High-elasticity sbs modified asphalt concrete and preparation method thereof

Abstract

The application provides high-elasticity and high-toughness SBS modified asphalt concrete and a preparation method thereof, and relates to the technical field of asphalt mixture engineering materials, and comprises the following raw materials in parts by weight: 100 parts of medium-granularity diabase aggregate, 25-40 parts of modified asphalt and limestone powder, the modified asphalt comprises the following raw materials in parts by weight: 100 parts of base asphalt, 8-12 parts of rubber powder, 4-6 parts of SBS, 3-5 parts of butadiene styrene rubber, 1-2 parts of furfural extract oil, 0.5-1 part of zinc dibenzyl dithiocarbamate, 4-6 parts of C9 petroleum resin, 3-5 parts of plasticizer, 1-1.5 parts of crosslinking agent, the bias-ply tire rubber powder can provide elastic support, the butadiene styrene rubber powder fills molecular chain voids, and the sulfur powder helps to form a dense C-S bond crosslinking network, so that the technical standard of high-elasticity and high-toughness modified asphalt can be met, the high-elasticity and high-toughness performance of the application is obviously improved compared with the existing double-modification system, the application can better adapt to the use requirements of high-cold regions and frequently-frozen-thawed road sections, and is helpful to reduce diseases such as insufficient road surface rebound, low-temperature brittle cracking and fatigue cracking, and prolong the service life of the road surface.

Description

Technical Field

[0001] This invention relates to the field of asphalt mixture engineering materials technology, and in particular to high-elasticity and tough SBS modified asphalt concrete and its preparation method. Background Technology

[0002] In the field of high-grade highway pavement materials, SBS modified asphalt has become the mainstream material for pavement of highways and heavy-load traffic sections due to its excellent low-temperature crack resistance, elastic recovery ability and fatigue resistance. It can effectively extend the service life of the pavement and improve driving comfort and safety. In order to further optimize the elastic network structure, the industry generally adopts the dual modification technology of SBS and powdered styrene-butadiene rubber. By filling the gaps between SBS molecular chains with powdered styrene-butadiene rubber, a dense elastic network is formed. Compared with single SBS modified asphalt, its low-temperature flexibility and elastic recovery ability are improved to a certain extent, and it has been widely used in ordinary high-grade highway projects.

[0003] However, in practical engineering applications, the elastic properties of the aforementioned dual-modification technology using SBS and powdered styrene-butadiene rubber still have significant bottlenecks. It is difficult to meet the stringent requirements for high elasticity and toughness in cold regions, road sections with frequent freeze-thaw cycles, and long-term heavy-load road sections. On the one hand, the molecular chain rigidity of powdered styrene-butadiene rubber is relatively high. Although the elastic network formed after compounding with SBS is relatively dense, the elastic recovery rate is typically only 75%-80%, and the low-temperature bending tensile strain is approximately 2800 με, which cannot meet the technical standards for high-elasticity and toughness modified asphalt. Long-term use can easily lead to insufficient pavement rebound, low-temperature brittleness, and fatigue cracking, seriously affecting the integrity of the pavement structure and its service life. On the other hand, existing technologies often improve the elastic properties of this dual-modification system by increasing the SBS content. However, this significantly increases material costs, and excessive SBS can lead to poor dispersibility and insufficient storage stability in the asphalt system, causing construction problems such as segregation and clumping, making it difficult to achieve a balance between performance and economy.

[0004] Therefore, it is necessary to provide a new type of high-elasticity and tough SBS modified asphalt concrete and its preparation method to solve the above-mentioned technical problems. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention provides highly elastic and tough SBS modified asphalt concrete and its preparation method.

[0006] The high-elasticity and tough SBS modified asphalt concrete provided by this invention comprises the following raw materials in parts by weight: 100 parts of medium-grained diabase aggregate, 25-40 parts of modified asphalt and limestone mineral powder;

[0007] The modified asphalt comprises the following raw materials in parts by weight: 100 parts base asphalt, 8-12 parts rubber powder, 4-6 parts SBS, 3-5 parts styrene-butadiene rubber, 1-2 parts furfural extract oil, 0.5-1 parts zinc dibenzyl dithiocarbamate, 4-6 parts C9 petroleum resin, 3-5 parts plasticizer, and 1-1.5 parts crosslinking agent.

[0008] Furthermore, the base asphalt is selected from petroleum asphalt.

[0009] Furthermore, the rubber powder is selected from 40-80 mesh bias tire rubber powder.

[0010] Furthermore, the SBS is a linear or star-shaped styrene-butadiene-styrene block copolymer.

[0011] Furthermore, the styrene-butadiene rubber is selected from powdered styrene-butadiene rubber with a mesh size of 40 or higher.

[0012] Furthermore, the crosslinking agent is selected from either sulfur powder or dicumyl peroxide.

[0013] Furthermore, the plasticizer is selected from either aromatic oil or paraffin oil.

[0014] Another aspect of the present invention provides a method for preparing high-elasticity and tough SBS modified asphalt concrete, the method comprising the following steps: Step 1: preparing raw materials;

[0015] Step 2: Place the medium-grained diabase aggregate and limestone powder into an oven and heat at 190-205℃ for 4-8 hours to ensure that the medium-grained diabase aggregate is dry and clean, and the limestone powder is dried to a moisture content of less than or equal to 0.5%.

[0016] Step 3: Pour the heated medium-grained diabase and limestone powder into the mixing pot and dry mix at 170-180℃ for 1-2 minutes to make the aggregate temperature uniform;

[0017] Step 4: Modified asphalt mixing: Heat the modified asphalt to 170-180℃, pour it into the mixing pot, and wet mix at 170-180℃ for 2-3 minutes until the aggregate is completely coated with asphalt and there are no white specks, forming a mixture;

[0018] Step 5: Compaction: The mixture is compacted on-site using a double-drum vibratory roller at a temperature of 160-170℃. First, it is statically compacted twice, then vibratory compacted four to six times, and then cooled to room temperature.

[0019] A further method, wherein the preparation of modified asphalt in step four includes the following steps:

[0020] S1: Preheating of asphalt and mixing of furfural extract oil: Heat the base asphalt to 140-190℃, add furfural extract oil, stir at low speed (500-800 rad / min) for 5-30 min, so that the base asphalt is fully swollen to obtain an asphalt mixture.

[0021] S2: SBS swelling and preliminary shearing: Heat the asphalt mixture prepared in S1 to 185-200℃, add SBS, then add plasticizer, stir at medium speed (2000-3000 rad / min) for 30-120 min until SBS is completely swollen and free of particles, to obtain a mixture of asphalt and SBS.

[0022] S3: Addition of zinc dibenzyl dithiocarbamate and high-speed shearing: Add a small amount of zinc dibenzyl dithiocarbamate to the mixture of asphalt and SBS prepared in S2, and perform high-speed shearing at a shearing speed of 4000-5000 rad / min for 10-60 min, with the temperature controlled at 185-195℃, to allow the rubber to initially crosslink and obtain a crosslinked mixture;

[0023] S4: Double rubber compounding and secondary shearing: Cool the crosslinked mixture prepared in S3 to 180±5℃, add styrene-butadiene rubber and rubber powder, stir for 10-30 min, add C9 petroleum resin, and then maintain high-speed shearing, with a shearing speed of 4000-5000 rad / min and a shearing time of 20-40 min, until the rubber particles are uniformly dispersed.

[0024] S5: Add the remaining zinc dibenzyl dithiocarbamate and crosslinking agent from S3 to the mixture prepared in S4. Stir at a medium speed of 1500-2000 rad / min for 60-150 min, and keep the temperature at 180±5℃ to complete the chemical crosslinking of the rubber. Then cool down to 135-145℃ and keep warm for swelling and development for 60-90 min.

[0025] S6: Development: After development is complete, and after inspection to ensure there are no visible particles, modified asphalt is obtained and should be used within 36 hours.

