Construction method for improving construction flatness of asphalt concrete pavement

Abstract

The invention discloses a construction method for improving construction flatness of an asphalt concrete pavement, and the method comprises the following steps: S1, asphalt gradation optimization pretreatment: spraying an activating agent on the surface of asphalt aggregate for pavement paving to reduce an asphalt adsorption hysteresis effect, S2, mixing parameter regulation and control, and S3, pavement paving. The mixing temperature of the concrete is adjusted according to real-time gas phase data of a pavement construction site, and the mixing temperature is equal to the reference temperature and floats up and down by 3 DEG C, S3, anti-segregation transportation through a transport vehicle, the mixed concrete in the step S2 is transported to the construction site through the transport vehicle, the transport vehicle is provided with a three-dimensional rotating stock bin, the rotating speed ranges from 8 r / min to 12 r / min, and the mixing temperature is adjusted according to the real-time gas phase data of the pavement construction site. The standard deviation of the flatness of the asphalt concrete pavement constructed through the method is smaller than or equal to 0.8 mm, compared with a traditional construction method, the flatness of the asphalt concrete pavement constructed through the method can be improved by 40 degrees, meanwhile, a 200 mm heating belt is reserved in a joint area between the pavements, and the bumping phenomenon at the joint can be reduced by 70%.

Description

Technical Field

[0001] The invention discloses a construction method for improving the construction smoothness of an asphalt concrete pavement, and belongs to the technical field of asphalt concrete pavement construction. Background Art

[0002] Asphalt concrete is a building material made by mixing, blending, and compacting asphalt, mineral materials (such as gravel and sand), and additives. It is primarily used for road paving. It is durable and waterproof, and is often used in highway construction. The main components of asphalt concrete include asphalt, aggregates (such as crushed stone, crushed gravel, stone chips, sand, mineral powder, etc.), and additives. These materials are mixed under strictly controlled conditions to form a dense mixture. The preparation process includes mixing, blending, and compaction to ensure that it has good physical and chemical properties. Asphalt concrete is widely used in road construction, especially in highway pavement, due to its durability and waterproof properties. It can provide a smooth and durable road surface suitable for use in various traffic conditions. Construction smoothness is closely related to pavement service performance and operating costs. Low construction smoothness will affect the durability and life of the pavement after it is opened to traffic. Improving construction smoothness will significantly improve the performance of the pavement. Therefore, improving the construction smoothness of asphalt concrete pavement is of great significance to ensuring pavement quality and reducing operating costs. Based on the above problems, the present invention proposes a construction method for improving the construction smoothness of asphalt concrete pavement. Summary of the Invention

[0003] The purpose of the present invention is to provide a construction method for improving the smoothness of asphalt concrete pavement construction in order to solve the above-mentioned shortcomings.

[0004] S1, asphalt gradation optimization pretreatment, spraying activator on the surface of asphalt aggregate used for road paving to reduce the asphalt adsorption hysteresis effect; S2, mixing parameter control, adjusts the concrete mixing temperature according to the real-time gas phase data at the pavement construction site. The mixing temperature = the base temperature with a fluctuation of 3°C. S3, transport by transport vehicle to prevent segregation. The mixed concrete in step S2 is transported to the construction site by a transport vehicle. The transport vehicle is equipped with a three-dimensional rotating silo with a rotation speed of 8-12 r / min. The three-dimensional rotating silo automatically rotates 90° every 4 km traveled by the transport vehicle. S4, laying the concrete layer of the road surface, leveling the roadbed fill, and compacting it, and then laying the concrete in step S3 on the road base to form the concrete layer of the road surface; S5, grinding the concrete layer. After the hardness of the concrete layer in step S4 meets the requirements, the concrete layer is tested for flatness using a flatness detection device, and locations that do not meet the flatness requirements are marked. The marked locations are then ground using a concrete grinder until the flatness of the entire concrete layer meets the requirements. S6, cleaning the concrete layer. After the concrete layer meets the flatness requirements in step S5, the concrete layer is cleaned to remove dust and debris on the concrete layer to form a concrete support layer. S7, paving the asphalt pavement. After the concrete layer is cleaned, the asphalt mixed aggregate pretreated in step S1 is paved on the concrete sub-layer in step S6; S8, asphalt paving, using a paver to pre-press the asphalt mixture in step S7; S9, measuring the flatness, measuring the flatness of the concrete sub-layer ΔH01 and the flatness of the asphalt paving layer ΔH02; S10, calculating the target virtual paving coefficient, calculating the target virtual paving coefficient K of the paving layer when the flatness of the underlying layer and the flatness of the paving layer are in a balanced state; S11, paving and vibration, the pavement is vibrated by a paver, the vibration frequency is between 40-70 Hz, and the vibration inclination angle is between 0.5-1.4°; S12, cluster initial compaction, using multiple rollers to perform initial compaction on the road surface formed in step S11, with the rollers being followed closely by the paver, with the distance between the rollers and the paver being within 30m; S13, cluster re-compaction, using a tire roller and an oscillating roller to perform combined re-compaction on the road surface initially compacted in step S12, wherein the tire pressure of the tire roller is 0.6-0.8 MPa, and the tires overlap by 1 / 3 of the wheel width; S14, cluster final compaction, using a wide static roller to perform final compaction on the asphalt concrete pavement compacted in step S13 to eliminate wheel marks. The width of the wide static roller is 3.2m. S15, real-time flatness detection, using a vehicle-mounted laser profiler to detect the flatness of the road surface finalized in step S14, with a sampling interval of 0.5-0.8m; S16, micro-defect regeneration and repair, injecting high-temperature regeneration agent into the depressed area detected in step S15.

