High-strength phase-change carbonation steel slag for water-stable base layer and preparation method thereof

Abstract

The application discloses a kind of high-strength phase-change carbon fixation steel slag for water-stable base and preparation method, belong to water-stable base crack resistance technical field, the preparation raw material of high-strength phase-change carbon fixation steel slag for water-stable base includes phosphoric acid solution, steel slag, SBS modifier, biochar, phase change material, nano film-forming material, nano reinforcing material.Preparation method includes that porous steel slag is obtained by mixing phosphoric acid solution with steel slag;Biochar prepared from corn straw is ground into powder, phase change material is added, to obtain the biochar of phase change material loading;SBS modifier, the biochar of phase change material loading and nano film-forming material are mixed with porous steel slag in batches, then nano reinforcing material is added, after being mixed uniformly, to obtain the high-strength phase-change carbon fixation steel slag for water-stable base.The application utilizes the energy storage effect of phase change material, enhances crack resistance, inhibits the development and evolution of temperature crack, and better combines with the cementing material of water-stable base and other aggregate, maintains excellent stable temperature control performance.

Description

Technical Field

[0001] This invention belongs to the field of crack-resistant technology for water-stabilized base courses, specifically relating to a steel slag for water-stabilized base courses, and more particularly to a high-strength phase transformation carbon-fixing steel slag for water-stabilized base courses and its preparation method. Background Technology

[0002] Semi-rigid base courses are the most commonly used base course form in road construction. Among them, cement-stabilized crushed stone base courses are widely used due to their high mechanical strength, good stability, and high economic efficiency.

[0003] Cement-stabilized crushed stone base course, also known as water-stabilized base course, performs well in most cases during the service of water-stabilized base course roads. However, it still has a significant weakness: it is prone to cracking under periodic temperature changes. Once these cracks form, they may adversely affect the overall structure of the road and thus shorten its service life.

[0004] The presence of cracks in road surfaces not only weakens the load-bearing capacity of water-stabilized base courses but can also lead to water damage and freeze-thaw cycle failure, further deteriorating the stability of the road structure. To overcome the cracking problem of water-stabilized base courses under temperature variation conditions, researchers have begun to explore adding specific admixtures to improve their performance.

[0005] Phase change materials (PCMs) undergo a phase change when the ambient temperature changes, typically a change between a solid and a liquid state. During this phase change, they can absorb or release heat, thus enabling heat storage in high-temperature environments and heat release in low-temperature environments, thereby achieving automatic temperature control. If PCMs were used in road construction, they could significantly improve the problem of road cracking caused by temperature changes. However, there are currently no reports of existing technologies using PCMs in road construction. Furthermore, PCMs cannot be directly incorporated into water-stabilized base courses in road construction because, without encapsulation, they are difficult to uniformly bond with the base course material to form a dense structure. Moreover, leakage during the phase change process can also lead to PCM loss, hindering the achievement of effective temperature self-control. Summary of the Invention

[0006] The purpose of this invention is to provide a high-strength phase change carbon-fixing steel slag for water-stabilized base courses, capable of reliably coating phase change materials and uniformly mixing them with other road materials, and a method for its preparation, in order to solve the above-mentioned problems.

[0007] The present invention achieves the above objectives through the following technical solutions:

[0008] A high-strength phase change carbon-fixing steel slag for water-stabilized base courses is prepared by means of the following raw materials in parts by weight: 1-2 parts of phosphoric acid solution, 30-50 parts of steel slag, 1-3 parts of SBS modifier, 5-10 parts of biochar, 6-8 parts of phase change material, 35-55 parts of nano-film-forming material, and 1-3 parts of nano-reinforcing material.

[0009] Preferably, the SBS modifier is a styrene-butadiene-styrene triblock copolymer.

[0010] Preferably, the phase change material is polyethylene glycol.

[0011] Preferably, the nanofilm-forming material comprises 25-35 parts by weight of nanofilm-forming material component A and 10-20 parts by weight of nanofilm-forming material component B.