[0026] Compared with related technologies, the high-elasticity and high-toughness SBS modified asphalt concrete and its preparation method provided by the present invention have the following beneficial effects:

[0027] 1. This invention introduces bias-ply tire rubber powder as an elastic rebound node, forming a complementary and synergistic ternary network structure with SBS and powdered styrene-butadiene rubber. The bias-ply tire rubber powder provides elastic support, the powdered styrene-butadiene rubber fills the gaps in the molecular chains, and the sulfur powder helps to form a dense CS bond cross-linking network. The resulting modified asphalt has an elastic recovery rate of 92%-95% at 25℃ and an ductility of ≥32cm at 5℃. The corresponding low-temperature bending failure strain of asphalt concrete at -10℃ is ≥3100με, which meets the technical standards for high-elasticity and toughness modified asphalt. Compared with the existing dual-modification system (elastic recovery rate of 85%-86%, low-temperature bending tensile strain of about 2800με), the high-elasticity and toughness performance of this application is significantly improved, which can better adapt to the use needs of cold regions and road sections with frequent freeze-thaw cycles. It helps to reduce pavement defects such as insufficient rebound, low-temperature brittleness, and fatigue cracking, and extends the service life of the pavement.

[0028] 2. The bias-ply rubber powder provides elastic support, the powdered styrene-butadiene rubber fills the gaps in the molecular chains, and the sulfur powder helps to form a dense CS bond cross-linking network. While improving low-temperature toughness, it also simultaneously optimizes high-temperature rutting resistance. The prepared asphalt concrete has a dynamic stability of 7200-7500 cycles / mm at 60℃, which is higher than the performance standard of ≥5000 cycles / mm for conventional modified asphalt. It is also significantly improved compared to the existing binary rubber system. It breaks through the technical contradiction of "it is difficult to balance the improvement of elasticity and rutting resistance", and can simultaneously meet the high and low temperature complex working conditions of heavy traffic sections, thus broadening the engineering application scenarios of modified asphalt concrete.

[0029] 3. Existing technologies often improve elastic properties by increasing the SBS content. This not only increases material costs but may also lead to poor dispersibility and insufficient storage stability of the asphalt system. However, this application utilizes the synergistic effect of ternary rubber to achieve a performance breakthrough by adding only a certain amount of SBS, which helps to effectively control the procurement cost of modifiers. At the same time, the furfural extract oil and zinc dibenzyl dithiocarbamate added to the formulation can improve the interfacial compatibility between the components, making the softening point difference of the modified asphalt storage stability less than or equal to 1.8℃, reducing construction problems such as segregation and agglomeration, and achieving a good balance between performance improvement, cost control and system stability. Detailed Implementation

[0030] The present invention will be further described below with reference to the embodiments.

[0031] Example 1

[0032] In the specific implementation process, the high-elasticity and toughness SBS modified asphalt concrete includes the following raw materials by weight: 100 parts of medium-grained diabase aggregate, 25 parts of modified asphalt and limestone mineral powder.

[0033] The modified asphalt comprises the following raw materials in parts by weight: 100 parts petroleum asphalt, 8 parts bias tire rubber powder, 4 parts linear SBS, 3 parts powdered styrene-butadiene rubber, 1 part furfural extract oil, 0.5 parts zinc dibenzyl dithiocarbamate, 4 parts C9 petroleum resin, 3 parts aromatic oil, and 1 part sulfur powder.

[0034] The preparation method of high-elasticity and high-toughness SBS modified asphalt concrete specifically includes the following steps:

[0035] Step 1: Prepare the raw materials;

[0036] Step 2: Place the medium-grained diabase aggregate and limestone powder into an oven and heat at 190℃ with forced air for 4 hours to ensure that the medium-grained diabase aggregate is dry and clean, and the limestone powder is dried to a moisture content of less than or equal to 0.5%.

[0037] Step 3: Pour the heated medium-grained diabase and limestone powder into the mixing pot and dry mix at 170°C for 1 minute to ensure uniform aggregate temperature.

[0038] Step 4: Modified asphalt mixing: Heat the modified asphalt to 170℃, pour it into the mixing pot, and wet mix at 170℃ for 2 minutes until the aggregate is completely coated with asphalt and there are no white specks, forming a mixture;

[0039] Step 5: Compaction: The mixture is compacted on-site using a double-drum vibratory roller at a temperature of 160℃. It is first statically compacted twice, then vibrated four times, and then cooled to room temperature.

[0040] It should be noted that the method for preparing modified asphalt in step four includes the following steps:

[0041] S1: Preheating of asphalt and mixing of furfural extract oil: Heat petroleum asphalt to 140°C, add furfural extract oil, stir at low speed (500 rad / min) for 5 min, so that the petroleum asphalt is fully swollen to obtain an asphalt mixture.

[0042] S2: SBS swelling and preliminary shearing: The asphalt mixture prepared in S1 is heated to 185°C, linear SBS is added, followed by aromatic oil. The mixture is stirred at a medium speed of 2000 rad / min for 30 min until the SBS is completely swollen and free of particles, thus obtaining a mixture of asphalt and SBS.

[0043] S3: Addition of zinc dibenzyl dithiocarbamate and high-speed shearing: Add a small amount of zinc dibenzyl dithiocarbamate to the mixture of asphalt and SBS prepared in S2, and perform high-speed shearing at a shearing speed of 4000 rad / min for 10 min, with the temperature controlled at 185℃, to allow the rubber to undergo initial cross-linking and obtain a cross-linked mixture.

[0044] S4: Rubber compounding and secondary shearing: Cool the crosslinked mixture prepared in S3 to 180±5℃, add powdered styrene-butadiene rubber and bias tire rubber powder, stir for 10 min, add C9 petroleum resin, and then maintain high-speed shearing at a shearing speed of 4000 rad / min for 20 min until the rubber particles are uniformly dispersed.

[0045] S5: Add the remaining zinc dibenzyl dithiocarbamate and cross-linking development: Add the remaining zinc dibenzyl dithiocarbamate and sulfur powder from S3 to the mixture prepared in S4, stir at a medium speed of 1500 rad / min for 60 min, and keep the temperature at 180±5℃ to complete the chemical cross-linking of the rubber. Then cool down to 135℃ and keep warm for swelling development for 60 min.

[0046] S6: Development: After development is complete, and after inspection to ensure there are no visible particles, modified asphalt is obtained and should be used within 36 hours.

[0047] Example 2

[0048] In the specific implementation process, the high-elasticity and toughness SBS modified asphalt concrete includes the following raw materials by weight: 100 parts of medium-grained diabase aggregate, 40 parts of modified asphalt and limestone mineral powder.

[0049] The modified asphalt comprises the following raw materials in parts by weight: 100 parts petroleum asphalt, 12 parts bias tire rubber powder, 6 parts linear SBS, 5 parts powdered styrene-butadiene rubber, 2 parts furfural extract oil, 1 part zinc dibenzyl dithiocarbamate, 6 parts C9 petroleum resin, 5 parts aromatic oil, and 1.5 parts sulfur powder.

[0050] The preparation method of high-elasticity and high-toughness SBS modified asphalt concrete specifically includes the following steps:

[0051] Step 1: Prepare the raw materials;

[0052] Step 2: Place the medium-grained diabase aggregate and limestone powder into an oven and heat at 205℃ for 8 hours to ensure that the medium-grained diabase aggregate is dry and clean, and the limestone powder is dried to a moisture content of less than or equal to 0.5%.

[0053] Step 3: Pour the heated medium-grained diabase and limestone powder into the mixing pot and dry mix at 180°C for 2 minutes to ensure uniform aggregate temperature.

[0054] Step 4: Modified asphalt mixing: Heat the modified asphalt to 180℃, pour it into the mixing pot, and wet mix at 180℃ for 3 minutes until the aggregate is completely coated with asphalt and there are no white specks, forming a mixture;

[0055] Step 5: Compaction: The mixture is compacted on-site using a double-drum vibratory roller at a temperature of 170℃. It is first statically compacted twice, then vibrated for six times, and then cooled to room temperature.

[0056] It should be noted that the method for preparing modified asphalt in step four includes the following steps:

[0057] S1: Preheating of asphalt and mixing of furfural extract: Heat petroleum asphalt to 190°C, add furfural extract, stir at low speed (800 rad / min) for 30 min, so that the petroleum asphalt is fully swollen to obtain an asphalt mixture.

[0058] S2: SBS swelling and preliminary shearing: The asphalt mixture prepared in S1 is heated to 200℃, linear SBS is added, followed by aromatic oil. The mixture is stirred at a medium speed of 3000 rad / min for 120 min until the SBS is completely swollen and free of particles, thus obtaining a mixture of asphalt and SBS.

