Anti-rutting anti-fatigue high-modulus asphalt as well as production system and production process thereof

Abstract

The invention discloses anti-rutting anti-fatigue high-modulus asphalt as well as a production system and a production process thereof, and belongs to the technical field of asphalt. The anti-rutting anti-fatigue high-modulus asphalt is prepared from the following raw materials in parts by weight: 75 to 91 parts of matrix asphalt, 6 to 23 parts of rubber powder, 1 to 6 parts of a modifier, 0.5 to 2 parts of an oxidant and 0.1 to 0.4 part of an odor removal stabilizer. According to the anti-rut and anti-fatigue high-modulus asphalt, the raw material composition and the weight part ratio of all the components are limited, the modulus of the matrix asphalt is improved by reacting the oxidizing agent with the matrix asphalt, and the anti-rut and anti-fatigue performance of the asphalt is improved by adding the modifier and the modified and activated rubber powder to act together, so that the anti-rut and anti-fatigue performance of the asphalt is improved, and the anti-rut and anti-fatigue performance of the asphalt is improved. Therefore, the anti-rutting anti-fatigue high-modulus asphalt is obtained.

Description

Technical Field

[0001] The present application relates to a rutting-resistant and fatigue-resistant high-modulus asphalt and a production system and a production process thereof, belonging to the field of asphalt technology. Background Art

[0002] The rapid development of the national economy has brought about excessive traffic volume and axle loads. In addition, due to the combined influence of factors such as road surface design and continuous high temperature weather, some asphalt pavements have experienced severe rutting, which has become one of the most serious forms of damage to asphalt pavements. Therefore, long-life asphalt roads that are resistant to rutting and fatigue have come into being.

[0003] Long-life asphalt roads require the use of high-modulus asphalt mixtures. High-modulus asphalt mixtures are pavement materials with high overall modulus and excellent rutting and fatigue resistance. By increasing the asphalt mixture's modulus parameter, the asphalt layer can be thinner under the same cumulative axle loads, while still meeting or exceeding design load-bearing capacity and service life. This also saves significant amounts of aggregate, which is of great significance in areas where high-quality aggregate is in short supply. The primary purpose of high-modulus asphalt is to improve the modulus parameter used in structural calculations, reduce the asphalt layer thickness, meet structural calculation requirements, and reduce project costs.

[0004] The core of high modulus asphalt mixture is high modulus asphalt. High modulus asphalt is an asphalt that can significantly improve the stiffness modulus and fatigue resistance of asphalt mixture. High modulus asphalt is generally achieved through three channels. The first is to use hard asphalt. As a low-grade heavy-duty asphalt, although the high-temperature performance and rigidity of hard asphalt mixture have been effectively verified, its low-temperature performance is poor and its fatigue and aging resistance are insufficient. The second is to add natural asphalt, which can improve the high-temperature rutting resistance, load-bearing capacity and durability of asphalt mixture. However, the reserves of natural asphalt are limited, and its low-temperature performance is also very poor. The third is to prepare high modulus asphalt by adding modifiers to asphalt. By selecting suitable modifiers and modification processes, the overall modulus and high-temperature performance of the material can be improved while its low-temperature performance is not greatly lost. There are many existing modification methods, and the modification effects are also uneven. Therefore, it is necessary to provide a high modulus asphalt that is both rutting and fatigue resistant. Summary of the Invention

[0005] In order to solve the above problems, a rutting and fatigue resistant high modulus asphalt and its production system and production process are provided. By limiting the raw material composition of the rutting and fatigue resistant high modulus asphalt and the weight ratio of each component, the oxidant reacts with the base asphalt to increase the modulus of the base asphalt, and then by adding a modifier and modified activated rubber powder, the rutting and fatigue resistant properties of the asphalt are improved to obtain a rutting and fatigue resistant high modulus asphalt.

[0006] According to one aspect of the present application, a rutting and fatigue-resistant high modulus asphalt is provided, which comprises the following raw materials in parts by weight: 75-91 parts of base asphalt, 6-23 parts of rubber powder, 1-6 parts of modifier, 0.5-2 parts of oxidant and 0.1-0.4 parts of odor-free stabilizer.

