On-site forming method for colored permeable asphalt concrete in sponge city

Abstract

The invention discloses an on-site forming method for colored permeable asphalt concrete in a sponge city. The on-site forming method comprises the following steps: step 1, paving a first bottom permeable water-stable layer; step 2, rolling and curing the first bottom layer water-permeable water-stable layer; step 3, paving, rolling and curing a second bottom water-permeable water-stable layer; and step 4, paving and rolling the surface layer colored water-permeable asphalt. The method is reasonable in design, the working performance of the water-stable layer and the surface permeable asphalt layer is optimized by adjusting the construction technology of the bottom permeable water-stable layer and the permeable asphalt, so that the strength of the permeable asphalt concrete is ensured, and the permeable coefficient is not influenced; the permeable coefficient of the colored permeable asphalt concrete and the strength of the permeable asphalt concrete are qualified, so that the requirements of sponge city construction are met.

Description

Technical Field

[0001] The present invention belongs to the technical field of road paving, and in particular relates to an on-site forming method of colored permeable asphalt concrete for sponge cities. Background Art

[0002] Sponge cities are a new generation of urban stormwater management concepts, enabling cities to adapt to environmental changes and respond to natural disasters caused by rainwater, just like a sponge. Permeable asphalt concrete is becoming increasingly popular in sponge city construction, with more and more urban roads being constructed with permeable asphalt concrete pavements.

[0003] During rainfall, rainwater on the road surface seeps into the bottom of the structural layer through the internal interconnecting holes of the permeable asphalt concrete and is systematically drained out through pre-buried blind pipes in the base layer, effectively alleviating urban waterlogging and preventing water accumulation on the road surface. However, permeable asphalt concrete roads have driving pressure requirements. For pavements with a high permeability coefficient, the permeable asphalt concrete strength is difficult to reach the design strength. For roads with permeable asphalt concrete strength that meets the required design, the permeability coefficient is also difficult to meet the design requirements. In addition, for the aesthetics of urban roads, colored permeable asphalt concrete is also needed. Colored permeable asphalt concrete combines ecological and environmental protection functions with landscape decorative effects, thereby enhancing urban landscaping.

[0004] Therefore, a rationally designed on-site forming method for colored permeable asphalt concrete in sponge cities is needed, which is convenient to construct, does not affect the permeability of asphalt concrete, and can ensure the strength of permeable asphalt concrete to meet the needs of sponge city construction. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a sponge city colored permeable asphalt concrete on-site forming method in response to the deficiencies in the above-mentioned existing technology. The method has a reasonable design and optimizes the working performance of the water-stabilizing layer and the surface permeable asphalt layer by adjusting the bottom permeable water-stabilizing layer and the permeable asphalt construction process, thereby ensuring the strength of the permeable asphalt concrete without affecting the permeability coefficient, ensuring that the permeability coefficient and strength of the colored permeable asphalt concrete are qualified, so as to meet the needs of sponge city construction.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is: a method for on-site forming of colored permeable asphalt concrete in sponge cities, characterized in that the method comprises the following steps: Step 1: Pave the first bottom permeable water-stabilizing layer: Use a paver to evenly spread the mixed permeable water-stabilizing material on the surface of the gravel layer to form the first bottom permeable water-stabilizing layer; Step 2: Compacting and curing the first bottom permeable water-stabilizing layer: Step 201: Use an 18T vibratory roller to vibrate and compact the first bottom permeable water-stabilizing layer; Step 202: Perform a density test on the compacted first bottom permeable water-stable layer until the density of the compacted first bottom permeable water-stable layer is greater than or equal to a set density value. Step 203: Covering the first bottom permeable water-stabilizing layer after rolling with geotextile and sprinkling water for curing; Step 204: Testing the laying thickness, water permeability, and compressive strength of the first bottom permeable water-stabilizing layer after curing until the laying thickness, water permeability, and compressive strength meet the design values of laying thickness, water permeability, and compressive strength, respectively, to form a first permeable water-stabilizing layer; Step 3: Paving, rolling and curing of the second bottom permeable water-stabilizing layer: According to the method of step 2, the mixed permeable water-stabilizing material is evenly spread on the first permeable water-stabilizing layer, and rolled and cured to form a second permeable water-stabilizing layer; Step 4: Paving and rolling of colored permeable asphalt surface layer: Step 401: Clean the surface of the second permeable water-stabilizing layer and spray emulsified asphalt to form an emulsified asphalt layer; Step 402: Use a paver to evenly spread the lower layer of permeable asphalt mixture on the emulsified asphalt layer to form a lower layer of permeable asphalt layer; Step 403: rolling the lower permeable asphalt layer; Step 404: Using a paver, evenly spread the permeable asphalt mixture on the compacted lower permeable asphalt layer to form an upper permeable asphalt layer. Step 405: rolling the upper permeable asphalt layer according to the method of step 403; Step 406: spray colored paint on the upper permeable asphalt layer after rolling to form colored permeable asphalt concrete.

