A permanent deformation resistant asphalt mixture product and a method of making the same

Abstract

The application provides a permanent deformation resistant asphalt mixture product and a preparation method thereof. The asphalt mixture product is composed of 3.8-5.5% binder, 94-96% mineral aggregate and 0.2-0.5% rock wool material, wherein the binder comprises petroleum asphalt and single-component wet-curing polymer material, and the mineral aggregate is composed of 94-97% >0.075 mm mineral aggregate and 3-6% ≤0.075 mm mineral aggregate. The prepared permanent deformation resistant asphalt mixture product has the advantages of simple preparation process, excellent permanent deformation resistance, and suitability for hot-mixed asphalt mixture and cold-mixed asphalt mixture. In addition, the product uses rock wool as part of the mineral aggregate, which helps to improve the fatigue resistance and weather resistance of the asphalt mixture, and has good fire resistance.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of asphalt materials, and particularly relates to a permanent deformation resistant asphalt mixture product and a preparation method thereof. BACKGROUND

[0002] Permanent deformation, as one of the most common asphalt pavement diseases, seriously affects the comfort and safety of driving, and its maintenance and disposal requires a large amount of funds. How to improve the modulus of asphalt mixture to delay the occurrence of permanent deformation, improve the safety and comfort of driving, prolong the maintenance period of asphalt road, and reduce the maintenance cost has become a hot research direction.

[0003] Most of the existing permanent deformation resistant asphalt mixture products mainly add high modulus admixtures in the mixing and production process to improve the modulus of asphalt mixture. Since recycled polyolefin materials are used as the main raw materials for the high modulus admixtures, there is a large variability, and the polyolefin materials cannot be uniformly mixed with the aggregates after a short mixing and production process. Some use recycled asphalt mixture to improve the modulus of asphalt mixture, but also have the above problems.

[0004] Chinese patent CN 114213061 A proposes a high modulus asphalt mixture product and a preparation method thereof, which contains mineral materials and modified asphalt. The mineral materials are 94-96%, and the modified asphalt is 4-6%. The mineral materials are composed of aggregates, mineral powder and fillers, and the aggregates, mineral powder and fillers account for 92-96%, 0-8% and 0-4% of the total weight of the mineral materials, respectively. The aggregates, mineral powder, fillers and modified asphalt are mixed into high modulus asphalt mixture in a certain proportion. Although it has the advantage of uniform mixing, since the low-grade asphalt is used as an end product of crude oil refining, it is different from ordinary heavy asphalt. Its yield is low and is greatly affected by the adjustment of crude oil refining process. The raw materials have certain variability. The low temperature performance of the product is greatly affected by the addition of low-grade asphalt binder. The large amount of admixtures leads to large asphalt viscosity, and the compaction after pavement construction is difficult. The product is only suitable for hot mix asphalt mixture, and is not suitable for road maintenance and small construction, which has certain limitations.

[0005] Therefore, the present application proposes a permanent deformation resistant asphalt mixture product and a preparation method thereof. The preparation process is simple, and the product is not only suitable for hot mix asphalt mixture, but also suitable for cold mix asphalt mixture. SUMMARY

[0006] In order to solve the problems of product quality caused by material variability and other problems, the purpose of the present application is to propose a permanent deformation resistant asphalt mixture product and a preparation method thereof to solve the above technical problems.

[0007] In a first aspect, the present application provides a permanent deformation resistant asphalt mixture product, the asphalt mixture product is composed of 3.8-5.5% binder, 94-96% mineral aggregate and 0.2-0.5% rock wool material, wherein the binder comprises petroleum asphalt and single-component moisture-cured polymeric material, and the mineral aggregate is composed of 94-97% >0.075 mm mineral aggregate and 3-6% ≤0.075 mm mineral aggregate.

[0008] Through the above technical solution, the single-component moisture-cured polyurethane used in the present application is a liquid material at room temperature, which can be added in petroleum asphalt and also can be added online in the mixing plant. Regardless of which processing method, the low viscosity at room temperature can ensure uniform mixing and solve the product quality problem caused by material variability. Using rock wool as part of the mineral aggregate can help improve the fatigue resistance and weather resistance of the asphalt mixture and has good fire resistance.

[0009] In a preferred embodiment, the permanent deformation resistant asphalt mixture product according to claim 1, the binder is specifically composed of 65-80% petroleum asphalt, 0-5% polymeric modifier, 0-0.2% stabilizer and 20-35% single-component moisture-cured polymeric material.

