Preparation method of high-viscosity modified emulsified asphalt for steel slag and thin slurry mixture

Abstract

The invention discloses a preparation method of high-viscosity modified emulsified asphalt for a steel slag and thin slurry mixture, and the preparation method comprises a high-viscosity modified asphalt melting step, a soap liquid preparation step and a grinding step, and the high-viscosity modified emulsified asphalt comprises the following components in parts by mass: 60 parts of high-viscosity modified asphalt, 2-3 parts of a slow-breaking and quick-setting cationic emulsifier, 1.5 parts of a stabilizer and 0.1-0.3 part of a water repellent agent. 0.3 to 0.8 part of a pH regulator; and 34.7 to 36.0 parts of water. By adopting the preparation method of the high-viscosity modified emulsified asphalt, on one hand, the influence of poor volume stability of the steel slag on the usability of the thin slurry mixture is reduced, and on the other hand, the performance of the high-viscosity modified emulsified asphalt for the steel slag thin slurry mixture is further improved, so that the usability of the thin slurry mixture is improved, and the service life of the thin slurry mixture is prolonged; and the traffic safety and the full-life-cycle economic benefit of the road are improved.

Description

Technical Field

[0001] The present application belongs to the technical field of road asphalt materials, and specifically, relates to a method for preparing high-viscosity modified emulsified asphalt for steel slag slurry mixture. Background Art

[0002] At present, slurry mixture refers to a slurry mixture formed by mixing emulsified asphalt, coarse and fine aggregates, fillers, water, additives, etc. in a certain proportion. It is often used in pavement preventive maintenance projects such as micro-surfacing and slurry sealing. Generally, it should have excellent anti-skid, wear-resistant and waterproof capabilities.

[0003] However, with the tightening of natural sand and gravel resource constraints and the increasing requirements for environmental protection, high-quality sand and gravel aggregates suitable for slurry mixtures such as micro-surfacing are becoming increasingly scarce. Steel slag has the characteristics of hardness, anti-skid, wear resistance, and excellent mechanical properties, and can be used as a substitute for high-quality aggregates in slurry mixtures. However, steel slag has the problem of poor volume stability during application. The expansive components such as free calcium oxide and magnesium oxide contained in it will react chemically with water to generate Ca(OH)2 and Mg(OH)2, causing volume expansion and leading to cracking and other defects in the mixture.

[0004] In addition, the viscosity of ordinary emulsified asphalt or modified emulsified asphalt is relatively low, and the dynamic viscosity at 60°C basically does not exceed 5000Pa·s. Not only can it not truly bond the aggregates into a whole, but also after the slurry mixture is paved on the road surface to be maintained in the form of a thin layer of 0.3 to 2.5 cm, it cannot be well bonded to the original road surface, resulting in the slurry mixture thin layer becoming loose, peeling and other defects. Summary of the invention

[0005] The technical problem to be solved by the present application is to provide a method for preparing high-viscosity modified emulsified asphalt for steel slag slurry mixture, which, on the one hand, reduces the influence of poor volume stability of steel slag on the performance of the slurry mixture, and on the other hand, further improves the performance of emulsified asphalt for the slurry mixture, thereby improving the performance and service life of the slurry mixture, improving road traffic safety and full life cycle economic benefits.

[0006] In order to solve the above-mentioned problems of the present application, the present application provides a method for preparing high-viscosity modified emulsified asphalt for steel slag slurry mixture, comprising: a high-viscosity modified asphalt melting step, a soap solution preparation step, and a grinding step, wherein the high-viscosity modified emulsified asphalt comprises, by mass: 60 parts of high-viscosity modified asphalt, 2 to 3 parts of slow-cracking and fast-setting cationic emulsifier, 1.5 parts of stabilizer, 0.1 to 0.3 parts of hydrophobic agent, 0.3 to 0.8 parts of pH adjuster, and 34.7 to 36.0 parts of water.