[0007] The above-mentioned on-site forming method of colored permeable asphalt concrete for sponge cities is characterized by: step 1, the specific process is as follows: Step 101: Clean, level, and compact the soil or gravel foundation to ensure that the flatness and compaction of the foundation meet or exceed the construction design requirements. Step 102: Sprinkle water on the base surface to keep it moisturized; Step 103: Laying graded crushed stones on the foundation surface to form a crushed stone layer; Step 104: Use a paver to evenly spread the mixed permeable water-stabilizing material on the surface of the gravel layer to form a first bottom permeable water-stabilizing layer; wherein the thickness of the first bottom permeable water-stabilizing layer is β times the design value of the laying thickness, β is a correction coefficient, and β is 1.2 to 1.35.

[0008] The above-mentioned method for on-site forming of colored permeable asphalt concrete for sponge cities is characterized in that: in step 201, an 18T vibratory roller is used to vibrate and compact the first bottom permeable water-stabilizing layer. The specific process is as follows: Step 2011: Use a single steel wheel roller to statically press the first bottom permeable water-stabilizing layer 1 to 2 times at a speed of 1.5 km / h to 1.7 km / h; Step 2012: Use an 18T vibratory roller to vibrate and compact the first bottom permeable water-stabilizing layer 2 to 4 times; wherein the 18T vibratory roller has a travel speed of 2.0 km / h to 2.5 km / h; Step 2013: Use a rubber-wheel roller to roll the first bottom permeable water-stabilizing layer 1 to 2 times.

[0009] The above-mentioned method for on-site forming of colored permeable asphalt concrete for sponge cities is characterized in that: step 202, the specific process is as follows: Step 2021: Using a ring knife method, sample the first bottom permeable water-stabilizing layer after rolling to obtain a first core sample, and test the density of the first core sample. If the density of the first core sample is less than the density setting value, execute step 2022; if the density of the first core sample is greater than or equal to the density setting value, execute step 2023; Step 2022: backfill the holes left by the coring with the mixed permeable water-stabilizing material, and repeat step 201 until the density of the first core sample is greater than or equal to the density setting value, and then execute step 2023; Step 2023: backfill the mixed permeable water-stabilizing material into the hole left by the coring, and use a rammer to compact the backfilled permeable water-stabilizing material until the density of the backfilled permeable water-stabilizing material is greater than or equal to the density setting value.

[0010] The above-mentioned method for on-site forming of colored permeable asphalt concrete for sponge cities is characterized in that: step 204, the specific process is as follows: Step 2041: Use a core drill to drill a core sample from the first bottom permeable water-stabilizing layer after curing to obtain a second core sample. Obtain the water permeability and compressive strength of the second core sample as the water permeability and compressive strength of the first permeable water-stabilizing layer, respectively. Compare the water permeability and compressive strength of the first permeable water-stabilizing layer with the design water permeability and compressive strength, respectively. If the design water permeability and compressive strength values are met, execute steps 2042 and 2043. If the design water permeability and compressive strength values are not met, crush and remove the first bottom permeable water-stabilizing layer, and repeat step 1. Step 2042: Obtain the height of the second core sample as the thickness L1 of the first permeable water-stabilizing layer. If the thickness L1 of the first permeable water-stabilizing layer satisfies the range of 0.95Ls to 1.05Ls, proceed to step 2044; if the thickness L1 of the first permeable water-stabilizing layer does not meet the range of 0.95Ls to 1.05Ls, proceed to step 2043; wherein Ls represents the design value of the laying thickness. Step 2043: If L1 is less than Ls, according to Lb=Ls-L1, obtain the additional compensation thickness Lb; and obtain the thickness of the second bottom permeable water-stabilizing layer as β(Ls+Lb); If L1 is greater than Ls, according to Lb'=L1-Ls, the reduced compensation thickness Lb' is obtained; and the thickness of the second bottom permeable water-stabilizing layer is obtained as β(Ls-Lb'); Step 2044: Obtain the thickness of the second bottom permeable water-stabilizing layer as βLs.

