Durable high-modulus asphalt mixture pavement structure

Abstract

The utility model discloses a durable high-modulus asphalt mixture pavement structure which comprises the following layered structures: an upper surface layer: high-modulus asphalt mixture with the thickness of 3-5cm; the middle layer is modified asphalt concrete with the thickness of 6-8 cm; the lower surface layer is high-modulus asphalt stabilized macadam with the thickness of 8-10 cm; the base layer is made of cement stabilized macadam with the thickness of 15-20 cm; the subbase layer is graded broken stone, the thickness is 20-25 cm, by arranging the high-modulus upper surface layer, the transition middle layer and the rigid lower surface layer, mechanical property gradient distribution is formed, load stress is dispersed, and regenerated rubber powder and synthetic resin are adopted for compounding a modifier, so that the high and low temperature performance is balanced. The utility model belongs to the field of road engineering materials, and particularly relates to a durable high-modulus asphalt mixture pavement structure.

Description

Technical Field

[0001] This utility model belongs to the field of road engineering materials, specifically referring to a durable high-modulus asphalt mixture pavement structure. Background Technology

[0002] Currently, in highway construction, modified asphalt or various reinforcing materials are commonly used to improve the performance of traditional asphalt concrete in order to enhance pavement durability and driving comfort. However, with the growth of traffic demand and vehicle loads, ordinary asphalt mixtures are gradually showing signs of insufficient load-bearing capacity, especially prone to flow deformation at high temperatures and cracking at low temperatures, seriously affecting the service life and quality of the pavement.

[0003] Traditional asphalt pavements are prone to rutting, cracking, and fatigue failure under high traffic volume and heavy vehicle loads, leading to shortened maintenance cycles. Existing high-modulus asphalt mixtures lack sufficient fatigue resistance. While CN219908428U describes a full-thickness, long-life asphalt pavement structure based on high-modulus asphalt mixtures using a multi-layer composite structure, it does not address the problem of insufficient interlayer adhesion. Utility Model Content

[0004] The technical problems to be solved by this invention are insufficient fatigue resistance and insufficient interlayer adhesion of asphalt pavement.

[0005] To solve the above problems, the technical solution adopted by this utility model is as follows: The durable high-modulus asphalt mixture pavement structure proposed by this utility model includes a top layer, an intermediate layer, a bottom layer, a base layer, and a subbase layer. The subbase layer, base layer, bottom layer, intermediate layer, and top layer are mixed, laid, compacted, and fixed together in sequence from bottom to top. The top layer is composed of high-modulus asphalt mixture with a thickness of 3-5cm; the intermediate layer is composed of modified asphalt concrete with a thickness of 6-8cm; the bottom layer is composed of high-modulus asphalt stabilized crushed stone with a thickness of 8-10cm; the base layer is composed of cement stabilized crushed stone with a thickness of 15-20cm; and the subbase layer is composed of graded crushed stone with a thickness of 20-25cm.

[0006] Further, the high-modulus asphalt mixture in the upper layer comprises the following components by weight percentage: continuously graded coarse aggregate (particle size 4.75-19mm): 45-60wt%; fine aggregate (particle size 0.075-4.75mm): 28-37wt%; mineral powder (particle size ≤0.075mm): 4.5-9wt%; recycled rubber powder (particle size ≤0.5mm): ≤3wt%; special cement (grade 42.5): 1.5-3wt%; water-reducing agent: 0.1-0.3wt%; waterproofing agent: 0.1-0.2wt%; coupling agent: 0.1-0.2wt%; polyacrylamide toughening agent: 0.1-0.3wt%; and specially treated synthetic resin: 0.5-1wt%.

[0007] Furthermore, the recycled rubber powder is waste tire rubber powder, and its surface is modified with a silane coupling agent.

[0008] Furthermore, the special cement is sulfoaluminate cement, with an initial setting time of ≤30 minutes and a final setting time of ≤60 minutes.

[0009] Furthermore, the synthetic resin is an epoxy resin or a polyurethane resin, which is modified with nano-silica and has a particle size ≤100nm.

[0010] Further, the modified asphalt concrete of the intermediate layer comprises the following components by weight percentage: modified asphalt (penetration 50-700.1 mm): 5.0-6.5 wt%; coarse aggregate (particle size 9.5-26.5 mm): 55-65 wt%; fine aggregate (particle size 0.075-9.5 mm): 25-35 wt%; mineral powder: 2-4 wt%.

[0011] Furthermore, the lower layer of high-modulus asphalt-stabilized crushed stone comprises the following components by mass percentage: asphalt (penetration 40-600.1 mm): 3.5-4.5 wt%; crushed stone (particle size 19-37.5 mm): 90-95 wt%; mineral powder: 1-2 wt%.

[0012] Furthermore, the mixing temperature of the high-modulus asphalt mixture is 175-185℃, and the mixing time is 45-60 seconds.

[0013] The beneficial effects of this utility model by adopting the above structure are as follows:

[0014] 1. The durable high-modulus asphalt mixture pavement structure proposed in this scheme forms a gradient distribution of mechanical properties by setting a high-modulus top layer, a transition intermediate layer and a rigid bottom layer, thereby dispersing load stress.