[0010] In the above technical solution, the polymeric modifier is added to the binder, which helps to improve the high and low temperature performance of the asphalt mixture.

[0011] In a preferred embodiment, the single-component moisture-cured polymeric material is single-component moisture-cured polyurethane, and the NCO value is 8-10%.

[0012] In a preferred embodiment, the single-component moisture-cured polyurethane is a product obtained by reacting isophorone diisocyanate monomer, polyether polyol and triethylene diamine under the protection of inert gas.

[0013] In a preferred embodiment, the single-component moisture-cured polyurethane is a product obtained by reacting isophorone diisocyanate multimer, polyether polyol and triethylene diamine under the protection of inert gas.

[0014] In a preferred embodiment, the petroleum asphalt is No. 70 A-grade asphalt or No. 90 A-grade asphalt.

[0015] In a preferred embodiment, the polymeric modifier is a block copolymer with a styrene to butadiene ratio of 3:7.

[0016] In a second aspect, the present application provides a preparation method of a permanent deformation resistant asphalt mixture product, comprising the following steps:

[0017] S11, binder preparation: heat petroleum pitch to above 160℃, add polymer modifier to obtain a first mixture, after the first mixture is completely swelled and uniform, add one-component wet curing polyurethane to obtain a binder, stir the binder until uniform and ready for use;

[0018] S12, raw material preparation: weigh the mineral aggregate according to the proportion and ready for use, the ≤0.075mm mineral aggregate and rock wool are separately placed, the >0.075mm mineral aggregate and the binder prepared in step S11 are placed in an oven for heat preservation, wherein the heat preservation temperature of the binder is 170-180℃, and the heat preservation temperature of the mineral aggregate is 180-200℃;

[0019] S13, permanent deformation resistant asphalt mixture product: add the preheated mineral aggregate and binder to the mixing equipment according to the proportion, stir for 90s, after the mixing is completed, add the ≤0.075mm mineral aggregate and rock wool to continue mixing for 90s, to obtain the permanent deformation resistant asphalt mixture product.

[0020] In a preferred embodiment, the method for preparing the permanent deformation resistant asphalt mixture product comprises the following steps:

[0021] S21, binder preparation: heat petroleum pitch to above 160℃, add one-component wet curing polyurethane to obtain a binder, heat preservation and ready for use;

[0022] S22, raw material preparation: weigh the mineral aggregate according to the proportion and ready for use, the ≤0.075mm mineral aggregate and rock wool are separately placed, the >0.075mm mineral aggregate and the binder prepared in step S21 are placed in an oven for heat preservation, wherein the heat preservation temperature of the binder is 170-180℃, and the heat preservation temperature of the mineral aggregate is 180-200℃;

[0023] S23, permanent deformation resistant asphalt mixture product: add the preheated mineral aggregate and binder to the mixing equipment according to the proportion, stir for 90s, after the mixing is completed, add the ≤0.075mm mineral aggregate and rock wool to continue mixing for 90s, to obtain the permanent deformation resistant asphalt mixture product.

[0024] The above technical solution can prepare the permanent deformation resistant asphalt mixture product, and the preparation process is simple, and the obtained asphalt mixture product has excellent permanent deformation resistance, which is not only suitable for hot-mixed asphalt mixture, but also suitable for cold-mixed asphalt mixture.

[0025] The permanent deformation resistant asphalt mixture product and the preparation method thereof provided in the application have the following advantages

[0026] Advantages:

[0027] (1) The single-component moisture-cured polyurethane used in the present application is a liquid material at room temperature, which can be added in petroleum asphalt and also can be added online in the mixing building. No matter which processing method is used, the mixture can be ensured to be uniform due to the low viscosity at room temperature, and the product quality problem caused by material variability is solved.

[0028] (2) The filler used in the present application is rock wool material, which has good weather resistance, high strength, high modulus, and flame retardant characteristics.

[0029] (3) The asphalt binder of the present application is added with a polymer modifier, which helps to improve the high and low temperature performance of the asphalt mixture.