[0011] The above-mentioned method for on-site forming of colored permeable asphalt concrete for sponge cities is characterized in that: in step 404, the lower permeable asphalt layer is rolled, and the specific process is as follows: Step 4011: When the temperature of the lower permeable asphalt layer drops to 150° C. to 155° C., use a double steel wheel roller to statically press the lower permeable asphalt layer twice at a speed of 1.5 km / h to 1.7 km / h. Step 4012: Use an 18T vibratory roller to vibrate and roll the lower permeable asphalt layer 2 to 4 times; wherein the 18T vibratory roller has a travel speed of 2.0 km / h to 2.5 km / h; Step 4013: When the temperature of the lower permeable asphalt layer drops to 130° C. to 135° C., use a rubber-wheel roller to roll the lower permeable asphalt layer 2 to 4 times; wherein the travel speed of the rubber-wheel roller is 2.0 km / h to 2.5 km / h; Step 4014: When the temperature of the lower permeable asphalt layer drops to 90°C to 95°C, use a double steel wheel roller to statically press the lower permeable asphalt layer twice to eliminate wheel marks.

[0012] The above-mentioned on-site forming method of colored permeable asphalt concrete in a sponge city is characterized in that the permeable water-stabilizing material is prepared from cement, water and residual aggregate, and the aggregate includes a first aggregate with a particle size of [0.075~4.75) , a second aggregate with a particle size of [4.75~9.5mm) , a third aggregate with a particle size of [9.5~16.0mm) and a fourth aggregate with a particle size of [16.0~31.5mm) .

[0013] The above-mentioned on-site forming method of colored permeable asphalt concrete for sponge cities is characterized in that: the upper layer of permeable asphalt mixture is 90# Grade A asphalt, and the asphalt-to-stone ratio of the upper layer of permeable asphalt mixture is 4.4%; The mineral material of the upper layer of permeable asphalt mixture is prepared by mineral powder, fine aggregate with a particle size of [0.075-5mm), a first group of aggregate with a particle size of [5-10mm] and a second group of aggregate with a particle size of [10-15mm]. The permeable asphalt mixture for paving the lower layer is prepared from aggregate 1 with a particle size of [2.36mm~4.75mm), aggregate 2 with a particle size of [4.75mm~9.5mm), aggregate 3 with a particle size of [9.5mm~13.2mm), aggregate 4 with a particle size of [13.2mm~16mm), aggregate 5 with a particle size of [16mm~19mm), aggregate 6 with a particle size of [19mm~26.5mm), and mineral powder.

[0014] The above-mentioned method for on-site forming of colored permeable asphalt concrete for sponge cities is characterized in that: step 406, the specific process is as follows: Step 4061: Mix the color paint and the curing agent, stir thoroughly until uniform, and let stand to defoam; Step 4062: Use an airless sprayer to spray the mixed colored paint onto the upper permeable asphalt layer to form colored permeable asphalt concrete.

[0015] Compared with the prior art, the present invention has the following advantages: 1. The method of the present invention has simple steps and reasonable design, and solves the current problem of ensuring that the compressive strength grade of permeable concrete meets the design requirements while improving the permeability coefficient.

[0016] 2. This method improves the construction process of permeable asphalt concrete. First, the first bottom permeable water-stabilizing layer and the second bottom permeable water-stabilizing layer are paved, rolled and maintained to ensure that the design values of permeability and compressive strength are met. Then, the surface layer of colored permeable asphalt is paved and rolled. The construction is convenient and simple, and the permeability coefficient and compressive strength quality are guaranteed.

[0017] 3. When paving the first bottom permeable water-stabilizing layer and the second bottom permeable water-stabilizing layer, this method also judges the thickness of the finally formed permeable water-stabilizing layer. By compensating for the insufficient or excessive paving thickness of the lower permeable water-stabilizing layer through the upper permeable water-stabilizing layer, the accuracy of the construction thickness is improved, thereby ensuring the overall performance of the road construction.

[0018] 4. When paving and rolling the colored permeable asphalt surface layer according to this method, the lower layer of permeable asphalt mixture and the upper layer of permeable asphalt mixture are paved and rolled. This is because the particle sizes of the mineral materials in the upper and lower layers of permeable asphalt mixture are different, and they have both high permeability coefficient and compressive strength to meet the requirements of the road surface layer.

[0019] 5. The high-strength permeable concrete used in this method for the pavement surface layer has simple construction, reasonable design, and low cost. It meets the requirements of the pavement surface layer and is suitable for promotion in the construction of various sponge city roads.

