Process for preparing high-wear-resistance pavement material from steel slag and waste asphalt pavement material

Abstract

The invention discloses a process for preparing a high-wear-resistance pavement material by using steel slag and a waste asphalt pavement material, which comprises the following steps: S1, dissolving a silane coupling agent in ethanol to form a modified liquid, then adding waste rubber powder into the modified liquid, uniformly stirring, standing, separating out the waste rubber powder, and drying to obtain the high-wear-resistance pavement material. Then adding the mixture into saturated lime water, heating and preserving heat, separating out solids after heating and preserving heat, and drying to obtain the modified rubber powder. And S2, crushing the waste asphalt pavement material, heating until asphalt components in the waste asphalt pavement material are molten, adding the steel slag coarse aggregate, the gravel fine aggregate and the mineral powder, uniformly stirring, adding the pavement asphalt, the modified fiber and the modified rubber powder, continuously heating to melt the asphalt, and uniformly mixing to obtain the pavement material. And the asphalt pavement is paved on a roadbed to form a high-wear-resistance asphalt pavement. According to the invention, not only is the resource utilization problem of the steel slag and the waste asphalt pavement material solved, but also the wear resistance of the prepared pavement material is improved, and the service life is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of asphalt pavement material preparation, in particular to a process for preparing high-wear-resistant pavement material by utilizing steel slag and waste asphalt pavement material. Background Art

[0002] Asphalt pavement is a road surface constructed by blending road asphalt with mineral materials (including coarse and fine aggregates, mineral powder, etc.). Over the course of service, the asphalt component gradually ages and wears away. Once this wear reaches a certain point, it must be removed and replaced to ensure road safety. The removal of these asphalt pavements generates a large amount of waste. If not processed and utilized, this waste results in a waste of resources. Therefore, recycling waste asphalt pavement materials not only helps recycle solid waste but also reduces environmental pollution. However, traditional utilization methods primarily involve landfilling as roadbed material, but this approach has significant drawbacks, such as limited utilization and potential groundwater pollution. Steel slag is an industrial solid waste generated during the steelmaking process. my country produces hundreds of millions of tons of steel slag annually, and combined with existing stockpiles, its utilization presents a significant challenge. While many researchers have explored grinding steel slag into a raw material for cement clinker production, its poor grindability results in high energy consumption, limiting its utilization. Summary of the Invention

[0003] The present invention discloses a process for producing highly wear-resistant pavement materials using steel slag and waste asphalt pavement materials. This process not only solves the resource utilization problem of steel slag and waste asphalt pavement materials, but also improves the wear resistance and service life of the produced pavement materials. To achieve the above objectives, the present invention discloses the following technical solutions.

[0004] A process for preparing a highly wear-resistant pavement material using steel slag and waste asphalt pavement material comprises the following steps: S1. Dissolve a silane coupling agent in ethanol to form a modified solution, then add waste rubber powder to the modified solution, stir evenly, and let it stand. After completion, separate the waste rubber powder and dry it. Then, add it to saturated lime water and heat it to keep it warm. After completion, separate the solid matter, dry it, and obtain modified rubber powder for standby use.

[0005] S2. treating the basalt fiber in an alkali solution, separating the fiber and drying it in the air to obtain the modified fiber.

[0006] S3. Crushing the waste asphalt pavement material and heating it until the asphalt component therein is melted, then adding steel slag coarse aggregate, sand and gravel fine aggregate, and mineral powder and stirring evenly, then adding road asphalt, the modified fiber, and the modified rubber powder and continuing to heat to melt the road asphalt. After mixing evenly, the pavement material is obtained, which is paved on the roadbed to form a highly wear-resistant asphalt pavement.

[0007] Furthermore, in step S1, the mass fraction of the silane coupling agent in the modified solution is 1.5-2.5%. Optionally, the silane coupling agent includes any one of KH550, KH560, KH570, A151, A171, A172, etc.

[0008] Furthermore, in step S1, the ratio of the waste rubber powder to the modified liquid is 1g: 10-30ml. Optionally, the fineness of the waste rubber powder is 80-200 mesh.

[0009] Furthermore, in step S1, the standing time is 30-50 minutes. Optionally, the drying temperature is 60-80°C and the drying time is 5-10 minutes.

[0010] Furthermore, in step S1, the ratio of the waste rubber powder to saturated lime water is 1g: 10-20ml. Optionally, the heating and heat preservation temperature is 45-60°C and the time is 2-3 hours.

[0011] Furthermore, in step S1, the solid matter is dried at a temperature of 60-70° C. for 20-30 minutes.

