Inner framework supporting asphalt-rich mixture for pavement and preparation method of inner framework supporting asphalt-rich mixture

Abstract

The invention relates to the field of asphalt mixture production, in particular to an inner framework supporting asphalt-rich mixture for pavement and a preparation method thereof, and the asphalt mixture comprises the following components in parts by mass: 60-68 parts of coarse aggregate, 16-23 parts of fine aggregate, 8-14 parts of asphalt, 6-9 parts of mineral powder, 3-5 parts of coked sulfur paste, 0.3-0.7 part of fiber and 0.25-0.75 part of an anti-aging agent; the asphalt mixture provided by the invention realizes resourceful treatment of the coked sulfur paste; the preparation method has the advantage of being easy to operate.

Description

Technical Field

[0001] The present application relates to the field of asphalt mixture production, and more specifically, to an internal skeleton-supported asphalt-rich mixture for pavement and a preparation method thereof. Background Art

[0002] Asphalt mixture is a composite material composed of asphalt, coarse aggregate, fine aggregate, and mineral powder in specific proportions. It's primarily used in pavement construction and has different mechanical and structural characteristics. The coarse aggregate forms an interlocking skeleton structure, providing mechanical strength and resistance to rutting and deformation. A mortar mixture of asphalt, fine aggregate, and mineral powder fills the gaps in the skeleton structure, improving the pavement's compactness and crack resistance.

[0003] Wet oxidation desulfurization is the primary method for desulfurizing coke oven gas. During this process, H2S is primarily recovered as coke sulfur paste. Coke sulfur paste is a form of industrial solid waste that is not only difficult to recycle but also causes significant pollution. Currently, the main purification methods for coke sulfur paste are melting, gasification, and solvent methods. However, these methods often suffer from high energy consumption, large investments, complex operations, and flammable and explosive raw materials. Therefore, the resource recovery and utilization of coke sulfur paste is an important research direction in the coking industry.

[0004] Based on the above-mentioned current status of the treatment of coking sulfur paste, this application proposes an internal skeleton-supported asphalt-rich mixture for pavement and a preparation method thereof to recycle the coking sulfur paste. Summary of the Invention

[0005] In order to realize the resource recovery of coking sulfur paste, the present application provides an internal skeleton-supported asphalt-rich mixture for pavement and a preparation method thereof.

[0006] In the first aspect, the present application provides an internal skeleton for supporting an asphalt-rich mixture for pavement, which adopts the following technical solution:

[0007] An internal skeleton-supported asphalt-rich mixture for pavement comprises the following components by mass: 60-68 parts of coarse aggregate, 16-23 parts of fine aggregate, 8-14 parts of asphalt, 6-9 parts of mineral powder, 3-5 parts of coked sulfur paste, 0.3-0.7 parts of fiber, and 0.25-0.75 parts of an anti-aging agent.

[0008] By adopting the above technical solution, coked sulfur paste is added to the asphalt mixture. The sulfur in the coked sulfur paste can form a rigid network after crystallization to assume part of the bonding performance of the asphalt, thereby maintaining the overall bonding performance of the mixture and effectively improving the high-temperature stability of the mixture; in addition, the low-temperature melting characteristics of the coked sulfur paste can reduce the mixing temperature of the asphalt mixture. At the same time, the coked sulfur paste can form micron-sized crystalline particles after cooling and fill part of the aggregate voids to reduce the use of mineral powder. In this application, the coked sulfur paste is added to the asphalt mixture to achieve the reuse of the coked sulfur paste while ensuring the basic performance of the asphalt mixture, thereby achieving the purpose of resource processing of the coked sulfur paste.

[0009] Preferably, the anti-aging agent includes CPD-650 and hydrotalcite, and the mass ratio of CPD-650 to hydrotalcite is (1-1.5):1.

[0010] By adopting the above technical solution, the amino group of CPD-650 forms hydrogen bonds with the aggregate surface, which enhances the adhesion between asphalt and aggregate. The layered structure of hydrotalcite can block water from penetrating into the asphalt mixture, and the CO3 2- Able to absorb Ca in water 2+ Mg 2+ Therefore, the compound use of CPD-650 and hydrotalcite reduces the peeling of aggregate and asphalt in asphalt mixture caused by moisture and electrolyte corrosion, thereby improving the stability of asphalt mixture.

[0011] Preferably, the fibers include PP fibers and basalt fibers, and the mass ratio of the PP fibers to the basalt fibers is 1:(0.5-0.75).

[0012] Preferably, the fibers include PP fibers and modified basalt fibers, and the mass ratio of the PP fibers to the modified basalt fibers is 1:(0.5-0.75), and the modified basalt fibers are titanium dioxide modified basalt fibers.

[0013] By adopting the above technical solution, titanium dioxide modified basalt fiber can make the titanium dioxide attached to the basalt fiber reflect ultraviolet light, thereby reducing the photo-oxidative aging of asphalt. Titanium dioxide can form active oxygen under light to decompose the carbonyl compounds generated by asphalt aging, further delaying asphalt aging. In addition, titanium dioxide and the polar components in asphalt can form a chemical bond Ti-OC, thereby improving the interfacial bonding strength between the basalt fiber and the asphalt, that is, further making it difficult for the basalt fiber and asphalt to peel off, thereby improving the stability of the asphalt mixture.

[0014] Preferably, the fibers include PP fibers and modified basalt fibers, and the mass ratio of the PP fibers to the modified basalt fibers is 1:(0.5-0.75), and the modified basalt fibers are titanium dioxide and rubber powder modified basalt fibers.

