An asphalt-based concentrated suspension and method of making same and sand-containing fog seal material

Abstract

The present application provides a bitumen-based concentrated suspension, a preparation method thereof and a sand-containing fog seal material, the bitumen-based concentrated suspension comprising bitumen, emulsifier, china clay, water, tackifier, thickener, stabilizer and rheological aid, and the sand-containing fog seal material comprising 100 parts of the bitumen-based concentrated suspension, 10-30 parts of water and 15-30 parts of fine sand. The sand-containing fog seal material provided by the present application has strong sand suspending capacity, good material uniformity, good construction convenience, and a matt state after surface drying, and can not only greatly improve the appearance quality of the original road surface, solve the early diseases such as water seepage, pitted surface and slight particle shedding of the original road surface, but also will not have negative impact on the anti-skid performance of the road surface.

Description

Technical Field

[0001] This invention relates to the field of road maintenance technology, specifically to an asphalt-based concentrated suspension, its preparation method, and a sand-containing fog seal material. Background Technology

[0002] With the continuous increase in the mileage of highways in my country, highway maintenance has gradually become the focus of highway management departments. Highway departments undertake the basic task of providing social services, and in terms of financial input and output, they must not only consider the cost-effectiveness ratio of their own departments but also comprehensively consider social costs and benefits. Therefore, preventative maintenance better reflects the nature of highway maintenance work and achieves its objectives. This is of great significance for extending the service life of highways, reducing highway life-cycle costs, improving highway service levels, and increasing resource utilization efficiency. Whether it's cement or asphalt pavement, after a period of use, various damages, deformations, and other defects will gradually appear; these are collectively referred to as pavement defects. Common early defects include: cracks, potholes, ruts, loosening, subsidence, bridge approach and culvert slab slab slab slabs, and surface damage.

[0003] Sand-containing fog seal is a mixture of fog seal material, mainly composed of emulsified asphalt or coal tar pitch, clay, polymer additives, etc., and sand. It is a preventive maintenance material for asphalt pavements. It is sprayed on the asphalt pavement using a special high-pressure spray truck to form a thin repair and protective layer. It can seal micro-cracks in the pavement, prevent loose aggregate from falling off, and prevent water infiltration. It can also delay the aging of asphalt pavement, reduce the temperature of the asphalt surface layer, improve the anti-skid performance of the pavement, and quickly blacken the pavement. It can significantly improve the appearance of the pavement, improve driving safety, extend the service life of the pavement, and reduce the construction and maintenance costs of asphalt pavement.

[0004] Sand-containing fog seal technology is developed based on fog seal technology. It involves mixing fine sand particles with modified emulsified asphalt, adding special modifiers to ensure the sand is uniformly suspended in the asphalt, and then spraying it onto the road surface using high-pressure equipment. Because conventional modified emulsified asphalt has a relatively low viscosity, typically between 1.6 cP and 302 cP, it is difficult to achieve a sand-suspending effect when mixed with fine sand. Special additives must be added to increase the viscosity to the range of 550 cP to 800 cP to achieve a stable and uniform sand-suspending effect. However, these sand-stabilizing additives are expensive, thus increasing the construction cost of sand-containing fog seal materials.

[0005] Patent ZL201810345168.4 discloses an asphalt-based concentrated sealing material, its preparation method, and a sand-containing fog seal mixture. The provided asphalt-based concentrated sealing material utilizes clay, emulsifier, and water to form a mud-type emulsified soap solution, emulsifying the asphalt and allowing the components to combine to form a unified whole, thus improving the consistency and stability of the emulsified asphalt. The viscosity of the asphalt-based concentrated sealing material is 1400–2300 centipoise. However, this material has a high viscosity, making it unsuitable for application, and after dilution with water, the viscosity decreases rapidly, failing to suspend fine sand.

[0006] Patent CN201810469938.6 discloses an asphalt pavement rough surface repair material, its preparation method, and an asphalt pavement rough surface repair suspension aggregate. The asphalt pavement rough surface repair material is prepared from raw materials comprising the following components: asphalt, emulsifier, clay, acrylic resin, and water. The asphalt pavement rough surface repair material provided by this invention utilizes clay, emulsifier, and water to form a mud-type emulsified soap solution to emulsify the asphalt, allowing the components to combine and form a unified whole, increasing the viscosity of the emulsified asphalt. It can replace asphalt pavement surface oil mixed with fine aggregate, and can lock in loose aggregate even at lower thicknesses, without affecting pavement elevation and preventing damage to the original pavement caused by oxidation, climate, and traffic, thus protecting and extending the service life of the pavement. However, this material has a high viscosity, making it unsuitable for application. After dilution with water, the viscosity decreases rapidly, making it unable to suspend fine sand.