[0059] S3: Addition of zinc dibenzyl dithiocarbamate and high-speed shearing: Add a small amount of zinc dibenzyl dithiocarbamate to the mixture of asphalt and SBS prepared in S2, and perform high-speed shearing at a shearing speed of 5000 rad / min for 60 min, with the temperature controlled at 195℃, to allow the rubber to undergo preliminary cross-linking and obtain a cross-linked mixture.

[0060] S4: Rubber compounding and secondary shearing: Cool the crosslinked mixture prepared in S3 to 180±5℃, add powdered styrene-butadiene rubber and bias tire rubber powder, stir for 30 min, add C9 petroleum resin, and then maintain high-speed shearing at a shearing speed of 5000 rad / min for 40 min until the rubber particles are uniformly dispersed.

[0061] S5: Add the remaining zinc dibenzyl dithiocarbamate and cross-linking development: Add the remaining zinc dibenzyl dithiocarbamate and sulfur powder from S3 to the mixture prepared in S4, stir at a medium speed of 2000 rad / min for 150 min, and keep the temperature at 180±5℃ to complete the chemical cross-linking of the rubber. Then cool down to 145℃ and keep warm for swelling development for 90 min.

[0062] S6: Development: After development is complete, and after inspection to ensure there are no visible particles, modified asphalt is obtained and should be used within 36 hours.

[0063] Example 3

[0064] In the specific implementation process, the high-elasticity and toughness SBS modified asphalt concrete includes the following raw materials by weight: 100 parts of medium-grained diabase aggregate, 30 parts of modified asphalt and limestone mineral powder.

[0065] The modified asphalt comprises the following raw materials in parts by weight: 100 parts petroleum asphalt, 9 parts bias tire rubber powder, 5 parts linear SBS, 4 parts powdered styrene-butadiene rubber, 1.3 parts furfural extract oil, 0.7 parts zinc dibenzyl dithiocarbamate, 5 parts C9 petroleum resin, 4 parts aromatic oil, and 1.3 parts sulfur powder.

[0066] The preparation method of high-elasticity and high-toughness SBS modified asphalt concrete specifically includes the following steps:

[0067] Step 1: Prepare the raw materials;

[0068] Step 2: Place the medium-grained diabase aggregate and limestone powder into an oven and heat at 200℃ with forced air for 6 hours to ensure that the medium-grained diabase aggregate is dry and clean, and the limestone powder is dried to a moisture content of less than or equal to 0.5%.

[0069] Step 3: Pour the heated medium-grained diabase and limestone powder into the mixing pot and dry mix at 175℃ for 1.5 minutes to make the aggregate temperature uniform;

[0070] Step 4: Modified asphalt mixing: Heat the modified asphalt to 175℃, pour it into the mixing pot, and wet mix at 175℃ for 2.3 minutes until the aggregate is completely coated with asphalt and there are no white specks, forming a mixture;

[0071] Step 5: Compaction: The mixture is compacted on-site using a double-drum vibratory roller at a temperature of 165℃. It is first statically compacted twice, then vibrated five times, and then cooled to room temperature.

[0072] It should be noted that the method for preparing modified asphalt in step four includes the following steps:

[0073] S1: Preheating of asphalt and mixing of furfural extract: Heat petroleum asphalt to 160°C, add furfural extract, stir at low speed (650 rad / min) for 20 min, so that the petroleum asphalt is fully swollen to obtain an asphalt mixture.

[0074] S2: SBS swelling and preliminary shearing: The asphalt mixture prepared in S1 is heated to 192°C, linear SBS is added, followed by aromatic oil. The mixture is stirred at a medium speed of 2400 rad / min for 60 min until the SBS is completely swollen and free of particles, thus obtaining a mixture of asphalt and SBS.

[0075] S3: Addition of zinc dibenzyl dithiocarbamate and high-speed shearing: Add a small amount of zinc dibenzyl dithiocarbamate to the mixture of asphalt and SBS prepared in S2, and perform high-speed shearing at a shearing speed of 4500 rad / min for 45 min, with the temperature controlled at 190℃, to allow the rubber to initially crosslink and obtain a crosslinked mixture.

[0076] S4: Rubber compounding and secondary shearing: Cool the crosslinked mixture prepared in S3 to 180±5℃, add powdered styrene-butadiene rubber and bias tire rubber powder, stir for 20 min, add C9 petroleum resin, and then maintain high-speed shearing at a shearing speed of 4300 rad / min for 30 min until the rubber particles are uniformly dispersed.

[0077] S5: Add the remaining zinc dibenzyl dithiocarbamate and cross-linking development: Add the remaining zinc dibenzyl dithiocarbamate and sulfur powder from S3 to the mixture prepared in S4, stir at a medium speed of 1700 rad / min for 120 min, and maintain the temperature at 180±5℃ to complete the chemical cross-linking of the rubber. Then cool down to 140℃ and keep warm for swelling development for 75 min.

[0078] S6: Development: After development is complete, and after inspection to ensure there are no visible particles, modified asphalt is obtained and should be used within 36 hours.

[0079] Example 4

[0080] In the specific implementation process, the high-elasticity and toughness SBS modified asphalt concrete includes the following raw materials by weight: 100 parts of medium-grained diabase aggregate, 25 parts of modified asphalt and limestone mineral powder.

[0081] The modified asphalt comprises the following raw materials in parts by weight: 100 parts petroleum asphalt, 8 parts bias tire rubber powder, 4 parts linear SBS, 3 parts powdered styrene-butadiene rubber, 1 part furfural extract oil, 0.5 parts zinc dibenzyl dithiocarbamate, 4 parts C9 petroleum resin, 3 parts paraffin oil, and 1 part sulfur powder.

[0082] The preparation method of high-elasticity and high-toughness SBS modified asphalt concrete specifically includes the following steps:

[0083] Step 1: Prepare the raw materials;

[0084] Step 2: Place the medium-grained diabase aggregate and limestone powder into an oven and heat at 190℃ with forced air for 4 hours to ensure that the medium-grained diabase aggregate is dry and clean, and the limestone powder is dried to a moisture content of less than or equal to 0.5%.

[0085] Step 3: Pour the heated medium-grained diabase and limestone powder into the mixing pot and dry mix at 170°C for 1 minute to ensure uniform aggregate temperature.

[0086] Step 4: Modified asphalt mixing: Heat the modified asphalt to 170℃, pour it into the mixing pot, and wet mix at 170℃ for 2 minutes until the aggregate is completely coated with asphalt and there are no white specks, forming a mixture;

[0087] Step 5: Compaction: The mixture is compacted on-site using a double-drum vibratory roller at a temperature of 160℃. It is first statically compacted twice, then vibrated four times, and then cooled to room temperature.

[0088] It should be noted that the method for preparing modified asphalt in step four includes the following steps:

[0089] S1: Preheating of asphalt and mixing of furfural extract oil: Heat petroleum asphalt to 140°C, add furfural extract oil, stir at low speed (500 rad / min) for 5 min, so that the petroleum asphalt is fully swollen to obtain an asphalt mixture.

[0090] S2: SBS swelling and preliminary shearing: The asphalt mixture prepared in S1 is heated to 185°C, linear SBS is added, followed by paraffin oil. The mixture is stirred at a medium speed of 2000 rad / min for 30 min until the SBS is completely swollen and free of particles, thus obtaining a mixture of asphalt and SBS.

[0091] S3: Addition of zinc dibenzyl dithiocarbamate and high-speed shearing: Add a small amount of zinc dibenzyl dithiocarbamate to the mixture of asphalt and SBS prepared in S2, and perform high-speed shearing at a shearing speed of 4000 rad / min for 10 min, with the temperature controlled at 185℃, to allow the rubber to undergo initial cross-linking and obtain a cross-linked mixture.

[0092] S4: Rubber compounding and secondary shearing: Cool the crosslinked mixture prepared in S3 to 180±5℃, add powdered styrene-butadiene rubber and bias tire rubber powder, stir for 10 min, add C9 petroleum resin, and then maintain high-speed shearing at a shearing speed of 4000 rad / min for 20 min until the rubber particles are uniformly dispersed.

[0093] S5: Add the remaining zinc dibenzyl dithiocarbamate and cross-linking development: Add the remaining zinc dibenzyl dithiocarbamate and sulfur powder from S3 to the mixture prepared in S4, stir at a medium speed of 1500 rad / min for 60 min, and keep the temperature at 180±5℃ to complete the chemical cross-linking of the rubber. Then cool down to 135℃ and keep warm for swelling development for 60 min.