[0015] By adopting the above technical solution, the compound use of PP fiber and modified basalt fiber improves the low-temperature crack resistance of asphalt mixture; by compounding titanium dioxide and rubber powder to modify basalt fiber, the elasticity of rubber powder and the rigidity of titanium dioxide cooperate with each other to make the basalt fiber more tough; in addition, the presence of rubber powder in the modified basalt fiber enables the sulfur in the coked sulfur paste to react with the rubber powder and form a sulfur-rubber cross-linking network, thereby further improving the elastic recovery ability of the asphalt mixture; the sulfur crystals and the rubber network together form a "rigid and flexible" structure to improve the dynamic stability of the asphalt mixture.

[0016] Preferably, the asphalt mixture further comprises 0.6-0.8 parts by mass of a repair agent, wherein the repair agent is epoxidized castor oil and zeolite, and the mass ratio of the epoxidized castor oil to the zeolite is (1-1.5):1.

[0017] By adopting the above technical solution, the long-chain fatty acid epoxy groups in the epoxy castor oil are bonded with the polar components in the asphalt, which reduces the glass transition temperature of the asphalt and improves the low-temperature crack resistance of the asphalt mixture. In addition, the viscosity of the epoxy castor oil decreases under high temperature conditions, so that the epoxy castor oil can penetrate into the microcracks of the asphalt mixture to achieve self-healing of the microcracks in the asphalt mixture; the porous structure of the zeolite can adsorb the epoxy castor oil, so that after the asphalt mixture is paved, the epoxy castor oil in the zeolite can be slowly released to improve the self-healing property of the asphalt mixture.

[0018] Preferably, the asphalt mixture further comprises 0.6 to 0.8 parts by mass of a repair agent, wherein the repair agent is epoxidized castor oil and modified zeolite, the mass ratio of the epoxidized castor oil to the modified zeolite is (1-1.5):1, and the modified zeolite is ferrosoferric oxide modified zeolite.

[0019] By adopting the above technical solution, ferrosoferric oxide, as a magnetic nanomaterial, can generate heat under an alternating magnetic field, thereby promoting the softening and flow of the sulfur network in epoxy castor oil, asphalt and coked sulfur paste, thereby achieving self-healing of asphalt concrete cracks under low temperature conditions.

[0020] In a second aspect, the present application provides a method for preparing an internal skeleton-supported asphalt-rich mixture for pavement, which adopts the following technical solution:

[0021] A method for preparing an internal skeleton-supported asphalt-rich mixture for pavement, comprising the following steps:

[0022] S1. heating the asphalt to between 150°C and 160°C and adding coking sulfur paste to obtain a preform;

[0023] S2. Evenly mix the dried aggregate and mineral powder at a temperature of 150° C. to 160° C., and evenly mix with the premix to obtain a premix;

[0024] S3. Evenly mix the other components with the premix to obtain an asphalt mixture.

[0025] In summary, this application has the following beneficial effects:

[0026] 1. Adding coked sulfur paste to asphalt mixture. The sulfur in the coked sulfur paste can form a rigid network after crystallization to assume part of the bonding performance of the asphalt, thereby maintaining the overall bonding performance of the mixture and effectively improving the high-temperature stability of the mixture. In addition, the low-temperature melting characteristics of the coked sulfur paste can reduce the mixing temperature of the asphalt mixture. At the same time, the coked sulfur paste can form micron-sized crystalline particles after cooling and fill part of the aggregate voids to reduce the use of mineral powder. In this application, the coked sulfur paste is added to the asphalt mixture to ensure the steady improvement of the basic performance of the asphalt mixture, thereby realizing the reuse of the coked sulfur paste, thereby achieving the purpose of resource processing of the coked sulfur paste.

[0027] 2. The method of the present application has the advantage of being easy to operate. DETAILED DESCRIPTION

[0028] The present application is further described in detail below with reference to the preparation examples and examples.

[0029] The raw materials used in this application are all commercially available, among which the basalt fiber has a diameter of (15±5) μm and a length of 6~12 mm; the rubber powder adopts 40~80 mesh waste tire rubber powder; CPD-650 is purchased from Guangdong Xibida New Material Technology Co., Ltd.; the PP fiber monofilament has a diameter of 28±3 μm and a length of 12.5±2.5 mm; the asphalt adopts 90# matrix asphalt; the particle size of the coarse aggregate is 2.36~9.50 mm, and the coarse aggregate is basalt; the fine aggregate is 1.12mm~2.36mm, and the fine aggregate is limestone; the particle size of the mineral powder is 0.01-0.075mm, and the mineral powder is fly ash powder; coking sulfur paste is purchased from Shanxi Yuanli Chemical Co., Ltd., and the coking sulfur paste is dried at 80℃ for 10 hours and then ground to a particle size of 0.2 mm to obtain the coking sulfur paste used in the examples of this application; the hydrotalcite is calcium aluminum type hydrotalcite, and the specific surface area of ​​the hydrotalcite is 120m 2 / g.

[0030] Preparation Example

[0031] Preparation Example 1

[0032] Preparation of titanium dioxide modified basalt fiber

[0033] A method for preparing titanium dioxide-modified basalt fiber comprises the following steps:

[0034] A1. Ultrasonic cleaning of basalt fiber was performed with ethanol for 0.5 h, and the cleaned basalt fiber was immersed in 0.1 mol / L sodium hydroxide solution for 2 h.

