Embedded recycled aggregate concrete pavement with high bearing and high permeable functions and construction method of embedded recycled aggregate concrete pavement

Abstract

The invention discloses an embedded recycled aggregate concrete pavement with high bearing and high permeable functions and a construction method thereof, and belongs to the technical field of road engineering. The pavement comprises a compacted roadbed, a drainage ditch, a cement stabilized macadam base layer, an embedded panel framework layer, a reinforcing mesh and a recycled aggregate concrete surface layer from bottom to top. The construction method sequentially comprises the steps of roadbed treatment, drainage ditch installation, base layer laying, embedded panel splicing, joint elastic sealing, reinforcing mesh laying, recycled aggregate concrete paving and compacting and panel water permeable hole cleaning. Through the three-dimensional composite reinforcement design of the embedded panel framework layer, the reinforcing mesh and the recycled aggregate concrete, a collaborative stress system is constructed, the bending resistance, shearing resistance and fatigue resistance of the pavement are effectively improved, and the pavement is suitable for heavy traffic scenes; meanwhile, through a double-channel water permeable path formed by the water permeable holes of the panel and the concrete pores and key procedures of joint sealing and hole cleaning in construction, it is ensured that the pavement has excellent and lasting water permeable capacity. According to the invention, efficient synergistic utilization of the construction waste recycled aggregate and the recycled plastic panel is also realized, the application bottleneck of insufficient performance of the recycled material is overcome, and the method has remarkable structural, environmental-friendly and economic benefits.

Description

Technical Field

[0001] This invention relates to the field of road engineering technology, specifically to an embedded recycled aggregate concrete pavement with both high load-bearing capacity and high permeability, and its construction method. Background Technology

[0002] In current road engineering, especially in the construction of municipal arterial roads, logistics parks, and sponge city roads, pavement structures face the dual stringent requirements of high load-bearing capacity and high permeability. Traditional technical approaches present a fundamental contradiction: high-load-bearing pavements (such as dense concrete and asphalt pavements) have poor permeability, leading to rainwater runoff and exacerbating urban flooding; while existing permeable pavements (such as porous concrete) have insufficient structural strength and stability due to their high porosity. Under the repeated action of heavy vehicles, they are prone to problems such as aggregate shedding, pore structure collapse, and rapid decline in permeability, resulting in high maintenance costs and difficulty in meeting the requirements for long-term service.

[0003] On the other hand, the resource utilization of construction solid waste is key to the sustainable development of the industry. However, the application of recycled aggregates in high-performance pavements is severely limited due to inherent defects such as large performance variability, low strength, and high water absorption. Existing technologies mostly focus on single material modification or single function realization, failing to achieve deep synergy between the application of recycled materials and the resolution of the core contradiction of "strength-permeability" through systematic structural design.

[0004] Therefore, there is an urgent need for an innovative composite pavement structure and supporting construction methods that can not only overcome the vulnerability of traditional permeable pavements under heavy loads from a mechanistic perspective, but also efficiently utilize recycled materials to achieve the triple goals of load-bearing capacity, permeability, and resource recycling. Summary of the Invention

[0005] This invention aims to provide an embedded recycled aggregate concrete pavement with both high load-bearing capacity and permeability, and its construction method. Its core objectives include: 1. By constructing a three-dimensional composite reinforcement design of embedded panel skeleton, steel mesh and recycled aggregate concrete, a synergistic stress system is built, which fundamentally improves the bending, shear and fatigue resistance of the road surface under heavy traffic.

[0006] 2. Optimize the design of the through-type permeable path to ensure excellent and long-lasting rainwater infiltration capacity even under high-strength structure.

[0007] 3. By using specific structural forms and process details, the shortcomings of recycled aggregates can be overcome, enabling them to be stably applied to high-grade pavements and promoting the high-value utilization of construction solid waste.

[0008] 4. Provide a set of standardized construction methods with rigorous procedures and specific details to ensure that the road performance of the composite structure is realized and that it has good engineering applicability and economy.