[0020] 6. This method is suitable for the formation of permeable concrete pavement for low-load roads in sponge cities and the formation of permeable concrete for parking lots, sidewalks, parks and squares.

[0021] To sum up, the present invention is reasonably designed. By adjusting the bottom permeable water-stabilizing layer and the permeable asphalt grading, the working performance of the water-stabilizing layer and the surface permeable asphalt layer is optimized, thereby ensuring the strength of the permeable asphalt concrete without affecting the permeability coefficient, ensuring that the permeability coefficient and strength of the permeable asphalt concrete are qualified, so as to meet the needs of sponge city construction.

[0022] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 Schematic diagram of the method of the present invention. DETAILED DESCRIPTION

[0024] The present invention provides a method for on-site forming of colored permeable asphalt concrete for sponge cities, the method comprising the following steps: Step 1: Pave the first bottom permeable water-stabilizing layer: Use a paver to evenly spread the mixed permeable water-stabilizing material on the surface of the gravel layer to form the first bottom permeable water-stabilizing layer; Step 2: Compacting and curing the first bottom permeable water-stabilizing layer: Step 201: Use an 18T vibratory roller to vibrate and compact the first bottom permeable water-stabilizing layer; Step 202: Perform a density test on the compacted first bottom permeable water-stable layer until the density of the compacted first bottom permeable water-stable layer is greater than or equal to a set density value. Step 203: Covering the first bottom permeable water-stabilizing layer after rolling with geotextile and sprinkling water for curing; Step 204: Testing the laying thickness, water permeability, and compressive strength of the first bottom permeable water-stabilizing layer after curing until the laying thickness, water permeability, and compressive strength meet the design values of laying thickness, water permeability, and compressive strength, respectively, to form a first permeable water-stabilizing layer; Step 3: Paving, rolling and curing of the second bottom permeable water-stabilizing layer: According to the method of step 2, the mixed permeable water-stabilizing material is evenly spread on the first permeable water-stabilizing layer, and rolled and cured to form a second permeable water-stabilizing layer; Step 4: Paving and rolling of colored permeable asphalt surface layer: Step 401: Clean the surface of the second permeable water-stabilizing layer and spray emulsified asphalt to form an emulsified asphalt layer; Step 402: Use a paver to evenly spread the lower layer of permeable asphalt mixture on the emulsified asphalt layer to form a lower layer of permeable asphalt layer; Step 403: rolling the lower permeable asphalt layer; Step 404: Using a paver, evenly spread the permeable asphalt mixture on the compacted lower permeable asphalt layer to form an upper permeable asphalt layer. Step 405: rolling the upper permeable asphalt layer according to the method of step 403; Step 406: spray colored paint on the upper permeable asphalt layer after rolling to form colored permeable asphalt concrete.

[0025] In this embodiment, the specific process of step one is as follows: Step 101: Clean, level, and compact the soil or gravel foundation to ensure that the flatness and compaction of the foundation meet or exceed the construction design requirements. Step 102: Sprinkle water on the base surface to keep it moisturized; Step 103: Laying graded crushed stones on the foundation surface to form a crushed stone layer; Step 104: Use a paver to evenly spread the mixed permeable water-stabilizing material on the surface of the gravel layer to form a first bottom permeable water-stabilizing layer; wherein the thickness of the first bottom permeable water-stabilizing layer is β times the design value of the laying thickness, β is a correction coefficient, and β is 1.2 to 1.35.

[0026] In this embodiment, in step 201, an 18T vibratory roller is used to vibrate and compact the first bottom permeable water-stabilizing layer. The specific process is as follows: Step 2011: Use a single steel wheel roller to statically press the first bottom permeable water-stabilizing layer 1 to 2 times at a speed of 1.5 km / h to 1.7 km / h; Step 2012: Use an 18T vibratory roller to vibrate and compact the first bottom permeable water-stabilizing layer 2 to 4 times; wherein the 18T vibratory roller has a travel speed of 2.0 km / h to 2.5 km / h; Step 2013: Use a rubber-wheel roller to roll the first bottom permeable water-stabilizing layer 1 to 2 times.

[0027] In this embodiment, the specific process of step 202 is as follows: Step 2021: Using a ring knife method, sample the first bottom permeable water-stabilizing layer after rolling to obtain a first core sample, and test the density of the first core sample. If the density of the first core sample is less than the density setting value, execute step 2022; if the density of the first core sample is greater than or equal to the density setting value, execute step 2023; Step 2022: backfill the holes left by the coring with the mixed permeable water-stabilizing material, and repeat step 201 until the density of the first core sample is greater than or equal to the density setting value, and then execute step 2023; Step 2023: backfill the mixed permeable water-stabilizing material into the hole left by the coring, and use a rammer to compact the backfilled permeable water-stabilizing material until the density of the backfilled permeable water-stabilizing material is greater than or equal to the density setting value.