[0035] A2. Tetrabutyl titanate, ethanol, water, and acetic acid were prepared in a molar ratio of 1:10:2:0.5. The tetrabutyl titanate and ethanol were evenly mixed, and then an acetic acid aqueous solution (0.3 mol / L) was slowly added. The mixture was then hydrolyzed at 40°C for 30 minutes to form a sol.

[0036] A3, immersing the fiber treated in step A1 into the sol and pulling it at a speed of 2 cm / min at 60°C, with the ratio of fiber to sol being 100 mL of sol for every 5 g of fiber;

[0037] A4. Curing the fiber coated with the sol in an environment of 50% humidity and 80°C for 2 hours to form a uniform titanium dioxide gel coating on the fiber surface;

[0038] A5. Calcine the fiber treated in step A4 at 500° C. for 2 h to obtain titanium dioxide-modified basalt fiber.

[0039] Preparation Example 2

[0040] Preparation of rubber powder and titanium dioxide modified basalt fiber

[0041] A method for preparing rubber powder and titanium dioxide modified basalt fiber comprises the following steps:

[0042] A0. Reacting rubber powder with a 0.2 mol / L sodium hydroxide solution at 60°C for 2 h, then rinsing with deionized water until neutral and drying at 80°C. Immersing the dried rubber powder in a 1% by weight KH-550 ethanol solution, heating to 60°C and reacting for 1 h, to obtain pretreated rubber powder;

[0043] A1. Ultrasonic cleaning of basalt fiber was performed with ethanol for 0.5 h, and the cleaned basalt fiber was immersed in 0.1 mol / L sodium hydroxide solution for 2 h.

[0044] A2. Tetrabutyl titanate, ethanol, water, and acetic acid were prepared in a molar ratio of 1:10:2:0.5. The tetrabutyl titanate and ethanol were evenly mixed, and then an acetic acid solution (0.3 mol / L) was slowly added. The mixture was hydrolyzed at 40°C for 30 min to form a sol. Pretreated rubber powder was added to the sol and ultrasonically dispersed for 1 h to obtain a prefabricated sol, wherein the mass ratio of the pretreated rubber powder to the sol was 1:5, and the frequency of the ultrasonic dispersion was 30 kHz;

[0045] A3, immersing the fiber treated in step A1 into the prefabricated sol and pulling it at a speed of 2 cm / min at 60°C, with the ratio of fiber to sol being 100 mL of sol for every 5 g of fiber;

[0046] A4. Curing the fiber coated with the prefabricated sol in an environment of 50% humidity and 80°C for 2 h to form a uniform titanium dioxide-rubber powder gel coating on the fiber surface;

[0047] A5. Calcine the fiber treated in step A4 at 500° C. for 2 h to obtain titanium dioxide-rubber powder modified basalt fiber.

[0048] Preparation Example 3

[0049] Preparation of repair agent

[0050] a1. Mix 1 kg of castor oil and 1 kg of n-hexane to obtain a mixture;

[0051] a2. Add 1 kg of zeolite to the mixture and ultrasonicate for 1 h to obtain a preform;

[0052] a3. Heat the prefabricated material to 60°C and dry it to obtain the repairing agent.

[0053] Preparation Example 4

[0054] Preparation of repair agent

[0055] a1. Evenly mix 1 kg of epoxy castor oil and 1 kg of n-hexane to obtain a mixture;

[0056] a2. Add 1 kg of zeolite to the mixture and ultrasonicate for 1 h to obtain a preform;

[0057] a3. Heat the prefabricated material to 60°C and dry it to obtain the repairing agent.

[0058] Preparation Example 5

[0059] Preparation of repair agent

[0060] a1. Evenly mix 1.5 kg of epoxy castor oil and 1.5 kg of n-hexane to obtain a mixture;

[0061] a2. Add 1 kg of zeolite to the mixture and ultrasonicate for 1 h to obtain a preform;

[0062] a3. Heat the prefabricated material to 60°C and dry it to obtain the repairing agent.

[0063] Preparation Example 6

[0064] Preparation of repair agent

[0065] a1. Evenly mix 1.3 kg of epoxy castor oil and 1.3 kg of n-hexane to obtain a mixture;

[0066] a2. Add 1 kg of zeolite to the mixture and ultrasonicate for 1 h to obtain a preform;

[0067] a3. Heat the prefabricated material to 60°C and dry it to obtain the repairing agent.

[0068] Preparation Example 7

[0069] Preparation of repair agent

[0070] a1. Dissolve 250 g of FeCl3·6H2O and 120 g of FeCl2·4H2O (molar ratio 2:1) in deionized water, add 1 kg of zeolite, and then dry at 60°C.

[0071] a2. Under nitrogen protection, add ammonia water dropwise until pH = 10, and stir to react for 1.5 hours;

[0072] a3. Collect the ferroferric oxide-loaded zeolite with a magnet, wash with water until neutral, and dry at 60° C. to obtain a modified zeolite;

[0073] a4. Dissolve epoxy castor oil in n-hexane and mix well, then immerse the modified zeolite in the solution and stir for 8 hours to obtain a mixture;

[0074] a5. Evaporate the solvent from the mixture at 60° C. to obtain a repair agent.