[0007] In order to improve the performance and service life of the slurry mixture through the hydrophobic function and high viscosity characteristics of the high-viscosity modified emulsified asphalt after demulsification, as a preferred method for preparing the high-viscosity modified emulsified asphalt for the steel slag slurry mixture in the present application, the high-viscosity modified asphalt melting step includes: heating the high-viscosity modified asphalt to a molten state at 175°C; the soap solution preparation step includes: determining the mass of the mixed liquid except the emulsifier in the mixed liquid as m1 according to the emulsifier dosage, and obtaining the soap solution; the grinding step includes: adding the soap solution to a colloid mill, and slowly adding the high-viscosity modified asphalt in a molten state to the colloid mill, and forming the high-viscosity modified emulsified asphalt after grinding and dispersion in the colloid mill.

[0008] As a preferred choice for the preparation method of high-viscosity modified emulsified asphalt for the steel slag slurry mixture in the present application, the stabilizer is polyvinyl alcohol, the hydrophobic agent is one of polydimethylsiloxane or octyltriethoxysilane, and the pH adjuster is hydrochloric acid. Among them, the hydrophobic agent polydimethylsiloxane or octyltriethoxysilane used in the present application has good compatibility with asphalt, and the addition of high-viscosity modified emulsified asphalt will not adversely affect the stability of the system.

[0009] In order to obtain high-viscosity modified emulsified asphalt, as a preferred method for preparing high-viscosity modified emulsified asphalt for the steel slag slurry mixture in the present application, before determining the mass of the mixed liquid excluding the emulsifier in the mixed liquid as m1 according to the emulsifier dosage, it also includes: taking 70°C hot water with a mass of 0.8 times m1; slowly adding the emulsifier to the water and stirring continuously; after the emulsifier and water are stirred together, adding hydrochloric acid to adjust the pH value of the mixed liquid to 2~3; adding a hydrophobic agent to the mixed liquid, and continuing to add 70°C hot water.

[0010] As an improvement of the preparation method of the high-viscosity modified emulsified asphalt for the steel slag slurry mixture in the present application, the high-viscosity modified asphalt includes, by mass: 100 parts of base asphalt, 6 to 10 parts of modifier, 0.1 part of sulfur, 1 to 3 parts of furfural extracted oil, and 4 to 15 parts of thickener.

[0011] As a preferred choice of the method for preparing high-viscosity modified emulsified asphalt for the steel slag slurry mixture in the present application, the modifier is YH-791H linear SBS, and the viscosity enhancer is one of C9 resin, TPS additive, and terpene resin.

[0012] As a preferred choice of the method for preparing high-viscosity modified emulsified asphalt for the steel slag slurry mixture in the present application, the base asphalt is 90# base asphalt.

[0013] As a preferred method for preparing the high-viscosity modified emulsified asphalt for the steel slag slurry mixture in the present application, the preparation method of the high-viscosity modified asphalt is: heating the base asphalt to a molten state at 175°C, and adding the furfural extracted oil and the modifier at the same time; after swelling for 20 minutes at 175°C, high-speed shearing at a speed of 4000r / min for 40 minutes; then adding the sulfur at 175°C and stirring at a speed of 120r / min for 2 hours to obtain the high-viscosity modified asphalt.

[0014] The beneficial effects of this application are: 1. The high-viscosity modified emulsified asphalt proposed in the present application is prepared by first modifying and then emulsifying, and has a softening point ≥80°C, an elongation ≥30cm at 5°C, and a dynamic viscosity ≥100,000Pa·s at 60°C. As a binder, it can not only bond aggregates together, but also make the slurry mixture layer and the underlying layer more closely bonded, effectively reducing the possibility of loosening, peeling and other defects in the slurry mixture thin layer.

[0015] 2. The high-viscosity modified emulsified asphalt proposed in this application has excellent hydrophobicity after demulsification. When used in slurry mixture, it can not only effectively isolate water from invading the interior of the aggregate, but also reduce water erosion on the asphalt-aggregate interface, greatly avoiding the occurrence of road surface diseases caused by volume expansion and crushing of aggregates such as steel slag that are easily affected by moisture.

