Composite modified asphalt mixture anti-aging pavement structure layer

Abstract

The utility model discloses a kind of composite modified asphalt mixture anti-aging pavement structure layer, gravel subbase is laid on foundation, the top of gravel subbase is poured with pouring layer, asphalt seal oil layer is laid on pouring layer, asphalt seal oil layer top is paved with asphalt bottom layer, waterproof layer is provided on the top of asphalt bottom layer, drainage layer is provided on the top of waterproof layer, the top of drainage layer is paved with asphalt top layer, wear layer is sprayed on the top of asphalt top layer, first asphalt interlayer fiber web is provided between waterproof layer and drainage layer, second asphalt interlayer fiber web is provided between drainage layer and asphalt top layer. The composite modified asphalt mixture anti-aging pavement structure layer provided by the utility model reduces the deterioration of rain, air, ultraviolet light on asphalt layer by setting multiple road layer structures, reduces the aging rate of asphalt pavement, greatly prolongs the service life of pavement.

Description

Technical Field

[0001] This utility model relates to the field of asphalt pavement construction technology, and in particular to the anti-aging pavement structural layer of composite modified asphalt mixture. Background Technology

[0002] Asphalt pavement is a type of road structure formed by paving and compacting asphalt concrete. Asphalt concrete is a mixture of asphalt material with a specific viscosity and appropriate amount as a binder, thoroughly mixed with appropriately graded mineral aggregates. As the core material of the pavement, asphalt concrete must not only withstand the repeated impact of vehicle loads throughout its service life, but also resist the effects of environmental factors such as sunlight, temperature changes, and rain and snow erosion. Therefore, in addition to sufficient load-bearing capacity, asphalt concrete must possess excellent durability against natural environmental conditions, specifically manifested in stability under high-temperature environments, crack resistance under low-temperature conditions, water stability after rainwater immersion, anti-aging properties during long-term use, and anti-skid properties to ensure driving safety. These characteristics collectively determine the service quality and service life of asphalt pavement. However, in practical applications, asphalt pavements are subject to long-term ultraviolet radiation, alternating day and night temperature differences, and rainwater infiltration. This causes the bonding properties of the asphalt material to rapidly deteriorate, leading to a significant decrease in the surface structural strength of the pavement. Aged asphalt materials become more brittle, and under the influence of load impact and temperature stress, irregular cracks easily form on the pavement surface. These cracks expand rapidly as aging progresses, severely damaging the appearance and functionality of the asphalt pavement, significantly shortening its service life, and increasing subsequent maintenance costs and traffic congestion. Utility Model Content

[0003] The purpose of this invention is to provide a composite modified asphalt mixture anti-aging pavement structural layer to address the aforementioned shortcomings in the prior art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: A composite modified asphalt mixture anti-aging pavement structural layer includes a subgrade, a crushed stone subbase laid on the subgrade, a cast-in-place layer poured on top of the crushed stone subbase, an asphalt seal layer laid on the cast-in-place layer, an asphalt base layer laid flat on top of the asphalt seal layer, a waterproof layer placed on top of the asphalt base layer, a drainage layer placed on top of the waterproof layer, an asphalt top layer laid flat on top of the drainage layer, a wear-resistant layer sprayed on top of the asphalt top layer, a first asphalt interlayer fiber mesh placed between the waterproof layer and the drainage layer, and a second asphalt interlayer fiber mesh placed between the drainage layer and the asphalt top layer.

[0005] The thickness of the asphalt sealant layer in the aforementioned composite modified asphalt mixture anti-aging pavement structural layer is 1 cm.

[0006] In the aforementioned composite modified asphalt mixture anti-aging pavement structural layer, the asphalt base layer is made of medium-grained asphalt concrete, and the thickness of the asphalt base layer is between 5-7 cm.

[0007] The composite modified asphalt mixture anti-aging pavement structure layer mentioned above has an asphalt top layer made of fine-grained asphalt concrete, and the thickness of the asphalt top layer is between 3-5 cm.

[0008] The aforementioned composite modified asphalt mixture anti-aging pavement structure layer also includes a roadside protection structure, which is set on both sides of the roadbed and connected to the asphalt top layer, drainage layer, waterproof layer, asphalt bottom layer, asphalt sealing layer, pouring layer and crushed stone subbase.