[0012] Preferably, component A of the nanofilm-forming material is epoxy asphalt, and component B of the nanofilm-forming material is spherical nanocellulose with a diameter of 20-60 nm, prepared by an oxidation process.

[0013] Preferably, the nano-reinforcing material is SiO2 nanoparticles.

[0014] A method for preparing high-strength phase transformation carbon-fixed steel slag for water-stabilized base courses includes the following steps:

[0015] Step S1: Mix the phosphoric acid solution with the steel slag, place it in a constant temperature magnetic stirrer, and stir at room temperature for 4-6 hours to obtain porous steel slag.

[0016] Step S2: Crush the dried corn stalks into granules and place them in a quartz boat. Maintain them in a tube furnace environment with N2 protection at a purge rate of 60 mL / min and a purity of 99.99%. Control the heating rate at 10℃ / min. Heat the crushed corn stalks into granules from room temperature to 400℃ for pyrolysis and keep them at a constant temperature for 2.5 h to obtain biochar. Grind the biochar into powder in a mortar and pass it through a 150-mesh sieve to obtain biochar powder. Add phase change material with a molecular weight of 2000 and biochar powder to a container containing deionized water in sequence. After ultrasonic dispersion at room temperature for 90 min, place the system in a vacuum oven and dry it at a constant temperature for 24 h. After the system cools to room temperature, biochar loaded with phase change material is obtained.

[0017] Step S3: Mix the non-clumping SBS modifier, the biochar loaded with the phase change material, and the nano-film-forming material with the porous steel slag in batches, adding them completely within 30 minutes. Then, stir evenly in a constant temperature magnetic stirrer for 6 hours. After thorough mixing, add the nano-reinforcing material and mix evenly to obtain the high-strength phase change carbon-fixing steel slag for water-stabilized base layer.

[0018] Preferably, in step S3, the nanofilm-forming material comprises 25-35 parts by weight of epoxy asphalt and 10-20 parts by weight of spherical nanocellulose.

[0019] Preferably, the method for preparing the epoxy asphalt includes the following steps:

[0020] Step A1: Melt 30 parts by weight of base asphalt at 150°C and place it in a beaker. Add 5-20 parts by weight of epoxy asphalt compatibilizer, 10-20 parts by weight of sebacic acid, 10-20 parts by weight of polysaccharide, and 10-20 parts by weight of methyltetraaminophthalic anhydride in batches. Stir thoroughly at 15°C for 1 hour to obtain epoxy asphalt component A.

[0021] Step A2: Mix the epoxy asphalt component A with epoxy resin and place it in an electric thermostatic drying oven. Heat it to 150°C until it is completely melted into a homogeneous fluid. Remove it and place it in a beaker. Mix and stir evenly. Pour it into a PTFE mold and cure it sequentially at 155°C for 8 hours, 125°C for 12 hours, and 175°C for 8 hours. Remove it and cool it at room temperature to obtain the epoxy asphalt.

[0022] Preferably, the preparation method of the spherical nanocellulose is as follows: cellulose is thoroughly mixed with a NaOH solution of 5% to 15% by mass at a mass ratio of 1:40 to 1:60, chlorine gas is introduced, the pH value of the system is maintained at 6 to 8, and after 12 to 24 hours, the spherical nanocellulose with a diameter of 20-60 nm prepared by the oxidation process can be obtained.

