Crack pouring adhesive for repairing asphalt pavement cracks and preparation method of crack pouring adhesive

Abstract

The invention relates to the technical field of pouring sealants, in particular to a crack pouring sealant for repairing asphalt pavement cracks and a preparation method of the crack pouring sealant. The crack pouring adhesive for repairing the asphalt pavement cracks is mainly prepared from the following raw materials in parts by weight: 48 to 55 parts of SBS (Styrene Butadiene Styrene) modified asphalt, 48 to 55 parts of rubber modified asphalt, 2 to 4 parts of dioctyl phthalate and 19 to 23 parts of talcum powder, the SBS modified asphalt is mainly prepared from the following raw materials in parts by weight: 5 to 8 parts of styrene-butadiene-styrene block copolymer, 1 to 3 parts of compatilizer, 0.1 to 0.3 part of stabilizer and 90 to 95 parts of matrix asphalt, the rubber modified asphalt is mainly prepared from the following raw materials in parts by weight: 18 to 22 parts of rubber powder, 1 to 3 parts of compatilizer, 0.1 to 0.3 part of stabilizer and 76 to 80 parts of matrix asphalt. The high-performance pouring sealant is prepared at low cost, has a good repairing effect and is not easy to crack.

Description

Technical Field

[0001] The present invention relates to the technical field of potting adhesives, in particular to a crack-sealing adhesive for repairing asphalt pavement cracks and a preparation method thereof. Background Art

[0002] Asphalt roads will develop cracks under the influence of various factors such as pavement structure, climate, terrain, geological conditions, and traffic development. Initial cracks have no obvious impact on the service performance of asphalt pavement. However, with the intrusion of surface rainwater, the damage to the pavement in the cracked state becomes increasingly serious, increasing the water content of the subgrade near the cracks, even to saturation. Under the action of vehicle loads, situations such as settlement and pumping occur, resulting in a significant increase in subsequent maintenance costs. This seriously affects the durability and driving comfort of asphalt pavement.

[0003] Currently, using crack-sealing adhesives to treat pavement cracks is the optimal treatment method in pavement maintenance measures and is also the most common and cost-effective treatment means among various pavement preventive maintenance methods. In the actual process of crack-sealing adhesives, the quality of crack-sealing directly determines the effect of pavement preventive maintenance. Some asphalt pavements will crack again after being repaired with crack-sealing adhesives, increasing the maintenance cost of the pavement. Therefore, it is necessary to develop high-performance crack-sealing adhesive materials with better repair effects and lower costs to meet the current needs of asphalt pavement maintenance. Summary of the Invention

[0004] The purpose of the present invention is to provide a crack-sealing adhesive for repairing asphalt pavement cracks and a preparation method thereof, which can produce high-performance potting adhesives at low cost and have good repair effects and are not prone to cracking.

[0005] The technical solution adopted by the present invention to solve its technical problems is:

[0006] A crack-sealing adhesive for repairing asphalt pavement cracks is mainly composed of the following raw materials in parts by weight: 48 - 55 parts of SBS modified asphalt, 48 - 55 parts of rubber modified asphalt, 2 - 4 parts of dioctyl phthalate (DOP), and 19 - 23 parts of talcum powder. Among them, the SBS modified asphalt is mainly composed of the following raw materials in parts by weight: 5 - 8 parts of styrene-butadiene-styrene block copolymer (SBS), 1 - 3 parts of compatibilizer, 0.1 - 0.3 parts of stabilizer, and 90 - 95 parts of matrix asphalt; the rubber modified asphalt is mainly composed of the following raw materials in parts by weight: 18 - 22 parts of rubber powder, 1 - 3 parts of compatibilizer, 0.1 - 0.3 parts of stabilizer, and 76 - 80 parts of matrix asphalt.

[0007] Preferably, a crack-sealing adhesive for repairing asphalt pavement cracks is mainly composed of the following raw materials in parts by weight: 50 parts of SBS modified asphalt, 50 parts of rubber modified asphalt, 2 parts of dioctyl phthalate (DOP), and 19 parts of talcum powder.

[0008] Preferably, the SBS modified asphalt is mainly composed of the following raw materials in parts by weight: 6 parts of styrene-butadiene-styrene block copolymer (SBS), 2 parts of compatibilizer, 0.2 part of stabilizer, and 93.8 parts of base asphalt.

