Composite modified emulsified asphalt, preparation method and application thereof

Abstract

The application belongs to the technical field of pavement engineering materials, and particularly relates to a composite modified emulsified asphalt as well as a preparation method and application thereof. The application provides a preparation method of the composite modified emulsified asphalt, which comprises the following steps: (1) preparing a composite modified asphalt: first heating base asphalt, adding an elasticizer to develop temperature, then adding a viscosity regulator and a dispersant, first shearing, and then adding a tackifier, a plasticizer, a coupling agent and a stabilizer, second shearing; (2) preparing a soap solution; and (3) mixing the composite modified asphalt after temperature reduction and the soap solution, and colloid grinding. The composite modified emulsified asphalt prepared by the application has higher bonding strength, softening point and dynamic viscosity, lower penetration, better high-temperature performance, higher 5 DEG C ductility, better low-temperature performance, and excellent anti-cracking and peeling performance and durability.

Description

Technical Field

[0001] This invention belongs to the field of road engineering materials technology, specifically relating to a composite modified emulsified asphalt, its preparation method, and its application. Background Technology

[0002] Modified emulsified asphalt is a widely used, technologically mature, and stable road engineering material, widely applied in the construction and maintenance of various types of roads. Currently, commercially available modified emulsified asphalt mainly uses SBR for modification, which has advantages such as simple production, convenient construction, and low cost; however, it also has defects such as poor high-temperature performance, poor durability, easy cracking and spalling, and high driving noise. To address these defects, the market has adopted methods such as incorporating high-performance modifying materials or increasing solids content to produce high-viscosity modified emulsified asphalt to improve the road performance of asphalt mixtures. However, the preparation methods are complex, and the asphalt may exhibit problems such as low bond strength, low softening point and dynamic viscosity, or high penetration, resulting in poor high-temperature performance; or reduced ductility at low temperatures (5℃), resulting in poor low-temperature performance. Existing asphalt cannot simultaneously possess good high-temperature and low-temperature performance. Summary of the Invention

[0003] Therefore, the technical problem to be solved by the present invention is to overcome the complexity of the preparation method of modified emulsified asphalt in the prior art, and the fact that the modified emulsified asphalt obtained cannot simultaneously have good bonding strength, penetration, softening point, dynamic viscosity and low temperature (5°C) ductility, and cannot take into account the defects of high temperature performance and low temperature performance. Thus, a composite modified emulsified asphalt, its preparation method and application are provided.

[0004] The composite modified emulsified asphalt provided by this invention has excellent high-temperature performance, low-temperature performance, crack and spalling resistance, and durability.

[0005] To this end, the present invention provides the following technical solution.

[0006] This invention provides a method for preparing composite modified emulsified asphalt, comprising the following steps:

[0007] (1) Preparation of composite modified asphalt: The base asphalt is first heated, and the elasticizer is added to increase the temperature and develop. Then, the viscosity modifier and dispersant are added, followed by the first shearing. Then, the tackifier, plasticizer, coupling agent and stabilizer are added, followed by the second shearing.

[0008] (2) Preparation of soap solution;

[0009] (3) After the composite modified asphalt is cooled, it is mixed with soap solution and then ground into colloids.

[0010] Elasticity enhancers are additives used to improve the elasticity and resistance to deformation of asphalt materials; they include polymer-based elasticity enhancers, rubber-based elasticity enhancers, and chemically modified elasticity enhancers; when preparing asphalt mixtures, elasticity enhancers can improve the durability, crack resistance, and ductility at 5°C of the pavement.