[0007] Patent CN202010756782.7 discloses a high-performance sand-containing fog seal material and its preparation method. The material composition includes amphoteric emulsified asphalt, a suspending thickener, a thickening and toughening agent, a film-forming agent, a suspending agent, a corrosion inhibitor, and anti-skid fine sand. The high-temperature pull-out strength of this invention is at least 20% higher than that of existing traditional sand-containing fog seal materials, which can solve the problems of poor high-temperature adhesion and poor wear resistance of existing materials, and has advantages such as short drying time, good curing effect, and long service life. However, the sand-containing fog seal material obtained by this application has obvious reflection after surface drying, which is not conducive to driving safety. Summary of the Invention

[0008] To partially solve the aforementioned technical problems, this invention provides an asphalt-based concentrated suspension, its preparation method, and a sand-containing fog seal material. By adding a thickener and clay, the Brinell viscosity of the asphalt-based concentrated suspension at 25°C can be significantly increased. The thickener molecular chains bind the asphalt particles together through physical and chemical interactions, forming a network, thereby increasing the Brinell viscosity of the emulsified asphalt at 25°C. Clay, by dispersing in the emulsified asphalt system, forms a colloid, increasing the system's density and thus improving the Brinell viscosity of the emulsified asphalt. Furthermore, by increasing the yield stress of the material, the particle size of the sand can be increased, resulting in a more pronounced matte finish after surface drying.

[0009] A bitumen-based concentrated suspension comprises bitumen, an emulsifier, and water, wherein the mass amount of the emulsifier is 4%-8% of the mass amount of the bitumen, and the mass amount of water is 0.9-1.5 times the mass amount of the bitumen. It also comprises clay and a thickener, wherein the mass amount of the clay is 30%-50% of the mass amount of the bitumen, and the particle size of the clay is 325-800 mesh, and the clay is any one of montmorillonite, bentonite, illite, kaolin, and diatomaceous earth; the mass amount of the thickener is 0.1%-1% of the mass amount of the bitumen, and the thickener is any one of cationic xanthan gum, cationic polyacrylamide, cationic guar gum, and modified starch ether.

[0010] The aforementioned asphalt-based concentrated suspension also includes a thickener, a stabilizer, and a rheology modifier. The amount of the thickener is 15%-30% of the mass of the asphalt, the amount of the stabilizer is 1%-10% of the mass of the asphalt, and the amount of the rheology modifier is 0.1%-1% of the mass of the asphalt.

[0011] The asphalt mentioned above is 70# base asphalt.

[0012] The emulsifier mentioned above is a slow-cracking, fast-setting amide-based cationic asphalt emulsifier.

[0013] The aforementioned tackifier is any one of cationic styrene-butadiene latex, nonionic acrylic resin, or nonionic chloroprene latex.

[0014] The stabilizer mentioned above is any one of butyl rubber, nitrile rubber, and cis-butadiene rubber.

[0015] The rheology modifier mentioned above is Subote's AM-2000.

[0016] The preparation method of asphalt-based concentrated suspension includes the following steps: (1) Emulsifier, thickener, thickener, rheology modifier, stabilizer and water are mixed and stirred in a water bath at 80~85℃ to fully dissolve each component and obtain soap solution; (2) The soap solution obtained in step (1) is mixed with hot asphalt at 140°C and sheared and emulsified by a colloid mill to obtain modified emulsified asphalt. (3) Add clay to the modified emulsified asphalt obtained in step (2) to obtain asphalt-based concentrated suspension.

[0017] The stirring time in step (1) above is 4 hours and the stirring speed is 300 r / min.

[0018] The stirring time in step (3) above is 3 min to 6 min, and the rotation speed is 3000 r / min.

[0019] A sand-containing fog seal material, by mass parts, comprises 100 parts asphalt-based concentrated suspension, 10-30 parts water, and 15-30 parts fine sand.

[0020] The fine sand mentioned above is 30-80 mesh corundum.

