Assembled asphalt pavement prefabricated block and manufacturing method thereof

Abstract

The present invention discloses an assembled asphalt pavement prefabricated block and a manufacturing method thereof. The prefabricated block is provided with a reinforcement layer, an asphalt lower layer, an interlocking layer, an anti-skid asphalt upper layer and a super-hydrophobic coating in sequence from bottom to top, and two adjacent layers of the structure are bonded by spraying a tack coat oil; a connection portion is provided on the prefabricated block, and a plurality of prefabricated blocks are longitudinally connected through the connection portion; the present invention can realize factory production by prefabricating the asphalt surface layer, improve construction accuracy and engineering quality, reduce construction pollution, simplify construction procedures, and improve labor efficiency; and each prefabricated block is numbered for rapid positioning and maintenance and replacement; at the same time, a sensor device can also be buried in advance during prefabrication to provide support for intelligent monitoring of road quality.

Description

Technical Field

[0001] The invention relates to the technical field of road engineering, and in particular to an assembled asphalt pavement prefabricated block and a manufacturing method thereof. Background Art

[0002] The information disclosed in this background technology section is only intended to enhance the understanding of the overall background of the invention, and should not necessarily be regarded as an admission or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art.

[0003] At present, the development of prefabricated buildings is in full swing. Among them, prefabricated roads are not very mature compared to other similar industries. Prefabricated asphalt pavements are more difficult to prefabricate than prefabricated cement concrete pavements due to their special flexible structure. At present, most of the research on prefabricated roads involves prefabricated road base plates, prefabricated cement concrete pavement plates, and plate processing. The current research work on prefabricated asphalt pavements is still in the early stages of application, and there is still a lot of room for research on prefabricated asphalt pavements.

[0004] Traditional asphalt pavement construction often causes significant air and noise pollution, and usually fails to achieve very ideal construction quality results. However, prefabricated asphalt pavement can avoid on-site mixing and is quick to spread; factory prefabrication can achieve streamlined and factory-based production, ensuring construction quality and engineering results; and it is easy to repair and maintain; more importantly, it can reduce the generation of construction waste and reduce urban environmental pollution, which is an important trend in the future development of modern roads.

[0005] Therefore, accelerating the research on prefabricated asphalt pavements with the advantages of fast construction, convenient maintenance, and resource conservation is of great significance to the development of prefabricated roads. Summary of the invention

[0006] In view of the problems existing in the prior art, the present invention provides an assembled asphalt pavement prefabricated block and a manufacturing method thereof, which can improve the structural strength of the asphalt pavement, enhance the bearing capacity of the pavement, and improve the problem of water seepage and accumulation in the pavement, while having the advantages of convenient installation and maintenance.

[0007] The technical solution of the present invention is as follows:

[0008] In a first aspect of the present invention, there is provided an assembled asphalt pavement prefabricated block, wherein the prefabricated block is provided with a reinforcement layer, an asphalt lower layer, an interlocking layer, an anti-skid asphalt upper layer and a super-hydrophobic coating in sequence from bottom to top, and two adjacent layers of the structure are bonded together by spraying a tack coat oil; a connecting portion is provided on the prefabricated block, and a plurality of prefabricated blocks are longitudinally connected through the connecting portion.

[0009] In some embodiments of the present invention, the reinforcement layer is a hot-dip galvanized double-twisted reinforcement mesh.

[0010] In some embodiments of the present invention, the asphalt lower layer is asphalt concrete mixed with basalt fibers, the length of the basalt fibers is 9 mm, and the mixing amount is 0.3%.

[0011] In some embodiments of the present invention, the interlocking layer is made of glass fiber grid or other geogrids.

[0012] In some embodiments of the present invention, the anti-skid asphalt top layer is a mastic asphalt crushed stone surface layer mixed with basalt fibers, the length of the basalt fibers is 9 mm, and the mixing amount is 0.3%.

[0013] In some embodiments of the present invention, the super hydrophobic coating is formed by brushing a nano-silicon dioxide super hydrophobic coating liquid on the upper surface of the prefabricated block and then spraying it.