[0011] In one optional embodiment, the mass ratio of the base asphalt, elasticizer, viscosity modifier, dispersant, tackifier, plasticizer, coupling agent and stabilizer is (70-90):(4-8.5):(5-20):(1-2):(0.5-2):(1-2):(1-2):(1-2);

[0012] Preferably, the mass ratio of the base asphalt, elasticizer, viscosity modifier, dispersant, tackifier, plasticizer, coupling agent, and stabilizer is (70-90):(4-8):(5-20):(1-2):(1-2):(1-2):(1-2):(1-2):(1-2);

[0013] In one optional embodiment, the temperature of the first heating is 140-160°C;

[0014] Preferably, the temperature of the first heating is 140-150°C;

[0015] In one optional implementation, the first heating time is 3-4 hours;

[0016] In one optional embodiment, the temperature for the warming development is 180-190°C;

[0017] In one optional implementation, the warming and development time is 45-60 minutes;

[0018] Preferably, the heating and development time is 45-50 minutes;

[0019] In one optional embodiment, the first shearing rate is 6000-8000 r / min;

[0020] Preferably, the first shearing speed is 7500-8000 r / min;

[0021] In one optional implementation, the first shearing time is 20-40 minutes;

[0022] Preferably, the first shearing time is 35-40 minutes;

[0023] In one optional embodiment, the second shearing rate is 2000-3000 r / min;

[0024] Preferably, the second shearing speed is 2500-3000 r / min;

[0025] In one alternative implementation, the second shearing time is 10-20 minutes.

[0026] In one optional embodiment, the base asphalt includes at least one of 50# petroleum asphalt, 70# petroleum asphalt, and 90# petroleum asphalt.

[0027] Preferably, the base asphalt is 70# petroleum asphalt;

[0028] In one alternative embodiment, the elasticizer comprises SBS;

[0029] Preferably, the elasticizer includes at least one of star-shaped SBS particles and linear SBS particles;

[0030] Preferably, the elasticizer is linear SBS particles;

[0031] In one alternative embodiment, the tackifier comprises an epoxy resin;

[0032] Preferably, the tackifier comprises at least one of waterborne epoxy resin or oil-based epoxy resin;

[0033] Preferably, the tackifier is an aqueous epoxy resin;

[0034] Adding elasticizers and tackifiers can change the molecular composition of base asphalt and improve its mechanical and viscosity properties.

[0035] In one optional embodiment, the viscosity modifier includes at least one of silicone oil, rubber oil, and naphthenic oil; adding a viscosity modifier can reduce the interfacial viscosity of asphalt, improve the rheological properties of asphalt, reduce the difficulty of emulsification, and also improve the dispersibility of asphalt.

[0036] Preferably, the viscosity modifier is a naphthenic oil;

[0037] In one alternative embodiment, the dispersant comprises at least one of diatomaceous earth, bentonite, and talc.

[0038] Preferably, the particle size of the dispersant is greater than 500 mesh;

[0039] Preferably, the dispersant is diatomaceous earth;

[0040] Preferably, the dispersant is 1500 mesh diatomaceous earth.

[0041] In one optional embodiment, the plasticizer includes at least one of synthetic vegetable esters, dioctyl maleate, and dioctyl phthalate; the addition of dispersants and plasticizers can improve the dispersion uniformity of the plasticizer and avoid segregation and agglomeration problems caused by the large amount of plasticizer added.

[0042] Preferably, the plasticizer is a synthetic plant ester;

[0043] In one optional embodiment, the coupling agent comprises hexadecyltrimethylammonium bromide; the addition of the coupling agent enhances the chemical interaction between the composite modified asphalt and the emulsifier, strengthens the compatibility between the composite modified asphalt and the emulsifier, and reduces the emulsification difficulty of the composite modified asphalt.

[0044] In one alternative embodiment, the stabilizer includes sulfur powder; the addition of the stabilizer improves the intercalation structure of the modified asphalt and enhances its storage stability.

[0045] Preferably, the stabilizer has a particle size greater than 300 mesh.

[0046] Preferably, the stabilizer is 800-mesh sulfur powder;

[0047] In one optional embodiment, the step of preparing the soap solution includes: heating water to 70-90°C, adding an emulsifier, adjusting the pH value, and stirring until homogeneous.

[0048] Preferably, the steps for preparing the soap solution include: heating water to 70-75°C, adding an emulsifier, adjusting the pH value, and stirring until homogeneous.