[0023] The beneficial effects of this invention are as follows:

[0024] This invention incorporates phase change materials (PCMs) into a water-stabilized base course. Utilizing the energy storage capacity of PCMs, it significantly reduces the temperature stress generated within the base course during temperature changes, enhancing crack resistance and inhibiting the development and evolution of temperature cracks. The PCMs are solidified within biochar and then combined with porous steel slag for enhanced PCM stabilization. A nanofilm-forming material further encapsulates the PCMs to prevent leakage and facilitates better bonding with cementitious materials and other aggregates in the water-stabilized base course, forming a uniform and dense structure that maintains excellent and stable temperature control performance during long-term service. In application, the high-strength PCM-based carbon-fixed steel slag is mixed with other raw materials of the water-stabilized base course. At high temperatures, the PCMs undergo a phase change from solid to liquid, absorbing a large amount of heat while maintaining a nearly constant temperature. At low temperatures, they undergo a phase change from liquid to solid, releasing a large amount of heat while maintaining a nearly constant temperature, thus achieving automatic temperature control for the water-stabilized base course pavement. Attached Figure Description

[0025] Figure 1 This is a flowchart of a method for preparing high-strength phase transformation carbon-fixed steel slag for water-stabilized base courses according to the present invention;

[0026] Figure 2 This is a flowchart of the preparation method of epoxy asphalt according to the present invention;

[0027] Figure 3 This is a flowchart of the preparation method of the spherical nanocellulose described in this invention. Detailed Implementation

[0028] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0029] like Figure 1 As shown, the preparation method of high-strength phase transformation carbon-fixing steel slag for water-stabilized base course according to the present invention includes the following steps:

[0030] Step S1: Mix 1-2 parts by weight of phosphoric acid solution with 30-50 parts by weight of steel slag, place the mixture in a constant temperature magnetic stirrer, and stir at room temperature for 4-6 hours to obtain porous steel slag.

[0031] Step S2: Crush dried corn stalks into granules and place them in a quartz boat. Maintain this in a N2-protected tubular furnace environment with a purging rate of 60 mL / min and a purity of 99.99%, controlling the heating rate at 10℃ / min. Heat the crushed corn stalks into granules from room temperature to 400℃ for pyrolysis, and keep them at a constant temperature for 2.5 hours to obtain biochar. Grind 5-10 parts by weight of the biochar into powder in a mortar and pass it through a 150-mesh sieve to obtain biochar powder. Add 6-8 parts by weight of a phase change material with a molecular weight of 2000 and the biochar powder sequentially to a container containing deionized water. After ultrasonic dispersion at room temperature for 90 minutes, place the system in a vacuum oven and dry it at a constant temperature for 24 hours. After the system cools to room temperature, biochar loaded with phase change material is obtained; the phase change material is polyethylene glycol.

[0032] Step S3: 1-3 parts by weight of the non-clumping SBS modifier, the biochar loaded with the phase change material, and 35-55 parts by weight of the nano-film-forming material are mixed with the porous steel slag in batches, completely added within 30 minutes. Then, the mixture is stirred uniformly in a constant-temperature magnetic stirrer for 6 hours. After thorough mixing, 1-3 parts by weight of the nano-reinforcing material are added, and the mixture is stirred evenly to obtain the high-strength phase change carbon-fixing steel slag for water-stabilized base courses. The SBS modifier is a styrene-butadiene-styrene triblock copolymer. The nano-film-forming material includes 25-35 parts by weight of nano-film-forming material component A and 10-20 parts by weight of nano-film-forming material component B. Nano-film-forming material component A is preferably epoxy asphalt, and nano-film-forming material component B is preferably spherical nanocellulose. The nano-reinforcing material is SiO2 nanoparticles.

[0033] like Figure 2 As shown, the preparation method of the epoxy asphalt includes the following steps:

[0034] Step A1: Melt 30 parts by weight of base asphalt at 150°C and place it in a beaker. Add 5-20 parts by weight of epoxy asphalt compatibilizer, 10-20 parts by weight of sebacic acid, 10-20 parts by weight of polysaccharide, and 10-20 parts by weight of methyltetraaminophthalic anhydride in batches. Stir thoroughly at 15°C for 1 hour to obtain epoxy asphalt component A.