[0016] 3. The hydrophobic agent used in this application is one of polydimethylsiloxane or octyltriethoxysilane, and the dosage is between 0.1 and 0.3 (mass ratio) of the high-viscosity modified emulsified asphalt. The two hydrophobic agents have good compatibility with asphalt, reducing the impact of the addition of admixtures on the storage stability of high-viscosity modified emulsified asphalt. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of a method for preparing a high-viscosity modified emulsified asphalt for steel slag slurry mixture in an embodiment of the present application. DETAILED DESCRIPTION

[0018] The embodiments of the technical solution of the present application will be described in detail below. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application. In addition, the technical features involved in each embodiment of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0019] The present application provides a method for preparing high-viscosity modified emulsified asphalt for steel slag slurry mixture, comprising: a high-viscosity modified asphalt melting step, a soap solution preparation step, and a grinding step, wherein the high-viscosity modified emulsified asphalt comprises, by mass: 60 parts of high-viscosity modified asphalt, 2 to 3 parts of slow-cracking and fast-setting cationic emulsifier, 1.5 parts of stabilizer, 0.1 to 0.3 parts of hydrophobic agent, 0.3 to 0.8 parts of pH adjuster, and 34.7 to 36.0 parts of water.

[0020] Optionally, the stabilizer is polyvinyl alcohol, the hydrophobic agent is one of polydimethylsiloxane or octyltriethoxysilane, and the pH adjuster is hydrochloric acid, wherein the polydimethylsiloxane or the octyltriethoxysilane has good compatibility with the high-viscosity modified emulsified asphalt, reducing the impact of the addition of admixtures on the storage stability of the high-viscosity modified emulsified asphalt.

[0021] In the preparation process of the high viscosity modified emulsified asphalt, reference Figure 1 , specifically including the following steps: S1, high viscosity modified asphalt melting step: heating the high viscosity modified asphalt at 175° C. to a molten state for standby use; S2, soap solution preparation step: according to the amount of emulsifier, the mass of the mixed liquid other than the emulsifier is determined as m1 to obtain soap solution; Among them, before determining that the mass of the mixed liquid other than the emulsifier in the mixed liquid is m1 according to the emulsifier dosage, it also includes: taking 70°C hot water with a mass of 0.8 times m1, slowly adding the emulsifier into the water, and continuously stirring until the emulsifier and the water are integrated, using hydrochloric acid to adjust the pH value of the solution to 2-3, adding the hydrophobic agent, and continuing to add 70°C water to the mixed liquid until the mass of the mixed liquid other than the emulsifier reaches m1, thereby obtaining the soap solution.

[0022] S3, grinding step: adding the soap solution into the cleaned colloid mill, opening the colloid mill, and then slowly adding the molten high-viscosity modified asphalt into the colloid mill at a relatively slow speed, and obtaining the high-viscosity modified emulsified asphalt after grinding and dispersion in the colloid mill.

[0023] As a further improvement of the preparation method of high-viscosity modified emulsified asphalt for steel slag slurry mixture in the present application, the high-viscosity modified asphalt includes, by mass: 100 parts of base asphalt, 6 to 10 parts of modifier, 0.1 part of sulfur, 1 to 3 parts of furfural extracted oil, and 4 to 15 parts of thickener. Optionally, the base asphalt is 90# base asphalt, the modifier is YH-791H linear SBS, and the thickener is one of C9 resin, TPS additive, and terpene resin.

[0024] Among them, the preparation method of the high-viscosity modified asphalt is: heating the base asphalt to a molten state at 175°C, then adding the furfural extracted oil and the modifier at the same time, swelling at 175°C for 20 minutes, and then high-speed shearing the mixture at 4000r / min for 40 minutes at 175°C; then adding the sulfur at 175°C and stirring at 120r / min for 2 hours to obtain the high-viscosity modified asphalt.