[0005] Preferably, in step S1, the concentration of the activator sprayed on the asphalt surface aggregate is 0.5-1.2%, and the activator is an asphalt aggregate interface modifier.

[0006] Preferably, the activator sprayed on the asphalt surface in step S1 is sprayed with high-pressure aerosol spraying, the spraying pressure is 0.3-0.5 MPa, and the amount of the activator sprayed is controlled as follows: Q = 0.02A / k, where Q = aggregate density (g / cm 3 ), A = specific surface area (m 2 / g), k=surface roughness coefficient (1.2-1.8).

[0007] Preferably, in step S9, the flatness ΔH01 of the underlying layer to be paved is measured, and the flatness ΔH1 of the forming surface determined by the flatness of the underlying layer is calculated according to formula 1, and the calculation formula 1 is: ΔH1=(1-1 / K)ΔH01 (1).

[0008] Preferably, in step S9, the flatness ΔH02 of the paving layer that has been completed but not yet rolled is measured, and the flatness ΔH2 of the forming surface determined by the flatness of the paving layer is calculated according to formula 2, and the calculation formula 2 is: ΔH2 = (1 / K) ΔH02 (2).

[0009] Preferably, the pressure of the front hydraulic pre-pressing roller of the pre-pressing paver in step S8 is 2-5 MPa.

[0010] Preferably, the roller in step S12 is a double-steel-wheel vibratory roller with a static load of 10 t and an amplitude of 0.8 mm.

[0011] Preferably, a 200 mm heating zone is reserved in the joint area between the road surfaces in step S8, and the temperature gradient is 150°C → 130°C → 110°C.

[0012] Preferably, in step S16, the depth of the recessed area needs to be greater than 2 mm, and the temperature of the injected high-temperature regeneration agent is between 180-200° C.; Preferably, the high-temperature regeneration agent in step S16 is a heat-activated repair agent for micro-damage of asphalt pavement, which is in the form of a thixotropic gel with a viscosity of ≥15000 cP at 25°C and a viscosity reduced to 250±50 cP at 180°C.

[0013] Compared with the prior art, the present invention has the following beneficial effects: The present invention relates to a construction method for improving the smoothness of asphalt concrete pavement construction. During the construction of the asphalt concrete pavement, the asphalt is first pretreated. The asphalt pretreatment adopts an asphalt aggregate interface modifier for spraying at a spraying pressure of 0.3-0.5 MPa. By pretreating the asphalt, the asphalt adsorption hysteresis effect can be effectively reduced. After the road is paved, the infiltration time can be effectively shortened, the fluidity of the mixture is made more uniform, the paving segregation index is effectively reduced, and the structural durability of the asphalt concrete pavement can be effectively improved. At the same time, the adhesion and rutting resistance can be increased, thereby improving the long-term service stability of the asphalt concrete pavement. The asphalt concrete pavement constructed using the method of the present invention has a flatness standard deviation of ≤0.8mm. Compared with traditional construction methods, this method can improve the flatness by 40°. At the same time, by reserving a 200mm heating zone in the joint area between the pavements, the temperature gradient is 150℃→130℃→110℃, which can reduce the vehicle jumping phenomenon at the joint by 70%, effectively improving the pavement flatness effect and improving road driving safety. The present invention adopts triple cluster compaction, namely cluster initial compaction, cluster re-compaction and cluster final compaction, which can effectively improve the compaction degree and compaction uniformity of the pavement. Finally, the asphalt pavement micro-damage heat-activated repair agent is used to regenerate and repair micro-defects, which can effectively alleviate the flatness defect problem caused by the mismatch of rolling parameters, and the regeneration and repair effect is better and the maintenance cost is lower. DETAILED DESCRIPTION