[0007] Specifically, the deodorizing stabilizer includes a deodorizing agent and a stabilizer, wherein the mass ratio of the deodorizing agent to the stabilizer is (0.5-1):1.

[0008] Specifically, the deodorant is a commercially available product, and the stabilizer includes sulfur, one or more of butyl rubber, EPDM rubber, nitrile rubber, and butadiene rubber.

[0009] Specifically, under the action of the stabilizer, a network structure is formed inside the matrix asphalt.

[0010] Optionally, the modifier is a mixed SBS, the block ratio of the mixed SBS is 2.5-3:7.5-8, and the molecular weight is 110,000-230,000.

[0011] Specifically, the present application limits the block ratio of the mixed SBS, which is beneficial to improving the high temperature resistance and fatigue resistance of asphalt; and limits the molecular weight of the mixed SBS, which can provide a sufficient elastic network and maintain good processing performance.

[0012] Optionally, the mixed SBS includes a star-shaped SBS and a linear SBS, and the weight ratio of the star-shaped SBS to the linear SBS is 1:1 to 3:1.

[0013] Specifically, the present application defines the weight ratio of star-shaped SBS and linear SBS, wherein the star-shaped SBS can provide a better three-dimensional network structure and enhance the overall strength of asphalt; the linear SBS can improve the flexibility and fluidity of asphalt, facilitating construction. The two are combined with each other in a specific ratio to achieve the best modification effect and have both anti-rutting and anti-fatigue properties.

[0014] Optionally, the matrix asphalt is 50-70 straight-run petroleum asphalt; the rubber powder is modified activated rubber powder; the mesh size of the modified activated rubber powder is 60-80 mesh; and the oxidant includes one or more of ferrous oxide, phosphoric acid and zinc oxide.

[0015] Specifically, this application uses 50-70 straight-run petroleum asphalt as the base asphalt. Compared with low-grade asphalt, the raw material cost is low and easy to obtain; this application makes specific restrictions on the mesh size of the modified activated rubber. The modified activated rubber powder of this mesh size has a moderate specific surface area, which can ensure that there is sufficient contact area with the base asphalt to fully exert its effect, and will not cause problems such as excessive difficulty in processing and dispersion or agglomeration due to excessively fine particles.

[0016] Specifically, the present application adds an oxidant. On the one hand, the oxidant reacts with the matrix asphalt to increase the modulus of the matrix asphalt; on the other hand, the oxidant can also promote the cross-linking reaction of the system, assist in enhancing the degree of cross-linking of the system, and improve the overall performance of the asphalt.

[0017] Optionally, the preparation of the modified activated rubber powder comprises the following steps:

[0018] S1: placing rubber powder in a reaction vessel, adding toluene, stirring and dispersing the powder evenly, then adding initiator solution and methyl methacrylate, stirring evenly and heating the mixture to carry out graft copolymerization reaction;

[0019] After the reaction in S2 is completed, the nano-titanium dioxide suspension is added to the reaction vessel, and the temperature is raised while continuously stirring the reaction;

[0020] S3 is washed with ethanol, filtered, and dried to obtain modified activated rubber powder.

[0021] Specifically, the modified activated rubber powder is first modified by methyl methacrylate graft copolymerization, and then nano-titanium dioxide is introduced to achieve synergistic effects to improve the comprehensive performance of asphalt.

[0022] Specifically, on the one hand, polymethyl methacrylate chain segments are introduced into the surface of the rubber powder. The polymethyl methacrylate chain segments have good affinity with the polar components in asphalt, which can improve the compatibility and dispersibility between the rubber powder and asphalt. On the other hand, polymethyl methacrylate itself has certain elasticity and flexibility. When grafted onto the rubber powder, it gives the rubber powder a certain elastic recovery ability, which can make the asphalt rebound faster, maintain the flatness of the road surface, and improve the asphalt's anti-rutting ability.