[0028] In this embodiment, the specific process of step 204 is as follows: Step 2041: Use a core drill to drill a core sample from the first bottom permeable water-stabilizing layer after curing to obtain a second core sample. Obtain the water permeability and compressive strength of the second core sample as the water permeability and compressive strength of the first permeable water-stabilizing layer, respectively. Compare the water permeability and compressive strength of the first permeable water-stabilizing layer with the design water permeability and compressive strength, respectively. If the design water permeability and compressive strength values are met, execute steps 2042 and 2043. If the design water permeability and compressive strength values are not met, crush and remove the first bottom permeable water-stabilizing layer, and repeat step 1. Step 2042: Obtain the height of the second core sample as the thickness L1 of the first permeable water-stabilizing layer. If the thickness L1 of the first permeable water-stabilizing layer satisfies the range of 0.95Ls to 1.05Ls, proceed to step 2044; if the thickness L1 of the first permeable water-stabilizing layer does not meet the range of 0.95Ls to 1.05Ls, proceed to step 2043; wherein Ls represents the design value of the laying thickness. Step 2043: If L1 is less than Ls, according to Lb=Ls-L1, obtain the additional compensation thickness Lb; and obtain the thickness of the second bottom permeable water-stabilizing layer as β(Ls+Lb); If L1 is greater than Ls, according to Lb'=L1-Ls, the reduced compensation thickness Lb' is obtained; and the thickness of the second bottom permeable water-stabilizing layer is obtained as β(Ls-Lb'); Step 2044: Obtain the thickness of the second bottom permeable water-stabilizing layer as βLs.

[0029] In this embodiment, in step 404, the lower permeable asphalt layer is rolled, and the specific process is as follows: Step 4011: When the temperature of the lower permeable asphalt layer drops to 150° C. to 155° C., use a double steel wheel roller to statically press the lower permeable asphalt layer twice at a speed of 1.5 km / h to 1.7 km / h. Step 4012: Use an 18T vibratory roller to vibrate and roll the lower permeable asphalt layer 2 to 4 times; wherein the 18T vibratory roller has a travel speed of 2.0 km / h to 2.5 km / h; Step 4013: When the temperature of the lower permeable asphalt layer drops to 130° C. to 135° C., use a rubber-wheel roller to roll the lower permeable asphalt layer 2 to 4 times; wherein the travel speed of the rubber-wheel roller is 2.0 km / h to 2.5 km / h; Step 4014: When the temperature of the lower permeable asphalt layer drops to 90°C to 95°C, use a double steel wheel roller to statically press the lower permeable asphalt layer twice to eliminate wheel marks.

[0030] In this embodiment, the permeable water-stabilizing material is prepared by cement, water and residual aggregate, and the aggregate includes a first aggregate with a particle size of [0.075~4.75) , a second aggregate with a particle size of [4.75~9.5mm) , a third aggregate with a particle size of [9.5~16.0mm) and a fourth aggregate with a particle size of [16.0~31.5mm) .

[0031] In this embodiment, the upper layer of permeable asphalt mixture is 90# Grade A asphalt, and the oil-to-stone ratio of the upper layer of permeable asphalt mixture is 4.4%; The mineral material of the upper layer of permeable asphalt mixture is prepared by mineral powder, fine aggregate with a particle size of [0.075-5mm), a first group of aggregate with a particle size of [5-10mm] and a second group of aggregate with a particle size of [10-15mm]. The permeable asphalt mixture for paving the lower layer is prepared from aggregate 1 with a particle size of [2.36mm~4.75mm), aggregate 2 with a particle size of [4.75mm~9.5mm), aggregate 3 with a particle size of [9.5mm~13.2mm), aggregate 4 with a particle size of [13.2mm~16mm), aggregate 5 with a particle size of [16mm~19mm), aggregate 6 with a particle size of [19mm~26.5mm), and mineral powder.

[0032] In this embodiment, the specific process of step 406 is as follows: Step 4061: Mix the color paint and the curing agent, stir thoroughly until uniform, and let stand to defoam; Step 4062: Use an airless sprayer to spray the mixed colored paint onto the upper permeable asphalt layer to form colored permeable asphalt concrete.