[0009] In the aforementioned composite modified asphalt mixture anti-aging pavement structure layer, along the width direction of the subgrade, the widths of the asphalt top layer, drainage layer, waterproof layer, asphalt bottom layer, and asphalt sealing layer are the same, and the width of the cast layer is greater than the width of the asphalt bottom layer, forming a first-step paving structure.

[0010] In the aforementioned composite modified asphalt mixture anti-aging pavement structural layer, the width of the crushed stone subbase is greater than the width of the cast-in-place layer, and a second stepped paving structure is formed between the crushed stone subbase and the cast-in-place layer.

[0011] The aforementioned composite modified asphalt mixture anti-aging pavement structure layer includes a roadside protection structure comprising a crushed stone filling edge layer and an asphalt edge layer, wherein the material of the asphalt edge layer is coarse-grained asphalt concrete.

[0012] In the above technical solution, the composite modified asphalt mixture anti-aging pavement structure layer provided by this utility model is provided on the foundation in sequence (from bottom to top) as follows: crushed stone subbase, pouring layer, asphalt sealant layer, asphalt base layer, waterproof layer, first asphalt interlayer fiber mesh, drainage layer, second asphalt interlayer fiber mesh, asphalt top layer and wear-resistant layer. The asphalt sealant layer and waterproof layer effectively prevent rainwater infiltration, and the drainage layer can quickly drain infiltrated rainwater. The first asphalt interlayer fiber mesh and the second asphalt interlayer fiber mesh are respectively embedded between the waterproof layer and the drainage layer, and between the drainage layer and the asphalt top layer. When encountering micro-cracks, they disperse stress to prevent their expansion, reduce interlayer displacement, maintain the integrity of the asphalt layer to reduce local aging, and the top wear-resistant layer reflects ultraviolet rays to reduce the photo-oxidative aging of the top asphalt layer. In this way, by setting multiple road layers, the degradation of the asphalt layer by rainwater, air and ultraviolet rays is reduced, the aging rate of the asphalt pavement is reduced, and the pavement life is greatly extended. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings.

[0014] Figure 1 One of the structural schematic diagrams of the composite modified asphalt mixture anti-aging pavement structural layer provided in the embodiments of this utility model; Figure 2 This is the second schematic diagram of the composite modified asphalt mixture anti-aging pavement structural layer provided in the embodiment of this utility model.

[0015] Explanation of reference numerals in the attached figures: 1. Subgrade; 11. Crushed stone subbase; 12. Cast-in-place layer; 13. Asphalt sealant layer; 2. Asphalt base layer; 3. Waterproof layer; 4. Drainage layer; 5. Asphalt top layer; 51. Wear-resistant layer; 6. First asphalt interlayer fiber mesh; 7. Second asphalt interlayer fiber mesh; 8. Roadside protection structure; 81. First stepped paving structure; 82. Second stepped paving structure; 83. Crushed stone filling edge layer; 84. Asphalt edge layer. Detailed Implementation

[0016] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0017] like Figure 1-2 As shown, this utility model provides a composite modified asphalt mixture anti-aging pavement structural layer. A crushed stone base course 11 is laid on the foundation 1. A casting layer 12 is poured on the top of the crushed stone base course 11. An asphalt sealant layer 13 is laid on the casting layer 12. An asphalt base course 2 is laid flat on top of the asphalt sealant layer 13. A waterproof layer 3 is set on top of the asphalt base course 2. A drainage layer 4 is set on top of the waterproof layer 3. An asphalt top course 5 is laid flat on top of the drainage layer 4. A wear-resistant layer 51 is sprayed on the top of the asphalt top course 5. A first asphalt interlayer fiber mesh 6 is set between the waterproof layer 3 and the drainage layer 4. A second asphalt interlayer fiber mesh 7 is set between the drainage layer 4 and the asphalt top course 5.