[0009] Preferably, the rubber modified asphalt is mainly composed of the following raw materials in parts by weight: 20 parts of rubber powder, 2 parts of compatibilizer, 0.2 part of stabilizer, and 77.8 parts of base asphalt.

[0010] Preferably, the base asphalt is Jingbo No. 70 base asphalt.

[0011] Preferably, the penetration of the base asphalt is (60 - 80) / 0.1 mm, the ductility at 10 °C is greater than 20 cm, and the softening point is greater than 46 °C.

[0012] Preferably, the rubber powder is 60-mesh raw rubber powder, and the relative density of the rubber powder is 1.25 g / m 3 , and the moisture content is 0.31 wt%.

[0013] Preferably, the talc powder is 625-mesh.

[0014] Preferably, the preparation method of the SBS modified asphalt comprises the following steps:

[0015] Weigh 5 - 8 parts of ethylene-butadiene-styrene block copolymer, 1 - 3 parts of compatibilizer, and 0.1 - 0.3 part of stabilizer according to the specified parts by weight;

[0016] Heat the base asphalt to 135 ± 5 °C, take out 90 - 95 parts of the base asphalt, add 1 - 3 parts of compatibilizer, stir at a speed of 30 - 50 r / min and heat to 180 ± 5 °C to obtain dispersion base one;

[0017] Add 5 - 8 parts of ethylene-butadiene-styrene block copolymer to dispersion base one, shear with a high-speed shearer for 30 ± 5 min, and the shear speed is 4000 ± 500 r / min to obtain mixture one;

[0018] Stir the mixture one after high-speed shearing at a speed of 400 ± 50 r / min, add 0.1 - 0.3 part of stabilizer, stir for 60 ± 5 min, and naturally cool to room temperature to obtain the finished SBS modified asphalt.

[0019] Preferably, the preparation method of the rubber modified asphalt comprises the following steps:

[0020] Weigh 18 - 22 parts of rubber powder, 1 - 3 parts of compatibilizer, and 0.1 - 0.3 part of stabilizer according to the specified parts by weight;

[0021] Heat the base asphalt to 135 ± 5 °C, take out 76 - 80 parts, add 1 - 3 parts of compatibilizer, stir at a speed of 40 ± 5 r / min and heat to 180 ± 5 °C to obtain Dispersed Base Two;

[0022] Add 18 - 22 parts of rubber powder to Dispersed Base Two, shear with a high - speed shearer for 30 ± 5 min, and the shear speed is 4000 ± 500 r / min to obtain Mixture Two;

[0023] After the high - speed shearing is completed, stir the Mixture Two at a rotation speed of 400 ± 50 r / min, add 0.1 - 0.3 parts of stabilizer, stir for 120 ± 10 min, and after natural cooling to room temperature, the finished rubber - modified asphalt is obtained.

[0024] A preparation method of a crack - repairing sealant for asphalt pavement includes the following steps:

[0025] Weigh 48 - 55 parts of SBS - modified asphalt, 48 - 55 parts of rubber - modified asphalt, 2 - 4 parts of dioctyl phthalate, and 19 - 23 parts of talcum powder according to the specified weight parts;

[0026] Heat the specified weight parts of SBS - modified asphalt and rubber - modified asphalt to 165 ± 5 °C, and stir at a speed of 400 ± 100 r / min for 30 ± 5 min under the temperature condition of 165 ± 5 °C to obtain composite - modified asphalt;

[0027] Add the specified weight parts of DOP to the composite - modified asphalt, keep at 180 ± 5 °C, and stir at a speed of 400 ± 100 r / min for 30 ± 5 min;

[0028] Add the specified weight parts of talcum powder, and continue to stir at a speed of 400 ± 100 r / min for 30 ± 5 min under the temperature condition of 180 ± 5 °C to obtain the product.

