Wear-resistant recycled asphalt concrete and preparation process thereof

Abstract

The invention discloses wear-resistant recycled asphalt concrete which is prepared from the following materials in parts: 20-100 parts of recycled asphalt, 60-300 parts of new asphalt, 40-200 parts of aggregate, 1-5 parts of fiber filler, 1-3 parts of an asphalt stabilizer, 6-30 parts of mineral powder, 1-3 parts of an antifreeze agent, 1-3 parts of an antioxidant, 2-10 parts of a regenerant and 6-20 parts of carbon black. According to the invention, the aging of the wear-resistant recycled asphalt concrete due to intermittent friction heat generated between the wear-resistant recycled asphalt concrete and wheels is avoided, the ultraviolet aging resistance of the wear-resistant recycled asphalt concrete is improved, and the temperature resistance and corrosion resistance of the glass fibers and the polypropylene fibers are relatively good; the wear-resistant recycled asphalt concrete has a good matching effect during mixed use, so that the overall quality of the wear-resistant recycled asphalt concrete is greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of asphalt concrete, and specifically relates to a wear-resistant recycled asphalt concrete and its preparation process. Background Art

[0002] Asphalt concrete is a commonly used road construction material, usually composed of asphalt, crushed stone, sand, mineral powder, etc. mixed in a certain proportion, and heated, stirred, paved and compacted under specific conditions. Asphalt concrete has good bearing capacity and compressive performance. Asphalt concrete is widely used in road engineering, such as the ground paving of highways, urban roads, expressways, airport runways, parking lots, docks, squares and other places. In addition, asphalt concrete can also be used for non-road facilities, such as the ground of industrial and commercial places. In short, asphalt concrete, as a high-quality pavement material, plays an important role in highway construction. In the prior art, general asphalt concrete has poor wear resistance. After being rolled by trucks, there are potholes on the road surface, and people need to regularly maintain the asphalt concrete, which is time-consuming and laborious. For this reason, we have proposed a wear-resistant recycled asphalt concrete and its preparation process. Summary of the Invention

[0003] The purpose of the present invention is to provide a wear-resistant recycled asphalt concrete and its preparation process to solve the problems raised in the above background art.

[0004] To achieve the above purpose, the present invention provides the following technical solution: A wear-resistant recycled asphalt concrete, which is prepared from the following parts of materials: 20 - 100 parts of recycled asphalt, 60 - 300 parts of new asphalt, 40 - 200 parts of aggregate, 1 - 5 parts of fiber filler, 1 - 3 parts of asphalt stabilizer, 6 - 30 parts of mineral powder, 1 - 3 parts of antifreeze, 1 - 3 parts of antioxidant, 2 - 10 parts of regenerant, and 6 - 20 parts of carbon black.

[0005] In the above solution, the new asphalt is one of coal tar asphalt, petroleum asphalt and natural asphalt.

[0006] In the above solution, the aggregate includes limestone and steel slag powder, and the weight ratio of limestone to steel slag powder is 1:0.2.

[0007] In the above solution, the limestone is a combination of limestone with particle size ranges of (0 - 3)mm, (3 - 5)mm, (5 - 15)mm and (15 - 20)mm, and its weight ratio is 1:(0.8 - 1.2):(0.8 - 1.2), and the particle size of the steel slag powder is 4 - 6m.

[0008] In the above solution, the fiber is one or more of polyester fiber, lignin fiber, glass fiber, brucite fiber and polypropylene fiber.

[0009] In the above solution, the asphalt stabilizer is one or more of polyethylene wax, oxidized polyethylene wax, and acrylic acid modified polyethylene wax.

[0010] In the above solution, the mineral powder is one or more of wollastonite powder, coal gangue powder, steel slag powder, expanded perlite powder, and phosphate ore powder.

[0011] In the above solution, it includes one or more of palm oil, pine tar, tall oil, and rosin resin.

[0012] A preparation process of wear-resistant recycled asphalt concrete includes the following steps: Step S1, preparing materials: 20 - 100 parts of recycled asphalt, 60 - 300 parts of new asphalt, 40 - 200 parts of aggregate, 1 - 5 parts of fiber filler, 1 - 3 parts of asphalt stabilizer, 6 - 30 parts of mineral powder, 1 - 3 parts of antifreeze, 1 - 3 parts of antioxidant, 2 - 10 parts of regenerant, and 6 - 20 parts of carbon black; Step S2, waste cleaning: crushing and sieving the recycled asphalt blocks. Step S3, preparing asphalt mixture: stirring 20 - 100 parts of heated recycled asphalt, 60 - 300 parts of new asphalt, and 40 - 200 parts of aggregate to make them fully mixed to form an asphalt mixture. Step S4, preparing additive mixture: adding 1 - 5 parts of fiber filler, 1 - 3 parts of asphalt stabilizer, 6 - 30 parts of mineral powder, 1 - 3 parts of antifreeze, 1 - 3 parts of antioxidant, 2 - 10 parts of regenerant, and 6 - 20 parts of carbon black into the mixture prepared in S3 to obtain recycled asphalt concrete.

