High-modulus asphalt and its preparation method and application

Abstract

The present invention provides a high-modulus asphalt and its preparation method and application. The raw materials of the high-modulus asphalt include: 100 parts by weight of low-grade asphalt, 1 to 10 parts by weight of a modifier, and 0.2 to 0.4 parts by weight of a stabilizer. The penetration of the low-grade asphalt is 30 to 50 dmm. After mixing SIS, SEBS or SEPS with SBS, the present invention can not only improve the modulus of the asphalt, but also further maintain and improve the durability and anti-aging ability, and is more suitable for use in long-life pavements.

Description

Technical Field

[0001] The present invention relates to the technical field of high modulus asphalt, and particularly to a high modulus asphalt and its preparation method and application. Background Art

[0002] Long-life asphalt roads require the use of high modulus asphalt mixtures. High modulus asphalt mixtures are pavement materials with relatively high overall modulus and excellent rutting resistance and fatigue resistance. By increasing the modulus parameters of asphalt mixtures, under the action of the same cumulative axle load, the thickness of the asphalt layer structure can be thinner, and the bearing capacity and service life can still meet or even exceed the design requirements. Moreover, a large amount of stone materials can be saved, which is of great significance for areas lacking high-quality stone materials. The main purpose of high modulus asphalt is to increase the modulus parameters in structural calculations, reduce the thickness of the asphalt layer, meet the requirements of structural calculations, and at the same time reduce the project cost.

[0003] The core of high modulus asphalt mixture is high modulus asphalt. High modulus asphalt is asphalt that can significantly increase the stiffness modulus and fatigue resistance of asphalt mixtures. High modulus asphalt generally achieves its performance through three channels. One is to use hard asphalt. Although the high-temperature rutting resistance of hard asphalt mixtures has been effectively verified, its low-temperature performance is poor. The second is to add natural asphalt, which can improve the high-temperature rutting resistance, bearing capacity and durability of asphalt mixtures. However, the reserves of natural asphalt are limited, and its low-temperature performance is also very poor. The third is to prepare high modulus asphalt by adding modifiers to asphalt. By selecting appropriate modifiers and modification processes, while increasing the overall modulus and high-temperature performance of the material, its low-temperature performance will not be lost too much. Summary of the Invention

[0004] To solve the above technical problems, the present invention provides a high modulus asphalt. Based on 100 parts by weight of low-grade asphalt, its raw materials include:

[0005] 100 parts by weight of low-grade asphalt,

[0006] 1 - 10 parts by weight of modifier,

[0007] 0.2 - 0.4 parts by weight of stabilizer,

[0008] The penetration of the low-grade asphalt is 30 - 50 dmm, such as 35 dmm, 40 dmm, 45 dmm.

[0009] According to the embodiments of the present invention, the colloidal instability index Ic of the low-grade asphalt ranges from 0.1 to 0.4, preferably from 0.15 to 0.4, more preferably from 0.15 to 0.35, such as 0.31.

[0010] According to an embodiment of the present invention, the low-grade asphalt may be selected from straight-run low-grade asphalt or blended low-grade asphalt, preferably straight-run low-grade asphalt, more preferably straight-run No. 30 asphalt or No. 40 asphalt.

[0011] According to an embodiment of the present invention, the low-grade asphalt is the low-grade asphalt obtained by cut with true boiling point distillation, and the cutting raw material may be, but is not limited to, one or more of heavy crude oils from the Middle East, South America, Sudan, Iran, Angola, etc.

[0012] According to an embodiment of the present invention, the penetration of the low-grade asphalt is 30-50 dmm, and the softening point is 50-60 °C.

[0013] According to an embodiment of the present invention, in the raw material, the modifier is, for example, 1 part by weight, 2 parts by weight, 3 parts by weight, 4 parts by weight, 5 parts by weight, 6 parts by weight, 6.5 parts by weight, 7 parts by weight, 8 parts by weight, 9 parts by weight.

[0014] According to an embodiment of the present invention, the modifier may be selected from at least one of SBS modifier, SIS modifier, SEBS modifier, and SEPS modifier. Exemplarily, the modifier is selected from SBS modifier and SIS modifier, and the mass ratio thereof is 1-7:1-7, such as 4:2, 4:6. Exemplarily, the modifier is selected from SBS modifier and SEBS modifier, and the mass ratio thereof is 1-10:1-10, such as 3:2.