[0033] In this embodiment, in actual use, the flatness required by the construction design in step 101 is 2‰, and the compaction required by the construction design is 95%.

[0034] In this embodiment, in the specific implementation, in step 102, when water is sprayed on the foundation surface for moisturizing, the water is sprayed evenly and it is ensured that there is no water accumulation on the foundation surface. In actual use, 7.6 liters of water are sprayed per square meter of the foundation surface.

[0035] In this embodiment, during specific implementation, in step 103, the thickness of the crushed stone layer is 20 cm, and the particle size of the graded crushed stone is 4.75 mm to 31.5 mm.

[0036] In this embodiment, during specific implementation, the density setting value in step 202 is 97%, and watering and curing are carried out for 7 days in step 203.

[0037] In this embodiment, the designed laying thickness Ls is 18 cm.

[0038] In this embodiment, during the specific implementation, before performing step 401, an emulsified asphalt layer test section is first carried out on the permeable water-stabilizing layer. Three days later, water is sprayed on the emulsified asphalt layer test section until the sprayed water seeps through the emulsified asphalt layer test section. In this case, the emulsified asphalt layer does not affect water permeability.

[0039] In this embodiment, during specific implementation, the amount of emulsified asphalt used in step 401 is 0.7L / m² to 1.5L / m², and the penetration depth is ≥5mm.

[0040] In this embodiment, during the specific implementation, the paving temperature of the lower layer of permeable asphalt mixture in step 402 is 160°C to 165°C, the speed of the paver is 2m / min to 6m / min; the thickness of the lower layer of permeable asphalt after rolling is 6cm. In step 404, the paving temperature of the upper layer of permeable asphalt mixture is 170°C to 175°C, and the speed of the paver is 2 to 6 m / min; the thickness of the upper layer of permeable asphalt after rolling is 5 cm. In this embodiment, during specific implementation, the permeable water-stabilizing material is prepared by 12.0% to 13.0% by mass of cement, 5.5% by mass of water and the remaining aggregate.

[0041] Taking the 7d unconfined compressive strength design value Rd≥3.0MPa, according to the unconfined compressive strength test results and the linear regression curve of the unconfined compressive strength and its corresponding ash content, and combined with the minimum dosage requirement of inorganic binder cement, it is further preferred that the permeable water-stabilizing material is prepared with 12.0% by mass of cement, 5.5% by mass of water and remaining aggregate.

[0042] In this embodiment, during specific implementation, the cement is P·O42.5 cement.

[0043] In this embodiment, during specific implementation, the mass percentages of the first aggregate, the second aggregate, the third aggregate and the fourth aggregate of the permeable water-stabilizing material are 20%, 30%, 35% and 15% respectively.

[0044] In this embodiment, during specific implementation, the mass percentages of mineral powder, fine aggregate, first group of aggregates and second group of aggregates in the mineral materials of the upper layer of permeable asphalt mixture are 6%, 10%, 36% and 48% respectively.

[0045] In this embodiment, during implementation, the permeable asphalt mixture for paving the lower layer is composed of aggregate 1 with a particle size of [2.36mm~4.75mm), aggregate 2 with a particle size of [4.75mm~9.5mm), aggregate 3 with a particle size of [9.5mm~13.2mm), aggregate 4 with a particle size of [13.2mm~16mm), aggregate 5 with a particle size of [16mm~19mm), aggregate 6 with a particle size of [19mm~26.5mm), and mineral powder in proportions of 5%, 12%, 20%, 20%, 25%, 15%, and 3% by mass.

[0046] In this embodiment, during specific implementation, the colored paint is acrylic or polyurethane-based colored road paint, and more preferably Epikure 3115 polyurethane-based colored road paint.

[0047] In this embodiment, during specific implementation, the curing agent is an acrylic paint curing agent.

[0048] In this embodiment, during specific implementation, the mixing volume ratio of the colored paint and the curing agent is 4:1, and the mixture is fully stirred for 5 minutes and allowed to stand for defoaming for 10 minutes.

[0049] In this embodiment, the airless sprayer uses a nozzle with a diameter of 0.4 to 0.6 mm and a pressure of 20 MPa to 25 MPa. The spray gun is held 30 to 50 cm above the ground and moves at a constant speed (0.5 to 1 m / s) in a Z-shaped cross-spray pattern, with two passes.

[0050] In this embodiment, during specific implementation, the thickness of the colored paint is 3 mm, which does not affect the water permeability coefficient.