[0029] The beneficial effects of the present invention are: Compared with the prior art, a crack - repairing sealant for asphalt pavement and its preparation method of the present invention have the following advantages: low cost, simple preparation method, good physical properties of the prepared sealant, and good repair effect and not easy to crack during actual application. Description of the Drawings

[0030] Figure 1 Picture for Example 1 after construction;

[0031] Figure 2 Picture for Example 2 after construction;

[0032] Figure 3 Picture for Example 3 after construction, and after 15 minutes, the local area is rolled by a heavy - duty vehicle. Detailed Description of the Invention

[0033] Example 1

[0034] A crack-sealing adhesive for asphalt pavement repair is mainly composed of the following raw materials in parts by weight: 50 parts of SBS-modified asphalt, 50 parts of rubber-modified asphalt, 4 parts of DOP, and 19 parts of talcum powder; the SBS-modified asphalt is mainly composed of the following raw materials in parts by weight: 6 parts of styrene-butadiene-styrene block copolymer (SBS), 2 parts of compatibilizer, 0.2 part of stabilizer, and 93.8 parts of base asphalt; the rubber-modified asphalt is mainly composed of the following raw materials in parts by weight: 20 parts of rubber powder, 2 parts of compatibilizer, 0.2 part of stabilizer, and 77.8 parts of base asphalt.

[0035] The base asphalt is Jingbo No. 70 base asphalt, and the penetration of the base asphalt is (60 - 80) / 0.1mm, the ductility at 10°C is greater than 20 cm, and the softening point is greater than 46°C.

[0036] The rubber powder is 60-mesh raw rubber powder, and the relative density of the rubber powder is 1.25 g / m 3 , and the moisture content is 0.31 wt%.

[0037] The talcum powder is 625-mesh.

[0038] The stabilizer is purchased from Shijiazhuang Junlong Chemical Products Sales Co., Ltd. and is an emulsified asphalt stabilizer JL-865.

[0039] The compatibilizer is aromatic oil.

[0040] The preparation method of the SBS-modified asphalt includes the following steps:

[0041] Weigh 6 parts of SBS, 2 parts of compatibilizer, and 0.2 part of stabilizer according to the specified parts by weight;

[0042] Heat the base asphalt to 135°C, take out 93.8 parts of the base asphalt, add 2 parts of compatibilizer, stir at a speed of 40 r / min and heat to 180°C to obtain dispersion base one;

[0043] Add 6 parts of SBS to dispersion base one, shear with a high-speed shearer for 305 min at a shear speed of 4000 r / min to obtain mixture one;

[0044] Stir the mixture one after high-speed shearing at a rotation speed of 400 r / min, add 0.2 part of stabilizer, stir for 60 min, and naturally cool to room temperature to obtain the finished product of SBS-modified asphalt.

[0045] The preparation method of the rubber-modified asphalt includes the following steps:

[0046] Weigh 20 parts of rubber powder, 2 parts of compatibilizer, and 0.2 parts of stabilizer according to the specified weight parts;

[0047] Heat the base asphalt to 135 °C, take out 77.8 parts, add 2 parts of compatibilizer, stir at a speed of 40 r / min and heat to 180 °C to obtain dispersion base two;

[0048] Add 20 parts of rubber powder to dispersion base two, shear with a high-speed shearer for 30 min at a shear speed of 4000 r / min to obtain mixture two;

[0049] After the high-speed shearing is completed, stir the mixture two at a rotation speed of 400 r / min, add 0.2 parts of stabilizer, stir for 120 min, and naturally cool to room temperature to obtain the finished rubber-modified asphalt.

[0050] The preparation method of the crack repair sealant for asphalt pavement in this example includes the following steps:

[0051] Weigh 50 parts of SBS modified asphalt, 50 parts of rubber modified asphalt, 4 parts of DOP, and 19 parts of talcum powder according to the specified weight parts;

[0052] Heat the specified weight parts of SBS modified asphalt and rubber modified asphalt to 165 °C, stir at a speed of 400 r / min for 30 min under the temperature condition of 165 °C to obtain the composite modified asphalt;

[0053] Add the specified weight parts of DOP to the composite modified asphalt, keep at 180 °C, and stir at a speed of 400 r / min for 30 min;

[0054] Add the specified weight parts of talcum powder, continue to stir at a speed of 400 r / min for 30 min under the temperature condition of 180 °C to obtain the product.

[0055] Example 2

[0056] A crack repair sealant for asphalt pavement mainly consists of the following raw materials in weight parts: 50 parts of SBS modified asphalt, 50 parts of rubber modified asphalt, 2 parts of DOP, and 21 parts of talcum powder. Among them, the SBS modified asphalt mainly consists of the following raw materials in weight parts: 6 parts of SBS, 2 parts of compatibilizer, 0.2 parts of stabilizer, and 93.8 parts of base asphalt; the rubber modified asphalt mainly consists of the following raw materials in weight parts: 20 parts of rubber powder, 2 parts of compatibilizer, 0.2 parts of stabilizer, and 77.8 parts of base asphalt.

