High-viscosity asphalt modifier permeable asphalt pavement construction method

Abstract

The application discloses a high-viscosity asphalt modifier permeable asphalt pavement construction method in the field of road construction, which comprises a filler, a pavement material and a repairing material, wherein the repairing material adopts foamed asphalt, the pavement material is added into cracks generated during pavement material laying by using a grouting pump to form a repairing base, the filler is then added into the repairing base, the height of the crack where the filler is added is lower than that of a pavement base layer, the foamed material is then laid on the surface of the filler, and finally the pavement material is laid on the surface of the foamed material according to the shape of the crack and is subjected to actual compression. In the technical scheme, not only the material cost is saved, but also the diffusion range of the pavement material is limited, and the compactness between the pavement material and the crack space is improved.

Description

Technical Field

[0001] This invention belongs to the field of road construction, specifically a construction method for permeable asphalt pavement using a high-viscosity asphalt modifier. Background Technology

[0002] In the current social environment, urban modernization is developing rapidly, meeting people's daily life and travel needs while driving urban economic growth. Highway construction is a crucial basic infrastructure project for people's livelihood in urban modernization, ensuring urban transportation and people's normal travel, and is an important measure to promote urban economic and cultural development. Asphalt concrete is one of the commonly used materials in urban highway construction, and asphalt concrete pavement construction technology is a key factor determining the quality of highway pavement construction. Currently, existing technologies still have some shortcomings in asphalt concrete pavement construction, which to some extent reduces the quality of urban highway construction.

[0003] Cracking is a major problem in the construction of asphalt concrete highway pavements, posing serious safety hazards and affecting pavement quality. The main causes of cracking are uneven filler and insufficient compaction of the filler material. Without effective compaction during asphalt concrete pavement construction, the density of the pavement layer will inevitably decrease, leading to cracks and eventually longitudinal fissures, thus affecting construction quality. Therefore, improving asphalt concrete pavement construction technology is an urgent problem to be solved. Summary of the Invention

[0004] To address the problem of cracking during asphalt construction, the present invention provides a construction method for permeable asphalt pavement using a high-viscosity asphalt modifier.

[0005] To achieve the above objectives, the technical solution of the present invention is as follows: a construction method for permeable asphalt pavement using a high-viscosity asphalt modifier, comprising filler, pavement material, and repair material, wherein the repair material is foamed asphalt. The pavement material is added to the cracks generated during the laying of the pavement material using a grouting pump to form a repair base surface. Then, filler is added to the repair base surface, wherein the height of the crack where the filler is added is lower than that of the pavement base layer. Foam material is then laid on the surface of the filler material. Finally, the pavement material is laid on the surface of the foam material according to the shape of the crack and compacted.

[0006] Furthermore, it also includes the following steps:

[0007] S1. Selection of filler, pavement material and repair material: The selected filler is silicate-based modified asphalt, the foam material is foamed asphalt, and the pavement material is drainage asphalt.

[0008] S2, paving step, using several machines to pave together, with each machine paving width less than 4-6m;

[0009] S3, Crack Detection: This involves inspecting the paved road surface to determine the cause and type of cracks.

[0010] S4, Crack Analysis: Analyze the crack morphology and causes, and construct a crack model;

[0011] The selection of S5 grouting is based on the Darcy's law to construct a grouting diffusion model, which mainly considers cracks, interlayer loosening conditions and grouting pressure.

[0012] For S6 asphalt pavement base course joints, during the grouting process, the height of the crack is filled to 5-10 cm below the base course. Then, crushed stone particles are added and arranged at an angle. Foam material is then added to wrap the crushed stone particles. Finally, the pavement material is pushed along the angle of the crushed stone particles to complete the joint.

[0013] S7, asphalt pavement maintenance, uses sand and gravel as the main material, emulsified asphalt as the binder, and adds water and additives to form a maintenance material, which is then spread between the base layer and the surface layer of the highway.

[0014] The above solution achieves the following beneficial effects: In this technical solution, asphalt is layered for repair work, with the pavement material serving as the main support during the repair process. Due to the inclined arrangement of the crushed stone particles, the crushed stone particles form a tooth-like shape on both sides of the crack. When the foam material wraps around the crushed stone particles, the crushed stone particles will droop downwards, thus forming a concave wrapping space. Adding two layers of pavement material in the wrapping space not only saves material costs but also limits the diffusion range of the pavement material, improving the compactness of the loose pavement material filling the crack space.

[0015] Meanwhile, the road surface material is continuously filled by pushing along the inclined direction of the crushed stone particles, thereby transforming the crushed stone particles from an intermittent state into a connected structure to form a wedge surface, enhancing the stability of the repair surface. After the wedge surface is formed, two overlapping crushed stone particles form an acute angle. When the tensile force on both sides (i.e. the stress generated by the road surface due to vehicle traffic) is divided into two components by the wedge surface, since the trigonometric function of the acute angle is always less than 1, the component force is less than the tensile force, thus avoiding secondary cracking.

