2 cm). The loading waveform is a half-wave sine wave, the loading frequency is 10 Hz, and the peak value of the applied load is 4 KN. Observe the development of cracks during the test process, record the number of fatigue actions corresponding to when the specimen is completely cracked. During the test process, there are at least two specimens for parallel tests. If the results of the two specimens vary greatly, then make up a group, and take the average value of the two with relatively close values as the final result. The anti-cracking performance test results (fatigue times) of Examples 1-16 are shown in Table 5 below.

[0083] Table 5

[0084]

[0085]

[0086] Furthermore, perform range analysis on the test results in Table 5. As Figure 12 、 13 and 14 shown, the best anti-cracking performance material combination is obtained.

[0087] It can be known from the previous test results that:

[0088] Under the conditions of a half-wave sine loading waveform, a loading frequency of 10 Hz, and a peak value of the applied load of 4 KN, the present invention combines basalt fiber, basalt gravel, and rubber asphalt to prepare a fiber rubber gravel chip seal, and the number of fatigue actions corresponding to when the specimen is completely cracked can reach more than 7000 times.

[0089] In addition, by comparing the above results, it can be known that: the amount of fiber used, the spreading amount of gravel, and the amount of rubber asphalt used have an important influence on the number of fatigue actions corresponding to when the specimen is completely cracked: when the amount of fiber used is 80-120 g / m 2, the dosage of crushed stone is 12 - 18 kg / m 2 , the dosage of rubber asphalt is 1.8 - 2.4 kg / m 2 , when the dosage of fiber is 100 - 120 g / m 2 , the dosage of crushed stone is 14 - 16 kg / m 2 , the dosage of rubber asphalt is 2.2 - 2.4 kg / m 2 , the number of fatigue action times corresponding to the complete cracking of the fourth specimen is more than 12,000 times; further, when the dosage of fiber is 100 - 120 g / m

[0090] Among them, the best anti-cracking performance material combination obtained by the optimization design is A4B2C4, that is, the fiber dosage is 120 g / m 2 , the crushed stone dosage is 14 kg / m 2 , the rubber asphalt dosage is 2.4 kg / m 2 . Under this condition, the number of fatigue action times corresponding to the complete cracking of the fourth specimen is as high as 19,532 times, and the improvement effect of the anti-cracking performance is significant.

[0091] In summary, the present invention provides an optimization design method for a fiber-rubber crushed stone seal coat for suppressing pavement reflection cracks. This method takes the anti-reflection crack ability of the fiber-rubber asphalt crushed stone seal coat itself as the main evaluation index, screens multiple factors affecting the anti-cracking performance of the fiber-rubber crushed stone seal coat, determines and comprehensively evaluates them hierarchically. This evaluation method has the advantages of scientificity, rationality, and accuracy compared with the prior art. The fiber-rubber crushed stone seal coat obtained by this design method has excellent anti-reflection crack ability, can significantly improve the anti-cracking performance of the composite pavement, reduce the pavement maintenance and repair costs, extend the pavement service life, and has broad promotion and application prospects.

[0092] The above is only a preferred embodiment of the present invention, and does not limit the implementation mode and protection scope of the present invention. For those skilled in the art, it should be able to realize that all equivalent replacements and obvious changes made by using the content of the present invention specification should be included in the protection scope of the present invention.

Claims

1. An optimized design method for a fiber-rubber chip seal layer that inhibits pavement reflective cracks, characterized in that, It includes the following steps: S1. Combine different fibers with rubber asphalt respectively to prepare multiple groups of first specimens, conduct tensile tests on the first specimens respectively, and obtain force-elongation curves; determine the optimal fiber according to the force-elongation curves; S2. Bond the rubber asphalt on the surfaces of different types of aggregates after pretreatment to obtain multiple groups of second specimens, conduct pull-out tests on the second specimens respectively, and obtain the pull-out strength; Determine the optimal aggregate according to the pull-out strength test results; S3. Use the dosage of the optimal fiber, the spreading amount of the optimal aggregate, and the dosage of the rubber asphalt as variables to conduct an orthogonal test and prepare multiple groups of third specimens; S4. Form a fourth specimen according to the stacking order from bottom to top as the base course with cracks, the third specimen, and the overlay; place the fourth specimen in a reflection crack simulation device and test the fatigue action times corresponding to when the fourth specimen is completely cracked; According to the test results, determine the combination of the optimal crack-resistant performance materials for the fiber-rubber chip seal; 2. The optimization design method according to claim 1, wherein In step S1, determining the optimal fiber according to the force-measured ductility curve includes: determining the peak tensile force F of the force-measured ductility curve max and the strain yield energy W to determine the type and length of the optimal fiber.

3. The optimization design method according to claim 1, characterized in that In step S2, the pretreatment of the aggregate includes: grinding, cleaning, and drying the aggregate, and then carrying out heat preservation treatment at 140-180°C; 4. The optimization design method according to claim 1, characterized in that In step S2, determining the optimal aggregate according to the pull-out strength test results includes: according to the pull-out strength test results of the second specimens, select the aggregate corresponding to the maximum pull-out strength as the optimal aggregate; 5. The optimization design method according to claim 1, wherein The optimal fiber is selected from basalt fibers with a length of 7.5 cm, and the optimal aggregate is selected from basalt chips; 6. The optimization design method according to claim 1, wherein In step S4, the base course with cracks uses an old asphalt pavement, and the crack width is 1-5 mm; the overlay uses an asphalt mixture; in the fourth specimen, the thickness ratio of the base course with cracks, the third specimen, and the overlay is (3-8):1:(3-8); 7. The optimization design method according to claim 1, characterized in that In step S4, the reflection crack simulation device includes: a steel mold with a groove and a loading device, and a buffer pad is laid at the bottom of the groove of the steel mold; 8. The optimization design method according to claim 7, characterized in that In step S4, the method for testing the fatigue action times corresponding to when the fourth specimen is completely cracked includes: placing the fourth specimen above the buffer pad in the steel mold and applying a load on the top of the fourth specimen; observe the development of cracks during the test process and record the fatigue action times corresponding to when the fourth specimen is completely cracked; 9. A fiber rubber chip seal for suppressing pavement reflection cracks, characterized in that, The fiber-rubber chip seal is prepared by the optimization design method according to any one of claims 1-8; 10. The fiber rubber chip seal according to claim 9, characterized in that, The fiber-rubber chip seal is composed of fibers, aggregates, and rubber asphalt; The fibers are selected from basalt fibers with a length of 7.5 cm; the aggregates are selected from basalt chips; The dosage of the fiber is 80 to 120 g / m 2 , the dosage of the basalt gravel is 12 to 18 kg / m 2 , the dosage of the rubber asphalt is 1.8 to 2.4 kg / m 2 .

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