Construction method of composite modified asphalt based on tire rubber SBS (Styrene Butadiene Styrene)

Abstract

The invention belongs to the technical field of modified asphalt preparation and construction methods, and particularly relates to a construction method of SBS composite modified asphalt based on tire rubber. The construction method based on the tire rubber SBS composite modified asphalt comprises the following steps: S1, mixing matrix asphalt, regenerated desulfurized tire rubber powder, an SBS material and a compound emulsifier to prepare the tire rubber SBS composite modified asphalt; s2, gravel, mineral powder and slaked lime are mixed to form a pretreatment material, then the tire rubber SBS composite modified asphalt is added, stirring is conducted, and an asphalt stabilized gravel finished material is obtained; and S3, paving the asphalt stabilized macadam finished material, and compacting the paved asphalt stabilized macadam finished material by adopting a road roller. According to the invention, the storage stability and low-temperature bending failure strain of the asphalt are effectively improved, and construction based on the tire rubber SBS composite modified asphalt is realized.

Description

Technical Field

[0001] The invention belongs to the technical field of modified asphalt preparation and construction methods, and particularly relates to a construction method based on tire rubber SBS composite modified asphalt. Background Art

[0002] With the increase in traffic volume and heavy-loaded vehicles, asphalt pavements are generally experiencing problems such as aging, cracking, rutting, and reduced anti-skid performance (polishing, insufficient structural depth), which affect driving safety and comfort and shorten the service life of roads. Traditional micro-surfacing technology has the following problems: (1) The residual performance of the emulsified asphalt used for micro-surfacing is poor, with a low softening point and low viscosity, resulting in insufficient durability; (2) Coarse aggregate is easily exposed on the surface, resulting in high noise; (3) The emulsified asphalt standard is low, the production threshold is lowered, and the low cost makes it easy to cut corners and difficult to ensure quality; (4) The overall oil-to-stone ratio is low, which is related to insufficient durability and high noise. Cold-laid asphalt mixture is a skeleton-porous asphalt mixture with a large surface structural depth, outstanding anti-skid effect, large internal voids, and good sound absorption and noise reduction effect; the mixture is mixed at low temperature, and the degree of asphalt aging is reduced by more than 80% compared with hot-mix asphalt mixture, which significantly improves the early strength, high temperature stability, low temperature crack resistance, water stability, and especially fatigue durability of the mixture.

[0003] A Chinese patent (publication number CN101967048B) discloses a rubber-modified asphalt mixture and its preparation and construction methods. By adding TOR to the asphalt mixture, this invention addresses the problem of thick and sticky mixtures during construction. Furthermore, it reduces the mixing temperature of the rubber-modified asphalt mixture, reduces processing equipment, and improves the production process. The continuous dense gradation design helps prevent water damage, and the preparation process enhances the performance of the rubber-modified asphalt mixture. This invention uses waste rubber powder to modify asphalt for asphalt pavement construction. This not only promotes the comprehensive utilization of waste tires, reduces the significant environmental pressure caused by "black pollution," and conserves resources, but also improves the road performance of the asphalt mixture, enhancing the pavement's quality and extending its service life. This reduces costs while improving product performance. Compared to existing rubber-modified asphalt production processes, this invention is more energy-efficient, environmentally friendly, and convenient for construction. However, this technology does not process the waste tire rubber powder, resulting in insufficient storage stability and low-temperature flexural failure strain of the resulting asphalt, hindering practical construction.