[0049] In one optional embodiment, the mass ratio of the base bitumen, water, and emulsifier is (70-90):(40-50):(1-2);

[0050] In one optional embodiment, the pH adjuster for adjusting the pH value includes sulfuric acid;

[0051] Preferably, the concentration of the sulfuric acid is 97-99%;

[0052] In one optional embodiment, the emulsifier includes at least one of quaternary ammonium salt, amide, and sodium lignosulfonate;

[0053] Preferably, the emulsifier is sodium lignosulfonate;

[0054] In one alternative implementation, the pH value is 1.8-2.2.

[0055] In one optional embodiment, the cooled temperature is 130-140°C;

[0056] In one optional embodiment, the temperature of the colloid milling is 50-70°C;

[0057] Preferably, the temperature for colloid milling is 65-70°C;

[0058] In one optional embodiment, the rotational speed of the colloid mill is 3000-5000 r / min;

[0059] Preferably, the rotation speed of the colloid mill is 3700-4300 r / min;

[0060] The optimal second shear speed and the optimal temperature and speed of the colloid mill have a synergistic effect, which can further improve the dynamic viscosity and softening point of asphalt, reduce penetration, and improve high-temperature performance; and improve the cohesion of the asphalt mixture, reduce the amount of sand adhering to the load wheel and the wear of the wet wheel, and improve the durability, high-temperature stability and anti-loosening and anti-stripping ability of the asphalt mixture.

[0061] In one optional embodiment, the colloid milling time is 5-20 minutes.

[0062] The present invention also provides a composite modified emulsified asphalt prepared by the above preparation method.

[0063] The present invention also provides an application of the composite modified emulsified asphalt prepared by the above preparation method in road engineering materials.

[0064] When the composite modified asphalt prepared by this invention is mixed with an emulsifier, it is easy to emulsify, which further improves storage stability and facilitates construction.

[0065] The technical solution of this invention has the following advantages:

[0066] 1. The preparation method of the composite modified emulsified asphalt provided by the present invention includes the following steps: (1) preparing composite modified asphalt: heating the base asphalt for the first time, adding an elasticizer to raise the temperature and develop, then adding a viscosity modifier and a dispersant, performing a first shear, then adding a tackifier, a plasticizer, a coupling agent and a stabilizer, performing a second shear; (2) preparing soap solution; (3) mixing the composite modified asphalt with soap solution after cooling, and grinding the colloid. The composite modified emulsified asphalt prepared by the present invention has higher bonding strength, softening point and dynamic viscosity, lower penetration, and better high-temperature performance; high ductility at 5℃, better low-temperature performance, and excellent anti-cracking and spalling performance and durability; convenient construction, the road surface paved by mixing the prepared composite modified emulsified asphalt with stone can have excellent high-temperature stability, water damage resistance, durability, easy construction, good flatness, reduced road noise, and good driving comfort;

[0067] This invention provides a stepwise preparation method for composite modified asphalt, which allows additives to be better dispersed in the asphalt, refines particle size, and ensures sufficient reaction between the asphalt and additives without causing excessive reaction. This reduces local performance differences (local softening or hardening) due to uneven reaction, improves compatibility, reduces raw material waste, and increases utilization. The preparation method is simple, and the resulting composite modified emulsified asphalt exhibits excellent bond strength, penetration, softening point, dynamic viscosity, ductility at 5°C, cracking and spalling resistance, and durability. Furthermore, the stepwise shearing avoids the high energy required for a single shearing operation, thus reducing energy consumption.

[0068] 2. The method for preparing composite modified emulsified asphalt provided by this invention involves first cooling the composite modified asphalt to 130-140℃, then mixing it with soap solution to obtain composite modified emulsified asphalt. This method further improves the bonding strength, softening point, dynamic viscosity, and 5℃ ductility of the composite modified emulsified asphalt, reduces penetration, optimizes the microstructure of the asphalt, and the increased 5℃ ductility gives the composite modified emulsified asphalt good flexibility and crack resistance even at low temperatures. Furthermore, the obtained composite modified emulsified asphalt has a moderate viscosity, and uniform shearing and dispersion through a grinding and dispersing device further improves the emulsification effect. It also reduces oxidation and aging of asphalt at high temperatures, extending its service life. Simultaneously, it reduces the release of harmful substances, protects the environment, reduces energy consumption, reduces construction difficulty, and improves efficiency.