[0021] The present invention has the following advantages over the prior art: 1. In the preparation process of the asphalt-based concentrated suspension of this application, the thickener molecular chain and the asphalt particles are linked together through physical and chemical interactions to form a network, thereby increasing the Brinell viscosity of the emulsified asphalt at 25°C. Clay can be dispersed in the emulsified asphalt system to form a colloid, increasing the density of the system. Furthermore, the thickener improves the stability of the clay in the asphalt, thus achieving the purpose of increasing the Brinell viscosity of the emulsified asphalt. Simultaneously, the thixotropic properties of the clay material are utilized; under shear force, the material thins, facilitating construction, while in a static state, the material becomes more viscous, preventing the sedimentation of fine sand. The asphalt-based concentrated suspension of this application has a Brinell viscosity greater than 1400 cP, exhibiting excellent sand-suspending performance.

[0022] 2. The rheological properties of the sand-containing fog seal material conform to the Herbert-Barton fluid model. The greater the yield stress of the material, the larger the unsettled particle size of the sand, and the smaller the negative impact on the anti-skid performance of the road surface. The purpose of adding thickeners, clay, and rheology modifiers in this application is to increase the yield stress of the material, thereby increasing the sand particle size, ensuring the anti-skid performance of the road surface after the material is surface-dried, and improving driving safety.

[0023] 3. Due to the presence of thickeners and rheology modifiers, the sand-containing mist sealing material of the present invention has significantly improved fluidity after being diluted with 10% water compared with existing patented technologies, but still has a good sand-suspending effect. It is convenient to construct, has no special requirements for spraying equipment, and the material is uniform and stable.

[0024] 4. The sand-containing fog seal material provided by this invention has strong sand suspension capacity, good material uniformity, good construction convenience, and a matte finish after surface drying. It can not only greatly improve the appearance quality of the original road surface and solve early defects such as water seepage, pitting, and slight particle loss, but also will not have a negative impact on the anti-skid performance of the road surface. Attached Figure Description

[0025] Figure 1 shows the appearance quality of the sand-containing fog seal materials in Example 1 and Comparative Example 2. Detailed Implementation

[0026] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0027] Example 1: Preparation of Asphalt-Based Concentrated Suspension

[0028] (1) Mix 5 parts of emulsifier, 20 parts of cationic styrene-butadiene latex, 0.4 parts of cationic guar gum, 2 parts of butyl rubber, 0.3 parts of rheology modifier, and 110 parts of water in a water bath at 80°C for 4 hours at a stirring speed of 300 r / min to fully dissolve each component and obtain soap solution. (2) Mix the soap solution obtained in step (1) with 100 parts of hot asphalt at 140°C, and shear emulsify it through a colloid mill to obtain modified emulsified asphalt. (3) Add 35 parts of 325 mesh bentonite to the modified emulsified asphalt prepared in step (2), mix and stir at room temperature for 5 minutes at a stirring speed of 3000 r / min to obtain asphalt-based concentrated suspension.

[0029] Example 2 Preparation of Asphalt-Based Concentrated Suspension (1) Mix 5 parts emulsifier, 20 parts nonionic acrylic resin, 0.4 parts cationic xanthan gum, 2 parts nitrile rubber, 0.3 parts rheology modifier, and 110 parts water in a water bath at 80°C for 4 hours at a speed of 300 r / min to ensure that all components are fully dissolved and obtain soap solution; (2) The soap solution obtained in step (1) is mixed with 100 parts of 140℃ asphalt and then passed through an emulsified asphalt colloid mill to obtain modified emulsified asphalt. (3) Add 45 parts of 325 mesh kaolin to the modified emulsified asphalt prepared in step (2), mix and stir at room temperature for 3 min to 6 min at a speed of 3000 r / min to obtain asphalt-based concentrated suspension.

[0030] Example 3: Preparation of Asphalt-Based Concentrated Suspension (1) Mix 5 parts of emulsifier, 20 parts of nonionic chloroprene latex, 0.4 parts of cationic polyacrylamide, 2 parts of nitrile rubber, 0.3 parts of rheology modifier, and 110 parts of water in a water bath at 80°C for 4 hours at a speed of 300 r / min to fully dissolve each component and obtain soap solution; (2) The soap solution obtained in step (1) is mixed with 100 parts of 140℃ asphalt and then passed through an emulsified asphalt colloid mill to obtain modified emulsified asphalt. (3) Add 40 parts of 325 mesh montmorillonite to the modified emulsified asphalt prepared in step (2), and mix and stir in a water bath at 80~85℃ for 3min~6min at a speed of 3000r / min to obtain asphalt-based concentrated suspension.