[0023] Specifically, nano-titanium dioxide has a high specific surface area and can serve as a physical cross-linking point in the asphalt system to form a complex network structure. The rubber powder modified by methyl methacrylate graft copolymerization provides more attachment sites for nano-titanium dioxide, enabling it to be better dispersed in the asphalt system and play a role in physical cross-linking. Nano-titanium dioxide further strengthens the interaction between the rubber powder modified by methyl methacrylate graft copolymerization and asphalt, and enhances the improvement effect of the rubber powder modified by methyl methacrylate graft copolymerization on the performance of asphalt. The two work together to comprehensively improve the asphalt's anti-rutting, anti-fatigue and high modulus properties.

[0024] Optionally, the initiator solution is obtained by dissolving the initiator benzoyl peroxide in toluene, wherein the mass of the initiator is 0.5-2% of the mass of methyl methacrylate; the mass of the methyl methacrylate is 5-10% of the mass of the rubber powder; and the mass of the nano-titanium dioxide is 2-7% of the mass of the rubber powder.

[0025] Specifically, the nano-titanium dioxide suspension is obtained by uniformly dispersing the nano-titanium dioxide in cyclohexanone through ultrasonication.

[0026] Specifically, the particle size of nano-titanium dioxide is 20 to 80 nm.

[0027] Specifically, the reaction temperature in S1 is 70-90° C., and the reaction time is 3-5 hours; the reaction temperature in S2 is 100-120° C., and the reaction time is 1-2 hours; the drying temperature in S3 is 80-90° C., and the drying time is 3-5 hours.

[0028] According to another aspect of the present application, a production system for the above-mentioned rutting-resistant and fatigue-resistant high-modulus asphalt is also provided, comprising a feeding system, a reaction system and a development system; the feeding system comprises a storage tank, a first delivery pump, a first powder propeller, a second delivery pump, a second powder propeller and a third delivery pump; the reaction system comprises a first static mixer, a reactor, a spiral heat exchanger, a second static mixer, and a batching tank; the development system comprises a development tank.

[0029] Optionally, the first conveying pump, the first powder propeller and the first static mixer are arranged in sequence between the storage tank and the reactor; the second conveying pump, the spiral heat exchanger, the second powder propeller and the second static mixer are arranged in sequence between the reactor and the batching tank; the third conveying pump is arranged between the batching tank and the development tank.

[0030] Specifically, the reactor is provided with a stirring component of a vacuum pumping component, which can realize stirring reaction under a vacuum state; the reactor also has a temperature control function, which can adjust the temperature according to actual needs.

[0031] Specifically, 1 to 3 spiral heat exchangers can be used in parallel or in series.

[0032] According to another aspect of the present application, a production process for the above-mentioned rutting and fatigue-resistant high modulus asphalt is also provided, comprising the following steps:

[0033] (1) heating the base asphalt in a storage tank and delivering it to a first static mixer via a first delivery pump; and delivering the oxidant to the first static mixer via a first powder propeller to achieve preliminary mixing of the base asphalt and the oxidant;

[0034] (2) The matrix asphalt and the oxidant enter the reactor and react under vacuum to obtain the first matrix asphalt;

[0035] (3) The first matrix asphalt passes through the second delivery pump and the spiral heat exchanger in sequence and enters the second static mixer; the second powder propeller delivers the modified activated rubber powder to the second static mixer, where it is stirred and mixed with the first matrix asphalt to obtain the second matrix asphalt;

[0036] (4) The second matrix asphalt, modifier and odor-free stabilizer are added to the batching tank, and after shearing and grinding, they are sent to the development tank by the third delivery pump for development.

[0037] Specifically, the shearing speed is 3000-4000 rpm, and the shearing time is 30-40 min.

[0038] Optionally, in step (1), the heating temperature of the matrix asphalt is 110-120°C; in step (2), the reaction time is 10-120 minutes, and the reaction temperature is 120-140°C; in step (3), the spiral heat exchanger heats the first matrix asphalt to 180-210°C; the modified activated rubber powder and the first matrix asphalt are stirred and mixed for 1-3 hours; in step (4), the development time is 2-3 hours, and the development temperature is 175-185°C.

