Preparation method of skeleton-embedded compact asphalt mixture

Abstract

The invention relates to a preparation method of a skeleton embedded compact asphalt mixture, and belongs to the technical field of asphalt mixture preparation. Putting the preheated coarse aggregate and fine aggregate into stirring equipment, carrying out dry mixing, then adding the modified asphalt, carrying out wet mixing, finally adding the modified filler, and continuously carrying out wet mixing, so as to obtain an asphalt mixture; loading the asphalt mixture into a test mold, adopting a double-sided static pressure molding process, performing static pressure, cooling and demolding to obtain a skeleton-embedded compact asphalt mixture; the modified filler is prepared from limestone mineral powder, gamma-methacryloxy propyl trimethoxy silane, 8-anilino-1-naphthalene sulfonic acid magnesium salt, absolute ethyl alcohol and sodium perethoxide; the Marshall stability, the low-temperature bending strain and the freeze-thaw splitting strength ratio of the prepared asphalt mixture are remarkably improved, and the asphalt mixture can effectively resist high-temperature rutting, low-temperature cracking and water damage.

Description

Technical Field

[0001] This invention relates to the field of asphalt mixture preparation technology, and in particular to a method for preparing a skeleton-interlocked compacted asphalt mixture. Background Technology

[0002] Asphalt mixture is a core material for highway pavement construction, and its performance directly determines the quality and lifespan of the pavement. With the continuous increase in traffic volume and the rise in the proportion of heavy-duty vehicles, traditional dense-graded asphalt mixtures are gradually revealing problems such as high-temperature rutting, low-temperature cracking, and severe water damage. Chinese Patent CN119956645A: Provides a method for preparing asphalt mixture for road surfaces, including: material selection: selecting coarse aggregate, fine aggregate, filler, and asphalt that meet the requirements of the "Technical Specification for Construction of Asphalt Pavement of Highway" (JTGF40-2004); batching: weighing and mixing coarse aggregate, fine aggregate, filler, and asphalt according to the construction mix ratio; mixing of asphalt mixture: mixing steel slag asphalt mixture evenly, the mixing time of asphalt mixture should not be less than 45s, of which the dry mixing time should not be less than 5-10s and the wet mixing time should not be less than 40s; and transportation of asphalt mixture.

[0003] Chinese Patent CN1152591A discloses a low-temperature asphalt mixture and its preparation method, belonging to the field of asphalt treatment technology for construction. The low-temperature mixture consists of asphalt, asphalt diluent, additives, and aggregates. The asphalt diluent is selected from RQ70# solvent oil, RM55 solvent oil, or RC-10 light oil; the additive is vegetable oil. The preparation method is as follows: first, the asphalt is diluted with solvent oil, and then mixed with aggregates.

[0004] In existing technologies, improving the performance of asphalt mixtures often starts with modifying raw materials or optimizing gradation. Some methods increase the strength of the mixture by adding admixtures such as fibers and anti-rutting agents, but the addition of admixtures increases costs and may lead to a decrease in the workability of the mixture. Another method uses a skeleton-porosity gradation, which can improve high-temperature stability, but the excessive porosity makes it easy for water to enter and cause water damage, while also reducing durability. Summary of the Invention

[0005] To address the aforementioned problems, this invention provides a method for preparing a skeleton-interlocked compacted asphalt mixture, the operation steps of which are as follows, in parts by weight: S1: Preheat 60-75 parts of coarse aggregate and 20-30 parts of fine aggregate to 170-180℃, preheat 3-6 parts of filler to 160-170℃, and heat 4.2-5.0 parts of modified asphalt to 165-175℃; first, put the preheated coarse aggregate and fine aggregate into the mixing equipment and dry mix for 30-45 seconds, then add the modified asphalt and wet mix for 45-60 seconds, and finally add the modified filler and continue to wet mix for 30-40 seconds to obtain the asphalt mixture; S2: The asphalt mixture is loaded into a test mold and statically pressed at 160-170℃ using a double-sided static pressing process. After cooling and demolding, a skeleton-interlocked dense asphalt mixture is obtained.

[0006] In some embodiments, the coarse aggregate is basalt, with a particle size distribution of 25-30% for 19-31.5mm, 30-35% for 13.2-19mm, and 35-40% for 9.5-13.2mm.

[0007] In some embodiments, the fine aggregate is limestone with a particle size of 2-5 mm.