[0014] In some embodiments of the present invention, the tack coat oil is modified emulsified asphalt or thermally modified asphalt.

[0015] In some embodiments of the present invention, the connecting portion is an upper connecting block and a lower connecting block arranged at both ends of the prefabricated block, and the upper connecting block and the lower connecting block are provided with threaded connecting holes, and two adjacent prefabricated blocks are connected by a screw.

[0016] In some embodiments of the present invention, the prefabricated block has a width of one lane, a length of 5-20 m, and a thickness of 5.5-7.5 cm.

[0017] In a second aspect of the present invention, a method for manufacturing a prefabricated asphalt pavement block is provided, comprising the following steps:

[0018] After cleaning the surface of the special substrate, lay the reinforcement layer: double-twisted steel mesh;

[0019] Spray adhesive layer oil on the double-twisted steel mesh: modified emulsified asphalt;

[0020] Spread the asphalt bottom layer and roll it;

[0021] Clean and level the surface, lay and fix the interlocking layer, i.e. the fiberglass grating, and roll it;

[0022] Spraying tack coat oil: modified emulsified asphalt;

[0023] Spread the asphalt top layer and roll it, and make the upper connecting block on the corresponding mold;

[0024] Clean the surface and spray slurry seal;

[0025] Clean the road surface, brush it, so that a part of the super-hydrophobic solution enters the inside of the road surface, and then use a spraying device to spray it to make a super-hydrophobic coating;

[0026] Cut out the plane of the lower connecting block at the connection position, and reserve the corresponding splicing position of the upper connecting block; chisel threaded holes of corresponding apertures on the upper and lower connecting blocks, and make the size and position of the connecting holes the same.

[0027] One or more technical solutions of the present invention have the following beneficial effects:

[0028] (1) The present invention provides a double-twisted reinforcement mesh with high strength, low creep and resistance to brittle cracking, which can interlock with the asphalt aggregate to play a reinforcement role and can instantly transfer the concentrated load to the reinforced surface, thereby improving the structural strength of the asphalt surface layer, effectively delaying the development of reflective cracks and fatigue cracks in the road surface, and improving the load-bearing and service life.

[0029] (2) The present invention provides a glass fiber grid as an interlocking layer between the asphalt surface layers. The glass fiber grid has high tensile strength in both longitudinal and transverse directions, low elongation, and is resistant to high temperature, low cold, and corrosion. The interlocking layer has good compatibility with asphalt and can play a skeleton role in the asphalt surface layer, forming a composite mechanical interlocking system, which limits the movement of aggregate particles and enhances the lateral restraint force in the asphalt surface layer, thereby reducing rutting deformation and displacement.

[0030] (3) The present invention incorporates basalt fiber into asphalt. The basalt fiber can utilize the uneven surface characteristics of itself to mechanically anchor and adsorb asphalt with the asphalt mixture, and firmly combine with the asphalt, thereby enhancing the internal stability of the asphalt, reducing the temperature sensitivity of the asphalt, and improving the temperature stability of the asphalt; at the same time, the basalt fiber can be dispersed in the mixture to form a multi-dimensional fiber network, thereby improving the crack resistance and structural strength of the asphalt surface layer and extending the service life.

[0031] (4) The present invention sprays a super-hydrophobic coating on the surface of the asphalt, which can make the asphalt pavement hydrophobic, anti-skid, and anti-icing to a certain extent, thereby ensuring driving safety and achieving sustainable road development.

[0032] (5) The present invention can realize factory production by prefabricating the asphalt surface layer, improve construction accuracy and project quality, reduce construction pollution, simplify construction procedures, and improve labor efficiency; and each prefabricated block is numbered for rapid positioning and maintenance and replacement; at the same time, the sensor device can also be buried in advance during prefabrication to provide support for intelligent monitoring of road quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of the structural hierarchy of the prefabricated asphalt pavement block of the present invention;

[0034] Figure 2 A top view of the prefabricated asphalt pavement block of the present invention;

[0035] Figure 3 It is a structural schematic diagram of the lower connecting block of the prefabricated block connecting part of the assembled asphalt pavement of the present invention;

[0036] Figure 4 It is a schematic structural diagram of the upper connecting block of the prefabricated block connecting portion of the assembled asphalt pavement of the present invention.