[0012] Furthermore, in step S2, the ratio of the basalt fiber to the alkali solution is 1 g: 20-40 ml. Optionally, the concentration of the alkali solution is 2-5 mol / L, and the length of the basalt fiber is 1-5 cm.

[0013] Furthermore, in step S2, the alkaline solution includes at least one of a sodium hydroxide solution, a potassium hydroxide solution, etc. Optionally, the treatment time is 60 to 90 minutes.

[0014] Furthermore, in step S3, the ratio of the waste asphalt pavement material, steel slag coarse aggregate, sand and gravel fine aggregate, mineral powder, road asphalt, modified fiber, and modified rubber powder is 215-260 parts by weight: 190-230 parts by weight: 300-345 parts by weight: 55-70 parts by weight: 80-105 parts by weight: 30-40 parts by weight: 50-65 parts by weight.

[0015] Compared with the prior art, the present invention has at least the following beneficial effects: The present invention uses waste asphalt pavement material as raw material, heats it, and then adds steel slag coarse aggregate to re-prepare the asphalt pavement material. This not only achieves resource utilization of both solid wastes, but also is simple and efficient, eliminating the need for grinding steel slag or complex processing of waste asphalt pavement material. Furthermore, the asphalt in the waste asphalt pavement material can be reused, reducing asphalt usage. Furthermore, coating the steel slag coarse aggregate with asphalt effectively avoids the problem of poor volume stability of the steel slag, preventing cracking in the pavement material during service due to volume expansion of the steel slag coarse aggregate upon contact with water. Furthermore, the excellent wear resistance of the steel slag ensures that the prepared pavement material also possesses excellent wear resistance.

[0016] Furthermore, the pavement material of this application also incorporates modified fibers and modified rubber powder, effectively improving the wear resistance of the pavement material. This is because after treating the basalt fiber with alkaline solution, the silicon-oxygen tetrahedrons on its surface depolymerize to form -Si(OH)3. The silane groups on the surface of the modified rubber powder, which hydrolyze to form silanol groups (-Si(OH)3), react with the -Si(OH)3 on the surface of the modified fiber to form -Si-O-Si- bonds, thereby bonding the modified fiber to the rubber particles and enhancing the bonding between the rubber particles and the pavement material. Furthermore, the entanglement of the modified fibers within the pavement material matrix effectively enhances the bonding between the various components, reducing flaking of the pavement material under friction, thereby improving the wear resistance of the pavement material. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings, which constitute part of the present invention, are intended to provide a further understanding of the present invention and are not intended to limit the present invention. The following describes the embodiments of the present invention in detail with reference to the accompanying drawings, wherein: Figure 1 This is a diagram of a modified rubber powder sample prepared in Example 1 below.

[0018] Figure 2 This is a diagram of a modified fiber sample prepared in Example 1 below. DETAILED DESCRIPTION

[0019] The present invention will be further described below with reference to specific examples. It should be understood that these examples are intended only to illustrate the present invention and are not intended to limit the scope of the present invention. The present invention will now be further described with reference to the accompanying drawings and specific embodiments.

[0020] Example 1 A process for preparing a highly wear-resistant pavement material using steel slag and waste asphalt pavement material comprises the following steps: S1. Dissolve silane coupling agent KH560 in anhydrous ethanol to form a modification solution with a mass fraction of 2%. Then, mix 150-mesh waste rubber powder and the modification solution at a ratio of 1g:25ml and stir evenly. Then, let it stand for 40 minutes. After completion, filter out the waste rubber powder and place it in an oven at 60°C to dry for 10 minutes. Then, mix the obtained rubber powder with saturated lime water at a ratio of 1g:20ml and heat it to 45°C for 3 hours. After completion, filter out the solid matter and place it in an oven at 60°C to dry for 30 minutes to obtain modified rubber powder (such as Figure 1 as shown), and keep it as a standby.

[0021] S2, basalt fiber with a length of 2.5 cm and 3 mol / L sodium hydroxide solution were mixed at a ratio of 1 g: 35 ml and stirred evenly, and then allowed to stand for 70 minutes. After completion, the fiber was filtered out and dried to obtain the modified fiber (such as Figure 2 shown).

[0022] S3. Take the following raw materials: 224 parts by weight of waste asphalt pavement material, 207 parts by weight of steel slag coarse aggregate with a particle size distribution between 0.8 and 1.5 cm, 310 parts by weight of sand and gravel fine aggregate with a particle size distribution between 0.5 and 1.5 mm, 65 parts by weight of mineral powder, 89 parts by weight of road asphalt, 36 parts by weight of modified fiber, and 57 parts by weight of modified rubber powder.