[0015] According to an embodiment of the present invention, the SBS modifier may be selected from linear or star-shaped SBS thermoplastic elastomers.

[0016] According to an embodiment of the present invention, the SIS modifier may be selected from linear styrene-isoprene-styrene block copolymer (SIS).

[0017] According to an embodiment of the present invention, the SEBS modifier may be selected from linear or star-shaped styrene-ethylene / butadiene-styrene block copolymer (SEBS).

[0018] According to an embodiment of the present invention, the SEPS modifier may be selected from linear or star-shaped hydrogenated styrene-isoprene thermoplastic elastomer (SEPS).

[0019] According to an embodiment of the present invention, the molecular weight of the SBS modifier is 100,000-300,000, more preferably 100,000-150,000.

[0020] According to an embodiment of the present invention, the block ratio of the SBS modifier is preferably 30 / 70-40 / 60, more preferably 30 / 70.

[0021] According to an embodiment of the present invention, the molecular weight of the SIS modifier is 30,000 - 300,000, more preferably 100,000 - 200,000.

[0022] According to an embodiment of the present invention, the block ratio of the SIS modifier is preferably 15 / 85 - 30 / 70, more preferably 15 / 85.

[0023] According to an embodiment of the present invention, the molecular weight of the SEBS modifier is 100,000 - 250,000, more preferably 200,000 - 250,000.

[0024] According to an embodiment of the present invention, the styrene content of the SEBS modifier is preferably 30% - 35%, more preferably 35%.

[0025] According to an embodiment of the present invention, the molecular weight of the SEPS modifier is 50,000 - 200,000, more preferably 100,000 - 150,000.

[0026] According to an embodiment of the present invention, the hydrogenated styrene content of the SEPS modifier is preferably 30% - 35%, more preferably 30%.

[0027] According to an embodiment of the present invention, the stabilizer is selected from Runfeng Boyue HMD-1 asphalt stabilizer.

[0028] According to an embodiment of the present invention, in the raw materials, the stabilizer is, for example, 0.2 parts by weight, 0.3 parts by weight, 0.4 parts by weight.

[0029] According to an embodiment of the present invention, the raw materials of the high modulus asphalt further include a co-solvent.

[0030] According to an embodiment of the present invention, based on every 100 parts by weight of the low-grade asphalt, the dosage of the co-solvent is 0.1 - 2 parts by weight, for example, 0.8 parts by weight, 1 part by weight.

[0031] According to an embodiment of the present invention, the co-solvent is selected from Mantek plasticizer, for example, Mantek 5# aromatic plasticizer (FTZSJ-Ⅰ, FTZSJ-Ⅱ, FTZSJ-Ⅲ).

[0032] According to an exemplary scheme of the present invention, based on every 100 parts by weight of the low-grade asphalt, the raw materials of the high modulus asphalt include:

[0033] 100 parts by weight of low-grade asphalt,

[0034] 6 parts by weight of modifier,

[0035] 0.8 parts by weight of co-solvent,

[0036] Stabilizer: 0.2 to 0.4 parts by weight; wherein, the modifier is selected from SBS modifier and SIS modifier, and the mass ratio of SBS modifier to SIS modifier is 4:2 or 5:1.

[0037] According to an exemplary embodiment of the present invention, the raw materials of the high-modulus asphalt include:

[0038] Low-grade asphalt: 100 parts by weight,

[0039] Modifier: 6 parts by weight,

[0040] Co-solvent: 0.8 parts by weight,

[0041] Stabilizer: 0.2 to 0.4 parts by weight; wherein, the modifier is selected from SBS modifier and SEPS modifier, and the mass ratio of SBS modifier to SEPS modifier is 4:2.

[0042] According to an exemplary embodiment of the present invention, the raw materials of the high-modulus asphalt include:

[0043] Low-grade asphalt: 100 parts by weight,

[0044] Modifier: 7 parts by weight,

[0045] Co-solvent: 1.0 parts by weight,

[0046] Stabilizer: 0.2 to 0.4 parts by weight; wherein, the modifier is selected from SBS modifier and SEBS modifier, and the mass ratio of SBS modifier to SEPS modifier is 5:2.