[0037] In the figure: 1-superhydrophobic coating, 2-anti-skid asphalt upper layer, 3-interlocking layer, 4-asphalt lower layer, 5-reinforcement layer, 6-functional layer (sealing layer and bonding layer), 7-crushed stone layer (base layer). DETAILED DESCRIPTION

[0038] The present invention will be described below in conjunction with the accompanying drawings.

[0039] Example 1

[0040] In a typical embodiment of the present invention, a prefabricated asphalt pavement block is provided, such as Figure 1-4 As shown, the prefabricated block is provided with a reinforcement layer 5, an asphalt lower layer 4, an interlocking layer 3, an anti-skid asphalt upper layer 2 and a super-hydrophobic coating 1 in sequence from bottom to top, wherein the thickness of the asphalt lower layer 4 is set to 32-45 mm, the thickness of the anti-skid asphalt upper layer 2 is set to 20-28 mm, and the two adjacent layers of the structure are bonded by spraying adhesive layer oil; a connecting portion is provided on the prefabricated block, and a plurality of prefabricated blocks are longitudinally connected through the connecting portion.

[0041] The reinforcement layer 5 adopts hot-dip galvanized double-twisted reinforcement mesh with a mesh specification of 80mm×100mm and a reinforcement rod diameter of 3.4mm, which can be cut as needed; the hot-dip galvanized double-twisted reinforcement mesh has the characteristics of high strength, low creep, and resistance to brittle cracking. It can interlock with asphalt aggregate to play a reinforcement role and can instantly transfer concentrated loads to the reinforced surface, thereby improving the structural strength of the asphalt surface layer, effectively delaying the development of reflective cracks and fatigue cracks in the road surface, and improving the load-bearing and service life.

[0042] The asphalt lower layer 4 is AC-20 asphalt concrete mixed with basalt fiber, the length of the basalt fiber is 9 mm, and the mixing amount is 0.3%; the basalt fiber can use its own uneven surface characteristics to mechanically anchor and adsorb asphalt with the asphalt mixture, and firmly combine with the asphalt, thereby enhancing the internal stability of the asphalt, reducing the temperature sensitivity of the asphalt, and improving the temperature stability of the asphalt; at the same time, the basalt fiber can be dispersed in the mixture to form a multi-dimensional fiber network, thereby improving the asphalt surface layer's ability to resist cracking and structural strength, and extending its service life.

[0043] The interlocking layer 3 is made of glass fiber grid or one of other geogrids, and specifically a glass fiber grid with a mesh size of 3mm×3mm can be selected; the glass fiber grid has the characteristics of high tensile strength in both longitudinal and transverse directions, low elongation, high temperature resistance, low cold resistance, and corrosion resistance. It is arranged between the asphalt lower layer 4 and the anti-skid asphalt upper layer 2. It has good compatibility with asphalt, can play a skeleton role in the asphalt surface layer, and form a composite mechanical interlocking system, which limits the movement of aggregate particles and enhances the lateral restraint force in the asphalt surface layer, thereby reducing the deformation and displacement of rutting.

[0044] The anti-skid asphalt upper layer 2 is a SMA-13 ​​mastic asphalt crushed stone mixture mixed with basalt fibers, wherein the length of the basalt fibers is 9 mm and the mixing amount is 0.3%.

[0045] The super-hydrophobic coating 1 is made by brushing a nano-silicon dioxide super-hydrophobic coating liquid on the upper surface of the prefabricated block and then spraying it; by spraying the super-hydrophobic coating, the asphalt pavement can be made hydrophobic, anti-skid, anti-icing, and anti-icing to a certain extent, thereby ensuring driving safety and achieving sustainable road development.