[0004] Therefore, how to desulfurize and regenerate tire rubber powder and combine it with appropriate SBS materials and emulsifiers to achieve a construction method based on tire rubber SBS composite modified asphalt has become a direction that needs to be studied. Summary of the Invention

[0005] In view of the shortcomings of the existing technology, the purpose of the present invention is to provide a construction method based on tire rubber SBS composite modified asphalt; the present invention regenerates and desulfurizes waste tire rubber powder, first desulfurizes the waste tire rubber powder using dithiothreitol, and then performs aerobic regeneration treatment in a tubular furnace to prepare regenerated desulfurized tire rubber powder, which is then combined with matrix asphalt, SBS material and a compound emulsifier to obtain tire rubber SBS composite modified asphalt, and the composite modified asphalt is mixed with pretreated material to obtain asphalt-stabilized crushed stone material, and finally paved and compacted to achieve construction based on tire rubber SBS composite modified asphalt.

[0006] The first aspect of the present invention provides a construction method based on tire rubber SBS composite modified asphalt, comprising the following steps: S1: Mixing base asphalt, regenerated desulfurized tire rubber powder, SBS material and compound emulsifier to prepare tire rubber SBS composite modified asphalt; S2: crushed stone, mineral powder and slaked lime are mixed to form a pre-treated material, and then tire rubber SBS composite modified asphalt is added and stirred to obtain asphalt-stabilized crushed stone material; S3: The asphalt-stabilized crushed stone material is laid, and the asphalt-stabilized crushed stone material is compacted by a roller.

[0007] As a preferred technical solution of the present invention, the preparation step of the tire rubber SBS composite modified asphalt in step S1 includes: first mixing 70-80 parts of base asphalt, 16-20 parts of regenerated desulfurized tire rubber powder and 1.2-1.6 parts of SBS material, stirring, then transferring to a colloid mill, and then adding 0.8-1.2 parts of a compound emulsifier for grinding to obtain the tire rubber SBS composite modified asphalt.

[0008] As a preferred technical solution of the present invention, the weight proportions of the matrix asphalt in the present invention can be 70 parts, 72 parts, 74 parts, 76 parts, 78 parts or 80 parts, etc.

[0009] As a preferred technical solution of the present invention, the weight proportion of the regenerated desulfurized tire rubber powder in the present invention can be 16 parts, 17 parts, 18 parts, 19 parts or 20 parts.

[0010] As a preferred technical solution of the present invention, the weight proportion of the SBS material in the present invention can be 1.2 parts, 1.3 parts, 1.4 parts, 1.5 parts or 1.6 parts.

[0011] As a preferred technical solution of the present invention, the weight proportion of the compound emulsifier in the present invention can be 0.8 parts, 0.9 parts, 1.0 parts, 1.1 parts or 1.2 parts, etc.

[0012] As a preferred technical solution of the present invention, the preparation step of the pretreated material in step S2 includes: mixing 90 to 100 parts of crushed stone, 2 to 6 parts of mineral powder, and 2 to 4 parts of slaked lime, stirring for 10 to 20 seconds, and then heating to 50 to 60°C to form the pretreated material.

[0013] As a preferred technical solution of the present invention, the preparation step of the asphalt-stabilized gravel material in step S2 includes: adding 20 to 30 parts by weight of tire rubber SBS composite modified asphalt to 100 to 120 parts of pretreated material, stirring evenly at 50 to 60° C. to obtain the asphalt-stabilized gravel material.

[0014] As a preferred technical solution of the present invention, the preparation method of regenerated desulfurized tire rubber powder includes: first using dithiothreitol to desulfurize waste tire rubber powder to obtain desulfurized tire rubber powder; then aerobically regenerating the desulfurized tire rubber powder to obtain regenerated desulfurized tire rubber powder.

[0015] As a preferred technical solution of the present invention, the desulfurization treatment step includes: adding 20 to 30 parts of waste tire rubber powder to 200 to 300 parts of xylene, adding 2 to 4 parts of dithiothreitol, and desulfurizing at 110 to 120° C. for 8 to 10 hours, washing with anhydrous methanol, and drying to obtain desulfurized tire rubber powder.