[0009] An embedded recycled aggregate concrete pavement with both high load-bearing capacity and high permeability, and its construction method, includes the following steps that must be performed in sequence: Step 1. Subgrade treatment: Clean and compact the subgrade to the designed compaction degree; Step 2. Drainage system installation: Install prefabricated drainage ditches on both sides of the roadbed; Step 3. Laying the load-bearing base: Spread and compact the cement-stabilized crushed stone base to form a flat and solid load-bearing platform; Step 4. Laying the embedded panel skeleton layer: Lay the prefabricated embedded panels with water-permeable holes on the base layer according to the positioning lines, and splice them with the interlocking slots and raised structures on the edge of the panels to form a continuous and integral planar skeleton. Step 5. Joint sealing and functional inspection: After cleaning the panel joints, insert elastic sealing strips, with the insertion depth controlled at 2 / 3 to 3 / 4 of the joint depth, to achieve a balance between sealing and preventing grout leakage and adapting to deformation; at the same time, check and ensure that all panel drainage holes are unobstructed. Step 6. Reinforcing mesh laying: A reinforcing mesh is laid on the panel skeleton layer, with the reinforcing bars passing through or adjacent to the panel's permeable holes to form a three-dimensional spatial constraint for subsequent concrete pouring; Step 7. Construction of recycled aggregate concrete surface layer: On the panel skeleton layer and base layer, spread recycled aggregate concrete and fully vibrate and compact it so that the concrete slurry partially penetrates into the panel holes and gaps, forming a mechanical bond with the panel and reinforcing steel. Step 8. Cleaning of key holes: After the initial setting of the concrete and before the final setting, carry out special cleaning of the reserved permeable holes of the embedded panel to remove residual slurry and debris in the holes and ensure that the permeable path is unobstructed.

[0010] Preferably, the embedded panel is a prefabricated component made of recycled polypropylene, which is lightweight, highly tough, and corrosion-resistant. It serves not only as a water-permeable channel but also as a load-bearing framework and deformation-coordinating layer for the entire surface layer.

[0011] Preferably, in step 7, the recycled aggregate concrete uses recycled aggregate from construction waste with optimized gradation design, and the replacement rate is 30%-50%.

[0012] Preferably, in step 5, the elastic sealing strip is made of neoprene rubber and has a circular cross-section.

[0013] An embedded recycled aggregate concrete pavement constructed by the above method is characterized in that, from bottom to top, it comprises: 1. Strengthen the roadbed; 2. Precast drainage ditches located on both sides of the roadbed; 3. Cement-stabilized crushed stone base course; 4. Embedded panel skeleton layer: It is composed of multiple recycled polypropylene panels spliced ​​together by an interlocking structure. Elastic sealing strips are set between the panels, and the panel body has regularly arranged water-permeable holes. 5. Reinforcing mesh laid on the panel frame layer; 6. Recycled aggregate concrete surface layer; The recycled aggregate concrete surface layer, the embedded panel skeleton layer, and the steel mesh are bonded together through interlocking holes and wrapping to form a three-dimensional composite load-bearing body. The panel skeleton layer effectively disperses the upper load and temperature stress, avoiding local stress concentration cracking of the recycled aggregate concrete layer.

[0014] Explanation of beneficial effects: Compared with the prior art, the present invention has the following significant, though not obvious, effects: 1. Breakthrough improvement in structural performance: By introducing an "embedded panel skeleton layer," the traditional two-dimensional layered pavement structure is upgraded to a three-dimensional spatial composite structure. The synergistic effect of the mechanical interlocking between the panel and the concrete, and the reinforcement effect of the steel mesh, makes the load distribution more uniform when the pavement is under heavy load, and its bending tensile and fatigue resistance is significantly better than that of ordinary permeable concrete pavement without this skeleton layer (comparative test data can be provided to prove this).

[0015] 2. Achieving long-term high permeability: The unique dual-channel permeability design of "vertical holes in the panel + internal pores in the concrete," along with the crucial process of cleaning the panel holes at the end of construction, jointly ensures the initial and long-term effectiveness of the permeability path. Elastic joint sealing prevents the base slurry from clogging the channels, allowing the pavement permeability coefficient to remain stable at a high level (e.g., ≥1.5mm / s) for a long period.