[0023] S4. Crushing the waste asphalt pavement material, heating it to 110° C. and keeping it warm for 20 minutes to melt the asphalt component therein, then adding the steel slag coarse aggregate, sand and gravel fine aggregate, and mineral powder and stirring them evenly, then adding the road asphalt, the modified fiber, and the modified rubber powder, continuing to heat it to 110° C. and keeping it warm for 20 minutes, while stirring to mix all the raw materials evenly, to obtain the pavement material.

[0024] Performance Testing: The pavement material prepared in this example was poured into a mold to prepare test specimens. The specimens were then tested for wear resistance using an abrasion tester. The wear resistance was calculated as X = (M1 - M2) / M1. M1 is the initial mass of the specimen, and M2 is the mass of the specimen after the wear resistance test. Furthermore, the compressive strength of the pavement material prepared in this example was tested, yielding the following results: X = 96.27%, and compressive strength = 18.04 MPa.

[0025] Example 2 A process for preparing a highly wear-resistant pavement material using steel slag and waste asphalt pavement material comprises the following steps: S1. Dissolve silane coupling agent KH550 in anhydrous ethanol to form a 1.5% modification solution. Then, mix 200-mesh waste rubber powder with the modification solution at a ratio of 1 g:30 ml and stir evenly. Then, let it stand for 50 minutes. After completion, filter out the waste rubber powder and dry it in an oven at 70°C for 10 minutes. Then, mix the resulting rubber powder with saturated lime water at a ratio of 1 g:15 ml and heat to 60°C for 2 hours. After completion, filter out the solid matter and dry it in an oven at 70°C for 20 minutes to obtain modified rubber powder for later use.

[0026] S2. Mix 1 cm long basalt fiber with 3 mol / L sodium hydroxide solution at a ratio of 1 g: 20 ml, stir evenly, and let stand for 60 minutes. After completion, filter out the fiber and dry it to obtain the modified fiber.

[0027] S3. Take the following raw materials: 215 parts by weight of waste asphalt pavement material, 230 parts by weight of steel slag coarse aggregate with a particle size distribution between 0.8 and 1.5 cm, 300 parts by weight of sand and gravel fine aggregate with a particle size distribution between 0.5 and 1.5 mm, 55 parts by weight of mineral powder, 80 parts by weight of road asphalt, 30 parts by weight of modified fiber, and 50 parts by weight of modified rubber powder.

[0028] S4. Crushing the waste asphalt pavement material, heating it to 110° C. and keeping it warm for 20 minutes to melt the asphalt component therein, then adding the steel slag coarse aggregate, sand and gravel fine aggregate, and mineral powder and stirring them evenly, then adding the road asphalt, the modified fiber, and the modified rubber powder, continuing to heat it to 110° C. and keeping it warm for 20 minutes, while stirring to mix all the raw materials evenly, to obtain the pavement material.

[0029] Performance test: The wear resistance and compressive strength of the pavement material prepared in this embodiment were tested by the same method as in the above embodiment 1. The results are as follows: X=93.82%, compressive strength=17.39 MPa.

[0030] Example 3 A process for preparing a highly wear-resistant pavement material using steel slag and waste asphalt pavement material comprises the following steps: S1. Dissolve silane coupling agent KH560 in anhydrous ethanol to form a 2.5% modification solution. Then, mix 80-mesh waste rubber powder with the modification solution at a ratio of 1 g:10 ml and stir evenly. Then, let the mixture stand for 30 minutes. Afterwards, filter out the waste rubber powder and dry it in an oven at 80°C for 5 minutes. Then, mix the resulting rubber powder with saturated lime water at a ratio of 1 g:10 ml and heat to 55°C for 3 hours. Afterwards, filter out the solid matter and dry it in an oven at 70°C for 20 minutes to obtain modified rubber powder for later use.

[0031] S2. Mix 5 cm long basalt fiber with 2 mol / L sodium hydroxide solution at a ratio of 1 g:40 ml, stir evenly, and let stand for 90 minutes. After completion, filter out the fiber and dry it in the air to obtain the modified fiber.

[0032] S3. Take the following raw materials: 260 parts by weight of waste asphalt pavement material, 190 parts by weight of steel slag coarse aggregate with a particle size distribution between 0.8 and 1.5 cm, 345 parts by weight of sand and gravel fine aggregate with a particle size distribution between 0.5 and 1.5 mm, 70 parts by weight of mineral powder, 105 parts by weight of road asphalt, 40 parts by weight of modified fiber, and 65 parts by weight of modified rubber powder.