[0008] In some embodiments, the modified asphalt is SBS modified asphalt.

[0009] In some embodiments, step S1 uses a stepwise filling method to adjust the gradation so that the asphalt mixture forms key points of skeleton interlocking at particle sizes of 16-19mm and 9.5-13.2mm, with the 0.075mm passing rate controlled at 3-5% and the 4.75mm passing rate controlled at 20-25%.

[0010] In some embodiments, the stirring rate of the S1 stirring device is 40-50 r / min.

[0011] In some embodiments, the S2 double-sided static pressure forming process steps are as follows: first, pressurize to 2-3 MPa, static pressure for 10-15 seconds, then pressurize to 4-5 MPa, static pressure for 20-25 seconds.

[0012] In some embodiments, the method for preparing the modified filler is as follows: 70-100 parts of limestone mineral powder, 2-4 parts of γ-methacryloxypropyltrimethoxysilane, 3-6 parts of magnesium salt of 8-aniline-1-naphthalenesulfonate, 600-900 parts of anhydrous ethanol, and 0.2-0.4 parts of sodium perethanol were mixed, heated and reacted, and then filtered, washed, and dried to obtain the modified filler.

[0013] In some embodiments, the temperature of the heating reaction is 70-80°C and the time is 3-6 hours.

[0014] In some embodiments, the drying temperature is 100-120°C and the drying time is 5-10 hours.

[0015] Reaction mechanism: 1. The "bridge" function of modified fillers at the interface In the preparation of modified fillers, silane coupling agents first react with solvents to generate active substances, which then combine and fix with the surface of limestone mineral powder. One end of the coupling agent is connected to the mineral powder, and the other end is connected to the elastomers and hydrocarbon components in the modified asphalt, which is equivalent to building a "bridge" between inorganic mineral powder and organic asphalt, eliminating the compatibility differences between the two and preventing separation.

[0016] 2. Dispersion of modified fillers and reinforcement of the skeleton Magnesium 8-aniline-1-naphthalenesulfonate prevents mineral powder agglomeration and helps it disperse evenly, while also enhancing the bond between filler and asphalt. Combined with the stepwise filling method to control key particle size, coarse aggregate first forms the main skeleton, and fine aggregate and modified filler fill the gaps in sequence to form a layered structure and strengthen the skeleton of the mixture.

[0017] Technical effects: The present invention provides a method for preparing a skeleton-interlocked compacted asphalt mixture. Compared with the prior art, the present invention has the following significant advantages: 1. This invention improves the compatibility between inorganic mineral powder and organic asphalt by grafting limestone powder onto the interface using a silane coupling agent in the modified filler, reducing the risk of interface separation. Simultaneously, the dispersing effect of magnesium 8-aniline-1-naphthalenesulfonate prevents mineral powder agglomeration, ensuring its uniform distribution within the asphalt matrix. Combined with a stepwise filling method to optimize the gradation of key particle sizes (16-19mm and 9.5-13.2mm), coarse aggregate preferentially forms a stable main skeleton, while fine aggregate and modified filler orderly fill the gaps, creating a "interlocking-compact" dual structure. This structure effectively restricts the relative displacement of aggregate particles under high-temperature conditions, significantly improving the asphalt mixture's resistance to permanent deformation under heavy loads and significantly reducing the probability of rutting, shoving, and other road defects during use.

[0018] 2. The asphalt mixture prepared by this invention has significantly improved Marshall stability, low-temperature flexural strain, and freeze-thaw splitting strength ratio, and can effectively resist high-temperature rutting, low-temperature cracking and water damage. Detailed Implementation

[0019] To further illustrate the technical means and effects adopted by the present invention in order to achieve the intended purpose, the following embodiments and comparative examples are provided in detail: Marshall stability, low-temperature flexural strain, and freeze-thaw splitting strength were tested in accordance with the "Test Procedures for Asphalt and Asphalt Mixtures in Highway Engineering" JTGE20-2011. Example 1 A method for preparing a skeleton-interlocked compacted asphalt mixture, comprising the following steps: S1: Preheat 60g of coarse aggregate and 20g of fine aggregate to 170℃, preheat 3g of filler to 160℃, and heat 4.2g of modified asphalt to 165℃; first, put the preheated coarse aggregate and fine aggregate into the mixing equipment and dry mix for 30s, then add the modified asphalt and wet mix for 45s, and finally add the modified filler and continue to wet mix for 30s to obtain the asphalt mixture; S2: The asphalt mixture is loaded into a test mold, and after static pressing at 160℃ using a double-sided static pressing process, it is cooled and demolded to obtain a skeleton-interlocked dense asphalt mixture.