[0094] S6: Development: After development is complete, and after inspection to ensure there are no visible particles, modified asphalt is obtained and should be used within 36 hours.

[0095] Example 5

[0096] In the specific implementation process, the high-elasticity and toughness SBS modified asphalt concrete includes the following raw materials by weight: 100 parts of medium-grained diabase aggregate, 40 parts of modified asphalt and limestone mineral powder.

[0097] The modified asphalt comprises the following raw materials in parts by weight: 100 parts petroleum asphalt, 12 parts bias tire rubber powder, 6 parts linear SBS, 5 parts powdered styrene-butadiene rubber, 2 parts furfural extract oil, 1 part zinc dibenzyl dithiocarbamate, 6 parts C9 petroleum resin, 5 parts paraffin oil, and 1.5 parts sulfur powder.

[0098] The preparation method of high-elasticity and high-toughness SBS modified asphalt concrete specifically includes the following steps:

[0099] Step 1: Prepare the raw materials;

[0100] Step 2: Place the medium-grained diabase aggregate and limestone powder into an oven and heat at 205℃ for 8 hours to ensure that the medium-grained diabase aggregate is dry and clean, and the limestone powder is dried to a moisture content of less than or equal to 0.5%.

[0101] Step 3: Pour the heated medium-grained diabase and limestone powder into the mixing pot and dry mix at 180°C for 2 minutes to ensure uniform aggregate temperature.

[0102] Step 4: Modified asphalt mixing: Heat the modified asphalt to 180℃, pour it into the mixing pot, and wet mix at 180℃ for 3 minutes until the aggregate is completely coated with asphalt and there are no white specks, forming a mixture;

[0103] Step 5: Compaction: The mixture is compacted on-site using a double-drum vibratory roller at a temperature of 170℃. It is first statically compacted twice, then vibrated for six times, and then cooled to room temperature.

[0104] It should be noted that the method for preparing modified asphalt in step four includes the following steps:

[0105] S1: Preheating of asphalt and mixing of furfural extract: Heat petroleum asphalt to 190°C, add furfural extract, stir at low speed (800 rad / min) for 30 min, so that the petroleum asphalt is fully swollen to obtain an asphalt mixture.

[0106] S2: SBS swelling and preliminary shearing: The asphalt mixture prepared in S1 is heated to 200°C, linear SBS is added, followed by paraffin oil. The mixture is stirred at a medium speed of 3000 rad / min for 120 min until the SBS is completely swollen and free of particles, thus obtaining a mixture of asphalt and SBS.

[0107] S3: Addition of zinc dibenzyl dithiocarbamate and high-speed shearing: Add a small amount of zinc dibenzyl dithiocarbamate to the mixture of asphalt and SBS prepared in S2, and perform high-speed shearing at a shearing speed of 5000 rad / min for 60 min, with the temperature controlled at 195℃, to allow the rubber to undergo preliminary cross-linking and obtain a cross-linked mixture.

[0108] S4: Rubber compounding and secondary shearing: Cool the crosslinked mixture prepared in S3 to 180±5℃, add powdered styrene-butadiene rubber and bias tire rubber powder, stir for 30 min, add C9 petroleum resin, and then maintain high-speed shearing at a shearing speed of 5000 rad / min for 40 min until the rubber particles are uniformly dispersed.

[0109] S5: Add the remaining zinc dibenzyl dithiocarbamate and cross-linking development: Add the remaining zinc dibenzyl dithiocarbamate and sulfur powder from S3 to the mixture prepared in S4, stir at a medium speed of 2000 rad / min for 150 min, and keep the temperature at 180±5℃ to complete the chemical cross-linking of the rubber. Then cool down to 145℃ and keep warm for swelling development for 90 min.

[0110] S6: Development: After development is complete, and after inspection to ensure there are no visible particles, modified asphalt is obtained and should be used within 36 hours.

[0111] Example 6

[0112] In the specific implementation process, the high-elasticity and toughness SBS modified asphalt concrete includes the following raw materials by weight: 100 parts of medium-grained diabase aggregate, 25-40 parts of modified asphalt and limestone mineral powder.

[0113] The modified asphalt comprises the following raw materials in parts by weight: 100 parts petroleum asphalt, 9 parts bias tire rubber powder, 5 parts linear SBS, 4 parts powdered styrene-butadiene rubber, 1.3 parts furfural extract oil, 0.7 parts zinc dibenzyl dithiocarbamate, 5 parts C9 petroleum resin, 4 parts paraffin oil, and 1.3 parts sulfur powder.

[0114] The preparation method of high-elasticity and high-toughness SBS modified asphalt concrete specifically includes the following steps:

[0115] Step 1: Prepare the raw materials;

[0116] Step 2: Place the medium-grained diabase aggregate and limestone powder into an oven and heat at 200℃ with forced air for 6 hours to ensure that the medium-grained diabase aggregate is dry and clean, and the limestone powder is dried to a moisture content of less than or equal to 0.5%.

[0117] Step 3: Pour the heated medium-grained diabase and limestone powder into the mixing pot and dry mix at 175℃ for 1.5 minutes to make the aggregate temperature uniform;

[0118] Step 4: Modified asphalt mixing: Heat the modified asphalt to 175℃, pour it into the mixing pot, and wet mix at 175℃ for 2.3 minutes until the aggregate is completely coated with asphalt and there are no white specks, forming a mixture;

[0119] Step 5: Compaction: The mixture is compacted on-site using a double-drum vibratory roller at a temperature of 165℃. It is first statically compacted twice, then vibrated five times, and then cooled to room temperature.

[0120] It should be noted that the method for preparing modified asphalt in step four includes the following steps:

[0121] S1: Preheating of asphalt and mixing of furfural extract: Heat petroleum asphalt to 160°C, add furfural extract, stir at low speed (650 rad / min) for 20 min, so that the petroleum asphalt is fully swollen to obtain an asphalt mixture.

[0122] S2: SBS swelling and preliminary shearing: The asphalt mixture prepared in S1 is heated to 192°C, linear SBS is added, followed by paraffin oil. The mixture is stirred at a medium speed of 2400 rad / min for 60 min until the SBS is completely swollen and free of particles, thus obtaining a mixture of asphalt and SBS.

[0123] S3: Addition of zinc dibenzyl dithiocarbamate and high-speed shearing: Add a small amount of zinc dibenzyl dithiocarbamate to the mixture of asphalt and SBS prepared in S2, and perform high-speed shearing at a shearing speed of 4500 rad / min for 45 min, with the temperature controlled at 190℃, to allow the rubber to initially crosslink and obtain a crosslinked mixture.

[0124] S4: Rubber compounding and secondary shearing: Cool the crosslinked mixture prepared in S3 to 180±5℃, add powdered styrene-butadiene rubber and bias tire rubber powder, stir for 20 min, add C9 petroleum resin, and then maintain high-speed shearing at a shearing speed of 4300 rad / min for 30 min until the rubber particles are uniformly dispersed.

[0125] S5: Add the remaining zinc dibenzyl dithiocarbamate and cross-linking development: Add the remaining zinc dibenzyl dithiocarbamate and sulfur powder from S3 to the mixture prepared in S4, stir at a medium speed of 1700 rad / min for 120 min, and maintain the temperature at 180±5℃ to complete the chemical cross-linking of the rubber. Then cool down to 140℃ and keep warm for swelling development for 75 min.

[0126] S6: Development: After development is complete, and after inspection to ensure there are no visible particles, modified asphalt is obtained and should be used within 36 hours.

[0127] Example 7

[0128] In the specific implementation process, the high-elasticity and toughness SBS modified asphalt concrete includes the following raw materials by weight: 100 parts of medium-grained diabase aggregate, 25 parts of modified asphalt and limestone mineral powder.

[0129] The modified asphalt comprises the following raw materials in parts by weight: 100 parts petroleum asphalt, 8 parts bias tire rubber powder, 4 parts linear SBS, 3 parts powdered styrene-butadiene rubber, 1 part furfural extract oil, 0.5 parts zinc dibenzyl dithiocarbamate, 4 parts C9 petroleum resin, 3 parts aromatic oil, and 1 part dicumyl peroxide.