[0016] During the desulfurization treatment process of the present invention, dithiothreitol is used as a desulfurizing agent to effectively achieve "targeted" cleavage of rubber cross-links, that is, during the regeneration process of vulcanized natural rubber, only the cross-links of the rubber are destroyed without destroying the main chain structure of the rubber. After entering the cross-linked network, dithiothreitol selectively attacks the cross-links through thiol groups to cause them to break and generate thiol groups, while the dithiothreitol itself is oxidized to form a six-membered ring containing disulfide bonds, thereby achieving targeted desulfurization of the vulcanized natural rubber.

[0017] As a preferred technical solution of the present invention, the aerobic regeneration treatment step includes: adding desulfurized tire rubber powder into a tubular furnace, controlling the temperature to 240-260°C, the air gas flow rate to 16-20 mL / min, and the treatment time to 10-20 min.

[0018] During the aerobic regeneration process of the present invention, oxygen first diffuses through the pores of the rubber powder and is adsorbed on the surface, then contacts the sulfur cross-links or rubber molecular chains remaining after the desulfurization treatment. Through the synergistic effect of high temperature and oxygen, the sulfur cross-links remaining in the rubber are selectively broken and part of the rubber molecular chains are oxidatively degraded, thereby achieving the depolymerization of the rubber network structure, thereby obtaining regenerated desulfurized tire rubber powder.

[0019] As a preferred technical solution of the present invention, the preparation method of the modified SBS material includes: firstly performing epoxidation treatment on the SBS material to obtain an epoxidized SBS material; then mixing the epoxidized SBS material with amino-treated graphene to perform modification treatment to obtain the modified SBS material.

[0020] As a preferred technical solution of the present invention, the epoxidation treatment step includes: adding 10 to 12 parts of SBS material to 90 to 100 parts of cyclohexane, stirring at a temperature of 40 to 50° C. for 50 to 60 minutes, then adding 1.2 to 1.6 parts of formic acid and 0.6 to 0.8 parts of polyethylene glycol, reacting at 70 to 80° C. for 140 to 160 minutes, cooling to room temperature, washing with anhydrous ethanol, and drying to obtain an epoxidized SBS material.

[0021] As a preferred technical solution of the present invention, the modification step includes: adding 6 to 8 parts of epoxidized SBS material to 90 to 100 parts of cyclohexane, stirring at a temperature of 60 to 70° C. for 50 to 60 minutes, then adding 2 to 4 parts of a 0.2 to 0.3 mol / L sodium hydroxide aqueous solution and 1 to 3 parts of amino-treated graphene, stirring and modifying at 70 to 80° C. for 200 to 240 minutes, washing with anhydrous ethanol, and drying to obtain a modified SBS material.

[0022] The present invention first uses formic acid and polyethylene glycol to partially epoxidize the double bonds of polybutadiene in the SBS material to form an epoxidized SBS material. Then, the epoxy groups of the SBS material are chemically bonded with the surface groups of the amination-treated graphene nanoparticles to achieve a ring-opening graft crosslinking reaction between the epoxy groups and the amino groups, thereby obtaining a modified SBS material with an organic-inorganic hybrid crosslinking structure.

[0023] As a preferred technical solution of the present invention, the compound emulsifier is Evonik's imidazoline emulsifier VARISOFT 3690 and Xuejie Chemical's cationic emulsifier 1831; the mass ratio of Evonik's imidazoline emulsifier VARISOFT 3690 and Xuejie Chemical's cationic emulsifier 1831 in the emulsifier is (1~2):1.

[0024] As a preferred technical solution of the present invention, the pH of the imidazoline emulsifier VARISOFT 3690 produced by Evonik is 6.5-8.0 and the active matter content is 88%.

[0025] As a preferred technical solution of the present invention, the pH of the cationic emulsifier 1831 produced by Xuejie Chemical is 6.0-8.0, and the active matter content is 70%.