[0018] Specifically, the composite modified asphalt mixture anti-aging pavement structure layer includes, from bottom to top, a crushed stone subbase 11, a cast-in-place layer 12, an asphalt sealant layer 13, an asphalt base layer 2, a waterproof layer 3, a first asphalt interlayer fiber mesh 6, a drainage layer 4, a second asphalt interlayer fiber mesh 7, an asphalt top layer 5, and a wear-resistant layer 51. Each layer is tightly connected to form a complete pavement structure. The crushed stone subbase 11 is formed by paving and compacting graded crushed stone on the subgrade 1. The thickness of the crushed stone subbase 11 is between 18-22 cm, preferably 20 cm. The top of the crushed stone subbase 11 is tightly bonded to the cast-in-place layer 12, which is a cement-crushed stone cast-in-place structure with a thickness between 25-30 cm, preferably 26 cm.

[0019] In this embodiment, a 1cm thick asphalt sealant layer 13 is sprayed onto the top of the poured layer 12. The asphalt sealant layer 13 is made of No. 70 base asphalt mixed with 4% composite anti-aging agent, and simultaneously spread with 8mm premixed crushed stone and compacted, firmly bonding with the poured layer 12 and the asphalt base layer 2 above it. The asphalt base layer 2 is medium-grained asphalt concrete with a thickness between 5-7cm, preferably 6cm thick. The asphalt mixture of the asphalt base layer 2 is SBS and rubber powder composite modified asphalt. A modified emulsified asphalt waterproof layer 3 is sprayed onto the top of the asphalt base layer 2. A first asphalt interlayer fiber mesh 6 is laid on top of the waterproof layer 3. The first asphalt interlayer fiber mesh 6 is a polyester fiber woven mesh with a wire diameter of 0.5mm, a mesh size of 2cm, and an overlap width of 10cm, tightly adhering to the waterproof layer 3.

[0020] Above the first asphalt interlayer fiber mesh 6 is the drainage layer 4, which has a mixed asphalt particle structure and a porosity between 20% and 28%. A second asphalt interlayer fiber mesh 7, made of glass fiber reinforced mesh with a wire diameter of 0.6 mm and a mesh size of 1.5 cm, is laid tightly on top of the drainage layer 4. Through the combined use of the waterproof layer 3 and the drainage layer 4, water seeping downwards from the pavement can be quickly drained away, preventing it from penetrating to the bottom structure and thus reducing its strength due to long-term immersion. The second asphalt interlayer fiber mesh 7 also prevents particles from the top asphalt layer 5 from falling and clogging the drainage layer 4, extending the service life of the pavement structure.

[0021] Above the second asphalt interlayer fiber mesh 7 is the asphalt top layer 5, which is fine-grained asphalt concrete. The thickness of the asphalt top layer 5 is between 3-5 cm, preferably 4 cm. The asphalt binder is composite modified asphalt (4% SBS content + 2% anti-aging agent content), and the aggregate is diabase. An emulsion-type wear-resistant spray is sprayed on top of the asphalt top layer 5 to form a wear-resistant layer 51, which becomes integral with the asphalt top layer 5 after 24 hours of curing.

[0022] In this embodiment, the construction steps of the composite modified asphalt mixture anti-aging pavement structural layer are as follows: Foundation 1 treatment and crushed stone subbase 11 construction: First, use a rammer to compact foundation 1, then use a graded crushed stone paver to pave crushed stone subbase 11. After paving, use a heavy vibratory roller to compact it, with no less than 5 passes, until the density reaches more than 96%.

[0023] Construction of Poured Layer 12: Spray emulsified asphalt tack coat on the surface of the crushed stone base course 11. After the tack coat has penetrated, pour cement-cement-crushed stone concrete. The concrete is centrally mixed at a commercial concrete batching plant, transported to the site, and spread using a concrete paver. The thickness is controlled at 26cm. After spreading, it is compacted with an immersion vibrator, and the surface is smoothed with a trowel. Then, it is covered with geotextile and watered for curing.

[0024] Construction of Asphalt Sealing Layer 13: After the curing of the pouring layer 12 is completed, use an asphalt distributor to spray No. 70 base asphalt (with 4% compound anti-aging agent added), ensuring that the sealing layer thickness is 1cm. At the same time, use a stone spreader to spread 8mm premixed crushed stone (spreading amount 4kg / ㎡), and then use a steel wheel roller to compact it, so that the crushed stone is embedded in the asphalt to form a solid sealing layer.