[0031] Example 4: Preparation of Asphalt-Based Concentrated Suspension (1) Mix 5 parts of emulsifier, 20 parts of nonionic chloroprene latex, 0.1 parts of modified starch ether, 2 parts of cis-butadiene rubber, 0.3 parts of rheology modifier, and 110 parts of water in a water bath at 80°C for 4 hours at a stirring rate of 300 r / min to fully dissolve each component and obtain soap solution. (2) The soap solution obtained in step (1) is mixed with 100 parts of 140℃ asphalt and then passed through an emulsified asphalt colloid mill to obtain modified emulsified asphalt. (3) Add 10 parts of 325 mesh bentonite and 20 parts of 325 mesh diatomite to the modified emulsified asphalt prepared in step (2), mix and stir at room temperature for 3 min to 6 min at a speed of 3000 r / min to obtain asphalt-based concentrated suspension.

[0032] Example 5 Preparation of Asphalt-Based Concentrated Suspension (1) Mix 5 parts of emulsifier, 20 parts of nonionic chloroprene latex, 1 part of modified starch ether, 2 parts of cis-butadiene rubber, 0.3 parts of rheology modifier, and 110 parts of water in a water bath at 80°C for 4 hours at a stirring rate of 300 r / min to fully dissolve each component and obtain soap solution. (2) The soap solution obtained in step (1) is mixed with 100 parts of 140℃ asphalt and then passed through an emulsified asphalt colloid mill to obtain modified emulsified asphalt. (3) Add 10 parts of 325 mesh bentonite and 20 parts of 325 mesh diatomite to the modified emulsified asphalt prepared in step (2), mix and stir at room temperature for 3 min to 6 min at a speed of 3000 r / min to obtain asphalt-based concentrated suspension.

[0033] Example 6: Preparation of Asphalt-Based Concentrated Suspension (1) Mix 5 parts of emulsifier, 20 parts of nonionic chloroprene latex, 0.4 parts of modified starch ether, 2 parts of cis-butadiene rubber, 0.3 parts of rheology modifier, and 110 parts of water in a water bath at 80°C for 4 hours at a stirring rate of 300 r / min to fully dissolve each component and obtain soap solution. (2) The soap solution obtained in step (1) is mixed with 100 parts of 140℃ asphalt and then passed through an emulsified asphalt colloid mill to obtain modified emulsified asphalt. (3) Add 10 parts of 325 mesh bentonite and 20 parts of 325 mesh diatomite to the modified emulsified asphalt prepared in step (2), mix and stir at room temperature for 3 min to 6 min at a speed of 3000 r / min to obtain asphalt-based concentrated suspension.

[0034] Comparative Example 1: Preparation of Asphalt-Based Concentrated Suspension (1) Mix 5 parts of emulsifier, 20 parts of nonionic chloroprene latex, 2 parts of nitrile rubber, 0.3 parts of rheology modifier and 110 parts of water in a water bath at 80°C for 4 hours at a stirring rate of 300 r / min to fully dissolve each component and obtain soap solution. (2) The soap solution obtained in step (1) is mixed with 100 parts of 140℃ asphalt and then passed through an emulsified asphalt colloid mill to obtain modified emulsified asphalt. (3) Add 40 parts of 325 mesh montmorillonite to the modified emulsified asphalt prepared in step (2), mix and stir at room temperature for 3 min to 6 min at a speed of 3000 r / min to obtain asphalt-based concentrated suspension.

[0035] Comparative Example 2: Preparation of Asphalt-Based Concentrated Suspension (1) Mix 5 parts of emulsifier, 20 parts of nonionic chloroprene latex, 0.4 parts of cationic polyacrylamide, 2 parts of nitrile rubber, 0.3 parts of rheology modifier, and 110 parts of water in a water bath at 80°C for 4 hours at a stirring rate of 300 r / min to fully dissolve each component and obtain soap solution. (2) The soap solution obtained in step (1) is mixed with 100 parts of 140℃ asphalt and then passed through an emulsified asphalt colloid mill to obtain modified emulsified asphalt. (3) The amount of clay material added is 0. The modified emulsified asphalt obtained in step (2) is mixed and stirred at room temperature for 3 min to 6 min with a rotation speed of 3000 r / min to obtain asphalt-based concentrated suspension.