[0030] (4) The preparation process of the present application is simple, and the single-component moisture-cured polymer material after curing not only has excellent permanent deformation resistance, but also has good low temperature performance, which is suitable for hot-mixed asphalt mixture and cold-mixed asphalt mixture. BRIEF DESCRIPTION OF DRAWINGS

[0031] Other features, objects, and advantages of the present application will become more apparent from the following detailed description of non-limiting embodiments made with reference to the accompanying drawings:

[0032] Figure 1 is an embodiment flow chart of the preparation method of the permanent deformation resistant asphalt mixture product of the present application;

[0033] Figure 2 is another embodiment flow chart of the preparation method of the permanent deformation resistant asphalt mixture product of the present application. DETAILED DESCRIPTION

[0034] The present application will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the related application, and not to limit the application. In addition, it should be noted that only the parts related to the application are shown in the drawings for ease of description.

[0035] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings and embodiments.

[0036] In a first aspect, the present application provides a permanent deformation resistant asphalt mixture product, which comprises 3.8-5.5% binder, 94-96% mineral aggregate, and 0.2-0.5% rock wool material, wherein the binder comprises petroleum asphalt and single-component moisture-cured polymer material, and the mineral aggregate is composed of 94-97% >0.075 mm mineral aggregate and 3-6% ≤0.075 mm mineral aggregate.

[0037] Preferably, the binder is composed of 65-80% petroleum pitch, 0-5% polymer modifier, 0-0.2% stabilizer and 20-35% single-component moisture-cured polymer material.

[0038] The single-component moisture-cured polymer material is preferably a single-component moisture-cured polyurethane with an NCO value of 8-10%. Preferably, the single-component moisture-cured polyurethane is a product obtained by reacting isophorone diisocyanate monomer, polyether polyol and triethylene diamine under inert gas protection. Alternatively, the single-component moisture-cured polyurethane is a product obtained by reacting isophorone diisocyanate polymer, polyether polyol and triethylene diamine under inert gas protection. The inert gas is preferably helium or neon or argon.

[0039] Preferably, the petroleum pitch is No. 70 A-grade pitch or No. 90 A-grade pitch.

[0040] Preferably, the polymer modifier is a block copolymer with a styrene to butadiene ratio of 3:7.

[0041] In a second aspect, the application provides a method for preparing a permanent deformation resistant asphalt mixture product, Figure 1 An embodiment flow chart of the method for preparing a permanent deformation resistant asphalt mixture product of the application is shown in FIG. 1. Figure 1 The method comprises the following steps:

[0042] S11, binder preparation: heat the petroleum pitch to above 160°C, add the polymer modifier to obtain a first mixture, and after the first mixture is completely swelled and uniform, add the single-component moisture-cured polyurethane to obtain the binder, and stir the binder until uniform for use;

[0043] S12, raw material preparation: weigh the mineral aggregate according to the proportion for use, separately store the ≤0.075 mm mineral aggregate and rock wool, and place the >0.075 mm mineral aggregate and the binder prepared in step S11 in an oven for heat preservation, wherein the heat preservation temperature of the binder is 170-180°C and the heat preservation temperature of the mineral aggregate is 180-200°C;

[0044] S13, permanent deformation resistant asphalt mixture product: add the preheated mineral aggregate and binder to the mixing equipment according to the proportion, stir for 90s, and after the mixing is completed, add the ≤0.075 mm mineral aggregate and rock wool to continue mixing for 90s to obtain the permanent deformation resistant asphalt mixture product.

[0045] Figure 2 Another embodiment flow chart of the method for preparing a permanent deformation resistant asphalt mixture product of the application is shown in FIG. 2. Figure 2 The method comprises the following steps:

[0046] S21, binder preparation: heat petroleum pitch to above 160℃, add single-component moisture-cured polyurethane to obtain a binder, and keep the binder warm for use;

[0047] S22, raw material preparation: weigh the mineral aggregates according to the proportion for use, separately place the <0.075 mm mineral aggregate and rock wool, and place the >0.075 mm mineral aggregate and the binder prepared in step S21 in an oven for warm keeping, wherein the warm keeping temperature of the binder is 170-180℃, and the warm keeping temperature of the mineral aggregate is 180-200℃;

[0048] S23, permanent deformation resistant asphalt mixture product: add the preheated mineral aggregate and binder to the mixing device according to the proportion, stir for 90s, and then add the <0.075 mm mineral aggregate and rock wool to continue stirring for 90s to obtain the permanent deformation resistant asphalt mixture product.