[0039] The beneficial effects of this application include but are not limited to:

[0040] 1. According to the present application, a rutting and fatigue resistant high modulus asphalt is provided. By limiting the raw material composition of the rutting and fatigue resistant high modulus asphalt and the weight ratio of each component, an oxidant reacts with the matrix asphalt to increase the modulus of the matrix asphalt, and then by adding a modifier and modified activated rubber powder, the rutting and fatigue resistant properties of the asphalt are improved to obtain a rutting and fatigue resistant high modulus asphalt.

[0041] 2. According to the anti-rutting and anti-fatigue high modulus asphalt of the present application, the reaction of the oxidant and the matrix asphalt is accelerated under a vacuum state. On the one hand, the oxidant reacts with the matrix asphalt to form a gel structure, which can improve the modulus of the asphalt and increase its hardness and wear resistance; on the other hand, the oxidant can promote the cross-linking reaction of rubber powder and modifier, enhance the network structure of the asphalt, which is beneficial to improve its anti-fatigue and anti-aging functions, and make the entire system more stable.

[0042] 3. According to the rutting and fatigue-resistant high modulus asphalt of the present application, a certain proportion of modified activated rubber powder is added to the asphalt. On the one hand, the modified activated rubber powder serves as a filler, which can improve the deformation resistance and toughness of the asphalt, and the modified activated rubber powder can increase the compatibility with the asphalt and improve the mechanical properties of the asphalt. The modified activated rubber powder can increase the viscosity of the asphalt and reduce the occurrence of rutting. On the other hand, the modified activated rubber powder and the modifier work synergistically, so that the asphalt has good anti-rutting performance and good anti-fatigue performance.

[0043] 4. According to the rutting and fatigue-resistant high modulus asphalt of the present application, the present application limits the added modifier and the weight ratio of star-shaped SBS and linear SBS, wherein the star-shaped SBS can provide a better three-dimensional network structure and enhance the overall strength of the asphalt; the linear SBS can improve the flexibility and fluidity of the asphalt and facilitate construction. The two are matched with each other in a specific ratio to achieve the best modification effect and can have both rutting and fatigue resistance.

[0044] 5. According to the production process of a rutting-resistant and fatigue-resistant high modulus asphalt of the present application, the reaction order of adding raw materials is limited, so that the obtained asphalt can have both anti-rutting and anti-fatigue properties, and the process method is simple and easy to promote and utilize. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0046] Figure 1 This is a schematic diagram of a production system for rutting-resistant and fatigue-resistant high-modulus asphalt involved in an embodiment of the present application.

[0047] List of parts and reference numerals:

[0048] 1. Storage tank; 2. First delivery pump; 3. First powder propeller; 4. First static mixer; 5. Reactor; 6. Second delivery pump; 7. Spiral heat exchanger; 8. Second powder propeller; 9. Second static mixer; 10. Mixing tank; 11. Third delivery pump; 12. Development tank. DETAILED DESCRIPTION

[0049] The present application is described in detail below with reference to embodiments, but the present application is not limited to these embodiments.

[0050] Unless otherwise specified, the raw materials in the examples and comparative examples of the present application were purchased through commercial channels.

[0051] Unless otherwise specified, the methods used in the examples and comparative examples of this application are conventional methods in the prior art. The nano-silicon dioxide used in the examples and comparative examples of this application has a particle size of 60 nm, and the nano-titanium dioxide suspension used in the examples and comparative examples of this application is obtained by ultrasonically dispersing nano-titanium dioxide in cyclohexanone.

[0052] like Figure 1As shown, the present application provides a production system for rutting-resistant and fatigue-resistant high-modulus asphalt, including a feeding system, a reaction system and a development system; the feeding system includes a storage tank 1, a first delivery pump 2, a first powder propeller 3, a second delivery pump 6, a second powder propeller 8 and a third delivery pump 11; the reaction system includes a first static mixer 4, a reactor 5, a spiral heat exchanger 7, a second static mixer 9, and a batching tank 10; the development system includes a development tank 12.