[0075] Example

[0076] Example 1

[0077] A method for preparing an internal skeleton-supported asphalt-rich mixture for pavement, comprising the following steps:

[0078] S0. Weigh each component according to mass: 60 kg of coarse aggregate, 16 kg of fine aggregate, 8 kg of asphalt, 6 kg of mineral powder, 3 kg of coked sulfur paste, 0.3 kg of fiber, and 0.25 kg of anti-aging agent, wherein the fiber is PP fiber and the anti-aging agent is CPD-650;

[0079] S1. Heat asphalt to 150°C and add coke sulfur paste to obtain a preform, and dry the coarse aggregate and fine aggregate at 80°C;

[0080] S2. Mixing the dried coarse aggregate, fine aggregate, fiber and mineral powder at a temperature of 130° C. and mixing the mixture with the prefabricated material to obtain a premix;

[0081] S3. Evenly mix the other components with the premix to obtain an asphalt mixture.

[0082] Example 2

[0083] A method for preparing an internal skeleton-supported asphalt-rich mixture for pavement, comprising the following steps:

[0084] S0. Weigh each component according to mass: 68 kg of coarse aggregate, 23 kg of fine aggregate, 14 kg of asphalt, 9 kg of mineral powder, 5 kg of coked sulfur paste, 0.7 kg of fiber, and 0.75 kg of anti-aging agent, wherein the fiber is PP fiber and the anti-aging agent is CPD-650;

[0085] S1. Heat asphalt to 160°C and add coke sulfur paste to obtain a preform, and dry the coarse aggregate and fine aggregate at 80°C;

[0086] S2. Mixing the dried coarse aggregate, fine aggregate, fiber and mineral powder at a temperature of 140° C. and mixing the mixture with the prefabricated material to obtain a premix;

[0087] S3. Evenly mix the other components with the premix to obtain an asphalt mixture.

[0088] Example 3

[0089] A method for preparing an internal skeleton-supported asphalt-rich mixture for pavement, comprising the following steps:

[0090] S0. Weigh each component according to mass: 64 kg of coarse aggregate, 20 kg of fine aggregate, 10 kg of asphalt, 7.5 kg of mineral powder, 4 kg of coked sulfur paste, 0.5 kg of fiber, and 0.5 kg of anti-aging agent, wherein the fiber is PP fiber and the anti-aging agent is CPD-650;

[0091] S1. Asphalt is heated to 155°C and coked sulfur paste is added to obtain a preform, and the coarse aggregate and fine aggregate are dried at 80°C;

[0092] S2. Mixing the dried coarse aggregate, fine aggregate, fiber and mineral powder at a temperature of 135° C. and mixing the mixture with the prefabricated material to obtain a premix;

[0093] S3. Evenly mix the other components with the premix to obtain an asphalt mixture.

[0094] Example 4

[0095] A method for preparing an internal skeleton-supported asphalt-rich mixture for pavement, comprising the following steps:

[0096] S0. Weigh each component according to mass: 64 kg of coarse aggregate, 20 kg of fine aggregate, 10 kg of asphalt, 7.5 kg of mineral powder, 4 kg of coked sulfur paste, 0.5 kg of fiber, and 0.5 kg of anti-aging agent. The fiber is a mixture of PP fiber and basalt fiber, and the mass ratio of PP fiber to basalt fiber is 1:0.5. The anti-aging agent is CPD-650.

[0097] S1. Asphalt is heated to 155°C and coked sulfur paste is added to obtain a preform, and the coarse aggregate and fine aggregate are dried at 80°C;

[0098] S2. Mixing the dried coarse aggregate, fine aggregate, fiber and mineral powder at a temperature of 135° C. and mixing the mixture with the prefabricated material to obtain a premix;

[0099] S3. Evenly mix the other components with the premix to obtain an asphalt mixture.

[0100] Example 5

[0101] A method for preparing an internal skeleton-supported asphalt-rich mixture for pavement, comprising the following steps:

[0102] S0. Weigh each component according to mass: 64 kg of coarse aggregate, 20 kg of fine aggregate, 10 kg of asphalt, 7.5 kg of mineral powder, 4 kg of coked sulfur paste, 0.5 kg of fiber, and 0.5 kg of anti-aging agent. The fiber is a mixture of PP fiber and basalt fiber, and the mass ratio of PP fiber to basalt fiber is 1:0.75:. The anti-aging agent is CPD-650.

[0103] S1. Asphalt is heated to 155°C and coked sulfur paste is added to obtain a preform, and the coarse aggregate and fine aggregate are dried at 80°C;

[0104] S2. Mixing the dried coarse aggregate, fine aggregate, fiber and mineral powder at a temperature of 135° C. and mixing the mixture with the prefabricated material to obtain a premix;

[0105] S3. Evenly mix the other components with the premix to obtain an asphalt mixture.

[0106] Example 6

[0107] A method for preparing an internal skeleton-supported asphalt-rich mixture for pavement, comprising the following steps:

[0108] S0. Weigh each component according to mass: 64 kg of coarse aggregate, 20 kg of fine aggregate, 10 kg of asphalt, 7.5 kg of mineral powder, 4 kg of coked sulfur paste, 0.5 kg of fiber, and 0.5 kg of anti-aging agent. The fiber is a mixture of PP fiber and basalt fiber, and the mass ratio of PP fiber to basalt fiber is 1:0.6. The anti-aging agent is CPD-650.

[0109] S1. Asphalt is heated to 155°C and coked sulfur paste is added to obtain a preform, and the coarse aggregate and fine aggregate are dried at 80°C;

[0110] S2. Mixing the dried coarse aggregate, fine aggregate, fiber and mineral powder at a temperature of 135° C. and mixing the mixture with the prefabricated material to obtain a premix;

[0111] S3. Evenly mix the other components with the premix to obtain an asphalt mixture.