[0049] Example 1

[0050] The material composition ratio of the permanent deformation resistant asphalt mixture is shown in Table 1:

[0051] Table 1 Permanent deformation resistant asphalt mixture ratio

[0052] Material name Mineral aggregate Rock wool Binder Composition ratio 95.1％ 0.3％ 4.6％

[0053] The mineral aggregate is composed of 94% >0.075 mm mineral aggregate and 6% <0.075 mm mineral aggregate. The composition ratio of the binder is shown in Table 2:

[0054] Table 2 Composition ratio of binder

[0055]

[0056] Specifically, the permanent deformation resistant asphalt mixture is prepared according to the following steps:

[0057] Step one, binder preparation: heat 74.9% petroleum pitch to above 160℃, add 5% polymer modifier, and after complete swelling and uniformity, add 20% single-component moisture-cured polyurethane and 0.1% stabilizer to obtain a binder, and stir the binder uniformly for use.

[0058] Step two, weigh >0.075 mm mineral aggregate and <0.075 mm mineral aggregate according to the ratio of 94:6 for use, separately place rock wool and <0.075 mm mineral aggregate, and place >0.075 mm mineral aggregate and binder in an oven for warm keeping. The warm keeping temperature of the binder is 170-175℃, and the warm keeping temperature of the mineral aggregate is 185-190℃.

[0059] Step three, permanent deformation resistant asphalt mixture preparation: the preheated mineral aggregate and binder are added into the mixing device in proportion, stirred for 90s, and then the rock wool and ≤0.075mm mineral aggregate are added and stirred for another 90s to obtain the permanent deformation resistant asphalt mixture.

[0060] After the preparation of the above permanent deformation resistant asphalt mixture, the technical indexes of the prepared permanent deformation resistant asphalt mixture are shown in Table 3.

[0061] Table 3 Technical indexes of permanent deformation resistant asphalt mixture

[0062] Technical index Unit Required value Measured value Dynamic stability (60℃, 0.7MPa) times / mm ≥6000 16650 Modulus (15℃, 10Hz), MPa ≥14000 15731 Low temperature bending strain μξ ≥2500 2613 TSR ％ ≥80 86

[0063] As can be seen from the data in Table 3, the permanent deformation resistant asphalt mixture product prepared by the present application has exceeded the required value, especially the dynamic stability can reach 16650 times / mm. The addition of the polymer modifier makes the low-temperature bending strain of the asphalt mixture product reach 2613μξ, which obviously helps to improve the high and low temperature performance of the asphalt mixture.

[0064] Example 2

[0065] The material composition ratio of the permanent deformation resistant asphalt mixture is shown in Table 4:

[0066] Table 4 Proportion of permanent deformation resistant asphalt mixture

[0067] Material name Mineral aggregate Rock wool Binder Composition ratio 96 0.2 3.8

[0068] The mineral aggregate is composed of 97% >0.075mm mineral aggregate and 3% ≤0.075mm mineral aggregate. The composition ratio of the binder is shown in Table 5:

[0069] Table 5 Composition ratio of binder

[0070]

[0071] Specifically, the permanent deformation resistant asphalt mixture is prepared according to the following steps:

[0072] Step one, binder preparation: 65% petroleum asphalt is heated to above 160℃, 3% polymer modifier is added, and after complete swelling and uniformity, 32% single-component wet-cured polyurethane is added to obtain the binder. The binder is stirred uniformly for use.

[0073] Step two, >0.075mm mineral aggregate and ≤0.075mm mineral aggregate are weighed in proportion of 97:3 for use. The rock wool and ≤0.075mm mineral aggregate are separately placed, and the >0.075mm mineral aggregate and the binder are placed in an oven for heat preservation. The heat preservation temperature of the binder is 170-175℃, and the heat preservation temperature of the mineral aggregate is 185-190℃.

[0074] Step three, permanent deformation resistant asphalt mixture preparation: the preheated mineral aggregate and binder are added to the mixing device in proportion, stirred for 90s, and after the end of mixing, rock wool and ≤0.075mm mineral aggregate are added and continue to mix for 90s to obtain the permanent deformation resistant asphalt mixture.

[0075] After the preparation of the above permanent deformation resistant asphalt mixture is completed, the technical indexes of the prepared permanent deformation resistant asphalt mixture are shown in Table 6.