[0036] Comparative Example 3 (1) Mix 5 parts of emulsifier, 20 parts of nonionic chloroprene latex, 2 parts of nitrile rubber, 0.3 parts of rheology modifier and 110 parts of water in a water bath at 80°C for 4 hours at a stirring rate of 300 r / min to fully dissolve each component and obtain soap solution. (2) The soap solution obtained in step (1) is mixed with 100 parts of 140℃ asphalt and then passed through an emulsified asphalt colloid mill to obtain modified emulsified asphalt. (3) The amount of clay material added is 0. The modified emulsified asphalt obtained in step (2) is mixed and stirred at room temperature for 3 min to 6 min with a rotation speed of 3000 r / min to obtain asphalt-based concentrated suspension.

[0037] Comparative Example 4 The material prepared according to Example 1 of patent CN201810469938.6.

[0038] Comparative Example 5 The material prepared according to Example 1 of patent CN202010756782.7.

[0039] Test Example 1: Brinell Viscosity Measurement The Brinell viscosities of the asphalt-based concentrated suspensions in Examples 1-5 were tested using a Brinell viscometer, and the results are shown in Table 1. Table 1

[0040] Note: Comparative Example 4 and Comparative Example 5 are the materials prepared in Example 1 of the two patents mentioned above.

[0041] As shown in Table 1, the sand-containing fog seal materials in Examples 1-3 and 5-6 have a Brinell viscosity of more than 1400 cP at 25°C, which is much greater than the Brinell viscosity of the materials prepared in the existing patent examples. This indicates that the asphalt-based concentrated suspension in the examples has a good sand-suspending capacity.

[0042] The results from Examples 4-6 show that when the thickener is used at its upper limit, the consistency of the modified emulsified asphalt is greater than 3000 cP. Sufficient water needs to be added for dilution during use to facilitate the application of the material. When the thickener is used at its lower limit, i.e., in Example 5, the consistency of the modified emulsified asphalt is comparable to that of commercially available products, and the workability is good, but the sand-suspending effect is average.

[0043] Test Example 2: Performance Determination of Sand-Containing Fog Seal Materials The asphalt-based concentrated suspensions obtained in Examples 1-6 and Comparative Examples 1-5 were mixed for 2 minutes according to the following mass ratios: 100 parts asphalt-based concentrated suspension, 20 parts 30-80 mesh corundum, and 20 parts water, to obtain a sand-containing fog seal material.

[0044] The performance of sand-containing fog sealant was evaluated by permeability coefficient, friction pendulum value, surface drying time, and bond strength. The permeability coefficient was tested using a pavement permeability meter, following the test method JTG E20-2011 "Test Procedures for Asphalt and Asphalt Mixtures in Kilometer Engineering" T0730-2011. The friction pendulum value was measured using a pendulum friction coefficient tester. The surface drying time was determined according to "Test Methods for Building Sealing Materials Part 5: Determination of Surface Drying Time GB / T 13477.5-2002". For bond strength testing, a 15cm×15cm×15cm cement concrete specimen was used as the bonding object. A layer of sand-containing fog sealant was evenly applied at a dosage of 1kg / m² and placed in a 60℃ oven for 12 hours. After cooling, a 4cm×4cm mortar pull-out block was bonded to the sand-containing fog sealant using epoxy putty. The specimen was left to stand at room temperature for 24 hours, and then the pull-out strength was tested using a pull-out tester. The results are shown in Table 2. As shown: Table 2

[0045] As shown in Table 2, after using the asphalt-based concentrated suspension obtained in Examples 1-6 to prepare sand-containing fog seal materials, the friction pendulum value of the road surface not only did not decrease, but also increased slightly. This indicates that the sand-containing fog seal materials obtained using the asphalt-based concentrated suspension in Examples 1-6 have no negative impact on the anti-skid performance of the road surface. Because Comparative Example 1 lacked a thickener, the emulsified asphalt had a low consistency, preventing the clay from being stably suspended in it. This resulted in a low yield stress in the prepared sand-containing fog seal material, making it difficult to suspend the clay and reducing the skid resistance of the original road surface. Furthermore, the inability of the clay to suspend the clay resulted in a matte finish after surface drying. In Comparative Example 2, the absence of clay resulted in a low yield stress in the prepared sand-containing fog seal material, making it difficult to suspend the clay and reducing the skid resistance of the original road surface. The absence of clay also resulted in a matte finish after surface drying. In Comparative Example 3, the absence of both a thickener and clay resulted in a low yield stress in the prepared sand-containing fog seal material, making it difficult to suspend the clay and reducing the skid resistance of the original road surface. Furthermore, it exhibited a matte finish after surface drying.