[0069] This invention incorporates sulfur powder as a stabilizer. The double bonds in the sulfur powder and the elasticizer (SBS particles) undergo a sulfidation reaction, forming a three-dimensional network structure. This reduces the separation of SBS particles from asphalt, extends the storage time of emulsified asphalt, and regulates the interfacial tension between the emulsifier and asphalt, preventing emulsion demulsification and stratification. The asphalt network structure with added sulfur powder is more rigid, with a higher softening point, thus reducing flow deformation at high temperatures. It also enhances the elastic recovery ability of asphalt, and the resulting three-dimensional network structure distributes stress more evenly, delaying the propagation of microcracks and extending the service life of roads. Furthermore, the addition of sulfur powder improves the modification efficiency of SBS, reduces the amount of SBS required, and sulfur powder is widely available, low in cost, and recyclable, saving costs and protecting the environment.

[0070] The preferred stabilizer is 800-mesh sulfur powder, which allows for a more complete sulfurization reaction, a denser three-dimensional network structure, and better high-temperature stability.

[0071] The preferred elasticizer is linear SBS granules; linear SBS granules have better low-temperature and elastic properties and are easier to process; their unique stretching and shrinking characteristics give asphalt self-healing ability, reducing fatigue damage under repeated loading; and their simple structure makes them easier to shear and disperse, forming uniform particles and avoiding agglomeration. They also have low melt viscosity, better compatibility with emulsifiers, extend the shelf life of asphalt, and have low equipment requirements; linear SBS granules are also cheaper than star-shaped SBS granules and require less dosage, which can effectively control costs.

[0072] Waterborne epoxy resin contains no organic solvents, which can significantly reduce the release of volatile organic compounds and reduce pollution; it has a short curing time, can quickly form a waterproof layer, improves construction efficiency, supports multiple construction methods such as brushing and spraying, and is easy to operate; the composite modified emulsified asphalt with added waterborne epoxy resin has a stable molecular structure, maintains its waterproof effect even after long-term immersion, and has excellent resistance to ultraviolet rays, temperature changes, and fatigue, making it suitable for complex climatic environments; it has a high safety factor, the absence of flammable solvents reduces the risk of fire, and the cured waterproof layer is flame-retardant, further ensuring and improving safety performance.

[0073] The preferred dispersant is 1500-mesh diatomaceous earth, which has a larger specific surface area, uniformly adsorbs other components in the composite modified asphalt, prevents agglomeration, and further improves the high-temperature performance, low-temperature performance, crack resistance, spalling resistance and durability of the composite modified emulsified asphalt. Detailed Implementation

[0074] The following embodiments are provided to better understand the present invention and are not limited to the preferred embodiments described. They do not constitute a limitation on the content and scope of protection of the present invention. Any product that is the same as or similar to the present invention, derived by any person under the guidance of the present invention or by combining the features of the present invention with other prior art, falls within the protection scope of the present invention.

[0075] For experiments not specifically described in the examples, the procedures or conditions should be followed according to the conventional experimental procedures described in the literature in this field. Reagents or instruments whose manufacturers are not specified are all commercially available conventional reagent products.