[0053] Optionally, the first delivery pump 2, the first powder propeller 3 and the first static mixer 4 are arranged in sequence between the storage tank 1 and the reactor 5; the second delivery pump 6, the spiral heat exchanger 7, the second powder propeller 8 and the second static mixer 9 are arranged in sequence between the reactor 5 and the batching tank 10; the third delivery pump 11 is arranged between the batching tank 10 and the development tank 12.

[0054] Specifically, the reactor 5 is provided with a stirring component of a vacuum pumping component, which can realize stirring reaction under a vacuum state; the reactor 5 also has a temperature control function, which can adjust the temperature according to actual needs.

[0055] Specifically, 1 to 3 spiral heat exchangers 7 can be used in parallel or in series.

[0056] Example 1

[0057] A production process for rutting-resistant and fatigue-resistant high-modulus asphalt:

[0058] (1) 75 parts of base asphalt were heated to 110° C. in a storage tank and delivered to a first static mixer via a first delivery pump. A first powder propeller delivered 0.5 parts of ferrous oxide, an oxidant, to the first static mixer to achieve preliminary mixing of the base asphalt and the oxidant.

[0059] (2) The matrix asphalt and the oxidant are placed in a reactor and reacted under vacuum at a temperature of 120°C for 10 minutes to obtain the first matrix asphalt;

[0060] (3) The first matrix asphalt passes through the second delivery pump and the spiral heat exchanger in sequence. The spiral heat exchanger heats the first matrix asphalt to 180°C and then enters the second static mixer. The second powder propeller delivers 6 parts of modified activated rubber powder to the second static mixer and stirs and mixes it with the first matrix asphalt for 1 hour to obtain the second matrix asphalt.

[0061] (4) The second matrix asphalt and the modifier mixed type SBS 1 part and the odor eliminator stabilizer 0.1 part are added into the batching tank, wherein the odor eliminator is 0.067 parts and the stabilizer sulfur is 0.13 parts. The mixed type SBS block ratio is 3:7.5 and the molecular weight is 230,000. After shearing and grinding, it is sent to the development tank by the third delivery pump for development. Shearing, the shearing speed is 3000rpm, the shearing time is 30min; the development temperature is 175℃, and the development time is 2h.

[0062] The preparation method of modified activated rubber powder is as follows:

[0063] S1: placing rubber powder in a reaction vessel, adding toluene, stirring and dispersing the powder uniformly, then adding an initiator solution and methyl methacrylate, wherein the initiator solution is prepared by dissolving benzoyl peroxide in toluene, the mass of the initiator is 0.5% of the mass of methyl methacrylate, and the mass of methyl methacrylate is 5% of the mass of the rubber powder, stirring uniformly, heating, and performing a graft copolymerization reaction, the reaction temperature is 70°C, and the reaction time is 3 hours;

[0064] After the reaction in S2 is completed, the nano-titanium dioxide suspension is added to the reaction vessel. The mass of the nano-titanium dioxide is 2% of the mass of the rubber powder. The temperature is raised and stirred continuously. The reaction temperature is 100°C and the reaction time is 1 hour.

[0065] S3 was washed with ethanol, filtered, and dried at 80°C for 3 h to obtain modified activated rubber powder.

[0066] Example 2

[0067] A production process for rutting-resistant and fatigue-resistant high-modulus asphalt:

[0068] (1) 91 parts of base asphalt are heated to 120° C. in a storage tank and delivered to a first static mixer via a first delivery pump. A first powder propeller delivers 2 parts of oxidizing phosphoric acid to the first static mixer to achieve preliminary mixing of the base asphalt and the oxidizing agent.

[0069] (2) The matrix asphalt and the oxidant are placed in a reactor and reacted under vacuum at a temperature of 140°C for 120 minutes to obtain the first matrix asphalt;

[0070] (3) The first matrix asphalt passes through the second delivery pump and the spiral heat exchanger in sequence. The spiral heat exchanger heats the first matrix asphalt to 210°C and then enters the second static mixer. The second powder propeller delivers 23 parts of modified activated rubber powder to the second static mixer and stirs and mixes it with the first matrix asphalt for 3 hours to obtain the second matrix asphalt.