[0033] S4. Crushing the waste asphalt pavement material, heating it to 110° C. and keeping it warm for 20 minutes to melt the asphalt component therein, then adding the steel slag coarse aggregate, sand and gravel fine aggregate, and mineral powder and stirring them evenly, then adding the road asphalt, the modified fiber, and the modified rubber powder, continuing to heat it to 110° C. and keeping it warm for 25 minutes, while stirring to mix all the raw materials evenly, to obtain the pavement material.

[0034] Performance test: The wear resistance and compressive strength of the pavement material prepared in this embodiment were tested by the same method as in the above embodiment 1. The results were as follows: X = 95.11%, compressive strength = 18.46 MPa.

[0035] Example 4 A process for preparing a highly wear-resistant pavement material using steel slag and waste asphalt pavement material comprises the following steps: S1. Dissolve silane coupling agent KH560 in anhydrous ethanol to form a 2% modification solution. Then, mix 150-mesh waste rubber powder with the modification solution at a ratio of 1 g:25 ml and stir evenly. Then, let the mixture stand for 40 minutes. Afterwards, filter out the waste rubber powder and dry it in an oven at 60°C for 10 minutes. Then, mix the resulting rubber powder with saturated lime water at a ratio of 1 g:20 ml and heat to 45°C for 3 hours. Afterwards, filter out the solid matter and dry it in an oven at 60°C for 30 minutes to obtain modified rubber powder for later use.

[0036] S2. Take the following raw materials: 224 parts by weight of waste asphalt pavement material, 207 parts by weight of steel slag coarse aggregate with a particle size distribution between 0.8 and 1.5 cm, 310 parts by weight of sand and gravel fine aggregate with a particle size distribution between 0.5 and 1.5 mm, 65 parts by weight of mineral powder, 89 parts by weight of road asphalt, 36 parts by weight of basalt fiber with a length of 2.5 cm, and 57 parts by weight of modified rubber powder.

[0037] S3. Crushing the waste asphalt pavement material, heating it to 110° C. and keeping it warm for 20 minutes to melt the asphalt component therein, then adding the steel slag coarse aggregate, sand and gravel fine aggregate, and mineral powder and stirring them evenly, then adding the road asphalt, the basalt fiber, and the modified rubber powder, continuing to heat it to 110° C. and keeping it warm for 20 minutes, while stirring to mix all the raw materials evenly, to obtain the pavement material.

[0038] Performance test: The wear resistance and compressive strength of the pavement material prepared in this embodiment were tested by the same method as in the above embodiment 1. The results are as follows: X=84.63%, compressive strength=18.04 MPa.

[0039] Example 5 A process for preparing a highly wear-resistant pavement material using steel slag and waste asphalt pavement material comprises the following steps: S1. Mix 1 cm long basalt fiber with 3 mol / L sodium hydroxide solution at a ratio of 1 g: 20 ml, stir evenly, and let stand for 60 minutes. After completion, filter out the fiber and dry it to obtain the modified fiber.

[0040] S2. Take the following raw materials: 215 parts by weight of waste asphalt pavement material, 230 parts by weight of steel slag coarse aggregate with a particle size distribution between 0.8 and 1.5 cm, 300 parts by weight of sand and gravel fine aggregate with a particle size distribution between 0.5 and 1.5 mm, 55 parts by weight of mineral powder, 80 parts by weight of road asphalt, 30 parts by weight of modified fiber, and 50 parts by weight of waste rubber powder with a fineness of 200 mesh.

[0041] S3. Crushing the waste asphalt pavement material, heating it to 110° C. and keeping it warm for 20 minutes to melt the asphalt component therein, then adding the steel slag coarse aggregate, sand and gravel fine aggregate, and mineral powder and stirring them evenly, then adding the road asphalt, the modified fiber, and the waste rubber powder, continuing to heat it to 110° C. and keeping it warm for 20 minutes, while stirring to mix all the raw materials evenly, to obtain the pavement material.

[0042] Performance test: The wear resistance and compressive strength of the pavement material prepared in this embodiment were tested by the same method as in the above embodiment 1. The results are as follows: X=80.06%, compressive strength=16.77 MPa.

[0043] Example 6 A process for preparing a highly wear-resistant pavement material using steel slag and waste asphalt pavement material comprises the following steps: S1. Dissolve silane coupling agent KH560 in anhydrous ethanol to form a modified liquid with a mass fraction of 2.5%, then mix 80-mesh waste rubber powder and the modified liquid in a ratio of 1 g:10 ml and stir evenly, then let it stand for 30 minutes. After completion, filter out the waste rubber powder, place it in an oven at 80°C and dry it for 5 minutes to obtain modified rubber powder for later use.