[0026] The present invention uses Evonik's imidazoline emulsifier VARISOFT 3690 and Xuejie Chemical's cationic emulsifier 1831 for compounding. The cationic emulsifier 1831 provides a strong cationic charge, while the imidazoline structure of VARISOFT 3690 can have a more flexible charge distribution. The combination of the two can balance the charge density of the emulsion particles and reduce agglomeration caused by insufficient charge repulsion. At the same time, the imidazoline molecules have large hydrophobic chains and cyclic structures, which can enhance the mechanical strength of the asphalt-water interface film, while the linear alkyl chain of the cationic emulsifier 1831 can fill the molecular gaps to form a tighter interface layer, delaying particle aggregation. The combination of the two improves the storage stability of asphalt.

[0027] Compared with the prior art, the present invention has the following beneficial effects: (1) The regenerated desulfurized tire rubber powder of the present invention breaks the sulfur cross-linking bonds of the rubber, reduces the cross-linking density, and makes the rubber powder more evenly dispersed in the asphalt, avoiding the formation of aggregation or precipitation, and effectively improving the storage stability; at the same time, the aerobic regeneration treatment can increase the surface active points, form stronger physical entanglement and chemical bonding with the asphalt, obtain a more stable three-dimensional network structure, and thus increase the low-temperature bending failure strain.

[0028] (2) The modified SBS material of the present invention can be dispersed more evenly in asphalt due to the nanometer size and high specific surface area of ​​graphene, thereby reducing aggregation and forming an organic-inorganic interpenetrating network system with good compatibility during the SBS swelling process, thereby reducing the occurrence of segregation and significantly improving the storage stability of asphalt. In addition, the two-dimensional layer structure of amino-modified graphene can effectively hinder the slippage of asphalt molecular chains, thereby improving the mechanical properties of asphalt as a reinforcing material.

[0029] (3) The present invention uses Evonik's imidazoline emulsifier VARISOFT 3690 and Xuejie Chemical's cationic emulsifier 1831 for compounding. The cationic emulsifier 1831 provides a strong cationic charge, while the imidazoline structure of VARISOFT 3690 can have a more flexible charge distribution. The combination of the two can balance the charge density of the emulsion particles and reduce the aggregation caused by insufficient charge repulsion. At the same time, the imidazoline molecules have a large hydrophobic chain and a ring structure, which can enhance the mechanical strength of the asphalt-water interface film, while the linear alkyl chain of the cationic emulsifier 1831 can fill the molecular gaps to form a tighter interface layer, delaying the aggregation of particles. The combination of the two improves the storage stability of asphalt. DETAILED DESCRIPTION

[0030] For the convenience of understanding the present invention, the present invention is given below with examples. It should be understood by those skilled in the art that the examples are only for the purpose of helping to understand the present invention and should not be regarded as specific limitations of the present invention.

[0031] The sources of some components in the Examples and Comparative Examples are as follows: Crushed stone, basalt crushed stone with a particle size of 5 mm, was purchased from Jiangsu Yabang Mining Co., Ltd.; Mineral powder, model P800, was purchased from Jinan Luxin New Building Materials Co., Ltd.; Scrap tire rubber powder, commercially available; Dithiothreitol, CAS No. 3483-12-3, was purchased from Shanghai MacLean Biochemical Technology Co., Ltd.; SBS material, brand YH-792E, purchased from Baling Petrochemical; Polyethylene glycol, product number P103737, was purchased from Shanghai Aladdin Biochemical Technology Co., Ltd.; Aminated graphene, product number G293467, diameter 100-200 nm, purchased from Shanghai Aladdin Biochemical Technology Co., Ltd. imidazoline emulsifier VARISOFT 3690, pH 6.5-8.0, active matter 87%, purchased from Evonik; Cationic emulsifier 1831, pH 6.0-8.0, active matter content 70%, was purchased from Shanghai Xuejie Chemical Co., Ltd.