[0016] When repairs and inspections are needed, simply guide the engineering vehicle to the sharp-angled tow bar at the road surface gap, align the tow bar with the sharp corner of the wedge, and pull. When the pushing and pulling force is applied to the wedge, since the wedge is composed of triangular stones on the left and right sides, two component forces are generated on the tow bar. When the included angle is very small, the force acting on the sharp corner is large. The two component forces exert force on the left and right sides, and the component forces are greater than the resultant force vertically downward, that is, the component forces are greater than the pulling force of the tow bar. Therefore, the wedge that is difficult to separate directly is easily separated by the component forces.

[0017] Furthermore, in S2, the paving material needs to be laid evenly and continuously, and the paving speed should not be changed arbitrarily or stopped midway. The paving speed is 2 to 6 m / min.

[0018] Furthermore, during the paving process in S2, the screw feeder should rotate continuously, and both sides should maintain a mixture of at least 2 / 3 of the feeder height.

[0019] Furthermore, in S5, the model construction includes a diffusion model of grouting material in poor interlayer bonding and crack gaps of the pavement, and solving the model yields the pressure field distribution and velocity field distribution of the fluid flow; the calculated Darcy velocity field is coupled with the flow of porous rare matter to obtain the grouting concentration at different locations.

[0020] Beneficial effects: When the grouting hole is located at the bottom of the upper base layer, the grout can not only fill the base layer better, but also is less likely to overflow within a certain period of time. At the same time, as the grouting time increases, the grout diffusion radius under different grouting pressures gradually tends to flatten out.

[0021] Furthermore, in step S6, the road material is laid in two layers during the jointing process. The first layer of road material penetrates under the foam material, and the second layer of road material is pressed onto the surface of the foam material. The laying direction is the same each time.

[0022] Beneficial effects: A grouting crack diffusion model was established, and the diffusion path of grouting material in poor interlayer bonding and crack gaps was calculated by using Darcy's law and multi-physics field coupling of porous rare materials. Attached Figure Description

[0023] Figure 1 This is a modeling diagram of the grouting model in an embodiment of the present invention;

[0024] Figure 2 for Figure 1 Schematic diagram of grouting hole depth;

[0025] Figure 3 This is a graph showing the relationship between grouting pressure and time. Detailed Implementation

[0026] The following detailed description illustrates the specific implementation method:

[0027] The basic implementation examples are as follows: Figure 1 As shown: A construction method for permeable asphalt pavement using a high-viscosity asphalt modifier includes filler, pavement material, and repair material. The repair material is foamed asphalt. The pavement material is added to the cracks created by the pavement material laying using a grouting pump to form a repair base surface. Then, filler is added to the repair base surface, wherein the height of the crack where the filler is added is lower than that of the pavement base layer. Foam material is then laid on the surface of the filler. Finally, the pavement material is laid on the surface of the foam material according to the shape of the crack and compacted.

[0028] It also includes the following steps:

[0029] S1. Selection of filler, pavement material and repair material: The selected filler is silicate-based modified asphalt, the foam material is foamed asphalt, and the pavement material is drainage asphalt.

[0030] S2, paving step, using several machines to pave together, with each machine paving width less than 4-6m. The paving material needs to be uniform and uninterrupted, and the paving speed should not be changed arbitrarily or stopped in the middle. The paving speed is 2-6m / min. During paving, the screw feeder should rotate continuously, and there should be no less than 2 / 3 of the mixed material on both sides.

[0031] S3, Crack Detection: This involves inspecting the paved road surface to determine the cause and type of cracks.

[0032] S4, Crack Analysis: This section analyzes the crack morphology and causes. Please refer to [reference needed]. Figure 2 A crack model was constructed, including a diffusion model of the grouting material in the crack gaps due to poor bonding between pavement layers. Solving the model yielded the pressure and velocity field distributions of the fluid flow. Please refer to [reference needed]. Figure 3 The calculated Darcy velocity field is coupled with the flow transport of porous rare materials to obtain the grouting concentration and grouting pressure at different locations.

[0033] The selection of S5 grouting is based on the Darcy's law to construct a grouting diffusion model, which mainly considers cracks, interlayer loosening conditions and grouting pressure.

[0034] For S6 asphalt pavement base course joints, during the grouting process, the height of the crack is filled to 5-10 cm below the base course. Then, crushed stone particles are added and arranged at an angle. Foam material is then added to coat the crushed stone particles. Finally, the pavement material is pushed along the angle of the crushed stone particles to complete the joint. During the jointing process, the pavement material is laid in two layers. The first layer of pavement material penetrates under the foam material, and the second layer of pavement material is pressed on the surface of the foam material. The paving direction is the same for each layer.

[0035] S7, asphalt pavement maintenance, uses sand and gravel as the main material, emulsified asphalt as the binder, and adds water and additives to form a maintenance material, which is then spread between the base layer and the surface layer of the highway.