[0014] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0015] Example 1: A construction method for improving the smoothness of asphalt concrete pavement construction, characterized in that the method comprises the following steps: S1, asphalt gradation optimization pretreatment, spraying activator on the surface of asphalt aggregate used for road paving to reduce the asphalt adsorption hysteresis effect; S2, mixing parameter control, adjusts the concrete mixing temperature according to the real-time gas phase data at the pavement construction site. The mixing temperature = the base temperature with a fluctuation of 3°C. S3, transport by transport vehicle to prevent segregation. The mixed concrete in step S2 is transported to the construction site by a transport vehicle. The transport vehicle is equipped with a three-dimensional rotating silo with a rotation speed of 8-12 r / min. The three-dimensional rotating silo automatically rotates 90° every 4 km traveled by the transport vehicle. S4, laying the concrete layer of the road surface, leveling the roadbed fill, and compacting it, and then laying the concrete in step S3 on the road base to form the concrete layer of the road surface; S5, grinding the concrete layer. After the hardness of the concrete layer in step S4 meets the requirements, the concrete layer is tested for flatness using a flatness detection device, and locations that do not meet the flatness requirements are marked. The marked locations are then ground using a concrete grinder until the flatness of the entire concrete layer meets the requirements. S6, cleaning the concrete layer. After the concrete layer meets the flatness requirements in step S5, the concrete layer is cleaned to remove dust and debris on the concrete layer to form a concrete support layer. S7, paving the asphalt pavement. After the concrete layer is cleaned, the asphalt mixed aggregate pretreated in step S1 is paved on the concrete sub-layer in step S6; S8, asphalt paving, using a paver to pre-press the asphalt mixture in step S7; S9, measuring the flatness, measuring the flatness of the concrete sub-layer ΔH01 and the flatness of the asphalt paving layer ΔH02; S10, calculating the target virtual paving coefficient, calculating the target virtual paving coefficient K of the paving layer when the flatness of the underlying layer and the flatness of the paving layer are in a balanced state; S11, paving and vibration, the pavement is vibrated by a paver, the vibration frequency is between 40-70 Hz, and the vibration inclination angle is between 0.5-1.4°; S12, cluster initial compaction, using multiple rollers to perform initial compaction on the road surface formed in step S11, with the rollers being followed closely by the paver, with the distance between the rollers and the paver being within 30m; S13, cluster re-compaction, using a tire roller and an oscillating roller to perform combined re-compaction on the road surface initially compacted in step S12, wherein the tire pressure of the tire roller is 0.6-0.8 MPa, and the tires overlap by 1 / 3 of the wheel width; S14, cluster final compaction, using a wide static roller to perform final compaction on the asphalt concrete pavement compacted in step S13 to eliminate wheel marks. The width of the wide static roller is 3.2m. S15, real-time flatness detection, using a vehicle-mounted laser profiler to detect the flatness of the road surface finalized in step S14, with a sampling interval of 0.5-0.8m; S16, micro-defect regeneration and repair, injecting high-temperature regeneration agent into the depressed area detected in step S15.

[0016] In this embodiment, in step S1, the concentration of the activator sprayed on the asphalt surface aggregate is 0.5-1.2%, and the activator is an asphalt aggregate interface modifier.

[0017] In this embodiment, the activator sprayed on the asphalt surface in step S1 is sprayed by high-pressure aerosol spraying, the spraying pressure is 0.3-0.5 MPa, and the amount of the activator sprayed is controlled as follows: Q = 0.02A / k, where Q = aggregate density (g / cm 3 ), A = specific surface area (m 2 / g), k=surface roughness coefficient (1.2-1.8).