[0071] (4) The second matrix asphalt and modifier mixed SBS 6 parts and odor-free stabilizer 0.4 parts are added to the mixing tank, of which odor-free agent 0.2 parts and stabilizer EPDM rubber 0.2 parts, the mixed SBS block ratio is 2.5:8, and the molecular weight is 110,000. After shearing and grinding, it is sent to the development tank by the third delivery pump for development, shearing, shearing speed is 4000rpm, shearing time is 40min; development temperature is 185℃, and development time is 3h.

[0072] The preparation method of modified activated rubber powder is as follows:

[0073] S1: placing rubber powder in a reaction vessel, adding toluene, stirring and dispersing the powder uniformly, then adding an initiator solution and methyl methacrylate, wherein the initiator solution is prepared by dissolving benzoyl peroxide in toluene, the mass of the initiator is 2% of the mass of methyl methacrylate, and the mass of methyl methacrylate is 10% of the mass of the rubber powder, stirring uniformly, heating, and performing a graft copolymerization reaction, the reaction temperature is 90°C, and the reaction time is 5 hours;

[0074] After the reaction in S2 is completed, the nano-titanium dioxide suspension is added to the reaction vessel. The mass of the nano-titanium dioxide is 7% of the mass of the rubber powder. The temperature is raised and stirred continuously. The reaction temperature is 120°C and the reaction time is 2h.

[0075] S3 was washed with ethanol, filtered, and dried at 90°C for 5 h to obtain modified activated rubber powder.

[0076] Example 3

[0077] A production process for rutting-resistant and fatigue-resistant high-modulus asphalt:

[0078] (1) 80 parts of base asphalt are heated to 115° C. in a storage tank and transported to a first static mixer via a first delivery pump. A first powder propeller delivers 1 part of oxidant zinc oxide to the first static mixer to achieve preliminary mixing of the base asphalt and the oxidant;

[0079] (2) The matrix asphalt and the oxidant are placed in a reactor and reacted under vacuum at a temperature of 130°C for 60 minutes to obtain the first matrix asphalt;

[0080] (3) The first matrix asphalt passes through the second delivery pump and the spiral heat exchanger in sequence. The spiral heat exchanger heats the first matrix asphalt to 200°C and then enters the second static mixer. The second powder propeller delivers 10 parts of modified activated rubber powder to the second static mixer and stirs and mixes it with the first matrix asphalt for 2 hours to obtain the second matrix asphalt.

[0081] (4) The second matrix asphalt and the modifier mixed SBS 3 parts and odor-free stabilizer 0.2 parts are added to the batching tank, of which the odor-free agent is 0.1 parts and the stabilizer sulfur is 0.1 parts. The mixed SBS block ratio is 3:8 and the molecular weight is 180,000. After shearing and grinding, it is sent to the development tank by the third delivery pump for development. Shearing, the shear speed is 3500rpm, the shear time is 35min; the development temperature is 180℃, and the development time is 3h.

[0082] The preparation method of modified activated rubber powder is as follows:

[0083] S1: placing rubber powder in a reaction vessel, adding toluene, stirring and dispersing the powder uniformly, then adding an initiator solution and methyl methacrylate, wherein the initiator solution is prepared by dissolving benzoyl peroxide in toluene, the mass of the initiator is 1% of the mass of methyl methacrylate, and the mass of methyl methacrylate is 8% of the mass of the rubber powder, stirring uniformly, heating, and performing a graft copolymerization reaction, the reaction temperature is 80°C, and the reaction time is 4 hours;

[0084] After the reaction in S2 is completed, the nano-titanium dioxide suspension is added to the reaction vessel. The mass of the nano-titanium dioxide is 5% of the mass of the rubber powder. The temperature is raised and stirred continuously. The reaction temperature is 110°C and the reaction time is 2h.

[0085] S3 was washed with ethanol, filtered, and dried at a temperature of 85° C. for 4 h to obtain modified activated rubber powder.