[0057] The base asphalt is Jingbo No. 70 base asphalt. The penetration of the base asphalt is (60 - 80) / 0.1 mm, the ductility at 10 °C is greater than 20 cm, and the softening point is greater than 46 °C.

[0058] The rubber powder is 60-mesh raw rubber powder, and the relative density of the rubber powder is 1.25 g / m 3 , and the moisture content is 0.31 wt%.

[0059] The talcum powder is 625-mesh.

[0060] The stabilizer is purchased from Shijiazhuang Junlong Chemical Products Sales Co., Ltd. and is the emulsified asphalt stabilizer JL-865.

[0061] The compatibilizer is aromatic oil.

[0062] The preparation method of the SBS modified asphalt includes the following steps:

[0063] Weigh 6 parts of SBS, 2 parts of compatibilizer, and 0.2 part of stabilizer according to the specified weight parts;

[0064] Heat the base asphalt to 135°C, take out 93.8 parts of the base asphalt, add 2 parts of compatibilizer, stir at a speed of 40 r / min and heat to 180°C to obtain Dispersion Base 1;

[0065] Add 6 parts of SBS to Dispersion Base 1, and shear with a high-speed shearer for 305 min at a shear speed of 4000 r / min to obtain Mixture 1;

[0066] Stir the Mixture 1 after high-speed shearing at a rotation speed of 400 r / min, add 0.2 part of stabilizer, stir for 60 min, and naturally cool to room temperature to obtain the finished SBS modified asphalt.

[0067] The preparation method of the rubber modified asphalt includes the following steps:

[0068] Weigh 20 parts of rubber powder, 2 parts of compatibilizer, and 0.2 part of stabilizer according to the specified weight parts;

[0069] Heat the base asphalt to 135°C, take out 77.8 parts, add 2 parts of compatibilizer, stir at a speed of 40 r / min and heat to 180°C to obtain Dispersion Base 2;

[0070] Add 20 parts of rubber powder to Dispersion Base 2, and shear with a high-speed shearer for 30 min at a shear speed of 4000 r / min to obtain Mixture 2;

[0071] Stir the Mixture 2 after high-speed shearing at a rotation speed of 400 r / min, add 0.2 part of stabilizer, stir for 120 min, and naturally cool to normal temperature to obtain the finished rubber modified asphalt.

[0072] The preparation method of the crack repair grouting adhesive for asphalt pavement in this embodiment includes the following steps:

[0073] Weigh 50 parts of SBS modified asphalt, 50 parts of rubber modified asphalt, 2 parts of DOP, and 21 parts of talcum powder according to the specified weight parts;

[0074] Heat the specified weight parts of SBS modified asphalt and rubber modified asphalt to 165 °C, and stir at a speed of 400 r / min for 30 min under the temperature condition of 165 °C to obtain composite modified asphalt;

[0075] Add the specified weight parts of DOP to the composite modified asphalt, keep it at 180 °C, and stir at a speed of 400 r / min for 30 min;

[0076] Add the specified weight parts of talcum powder, and continue to stir at a speed of 400 r / min for 30 min under the temperature condition of 180 °C to obtain the product.

[0077] Example 3

[0078] A crack-sealing adhesive for asphalt pavement repair mainly consists of the following raw materials in weight parts: 50 parts of SBS modified asphalt, 50 parts of rubber modified asphalt, 2 parts of DOP, and 19 parts of talcum powder. Among them, the SBS modified asphalt mainly consists of the following raw materials in weight parts: 6 parts of styrene-butadiene-styrene block copolymer (SBS), 2 parts of compatibilizer, 0.2 part of stabilizer, and 93.8 parts of base asphalt; the rubber modified asphalt mainly consists of the following raw materials in weight parts: 20 parts of rubber powder, 2 parts of compatibilizer, 0.2 part of stabilizer, and 77.8 parts of base asphalt.

[0079] The base asphalt is Jingbo No. 70 base asphalt. The penetration of the base asphalt is (60 - 80) / 0.1 mm, the ductility at 10 °C is greater than 20 cm, and the softening point is greater than 46 °C.

[0080] The rubber powder is 60-mesh raw rubber powder, and the relative density of the rubber powder is 1.25 g / m 3 , and the moisture content is 0.31 wt%.