[0025] According to the implementation mode provided in the present application, some specific tests have been conducted on the present application, namely, the performance of the high-viscosity modified emulsified asphalt was tested and compared using different dosages of the viscosity enhancer, the modifier, the emulsifier and the hydrophobic agent. On this basis, some comparative examples are also given. From these embodiments and comparative examples, it can be seen that the scheme provided in the present application has achieved better results. It should be noted that the following embodiments are only used to illustrate the present invention in detail and do not limit the scope of protection of the invention in any way.

[0026] Example 1 The high-viscosity modified emulsified asphalt comprises, in parts by mass: 60 parts of the high-viscosity modified asphalt, 2.5 parts of the slow-cracking and fast-setting cationic emulsifier, 1.5 parts of the polyvinyl alcohol, 0.2 parts of the hydrophobic agent, hydrochloric acid to adjust the pH value of the soap solution to 2-3, and the remaining part is made up with water, the hydrophobic agent is polydimethylsiloxane, wherein the high-viscosity modified asphalt comprises, in parts by mass, 100 parts of the 90# base asphalt, 8 parts of the SBS modifier, 0.1 parts of the sulfur, 2 parts of the furfural extracted oil, and 6 parts of the tackifier, and the tackifier is C9 resin.

[0027] S1, the high-viscosity modified asphalt melting step comprises: heating the high-viscosity modified asphalt at 175° C. to a molten state; S2, the soap solution preparation step includes: taking 70°C hot water with a mass of 0.8 times ml, slowly adding the emulsifier into the water, and continuously stirring until the emulsifier and water are integrated, using hydrochloric acid to adjust the pH value of the solution to 2-3, adding the hydrophobic agent, and continuing to add 70°C water to the mixed solution until the mass of the mixed solution excluding the emulsifier reaches m1, thereby obtaining a soap solution.

[0028] S3. The grinding step includes: adding the soap solution into a colloid mill, and slowly adding the high-viscosity modified asphalt in a molten state into the colloid mill, and forming the high-viscosity modified emulsified asphalt after grinding and dispersion in the colloid mill.

[0029] Among them, the preparation method of the high-viscosity modified asphalt is: heating the base asphalt to a molten state at 175°C, and adding the furfural extracted oil and the modifier at the same time; after swelling at 175°C for 20 minutes, high-speed shearing at a speed of 4000r / min for 40 minutes; then adding the sulfur at 175°C and stirring at a speed of 120r / min for 2 hours to obtain the high-viscosity modified asphalt.

[0030] The performance test results of the high-viscosity modified emulsified asphalt obtained in Example 1 are shown in Table 1.

[0031] Embodiments 2 to 9 The same method for preparing high-viscosity modified emulsified asphalt for steel slag slurry mixture as in Example 1 is used, except that the dosages of the viscosity enhancer, the modifier, the emulsifier and the hydrophobic agent are different.

[0032] Example 2 This example is different from Example 1 only in the type and dosage of the viscosity enhancer in the high-viscosity modified asphalt, and the rest is the same as Example 1, specifically: the viscosity enhancer is a TPS additive, and the dosage is 10 parts. It can be seen from Example 1 and Example 2 that changing the type and dosage of the viscosity enhancer does not change the road performance of the high-viscosity modified emulsified asphalt. The performance test results of the high-viscosity modified emulsified asphalt obtained in Example 2 are shown in Table 1.

[0033] Example 3 This example is different from Example 1 only in the type and amount of the tackifier in the high-viscosity modified asphalt, and the rest is the same as Example 1, specifically: the tackifier is terpene resin, and the amount is 8 parts. It can be seen from Example 1 and Example 3 that changing the type and amount of the tackifier does not change the road performance of the high-viscosity modified emulsified asphalt. The performance test results of the high-viscosity modified emulsified asphalt obtained in Example 3 are shown in Table 1.

[0034] Example 4 This example is different from Example 1 only in the amount of the modifier in the high-viscosity modified asphalt, and the rest is the same as Example 1, specifically: the amount of the SBS modifier is 6 parts. It can be seen from Example 1 and Example 4 that changing the amount of the SBS modifier slightly reduces the 60°C dynamic viscosity, but it is generally the same as Example 1, and does not change the road performance of the high-viscosity modified emulsified asphalt. The performance test results of the high-viscosity modified emulsified asphalt obtained in Example 4 are shown in Table 1.