[0076] Example 1

[0077] This embodiment provides a method for preparing composite modified high-viscosity emulsified asphalt, including the following steps:

[0078] (1) By mass, 78 parts of 70# base asphalt were heated in a heating box at 145℃ for 3 hours, 6 parts of linear SBS particles (YH-140, Dongguan Yikai Plastic Raw Materials Co., Ltd.) were added and the temperature was raised to 180℃. The mixture was developed at 180℃ for 45 minutes to obtain the first mixture. 10 parts of naphthenic oil (Hengshui Diyi Petrochemical, 4010) and 2 parts of 1500 mesh diatomaceous earth were added to the first mixture. The mixture was sheared at 8000 r / min for 40 minutes to obtain the second mixture. 1 part of waterborne epoxy resin (Hubei Basite Technology Co., Ltd., BER1398), 1 part of synthetic plant ester (Shandong Guohua Chemical Co., Ltd., ATBC), 1 part of hexadecyltrimethylammonium bromide, and 1 part of 800 mesh sublimed sulfur powder were added to the second mixture. The mixture was sheared at 3000 r / min for 20 minutes to obtain the composite modified high-viscosity asphalt.

[0079] (2) Heat 40 parts of water to 70°C, add 1 part of sodium lignosulfonate (Hubei Shineng Chemical Technology Co., Ltd., CAS8061-51-6), add sulfuric acid (98% analytical grade) to adjust the pH value to 1.8-2.2, stir evenly to obtain soap solution;

[0080] (3) Reduce the temperature of the composite modified high viscosity asphalt to 140℃, set the temperature of the colloid mill to 70℃, add the soap solution and the composite modified high viscosity asphalt to the colloid mill and shear and grind at 4000r / min for 10min to obtain the composite modified high viscosity emulsified asphalt.

[0081] Example 2

[0082] This embodiment provides a method for preparing composite modified high-viscosity emulsified asphalt, including the following steps:

[0083] (1) By mass, 84 parts of 70# base asphalt were heated in a heating box at 145℃ for 3 hours, 3 parts of linear SBS particles (YH-140, Dongguan Yikai Plastic Raw Materials Co., Ltd.) were added and the temperature was raised to 180℃. The mixture was developed at 180℃ for 45 minutes to obtain the first mixture. 8.5 parts of naphthenic oil (Hengshui Diyi Petrochemical, 4010) and 1 part of 1500 mesh diatomaceous earth were added to the first mixture. The mixture was sheared at 8000 r / min for 40 minutes to obtain the second mixture. 0.5 parts of waterborne epoxy resin (Hubei Basite Technology Co., Ltd., BER1398), 1 part of synthetic plant ester (Shandong Guohua Chemical Co., Ltd., ATBC), 1 part of hexadecyltrimethylammonium bromide, and 1 part of 800 mesh sublimed sulfur powder were added to the second mixture. The mixture was sheared at 3000 r / min for 20 minutes to obtain the composite modified high-viscosity asphalt.

[0084] (2) Heat 40 parts of water to 70°C, add 1 part of sodium lignosulfonate (Hubei Shineng Chemical Technology Co., Ltd., CAS8061-51-6), add sulfuric acid (98% analytical grade) to adjust the pH value to 1.8-2.2, stir evenly to obtain soap solution;

[0085] (3) Reduce the temperature of the composite modified high viscosity asphalt to 140℃, set the temperature of the colloid mill to 70℃, add the soap solution and the composite modified high viscosity asphalt to the colloid mill and shear and grind at 4000r / min for 10min to obtain the composite modified high viscosity emulsified asphalt.

[0086] Example 3

[0087] This embodiment provides a method for preparing composite modified high-viscosity emulsified asphalt, including the following steps:

[0088] (1) By mass, 70 parts of 70# base asphalt were heated in a heating box at 145℃ for 3 hours, 8 parts of linear SBS particles (YH-140, Dongguan Yikai Plastic Raw Materials Co., Ltd.) were added and the temperature was raised to 180℃. The mixture was developed at 180℃ for 45 minutes to obtain the first mixture. 13 parts of naphthenic oil (Hengshui Diyi Petrochemical, 4010) and 2 parts of 1500 mesh diatomaceous earth were added to the first mixture. The mixture was sheared at 8000 r / min for 40 minutes to obtain the second mixture. 1 part of waterborne epoxy resin (Baster Technology Co., Ltd., BER1398), 2 parts of synthetic plant ester (Shandong Guohua Chemical Co., Ltd., ATBC), 2 parts of cetyltrimethylammonium bromide, and 2 parts of 800 mesh sublimed sulfur powder were added to the second mixture. The mixture was sheared at 3000 r / min for 20 minutes to obtain the composite modified high-viscosity asphalt.