[0081] The talcum powder is 625-mesh.

[0082] The stabilizer is purchased from Shijiazhuang Junlong Chemical Products Sales Co., Ltd. and is an emulsified asphalt stabilizer JL-865.

[0083] The compatibilizer is aromatic oil.

[0084] The preparation method of the SBS modified asphalt includes the following steps:

[0085] Weigh 6 parts of SBS, 2 parts of compatibilizer, and 0.2 part of stabilizer according to the specified weight parts;

[0086] Heat the base asphalt to 135°C, take out 93.8 parts of the base asphalt, add 2 parts of compatibilizer, stir at a speed of 40 r / min and heat to 180°C to obtain Dispersion Base 1;

[0087] Add 6 parts of SBS to Dispersion Base 1, shear with a high-speed shearer for 305 min at a shear speed of 4000 r / min to obtain Mixture 1;

[0088] Stir the Mixture 1 after high-speed shearing at a speed of 400 r / min, add 0.2 part of stabilizer, stir for 60 min, and naturally cool to room temperature to obtain the finished SBS modified asphalt.

[0089] The preparation method of the rubber modified asphalt comprises the following steps:

[0090] Weigh 20 parts of rubber powder, 2 parts of compatibilizer, and 0.2 part of stabilizer according to the specified weight parts;

[0091] Heat the base asphalt to 135°C, take out 77.8 parts, add 2 parts of compatibilizer, stir at a speed of 40 r / min and heat to 180°C to obtain Dispersion Base 2;

[0092] Add 20 parts of rubber powder to Dispersion Base 2, shear with a high-speed shearer for 30 min at a shear speed of 4000 r / min to obtain Mixture 2;

[0093] Stir the Mixture 2 after high-speed shearing at a speed of 400 r / min, add 0.2 part of stabilizer, stir for 120 min, and naturally cool to normal temperature to obtain the finished rubber modified asphalt.

[0094] The preparation method of the crack repair sealant for asphalt pavement in this embodiment comprises the following steps:

[0095] Weigh 50 parts of SBS modified asphalt, 50 parts of rubber modified asphalt, 2 parts of DOP, and 19 parts of talcum powder according to the specified weight parts;

[0096] Heat the specified weight parts of SBS modified asphalt and rubber modified asphalt to 165°C, and stir at a speed of 400 / min for 30 min under the condition of 165°C to obtain the composite modified asphalt;

[0097] Add the specified weight parts of DOP to the composite modified asphalt, keep at 180°C, and stir at a speed of 400 r / min for 30 min;

[0098] Add the specified weight parts of talcum powder, and continue to stir at a speed of 400 r / min under the condition of 180°C for 30 min to obtain.

[0099] Experimental Example 1

[0100] The performance of the crack sealants prepared in Examples 1 - 3 was tested. The test evaluation was carried out according to the relevant tests in "Pavement Heating Type Sealant" (JT / T 740 - 2015). The performance indexes of the crack sealants are shown in Table 1 as follows:

[0101] Table 1 Basic Physical Performance Indexes of Crack Sealants

[0102]

[0103] Experimental Example 2

[0104] The sealants prepared in Examples 1 - 3 were applied to the repair of asphalt pavement cracks. As Figures 1-3 shown, the subsequent cracking situation was continuously observed. The observation results are shown in Table 2 as follows:

[0105] Table 2 Observation Results of Cracking Situation after Pavement Crack Sealing Repair

[0106]

[0107] The above - mentioned specific implementation manners are only specific cases of the present invention. The patent protection scope of the present invention includes but is not limited to the product forms and styles of the above - mentioned specific implementation manners. Any appropriate changes or modifications made by any person skilled in the art who conforms to the claims of the present invention shall fall within the patent protection scope of the present invention.

Claims

1. A crack filling glue for repairing cracks in asphalt pavement, characterized by: The invention mainly consists of the following raw materials in parts by weight: 48-55 parts of SBS modified asphalt, 48-55 parts of rubber modified asphalt, 2-4 parts of dioctyl phthalate and 19-23 parts of talc. The SBS modified asphalt mainly consists of the following raw materials in parts by weight: 5-8 parts of styrene-butadiene-styrene block copolymer, 1-3 parts of compatibilizer, 0.1-0.3 parts of stabilizer and 90-95 parts of base asphalt; the rubber modified asphalt mainly consists of the following raw materials in parts by weight: 18-22 parts of rubber powder, 1-3 parts of compatibilizer, 0.1-0.3 parts of stabilizer and 76-80 parts of base asphalt.