[0035] Example 5 This example is different from Example 1 only in the amount of the tackifier in the high-viscosity modified asphalt, and the rest is the same as Example 1, specifically: the amount of the tackifier C9 resin is 4 parts. It can be seen from Example 1 and Example 5 that changing the amount of the tackifier C9 resin does not change the road performance of the high-viscosity modified emulsified asphalt. The performance test results of the high-viscosity modified emulsified asphalt obtained in Example 5 are shown in Table 1.

[0036] Example 6 This example is different from Example 1 only in the emulsifier dosage in the high-viscosity modified emulsified asphalt, and the rest is the same as Example 1, specifically: the dosage of the slow-cracking and fast-setting cationic emulsifier is 2 parts. It can be seen from Example 1 and Example 6 that changing the dosage of the slow-cracking and fast-setting cationic emulsifier does not change the road performance of the high-viscosity modified emulsified asphalt. The performance test results of the high-viscosity modified emulsified asphalt obtained in Example 6 are shown in Table 1.

[0037] Example 7 This example is different from Example 1 only in the type of the hydrophobic agent in the high-viscosity modified emulsified asphalt, and the rest is the same as Example 1, specifically: the hydrophobic agent is octyltriethoxysilane. It can be seen from Example 1 and Example 7 that changing the type of the hydrophobic agent does not change the road performance of the high-viscosity modified emulsified asphalt. The performance test results of the high-viscosity modified emulsified asphalt obtained in Example 7 are shown in Table 1.

[0038] Example 8 This example is different from Example 1 only in the amount of the hydrophobic agent in the high-viscosity modified emulsified asphalt, and the rest is the same as Example 1, specifically: the amount of the polydimethylsiloxane is 0.1 parts. It can be seen from Example 1 and Example 8 that changing the amount of the polydimethylsiloxane does not change the road performance of the high-viscosity modified emulsified asphalt. The performance test results of the high-viscosity modified emulsified asphalt obtained in Example 8 are shown in Table 1.

[0039] Example 9 This example is different from Example 1 only in the amount of the hydrophobic agent in the high-viscosity modified emulsified asphalt, and the rest is the same as Example 1, specifically: the amount of the hydrophobic agent polydimethylsiloxane is 0.3 parts. It can be seen from Example 1 and Example 8 that changing the amount of the hydrophobic agent polydimethylsiloxane does not change the road performance of the high-viscosity modified emulsified asphalt. The performance test results of the high-viscosity modified emulsified asphalt obtained in Example 9 are shown in Table 1.

[0040] Comparative Example 1 The difference between this comparative example and Example 1 is that no hydrophobic agent is added, and the rest is the same as Example 1. The performance test results of the high-viscosity modified emulsified asphalt obtained in Comparative Example 1 are shown in Table 1.

[0041] Comparative Example 2 The difference between this comparative example and Example 1 is that the high-viscosity modified emulsified asphalt is replaced by styrene-butadiene rubber (SBR) modified emulsified asphalt, and the rest is the same as Example 1, specifically: The SBR modified emulsified asphalt comprises, by mass: 100 parts of the slow-cracking and fast-setting cationic emulsified asphalt and 4.5 parts of the SBR modifier.

[0042] The slow-cracking, fast-setting cationic emulsified asphalt comprises, by mass: 60 parts of the 90# base asphalt, 2.5 parts of the slow-cracking, fast-setting cationic emulsifier, 1.5 parts of polyvinyl alcohol, 0.2 parts of the hydrophobic agent polydimethylsiloxane, hydrochloric acid is used to adjust the pH value of the soap solution to 2-3, and the rest is made up with water.