[0018] In this embodiment, in step S9, the flatness ΔH01 of the underlying layer to be paved is measured, and the flatness ΔH1 of the forming surface determined by the flatness of the underlying layer is calculated according to formula 1, and the calculation formula 1 is: ΔH1 = (1-1 / K) ΔH01 (1).

[0019] In this embodiment, in step S9, the flatness ΔH02 of the paving layer that has been paved but not yet rolled is measured, and the flatness ΔH2 of the forming surface determined by the flatness of the paving layer is calculated according to formula 2, and the calculation formula 2 is: ΔH2 = (1 / K) ΔH02 (2).

[0020] In this embodiment, the pressure of the front hydraulic pre-pressing roller of the pre-pressing paver in step S8 is 2-5 MPa.

[0021] In this embodiment, the roller in step S12 is a double-steel-wheel vibratory roller with a static load of 10 t and an amplitude of 0.8 mm.

[0022] In this embodiment, a 200 mm heating zone is reserved in the joint area between the road surfaces in step S8, and the temperature gradient is 150°C → 130°C → 110°C.

[0023] In this embodiment, in step S16, the depth of the recessed area needs to be greater than 2 mm, and the temperature of the injected high-temperature regeneration agent is between 180-200°C.

[0024] In this embodiment, the high-temperature regeneration agent in step S16 is a heat-activated repair agent for micro-damage of asphalt pavement, which is in the form of a thixotropic gel with a viscosity of ≥15000 cP at 25°C and a viscosity reduced to 250±50 cP at 180°C.

[0025] The present invention relates to a construction method for improving the smoothness of asphalt concrete pavement construction. During the construction of the asphalt concrete pavement, the asphalt is first pretreated. The asphalt pretreatment adopts an asphalt aggregate interface modifier for spraying at a spraying pressure of 0.3-0.5 MPa. By pretreating the asphalt, the asphalt adsorption hysteresis effect can be effectively reduced. After the road is paved, the infiltration time can be effectively shortened, the fluidity of the mixture is made more uniform, the paving segregation index is effectively reduced, and the structural durability of the asphalt concrete pavement can be effectively improved. At the same time, the adhesion and rutting resistance can be increased, thereby improving the long-term service stability of the asphalt concrete pavement. The asphalt concrete pavement constructed using the method of the present invention has a flatness standard deviation of ≤0.8mm. Compared with traditional construction methods, this method can improve the flatness by 40°. At the same time, by reserving a 200mm heating zone in the joint area between the pavements, the temperature gradient is 150℃→130℃→110℃, which can reduce the vehicle jumping phenomenon at the joint by 70%, effectively improving the pavement flatness effect and improving road driving safety. The present invention adopts triple cluster compaction, namely cluster initial compaction, cluster re-compaction and cluster final compaction, which can effectively improve the compaction degree and compaction uniformity of the pavement. Finally, the asphalt pavement micro-damage heat-activated repair agent is used to regenerate and repair micro-defects, which can effectively alleviate the flatness defect problem caused by the mismatch of rolling parameters, and the regeneration and repair effect is better and the maintenance cost is lower.