[0051] To sum up, the present invention is reasonably designed. By adjusting the bottom permeable water-stabilizing layer and the permeable asphalt grading, the working performance of the water-stabilizing layer and the surface permeable asphalt layer is optimized, thereby ensuring the strength of the permeable asphalt concrete without affecting the permeability coefficient, ensuring that the permeability coefficient and strength of the permeable asphalt concrete are qualified, so as to meet the needs of sponge city construction.

[0052] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any simple modification, change and equivalent structural change made to the above embodiment based on the technical essence of the present invention shall still fall within the scope of protection of the technical solution of the present invention.

Claims

1. A method for on-site forming of colored permeable asphalt concrete in sponge cities, characterized in that: The method comprises the following steps: Step 1: Pave the first bottom permeable water-stabilizing layer: Use a paver to evenly spread the mixed permeable water-stabilizing material on the surface of the gravel layer to form the first bottom permeable water-stabilizing layer; Step 2: Compacting and curing the first bottom permeable water-stabilizing layer: Step 201: Use an 18T vibratory roller to vibrate and compact the first bottom permeable water-stabilizing layer; Step 202: Perform a density test on the compacted first bottom permeable water-stable layer until the density of the compacted first bottom permeable water-stable layer is greater than or equal to a set density value. Step 203: Covering the first bottom permeable water-stabilizing layer after rolling with geotextile and sprinkling water for curing; Step 204: Testing the laying thickness, water permeability, and compressive strength of the first bottom permeable water-stabilizing layer after curing until the laying thickness, water permeability, and compressive strength meet the design values of laying thickness, water permeability, and compressive strength, respectively, to form a first permeable water-stabilizing layer; Step 3: Paving, rolling and curing of the second bottom permeable water-stabilizing layer: According to the method of step 2, the mixed permeable water-stabilizing material is evenly spread on the first permeable water-stabilizing layer, and rolled and cured to form a second permeable water-stabilizing layer; Step 4: Paving and rolling of colored permeable asphalt surface layer: Step 401: Clean the surface of the second permeable water-stabilizing layer and spray emulsified asphalt to form an emulsified asphalt layer; Step 402: Use a paver to evenly spread the lower layer of permeable asphalt mixture on the emulsified asphalt layer to form a lower layer of permeable asphalt layer; Step 403: rolling the lower permeable asphalt layer; Step 404: Using a paver, evenly spread the permeable asphalt mixture on the compacted lower permeable asphalt layer to form an upper permeable asphalt layer. Step 405: rolling the upper permeable asphalt layer according to the method of step 403; Step 406: spray colored paint on the upper permeable asphalt layer after rolling to form colored permeable asphalt concrete.

2. The on-site forming method for colored permeable asphalt concrete in a sponge city according to claim 1, characterized in that: Step 1: The specific process is as follows: Step 101: Clean, level, and compact the soil or gravel foundation to ensure that the flatness and compaction of the foundation meet or exceed the construction design requirements. Step 102: Sprinkle water on the base surface to keep it moisturized; Step 103: Laying graded crushed stones on the foundation surface to form a crushed stone layer; Step 104: Use a paver to evenly spread the mixed permeable water-stabilizing material on the surface of the gravel layer to form a first bottom permeable water-stabilizing layer; wherein the thickness of the first bottom permeable water-stabilizing layer is β times the design value of the laying thickness, β is a correction coefficient, and β is 1.2 to 1.

35.

3. The on-site forming method of colored permeable asphalt concrete for sponge cities according to claim 1 is characterized in that: In step 201, an 18T vibratory roller is used to vibrate and compact the first bottom permeable water-stabilizing layer. The specific process is as follows: Step 2011: Use a single steel wheel roller to statically press the first bottom permeable water-stabilizing layer 1 to 2 times; Step 2012: Use an 18T vibratory roller to vibrate and compact the first bottom permeable water-stabilizing layer 2 to 4 times; Step 2013: Use a rubber-wheel roller to roll the first bottom permeable water-stabilizing layer 1 to 2 times.

4. The on-site forming method for colored permeable asphalt concrete in a sponge city according to claim 1, characterized in that: Step 202, the specific process is as follows: Step 2021: Using a ring knife method, sample the first bottom permeable water-stabilizing layer after rolling to obtain a first core sample, and test the density of the first core sample. If the density of the first core sample is less than the density setting value, execute step 2022; if the density of the first core sample is greater than or equal to the density setting value, execute step 2023; Step 2022: backfill the holes left by the coring with the mixed permeable water-stabilizing material, and repeat step 201 until the density of the first core sample is greater than or equal to the density setting value, and then execute step 2023; Step 2023: backfill the mixed permeable water-stabilizing material into the hole left by the coring, and use a rammer to compact the backfilled permeable water-stabilizing material until the density of the backfilled permeable water-stabilizing material is greater than or equal to the density setting value.