[0032] Example 1 This embodiment provides a construction method based on tire rubber SBS composite modified asphalt, comprising the following steps: S1: By weight, 80 parts of base asphalt, 20 parts of recycled desulfurized tire rubber powder, and 1.6 parts of modified SBS material were mixed and stirred, then transferred to a colloid mill. 1.2 parts of a compound emulsifier (0.8 parts of Evonik's imidazoline emulsifier VARISOFT 3690 and 0.4 parts of Xuejie Chemical's cationic emulsifier 1831) were added and ground to obtain a tire rubber SBS composite modified asphalt. S2: 100 parts of crushed stone, 6 parts of mineral powder, and 4 parts of slaked lime were mixed and stirred for 20 seconds, then heated to 60°C to form a pretreated material. 30 parts of tire rubber SBS composite modified asphalt were added to 120 parts of the pretreated material and stirred evenly at 60°C to obtain asphalt-stabilized crushed stone material. S3: The asphalt-stabilized crushed stone material is laid, and the asphalt-stabilized crushed stone material is compacted by a roller.

[0033] The preparation of the regenerated desulfurized tire rubber powder comprises the following steps: adding 30 parts by weight of waste tire rubber powder to 300 parts of xylene, then adding 4 parts of dithiothreitol, and desulfurizing the mixture at 120° C. for 8 hours, washing with anhydrous methanol, and drying to obtain desulfurized tire rubber powder; adding the desulfurized tire rubber powder to a tubular furnace, controlling the temperature at 260° C., the air flow rate at 20 mL / min, and the treatment time at 20 minutes to obtain the regenerated desulfurized tire rubber powder.

[0034] The modified SBS material is prepared by adding 12 parts of SBS material to 100 parts of cyclohexane, stirring at 50° C. for 50 minutes, then adding 1.6 parts of formic acid and 0.8 parts of polyethylene glycol, reacting at 80° C. for 140 minutes, cooling to room temperature, washing with anhydrous ethanol, and drying to obtain an epoxidized SBS material; and adding 8 parts of epoxidized SBS material to 100 parts of cyclohexane, stirring at 70° C. for 50 minutes, then adding 4 parts of a 0.3 mol / L sodium hydroxide aqueous solution and 3 parts of amino-treated graphene, stirring at 70° C. for 240 minutes, washing with anhydrous ethanol, and drying to obtain the modified SBS material.

[0035] Example 2 This embodiment provides a construction method based on tire rubber SBS composite modified asphalt, comprising the following steps: S1: By weight, 70 parts of base asphalt, 16 parts of recycled desulfurized tire rubber powder, and 1.2 parts of modified SBS material were mixed and stirred, then transferred to a colloid mill. 0.8 parts of a compound emulsifier (0.4 parts of Evonik's imidazoline emulsifier VARISOFT 3690 and 0.4 parts of Xuejie Chemical's cationic emulsifier 1831) were added and ground to obtain a tire rubber SBS composite modified asphalt. S2: 95 parts of crushed stone, 4 parts of mineral powder, and 3 parts of slaked lime were mixed and stirred for 10 seconds, then heated to 50°C to form a pretreated material. 20 parts of tire rubber SBS composite modified asphalt were added to 100 parts of the pretreated material and stirred evenly at 50°C to obtain asphalt-stabilized crushed stone material; S3: The asphalt-stabilized crushed stone material is laid, and the asphalt-stabilized crushed stone material is compacted by a roller.

[0036] The preparation of the regenerated desulfurized tire rubber powder comprises the following steps: adding 20 parts by weight of waste tire rubber powder to 200 parts of xylene, adding 2 parts of dithiothreitol, and desulfurizing the mixture at 110° C. for 10 hours, washing with anhydrous methanol, and drying to obtain desulfurized tire rubber powder; adding the desulfurized tire rubber powder to a tubular furnace, controlling the temperature at 240° C., the air flow rate at 16 mL / min, and the treatment time at 10 minutes to obtain the regenerated desulfurized tire rubber powder.