[0013] Compared with the prior art, the beneficial effects of the present invention are: there is good bonding between carbon black and each component, thus greatly reducing the internal pores of the wear-resistant recycled asphalt concrete, and carbon black has good heat resistance and light stability, which not only helps to avoid the aging of the wear-resistant recycled asphalt concrete due to the intermittent frictional heat generated between the wheels, but also helps to improve the ultraviolet aging resistance of the wear-resistant recycled asphalt concrete. The adsorption properties of polyester fiber, lignin fiber, and brucite fiber are better, and the heat resistance and corrosion resistance of glass fiber and polypropylene fiber are better. When they are used in combination, they can achieve good cooperation effects, thus greatly improving the overall quality of the wear-resistant recycled asphalt concrete. Description of the Drawings

[0014] Figure 1 It is a process step diagram of the present invention; Detailed Embodiments

[0015] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0016] A wear-resistant recycled asphalt concrete is prepared from the following parts by weight of materials: 20-100 parts of recycled asphalt, 60-300 parts of new asphalt, 40-200 parts of aggregate, 1-5 parts of fiber filler, 1-3 parts of asphalt stabilizer, 6-30 parts of mineral powder, 1-3 parts of antifreeze, 1-3 parts of antioxidant, 2-10 parts of regenerant, and 6-20 parts of carbon black. Carbon black is a light, loose and extremely fine black powder with a very large surface area. It is a good filler and has good bonding properties with each component, thereby greatly reducing the internal pores of the wear-resistant recycled asphalt concrete. Moreover, carbon black has good heat resistance and light stability, which is not only beneficial to avoiding the aging of the wear-resistant recycled asphalt concrete due to the intermittent frictional heat generated between the wheels, but also conducive to improving the ultraviolet aging resistance of the wear-resistant recycled asphalt concrete.

[0017] The new asphalt is one of coal tar asphalt, petroleum asphalt, and natural asphalt.

[0018] The aggregate includes limestone and steel slag powder, and the weight ratio of limestone to steel slag powder is 1:0.2.

[0019] The limestone is a combination of limestone with particle size ranges of (0-3) mm, (3-5) mm, (5-15) mm, and (15-20) mm, and the weight ratio is 1:(0.8-1.2):(0.8-1.2). The particle size of the steel slag powder is 4-6m.

[0020] The fiber is one or more of polyester fiber, lignin fiber, glass fiber, brucite fiber, and polypropylene fiber. Polyester fiber, lignin fiber, glass fiber, brucite fiber, and polypropylene fiber all have good structural strength, which is beneficial to improving the overall structural strength of the wear-resistant recycled asphalt concrete. At the same time, polyester fiber, lignin fiber, and brucite fiber have good adsorption properties, and glass fiber and polypropylene fiber have good heat resistance and corrosion resistance. When used in combination, they can achieve good cooperation effects, thereby greatly improving the overall quality of the wear-resistant recycled asphalt concrete.

[0021] The asphalt stabilizer is one or more of polyethylene wax, oxidized polyethylene wax, and acrylic acid-modified polyethylene wax.

[0022] The mineral powder is one or more of wollastonite mineral powder, coal gangue mineral powder, steel slag mineral powder, expanded perlite mineral powder, and phosphate ore powder.

[0023] The above includes one or more of palm oil, pine tar, tall oil, and rosin resin. Example

[0024] Step S1, preparing materials: 20 parts of recycled asphalt, 60 parts of new asphalt, 40 parts of aggregate, 1 part of fiber filler, 1 part of asphalt stabilizer, 6 parts of mineral powder, 1 part of antifreeze, 1 part of antioxidant, 2 parts of regenerant, and 6 parts of carbon black; Step S2, waste cleaning: crushing and sieving the recycled asphalt blocks; Step S3, preparing asphalt mixture: stirring 20 parts of heated recycled asphalt, 60 parts of new asphalt, and 40 parts of aggregate to make them fully mixed to form an asphalt mixture; Step S4, preparing additive mixture: adding 1 part of fiber filler, 1 part of asphalt stabilizer, 6 parts of mineral powder, 1 part of antifreeze, 1 part of antioxidant, 2 parts of regenerant, and 6 parts of carbon black into the mixture prepared in S3 to obtain recycled asphalt concrete. Example