[0086] Example 4

[0087] The difference between Example 4 and Example 3 is that the modifier is star-shaped SBS, and the rest are the same.

[0088] Example 5

[0089] The difference between Example 5 and Example 3 is that the modifier is linear SBS, and the rest are the same.

[0090] Example 6

[0091] The difference between Example 5 and Example 3 is that the weight ratio of the star-shaped SBS to the linear SBS is 10:1, and the rest are the same.

[0092] Example 7

[0093] The difference between Example 7 and Example 3 is that the rubber powder is ordinary rubber powder, and the rest are the same.

[0094] Example 8

[0095] The difference between Example 8 and Example 3 is that the modified activated rubber powder does not include nano-titanium dioxide, and the rest are the same.

[0096] Example 9

[0097] The difference between Example 9 and Example 3 is that the step of grafting methyl methacrylate is not included in the modified activated rubber powder, and the rest are the same.

[0098] Example 10

[0099] The difference between Example 10 and Example 3 is that in the production process of the rutting and fatigue-resistant high modulus asphalt, modified activated rubber powder is added in step (2), and an oxidant is added in step (3), and the rest are the same.

[0100] Comparative Example 1

[0101] The difference between Comparative Example 1 and Example 3 is that no oxidant is included, and the rest are the same.

[0102] Comparative Example 2

[0103] The difference between Comparative Example 2 and Example 3 is that rubber powder is not included, and the rest are the same.

[0104] Experimental Example 1

[0105] The asphalt products prepared in Examples 1 to 9 and Comparative Examples 1 to 2 were tested according to the performance test method in Table 1. The test results are shown in Table 2.

[0106] Table 1 Asphalt product performance testing methods

[0107]

[0108] Table 2 Performance test results

[0109]

[0110]

[0111] As shown in Table 2, the asphalt products of Examples 1-3, which utilize the component ratios of the present invention, all meet the technical requirements for high-modulus modified asphalt and are highly resistant to rutting and fatigue. The needle penetration of Comparative Example 2 decreased significantly, attributed to the lack of rubber powder. The ductility of Comparative Examples 1 and 2 decreased compared to Examples 1-3, attributed to the lack of an oxidant and rubber powder, which reduced ductility. The ductility of Example 9 decreased compared to Examples 1-3, attributed to the lack of a methyl methacrylate grafting step in the modified activated rubber powder, which compromised the rubber powder's ability to improve the asphalt's low-temperature performance and led to the decreased ductility. The mass changes after film oven aging in Examples 8, 10, Comparative Examples 1, and 2 were relatively significant, indicating that their aging resistance was inferior to that of Examples 1-3. The above comparative examples demonstrate that the present invention significantly improves asphalt's anti-rutting and anti-fatigue properties by adding a modifier and modified activated rubber powder. The added modified activated rubber powder, acting as a filler, enhances asphalt's deformation resistance and toughness, increases its compatibility with asphalt, improves its mechanical properties, increases its viscosity, and reduces rutting. Furthermore, the modified activated rubber powder and the modifier work synergistically, imparting both excellent anti-rutting and anti-fatigue properties to the asphalt. Furthermore, the present invention's production process incorporates innovative improvements to the reaction sequence for adding raw materials, resulting in asphalt that possesses both anti-rutting and anti-fatigue properties. This simplifies the process, improves production efficiency, and facilitates widespread adoption.

[0112] The foregoing is merely an embodiment of the present application, and the scope of protection of the present application is not limited by these specific embodiments, but is determined by the claims of the present application. For those skilled in the art, the present application may have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc. made within the technical ideas and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A high modulus asphalt with anti-rutting and anti-fatigue properties, characterized in that: The raw materials include the following in parts by weight: 75-91 parts of base asphalt, 6-23 parts of rubber powder, 1-6 parts of modifier, 0.5-2 parts of oxidant and 0.1-0.4 parts of odor-free stabilizer.