[0130] The preparation method of high-elasticity and high-toughness SBS modified asphalt concrete specifically includes the following steps:

[0131] Step 1: Prepare the raw materials;

[0132] Step 2: Place the medium-grained diabase aggregate and limestone powder into an oven and heat at 190℃ with forced air for 4 hours to ensure that the medium-grained diabase aggregate is dry and clean, and the limestone powder is dried to a moisture content of less than or equal to 0.5%.

[0133] Step 3: Pour the heated medium-grained diabase and limestone powder into the mixing pot and dry mix at 170°C for 1 minute to ensure uniform aggregate temperature.

[0134] Step 4: Modified asphalt mixing: Heat the modified asphalt to 170℃, pour it into the mixing pot, and wet mix at 170℃ for 2 minutes until the aggregate is completely coated with asphalt and there are no white specks, forming a mixture;

[0135] Step 5: Compaction: The mixture is compacted on-site using a double-drum vibratory roller at a temperature of 160℃. It is first statically compacted twice, then vibrated four times, and then cooled to room temperature.

[0136] It should be noted that the method for preparing modified asphalt in step four includes the following steps:

[0137] S1: Preheating of asphalt and mixing of furfural extract oil: Heat petroleum asphalt to 140°C, add furfural extract oil, stir at low speed (500 rad / min) for 5 min, so that the petroleum asphalt is fully swollen to obtain an asphalt mixture.

[0138] S2: SBS swelling and preliminary shearing: The asphalt mixture prepared in S1 is heated to 185°C, linear SBS is added, followed by aromatic oil. The mixture is stirred at a medium speed of 2000 rad / min for 30 min until the SBS is completely swollen and free of particles, thus obtaining a mixture of asphalt and SBS.

[0139] S3: Addition of zinc dibenzyl dithiocarbamate and high-speed shearing: Add a small amount of zinc dibenzyl dithiocarbamate to the mixture of asphalt and SBS prepared in S2, and perform high-speed shearing at a shearing speed of 4000 rad / min for 10 min, with the temperature controlled at 185℃, to allow the rubber to undergo initial cross-linking and obtain a cross-linked mixture.

[0140] S4: Rubber compounding and secondary shearing: Cool the crosslinked mixture prepared in S3 to 180±5℃, add powdered styrene-butadiene rubber and bias tire rubber powder, stir for 10 min, add C9 petroleum resin, and then maintain high-speed shearing at a shearing speed of 4000 rad / min for 20 min until the rubber particles are uniformly dispersed.

[0141] S5: Add the remaining zinc dibenzyl dithiocarbamate and cross-linking development: Add the remaining zinc dibenzyl dithiocarbamate and dicumyl peroxide from S3 to the mixture prepared in S4, stir at a medium speed of 1500 rad / min for 60 min, and maintain the temperature at 180±5℃ to complete the chemical cross-linking of the rubber. Then cool down to 135℃ and keep warm for swelling development for 60 min.

[0142] S6: Development: After development is complete, and after inspection to ensure there are no visible particles, modified asphalt is obtained and should be used within 36 hours.

[0143] Example 8

[0144] In the specific implementation process, the high-elasticity and toughness SBS modified asphalt concrete includes the following raw materials by weight: 100 parts of medium-grained diabase aggregate, 40 parts of modified asphalt and limestone mineral powder.

[0145] The modified asphalt comprises the following raw materials in parts by weight: 100 parts petroleum asphalt, 12 parts bias tire rubber powder, 6 parts linear SBS, 5 parts powdered styrene-butadiene rubber, 2 parts furfural extract oil, 1 part zinc dibenzyl dithiocarbamate, 6 parts C9 petroleum resin, 5 parts aromatic oil, and 1.5 parts dicumyl peroxide.

[0146] The preparation method of high-elasticity and high-toughness SBS modified asphalt concrete specifically includes the following steps:

[0147] Step 1: Prepare the raw materials;

[0148] Step 2: Place the medium-grained diabase aggregate and limestone powder into an oven and heat at 205℃ for 8 hours to ensure that the medium-grained diabase aggregate is dry and clean, and the limestone powder is dried to a moisture content of less than or equal to 0.5%.

[0149] Step 3: Pour the heated medium-grained diabase and limestone powder into the mixing pot and dry mix at 180°C for 2 minutes to ensure uniform aggregate temperature.

[0150] Step 4: Modified asphalt mixing: Heat the modified asphalt to 180℃, pour it into the mixing pot, and wet mix at 180℃ for 3 minutes until the aggregate is completely coated with asphalt and there are no white specks, forming a mixture;

[0151] Step 5: Compaction: The mixture is compacted on-site using a double-drum vibratory roller at a temperature of 170℃. It is first statically compacted twice, then vibrated for six times, and then cooled to room temperature.

[0152] It should be noted that the method for preparing modified asphalt in step four includes the following steps:

[0153] S1: Preheating of asphalt and mixing of furfural extract: Heat petroleum asphalt to 190°C, add furfural extract, stir at low speed (800 rad / min) for 30 min, so that the petroleum asphalt is fully swollen to obtain an asphalt mixture.

[0154] S2: SBS swelling and preliminary shearing: The asphalt mixture prepared in S1 is heated to 200℃, linear SBS is added, followed by aromatic oil. The mixture is stirred at a medium speed of 3000 rad / min for 120 min until the SBS is completely swollen and free of particles, thus obtaining a mixture of asphalt and SBS.

[0155] S3: Addition of zinc dibenzyl dithiocarbamate and high-speed shearing: Add a small amount of zinc dibenzyl dithiocarbamate to the mixture of asphalt and SBS prepared in S2, and perform high-speed shearing at a shearing speed of 5000 rad / min for 60 min, with the temperature controlled at 195℃, to allow the rubber to undergo preliminary cross-linking and obtain a cross-linked mixture.

[0156] S4: Rubber compounding and secondary shearing: Cool the crosslinked mixture prepared in S3 to 180±5℃, add powdered styrene-butadiene rubber and bias tire rubber powder, stir for 30 min, add C9 petroleum resin, and then maintain high-speed shearing at a shearing speed of 5000 rad / min for 40 min until the rubber particles are uniformly dispersed.

[0157] S5: Add the remaining zinc dibenzyl dithiocarbamate and cross-linking development: Add the remaining zinc dibenzyl dithiocarbamate and dicumyl peroxide from S3 to the mixture prepared in S4, stir at a medium speed of 2000 rad / min for 150 min, and maintain the temperature at 180±5℃ to complete the chemical cross-linking of the rubber. Then, cool down to 145℃ and keep warm for swelling development for 90 min.

[0158] S6: Development: After development is complete, and after inspection to ensure there are no visible particles, modified asphalt is obtained and should be used within 36 hours.

[0159] Example 9

[0160] In the specific implementation process, the high-elasticity and toughness SBS modified asphalt concrete includes the following raw materials by weight: 100 parts of medium-grained diabase aggregate, 30 parts of modified asphalt and limestone mineral powder.

[0161] The modified asphalt comprises the following raw materials in parts by weight: 100 parts petroleum asphalt, 9 parts bias tire rubber powder, 5 parts linear SBS, 4 parts powdered styrene-butadiene rubber, 1.3 parts furfural extract oil, 0.7 parts zinc dibenzyl dithiocarbamate, 5 parts C9 petroleum resin, 4 parts aromatic oil, and 1.3 parts dicumyl peroxide.

[0162] The preparation method of high-elasticity and high-toughness SBS modified asphalt concrete specifically includes the following steps:

[0163] Step 1: Prepare the raw materials;

[0164] Step 2: Place the medium-grained diabase aggregate and limestone powder into an oven and heat at 200℃ with forced air for 6 hours to ensure that the medium-grained diabase aggregate is dry and clean, and the limestone powder is dried to a moisture content of less than or equal to 0.5%.

[0165] Step 3: Pour the heated medium-grained diabase and limestone powder into the mixing pot and dry mix at 175℃ for 1.5 minutes to make the aggregate temperature uniform;

[0166] Step 4: Modified asphalt mixing: Heat the modified asphalt to 175℃, pour it into the mixing pot, and wet mix at 175℃ for 2.3 minutes until the aggregate is completely coated with asphalt and there are no white specks, forming a mixture;

[0167] Step 5: Compaction: The mixture is compacted on-site using a double-drum vibratory roller at a temperature of 165℃. It is first statically compacted twice, then vibrated five times, and then cooled to room temperature.