[0035] Step A2: Mix the epoxy asphalt component A with epoxy resin and place it in an electric thermostatic drying oven. Heat it to 150°C until it is completely melted into a homogeneous fluid. Remove it and place it in a beaker. Mix and stir evenly. Pour it into a PTFE mold and cure it sequentially at 155°C for 8 hours, 125°C for 12 hours, and 175°C for 8 hours. Remove it and cool it at room temperature to obtain the epoxy asphalt.

[0036] like Figure 3 As shown, the preparation method of the spherical nanocellulose is as follows: cellulose is thoroughly mixed with a NaOH solution of 5% to 15% by mass at a mass ratio of 1:40 to 1:60, chlorine gas is introduced, and the pH value of the system is maintained at 6 to 8. After 12 to 24 hours, the spherical nanocellulose with a diameter of 20-60 nm prepared by oxidation process can be obtained.

[0037] The present invention will be further described below with reference to two specific embodiments.

[0038] Example 1:

[0039] A method for preparing high-strength phase transformation carbon-fixed steel slag for water-stabilized base courses is described below:

[0040] Step S1: Mix 1 part by mass of phosphoric acid solution with 33 parts by mass of steel slag, place the mixture in a constant temperature magnetic stirrer, and stir at room temperature for 4 to 6 hours to obtain porous steel slag.

[0041] Step S2: Crush dried corn stalks into granules and place them in a quartz boat. Maintain a N2 protected tube furnace environment with a purging rate of 60 mL / min and a purity of 99.99%, and control the heating rate at 10℃ / min. Heat the crushed corn stalks into granules from room temperature to 400℃ for pyrolysis, and keep them at a constant temperature for 2.5 hours to obtain biochar. Grind 9 parts by weight of the biochar into powder in a mortar and pass it through a 150-mesh sieve to obtain biochar powder. Add 7 parts by weight of phase change material with a molecular weight of 2000 and biochar powder to a container containing deionized water. After ultrasonic dispersion at room temperature for 90 minutes, place the system in a vacuum oven and dry it at a constant temperature for 24 hours. After the system cools to room temperature, biochar loaded with phase change material is obtained; the phase change material is polyethylene glycol.

[0042] Step S3: Mix 2 parts by weight of the non-clumping SBS modifier, the biochar loaded with the phase change material, and 45 parts by weight of the nano-film-forming material with the porous steel slag in batches, adding them completely within 30 minutes. Then, stir uniformly in a constant-temperature magnetic stirrer for 6 hours to ensure thorough mixing. After this, add 2 parts by weight of the nano-reinforcing material and mix evenly to obtain the high-strength phase change carbon-fixing steel slag for water-stabilized base course. The SBS modifier is a styrene-butadiene-styrene triblock copolymer. The nano-film-forming material comprises 30 parts by weight of nano-film-forming material component A and 15 parts by weight of nano-film-forming material component B. Component A is preferably epoxy asphalt, and component B is preferably spherical nanocellulose. The nano-reinforcing material is SiO2 nanoparticles.

[0043] The preparation method of the epoxy asphalt includes the following steps:

[0044] Step A1: Melt 30 parts by weight of base asphalt at 150°C and place it in a beaker. Add 5-20 parts by weight of epoxy asphalt compatibilizer, 10-20 parts by weight of sebacic acid, 10-20 parts by weight of polysaccharide, and 10-20 parts by weight of methyltetraaminophthalic anhydride in batches. Stir thoroughly at 15°C for 1 hour to obtain epoxy asphalt component A.

[0045] Step A2: Mix the epoxy asphalt component A with epoxy resin and place it in an electric thermostatic drying oven. Heat it to 150°C until it is completely melted into a homogeneous fluid. Remove it and place it in a beaker. Mix and stir evenly. Pour it into a PTFE mold and cure it sequentially at 155°C for 8 hours, 125°C for 12 hours, and 175°C for 8 hours. Remove it and cool it at room temperature to obtain the epoxy asphalt.