5. The on-site forming method of colored permeable asphalt concrete for sponge cities according to claim 1 is characterized in that: Step 204, the specific process is as follows: Step 2041: Use a core drill to drill a core sample from the first bottom permeable water-stabilizing layer after curing to obtain a second core sample. Obtain the water permeability and compressive strength of the second core sample as the water permeability and compressive strength of the first permeable water-stabilizing layer, respectively. Compare the water permeability and compressive strength of the first permeable water-stabilizing layer with the design water permeability and compressive strength, respectively. If the design water permeability and compressive strength values are met, execute steps 2042 and 2043. If the design water permeability and compressive strength values are not met, crush and remove the first bottom permeable water-stabilizing layer, and repeat step 1. Step 2042: Obtain the height of the second core sample as the thickness L1 of the first permeable water-stabilizing layer. If the thickness L1 of the first permeable water-stabilizing layer satisfies the range of 0.95Ls to 1.05Ls, proceed to step 2044; if the thickness L1 of the first permeable water-stabilizing layer does not meet the range of 0.95Ls to 1.05Ls, proceed to step 2043; wherein Ls represents the design value of the laying thickness. Step 2043: If L1 is less than Ls, according to Lb=Ls-L1, obtain the additional compensation thickness Lb; and obtain the thickness of the second bottom permeable water-stabilizing layer as β(Ls+Lb); If L1 is greater than Ls, according to Lb'=L1-Ls, the reduced compensation thickness Lb' is obtained; and the thickness of the second bottom permeable water-stabilizing layer is obtained as β(Ls-Lb'); Step 2044: Obtain the thickness of the second bottom permeable water-stabilizing layer as βLs.

6. The on-site forming method for colored permeable asphalt concrete in a sponge city according to claim 1, characterized in that: In step 404, the lower permeable asphalt layer is rolled, and the specific process is as follows: Step 4011: When the temperature of the lower permeable asphalt layer drops to 150° C. to 155° C., use a double steel wheel roller to statically press the lower permeable asphalt layer twice; Step 4012: Use an 18T vibratory roller to vibrate and roll the lower permeable asphalt layer 2 to 4 times; Step 4013: When the temperature of the lower permeable asphalt layer drops to 130° C. to 135° C., use a rubber-wheel roller to roll the lower permeable asphalt layer 2 to 4 times; Step 4014: When the temperature of the lower permeable asphalt layer drops to 90°C to 95°C, use a double steel wheel roller to statically press the lower permeable asphalt layer twice to eliminate wheel marks.

7. The on-site forming method for colored permeable asphalt concrete in a sponge city according to claim 1, characterized in that: The permeable water-stabilizing material is prepared from cement, water and residual aggregate, and the aggregate includes a first aggregate with a particle size of [0.075-4.75), a second aggregate with a particle size of [4.75-9.5mm), a third aggregate with a particle size of [9.5-16.0mm) and a fourth aggregate with a particle size of [16.0-31.5mm).

8. The on-site forming method for colored permeable asphalt concrete in a sponge city according to claim 1, characterized in that: The permeable asphalt mixture of the upper layer is 90#A grade asphalt, and the oil-to-stone ratio of the permeable asphalt mixture of the upper layer is 4.4%; The mineral material of the upper layer of permeable asphalt mixture is prepared by mineral powder, fine aggregate with a particle size of [0.075-5mm), a first group of aggregate with a particle size of [5-10mm] and a second group of aggregate with a particle size of [10-15mm]. The permeable asphalt mixture for paving the lower layer is prepared from aggregate 1 with a particle size of [2.36mm~4.75mm), aggregate 2 with a particle size of [4.75mm~9.5mm), aggregate 3 with a particle size of [9.5mm~13.2mm), aggregate 4 with a particle size of [13.2mm~16mm), aggregate 5 with a particle size of [16mm~19mm), aggregate 6 with a particle size of [19mm~26.5mm), and mineral powder.

9. The on-site forming method for colored permeable asphalt concrete in sponge cities according to claim 1, characterized in that: Step 406, the specific process is as follows: Step 4061: Mix the color paint and the curing agent, stir thoroughly until uniform, and let stand to defoam; Step 4062: Use an airless sprayer to spray the mixed colored paint onto the upper permeable asphalt layer to form colored permeable asphalt concrete.

Images