[0037] The modified SBS material is prepared as follows: 10 parts by weight of SBS material are added to 90 parts of cyclohexane, stirred at 40° C. for 60 minutes, then 1.2 parts of formic acid and 0.6 parts of polyethylene glycol are added, reacted at 70° C. for 160 minutes, cooled to room temperature, washed with anhydrous ethanol, and dried to obtain an epoxidized SBS material; 6 parts of epoxidized SBS material are added to 90 parts of cyclohexane, stirred at 60° C. for 60 minutes, then 2 parts of 0.3 mol / L sodium hydroxide aqueous solution and 1 part of amino-treated graphene are added, stirred at 70° C. for 240 minutes for modification, washed with anhydrous ethanol, and dried to obtain the modified SBS material.

[0038] Example 3 This embodiment provides a construction method based on tire rubber SBS composite modified asphalt, comprising the following steps: S1: By weight, 75 parts of base asphalt, 18 parts of recycled desulfurized tire rubber powder, and 1.4 parts of modified SBS material were mixed and stirred, then transferred to a colloid mill. 1.0 part of a composite emulsifier (0.6 parts of Evonik's imidazoline emulsifier VARISOFT 3690 and 0.4 parts of Xuejie Chemical's cationic emulsifier 1831) was added and ground to obtain a tire rubber SBS composite modified asphalt. S2: 95 parts of crushed stone, 4 parts of mineral powder, and 3 parts of slaked lime were mixed and stirred for 15 seconds, then heated to 55°C to form a pretreated material. 25 parts of tire rubber SBS composite modified asphalt were added to 110 parts of the pretreated material and stirred evenly at 55°C to obtain asphalt-stabilized crushed stone material. S3: The asphalt-stabilized crushed stone material is laid, and the asphalt-stabilized crushed stone material is compacted by a roller.

[0039] The preparation of the regenerated desulfurized tire rubber powder comprises the following steps: adding 25 parts of waste tire rubber powder to 250 parts of xylene, adding 3 parts of dithiothreitol, and desulfurizing the mixture at 115° C. for 9 hours, washing the mixture with anhydrous methanol, and drying the mixture to obtain desulfurized tire rubber powder; adding the desulfurized tire rubber powder to a tubular furnace, controlling the temperature at 250° C., the air flow rate at 18 mL / min, and the treatment time at 15 minutes to obtain the regenerated desulfurized tire rubber powder.

[0040] The modified SBS material is prepared as follows: 11 parts by weight of SBS material are added to 95 parts of cyclohexane, stirred at 45° C. for 55 minutes, then 1.4 parts of formic acid and 0.7 parts of polyethylene glycol are added, reacted at 75° C. for 150 minutes, cooled to room temperature, washed with anhydrous ethanol, and dried to obtain an epoxidized SBS material; 7 parts of epoxidized SBS material are added to 95 parts of cyclohexane, stirred at 65° C. for 55 minutes, then 3 parts of a 0.2 mol / L sodium hydroxide aqueous solution and 2 parts of amino-treated graphene are added, modified at 75° C. for 220 minutes, washed with anhydrous ethanol, and dried to obtain the modified SBS material.

[0041] Comparative Example 1 The difference between this comparative example and Example 1 is that waste tire rubber powder is used instead of recycled desulfurized tire rubber powder.

[0042] Comparative Example 2 The difference between this comparative example and Example 1 is that SBS material (brand: YH-792E) is used to replace the modified SBS material.

[0043] Comparative Example 3 The difference between this comparative example and Example 1 is that the imidazoline emulsifier VARISOFT 3690 is used to replace the compound emulsifier.

[0044] Comparative Example 4 The difference between this comparative example and Example 1 is that cationic emulsifier 1831 is used instead of the compound emulsifier.

[0045] Comparative Example 5 The difference between this comparative example and Example 1 is that no desulfurization treatment is performed during the preparation of the regenerated desulfurized tire rubber powder.