[0025] Step S1, preparing materials: 60 parts of recycled asphalt, 180 parts of new asphalt, 120 parts of aggregate, 3 parts of fiber filler, 2 parts of asphalt stabilizer, 18 parts of mineral powder, 2 parts of antifreeze, 2 parts of antioxidant, 6 parts of regenerant, and 13 parts of carbon black; Step S2, waste cleaning: crushing and sieving the recycled asphalt blocks; Step S3, preparing asphalt mixture: stirring 60 parts of heated recycled asphalt, 180 parts of new asphalt, and 120 parts of aggregate to make them fully mixed to form an asphalt mixture; Step S4, preparing additive mixture: adding 3 parts of fiber filler, 2 parts of asphalt stabilizer, 18 parts of mineral powder, 2 parts of antifreeze, 2 parts of antioxidant, 6 parts of regenerant, and 13 parts of carbon black into the mixture prepared in S3 to obtain recycled asphalt concrete Example

[0026] Step S1, preparing materials: 100 parts of recycled asphalt, 300 parts of new asphalt, 200 parts of aggregate, 5 parts of fiber filler, 3 parts of asphalt stabilizer, 30 parts of mineral powder, 3 parts of antifreeze, 3 parts of antioxidant, 10 parts of regenerant, and 20 parts of carbon black; Step S2, waste cleaning: crushing and sieving the recycled asphalt blocks; Step S3, preparing asphalt mixture: stirring 100 parts of heated recycled asphalt, 300 parts of new asphalt, and 200 parts of aggregate to make them fully mixed to form an asphalt mixture; Step S4, preparation of additive mixture: Add 5 parts of fiber filler, 3 parts of asphalt stabilizer, 30 parts of mineral powder, 3 parts of antifreeze, 3 parts of antioxidant, 10 parts of regenerant and 20 parts of carbon black into the mixture prepared in S3 to obtain recycled asphalt concrete.

[0027] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A wear-resistant recycled asphalt concrete, characterized in that: The concrete is prepared from the following materials: 20-100 parts of recycled asphalt, 60-300 parts of new asphalt, 40-200 parts of aggregate, 1-5 parts of fiber filler, 1-3 parts of asphalt stabilizer, 6-30 parts of mineral powder, 1-3 parts of antifreeze agent, 1-3 parts of antioxidant, 2-10 parts of regeneration agent and 6-20 parts of carbon black.

2. The wear-resistant recycled asphalt concrete according to claim 1, characterized in that: The new asphalt is one of coal tar asphalt, petroleum asphalt and natural asphalt.

3. The wear-resistant recycled asphalt concrete according to claim 1, characterized in that: The aggregate includes limestone and steel slag powder, and the weight ratio of the limestone to the steel slag powder is 1:0.

2.

4. The wear-resistant recycled asphalt concrete according to claim 3, characterized in that: The limestone is a combination of limestones with particle sizes ranging from (0-3) mm, (3-5) mm, (5-15) mm and (15-20) mm, with a weight ratio of 1: (0.8-1.2): (0.8-1.2), and the particle size of the steel slag powder is 4-6m.

5. The wear-resistant recycled asphalt concrete according to claim 3, characterized in that: The fiber is one or more of polyester fiber, lignin fiber, glass fiber, brucite fiber and polypropylene fiber.

6. The wear-resistant recycled asphalt concrete according to claim 3, characterized in that: The asphalt stabilizer is one or more of polyethylene wax, oxidized polyethylene wax, and acrylic acid-modified polyethylene wax.

7. The wear-resistant recycled asphalt concrete according to claim 3, characterized in that: The mineral powder is one or more of wollastonite mineral powder, coal gangue mineral powder, steel slag mineral powder, expanded perlite mineral powder and phosphate rock powder.

8. The wear-resistant recycled asphalt concrete according to claim 3, characterized in that: The regeneration agent is one or more of palm oil, pine tar, tall oil and rosin resin.

9. A process for preparing wear-resistant recycled asphalt concrete, characterized in that: The steps include: Step S1, preparing materials: 20-100 parts of recycled asphalt, 60-300 parts of new asphalt, 40-200 parts of aggregate, 1-5 parts of fiber filler, 1-3 parts of asphalt stabilizer, 6-30 parts of mineral powder, 1-3 parts of antifreeze agent, 1-3 parts of antioxidant, 2-10 parts of regeneration agent and 6-20 parts of carbon black; Step S2, waste cleaning: crushing and sieving the recycled asphalt blocks; Step S3, asphalt mixture preparation: 20-100 parts of heated recycled asphalt, 60-300 parts of new asphalt, and 40-200 parts of aggregate are stirred to fully mix to form an asphalt mixture; Step S4, preparation of additive mixture: add 1-5 parts of fiber filler, 1-3 parts of asphalt stabilizer, 6-30 parts of mineral powder, 1-3 parts of antifreeze agent, 1-3 parts of antioxidant, 2-10 parts of regeneration agent and 6-20 parts of carbon black to the mixture prepared in S3 to obtain recycled asphalt concrete.

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