[0020] The coarse aggregate is basalt, with a particle size distribution of 25% for 19mm, 30% for 13.2mm, and 35% for 9.5mm.

[0021] The fine aggregate is limestone with a particle size of 2mm.

[0022] The modified asphalt mentioned is SBS modified asphalt.

[0023] The S1 step uses a stepwise filling method to adjust the gradation so that the asphalt mixture forms key points of skeleton interlocking at particle sizes of 19mm and 13.2mm, with the 0.075mm pass rate controlled at 3% and the 4.75mm pass rate controlled at 20%.

[0024] The stirring rate of the S1 stirring device is 40 r / min.

[0025] The S2 double-sided static pressure forming process steps are as follows: first, increase the pressure to 2MPa, static pressure for 10s, then increase the pressure to 4MPa, static pressure for 20s.

[0026] The method for preparing the modified filler is as follows: 70g of limestone powder, 2g of γ-methacryloxypropyltrimethoxysilane, 3g of magnesium salt of 8-aniline-1-naphthalenesulfonate, 600g of anhydrous ethanol, and 0.2g of sodium perethanol were mixed, heated and reacted, and then filtered, washed, and dried to obtain the modified filler.

[0027] The heating reaction was carried out at a temperature of 70°C for 3 hours.

[0028] The drying temperature is 100℃ and the time is 5 hours.

[0029] Example 2 A method for preparing a skeleton-interlocked compacted asphalt mixture, comprising the following steps: S1: Preheat 65g of coarse aggregate and 24g of fine aggregate to 175℃, preheat 4g of filler to 165℃, and heat 4.4g of modified asphalt to 170℃; first, put the preheated coarse aggregate and fine aggregate into the mixing equipment and dry mix for 35s, then add the modified asphalt and wet mix for 50s, and finally add the modified filler and continue to wet mix for 35s to obtain the asphalt mixture; S2: The asphalt mixture is loaded into a test mold, and after static pressing at 165℃ using a double-sided static pressing process, it is cooled and demolded to obtain a skeleton-interlocked dense asphalt mixture.

[0030] The coarse aggregate is basalt, with a particle size distribution of 26% for 28mm, 31% for 18mm, and 36% for 12mm.

[0031] The fine aggregate is limestone with a particle size of 3mm.

[0032] The modified asphalt mentioned is SBS modified asphalt.

[0033] The S1 method uses a stepwise filling method to adjust the gradation so that the asphalt mixture forms key points of skeleton interlocking at particle sizes of 18mm and 12mm, and the 0.075mm passing rate is controlled at 4% and the 4.75mm passing rate is controlled at 21%.

[0034] The stirring rate of the S1 stirring device is 45 r / min.

[0035] The S2 double-sided static pressure forming process steps are as follows: first, increase the pressure to 2MPa, static pressure for 10s, then increase the pressure to 4MPa, static pressure for 20s.

[0036] The method for preparing the modified filler is as follows: 80g of limestone powder, 3g of γ-methacryloxypropyltrimethoxysilane, 4g of magnesium salt of 8-aniline-1-naphthalenesulfonate, 700g of anhydrous ethanol and 0.3g of sodium perethanol were mixed, heated and reacted, and then filtered, washed and dried to obtain the modified filler.

[0037] The heating reaction was carried out at a temperature of 75°C for 4 hours.

[0038] The drying temperature is 105℃ and the time is 6 hours.

[0039] Example 3 A method for preparing a skeleton-interlocked compacted asphalt mixture, comprising the following steps: S1: Preheat 70g of coarse aggregate and 28g of fine aggregate to 175℃, preheat 5g of filler to 165℃, and heat 4.8g of modified asphalt to 170℃; first, put the preheated coarse aggregate and fine aggregate into the mixing equipment and dry mix for 40s, then add the modified asphalt and wet mix for 55s, and finally add the modified filler and continue to wet mix for 35s to obtain the asphalt mixture; S2: The asphalt mixture is loaded into a test mold, and after static pressing at 165℃ using a double-sided static pressing process, it is cooled and demolded to obtain a skeleton-interlocked dense asphalt mixture.