2. The asphalt pavement crack repairing sealant according to claim 1, characterized in that: The invention is mainly composed of the following raw materials in parts by weight: 50 parts of SBS modified asphalt, 50 parts of rubber modified asphalt, 2 parts of dioctyl phthalate and 19 parts of talc.

3. The asphalt pavement crack repairing sealant according to claim 1, characterized in that: The SBS modified asphalt is mainly composed of the following raw materials in parts by weight: 6 parts of styrene-butadiene-styrene block copolymer, 2 parts of a compatibilizer, 0.2 parts of a stabilizer and 93.8 parts of a base asphalt.

4. The asphalt pavement crack repairing sealant according to claim 1, characterized in that: The rubber modified asphalt is mainly composed of the following raw materials in parts by weight: 20 parts of rubber powder, 2 parts of compatibilizer, 0.2 parts of stabilizer and 77.8 parts of base asphalt.

5. The asphalt pavement crack repairing sealant according to claim 1, characterized in that: The base asphalt is Jingbo No. 70 base asphalt.

6. The asphalt pavement crack repairing sealant according to claim 1, characterized in that: The base asphalt has a needle penetration of (60-80) / 0.1mm, an elongation of greater than 20cm at 10°C, and a softening point greater than 46°C.

7. The asphalt pavement crack repairing sealant according to claim 1, characterized in that: The rubber powder is 60 mesh raw rubber powder, and the relative density of the rubber powder is 1.25g / m 3 , moisture content 0.31wt%.

8. The asphalt pavement crack repairing sealant according to claim 1, characterized in that: The preparation method of the SBS modified asphalt comprises the following steps: Weigh 5-8 parts of ethylene-butadiene-styrene block copolymer, 1-3 parts of compatibilizer, and 0.1-0.3 parts of stabilizer according to the specified weight ratio; Heat the base asphalt to 135±5°C, take out 90-95 parts of the base asphalt, add 1-3 parts of the compatibilizer, stir at a speed of 30-50r / min and heat to 180±5°C to obtain a dispersed base 1; Add 5-8 parts of ethylene-butadiene-styrene block copolymer to dispersed base 1, and shear with a high-speed shearing instrument for 30±5 minutes at a shearing speed of 4000±500 r / min to obtain mixture 1; The mixture after high-speed shearing is stirred at a speed of 400±50r / min, 0.1-0.3 parts of stabilizer are added, stirred for 60±5min, and naturally cooled to room temperature to obtain the SBS modified asphalt finished product.

9. The asphalt pavement crack repairing sealant according to claim 1, characterized in that: The preparation method of the rubber modified asphalt comprises the following steps: Weigh 18-22 parts of rubber powder, 1-3 parts of compatibilizer, and 0.1-0.3 parts of stabilizer according to the specified weight ratio; Heat the base asphalt to 135±5°C, take out 76-80 parts, add 1-3 parts of compatibilizer, stir at a speed of 40±5r / min and heat to 180±5°C to obtain dispersed base II; Add 18-22 parts of rubber powder to the dispersion base 2, and use a high-speed shearing instrument to shear for 30±5 minutes at a shearing speed of 4000±500 r / min to obtain a mixture 2; After high-speed shearing, the mixture 2 is stirred at a speed of 400±50r / min, 0.1-0.3 parts of stabilizer are added, stirred for 120±10min, and naturally cooled to room temperature to obtain the rubber modified asphalt product.

10. A method for preparing a crack filling glue for repairing cracks in asphalt pavement according to any one of claims 1 to 9, characterized in that: The steps include: Weigh 48-55 parts of SBS modified asphalt, 48-55 parts of rubber modified asphalt, 2-4 parts of dioctyl phthalate, and 19-23 parts of talc according to the specified weight ratio; Heat the SBS modified asphalt and rubber modified asphalt in the specified weight proportions to 165±5°C, stir at 165±5°C and 400±100 r / min for 30±5 min to obtain a composite modified asphalt; Add the specified weight of DOP into the composite modified asphalt, maintain 180±5℃, stir at 400±100r / min for 30±5min; Add talcum powder in the specified weight proportion, continue stirring at 180±5°C and 400±100r / min for 30±5min.

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