[0112] Example 7

[0113] A method for preparing an internal skeleton-supported asphalt-rich mixture for pavement, comprising the following steps:

[0114] S0. Weigh each component according to mass: 64 kg of coarse aggregate, 20 kg of fine aggregate, 10 kg of asphalt, 7.5 kg of mineral powder, 4 kg of coked sulfur paste, 0.5 kg of fiber, and 0.5 kg of anti-aging agent, wherein the fiber is a mixture of PP fiber and basalt fiber, and the mass ratio of PP fiber to basalt fiber is 1:0.6; the anti-aging agent is CPD-650 and hydrotalcite, and the mass ratio of CPD-650 to hydrotalcite is 1:1;

[0115] S1. Asphalt is heated to 155°C and coked sulfur paste is added to obtain a preform, and the coarse aggregate and fine aggregate are dried at 80°C;

[0116] S2. Mixing the dried coarse aggregate, fine aggregate, fiber and mineral powder at a temperature of 135° C. and mixing the mixture with the prefabricated material to obtain a premix;

[0117] S3. Evenly mix the other components with the premix to obtain an asphalt mixture.

[0118] Example 8

[0119] A method for preparing an internal skeleton-supported asphalt-rich mixture for pavement, comprising the following steps:

[0120] S0. Weigh each component according to mass: 64 kg of coarse aggregate, 20 kg of fine aggregate, 10 kg of asphalt, 7.5 kg of mineral powder, 4 kg of coked sulfur paste, 0.5 kg of fiber, and 0.5 kg of anti-aging agent, wherein the fiber is a mixture of PP fiber and basalt fiber, and the mass ratio of PP fiber to basalt fiber is 1:0.6; the anti-aging agent is CPD-650 and hydrotalcite, and the mass ratio of CPD-650 to hydrotalcite is 1.5:1;

[0121] S1. Asphalt is heated to 155°C and coked sulfur paste is added to obtain a preform, and the coarse aggregate and fine aggregate are dried at 80°C;

[0122] S2. Mixing the dried coarse aggregate, fine aggregate, fiber and mineral powder at a temperature of 135° C. and mixing the mixture with the prefabricated material to obtain a premix;

[0123] S3. Evenly mix the other components with the premix to obtain an asphalt mixture.

[0124] Example 9

[0125] A method for preparing an internal skeleton-supported asphalt-rich mixture for pavement, comprising the following steps:

[0126] S0. Weigh each component according to mass: 64 kg of coarse aggregate, 20 kg of fine aggregate, 10 kg of asphalt, 7.5 kg of mineral powder, 4 kg of coked sulfur paste, 0.5 kg of fiber, and 0.5 kg of anti-aging agent, wherein the fiber is a mixture of PP fiber and basalt fiber, and the mass ratio of PP fiber to basalt fiber is 1:0.6; the anti-aging agent is CPD-650 and hydrotalcite, and the mass ratio of CPD-650 to hydrotalcite is 1.25:1;

[0127] S1. Asphalt is heated to 155°C and coked sulfur paste is added to obtain a preform, and the coarse aggregate and fine aggregate are dried at 80°C;

[0128] S2. Mixing the dried coarse aggregate, fine aggregate, fiber and mineral powder at a temperature of 135° C. and mixing the mixture with the prefabricated material to obtain a premix;

[0129] S3. Evenly mix the other components with the premix to obtain an asphalt mixture.

[0130] Example 10

[0131] A method for preparing an internal skeleton-supported asphalt-rich mixture for pavement, comprising the following steps:

[0132] S0. Weigh each component according to mass: 64 kg of coarse aggregate, 20 kg of fine aggregate, 10 kg of asphalt, 7.5 kg of mineral powder, 4 kg of coked sulfur paste, 0.5 kg of fiber, and 0.5 kg of anti-aging agent, wherein the fiber is a mixture of PP fiber and the modified basalt fiber prepared in Preparation Example 1, and the mass ratio of the PP fiber to the modified basalt fiber mixture is 1:0.6; the anti-aging agent is CPD-650 and hydrotalcite, and the mass ratio of CPD-650 to hydrotalcite is 1.25:1;

[0133] S1. Asphalt is heated to 155°C and coked sulfur paste is added to obtain a preform, and the coarse aggregate and fine aggregate are dried at 80°C;

[0134] S2. Mixing the dried coarse aggregate, fine aggregate, fiber and mineral powder at a temperature of 135° C. and mixing the mixture with the prefabricated material to obtain a premix;

[0135] S3. Evenly mix the other components with the premix to obtain an asphalt mixture.

[0136] Example 11

[0137] A method for preparing an internal skeleton-supported asphalt-rich mixture for pavement, comprising the following steps:

[0138] S0. Weigh each component in parts by mass, including 64 kg of coarse aggregate, 20 kg of fine aggregate, 10 kg of asphalt, 7.5 kg of mineral powder, 4 kg of coked sulfur paste, 0.5 kg of fiber, and 0.5 kg of anti-aging agent, wherein the fiber is a mixture of PP fiber and the modified basalt fiber prepared in Preparation Example 2, and the mass ratio of the PP fiber to the modified basalt fiber mixture is 1:0.6; the anti-aging agent is CPD-650 and hydrotalcite, and the mass ratio of CPD-650 to hydrotalcite is 1.25:1;

[0139] S1. Asphalt is heated to 155°C and coked sulfur paste is added to obtain a preform, and the coarse aggregate and fine aggregate are dried at 80°C;

[0140] S2. Mixing the dried coarse aggregate, fine aggregate, fiber and mineral powder at a temperature of 135° C. and mixing the mixture with the prefabricated material to obtain a premix;

[0141] S3. Evenly mix the other components with the premix to obtain an asphalt mixture.