[0046] Comparative Example 6 The difference between this comparative example and Example 1 is that no aerobic regeneration treatment is performed during the preparation of the regenerated desulfurized tire rubber powder.

[0047] The performance test was carried out in accordance with the requirements of the Test Procedure for Asphalt and Asphalt Mixtures in Highway Engineering (JTG E20-2011).

[0048] The performance test data is shown in Table 1.

[0049] Table 1 Performance test results Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 Comparative Example 6 Residue on sieve (1.18 sieve) 0.06 0.05 0.07 0.08 0.09 0.05 0.06 0.07 0.08 Ngualla viscosity 18 16 19 17 18 21 20 18 19 Standard viscosity of asphalt (s) 35 32 37 36 33 38 35 36 34 Evaporation residue content (%) 62.4 61.9 62.2 62.7 62.1 61.8 6.23 62.6 62.2 5d storage stability (%) 3.51 3.45 3.48 5.26 5.07 4.39 4.31 4.15 3.83 Needle penetration at 25°C (100g, 5s, 0.1mm) 52 51 53 54 51 52 50 54 52 Retained ductility (5℃, cm) 35 33 36 32 34 36 35 33 34 Softening point (ring and ball method, °C) 78 76 79 77 79 76 78 76 75 Dynamic viscosity (60℃, Pa.s) 20900 20750 20830 20714 20826 20785 20843 20761 20803 Low temperature bending failure strain 3640 3615 3628 3211 3224 3589 3597 3481 3438 As can be seen from the above content, the present invention regenerates and desulfurizes waste tire rubber powder, first desulfurizes the waste tire rubber powder using dithiothreitol, and then performs aerobic regeneration treatment in a tubular furnace to prepare regenerated desulfurized tire rubber powder. The regenerated desulfurized tire rubber powder is used together with a matrix asphalt, a modified SBS material, an imidazoline emulsifier VARISOFT 3690, and a cationic emulsifier 1831 to obtain a tire rubber SBS composite modified asphalt, which effectively improves the storage stability and low-temperature bending failure strain of the asphalt and realizes construction based on the tire rubber SBS composite modified asphalt.

[0050] Compared with Example 1, the use of waste tire rubber powder instead of recycled desulfurized tire rubber powder resulted in poorer storage stability and a lower low-temperature flexural failure strain (Comparative Example 1). Compared with Example 1, the use of SBS material (brand YH-792E) instead of modified SBS material resulted in poorer storage stability and a lower low-temperature flexural failure strain (Comparative Example 2). Compared with Example 1, the use of imidazoline emulsifier VARISOFT 3690 instead of the compound emulsifier resulted in poorer storage stability due to the lack of the compounding effect of the two emulsifiers (Comparative Example 3). Compared with Example 1, the use of cationic emulsifier 1831 instead of the compound emulsifier resulted in poorer storage stability due to the lack of the compounding effect of the two emulsifiers (Comparative Example 4). Compared with Example 1, the use of no desulfurization treatment during the preparation of the recycled desulfurized tire rubber powder resulted in poorer storage stability and a lower low-temperature flexural failure strain (Comparative Example 5). Compared with Example 1, the use of no aerobic regeneration treatment during the preparation of the recycled desulfurized tire rubber powder resulted in a lower low-temperature flexural failure strain (Comparative Example 6).

Claims

1. A construction method based on tire rubber SBS composite modified asphalt, characterized in that: include Follow these steps: S1: Mixing base asphalt, regenerated desulfurized tire rubber powder, SBS material and compound emulsifier to prepare tire rubber SBS composite modified asphalt; S2: crushed stone, mineral powder and slaked lime are mixed to form a pre-treated material, and then tire rubber SBS composite modified asphalt is added and stirred to obtain asphalt-stabilized crushed stone material; S3: The asphalt-stabilized crushed stone material is laid, and the asphalt-stabilized crushed stone material is compacted by a roller.