[0043] The SBR modified emulsified asphalt is prepared by the following method: The 90# matrix asphalt is heated at 150°C to a molten state for later use; Heat water to 70°C, take 0.8 times ml of 70°C hot water, slowly add the emulsifier into the water, and stir continuously until the emulsifier and water are integrated, use hydrochloric acid to adjust the pH value of the solution to 2-3, add the hydrophobic agent and continue to add 70°C water to the mixed solution until the mass of the mixed solution outside the emulsifier reaches m1, to obtain the soap solution; Add the soap solution into the cleaned colloid mill, turn on the colloid mill, and then slowly pour the molten 90# base asphalt into the colloid mill at a relatively slow speed. Grind and disperse it in the colloid mill. After the SBR modified emulsified asphalt is cooled to room temperature, add the SBR modifier, and use an electric stirrer to stir at a speed of 120r / min for 3 minutes to obtain the SBR modified emulsified asphalt.

[0044] The performance test results of the high-viscosity modified emulsified asphalt obtained in Comparative Example 2 are shown in Table 1.

[0045] Table 1 Performance test results of high viscosity modified emulsified asphalt described in Examples and Comparative Examples Example / Comparative Example Needle penetration (0.1mm) Softening point (℃) 5℃ elongation (cm) 60℃ dynamic viscosity (Pa·s) Contact angle (°) Example 1 48 92.4 41 164863 111.69 Example 2 48 91.3 44 159872 111.67 Example 3 49 92.8 43 143981 110.93 Example 4 52 84.8 38 120563 109.79 Example 5 49 85.3 37 113261 109.73 Example 6 42 88.1 39 112677 111.86 Example 7 47 92.6 42 174531 108.55 Example 8 48 92.5 41 165839 102.25 Example 9 47 92.8 40 173091 112.12 Comparative Example 1 48 92.5 41 168147 85.35 Comparative Example 2 59 78.3 38 4584 102.18 Through Examples 1-9 and Comparative Example 1, it can be found that the needle penetration of the high-viscosity modified emulsified asphalt in the above Examples and Comparative Example is in the range of 42~52 (0.1mm), the softening point is greater than 84°C, the elongation at 5°C is ≥37cm, and the dynamic viscosity at 60°C is greater than 100000Pa·s, but the contact angles of Examples 1-9 are significantly higher than that of Comparative Example 1, which shows that the addition of the hydrophobic agent does not change the road performance of the high-viscosity modified emulsified asphalt, but will change the surface free energy of the high-viscosity modified asphalt, reduce the adsorption of water by the high-viscosity modified asphalt, and reduce the possibility of water entering the high-viscosity modified emulsified asphalt slurry mixture.

[0046] Through Example 1 and Comparative Example 2, it can be found that compared with Example 1, the needle penetration of Comparative Example 1 is increased by 11 (0.1mm), the softening point is reduced by 14.1°C, the elongation at 5°C is reduced by 3cm, the dynamic viscosity at 60°C decreases the most, which is only 1 / 36 of that in Example 1, and the contact angle is reduced by 9.51°. This shows that the high-viscosity modified emulsified asphalt is better in plasticity, heat resistance and resistance to high-temperature permanent deformation, stronger bonding ability, and better hydrophobic performance under the same dosage of hydrophobic agent than the ordinary SBR modified emulsified asphalt.

[0047] It can be seen from the above embodiments and comparative examples that the preparation method of high-viscosity modified emulsified asphalt for steel slag slurry mixture provided by the present application can, on the one hand, reduce the influence of poor volume stability of steel slag on the performance of slurry mixture, and on the other hand, further improve the performance of emulsified asphalt for slurry mixture, thereby improving the performance and service life of slurry mixture, improving road traffic safety and full life cycle economic benefits. It can be further seen that the beneficial effects of the present application are: 1. The high-viscosity modified emulsified asphalt provided in the present application is prepared by first modifying and then emulsifying, and has a softening point ≥80°C, an elongation ≥30cm at 5°C, and a dynamic viscosity ≥100,000Pa·s at 60°C. As a binder, it can not only bond aggregates together, but also make the slurry mixture layer and the underlying layer more closely bonded, effectively reducing the possibility of loosening, peeling and other defects in the slurry mixture thin layer.