[0142] Example 12

[0143] A method for preparing an internal skeleton-supported asphalt-rich mixture for pavement, comprising the following steps:

[0144] S0. Weigh each component in parts by mass, including 64 kg of coarse aggregate, 20 kg of fine aggregate, 10 kg of asphalt, 7.5 kg of mineral powder, 4 kg of coked sulfur paste, 0.5 kg of fiber, 0.5 kg of anti-aging agent, and 0.6 kg of repair agent, wherein the fiber is PP fiber and modified basalt fiber, and the mass ratio of PP fiber to modified basalt fiber is 1:0.6, the modified basalt fiber is prepared by Preparation Example 2, the anti-aging agent is a mixture of CPD-650 and hydrotalcite, and the mass ratio of CPD-650 to hydrotalcite is 1.25:1, and the repair agent is castor oil;

[0145] S1. Asphalt is heated to 155°C and coked sulfur paste is added to obtain a preform, and the coarse aggregate and fine aggregate are dried at 80°C;

[0146] S2. Mixing the dried coarse aggregate, fine aggregate, fiber and mineral powder at a temperature of 135° C. and mixing the mixture with the prefabricated material to obtain a premix;

[0147] S3. Evenly mix the other components with the premix to obtain an asphalt mixture.

[0148] Example 13

[0149] A method for preparing an internal skeleton-supported asphalt-rich mixture for pavement, comprising the following steps:

[0150] S0. Weigh each component in parts by mass, including 64 kg of coarse aggregate, 20 kg of fine aggregate, 10 kg of asphalt, 7.5 kg of mineral powder, 4 kg of coked sulfur paste, 0.5 kg of fiber, 0.5 kg of anti-aging agent, and 0.6 kg of repair agent, wherein the fiber is PP fiber and modified basalt fiber, and the mass ratio of PP fiber to modified basalt fiber is 1:06, the modified basalt fiber is prepared by Preparation Example 2, the anti-aging agent is a mixture of CPD-650 and hydrotalcite, and the mass ratio of CPD-650 to hydrotalcite is 1.25:1, and the repair agent is zeolite;

[0151] S1. Asphalt is heated to 155°C and coked sulfur paste is added to obtain a preform, and the coarse aggregate and fine aggregate are dried at 80°C;

[0152] S2. Mixing the dried coarse aggregate, fine aggregate, fiber and mineral powder at a temperature of 135° C. and mixing the mixture with the prefabricated material to obtain a premix;

[0153] S3. Evenly mix the other components with the premix to obtain an asphalt mixture.

[0154] Example 14

[0155] A method for preparing an internal skeleton-supported asphalt-rich mixture for pavement, comprising the following steps:

[0156] S0. Weigh each component in parts by mass, including 64 kg of coarse aggregate, 20 kg of fine aggregate, 10 kg of asphalt, 7.5 kg of mineral powder, 4 kg of coked sulfur paste, 0.5 kg of fiber, 0.5 kg of anti-aging agent, and 0.6 kg of repair agent, wherein the fiber is PP fiber and modified basalt fiber, and the mass ratio of PP fiber to modified basalt fiber is 1:06, the modified basalt fiber is prepared by Preparation Example 2, the anti-aging agent is a mixture of CPD-650 and hydrotalcite, and the mass ratio of CPD-650 to hydrotalcite is 1.25:1, and the repair agent adopts the repair agent prepared in Preparation Example 3;

[0157] S1. heating the asphalt to between 155° C. and adding coked sulfur paste to obtain a preform;

[0158] S2. Mixing the dried aggregate and mineral powder at a temperature of 155° C. and mixing the mixture with the premix to obtain a premix;

[0159] S3. Evenly mix the other components with the premix to obtain an asphalt mixture.

[0160] Example 15

[0161] A method for preparing an internal skeleton-supported asphalt-rich mixture for pavement, comprising the following steps:

[0162] S0. Weigh each component in parts by mass, including 64 kg of coarse aggregate, 20 kg of fine aggregate, 10 kg of asphalt, 7.5 kg of mineral powder, 4 kg of coked sulfur paste, 0.5 kg of fiber, 0.5 kg of anti-aging agent, and 0.6 kg of repair agent, wherein the fiber is PP fiber and modified basalt fiber, and the mass ratio of PP fiber to modified basalt fiber is 1:06, the modified basalt fiber is prepared by Preparation Example 2, the anti-aging agent is a mixture of CPD-650 and hydrotalcite, and the mass ratio of CPD-650 to hydrotalcite is 1.25:1, and the repair agent adopts the repair agent prepared in Preparation Example 4;

[0163] S1. heating the asphalt to between 155° C. and adding coked sulfur paste to obtain a preform;

[0164] S2. Mixing the dried aggregate and mineral powder at a temperature of 155° C. and mixing the mixture with the premix to obtain a premix;

[0165] S3. Evenly mix the other components with the premix to obtain an asphalt mixture.