[0047] According to an exemplary embodiment of the present invention, the raw materials of the high-modulus asphalt include:

[0048] Low-grade asphalt: 100 parts by weight,

[0049] Modifier: 6 parts by weight,

[0050] Co-solvent: 0.8 parts by weight,

[0051] Stabilizer: 0.2 to 0.4 parts by weight; wherein, the modifier is selected from SBS modifier, SIS modifier and SEBS modifier, and the mass ratio of SBS modifier, SIS modifier and SEBS modifier is 4:1:1.

[0052] According to an embodiment of the present invention, the technical indicators of the high-modulus asphalt include at least one, two or a combination of multiple of the following:

[0053] 1) Softening point: 85 - 99 °C, for example, 86 °C, 89 °C, 92 °C;

[0054] 2) Penetration: 30 - 40 dmm, such as 31 dmm, 33 dmm, 35 dmm;

[0055] 3) Complex modulus at 60 °C: 15 - 30 KPa, such as 19.3 KPa, 23.0 KPa, 25 KPa;

[0056] 4) Difference in complex modulus at 60 °C before and after RTFOT aging is 3 - 5 KPa, such as 3.3 KPa, 3.5 KPa, 4.7 KPa;

[0057] 5) Fatigue factor at 28 °C: 2500 - 4500, such as 3008, 4252, 3760.

[0058] The present invention provides a method for preparing the above high - modulus asphalt, comprising the following steps:

[0059] S1) Mix low - grade asphalt heated to 180 °C, a modifier, and a co - solvent in proportion to obtain a pre - swollen material;

[0060] S2) After subjecting the pre - swollen material to high - speed shearing, add a stabilizer and stir for development to obtain high - modulus modified asphalt;

[0061] S3) The high - modulus modified asphalt is allowed to stand for development and defoamed to obtain the finished product.

[0062] According to an embodiment of the present invention, in step S1), the co - solvent is selected from Mantec plasticizer, and the Mantec plasticizer has the meaning as described above.

[0063] According to an embodiment of the present invention, in step S1), the swelling conditions include: swelling temperature is 170 - 190 °C, preferably 170 - 175 °C; stirring rate is 300 - 1000 r / min, preferably 500 - 800 r / min; development time is 0.5 - 2 h, preferably 45 min - 1 h.

[0064] According to an embodiment of the present invention, in step S2), the stirring conditions include: shearing temperature is 170 - 190 °C, preferably 180 - 185 °C; shearing rate is 3000 - 5000 r / min, preferably 4000 r / min; shearing time is 1 - 5 h, preferably 2 - 4 h.

[0065] According to an embodiment of the present invention, in step S2), the development conditions include: temperature is 170 - 190 °C, preferably 175 - 185 °C; development stirring rate is 500 - 1500 r / min, preferably 800 - 1200 r / min; development time is 2 - 10 h, preferably 4 - 8 h.

[0066] The present invention also provides the application of the above high-modulus asphalt in pavement materials and / or long-life pavements.

[0067] Preferably, the raw materials of the pavement material contain the above high-modulus asphalt.

[0068] Preferably, the long-life pavement contains the above pavement material and / or the above high-modulus asphalt.

[0069] Beneficial effects:

[0070] The present invention provides a preparation method of high-modulus asphalt, which can not only improve the modulus of asphalt, but also further maintain and improve the durability and anti-aging ability.

[0071] The inventor found that the SBS modifier is relatively mature in road applications and has good high and low temperature properties, but its compatibility and anti-aging properties with asphalt are not prominent. The molecular weight of SIS is higher than that of SBS, and the "hard segment" content in the molecular structure is higher, having relatively better modulus; SEBS has good anti-aging properties. Therefore, after mixing SIS, SEBS or SEPS with SBS, the service life of asphalt is doubled, which is more suitable for long-life pavements. Specific embodiments

[0072] The technical solutions of the present invention will be further described in detail below with reference to specific embodiments. It should be understood that the following embodiments are only for illustrative explanation of the present invention and should not be construed as limiting the protection scope of the present invention. All technologies implemented based on the above content of the present invention are covered within the scope of protection intended by the present invention.

[0073] Unless otherwise specified, the raw materials and reagents used in the following embodiments are all commercially available products or can be prepared by known methods; the parts are in weight parts in the absence of different markings.