2. The construction method based on tire rubber SBS composite modified asphalt according to claim 1, characterized in that: The preparation step of the tire rubber SBS composite modified asphalt in step S1 includes: first mixing 70-80 parts of base asphalt, 16-20 parts of regenerated desulfurized tire rubber powder and 1.2-1.6 parts of SBS material by weight, stirring, then transferring to a colloid mill, and then adding 0.8-1.2 parts of a compound emulsifier for grinding to obtain the tire rubber SBS composite modified asphalt.

3. The construction method based on tire rubber SBS composite modified asphalt according to claim 1, characterized in that: The preparation method of the regenerated desulfurized tire rubber powder comprises: firstly performing a desulfurization treatment on waste tire rubber powder using dithiothreitol to obtain desulfurized tire rubber powder; and then performing an aerobic regeneration treatment on the desulfurized tire rubber powder to obtain regenerated desulfurized tire rubber powder.

4. The construction method based on tire rubber SBS composite modified asphalt according to claim 3, characterized in that: The desulfurization treatment step includes: adding 20 to 30 parts of waste tire rubber powder to 200 to 300 parts of xylene by weight, then adding 2 to 4 parts of dithiothreitol, desulfurizing at 110 to 120° C. for 8 to 10 hours, washing with anhydrous methanol, and drying to obtain desulfurized tire rubber powder.

5. The construction method based on tire rubber SBS composite modified asphalt according to claim 3, characterized in that: The aerobic regeneration treatment step includes: adding desulfurized tire rubber powder into a tubular furnace, controlling the temperature to 240-260° C., the air gas flow rate to 16-20 mL / min, and the treatment time to 10-20 min.

6. The construction method based on tire rubber SBS composite modified asphalt according to claim 1, characterized in that: The preparation method of the modified SBS material comprises: firstly performing epoxidation treatment on the SBS material to obtain the epoxidized SBS material; and then mixing the epoxidized SBS material with amino-treated graphene to perform modification treatment to obtain the modified SBS material.

7. The construction method based on tire rubber SBS composite modified asphalt according to claim 6, characterized in that: The epoxidation treatment step includes: adding 10 to 12 parts of SBS material to 90 to 100 parts of cyclohexane by weight, stirring at a temperature of 40 to 50° C. for 50 to 60 minutes, then adding 1.2 to 1.6 parts of formic acid and 0.6 to 0.8 parts of polyethylene glycol, reacting at a temperature of 70 to 80° C. for 140 to 160 minutes, cooling to room temperature, washing with anhydrous ethanol, and drying to obtain an epoxidized SBS material.

8. The construction method based on tire rubber SBS composite modified asphalt according to claim 6, characterized in that: The modification treatment step includes: adding 6 to 8 parts of epoxidized SBS material to 90 to 100 parts of cyclohexane, stirring at a temperature of 60 to 70° C. for 50 to 60 minutes, then adding 2 to 4 parts of a 0.2 to 0.3 mol / L sodium hydroxide aqueous solution and 1 to 3 parts of amino-treated graphene, stirring and modifying the material at a temperature of 70 to 80° C. for 200 to 240 minutes, washing with anhydrous ethanol, and drying to obtain a modified SBS material.

9. The construction method based on tire rubber SBS composite modified asphalt according to claim 1, characterized in that: The compound emulsifier is Evonik's imidazoline emulsifier VARISOFT 3690 and Xuejie Chemical's cationic emulsifier 1831; the mass ratio of Evonik's imidazoline emulsifier VARISOFT 3690 and Xuejie Chemical's cationic emulsifier 1831 in the emulsifier is (1~2):

1.

10. The construction method based on tire rubber SBS composite modified asphalt according to claim 9, characterized in that: The pH of Evonik's imidazoline emulsifier VARISOFT 3690 is 6.5-8.0, and the active matter content is 88%; The pH of the cationic emulsifier 1831 produced by Xuejie Chemical is 6.0-8.0, and the active matter content is 70%.