[0166] Example 16

[0167] A method for preparing an internal skeleton-supported asphalt-rich mixture for pavement, comprising the following steps:

[0168] S0. Weigh each component in parts by mass, including 64 kg of coarse aggregate, 20 kg of fine aggregate, 10 kg of asphalt, 7.5 kg of mineral powder, 4 kg of coked sulfur paste, 0.5 kg of fiber, 0.5 kg of anti-aging agent, and 0.6 kg of repair agent, wherein the fiber is PP fiber and modified basalt fiber, and the mass ratio of PP fiber to modified basalt fiber is 1:06, the modified basalt fiber is prepared by Preparation Example 2, the anti-aging agent is a mixture of CPD-650 and hydrotalcite, and the mass ratio of CPD-650 to hydrotalcite is 1.25:1, and the repair agent adopts the repair agent prepared in Preparation Example 5;

[0169] S1. heating the asphalt to between 155° C. and adding coked sulfur paste to obtain a preform;

[0170] S2. Mixing the dried aggregate and mineral powder at a temperature of 155° C. and mixing the mixture with the premix to obtain a premix;

[0171] S3. Evenly mix the other components with the premix to obtain an asphalt mixture.

[0172] Example 17

[0173] A method for preparing an internal skeleton-supported asphalt-rich mixture for pavement, comprising the following steps:

[0174] S0. Weigh each component in parts by mass, including 64 kg of coarse aggregate, 20 kg of fine aggregate, 10 kg of asphalt, 7.5 kg of mineral powder, 4 kg of coked sulfur paste, 0.5 kg of fiber, 0.5 kg of anti-aging agent, and 0.6 kg of repair agent, wherein the fiber is PP fiber and modified basalt fiber, and the mass ratio of PP fiber to modified basalt fiber is 1:06, the modified basalt fiber is prepared by Preparation Example 2, the anti-aging agent is a mixture of CPD-650 and hydrotalcite, and the mass ratio of CPD-650 to hydrotalcite is 1.25:1, and the repair agent adopts the repair agent prepared in Preparation Example 6;

[0175] S1. heating the asphalt to between 155° C. and adding coked sulfur paste to obtain a preform;

[0176] S2. Mixing the dried aggregate and mineral powder at a temperature of 155° C. and mixing the mixture with the premix to obtain a premix;

[0177] S3. Evenly mix the other components with the premix to obtain an asphalt mixture.

[0178] Example 18

[0179] A method for preparing an internal skeleton-supported asphalt-rich mixture for pavement, comprising the following steps:

[0180] S0. Weigh each component in parts by mass, including 64 kg of coarse aggregate, 20 kg of fine aggregate, 10 kg of asphalt, 7.5 kg of mineral powder, 4 kg of coked sulfur paste, 0.5 kg of fiber, 0.5 kg of anti-aging agent, and 0.6 kg of repair agent, wherein the fiber is PP fiber and modified basalt fiber, and the mass ratio of PP fiber to modified basalt fiber is 1:06, the modified basalt fiber is prepared by Preparation Example 2, the anti-aging agent is a mixture of CPD-650 and hydrotalcite, and the mass ratio of CPD-650 to hydrotalcite is 1.25:1, and the repair agent adopts the repair agent prepared in Preparation Example 7;

[0181] S1. heating the asphalt to between 155° C. and adding coked sulfur paste to obtain a preform;

[0182] S2. Mixing the dried aggregate and mineral powder at a temperature of 155° C. and mixing the mixture with the premix to obtain a premix;

[0183] S3. Evenly mix the other components with the premix to obtain an asphalt mixture.

[0184] Example 19

[0185] A method for preparing an internal skeleton-supported asphalt-rich mixture for pavement, comprising the following steps:

[0186] S0. Weigh each component in parts by mass, including 64 kg of coarse aggregate, 20 kg of fine aggregate, 10 kg of asphalt, 7.5 kg of mineral powder, 4 kg of coked sulfur paste, 0.5 kg of fiber, 0.5 kg of anti-aging agent, and 0.1 kg of rubber powder, wherein the fiber is PP fiber and modified basalt fiber, and the mass ratio of PP fiber to modified basalt fiber is 0.6:1, the modified basalt fiber is prepared by Preparation Example 1, and the anti-aging agent is a mixture of CPD-650 and hydrotalcite, and the mass ratio of CPD-650 to hydrotalcite is 1.25:1;

[0187] S1. heating the asphalt to between 155° C. and adding coked sulfur paste to obtain a preform;

[0188] S2. Mixing the dried aggregate and mineral powder at a temperature of 155° C. and mixing the mixture with the premix to obtain a premix;

[0189] S3. Evenly mix the other components with the premix to obtain an asphalt mixture.

[0190] Comparative Example

[0191] Comparative Example 1

[0192] A method for preparing an internal skeleton-supported asphalt-rich mixture for pavement, comprising the following steps:

[0193] S0. Weigh each component according to mass: 60 kg of coarse aggregate, 16 kg of fine aggregate, 8 kg of asphalt, 6 kg of mineral powder, 0.3 kg of fiber, and 0.25 kg of anti-aging agent, wherein the fiber is PP fiber and the anti-aging agent is CPD-650;

[0194] S1. Heat asphalt to 160°C and add coke sulfur paste to obtain a preform, and dry the coarse aggregate and fine aggregate at 80°C;

[0195] S2. Mixing the dried coarse aggregate, fine aggregate, fiber and mineral powder at a temperature of 150° C. and mixing the mixture with the prefabricated material to obtain a premix;

[0196] S3. Evenly mix the other components with the premix to obtain an asphalt mixture.