[0089] (2) Heat 40 parts of water to 70°C, add 1 part of sodium lignosulfonate (Hubei Shineng Chemical Technology Co., Ltd., CAS8061-51-6), add sulfuric acid (98% analytical grade) to adjust the pH value to 1.8-2.2, stir evenly to obtain soap solution;

[0090] (3) Reduce the temperature of the composite modified high viscosity asphalt to 140℃, set the temperature of the colloid mill to 70℃, add the soap solution and the composite modified high viscosity asphalt to the colloid mill and shear and grind at 4000r / min for 10min to obtain the composite modified high viscosity emulsified asphalt.

[0091] Example 4

[0092] This embodiment provides a method for preparing composite modified high-viscosity emulsified asphalt. Compared with Example 1, the difference is that in step (1), shearing at 2000 r / min for 10 min replaces shearing at 3000 r / min for 20 min in Example 1.

[0093] Step (3) is as follows: reduce the temperature of the composite modified high viscosity asphalt to 140℃, set the temperature of the colloid mill to 60℃, add the soap solution and the composite modified high viscosity asphalt to the colloid mill and shear and grind at 3000r / min for 5min to obtain the composite modified high viscosity emulsified asphalt.

[0094] Example 5

[0095] This embodiment provides a method for preparing composite modified high-viscosity emulsified asphalt, including the following steps:

[0096] (1) By mass, 90 parts of 90# base asphalt were heated in a heating box at 160℃ for 4 hours, 4 parts of star-shaped SBS particles (YH-188, Dongguan Yikai Plastic Raw Materials Co., Ltd.) were added and the temperature was raised to 190℃. The mixture was developed at 190℃ for 60 minutes to obtain the first mixture. 20 parts of rubber oil and 2 parts of 800 mesh talc powder were added to the first mixture, and the mixture was sheared at 6000 r / min for 20 minutes to obtain the second mixture. 1 part of oily epoxy resin, 1 part of dioctyl phthalate, 1 part of hexadecyltrimethylammonium bromide, and 1 part of 300 mesh sublimed sulfur powder were added to the second mixture, and the mixture was sheared at 2000 r / min for 10 minutes to obtain the composite modified high-viscosity asphalt.

[0097] (2) Heat 50 parts of water to 90°C, add 2 parts of hexadecyltrimethylammonium bromide (CTAB), add sulfuric acid (98% analytical grade) to adjust the pH to 1.8-2.2, stir evenly to obtain soap solution;

[0098] (3) Reduce the temperature of the composite modified high viscosity asphalt to 130℃, set the temperature of the colloid mill to 50℃, add the soap solution and the composite modified high viscosity asphalt to the colloid mill and shear and grind at 5000r / min for 20min to obtain the composite modified high viscosity emulsified asphalt.

[0099] Comparative Example 1

[0100] This comparative example uses commercially available SBS single-modified emulsified bitumen.

[0101] Comparative Example 2

[0102] This comparative example provides a method for preparing modified emulsified asphalt, comprising the following steps:

[0103] (1) By mass, 78 parts of 70# base asphalt were heated in a heating box at 145℃ for 3 hours, sheared at 8000r / min for 40 minutes in a high-speed shearing apparatus, and 6 parts of linear SBS particles, 10 parts of naphthenic oil, 2 parts of 1500 mesh diatomaceous earth, 1 part of waterborne epoxy resin, 1 part of synthetic plant ester, 1 part of hexadecyltrimethylammonium bromide, and 1 part of 800 mesh sublimed sulfur powder were added and mixed. The mixture was heated to 180℃ and developed at 180℃ for 45 minutes.