[0046] Furthermore, the sand-containing fog seal materials in Comparative Examples 1-5 slightly reduced the anti-skid performance of the road surface. The permeability coefficient of the road surface all became 0, indicating that the sand-containing fog seal materials have a good sealing effect on micro-cracks in the road surface, solving the problem of water seepage. The surface drying time of the above-mentioned sand-containing fog seal materials was less than 3 hours, indicating that there is no need for prolonged traffic closure. The bond strength results show that the bond strength of the sand-containing fog seal materials in the examples is greater than 1 MPa, while the commercially available sand-containing fog seal materials are only 0.6 MPa. This indicates that the sand-containing fog seal materials in the examples have better adhesion and durability to the original road surface. In terms of appearance quality, the sand-containing fog seal materials in the examples all exhibit a matte finish after surface drying, which will not compromise driving safety, while the comparative examples and commercially available materials exhibit a smooth finish after surface drying. Furthermore, the experimental results of the comparative examples show that thickeners and clay are key to improving the sand-suspension performance and appearance quality of the sand-containing fog seal materials.

[0047] Conclusion: This invention uses cheaper clay materials to replace expensive suspending agents, and the prepared material utilizes the thixotropic properties of clay. Under shear force, the material thins out, facilitating construction; in a static state, the material becomes more viscous, preventing the settling of fine sand. The sand-containing mist seal material provided by this invention has strong sand suspension capacity, good material uniformity, good construction convenience, and a matte finish after surface drying. It not only significantly improves the appearance quality of the original pavement and solves early defects such as water seepage, pitting, and minor particle shedding, but also does not negatively affect the anti-skid performance of the pavement.

[0048] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An asphalt-based concentrated suspension, comprising asphalt, an emulsifier, and water, wherein the mass amount of the emulsifier is 4%-8% of the mass amount of the asphalt; and the mass amount of water is 0.9-1.5 times the mass amount of the asphalt, characterized in that: It also includes clay and thickener, wherein the mass of clay used is 30%-50% of the mass of asphalt used, the particle size of clay is 325-800 mesh, and the clay is any one of montmorillonite, bentonite, illite, kaolin, and diatomaceous earth. The thickener is used at a mass ratio of 0.1%-1% of the asphalt mass, and the thickener is any one of cationic xanthan gum, cationic polyacrylamide, cationic guar gum, and modified starch ether. The asphalt-based concentrated suspension further includes a thickener, a stabilizer, and a rheology modifier. The thickener is used at a mass ratio of 15%-30% of the asphalt mass, the stabilizer is used at a mass ratio of 1%-10% of the asphalt mass, and the rheology modifier is used at a mass ratio of 0.1%-1% of the asphalt mass. The emulsifier is a slow-cracking, fast-setting amide-based cationic asphalt emulsifier.

2. The asphalt-based concentrated suspension according to claim 1, characterized in that: The tackifier is any one of cationic styrene-butadiene latex, nonionic acrylic resin, or nonionic chloroprene latex.

3. The asphalt-based concentrated suspension according to claim 1, characterized in that: The stabilizer is any one of butyl rubber, nitrile rubber, and cis-butadiene rubber.

4. The method for preparing the asphalt-based concentrated suspension according to claim 1, characterized in that, Includes the following steps: (1) Mix and stir the emulsifier, thickener, thickener, rheology modifier, stabilizer and water in a water bath at 80-85°C to fully dissolve each component and obtain soap solution; (2) The soap solution obtained in step (1) is mixed with hot asphalt at 140°C and shear emulsified by a colloid mill to obtain modified emulsified asphalt. (3) Add clay to the modified emulsified asphalt obtained in step (2) to obtain asphalt-based concentrated suspension.

5. The method for preparing the asphalt-based concentrated suspension according to claim 4, characterized in that: The stirring time in step (1) is 4 hours and the stirring speed is 300 r / min.

6. A sand-containing fog sealing material, characterized in that: The product comprises, by mass, 100 parts asphalt-based concentrated suspension, 10-30 parts water, and 15-30 parts fine sand, wherein the asphalt-based concentrated suspension is the asphalt-based concentrated suspension according to claim 1 or the asphalt-based concentrated suspension prepared according to the preparation method of claim 4.

7. A sand-containing fog seal layer according to claim 6, characterized in that: The fine sand is 30-80 mesh corundum.

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