[0044] S2. Mix 5 cm long basalt fiber with 2 mol / L sodium hydroxide solution at a ratio of 1 g:40 ml, stir evenly, and let stand for 90 minutes. After completion, filter out the fiber and dry it in the air to obtain the modified fiber.

[0045] S3. Take the following raw materials: 260 parts by weight of waste asphalt pavement material, 190 parts by weight of steel slag coarse aggregate with a particle size distribution between 0.8 and 1.5 cm, 345 parts by weight of sand and gravel fine aggregate with a particle size distribution between 0.5 and 1.5 mm, 70 parts by weight of mineral powder, 105 parts by weight of road asphalt, 40 parts by weight of modified fiber, and 65 parts by weight of modified rubber powder.

[0046] S4. Crushing the waste asphalt pavement material, heating it to 110° C. and keeping it warm for 20 minutes to melt the asphalt component therein, then adding the steel slag coarse aggregate, sand and gravel fine aggregate, and mineral powder and stirring them evenly, then adding the road asphalt, the modified fiber, and the modified rubber powder, continuing to heat it to 110° C. and keeping it warm for 25 minutes, while stirring to mix all the raw materials evenly, to obtain the pavement material.

[0047] Performance test: The wear resistance and compressive strength of the pavement material prepared in this embodiment were tested by the same method as in the above embodiment 1. The results are as follows: X=86.41%, compressive strength=17.13 MPa.

[0048] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A process for preparing high-wear-resistant pavement materials using steel slag and waste asphalt pavement materials, characterized in that: The steps include: S1, dissolving a silane coupling agent in ethanol to form a modified solution, then adding waste rubber powder to the modified solution and stirring evenly and then standing, separating the waste rubber powder after completion and drying, then adding it to saturated lime water and heating and heat preservation, separating the solid matter after completion, and obtaining modified rubber powder after drying for standby use; S2, treating the basalt fiber in an alkali solution, then separating the fiber and drying it to obtain a modified fiber; S3. Crushing the waste asphalt pavement material and heating it until the asphalt component therein is melted, then adding steel slag coarse aggregate, sand and gravel fine aggregate, and mineral powder and stirring evenly, then adding road asphalt, the modified fiber, and the modified rubber powder and continuing to heat to melt the road asphalt. After mixing evenly, the pavement material is obtained, which is paved on the roadbed to form a highly wear-resistant asphalt pavement.

2. The process for preparing a highly wear-resistant pavement material according to claim 1, wherein: In step S1, the mass fraction of the silane coupling agent in the modified solution is 1.5-2.5%; optionally, the silane coupling agent includes any one of KH550, KH560, KH570, A151, A171, and A172.

3. The process for preparing a highly wear-resistant pavement material according to claim 1, wherein: In step S1, the ratio of the waste rubber powder to the modified liquid is 1g:10-30ml; optionally, the fineness of the waste rubber powder is 80-200 mesh.

4. The process for preparing a highly wear-resistant pavement material according to claim 1, wherein: In step S1, the standing time is 30-50 minutes; optionally, the drying temperature is 60-80° C., and the drying time is 5-10 minutes.

5. The process for preparing a highly wear-resistant pavement material according to claim 1, wherein: In step S1, the ratio of the waste rubber powder to saturated lime water is 1g:10-20ml; optionally, the heating and insulation temperature is 45-60°C, and the time is 2-3 hours.

6. The process for preparing a highly wear-resistant pavement material according to claim 1, characterized in that: In step S1, the solid matter is dried at a temperature of 60-70° C. for 20-30 minutes.

7. The process for preparing a highly wear-resistant pavement material according to claim 1, characterized in that: In step S2, the ratio of the basalt fiber to the alkali solution is 1 g: 20-40 ml; optionally, the concentration of the alkali solution is 2-5 mol / L; optionally, the length of the basalt fiber is 1-5 cm.

8. The process for preparing a highly wear-resistant pavement material according to claim 1, wherein: In step S2, the alkaline solution includes at least one of a sodium hydroxide solution and a potassium hydroxide solution.

9. The process for preparing a highly wear-resistant pavement material according to claim 1, wherein: In step S2, the processing time is 60 to 90 minutes.

10. The process for preparing a highly wear-resistant pavement material according to any one of claims 1 to 9, characterized in that: In step S3, the ratio of the waste asphalt pavement material, steel slag coarse aggregate, sand and gravel fine aggregate, mineral powder, road asphalt, modified fiber, and modified rubber powder is 215-260 parts by weight: 190-230 parts by weight: 300-345 parts by weight: 55-70 parts by weight: 80-105 parts by weight: 30-40 parts by weight: 50-65 parts by weight.

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