2. The anti-rutting and anti-fatigue high modulus asphalt according to claim 1, characterized in that: The modifier is a mixed SBS, the block ratio of the mixed SBS is 2.5-3:7.5-8, and the molecular weight is 110,000-230,000.

3. The anti-rutting and anti-fatigue high modulus asphalt according to claim 1, characterized in that: The mixed SBS includes star-shaped SBS and linear SBS, and the weight ratio of the star-shaped SBS to the linear SBS is 1:1 to 3:

1.

4. The anti-rutting and anti-fatigue high modulus asphalt according to claim 1, characterized in that: The matrix asphalt is 50-70 straight-run petroleum asphalt; the rubber powder is modified activated rubber powder; the mesh size of the modified activated rubber powder is 60-80 mesh; the oxidant includes one or more of ferrous oxide, phosphoric acid and zinc oxide.

5. The anti-rutting and anti-fatigue high modulus asphalt according to claim 4, characterized in that: The preparation of the modified activated rubber powder comprises the following steps: S1: placing rubber powder in a reaction vessel, adding toluene, stirring and dispersing the powder evenly, then adding initiator solution and methyl methacrylate, stirring evenly and heating the mixture to carry out graft copolymerization reaction; After the reaction in S2 is completed, the nano-titanium dioxide suspension is added to the reaction vessel, and the temperature is raised while continuously stirring the reaction; S3 is washed with ethanol, filtered, and dried to obtain modified activated rubber powder.

6. The anti-rutting and anti-fatigue high modulus asphalt according to claim 1, characterized in that: The initiator solution is prepared by dissolving benzoyl peroxide in toluene, wherein the mass of the initiator is 0.5-2% of the mass of methyl methacrylate; the mass of the methyl methacrylate is 5-10% of the mass of the rubber powder; and the mass of the nano-titanium dioxide is 2-7% of the mass of the rubber powder.

7. A production system for rutting and fatigue-resistant high modulus asphalt according to any one of claims 1 to 6, characterized in that: It includes a feeding system, a reaction system and a development system; the feeding system includes a storage tank, a first delivery pump, a first powder propeller, a second delivery pump, a second powder propeller and a third delivery pump; the reaction system includes a first static mixer, a reactor, a spiral heat exchanger, a second static mixer and a batching tank; the development system includes a development tank.

8. The production system of the rutting and fatigue-resistant high modulus asphalt according to claim 7, characterized in that: The first conveying pump, the first powder propeller and the first static mixer are arranged in sequence between the storage tank and the reactor; the second conveying pump, the spiral heat exchanger, the second powder propeller and the second static mixer are arranged in sequence between the reactor and the batching tank; the third conveying pump is arranged between the batching tank and the development tank.

9. The production process of a rutting and fatigue resistant high modulus asphalt according to any one of claims 1 to 6, characterized in that: The following steps are involved: (1) heating the base asphalt in a storage tank and delivering it to a first static mixer via a first delivery pump; and delivering the oxidant to the first static mixer via a first powder propeller to achieve preliminary mixing of the base asphalt and the oxidant; (2) The matrix asphalt and the oxidant enter the reactor and react under vacuum to obtain the first matrix asphalt; (3) The first matrix asphalt passes through the second delivery pump and the spiral heat exchanger in sequence and enters the second static mixer; The second powder propeller delivers the modified activated rubber powder to the second static mixer, where it is stirred and mixed with the first matrix asphalt to obtain the second matrix asphalt; (4) The second matrix asphalt, modifier and odor-free stabilizer are added to the batching tank, and after shearing and grinding, they are sent to the development tank by the third delivery pump for development.

10. The production process of a rutting and fatigue-resistant high modulus asphalt according to claim 9, characterized in that: In step (1), the heating temperature of the matrix asphalt is 110-120°C; in step (2), the reaction time is 10-120 minutes, and the reaction temperature is 120-140°C; in step (3), the spiral heat exchanger heats the first matrix asphalt to 180-210°C; the modified activated rubber powder and the first matrix asphalt are stirred and mixed for 1-3 hours; in step (4), the development time is 2-3 hours, and the development temperature is 175-185°C.

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