[0076] Table 6 Technical indexes of permanent deformation resistant asphalt mixture

[0077] Technical index Unit Required value Measured value Dynamic stability (60℃, 0.7MPa) times / mm ≥6000 18880 Modulus (15℃, 10Hz), MPa ≥14000 16899 Low temperature bending strain μξ ≥2500 2286 TSR ％ ≥80 85

[0078] As can be seen from the data in Table 6, the permanent deformation resistant asphalt mixture product prepared by the present application exceeds the required value, and the addition of the polymer modifier makes the low-temperature bending strain of the asphalt mixture product reach 2586μξ, which obviously helps to improve the high and low temperature performance of the asphalt mixture.

[0079] Example 3

[0080] The material composition ratio of the permanent deformation resistant asphalt mixture is shown in Table 7:

[0081] Table 7 Proportion of permanent deformation resistant asphalt mixture

[0082] Material name Mineral aggregate Rock wool Binder Composition ratio 94％ 0.5％ 5.5％

[0083] Among them, the mineral aggregate is composed of 95% >0.075mm mineral aggregate and 5% ≤0.075mm mineral aggregate. The composition ratio of the binder is shown in Table 8:

[0084] Table 8 Composition ratio of binder

[0085]

[0086] Specifically, the permanent deformation resistant asphalt mixture is prepared according to the following steps:

[0087] Step one, binder preparation: 80% petroleum asphalt is heated to above 160℃, 20% one-component wet-cured polyurethane is added, and a binder is obtained. The binder is stirred uniformly and ready for use.

[0088] Step two, >0.075mm mineral aggregate and ≤0.075mm mineral aggregate are weighed in proportion of 95:5 and ready for use. Rock wool and ≤0.075mm mineral aggregate are placed separately, and >0.075mm mineral aggregate and binder are placed in an oven for heat preservation. The heat preservation temperature of the binder is 170-175℃, and the heat preservation temperature of the mineral aggregate is 185-190℃.

[0089] Step three, preparation of permanent deformation resistant asphalt mixture: the preheated mineral aggregate and binder are added into the mixing device in proportion, stirred for 90s, and then the rock wool and ≤0.075mm mineral aggregate are added and stirred for another 90s to obtain the permanent deformation resistant asphalt mixture.

[0090] After the preparation of the permanent deformation resistant asphalt mixture, the technical indexes of the prepared permanent deformation resistant asphalt mixture are shown in Table 9.

[0091] Table 9 Technical indexes of permanent deformation resistant asphalt mixture

[0092] Technical index Unit Required value Measured value Dynamic stability (60℃, 0.7MPa) times / mm ≥6000 13450 Modulus (15℃, 10Hz), MPa ≥14000 14850 Low temperature bending strain μξ ≥2500 2538 TSR ％ ≥80 84

[0093] As can be seen from the data in Table 9, the permanent deformation resistant asphalt mixture product prepared in the present application exceeds the required value.

[0094] Example 4

[0095] The material composition ratio of the permanent deformation resistant asphalt mixture is shown in Table 10:

[0096] Table 10 Proportion of permanent deformation resistant asphalt mixture

[0097] Material name Mineral aggregate Rock wool Binder Composition ratio 95.1％ 0.3％ 4.6％

[0098] The mineral aggregate is composed of 94% >0.075mm mineral aggregate and 6% ≤0.075mm mineral aggregate. The composition ratio of the binder is shown in Table 11:

[0099] Table 11 Composition ratio of binder

[0100]

[0101] Specifically, the preparation of the permanent deformation resistant asphalt mixture is carried out according to the following steps:

[0102] Step one, preparation of binder: 65% petroleum asphalt is heated to above 160℃, and 35% single-component wet-cured polyurethane is added to obtain the binder, which is stirred uniformly for use.

[0103] Step two, >0.075mm mineral aggregate and ≤0.075mm mineral aggregate are weighed in a proportion of 94:6 for use, and the rock wool and ≤0.075mm mineral aggregate are placed separately, and the >0.075mm mineral aggregate and the binder are placed in an oven for heat preservation. The heat preservation temperature of the binder is 170-175℃, and the heat preservation temperature of the mineral aggregate is 185-190℃.

[0104] Step three, permanent deformation resistant asphalt mixture preparation: the preheated mineral aggregate and binder are added to the mixing device in proportion, stirred for 90s, and then the rock wool and <0.075mm mineral aggregate are added and stirred for another 90s to obtain the permanent deformation resistant asphalt mixture.