[0046] The preparation method of the spherical nanocellulose is as follows: cellulose is thoroughly mixed with a NaOH solution of 5% to 15% by mass at a mass ratio of 1:40 to 1:60, chlorine gas is introduced, and the pH value of the system is maintained at 6 to 8. After 12 to 24 hours, the spherical nanocellulose with a diameter of 20-60 nm prepared by oxidation process can be obtained.

[0047] Example 2:

[0048] A method for preparing high-strength phase transformation carbon-fixed steel slag for water-stabilized base courses is described below:

[0049] Step S1: Mix 2 parts by mass of phosphoric acid solution with 33 parts by mass of steel slag, place the mixture in a constant temperature magnetic stirrer, and stir at room temperature for 4 to 6 hours to obtain porous steel slag.

[0050] Step S2: Crush dried corn stalks into granules and place them in a quartz boat. Maintain a N2 protected tube furnace environment with a purging rate of 60 mL / min and a purity of 99.99%, and control the heating rate at 10℃ / min. Heat the crushed corn stalks into granules from room temperature to 400℃ for pyrolysis, and keep them at a constant temperature for 2.5 hours to obtain biochar. Grind 9 parts by weight of the biochar into powder in a mortar and pass it through a 150-mesh sieve to obtain biochar powder. Add 7 parts by weight of phase change material with a molecular weight of 2000 and biochar powder to a container containing deionized water. After ultrasonic dispersion at room temperature for 90 minutes, place the system in a vacuum oven and dry it at a constant temperature for 24 hours. After the system cools to room temperature, biochar loaded with phase change material is obtained; the phase change material is polyethylene glycol.

[0051] Step S3: Mix 1 part by weight of the non-clumping SBS modifier, the biochar loaded with the phase change material, and 45 parts by weight of the nano-film-forming material with the porous steel slag in batches, adding them completely within 30 minutes. Then, stir evenly in a constant temperature magnetic stirrer for 6 hours to ensure thorough mixing. After that, add 2 parts by weight of the nano-reinforcing material and mix evenly to obtain the high-strength phase change carbon-fixing steel slag for water-stabilized base course. The SBS modifier is a styrene-butadiene-styrene triblock copolymer. The nano-film-forming material includes 30 parts by weight of nano-film-forming material component A and 15 parts by weight of nano-film-forming material component B. Nano-film-forming material component A is preferably epoxy asphalt, and nano-film-forming material component B is preferably spherical nanocellulose. The nano-reinforcing material is SiO2 nanoparticles.

[0052] The preparation method of the epoxy asphalt includes the following steps:

[0053] Step A1: Melt 30 parts by weight of base asphalt at 150°C and place it in a beaker. Add 5-20 parts by weight of epoxy asphalt compatibilizer, 10-20 parts by weight of sebacic acid, 10-20 parts by weight of polysaccharide, and 10-20 parts by weight of methyltetraaminophthalic anhydride in batches. Stir thoroughly at 15°C for 1 hour to obtain epoxy asphalt component A.

[0054] Step A2: Mix the epoxy asphalt component A with epoxy resin and place it in an electric thermostatic drying oven. Heat it to 150°C until it is completely melted into a homogeneous fluid. Remove it and place it in a beaker. Mix and stir evenly. Pour it into a PTFE mold and cure it sequentially at 155°C for 8 hours, 125°C for 12 hours, and 175°C for 8 hours. Remove it and cool it at room temperature to obtain the epoxy asphalt.

[0055] The preparation method of the spherical nanocellulose is as follows: cellulose is thoroughly mixed with a NaOH solution of 5% to 15% by mass at a mass ratio of 1:40 to 1:60, chlorine gas is introduced, and the pH value of the system is maintained at 6 to 8. After 12 to 24 hours, the spherical nanocellulose with a diameter of 20-60 nm prepared by oxidation process can be obtained.