[0046] In this embodiment, the tack coat oil is modified emulsified asphalt or thermally modified asphalt, which can ensure firm adhesion between layers and improve the strength of the entire prefabricated block.

[0047] In this embodiment, if Figure 2-4 As shown, the connection part is an upper connection block and a lower connection block arranged at both ends of the prefabricated block, and the upper connection block and the lower connection block are provided with threaded connection holes, and two adjacent prefabricated blocks are connected by screws; specifically, the connection part is a reserved position on the asphalt surface layer, which is directly made corresponding to the mold, and each prefabricated block is provided with 4 upper and lower connection blocks, and a number of threaded connection holes are provided on the connection block. The upper connection block should be as thick as the upper layer of the asphalt, and the lower connection block should be as thick as the lower layer of the asphalt. When splicing, the upper and lower connection blocks should fit well. The hole diameters of the connection holes are equal, the corresponding upper and lower connection hole positions are the same, and the upper and lower orifices should correspond to each other without deviation when splicing; the connection holes are fixed to the upper and lower connection blocks by threaded rods of corresponding diameters to connect two adjacent prefabricated blocks.

[0048] The above layers are paved, rolled, and stacked into prefabricated blocks. The width of the prefabricated blocks is one lane width, the length is 5-20m, and the thickness is 5.5-7.5cm. In some embodiments, the layers of prefabricated blocks are paved, rolled, and stacked into blocks with a thickness of 6.5cm, a width of 3.5m, and a length of 15m. Each prefabricated block is numbered according to the following rules: from the first row of the construction starting point to the end point; the blocks with the driving direction from the starting point to the end point are Q, and the blocks with the driving direction from the end point to the starting point are Z; the numbering increases from the blocks close to the center line of the road. For example: 1-Q-2 is the first row from the starting point, the driving direction is from the beginning to the end, and the second prefabricated block from the center line of the road.

[0049] The steps for installing and using the prefabricated asphalt pavement blocks provided in this embodiment are as follows:

[0050] (1) After the construction of gravel layer 7 is completed, spray the penetrating oil (PC-2 emulsified asphalt, 1L / m 2 ), so that the penetrating oil penetrates into the gap of the base layer by at least 0.6 cm, forming a functional layer 6, which plays a sealing and bonding role, and then watering and curing;

[0051] (2) Clean and level the road surface, roughen it, and then spray the tack coat: modified emulsified asphalt (0.5L / m 2 );

[0052] (3) When laying prefabricated blocks, the joint holes should be aligned;

[0053] (4) Insert the threaded rod spirally to complete the longitudinal connection; fill the joints and transverse joints to complete the assembly.

[0054] The prefabricated asphalt pavement blocks provided in this embodiment can realize factory production by prefabricating the asphalt surface layer, thereby improving construction accuracy and project quality, reducing construction pollution, simplifying construction procedures, and improving labor efficiency; and each prefabricated block is numbered for rapid positioning and maintenance and replacement; at the same time, the sensor device can also be buried in advance during prefabrication to provide support for intelligent monitoring of road quality.

[0055] Example 2

[0056] In a typical embodiment of the present invention, a method for manufacturing a prefabricated asphalt pavement block is provided, comprising the following steps:

[0057] Clean the surface of the special substrate (metal plate, with rough surface treatment or engraved pattern) and lay the reinforcement layer: double-twisted steel mesh;

[0058] Spray adhesive layer oil on the double-twisted steel mesh: modified emulsified asphalt (0.5L / m 2 );

[0059] Spread the asphalt bottom layer and roll it;

[0060] Clean and level the surface, lay and fix the interlocking layer, i.e. the fiberglass grating, and roll it;

[0061] Spraying tack oil: modified emulsified asphalt (0.5L / m 2 );

[0062] Spread the asphalt top layer and roll it, and make the upper connecting block on the corresponding mold;

[0063] Clean the surface and spray slurry seal;

[0064] Clean the road surface, brush it, so that a part of the super-hydrophobic solution enters the inside of the road surface, and then use a spraying device to spray it to make a super-hydrophobic coating;

[0065] Cut out the plane of the lower connecting block at the connection position, reserve the corresponding splicing position of the upper connecting block, chisel threaded holes of corresponding apertures on the upper and lower connecting blocks, and make the size and position of the connecting holes the same.