[0015] 2. The durable high-modulus asphalt mixture pavement structure proposed in this scheme uses a compound modifier of recycled rubber powder and synthetic resin to balance high and low temperature performance.

[0016] 3. The durable high-modulus asphalt mixture pavement structure proposed in this scheme ensures interlayer bonding and density through temperature control and compaction process optimization. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the internal structure of this utility model.

[0018] Among them, 1. upper layer, 2. middle layer, 3. lower layer, 4. base layer, and 5. subbase layer.

[0019] The accompanying drawings are provided to further understand the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation thereof. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0021] like Figure 1 As shown, this utility model proposes a durable high-modulus asphalt mixture pavement structure, including a top layer, an intermediate layer, a bottom layer, a base layer, and a subbase layer. The subbase layer, base layer, bottom layer, intermediate layer, and top layer are mixed, laid, compacted, and fixed together from bottom to top. The top layer is composed of high-modulus asphalt mixture, the intermediate layer is composed of modified asphalt concrete, the bottom layer is composed of high-modulus asphalt stabilized crushed stone, the base layer is composed of cement stabilized crushed stone, and the subbase layer is composed of graded crushed stone.

[0022] The top layer of high-modulus asphalt mixture includes continuously graded coarse aggregate, fine aggregate, mineral powder, recycled rubber powder, special cement, water-reducing agent, waterproofing agent, coupling agent, polyacrylamide toughening agent, and specially treated synthetic resin. The recycled rubber powder is waste tire rubber powder, and its surface is modified with a silane coupling agent. The special cement is sulfoaluminate cement, and the synthetic resin is epoxy resin or polyurethane resin. The intermediate layer of modified asphalt concrete includes modified asphalt, coarse aggregate, fine aggregate, and mineral powder. The bottom layer of high-modulus asphalt-stabilized crushed stone includes asphalt, crushed stone, and mineral powder.

[0023] Example 1

[0024] The top layer is 4cm thick, the middle layer is 7cm thick, the bottom layer is 9cm thick, the base layer is 18cm thick, and the subbase layer is 22cm thick.

[0025] The top layer consists of 55 wt% coarse aggregate, 32 wt% fine aggregate, 7 wt% mineral powder, 2 wt% recycled rubber powder, 2 wt% special cement, 0.2 wt% water-reducing agent, 0.1 wt% waterproofing agent, 0.1 wt% coupling agent, 0.2 wt% toughening agent, and 0.8 wt% synthetic resin.

[0026] The intermediate layer consists of 6 wt% modified asphalt, 60 wt% coarse aggregate, 30 wt% fine aggregate, and 4 wt% mineral powder.

[0027] The lower layer consists of 4 wt% asphalt, 93 wt% crushed stone, and 2 wt% mineral powder;

[0028] The base layer consists of 5 wt% cement, 92 wt% crushed stone, and 5 wt% water;

[0029] The subbase consists of 96 wt% crushed stone and 4 wt% sand.

[0030] First, all kinds of raw materials are weighed according to a specific ratio and then fed into a mixer for uniform mixing. After that, they are transferred to the paving site, spread out and compacted to form the required road surface structure.

[0031] Subbase construction: The base is spread evenly using a paver with a loose paving coefficient of 1.25; compaction: initial compaction (static compaction once) → secondary compaction (vibratory compaction 4-6 times, speed 2-4 km / h) → final compaction (static compaction twice).

[0032] Base course construction: The unconfined compressive strength of cement-stabilized crushed stone after 7 days is ≥4.0MPa; compaction must be completed before the initial setting of cement after paving.

[0033] Lower layer construction: Lay asphalt, asphalt heating temperature is 155±5℃; final compaction temperature ≥110℃.

[0034] Intermediate layer construction: Lay asphalt with a softening point of ≥70℃; use a paver to spread it evenly with a paving temperature of 165±5℃.

[0035] Surface layer construction: Mix the materials contained in the surface layer. The mixing temperature of the high modulus asphalt mixture is 180±5℃. Compact it using a combination of rubber-tired rollers and steel-wheeled rollers.

[0036] By setting a high-modulus top layer, a transitional intermediate layer, and a rigid bottom layer, a gradient distribution of mechanical properties is formed to disperse load stress. Furthermore, through temperature control and compaction process optimization, interlayer bonding and density are ensured.

[0037] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A durable high modulus asphalt mixture pavement structure characterized by: The system comprises a top layer, an intermediate layer, a bottom layer, a base layer, and a subbase layer. The subbase layer, base layer, bottom layer, intermediate layer, and top layer are mixed, spread, compacted, and bonded together in sequence from bottom to top. The top layer consists of high-modulus asphalt mixture with a thickness of 3-5 cm; the intermediate layer consists of modified asphalt concrete with a thickness of 6-8 cm; the bottom layer consists of high-modulus asphalt-stabilized crushed stone with a thickness of 8-10 cm; the base layer consists of cement-stabilized crushed stone with a thickness of 15-20 cm; and the subbase layer consists of graded crushed stone with a thickness of 20-25 cm.

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