[0074] Example 1

[0075] Based on 100 parts by weight of No. 40 asphalt, the formula of the high-modulus asphalt is as follows:

[0076] No. 40 asphalt (penetration 38 dmm, Ic = 0.31), sourced from Shandong Jingbo Petrochemical Co., Ltd., 100 parts by weight;

[0077] SBS modifier (linear SBS, molecular weight of 110,000, block ratio of 30 / 70, Yueyang Baling Petrochemical 791-HSBS), 4 parts by weight;

[0078] SIS modifier (linear SIS, block ratio of 15 / 85, Yueyang Baling Petrochemical 1105SIS), 2 parts by weight;

[0079] The cosolvent is selected from Mantek No. 5 aromatic hydrocarbon plasticizer (FTZSJ-Ⅲ), 0.8 parts by weight;

[0080] The stabilizer is Runfeng Boyue HMD-1 asphalt stabilizer, 0.3 parts by weight.

[0081] The preparation method of the high modulus asphalt is as follows:

[0082] S1) Heat 100 parts of No. 40 asphalt to 170 °C, add 4 parts by weight of SBS modifier and 2 parts by weight of SIS modifier, and stir at 500 r / min for 1 h to obtain a pre-swollen material;

[0083] S2) Keep the pre-swollen material in S1) at 180-185 °C, shear it with a shear machine at 4000 r / min for 2 h, then transfer it to a stirrer, and stir and develop at 180-185 °C and 1000 r / min for 4 h to obtain high modulus modified asphalt;

[0084] S3) After defoaming the high modulus modified asphalt in an oven at 165 °C, obtain the finished product T-1#, and detect the product indexes.

[0085] Example 2

[0086] Based on every 100 parts by weight of No. 40 asphalt, the formula of the high modulus asphalt in this example is as follows:

[0087] No. 40 asphalt (penetration 38 dmm, Ic = 0.31), sourced from Shandong Jingbo Petrochemical Co., Ltd., 100 parts by weight;

[0088] SBS modifier (linear SBS, molecular weight 110,000, block ratio 40 / 60, is Yueyang Baling Petrochemical 791SBS), 4 parts by weight;

[0089] SEPS modifier (linear SEPS, styrene content 30%, is Yueyang Baling Petrochemical 4053SEPS), 2 parts by weight;

[0090] The cosolvent is selected from Mantek No. 5 aromatic hydrocarbon plasticizer (FTZSJ-Ⅲ), 0.8 parts by weight;

[0091] The stabilizer is Runfeng Boyue HMD-1 asphalt stabilizer, 0.3 parts by weight.

[0092] The high modulus modified asphalt finished product prepared by referring to the preparation method of Example 1 with the formula of this example is T-2#.

[0093] Example 3

[0094] Based on every 100 parts by weight of No. 40 asphalt, the formula of the high modulus asphalt in this example is as follows:

[0095] 40# asphalt (penetration 38 dmm, Ic = 0.31), sourced from Shandong Jingbo Petrochemical Co., Ltd., 100 parts by weight;

[0096] SBS modifier (linear SBS, molecular weight 250,000, block ratio 40 / 60, Yueyang Baling Petrochemical 791 SBS), 5 parts by weight;

[0097] SEBS modifier (linear SEBS, styrene content 35%, Ningbo Keyuan CH520 SEBS), 2 parts by weight;

[0098] The co - solvent is selected from Mantek No. 5 aromatic plasticizer (FTZSJ - Ⅲ), 1.0 part by weight;

[0099] The stabilizer is Runfeng Boyue HMD - 1 asphalt stabilizer, 0.3 part by weight.

[0100] The high - modulus modified asphalt product prepared according to the formulation of this example with reference to the preparation method of Example 1 is T - 3#.

[0101] Example 4

[0102] Based on every 100 parts by weight of 40# asphalt, the formulation of the high - modulus asphalt in this example is as follows:

[0103] 40# asphalt (penetration 38 dmm, Ic = 0.31), sourced from Shandong Jingbo Petrochemical Co., Ltd., 100 parts by weight;

[0104] SBS modifier (linear SBS, molecular weight 250,000, block ratio 40 / 60, Yueyang Baling Petrochemical 791 SBS), 4 parts by weight;

[0105] SEBS modifier (linear SEBS, styrene content 35%, Ningbo Keyuan CH520 SEBS), 1 part by weight;

[0106] SIS modifier (linear SIS, block ratio 15 / 85, Yueyang Baling Petrochemical 1105 SIS), 1 part by weight;

[0107] The co - solvent is selected from Mantek No. 5 aromatic plasticizer (FTZSJ - Ⅲ), 0.8 part by weight;

[0108] The stabilizer is Runfeng Boyue HMD - 1 asphalt stabilizer, 0.3 part by weight.