[0025] Construction of Asphalt Base Layer 2: After the asphalt sealing layer 13 cools to below 50℃, medium-grained asphalt concrete is paved using an asphalt paver. The paving temperature is controlled at 165℃ and the thickness is 6cm. After paving, it is compacted with a double steel wheel roller.

[0026] Construction of the fiber mesh 6 between the waterproof layer 3 and the first asphalt layer: After the asphalt base layer 2 has cooled, the modified emulsified asphalt waterproof layer 3 is sprayed with an asphalt distributor. After the waterproof layer 3 is surface dry, the fiber mesh 6 between the first asphalt layer is laid manually to ensure that the fiber mesh is flat and wrinkle-free. The overlap is firmly bonded with asphalt adhesive, and the overlap width is 10cm.

[0027] Construction of Drainage Layer 4: After the fiber mesh 6 between the first asphalt layers is laid, the graded asphalt macadam is laid using an asphalt paver at a paving temperature of 160℃ and a thickness of 5cm. After paving, it is compacted 3 times with a tire roller to ensure that the porosity is between 20% and 28%, while avoiding excessive compaction that could cause the porosity to become blocked.

[0028] Construction of the second asphalt interlayer fiber mesh 7 and the top asphalt layer 5: After the drainage layer 4 cools, the second asphalt interlayer fiber mesh 7 (glass fiber reinforced mesh) is laid manually, requiring it to be tightly bonded to the drainage layer 4 with an overlap width of 10cm and a firm adhesion. Subsequently, a fine-grained asphalt concrete with a thickness of 4cm is laid using an asphalt paver, and the compaction process is the same as that of the asphalt base layer 2, ensuring a density of over 98%.

[0029] Construction of wear-resistant layer 51: After the top asphalt layer 5 cools to below 50℃, use a high-pressure sprayer to spray emulsion-type wear-resistant spray to ensure uniform spraying without any leaks. After spraying, allow it to cure naturally.

[0030] The composite modified asphalt mixture anti-aging pavement structure layer provided by this utility model consists of the following layers arranged sequentially (from bottom to top) on the foundation 1: a crushed stone subbase 11, a cast-in-place layer 12, an asphalt sealant layer 13, an asphalt base layer 2, a waterproof layer 3, a first asphalt interlayer fiber mesh 6, a drainage layer 4, a second asphalt interlayer fiber mesh 7, an asphalt top layer 5, and a wear-resistant layer 51. The asphalt sealant layer 13 and the waterproof layer 3 effectively prevent rainwater infiltration, and the drainage layer 4 can quickly drain infiltrated rainwater. The first and second asphalt interlayer fiber meshes 7 are respectively embedded between the waterproof layer 3 and the drainage layer 4, and between the drainage layer 4 and the asphalt top layer 5. When encountering micro-cracks, they disperse stress to prevent their expansion, prevent air and ultraviolet rays from intruding, and at the same time reduce interlayer displacement, maintain the integrity of the asphalt layer to reduce local aging. The top wear-resistant layer 51 reflects ultraviolet rays, reducing the photo-oxidative aging of the asphalt top layer 5. In this way, by setting multiple layers, the degradation of the asphalt layer by rainwater, air, and ultraviolet rays is reduced, the aging rate of the asphalt pavement is reduced, and the pavement life is significantly extended.

[0031] In this embodiment, preferably, a roadside protection structure 8 is also included, which is set on both sides of the roadbed and connected to the asphalt top layer 5, drainage layer 4, waterproof layer 3, asphalt bottom layer 2, asphalt sealing layer 13, pouring layer 12 and crushed stone base layer 11. That is, a roadside protection structure 8 is set on both sides in the road width direction. To ensure the roadside protection structure 8 is connected to the composite modified asphalt mixture anti-aging pavement structure layer, the asphalt base layer 2, the cast-in-place layer 12, and the crushed stone subbase layer 11 are provided with different widths. Along the width direction of the subgrade, the asphalt top layer 5, the drainage layer 4, the waterproof layer 3, the asphalt base layer 2, and the asphalt sealing layer 13 have the same width. The width of the cast-in-place layer 12 is greater than the width of the asphalt base layer 2, forming a first stepped paving structure 81. The width of the crushed stone subbase layer 11 is greater than the width of the cast-in-place layer 12, forming a second stepped paving structure 82 between the crushed stone subbase layer 11 and the cast-in-place layer 12. The roadside protection structure 8 includes a crushed stone filling edge layer 83 and an asphalt edge layer 84. The material of the asphalt edge layer 84 is coarse-grained asphalt concrete.