[0104] (2) Heat 40 parts of water to 70°C, add 1 part of emulsifier, add sulfuric acid (concentration) to adjust the pH value to 2, stir evenly to obtain soap solution;

[0105] (3) Reduce the temperature of the composite modified high viscosity asphalt to 140℃, set the temperature of the colloid mill to 70℃, add the soap solution and the composite modified high viscosity asphalt to the colloid mill and shear and grind at 4000r / min for 10min to obtain modified emulsified asphalt.

[0106] Comparative Example 3

[0107] This comparative example provides a method for preparing modified emulsified asphalt, comprising the following steps:

[0108] (1) By mass, 78 parts of 70# base asphalt were heated in a heating box at 145℃ for 3 hours, 6 parts of linear SBS particles were added and the temperature was raised to 180℃. The mixture was developed at 180℃ for 45 minutes to obtain the first mixture. 10 parts of naphthenic oil and 2 parts of 1500 mesh diatomaceous earth were added to the first mixture and sheared at 8000 r / min for 40 minutes to obtain the second mixture. 1 part of waterborne epoxy resin, 1 part of synthetic plant ester, 1 part of hexadecyltrimethylammonium bromide, and 1 part of 800 mesh sublimed sulfur powder were added to the second mixture and sheared at 3000 r / min for 20 minutes to obtain the composite modified high-viscosity asphalt.

[0109] (2) Heat 40 parts of water to 70°C, add 1 part of emulsifier, add sulfuric acid (concentration) to adjust the pH value to 2, stir evenly to obtain soap solution;

[0110] (3) Without lowering the temperature of the composite modified high viscosity asphalt, the temperature of the colloid mill is set to 70°C. The soap solution and the composite modified high viscosity asphalt prepared above are directly added to the colloid mill and sheared and ground at 4000r / min for 10min to obtain modified emulsified asphalt.

[0111] Test case

[0112] The modified emulsified asphalt prepared in the above embodiments and comparative examples was subjected to performance tests according to JTG E20—2011 "Test Procedures for Asphalt and Asphalt Mixtures in Highway Engineering" (the bond strength was tested by pull-out test), and the results are shown in Table 1-2.

[0113] The modified emulsified asphalt obtained from the above examples and comparative examples was used to prepare asphalt mixtures according to the asphalt mixture specimen preparation method in JTG E20—2011 "Test Procedures for Asphalt and Asphalt Mixtures in Highway Engineering". The performance was tested according to JTG E20—2011 "Test Procedures for Asphalt and Asphalt Mixtures in Highway Engineering", and the results are shown in Table 3.

[0114] Table 1. Asphalt Test Results

[0115]

[0116] Table 2 Asphalt Test Results

[0117]

[0118]

[0119] Table 3. Test results of asphalt mixtures

[0120]

[0121] As shown in Tables 1-3, the composite modified high-viscosity emulsified asphalt prepared by this invention exhibits excellent high-temperature performance, low-temperature performance, cracking and spalling resistance, and durability. The excellent high-temperature performance of the composite modified high-viscosity emulsified asphalt can be seen from the bond strength, penetration, softening point, and dynamic viscosity. Specifically, high bond strength results in stronger cohesion and structural stability, allowing for stable use at high temperatures and avoiding the structural instability, increased deformation, and interfacial peeling that occur with low bond strength at high temperatures. Low penetration makes the asphalt structure more compact, preventing viscosity decrease and increased fluidity at high temperatures. A high softening point provides stronger resistance to deformation and dynamic stability at high temperatures, as well as superior durability and anti-aging properties. High dynamic viscosity reduces plastic flow at high temperatures, lowering the decay rate.

[0122] The high ductility at 5℃ indicates excellent low-temperature performance and resistance to cracking and spalling. It can still undergo significant plastic deformation at 5℃, absorbing stress, delaying crack initiation, and preventing fractures and other adverse phenomena. The asphalt mixture prepared by the composite modified high-viscosity emulsified asphalt obtained by this invention exhibits good wet wheel abrasion performance, indicating excellent resistance to water damage and further demonstrating good durability. The high cohesion indicates that it can be put into use after rapid curing, saving construction time. The low sand adhesion to the load wheel can effectively control the upper limit of asphalt usage in the mixture, improving the high-temperature stability and resistance to loosening and spalling of the mixture.