[0109] The high - modulus modified asphalt product prepared according to the formulation of this example with reference to the preparation method of Example 1 is T - 4#.

[0110] Comparative Example 1

[0111] Based on every 100 parts by weight of asphalt No. 40, the formulation of the high-modulus asphalt is as follows:

[0112] Asphalt No. 40 (penetration 38 dmm, Ic = 0.48), sourced from Shandong Jingbo Petrochemical Co., Ltd., 100 parts by weight;

[0113] SEBS modifier (linear SEBS, styrene content 35%, is Ningbo Keyuan CH520 SEBS), 5 parts by weight;

[0114] SBS modifier (linear SBS, molecular weight 110,000, block ratio 30 / 70, is Yueyang Baling Petrochemical 791-HSBS), 1 part by weight;

[0115] The co-solvent is selected from Mantek No. 5 aromatic plasticizer (FTZSJ-Ⅲ), 0.8 part by weight;

[0116] The stabilizer is Runfeng Boyue HMD-1 asphalt stabilizer, 0.3 part by weight.

[0117] The preparation method of the high-modulus asphalt is as follows:

[0118] S1) Heat 100 parts of asphalt No. 40 to 170 °C, add 2 parts of SBS and 4 parts of SEBS modifier, and stir at 500 r / min for 1 h to obtain a pre-swelling material;

[0119] S2) Keep the pre-swelling material in S1) at 180 - 185 °C, shear it with a shear machine at 4000 r / min for 2 h, then transfer it to a stirrer, and stir and develop at 180 - 185 °C and 1000 r / min for 4 h to obtain high-modulus modified asphalt;

[0120] S3) After defoaming the high-modulus modified asphalt in an oven at 165 °C, obtain the finished product C-1#, and detect the product indexes.

[0121] Comparative Example 2

[0122] Based on every 100 parts by weight of asphalt No. 40, the formulation of the high-modulus asphalt is as follows:

[0123] Asphalt No. 40 (penetration 38 dmm, Ic = 0.48), sourced from Shandong Jingbo Petrochemical Co., Ltd., 100 parts by weight;

[0124] SBS modifier (linear SBS, molecular weight 110,000, block ratio 30 / 70, is Yueyang Baling Petrochemical 791-HSBS), 6 parts by weight;

[0125] The co-solvent is selected from Mantek No. 5 aromatic plasticizer (FTZSJ-Ⅲ), 0.8 part by weight;

[0126] The stabilizer is Runfeng Boyue HMD-1 asphalt stabilizer, 0.3 parts by weight.

[0127] The preparation method of the high-modulus asphalt is as follows:

[0128] S1) Heat 100 parts of No. 40 asphalt to 170 °C, add 6 parts of SBS modifier, and stir at 500 r / min for 1 h to obtain a pre-swelling material;

[0129] S2) Keep the pre-swelling material in S1) at 180 - 185 °C, shear it with a shearing machine at 4000 r / min for 2 h, then transfer it to a stirrer, and stir and develop at 1000 r / min at 180 - 185 °C for 4 h to obtain high-modulus modified asphalt;

[0130] S3) After defoaming the high-modulus modified asphalt in an oven at 165 °C, obtain the finished product C-2#, and detect the product indexes.

[0131] Take the asphalt products prepared in the above examples and comparative examples, and test them according to the performance detection method shown in Table 1. The test results are recorded in Table 2.

[0132] Table 1 Performance Detection Method of Asphalt Products

[0133] Index Unit Testing Method Softening Point ℃ JTG E20 T0606 Penetration (25℃, 100g) dmm JTG E20 T0604 Complex Modulus G* at 60℃ Kpa JTG E20 T0628 Difference in Complex Modulus at 60℃ after RTFOT Aging Kpa JTG E20 T0628 Fatigue Factor at 28℃, G*×sinδ / JTG E20 T0628

[0134] Table 2 Performance Detection Results of Asphalt Products

[0135]

[0136] The present invention uses the fatigue factor to characterize the durability of asphalt. The smaller the value at the same temperature, the better the fatigue resistance; the aging ductility and the aging complex modulus difference are used to characterize the anti-aging performance of asphalt. The larger the aging ductility, the better, and the smaller the aging complex modulus difference, the better. From the results in Table 2, it can be seen that the raw material combination method in the examples of the present invention not only improves the modulus of asphalt, but also further improves the durability and anti-aging ability of asphalt.