[0032] This creates a two-tiered, stepped support structure from top to bottom. The first stepped paving structure 81 is formed by the top surface of the extended portion of the cast-in-place layer 12 and the sidewalls of the asphalt base layer 2, waterproof layer 3, drainage layer 4, and asphalt top layer 5. The second stepped paving structure 82 is formed by the sidewalls of the cast-in-place layer 12 and the top surface of the extended portion of the crushed stone base layer 11. Simultaneously, the ends of the crushed stone base layer 11 have pre-set filling gaps. The crushed stone filling edge layer 83 is laid on the filling gaps and the second stepped paving structure 82. The asphalt edge layer 84 is laid on the first stepped paving structure 81. The asphalt edge layer 84 uses coarse-grained asphalt concrete to improve its drainage effect. The roadside protection structure 8 is constructed simultaneously with the composite modified asphalt mixture anti-aging pavement structure. The roadside protection structure 8 improves lateral stability, resists lateral pressure, prevents asphalt layer displacement, and reduces asphalt stripping rate and longitudinal cracking rate.

[0033] The foregoing description only illustrates certain exemplary embodiments of the present invention. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A composite modified asphalt mixture anti-aging pavement structural layer, comprising a subgrade, characterized in that, A crushed stone base course is laid on the foundation. A casting layer is poured on top of the crushed stone base course. An asphalt sealant layer is laid on top of the casting layer. An asphalt base course is laid flat on top of the asphalt sealant layer. A waterproof layer is installed on top of the asphalt base course. A drainage layer is installed on top of the waterproof layer. An asphalt top course is laid flat on top of the drainage layer. A wear-resistant layer is sprayed on top of the asphalt top course. A first asphalt interlayer fiber mesh is installed between the waterproof layer and the drainage layer. A second asphalt interlayer fiber mesh is installed between the drainage layer and the asphalt top course.

2. The composite modified asphalt mixture anti-aging pavement structural layer according to claim 1, characterized in that, The thickness of the asphalt sealant layer is 1 cm.

3. The composite modified asphalt mixture anti-aging pavement structural layer according to claim 1, characterized in that, The material of the asphalt base layer is medium-grained asphalt concrete, and the thickness of the asphalt base layer is between 5 and 7 cm.

4. The composite modified asphalt mixture anti-aging pavement structural layer according to claim 1, characterized in that, The material of the asphalt top layer is fine-grained asphalt concrete, and the thickness of the asphalt top layer is between 3-5 cm.

5. The composite modified asphalt mixture anti-aging pavement structural layer according to claim 1, characterized in that, It also includes roadside protection structures, which are set on both sides of the roadbed and connected to the asphalt top layer, drainage layer, waterproof layer, asphalt bottom layer, asphalt sealing layer, pouring layer and crushed stone base course.

6. The composite modified asphalt mixture anti-aging pavement structural layer according to claim 5, characterized in that, Along the width direction of the roadbed, the widths of the asphalt top layer, drainage layer, waterproof layer, asphalt bottom layer and asphalt sealing layer are the same, and the width of the cast layer is greater than the width of the asphalt bottom layer, forming a first stepped paving structure.

7. The composite modified asphalt mixture anti-aging pavement structural layer according to claim 6, characterized in that, The width of the crushed stone base layer is greater than the width of the cast-in-place layer, and a second stepped paving structure is formed between the crushed stone base layer and the cast-in-place layer.

8. The composite modified asphalt mixture anti-aging pavement structural layer according to claim 7, characterized in that, The roadside protection structure includes a gravel-filled edge layer and an asphalt edge layer, wherein the material of the asphalt edge layer is coarse-grained asphalt concrete.

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