[0036] In this technical solution, asphalt is layered for repair work, with the pavement material serving as the main support during the repair process. Due to the inclined arrangement of the crushed stone particles, the particles form a tooth-like shape on both sides of the crack. When the foam material wraps around the crushed stone particles, the particles will droop downwards, thus forming a concave wrapping space. Adding two layers of pavement material in the wrapping space not only saves material costs but also limits the diffusion range of the pavement material, improving the compactness of the loose pavement material filling the crack space.

[0037] Meanwhile, the road surface material is continuously filled by pushing along the inclined direction of the crushed stone particles, thereby transforming the crushed stone particles from an intermittent state into a connected structure to form a wedge surface, enhancing the stability of the repair surface. After the wedge surface is formed, two overlapping crushed stone particles form an acute angle. When the tensile force on both sides (i.e. the stress generated by the road surface due to vehicle traffic) is divided into two components by the wedge surface, since the trigonometric function of the acute angle is always less than 1, the component force is less than the tensile force, thus avoiding secondary cracking.

[0038] A grouting crack diffusion model was established, and the diffusion path of the grouting material in poor interlayer bonding and crack gaps was calculated by using Darcy's law and multi-physics field coupling of porous rare materials.

[0039] When the grouting hole is located at the bottom of the upper base layer, the grout can not only fill the base layer better, but also is less likely to overflow within a certain period of time. At the same time, as the grouting time increases, the grout diffusion radius under different grouting pressures gradually tends to flatten out.

[0040] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0041] The above descriptions are merely embodiments of the present invention. Commonly known structures and characteristics are not described in detail here. Those skilled in the art are aware of all common technical knowledge in the field prior to the application date or priority date, are aware of all existing technologies in that field, and have the ability to apply conventional experimental methods prior to that date. Those skilled in the art can, under the guidance of this application, improve and implement this solution in combination with their own capabilities. Some typical known structures or methods should not be obstacles for those skilled in the art to implement this application. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of the present invention. These should also be considered within the scope of protection of the present invention, and will not affect the effectiveness of the implementation of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A construction method for permeable asphalt pavement using a high-viscosity asphalt modifier, characterized in that: It includes filler, pavement material and foam material. The foam material is foamed asphalt. The pavement material is added to the cracks caused by the pavement material laying using a grouting pump to form a repair base surface. Then, filler is added to the repair base surface. The height of the crack where the filler is added is lower than the pavement base. Then, foam material is laid on the surface of the filler. Finally, pavement material is laid on the surface of foam material and compacted according to the shape of the crack. It also includes the following steps: S1. Selection of filler, pavement material and foam material: The filler is silicate-based modified asphalt, the foam material is foamed asphalt, and the pavement material is drainage asphalt. S2, paving step, uses several machines to pave together, with each machine paving width less than 4-6m; S3, Crack Detection: This involves inspecting the paved road surface to determine the cause and type of cracks. S4, Crack Analysis: Analyze the crack morphology and causes, and construct a crack model; S5, Grouting selection: Darcy's law is used to construct a grouting diffusion model, which mainly considers cracks, interlayer loosening conditions and grouting pressure. S6, asphalt pavement base course joint, during the grouting process, the height of the crack is filled to 5-10 cm below the pavement base course, then crushed stone particles are added and arranged at an angle, followed by foam material to wrap the crushed stone particles, and then the pavement material is pushed and pressed along the inclined direction of the crushed stone particles to complete the joint. S7, asphalt pavement maintenance, uses sand and gravel as the main material, emulsified asphalt as the binder, and adds water and additives to form a maintenance material, which is then spread between the base layer and the surface layer of the highway.

2. The construction method for permeable asphalt pavement using a high-viscosity asphalt modifier according to claim 1, characterized in that: In S2, the paving material needs to be laid evenly and continuously. The paving speed should not be changed arbitrarily or stopped midway. The paving speed is 2 to 6 m / min.

3. The construction method for permeable asphalt pavement using a high-viscosity asphalt modifier according to claim 2, characterized in that: During the paving process in S2, the screw feeder should rotate continuously, and both sides should maintain a mixture of at least 2 / 3 of the feeder height.

4. The construction method for permeable asphalt pavement using a high-viscosity asphalt modifier according to claim 3, characterized in that: In S5, the model construction includes a diffusion model of grouting material in poor interlayer bonding and crack gaps of the pavement, and solving the model yields the pressure field distribution and velocity field distribution of the fluid flow; the calculated Darcy velocity field is coupled with the flow of porous rare matter to obtain the grouting concentration at different locations.

5. The construction method for permeable asphalt pavement using a high-viscosity asphalt modifier according to claim 1, characterized in that: In the S6 process, the road material is laid in two layers during the jointing process. The first layer of road material is inserted under the foam material, and the second layer of road material is pressed on the surface of the foam material. The laying direction is the same each time.

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