[0105] After the preparation of the permanent deformation resistant asphalt mixture, the technical indexes of the prepared permanent deformation resistant asphalt mixture are shown in Table 12.

[0106] Table 12 Technical indexes of permanent deformation resistant asphalt mixture

[0107] Technical index Unit Required value Measured value Dynamic stability (60℃, 0.7MPa) times / mm ≥6000 17890 Modulus (15℃, 10Hz), MPa ≥14000 16634 Low temperature bending strain μξ ≥2500 2420 TSR ％ ≥80 86

[0108] As can be seen from the data in Table 12, the permanent deformation resistant asphalt mixture product prepared in this embodiment exceeds the required value.

[0109] The above description is merely preferred embodiments of the present application and a description of the principles of the technology used. Those skilled in the art should understand that the scope of the application involved in the present application is not limited to the technical solutions formed by the specific combination of the above technical features, and should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the above inventive concept. For example, the above features are replaced with the technical features disclosed in the present application (but not limited to) having similar functions to form technical solutions.

Claims

1. A permanent deformation resistant asphalt mixture product, characterized in that, The asphalt mixture product is composed of 3.8-5.5% binder, 94-96% aggregate, and 0.2-0.5% rock wool material. The binder comprises petroleum asphalt and a single-component moisture-curing polymer material. Specifically, the binder consists of 65-80% petroleum asphalt, 0-5% polymer modifier, 0-0.2% stabilizer, and 20-35% of the single-component moisture-curing polymer material. The single-component moisture-curing polymer material is a single-component moisture-curing polyurethane with an NCO value of 8-10%. The polymer modifier is a block copolymer of styrene and butadiene in a 3:7 ratio. The aggregate consists of 94-97% aggregate >0.075mm and 3-6% aggregate ≤0.075mm.

2. The asphalt mixture product resistant to permanent deformation according to claim 1, characterized in that, The single-component moisture-curing polyurethane is a product obtained by reacting isophorone diisocyanate monomer, polyether polyol and triethylenediamine under inert gas protection.

3. The asphalt mixture product resistant to permanent deformation according to claim 1, characterized in that, The single-component moisture-curing polyurethane is a product obtained by reacting isophorone diisocyanate polymer, polyether polyol and triethylenediamine under inert gas protection.

4. The asphalt mixture product resistant to permanent deformation according to claim 1, characterized in that, The petroleum asphalt is either Grade 70A or Grade 90A asphalt.

5. The method for preparing the asphalt mixture product resistant to permanent deformation according to any one of claims 1-4, characterized in that, Includes the following steps: S11. Preparation of binder: The petroleum asphalt is heated to above 160°C, and a polymer modifier is added to obtain a first mixture. After the first mixture is completely swollen and uniform, a single-component moisture-curing polyurethane is added to obtain the binder. The binder is stirred evenly and set aside for use. S12. Raw material preparation: Weigh the mineral materials according to the proportion and set aside. Mineral materials ≤0.075mm and rock wool are placed separately. Mineral materials >0.075mm and the binder material obtained in step S11 are placed in an oven for heat preservation. The heat preservation temperature of the binder material is 170-180℃, and the heat preservation temperature of the mineral materials is 180-200℃. S13. Permanent deformation resistant asphalt mixture product: Add the preheated aggregate and binder to the mixing equipment in proportion, stir for 90s, add aggregate ≤0.075mm and rock wool after mixing and continue mixing for 90s to obtain permanent deformation resistant asphalt mixture product.

6. The method for preparing the asphalt mixture product resistant to permanent deformation according to claim 1, characterized in that, Includes the following steps: S21. Preparation of binder: The petroleum asphalt is heated to above 160°C, and a single-component moisture-curing polyurethane is added to obtain the binder. The binder is then kept warm for later use. S22. Raw material preparation: Weigh the mineral materials according to the proportion and set aside. Mineral materials ≤0.075mm and rock wool are placed separately. Mineral materials >0.075mm and the binder material obtained in step S21 are placed in an oven for heat preservation. The heat preservation temperature of the binder material is 170-180℃, and the heat preservation temperature of the mineral materials is 180-200℃. S23. Permanent deformation resistant asphalt mixture product: Add the preheated aggregate and binder to the mixing equipment in proportion, stir for 90s, add aggregate ≤0.075mm and rock wool after mixing and continue mixing for 90s to obtain permanent deformation resistant asphalt mixture product.

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