[0040] The coarse aggregate is basalt, with a particle size distribution of 23mm (28%), 17mm (34%), and 11mm (38%).

[0041] The fine aggregate is limestone with a particle size of 4 mm.

[0042] The modified asphalt mentioned is SBS modified asphalt.

[0043] The S1 step uses a stepwise filling method to adjust the gradation so that the asphalt mixture forms key points of skeleton interlocking at particle sizes of 17mm and 11mm, and the 0.075mm passing rate is controlled at 4% and the 4.75mm passing rate is controlled at 24%.

[0044] The stirring rate of the S1 stirring device is 45 r / min.

[0045] The S2 double-sided static pressure forming process steps are as follows: first, increase the pressure to 3MPa, static pressure for 15s, then increase the pressure to 5MPa, static pressure for 25s.

[0046] The method for preparing the modified filler is as follows: 90g of limestone powder, 3g of γ-methacryloxypropyltrimethoxysilane, 5g of magnesium salt of 8-aniline-1-naphthalenesulfonate, 800g of anhydrous ethanol, and 0.3g of sodium perethanol were mixed, heated and reacted, and then filtered, washed, and dried to obtain the modified filler.

[0047] The heating reaction was carried out at a temperature of 75°C for 5 hours.

[0048] The drying temperature is 115℃ and the drying time is 8 hours.

[0049] Example 4 A method for preparing a skeleton-interlocked compacted asphalt mixture, comprising the following steps: S1: Preheat 75g of coarse aggregate and 30g of fine aggregate to 180℃, preheat 6g of filler to 170℃, and heat 5.0g of modified asphalt to 175℃; first, put the preheated coarse aggregate and fine aggregate into the mixing equipment and dry mix for 45s, then add the modified asphalt and wet mix for 60s, and finally add the modified filler and continue to wet mix for 40s to obtain the asphalt mixture; S2: The asphalt mixture is loaded into a test mold, and after static pressing at 170℃ using a double-sided static pressing process, it is cooled and demolded to obtain a skeleton-interlocked dense asphalt mixture.

[0050] The coarse aggregate is basalt, with a particle size distribution of 30% for 31.5mm, 35% for 16mm, and 40% for 9.5mm.

[0051] The fine aggregate is limestone with a particle size of 5 mm.

[0052] The modified asphalt mentioned is SBS modified asphalt.

[0053] The S1 method uses a stepwise filling method to adjust the gradation so that the asphalt mixture forms key points of skeleton interlocking at particle sizes of 16mm and 9.5mm, with the 0.075mm pass rate controlled at 5% and the 4.75mm pass rate controlled at 25%.

[0054] The stirring rate of the S1 stirring device is 50 r / min.

[0055] The S2 double-sided static pressure forming process steps are as follows: first, increase the pressure to 3MPa, static pressure for 15s, then increase the pressure to 5MPa, static pressure for 25s.

[0056] The method for preparing the modified filler is as follows: 100g of limestone powder, 4g of γ-methacryloxypropyltrimethoxysilane, 6g of magnesium salt of 8-aniline-1-naphthalenesulfonate, 900g of anhydrous ethanol and 0.4g of sodium perethanol were mixed, heated and reacted, and then filtered, washed and dried to obtain the modified filler.

[0057] The heating reaction was carried out at a temperature of 80°C for 6 hours.

[0058] The drying temperature is 120℃ and the time is 10 hours.

[0059] Comparative Example 1 A method for preparing a skeleton-interlocked compacted asphalt mixture, comprising the following steps: S1: Preheat 60g of coarse aggregate and 20g of fine aggregate to 170℃, preheat 3g of filler to 160℃, and heat 4.2g of modified asphalt to 165℃; first, put the preheated coarse aggregate and fine aggregate into the mixing equipment and dry mix for 30s, then add the modified asphalt and wet mix for 45s, and finally add the filler and continue to wet mix for 30s to obtain the asphalt mixture; S2: The asphalt mixture is loaded into a test mold, and after static pressing at 160℃ using a double-sided static pressing process, it is cooled and demolded to obtain a skeleton-interlocked dense asphalt mixture.

[0060] The coarse aggregate is basalt, with a particle size distribution of 25% for 19mm, 30% for 13.2mm, and 35% for 9.5mm.

[0061] The fine aggregate is limestone with a particle size of 2mm.

[0062] The modified asphalt mentioned is SBS modified asphalt.