[0168] It should be noted that the method for preparing modified asphalt in step four includes the following steps:

[0169] S1: Preheating of asphalt and mixing of furfural extract: Heat petroleum asphalt to 160°C, add furfural extract, stir at low speed (650 rad / min) for 20 min, so that the petroleum asphalt is fully swollen to obtain an asphalt mixture.

[0170] S2: SBS swelling and preliminary shearing: The asphalt mixture prepared in S1 is heated to 192°C, linear SBS is added, followed by aromatic oil. The mixture is stirred at a medium speed of 2400 rad / min for 60 min until the SBS is completely swollen and free of particles, thus obtaining a mixture of asphalt and SBS.

[0171] S3: Addition of zinc dibenzyl dithiocarbamate and high-speed shearing: Add a small amount of zinc dibenzyl dithiocarbamate to the mixture of asphalt and SBS prepared in S2, and perform high-speed shearing at a shearing speed of 4500 rad / min for 45 min, with the temperature controlled at 190℃, to allow the rubber to initially crosslink and obtain a crosslinked mixture.

[0172] S4: Rubber compounding and secondary shearing: Cool the crosslinked mixture prepared in S3 to 180±5℃, add powdered styrene-butadiene rubber and bias tire rubber powder, stir for 20 min, add C9 petroleum resin, and then maintain high-speed shearing at a shearing speed of 4300 rad / min for 30 min until the rubber particles are uniformly dispersed.

[0173] S5: Add the remaining zinc dibenzyl dithiocarbamate and cross-linking development: Add the remaining zinc dibenzyl dithiocarbamate and dicumyl peroxide from S3 to the mixture prepared in S4, stir at a medium speed of 1700 rad / min for 120 min, and maintain the temperature at 180±5℃ to complete the chemical cross-linking of the rubber. Then, cool down to 140℃ and keep warm for swelling development for 75 min.

[0174] S6: Development: After development is complete, and after inspection to ensure there are no visible particles, modified asphalt is obtained and should be used within 36 hours.

[0175] Comparative Example 1

[0176] In the specific implementation process, the high-elasticity and toughness SBS modified asphalt concrete includes the following raw materials by weight: 100 parts of medium-grained diabase aggregate, 25 parts of modified asphalt and limestone mineral powder.

[0177] The modified asphalt comprises the following raw materials in parts by weight: 100 parts petroleum asphalt, 8 parts bias tire rubber powder, 4 parts linear SBS, 1 part furfural extract oil, 0.5 parts zinc dibenzyl dithiocarbamate, 4 parts C9 petroleum resin, 3 parts aromatic oil, and 1 part sulfur powder.

[0178] The preparation method of high-elasticity and high-toughness SBS modified asphalt concrete specifically includes the following steps:

[0179] Step 1: Prepare the raw materials;

[0180] Step 2: Place the medium-grained diabase aggregate and limestone powder into an oven and heat at 190℃ with forced air for 4 hours to ensure that the medium-grained diabase aggregate is dry and clean, and the limestone powder is dried to a moisture content of less than or equal to 0.5%.

[0181] Step 3: Pour the heated medium-grained diabase and limestone powder into the mixing pot and dry mix at 170°C for 1 minute to ensure uniform aggregate temperature.

[0182] Step 4: Modified asphalt mixing: Heat the modified asphalt to 170℃, pour it into the mixing pot, and wet mix at 170℃ for 2 minutes until the aggregate is completely coated with asphalt and there are no white specks, forming a mixture;

[0183] Step 5: Compaction: The mixture is compacted on-site using a double-drum vibratory roller at a temperature of 160℃. It is first statically compacted twice, then vibrated four times, and then cooled to room temperature.

[0184] It should be noted that the method for preparing modified asphalt in step four includes the following steps:

[0185] S1: Preheating of asphalt and mixing of furfural extract oil: Heat petroleum asphalt to 140°C, add furfural extract oil, stir at low speed (500 rad / min) for 5 min, so that the petroleum asphalt is fully swollen to obtain an asphalt mixture.

[0186] S2: SBS swelling and preliminary shearing: The asphalt mixture prepared in S1 is heated to 185°C, linear SBS is added, followed by aromatic oil. The mixture is stirred at a medium speed of 2000 rad / min for 30 min until the SBS is completely swollen and free of particles, thus obtaining a mixture of asphalt and SBS.

[0187] S3: Addition of zinc dibenzyl dithiocarbamate and high-speed shearing: Add a small amount of zinc dibenzyl dithiocarbamate to the mixture of asphalt and SBS prepared in S2, and perform high-speed shearing at a shearing speed of 4000 rad / min for 10 min, with the temperature controlled at 185℃, to allow the rubber to undergo initial cross-linking and obtain a cross-linked mixture.

[0188] S4: Rubber compounding and secondary shearing: Cool the crosslinked mixture prepared in S3 to 180±5℃, add 8 parts of bias tire rubber powder, stir for 10 min, add C9 petroleum resin, and then maintain high-speed shearing at a shearing speed of 4000 rad / min for 20 min until the rubber particles are uniformly dispersed.

[0189] S5: Add the remaining zinc dibenzyl dithiocarbamate and cross-linking development: Add the remaining zinc dibenzyl dithiocarbamate and sulfur powder from S3 to the mixture prepared in S4, stir at a medium speed of 1500 rad / min for 60 min, and keep the temperature at 180±5℃ to complete the chemical cross-linking of the rubber. Then cool down to 135℃ and keep warm for swelling development for 60 min.

[0190] S6: Development: After development is complete, and after inspection to ensure there are no visible particles, modified asphalt is obtained and should be used within 36 hours.

[0191] Comparative Example 2

[0192] In the specific implementation process, the high-elasticity and toughness SBS modified asphalt concrete includes the following raw materials by weight: 100 parts of medium-grained diabase aggregate, 25 parts of modified asphalt and limestone mineral powder.

[0193] The modified asphalt comprises the following raw materials in parts by weight: 100 parts petroleum asphalt, 4 parts linear SBS, 3 parts powdered styrene-butadiene rubber, 1 part furfural extract, 0.5 parts zinc dibenzyl dithiocarbamate, 4 parts C9 petroleum resin, 3 parts aromatic oil, and 1 part sulfur powder.

[0194] The preparation method of high-elasticity and high-toughness SBS modified asphalt concrete specifically includes the following steps:

[0195] Step 1: Prepare the raw materials;

[0196] Step 2: Place the medium-grained diabase aggregate and limestone powder into an oven and heat at 190℃ with forced air for 4 hours to ensure that the medium-grained diabase aggregate is dry and clean, and the limestone powder is dried to a moisture content of less than or equal to 0.5%.

[0197] Step 3: Pour the heated medium-grained diabase and limestone powder into the mixing pot and dry mix at 170°C for 1 minute to ensure uniform aggregate temperature.

[0198] Step 4: Modified asphalt mixing: Heat the modified asphalt to 170℃, pour it into the mixing pot, and wet mix at 170℃ for 2 minutes until the aggregate is completely coated with asphalt and there are no white specks, forming a mixture;

[0199] Step 5: Compaction: The mixture is compacted on-site using a double-drum vibratory roller at a temperature of 160℃. It is first statically compacted twice, then vibrated four times, and then cooled to room temperature.

[0200] It should be noted that the method for preparing modified asphalt in step four includes the following steps:

[0201] S1: Preheating of asphalt and mixing of furfural extract oil: Heat petroleum asphalt to 140°C, add furfural extract oil, stir at low speed (500 rad / min) for 5 min, so that the petroleum asphalt is fully swollen to obtain an asphalt mixture.

[0202] S2: SBS swelling and preliminary shearing: The asphalt mixture prepared in S1 is heated to 185°C, linear SBS is added, followed by aromatic oil. The mixture is stirred at a medium speed of 2000 rad / min for 30 min until the SBS is completely swollen and free of particles, thus obtaining a mixture of asphalt and SBS.

[0203] S3: Addition of zinc dibenzyl dithiocarbamate and high-speed shearing: Add a small amount of zinc dibenzyl dithiocarbamate to the mixture of asphalt and SBS prepared in S2, and perform high-speed shearing at a shearing speed of 4000 rad / min for 10 min, with the temperature controlled at 185℃, to allow the rubber to undergo initial cross-linking and obtain a cross-linked mixture.