[0026] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A construction method for improving the smoothness of asphalt concrete pavement construction, characterized by: The method comprises the following steps: S1, asphalt gradation optimization pretreatment, spraying activator on the surface of asphalt aggregate used for road paving to reduce the asphalt adsorption hysteresis effect; S2, mixing parameter control, adjust the concrete mixing temperature according to the real-time gas phase data at the pavement construction site, mixing temperature = reference temperature ± 3°C; S3, transport by transport vehicle to prevent segregation. The mixed concrete in step S2 is transported to the construction site by a transport vehicle. The transport vehicle is equipped with a three-dimensional rotating silo with a rotation speed of 8-12 r / min. The three-dimensional rotating silo automatically rotates 90° every 4 km traveled by the transport vehicle. S4, laying the concrete layer of the road surface, leveling the roadbed fill, and compacting it, and then laying the concrete in step S3 on the road base to form the concrete layer of the road surface; S5, grinding the concrete layer. After the hardness of the concrete layer in step S4 meets the requirements, the concrete layer is tested for flatness using a flatness detection device, and locations that do not meet the flatness requirements are marked. The marked locations are then ground using a concrete grinder until the flatness of the entire concrete layer meets the requirements. S6, cleaning the concrete layer. After the concrete layer meets the flatness requirements in step S5, the concrete layer is cleaned to remove dust and debris on the concrete layer to form a concrete support layer. S7, paving the asphalt pavement. After the concrete layer is cleaned, the asphalt mixed aggregate pretreated in step S1 is paved on the concrete sub-layer in step S6; S8, asphalt paving, using a paver to pre-press the asphalt mixture in step S7; S9, measuring the flatness, measuring the flatness of the concrete sub-layer ΔH01 and the flatness of the asphalt paving layer ΔH02; S10, calculating the target virtual paving coefficient, calculating the target virtual paving coefficient K of the paving layer when the flatness of the underlying layer and the flatness of the paving layer are in a balanced state; S11, paving and vibration, the pavement is vibrated by a paver, the vibration frequency is between 40-70 Hz, and the vibration inclination angle is between 0.5-1.4°; S12, cluster initial compaction, using multiple rollers to perform initial compaction on the road surface formed in step S11, with the rollers being followed closely by the paver, with the distance between the rollers and the paver being within 30m; S13, cluster re-compaction, using a tire roller and an oscillating roller to perform combined re-compaction on the road surface initially compacted in step S12, wherein the tire pressure of the tire roller is 0.6-0.8 MPa, and the tires overlap by 1 / 3 of the wheel width; S14, cluster final compaction, using a wide static roller to perform final compaction on the asphalt concrete pavement compacted in step S13 to eliminate wheel marks. The width of the wide static roller is 3.2m. S15, real-time flatness detection, using a vehicle-mounted laser profiler to detect the flatness of the road surface finalized in step S14, with a sampling interval of 0.5-0.8m; S16, micro-defect regeneration and repair, injecting high-temperature regeneration agent into the depressed area detected in step S15.

2. A construction method for improving the smoothness of asphalt concrete pavement construction according to claim 1, characterized in that: In step S1, the concentration of the activator sprayed on the asphalt surface aggregate is 0.5-1.2%, and the activator is an asphalt aggregate interface modifier.

3. A construction method for improving the smoothness of asphalt concrete pavement construction according to claim 1, characterized in that: The activator sprayed on the asphalt surface in step S1 is sprayed by high-pressure aerosol spraying, with a spraying pressure of 0.3-0.5 MPa, and the amount of the activator sprayed is controlled as follows: Q = 0.02A / k, where Q = aggregate density (g / cm 3 ), A = specific surface area (m 2 / g), k=surface roughness coefficient (1.2-1.8).

4. A construction method for improving the smoothness of asphalt concrete pavement construction according to claim 3, characterized in that: In step S9, the flatness ΔH01 of the underlying layer to be paved is measured, and the flatness ΔH1 of the forming surface determined by the flatness of the underlying layer is calculated according to formula 1, which is: ΔH1 = (1-1 / K) ΔH01 (1).

5. The method for improving the smoothness of asphalt concrete pavement construction according to claim 1, characterized in that: In step S9, the flatness ΔH02 of the paving layer that has been paved but not yet rolled is measured, and the flatness ΔH2 of the forming surface determined by the flatness of the paving layer is calculated according to formula 2, which is: ΔH2 = (1 / K) ΔH02 (2).

6. A construction method for improving the smoothness of asphalt concrete pavement construction according to claim 1, characterized in that: The pressure of the front hydraulic pre-pressing roller of the pre-pressing paver in step S8 is 2-5 MPa.

7. A construction method for improving the smoothness of asphalt concrete pavement construction according to claim 1, characterized in that: The roller in step S12 is a double-steel-wheel vibratory roller with a static load of 10 t and an amplitude of 0.8 mm.

8. The method for improving the smoothness of asphalt concrete pavement construction according to claim 1, characterized in that: In step S8, a 200 mm heating zone is reserved in the joint area between the pavements, and the temperature gradient is 150°C → 130°C → 110°C.

9. The method for improving the smoothness of asphalt concrete pavement construction according to claim 1, characterized in that: In step S16, the depth of the recessed area needs to be greater than 2 mm, and the temperature of the injected high-temperature regeneration agent needs to be between 180° C. and 200° C.

10. The method for improving the smoothness of asphalt concrete pavement construction according to claim 1, characterized in that: The high-temperature regeneration agent in step S16 is a heat-activated repair agent for micro-damage of asphalt pavement, and is in the form of a thixotropic gel, with a viscosity of ≥15000 cP at 25°C and a viscosity reduced to 250±50 cP at 180°C.