[0063] The S1 method uses a step-by-step filling method to adjust the gradation, so that the asphalt mixture forms key points of skeleton interlocking at particle sizes of 19mm and 13.2mm, and the 0.075mm passing rate is controlled at 3% and the 4.75mm passing rate is controlled at 20%.

[0064] The stirring rate of the S1 stirring device is 40 r / min.

[0065] The S2 double-sided static pressure forming process steps are as follows: first, increase the pressure to 2MPa, static pressure for 10s, then increase the pressure to 4MPa, static pressure for 20s.

[0066] The filler is limestone powder.

[0067] Comparative Example 2 A method for preparing a skeleton-interlocked compacted asphalt mixture, comprising the following steps: S1: Preheat 60g of coarse aggregate and 20g of fine aggregate to 170℃, preheat 3g of filler to 160℃, and heat 4.2g of modified asphalt to 165℃; first, put the preheated coarse aggregate and fine aggregate into the mixing equipment and dry mix for 30s, then add the modified asphalt and wet mix for 45s, and finally add the modified filler and continue to wet mix for 30s to obtain the asphalt mixture; S2: The asphalt mixture is loaded into a test mold, and after static pressing at 160℃ using a double-sided static pressing process, it is cooled and demolded to obtain a skeleton-interlocked dense asphalt mixture.

[0068] The coarse aggregate is basalt, with a particle size distribution of 25% for 19mm, 30% for 13.2mm, and 35% for 9.5mm.

[0069] The fine aggregate is limestone with a particle size of 2mm.

[0070] The modified asphalt mentioned is SBS modified asphalt.

[0071] The S1 method uses a step-by-step filling method to adjust the gradation, so that the asphalt mixture forms key points of skeleton interlocking at particle sizes of 19mm and 13.2mm, and the 0.075mm passing rate is controlled at 3% and the 4.75mm passing rate is controlled at 20%.

[0072] The stirring rate of the S1 stirring device is 40 r / min.

[0073] The S2 double-sided static pressure forming process steps are as follows: first, increase the pressure to 2MPa, static pressure for 10s, then increase the pressure to 4MPa, static pressure for 20s.

[0074] The method for preparing the modified filler is as follows: 70g of limestone powder, 3g of magnesium 8-aniline-1-naphthalenesulfonate, 600g of anhydrous ethanol, and 0.2g of sodium perethanol were mixed, heated and reacted, and then filtered, washed, and dried to obtain the modified filler.

[0075] The heating reaction was carried out at a temperature of 70°C for 3 hours.

[0076] The drying temperature is 100℃ and the time is 5 hours.

[0077] Comparative Example 3 A method for preparing a skeleton-interlocked compacted asphalt mixture, comprising the following steps: S1: Preheat 60g of coarse aggregate and 20g of fine aggregate to 170℃, preheat 3g of filler to 160℃, and heat 4.2g of modified asphalt to 165℃; first, put the preheated coarse aggregate and fine aggregate into the mixing equipment and dry mix for 30s, then add the modified asphalt and wet mix for 45s, and finally add the modified filler and continue to wet mix for 30s to obtain the asphalt mixture; S2: The asphalt mixture is loaded into a test mold, and after static pressing at 160℃ using a double-sided static pressing process, it is cooled and demolded to obtain a skeleton-interlocked dense asphalt mixture.

[0078] The coarse aggregate is basalt, with a particle size distribution of 25% for 19mm, 30% for 13.2mm, and 35% for 9.5mm.

[0079] The fine aggregate is limestone with a particle size of 2mm.

[0080] The modified asphalt mentioned is SBS modified asphalt.

[0081] The S1 method uses a step-by-step filling method to adjust the gradation, so that the asphalt mixture forms key points of skeleton interlocking at particle sizes of 19mm and 13.2mm, and the 0.075mm passing rate is controlled at 3% and the 4.75mm passing rate is controlled at 20%.

[0082] The stirring rate of the S1 stirring device is 40 r / min.

[0083] The S2 double-sided static pressure forming process steps are as follows: first, increase the pressure to 2MPa, static pressure for 10s, then increase the pressure to 4MPa, static pressure for 20s.

[0084] The method for preparing the modified filler is as follows: 70g of limestone powder, 2g of γ-methacryloxypropyltrimethoxysilane, 600g of anhydrous ethanol, and 0.2g of sodium perethanol were mixed, heated and reacted, and then filtered, washed, and dried to obtain the modified filler.