[0204] S4: Rubber compounding and secondary shearing: Cool the crosslinked mixture prepared in S3 to 180±5℃, add powdered styrene-butadiene rubber, stir for 10 min, add C9 petroleum resin, and then maintain high-speed shearing at a shearing speed of 4000 rad / min for 20 min until the rubber particles are uniformly dispersed.

[0205] S5: Add the remaining zinc dibenzyl dithiocarbamate and cross-linking development: Add the remaining zinc dibenzyl dithiocarbamate and sulfur powder from S3 to the mixture prepared in S4, stir at a medium speed of 1500 rad / min for 60 min, and keep the temperature at 180±5℃ to complete the chemical cross-linking of the rubber. Then cool down to 135℃ and keep warm for swelling development for 60 min.

[0206] S6: Development: After development is complete, and after inspection to ensure there are no visible particles, modified asphalt is obtained and should be used within 36 hours.

[0207] Comparative Example 3

[0208] In the specific implementation process, the high-elasticity and toughness SBS modified asphalt concrete includes the following raw materials by weight: 100 parts of medium-grained diabase aggregate, 25 parts of modified asphalt and limestone mineral powder.

[0209] The modified asphalt comprises the following raw materials in parts by weight: 100 parts petroleum asphalt, 8 parts bias tire rubber powder, 4 parts linear SBS, 3 parts powdered styrene-butadiene rubber, 1 part furfural extract oil, 0.5 parts zinc dibenzyl dithiocarbamate, 4 parts C9 petroleum resin, and 3 parts aromatic oil.

[0210] The preparation method of high-elasticity and high-toughness SBS modified asphalt concrete specifically includes the following steps:

[0211] Step 1: Prepare the raw materials;

[0212] Step 2: Place the medium-grained diabase aggregate and limestone powder into an oven and heat at 190℃ with forced air for 4 hours to ensure that the medium-grained diabase aggregate is dry and clean, and the limestone powder is dried to a moisture content of less than or equal to 0.5%.

[0213] Step 3: Pour the heated medium-grained diabase and limestone powder into the mixing pot and dry mix at 170°C for 1 minute to ensure uniform aggregate temperature.

[0214] Step 4: Modified asphalt mixing: Heat the modified asphalt to 170℃, pour it into the mixing pot, and wet mix at 170℃ for 2 minutes until the aggregate is completely coated with asphalt and there are no white specks, forming a mixture;

[0215] Step 5: Compaction: The mixture is compacted on-site using a double-drum vibratory roller at a temperature of 160℃. It is first statically compacted twice, then vibrated four times, and then cooled to room temperature.

[0216] It should be noted that the method for preparing modified asphalt in step four includes the following steps:

[0217] S1: Preheating of asphalt and mixing of furfural extract oil: Heat petroleum asphalt to 140°C, add furfural extract oil, stir at low speed (500 rad / min) for 5 min, so that the petroleum asphalt is fully swollen to obtain an asphalt mixture.

[0218] S2: SBS swelling and preliminary shearing: The asphalt mixture prepared in S1 is heated to 185°C, linear SBS is added, followed by aromatic oil. The mixture is stirred at a medium speed of 2000 rad / min for 30 min until the SBS is completely swollen and free of particles, thus obtaining a mixture of asphalt and SBS.

[0219] S3: Addition of zinc dibenzyl dithiocarbamate and high-speed shearing: Add a small amount of zinc dibenzyl dithiocarbamate to the mixture of asphalt and SBS prepared in S2, and perform high-speed shearing at a shearing speed of 4000 rad / min for 10 min, with the temperature controlled at 185℃, to allow the rubber to undergo initial cross-linking and obtain a cross-linked mixture.

[0220] S4: Rubber compounding and secondary shearing: Cool the crosslinked mixture prepared in S3 to 180±5℃, add powdered styrene-butadiene rubber and bias tire rubber powder, stir for 10 min, add C9 petroleum resin, and then maintain high-speed shearing at a shearing speed of 4000 rad / min for 20 min until the rubber particles are uniformly dispersed.

[0221] S5: Add the remaining zinc dibenzyl dithiocarbamate and crosslinking development: Add the remaining zinc dibenzyl dithiocarbamate from S3 to the mixture prepared in S4, stir at a medium speed of 1500 rad / min for 60 min, and keep the temperature at 180±5℃ to complete the chemical crosslinking of the rubber. Then cool down to 135℃ and keep warm for swelling development for 60 min.

[0222] S6: Development: After development is complete, and after inspection to ensure there are no visible particles, modified asphalt is obtained and should be used within 36 hours.

[0223] Experiment 1

[0224] The modified asphalt binders of Examples 1-9 and Comparative Examples 1-3 were tested according to the following standards: GB / T 4509-2010 Determination of Penetration of Asphalt, GB / T 4507-2014 Determination of Softening Point of Asphalt (Ring and Ball Method), GB / T 4508-2010 Determination of Ductility of Asphalt, SH / T 0740-2003 Segregation Test Method for Polymer-Modified Asphalt, SH / T 0654-1998 Determination of Kinematic Viscosity of Petroleum Asphalt, and T 0662-2011 Test Method for Elastic Recovery of Asphalt. The data are shown in Table 1 below.

[0225] Table 1: Performance Test Data of Modified Asphalt Binder

[0226] Experimental Project Elastic recovery rate at 25℃ (%) Ductility at 5℃ (cm) 25℃ penetration Viscosity at 135℃ (mPa・s) Storage stability (softening point difference, °C) Example 1 93 32 48 4200 1.8 Example 2 92 35 45 5800 1.6 Example 3 95 34 46 5000 1.7 Example 4 86 11 50 3800 2.1 Example 5 88 13 47 5200 2.0 Example 6 87 12 48 4500 2.2 Example 7 85 24 49 4300 1.9 Example 8 86 26 46 5900 1.8 Example 9 85 25 47 5100 1.9 Comparative Example 1 86 18 55 3500 2.5 Comparative Example 2 85 20 53 3700 2.4 Comparative Example 3 45 15 56 2800 3.2 National Standard ≥85 ≥30 40-60 3000-6000 ≤2.5

[0227] As shown in the table above, Examples 1-3, employing a ternary composite system of linear SBS, powdered styrene-butadiene rubber, and bias-ply rubber powder, combined with aromatic oil plasticizer and sulfur powder crosslinking, all met the high elasticity and toughness targets (elongation at 5℃ ≥ 32cm, elastic recovery rate at 25℃ ≥ 86%). In contrast, the binary systems of Comparative Example 1 (lacking powdered styrene-butadiene rubber) and Comparative Example 2 (lacking bias-ply rubber powder) only achieved an elastic recovery rate of 85%-86% and a low-temperature elongation of 18-20cm, far below the target. This demonstrates that the synergistic filling and complementary effects of the ternary rubbers are the core to overcoming the bottleneck of elasticity and toughness. Specifically, sulfur first forms a CS-bonded prepolymer with asphalt aromatics, then simultaneously connects the SBS skeleton, bias-ply rubber powder as the rebound node, and powdered styrene-butadiene rubber as the interstitial unit, constructing a three-dimensional interpenetrating network with "SBS as the skeleton, bias-ply rubber powder as the rebound core, and powdered styrene-butadiene rubber as the dense filler." This study solved the problems of numerous voids and insufficient elasticity in a single SBS network, and also compensated for the defects of poor dispersibility and weak interfacial bonding between bias-ply rubber powder and asphalt. Furthermore, Examples 1-3 (aromatic oil and sulfur powder) showed significant performance advantages over Examples 4-6 (paraffin oil and sulfur powder) and Examples 7-9 (aromatic oil and diisopropylbenzene peroxide). Paraffin oil had poor compatibility with ternary rubber, resulting in a sharp drop in low-temperature ductility to 11-13 cm; diisopropylbenzene peroxide had insufficient crosslinking efficiency, with an elastic recovery rate of only 85%-86%, both of which failed to meet the standards. Therefore, it can be concluded that aromatic oil and sulfur powder are the optimal additive combination for this system. Finally, Comparative Example 3, which lacked sulfur powder, had an elastic recovery rate of only 45% and exceeded the storage stability standard (softening point difference of 3.2℃). This indicates that sulfur powder can quickly trigger the formation of a stable CS bond network in the ternary rubber molecular chains, which is the decisive factor in achieving high elasticity and toughness and storage stability.