[0048] 2. The high-viscosity modified emulsified asphalt proposed in this application has excellent hydrophobicity after demulsification. When used in slurry mixture, it can not only effectively isolate water from invading the interior of the aggregate, but also reduce water erosion on the asphalt-aggregate interface, greatly avoiding the occurrence of road surface diseases caused by volume expansion and crushing of aggregates such as steel slag that are easily affected by moisture.

[0049] 3. The hydrophobic agent used in this application is one of polydimethylsiloxane or octyltriethoxysilane, and the dosage is between 0.1 and 0.3 (mass ratio) of the high-viscosity modified emulsified asphalt. The two hydrophobic agents have good compatibility with asphalt, reducing the impact of the addition of admixtures on the storage stability of high-viscosity modified emulsified asphalt.

[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for preparing high-viscosity modified emulsified asphalt for steel slag slurry mixture, characterized in that: include: The steps include high viscosity modified asphalt melting step, soap solution preparation step and grinding step, wherein: The high-viscosity modified emulsified asphalt includes, by mass: 60 parts of high-viscosity modified asphalt, 2 to 3 parts of slow-cracking and fast-setting cationic emulsifier, 1.5 parts of stabilizer, 0.1 to 0.3 parts of hydrophobic agent, 0.3 to 0.8 parts of pH adjuster, and 34.7 to 36.0 parts of water.

2. The method for preparing high-viscosity modified emulsified asphalt for steel slag slurry mixture according to claim 1, characterized in that: The high-viscosity modified asphalt melting step comprises: heating the high-viscosity modified asphalt to a molten state at 175° C.; The soap solution preparation step comprises: determining the mass of the mixed solution except the emulsifier in the mixed solution as m1 according to the emulsifier dosage, and obtaining the soap solution; The grinding step includes: adding the soap solution into a colloid mill, and slowly adding the high-viscosity modified asphalt in a molten state into the colloid mill, and forming the high-viscosity modified emulsified asphalt after grinding and dispersion in the colloid mill.

3. The method for preparing high-viscosity modified emulsified asphalt for steel slag slurry mixture according to claim 1, characterized in that: The stabilizer is polyvinyl alcohol, the hydrophobic agent is one of polydimethylsiloxane and octyltriethoxysilane, and the pH regulator is hydrochloric acid.

4. The method for preparing high-viscosity modified emulsified asphalt for steel slag slurry mixture according to claim 2, characterized in that: Before determining the mass of the mixed liquid excluding the emulsifier in the mixed liquid as m1 according to the emulsifier dosage, the method further includes: Take 70℃ hot water with a mass of 0.8 times m1; Slowly add the emulsifier into the water while stirring continuously; After the emulsifier and water are stirred together, hydrochloric acid is added to adjust the pH value of the mixture to 2-3; A hydrophobic agent was added to the mixed solution, and hot water at 70° C. was continued to be added.

5. The method for preparing high-viscosity modified emulsified asphalt for steel slag slurry mixture according to claim 1, characterized in that: The high-viscosity modified asphalt comprises, by mass, 100 parts of base asphalt, 6 to 10 parts of modifier, 0.1 part of sulfur, 1 to 3 parts of furfural extracted oil, and 4 to 15 parts of viscosity enhancer.

6. The method for preparing high-viscosity modified emulsified asphalt for steel slag slurry mixture according to claim 5, characterized in that: The modifier is YH-791H linear SBS, and the tackifier is one of C9 resin, TPS additive, and terpene resin.

7. The method for preparing high-viscosity modified emulsified asphalt for steel slag slurry mixture according to claim 5, characterized in that: The base asphalt is 90# base asphalt.

8. The method for preparing high-viscosity modified emulsified asphalt for steel slag slurry mixture according to claim 5, characterized in that: The preparation method of the high-viscosity modified asphalt is: The base asphalt is heated at 175° C. to a molten state, and the furfural extracted oil and the modifier are added simultaneously; After swelling for 20 min at 175 °C, high-speed shearing was performed at 4000 r / min for 40 min. Then, the sulfur is added and stirred at 175° C. at a speed of 120 r / min for 2 hours to obtain the high-viscosity modified asphalt.

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