[0085] The heating reaction was carried out at a temperature of 70°C for 3 hours.

[0086] The drying temperature is 100℃ and the time is 5 hours.

[0087] Table 1 shows the test results of Marshall stability, low-temperature flexural strain, and freeze-thaw splitting strength ratio of the asphalt mixtures prepared in the examples and comparative examples. Table 1. Summary of test results for Marshall stability, low-temperature flexural strain, and freeze-thaw splitting strength ratio of asphalt mixtures: Through data analysis of the above embodiments and comparative examples, the asphalt mixture prepared by the present invention has significantly improved Marshall stability, low-temperature flexural strain, and freeze-thaw splitting strength ratio, and can effectively resist high-temperature rutting, low-temperature cracking and water damage.

[0088] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A method for preparing a skeleton embedded and extruded dense asphalt mixture, comprising the following steps: S1: preheating 60-75 parts of coarse aggregate and 20-30 parts of fine aggregate to 170-180 DEG C, preheating 3-6 parts of filler to 160-170 DEG C, and heating 4.2-5.0 parts of modified asphalt to 165-175 DEG C; first, putting the preheated coarse aggregate and fine aggregate into a stirring device, dry mixing for 30-45 s, then adding the modified asphalt and wet mixing for 45-60 s, and finally adding the modified filler and continuing wet mixing for 30-40 s to obtain an asphalt mixture; S2: loading the asphalt mixture into a mold, and using a double-sided static pressure forming process to form the asphalt mixture at a temperature of 160-170 DEG C, then cooling, demolding, and obtaining a skeleton embedded and extruded dense asphalt mixture. The modified filler is obtained by reacting limestone powder, gamma-methacryloxypropyltrimethoxysilane, 8-anilino-1-naphthalenesulfonic acid magnesium salt, and sodium ethoxide. The coarse aggregate is basalt, and the particle size grading is 19-31.5 mm, accounting for 25-30%, 13.2-19 mm, accounting for 30-35%, and 9.5-13.2 mm, accounting for 35-40%. The fine aggregate is limestone, and the particle size is 2-5 mm.

2. The method for preparing a skeleton-interlocked compacted asphalt mixture according to claim 1, characterized in that: The modified asphalt is SBS modified asphalt.

3. The method for preparing a skeleton-interlocked compacted asphalt mixture according to claim 1, characterized in that: In the step S1, the grading is adjusted by using a step-by-step filling method, so that the asphalt mixture forms skeleton embedded and extruded key points at particle sizes of 16-19 mm and 9.5-13.2 mm, and the passing rate of 0.075 mm is controlled at 3-5% and the passing rate of 4.75 mm is controlled at 20-25%.

4. The method for preparing a skeleton-interlocked compacted asphalt mixture according to claim 1, characterized in that: The stirring rate of the stirring device in the step S1 is 40-50 r / min.

5. The method for preparing a skeleton-interlocked compacted asphalt mixture according to claim 1, characterized in that: The double-sided static pressure forming process in the step S2 comprises the following steps: first, increasing the pressure to 2-3 MPa and static pressure for 10-15 s, then increasing the pressure to 4-5 MPa and static pressure for 20-25 s.

6. The method for preparing a skeleton-interlocked compacted asphalt mixture according to claim 1, characterized in that: The preparation method of the modified filler is as follows:

7. The method for preparing a skeleton-interlocked compacted asphalt mixture according to claim 1, characterized in that: mixing 70-100 parts of limestone powder, 2-4 parts of gamma-methacryloxypropyltrimethoxysilane, 3-6 parts of 8-anilino-1-naphthalenesulfonic acid magnesium salt, 600-900 parts of anhydrous ethanol, and 0.2-0.4 parts of sodium ethoxide, then performing a temperature rising reaction, and after filtration, washing, and drying, obtaining the modified filler.

8. The method for preparing a skeleton-interlocked compacted asphalt mixture according to claim 1, characterized in that: The temperature rising reaction is performed at a temperature of 70-80 DEG C for 3-6 h. The drying temperature is 100-120 DEG C, and the drying time is 5-10 h.

9. The method for preparing a skeleton-interlocked compacted asphalt mixture according to claim 8, characterized in that: ​ 10. The method for preparing a skeleton-interlocked compacted asphalt mixture according to claim 8, characterized in that: ​

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