[0228] Experiment 2

[0229] Referring to standards T 0715-2011 Low-Temperature Bending Test Method for Asphalt Mixtures, T 0719-2011 Rutting Test Method for Asphalt Mixtures, and T 0729-2011 Freeze-Thaw Splitting Test Method for Asphalt Mixtures, the asphalt concrete mixtures of Examples 1-9 and Comparative Examples 1-3 were tested, and the data are shown in Table 2 below:

[0230] Experimental Project -10℃ low-temperature bending failure strain (με) Dynamic stability at 60℃ (cycles / mm) Freeze-thaw splitting strength ratio (%) Porosity (%) Example 1 3200 7000 82 3.8 Example 2 3300 7500 83 4.2 Example 3 3150 7300 82 4.0 Example 4 2300 5000 72 3.9 Example 5 2400 5200 73 4.0 Example 6 2500 4800 78 4.1 Example 7 2300 5800 76 3.8 Example 8 2750 6000 79 4.2 Example 9 2700 5950 80 4.0 Comparative Example 1 1900 3800 70 3.8 Comparative Example 2 2000 3200 71 3.9 Comparative Example 3 1950 3500 62 4.1 National Standard ≥3000 ≥5000 ≥80 3-5

[0231] As shown in the table above, the initial goal of this solution was only to improve the high elasticity and toughness of the mixture, but it unexpectedly achieved a synergistic improvement in both high elasticity and toughness and rutting resistance. The dynamic stability at 60℃ of Examples 1-3 reached 7200-7500 cycles / mm, which not only far exceeded the standard of ≥5000 cycles / mm for conventional modified asphalt, but also improved compared to the binary rubber system (Comparative Examples 1-2, 3800-4000 cycles / mm) and the dicumyl peroxide crosslinking system (Examples 7-9, 5800-6000 cycles / mm). In traditional technology, dynamic stability exceeding 7000 cycles / mm requires the addition of rigid fillers, which inevitably leads to a drop in low-temperature bending strain to below 2500με. However, this solution achieves "bending strain greater than or equal to 3100με at -10℃ (high elasticity and toughness) and dynamic stability greater than or equal to 7200 cycles / mm at 60℃ (high rutting resistance)" simply through ternary rubber synergistic crosslinking, breaking the industry prejudice that "elasticity and rutting resistance cannot be achieved simultaneously".

[0232] This effect stems from the precise matching of the ternary rubber system with the optimal additives. The bias-ply rubber powder acts as an elastic rebound node, providing anti-slip support at high temperatures. Powdered styrene-butadiene rubber fills the network gaps, improving the system's density. The dense CS bond network constructed by sulfur powder not only enhances low-temperature elastic recovery but also inhibits high-temperature molecular chain slippage. The three work together to form a stable structure, achieving dual advantages without additional optimization. In contrast, the absence of any core component in Comparative Examples 1-3 not only reduces high elasticity and toughness but also significantly reduces rutting resistance, proving that the unique advantages of the synergistic system of "ternary rubber, aromatic oil, and sulfur powder" in this solution cannot be achieved through a single component or conventional combination.

[0233] The foregoing has shown and described the basic principles and main features of the present invention and its advantages. It will be apparent to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-limiting in all respects. The scope of the present invention is defined by the appended claims rather than the foregoing description. Therefore, it is intended that all changes falling within the meaning and scope of the equivalents of the claims be included within the present invention, and no reference numerals in the claims should be regarded as limiting the scope of the claims.

[0234] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A high-elasticity, high-toughness SBS-modified asphalt concrete, characterized in that, The raw materials include the following parts by weight: 100 parts of medium-grained diabase aggregate, 25-40 parts of modified bitumen and limestone mineral powder; The modified asphalt comprises the following raw materials in parts by weight: 100 parts base asphalt, 8-12 parts rubber powder, 4-6 parts SBS, 3-5 parts styrene-butadiene rubber, 1-2 parts furfural extract oil, 0.5-1 parts zinc dibenzyl dithiocarbamate, 4-6 parts C9 petroleum resin, 3-5 parts plasticizer, and 1-1.5 parts crosslinking agent.

2. The high-elasticity and high-toughness SBS modified asphalt concrete according to claim 1, characterized in that, The base asphalt is selected from petroleum asphalt.

3. The high-elasticity and high-toughness SBS modified asphalt concrete according to claim 1, characterized in that, The rubber powder used is 40-80 mesh bias tire rubber powder.

4. The high-elasticity and high-toughness SBS modified asphalt concrete according to claim 1, characterized in that, The SBS is a linear or star-shaped styrene-butadiene-styrene block copolymer.

5. The high-elasticity and high-toughness SBS modified asphalt concrete according to claim 1, characterized in that, The styrene-butadiene rubber used is powdered styrene-butadiene rubber with a mesh size of 40 or higher.

6. The high-elasticity and high-toughness SBS modified asphalt concrete according to claim 1, characterized in that, The crosslinking agent is selected from either sulfur powder or dicumyl peroxide.

7. The high-elasticity and high-toughness SBS modified asphalt concrete according to claim 1, characterized in that, The plasticizer is selected from either aromatic oil or paraffin oil.

8. A method for preparing high-elasticity and high-toughness SBS modified asphalt concrete as described in any one of claims 1-6, characterized in that, The method includes the following steps: Step 1: Prepare the raw materials; Step 2: Place the medium-grained diabase aggregate and limestone powder into an oven and heat at 190-205℃ for 4-8 hours to ensure that the medium-grained diabase aggregate is dry and clean, and the limestone powder is dried to a moisture content of less than or equal to 0.5%. Step 3: Pour the heated medium-grained diabase and limestone powder into the mixing pot and dry mix at 170-180℃ for 1-2 minutes to make the aggregate temperature uniform; Step 4: Modified asphalt mixing: Heat the modified asphalt to 170-180℃, pour it into the mixing pot, and wet mix at 170-180℃ for 2-3 minutes until the aggregate is completely coated with asphalt and there are no white specks, forming a mixture; Step 5: Compaction: The mixture is compacted on-site using a double-drum vibratory roller at a temperature of 160-170℃. First, it is statically compacted twice, then vibratory compacted four to six times, and then cooled to room temperature.

9. The method for preparing high-elasticity and high-toughness SBS modified asphalt concrete according to claim 8, characterized in that, The method for preparing modified asphalt in step four includes the following steps: S1: Preheating of asphalt and mixing of furfural extract oil: Heat the base asphalt to 140-190℃, add furfural extract oil, stir at low speed (500-800 rad / min) for 5-30 min, so that the base asphalt is fully swollen to obtain an asphalt mixture. S2: SBS swelling and preliminary shearing: Heat the asphalt mixture prepared in S1 to 185-200℃, add SBS, then add plasticizer, stir at medium speed (2000-3000 rad / min) for 30-120 min until SBS is completely swollen and free of particles, to obtain a mixture of asphalt and SBS. S3: Addition of zinc dibenzyl dithiocarbamate and high-speed shearing: Add a small amount of zinc dibenzyl dithiocarbamate to the mixture of asphalt and SBS prepared in S2, and perform high-speed shearing at a shearing speed of 4000-5000 rad / min for 10-60 min, with the temperature controlled at 185-195℃, to allow the rubber to initially crosslink and obtain a crosslinked mixture; S4: Double rubber compounding and secondary shearing: Cool the crosslinked mixture prepared in S3 to 180±5℃, add styrene-butadiene rubber and rubber powder, stir for 10-30 min, add C9 petroleum resin, and then maintain high-speed shearing, with a shearing speed of 4000-5000 rad / min and a shearing time of 20-40 min, until the rubber particles are uniformly dispersed. S5: Add the remaining zinc dibenzyl dithiocarbamate and crosslinking agent from S3 to the mixture prepared in S4. Stir at a medium speed of 1500-2000 rad / min for 60-150 min, and keep the temperature at 180±5℃ to complete the chemical crosslinking of the rubber. Then cool down to 135-145℃ and keep warm for swelling and development for 60-90 min. S6: Development: After development is complete, and after inspection to ensure there are no visible particles, modified asphalt is obtained and should be used within 36 hours.