[0137] The above has described the exemplary embodiments of the present invention. However, the protection scope of this application is not limited to the above embodiments. Any modifications, equivalent replacements, improvements, etc. made by those skilled in the art within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A high-modulus asphalt, characterized in that, Based on every 100 parts by weight of the low-grade asphalt, the raw materials of the high-modulus asphalt are composed of the following components: 100 parts by weight of low-grade asphalt, 1-10 parts by weight of modifier, 0.2-0.4 parts by weight of stabilizer, 0.1-2 parts by weight of cosolvent; The penetration of the low-grade asphalt is 30-40 dmm, the softening point of the low-grade asphalt is 50-60 °C, and the colloidal instability index Ic of the low-grade asphalt ranges from 0.1 to 0.4; The modifier is selected from at least one of SBS modifier, SIS modifier, SEBS modifier, and SEPS modifier; The technical indexes of the high-modulus asphalt include: 1) Softening point: 85-99 °C; 2) Penetration: 30-40 dmm; 3) Complex modulus at 60 °C: 15-30 KPa; 4) Fatigue factor: 2500-4500; 5) RTFOT aging ductility: 10-30 cm.

2. The high-modulus asphalt according to claim 1, wherein The colloidal instability index Ic of the low-grade asphalt ranges from 0.15 to 0.4; and / or, the flash point of the low-grade asphalt is 250-310 °C; and / or, the low-grade asphalt is selected from straight-run low-grade asphalt or blended low-grade asphalt; and / or, the stabilizer is selected from Runfeng Boyue HMD-1 asphalt stabilizer; and / or, the cosolvent is selected from Mantek plasticizer.

3. The high modulus asphalt according to claim 1, wherein The penetration of the low-grade asphalt is 30-40 dmm, the colloidal instability index Ic of the low-grade asphalt ranges from 0.15 to 0.35, and the softening point of the low-grade asphalt is 50-60 °C.

4. The high-modulus asphalt according to claim 1, wherein The SBS modifier is selected from linear or star-shaped SBS thermoplastic elastomers; and / or, the SIS modifier is selected from linear styrene-isoprene-styrene block copolymers; and / or, the SEBS modifier is selected from linear or star-shaped styrene-ethylene / butadiene-styrene block copolymers; and / or, the SEPS modifier is selected from linear or star-shaped hydrogenated styrene-isoprene thermoplastic elastomers.

5. The high modulus asphalt according to claim 1, characterized in that, The molecular weight of the SBS modifier is 100,000-300,000; and / or, the block ratio of the SBS modifier is 30 / 70-40 / 60; and / or, the molecular weight of the SIS modifier is 30,000-300,000; and / or, the block ratio of the SIS modifier is 15 / 85-30 / 70; and / or, the molecular weight of the SEBS modifier is 100,000-250,000; and / or, the styrene content of the SEBS modifier is 30-35%; and / or, the molecular weight of the SEPS modifier is 100,000-250,000; and / or, the hydrogenated styrene content of the SEPS modifier is 30-35%.

6. The preparation method of the high-modulus asphalt according to any one of claims 1-5, characterized in that, The preparation method includes the following steps: S1) Mix the low-grade asphalt, modifier, and cosolvent heated to 180 °C in proportion to obtain a pre-swelling material; S2) After subjecting the pre-swelling material to high-speed shearing, add the stabilizer and stir for development to obtain high-modulus modified asphalt; S3) The high-modulus modified asphalt is allowed to stand for development and defoamed to obtain the finished product.

7. The preparation method according to claim 6, characterized in that In step S1), the swelling conditions include: temperature is 170 - 190 °C; stirring rate is 300 - 1000 r / min; development time is 0.5 - 2 h.

8. The preparation method according to claim 6, characterized in that, In step S2), the stirring conditions include: shear temperature is 170 - 190 °C; shear rate is 3000 - 5000 r / min; shear time is 1 - 5 h.

9. The preparation method according to claim 6, wherein, In step S2), the development conditions include: temperature is 170 - 190 °C; development stirring rate is 500 - 1500 r / min; development time is 2 - 10 h.

10. Application of the high-modulus asphalt according to any one of claims 1 - 5 in pavement materials.

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