[0066] The embodiments described above provide a detailed description of the technical solutions of the present invention. It should be understood that the above are only specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, supplements or similar substitutions made within the scope of the principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An assembled asphalt pavement prefabricated block, characterized in that: The prefabricated block is provided with a reinforcement layer, an asphalt lower layer, an interlocking layer, an anti-skid asphalt upper layer and a super-hydrophobic coating in sequence from bottom to top, and the two adjacent layers are bonded by spraying adhesive layer oil; a connection part is provided on the prefabricated block, and a plurality of prefabricated blocks are longitudinally connected through the connection part; The reinforcement layer is hot-dip galvanized double-twisted reinforcement mesh; The asphalt lower layer is AC-20 asphalt concrete mixed with basalt fiber; the double-twisted reinforcement mesh is interlocked with the asphalt aggregate to play a reinforcement role and instantly transfer the concentrated load to the reinforced surface, thereby improving the structural strength of the asphalt surface layer and delaying the development of reflective cracks and fatigue cracks on the road surface; The anti-skid asphalt top layer is an asphalt mastic crushed stone surface layer mixed with basalt fibers; Basalt fiber can use its own uneven surface characteristics to mechanically anchor and absorb asphalt with asphalt mixture, firmly bond with asphalt, thereby enhancing the internal stability of asphalt, reducing the temperature sensitivity of asphalt, and improving the temperature stability of asphalt; The super hydrophobic coating is made by brushing a nano-silicon dioxide super hydrophobic coating liquid on the upper surface of the prefabricated block and then spraying it; The connecting part is an upper connecting block and a lower connecting block arranged at both ends of the prefabricated block; the upper connecting block should be as thick as the upper layer of asphalt, and the lower connecting block should be as thick as the lower layer of asphalt; The upper connecting block and the lower connecting block are provided with threaded connecting holes, and two adjacent prefabricated blocks are connected by screw rods; The interlocking layer is made of glass fiber grid or one of other geogrids, which is compatible with asphalt, plays a skeleton role in the asphalt surface layer, forms a composite mechanical interlocking system, limits the movement of aggregate particles, enhances the lateral restraint force in the asphalt surface layer, and plays a role in reducing rutting deformation and displacement.

2. The prefabricated asphalt pavement block according to claim 1, characterized in that: The length of the basalt fiber is 9 mm, and the dosage is 0.3%.

3. The prefabricated asphalt pavement block according to claim 1, characterized in that: The tack coat oil is modified emulsified asphalt or thermally modified asphalt.

4. The prefabricated asphalt pavement block according to claim 1, characterized in that: The prefabricated block has a width of one lane, a length of 5-20m, and a thickness of 5.5-7.5cm.

5. A method for manufacturing a prefabricated asphalt pavement block according to any one of claims 1 to 4, characterized in that: The following steps are involved: After cleaning the surface of the special substrate, lay the reinforcement layer: double-twisted steel mesh; Spray adhesive layer oil on the double-twisted steel mesh: modified emulsified asphalt; Spread the asphalt bottom layer and roll it; Clean and level the surface, lay and fix the interlocking layer, i.e. the fiberglass grating, and roll it; Spraying tack coat oil: modified emulsified asphalt; Spread the asphalt top layer and roll it, and make the upper connecting block on the corresponding mold; Clean the surface and spray slurry seal; Clean the road surface, brush it, so that a part of the super-hydrophobic solution enters the inside of the road surface, and then use a spraying device to spray it to make a super-hydrophobic coating; Cut out the plane of the lower connecting block at the connection position, and reserve the corresponding splicing position of the upper connecting block; chisel threaded holes of corresponding apertures on the upper and lower connecting blocks, and make the size and position of the connecting holes the same.

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