[0123] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A method for preparing a complex modified emulsified asphalt, characterized by, Includes the following steps: (1) Preparation of composite modified asphalt: The base asphalt is first heated, and the elasticizer is added to increase the temperature and develop. Then, the viscosity modifier and dispersant are added, followed by the first shearing. Then, the tackifier, plasticizer, coupling agent and stabilizer are added, followed by the second shearing. (2) Preparation of soap solution; (3) After cooling, the composite modified asphalt is mixed with soap solution and then ground into colloids; The mass ratio of the base asphalt, elasticizer, viscosity modifier, dispersant, tackifier, plasticizer, coupling agent and stabilizer is (70-90):(4-8.5):(5-20):(1-2):(0.5-2):(1-2):(1-2):(1-2); The first shearing speed is 7500-8000 r / min; the second shearing speed is 2500-3000 r / min; the temperature of the colloid milling is 65-70℃; the rotation speed of the colloid milling is 3700-4300 r / min; the temperature after cooling is 130-140℃; and the time of the colloid milling is 5-20 min. The first heating temperature is 140-160℃; the first heating time is 3-4 hours; the temperature for the heating and development is 180-190℃; the heating and development time is 45-60 minutes; the first shearing time is 20-40 minutes; the second shearing time is 10-20 minutes. The stabilizer is 800-mesh sulfur powder; the dispersant is 1500-mesh diatomaceous earth.

2. The production method according to claim 1, characterized by, The mass ratio of the base asphalt, elasticizer, viscosity modifier, dispersant, tackifier, plasticizer, coupling agent and stabilizer is (70-90):(4-8):(5-20):(1-2):(1-2):(1-2):(1-2):(1-2):(1-2).

3. The production method according to claim 1 or 2, characterized by, The base asphalt includes at least one of 50# petroleum asphalt, 70# petroleum asphalt, and 90# petroleum asphalt; and / or, The elasticizer includes SBS; and / or, The tackifier includes epoxy resin; and / or, The viscosity modifier includes at least one of silicone oil, rubber oil, and naphthenic oil; and / or, The plasticizer includes at least one of synthetic vegetable esters, dioctyl maleate, and dioctyl phthalate; and / or, The coupling agent includes hexadecyltrimethylammonium bromide.

4. The production method according to claim 3, characterized by, The elasticizer includes at least one of star-shaped SBS particles and linear SBS particles.

5. The preparation method according to claim 3, characterized in that, The tackifier includes at least one of waterborne epoxy resin or oil-based epoxy resin.

6. The preparation method according to claim 3, characterized in that, The base asphalt is 70# petroleum asphalt; and / or, The elasticizer is linear SBS particles; and / or The tackifier is an aqueous epoxy resin; and / or, The viscosity modifier is a naphthenic oil; and / or, The plasticizer is a synthetic plant ester.

7. The preparation method according to claim 1, characterized in that, The steps for preparing the soap solution include: heating water to 70-90℃, adding emulsifier, adjusting the pH value, and stirring evenly to obtain the solution.

8. The preparation method according to claim 7, characterized in that, The mass ratio of the base asphalt, water, and emulsifier is (70-90):(40-50):(1-2); and / or, The pH adjuster for adjusting the pH value includes sulfuric acid; and / or, The emulsifier includes at least one of quaternary ammonium salts, amides, and sodium lignosulfonate; and / or, The pH value is 1.8-2.

2.

9. The preparation method according to claim 8, characterized in that, The concentration of the sulfuric acid is 97-99%.

10. The preparation method according to claim 8, characterized in that, The emulsifier is sodium lignosulfonate.

11. The composite modified emulsified asphalt prepared by the preparation method according to any one of claims 1-10.

12. The application of the composite modified emulsified asphalt prepared by the preparation method according to any one of claims 1-10 in road engineering materials.

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