[0056] Performance tests were conducted on the high-strength phase change carbon-fixed steel slag used in the water-stabilized base course obtained in Examples 1 and 2. The product of the invention patent application with patent number "202311604386.2" entitled "An anti-collision energy-absorbing foamed steel slag concrete and its preparation method" was used as Comparative Example 1, and the product of the invention patent application with patent number "202310614316.9" entitled "A waste steel slag recycled asphalt pavement material and its preparation method" was used as Comparative Example 2. The following test results were obtained:

[0057] <![CDATA[Dynamic stability / (times·mm -1 )]]> 6083 5989 4302 2983 ≥3000 Flexural tensile strength (MPa) 9206 8970 3200 4890 ≥2800MPa

[0058] The performance test results of the above samples show that the high-strength phase change carbon-fixed steel slag for water-stabilized base courses prepared by the present invention is far superior to Control Example 1 and Control Example 2 in terms of high-temperature stability and low-temperature crack resistance. Furthermore, the high-strength phase change carbon-fixed steel slag for water-stabilized base courses prepared by the present invention uses porous steel slag, which can eliminate environmental pollution and is an important way to achieve sustainable development. The high-strength phase change carbon-fixed steel slag for water-stabilized base courses and its preparation method proposed in this invention also have the characteristic of resistance to low-temperature cracking compared to ordinary crushed stone, making it suitable for repairing road surface cracks in cold regions with large diurnal and seasonal temperature differences, preventing secondary cracking damage to road surface cracks under temperature stress. Moreover, the high-strength phase change carbon-fixed steel slag for water-stabilized base courses and its preparation method proposed in this invention effectively integrate the inherent properties of porous steel slag and biochar, showing significant advantages in strengthening environmental protection and promoting sustainable development, and providing a practical technical solution for building a green and low-carbon built environment.

[0059] The above embodiments are merely preferred embodiments of the present invention and are not intended to limit the technical solutions of the present invention. Any technical solution that can be implemented based on the above embodiments without creative effort should be considered to fall within the scope of protection of the patent of the present invention.

Claims

1. A high-strength phase transformation carbon-fixing steel slag for water-stabilized base courses, characterized in that: The raw materials for its preparation include the following parts by weight: 1-2 parts phosphoric acid solution, 30-50 parts steel slag, 1-3 parts SBS modifier, 5-10 parts biochar, 6-8 parts phase change material, 35-55 parts nanofilm-forming material, and 1-3 parts nanoreinforcing material; the nanofilm-forming material includes 25-35 parts by weight of epoxy asphalt and 10-20 parts by weight of spherical nanocellulose with a diameter of 20-60 nm prepared by an oxidation process; The preparation method of the high-strength phase transformation carbon-fixing steel slag for the water-stabilized base course includes the following steps: Step S1: Mix the phosphoric acid solution with the steel slag, place it in a constant temperature magnetic stirrer, and stir at room temperature for 4-6 hours to obtain porous steel slag. Step S2: Crush the dried corn stalks into granules and place them in a quartz boat. Maintain them in a tube furnace environment with N2 protection at a purge rate of 60 mL / min and a purity of 99.99%. Control the heating rate at 10℃ / min. Heat the crushed corn stalks into granules from room temperature to 400℃ for pyrolysis and keep them at a constant temperature for 2.5h to obtain biochar. Grind the biochar into powder in a mortar and pass it through a 150-mesh sieve to obtain biochar powder. Add phase change material with a molecular weight of 2000 and biochar powder to a container containing deionized water in sequence. After ultrasonic dispersion at room temperature for 90 min, place the system in a vacuum oven and dry it at a constant temperature for 24h. After the system cools to room temperature, biochar loaded with phase change material is obtained. Step S3: Mix the non-clumping SBS modifier, the biochar loaded with the phase change material, and the nano-film-forming material with the porous steel slag in batches, adding them completely within 30 minutes. Then, stir evenly in a constant temperature magnetic stirrer for 6 hours. After thorough mixing, add the nano-reinforcing material and mix evenly to obtain the high-strength phase change carbon-fixing steel slag for water-stabilized base layer.