[0197] Comparative Example 2

[0198] A method for preparing an internal skeleton-supported asphalt-rich mixture for pavement, comprising the following steps:

[0199] S0. Weigh each component according to mass: 60 kg of coarse aggregate, 16 kg of fine aggregate, 8 kg of asphalt, 6 kg of mineral powder, 0.3 kg of fiber, and 0.25 kg of anti-aging agent, wherein the fiber is PP fiber and the anti-aging agent is CPD-650;

[0200] S1. Heat asphalt to 150°C and add coke sulfur paste to obtain a preform, and dry the coarse aggregate and fine aggregate at 80°C;

[0201] S2. Mixing the dried coarse aggregate, fine aggregate, fiber and mineral powder at a temperature of 150° C. and mixing the mixture with the prefabricated material to obtain a premix;

[0202] S3. Evenly mix the other components with the premix to obtain an asphalt mixture.

[0203] Performance testing

[0204] Detection method

[0205] According to the "Test Procedures for Asphalt and Asphalt Mixtures in Highway Engineering" (JTG E20-2011), the tensile strength ratio, low-temperature bending strain (-10℃), dynamic stability and Marshall stability of asphalt mixtures were tested in freeze-thaw splitting tests.

[0206] Table 1

[0207] Combining Example 1 with Comparative Example 1 and Comparative Example 2 and Table 1, it can be seen that the addition of coking sulfur paste significantly improves the dynamic stability and Marshall stability of the asphalt mixture. The reason is that the addition of coking sulfur paste can cause the sulfur in the coking sulfur paste to crystallize and form a rigid network to assume part of the bonding performance of the asphalt, thereby improving the high-temperature stability of the mixture; in addition, the addition of coking sulfur paste reduces the mixing temperature of the asphalt mixture.

[0208] From Example 11 and Example 19 and Table 1, it can be seen that the addition of titanium dioxide modified basalt fiber and rubber powder separately improves the various performances of the asphalt mixture compared with the titanium dioxide and rubber powder modified basalt fiber. The reason is that the titanium dioxide and rubber powder modified basalt fiber can make the elasticity of the rubber powder and the rigidity of titanium dioxide cooperate with each other to make the basalt fiber more tough. In addition, the sulfur-rubber cross-linking network formed by the rubber powder and the sulfur in the coked sulfur paste improves the elastic recovery ability of the asphalt mixture, and at the same time improves the bonding strength between the fiber and the asphalt mixture, making it less likely for cracks to appear between the fiber and the asphalt mixture, thereby improving the stability of the asphalt mixture.

[0209] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed, but as long as they are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. An internal skeleton supporting asphalt-rich mixture for pavement, characterized in that: The material comprises the following components by mass: 60-68 parts of coarse aggregate, 16-23 parts of fine aggregate, 8-14 parts of asphalt, 6-9 parts of mineral powder, 3-5 parts of coked sulfur paste, 0.3-0.7 parts of fiber and 0.25-0.75 parts of anti-aging agent.

2. The asphalt-rich mixture supported by an internal skeleton for pavement according to claim 1, characterized in that: The anti-aging agent includes CPD-650 and hydrotalcite, and the mass ratio of CPD-650 to hydrotalcite is (1-1.5):

1.

3. The asphalt-rich mixture supported by an internal skeleton for pavement according to claim 1, characterized in that: The fibers include PP fibers and basalt fibers, and the mass ratio of the PP fibers to the basalt fibers is 1:(0.5-0.75).

4. The asphalt-rich mixture supported by an internal skeleton for pavement according to claim 2, characterized in that: The fibers include PP fibers and modified basalt fibers, and the mass ratio of the PP fibers to the modified basalt fibers is 1:(0.5-0.75). The modified basalt fibers are titanium dioxide modified basalt fibers.

5. The asphalt-rich mixture supported by an internal skeleton for pavement according to claim 2, characterized in that: The fibers include PP fibers and modified basalt fibers, and the mass ratio of the PP fibers to the modified basalt fibers is 1:(0.5-0.75). The modified basalt fibers are titanium dioxide and rubber powder modified basalt fibers.

6. The asphalt-rich mixture supported by an internal skeleton for pavement according to claim 1, characterized in that: The asphalt mixture further includes 0.6 to 0.8 parts by weight of a repair agent, wherein the repair agent is epoxidized castor oil and zeolite, and the mass ratio of the epoxidized castor oil to the zeolite is (1-1.5):

1.

7. The asphalt-rich mixture supported by an internal skeleton for pavement according to claim 1, characterized in that: The asphalt mixture also includes 0.6 to 0.8 parts by mass of a repair agent, which is epoxidized castor oil and modified zeolite. The mass ratio of the epoxidized castor oil to the modified zeolite is (1-1.5):1, and the modified zeolite is ferrosoferric oxide modified zeolite.

8. A method for preparing an internal skeleton-supported asphalt-rich mixture for pavement, characterized in that: The following steps are involved: S1. Heating asphalt to 150°C to 160°C and adding coking sulfur paste to obtain a prefabricated product, and drying the coarse aggregate and fine aggregate; S2. Mixing the dried coarse aggregate, fine aggregate, fiber and mineral powder at a temperature of 130° C. to 140° C., and then mixing the mixture with the prefabricated material to obtain a premix; S3. Evenly mix the other components with the premix to obtain an asphalt mixture.

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