2. The high-strength phase transformation carbon-fixing steel slag for water-stabilized base course according to claim 1, characterized in that: The SBS modifier is a styrene-butadiene-styrene triblock copolymer.

3. The high-strength phase transformation carbon-fixing steel slag for water-stabilized base course according to claim 1, characterized in that: The phase change material is polyethylene glycol.

4. The high-strength phase transformation carbon-fixing steel slag for water-stabilized base course according to claim 1, characterized in that: The nano-reinforcing material is SiO2 nanoparticles.

5. A method for preparing high-strength phase transformation carbon-fixing steel slag for water-stabilized base courses as described in any one of claims 1-4, characterized in that: Includes the following steps: Step S1: Mix the phosphoric acid solution with the steel slag, place it in a constant temperature magnetic stirrer, and stir at room temperature for 4-6 hours to obtain porous steel slag. Step S2: Crush the dried corn stalks into granules and place them in a quartz boat. Maintain them in a tube furnace environment with N2 protection at a purge rate of 60 mL / min and a purity of 99.99%. Control the heating rate at 10℃ / min. Heat the crushed corn stalks into granules from room temperature to 400℃ for pyrolysis and keep them at a constant temperature for 2.5h to obtain biochar. Grind the biochar into powder in a mortar and pass it through a 150-mesh sieve to obtain biochar powder. Add phase change material with a molecular weight of 2000 and biochar powder to a container containing deionized water in sequence. After ultrasonic dispersion at room temperature for 90 min, place the system in a vacuum oven and dry it at a constant temperature for 24h. After the system cools to room temperature, biochar loaded with phase change material is obtained. Step S3: Mix the non-clumping SBS modifier, the biochar loaded with the phase change material, and the nano-film-forming material with the porous steel slag in batches, adding them completely within 30 minutes. Then, stir evenly in a constant temperature magnetic stirrer for 6 hours. After thorough mixing, add the nano-reinforcing material and mix evenly to obtain the high-strength phase change carbon-fixing steel slag for water-stabilized base layer.

6. The method for preparing high-strength phase transformation carbon-fixed steel slag for water-stabilized base courses according to claim 5, characterized in that: In step S3, the nanofilm-forming material comprises 25-35 parts by weight of epoxy asphalt and 10-20 parts by weight of spherical nanocellulose.

7. The method for preparing high-strength phase transformation carbon-fixing steel slag for water-stabilized base courses according to claim 6, characterized in that: The preparation method of the epoxy asphalt includes the following steps: Step A1: Melt 30 parts by weight of base asphalt at 150°C and place it in a beaker. Add 5-20 parts by weight of epoxy asphalt compatibilizer, 10-20 parts by weight of sebacic acid, 10-20 parts by weight of polysaccharide, and 10-20 parts by weight of methyltetraaminophthalic anhydride in batches. Stir thoroughly at 15°C for 1 hour to obtain epoxy asphalt component A. Step A2: Mix the epoxy asphalt component A with epoxy resin and place it in an electric thermostatic drying oven. Heat it to 150°C until it is completely melted into a homogeneous fluid. Remove it and place it in a beaker. Mix and stir evenly. Pour it into a PTFE mold and cure it sequentially at 155°C for 8 hours, 125°C for 12 hours, and 175°C for 8 hours. Remove it and cool it at room temperature to obtain the epoxy asphalt.

8. The method for preparing high-strength phase transformation carbon-fixing steel slag for water-stabilized base courses according to claim 6, characterized in that: The preparation method of the spherical nanocellulose is as follows: cellulose is thoroughly mixed with a NaOH solution of 5%-15% by mass at a mass ratio of 1:40-1:60, chlorine gas is introduced, the pH value of the system is maintained at 6-8, and after 12-24 hours, the spherical nanocellulose with a diameter of 20-60 nm prepared by oxidation process can be obtained.

Images