[0016] 3. High-efficiency and high-value utilization of recycled materials: This invention does not simply replace materials, but rather leverages the strengths and mitigates the weaknesses of recycled materials through structural innovation. Lightweight and high-toughness recycled plastic panels serve as an intermediate buffer layer, improving the stress state of the brittle recycled aggregate concrete. This allows for the formulation of concrete that meets heavy-load requirements without overly relying on the strength of the aggregate itself, thus successfully applying low-quality recycled aggregates to high-grade pavements and overcoming key technical obstacles in their application.

[0017] 4. Specialization and Reliability of Construction Methods: The prescribed construction sequence (panel first, then reinforcement, then concrete) and process details (sealing to specific depths, cleaning of holes) are key to ensuring the formation of the aforementioned three-dimensional composite structure and double permeable channels. This construction method is highly specialized and indivisible, ensuring the reliability and consistency of project quality. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the embedded panel's single-unit structure; Figure 2 This is a schematic diagram of the steel mesh laid on the panel frame layer; Figure 3 This is a schematic diagram of the overall cross-sectional structure of an embedded recycled aggregate concrete pavement. Detailed Implementation

[0019] The present invention will be further described in detail below with reference to specific embodiments, comparative examples, and verification experiments. The described embodiments are only preferred embodiments of the present invention, and not all possible embodiments. Other embodiments obtained by those skilled in the art without creative effort under the core concept of the present invention are all within the protection scope of the present invention.

[0020] Basic parameters of raw materials: Recycled aggregate: Waste concrete from building demolition projects is crushed, screened, washed and strengthened to obtain continuously graded coarse aggregate with a particle size range of 5-25mm, crushing value ≤18%, needle-like and flaky particle content ≤10%, and water absorption ≤6.5%; fine aggregate is natural river sand with a fineness modulus of 2.6 and mud content ≤1.0%.

[0021] Cementitious materials: P.O42.5 grade ordinary Portland cement is used, with a 3-day compressive strength ≥25MPa and a 28-day compressive strength ≥42.5MPa; Grade II fly ash is added, with a loss on ignition ≤8% and a water requirement ratio ≤105%.

[0022] Embedded panel: Made of recycled polypropylene (PP-R) injection molding. The raw material of recycled polypropylene comes from waste household appliance shells and plastic pipes. Melt index is 1.8-2.5g / 10min, tensile strength is ≥25MPa, elongation at break is ≥200%, and simply supported beam impact strength is ≥8kJ / m².

[0023] Supporting materials: The steel mesh uses HRB400 grade hot-rolled ribbed steel bars; the elastic sealing strip uses circular cross-section neoprene rubber strips with a Shore hardness of 60±5 Shore A, tensile strength ≥15MPa, and elongation at break ≥400%; the recycled aggregate concrete is mixed with polycarboxylate-based high-efficiency water-reducing agent, with a water reduction rate ≥25% and a solid content ≥20%.

[0024] Example 1

[0025] This embodiment is a test section of a heavy-load road. The pavement has a design service life of 15 years and a design axle load of BZZ-100. The test section is 50m long and 8m wide. The specific implementation technology, construction steps and parameters are as follows: Please see Figure 3The diagram shows the overall cross-sectional structure of the embedded recycled aggregate concrete pavement. Specifically, the pavement structure consists of, from bottom to top, a compacted subgrade, precast drainage ditches on both sides of the subgrade, a cement-stabilized crushed stone base course, an embedded panel skeleton layer, a steel mesh, and a recycled aggregate concrete surface layer. Each structural layer is tightly integrated and forms a three-dimensional composite stress system through physical interlocking and bonding.

[0026] The specific parameters for each structural layer are as follows: (1) Compacting the subgrade: The subgrade is compacted in layers with each layer having a loose thickness of 300mm, a compaction degree of ≥96%, and a roadbed resilient modulus of ≥30MPa; (2) Precast drainage ditch: C30 precast concrete drainage ditch is set on both sides of the roadbed. The cross-sectional dimensions are 400mm wide and 500mm deep. The ditch body is reserved with water-permeable holes to connect with the base layer, so as to realize the orderly collection and discharge of rainwater infiltrated by the road surface. (3) Cement stabilized crushed stone base course: 200mm thick, 5% cement content, continuous gradation of crushed stone, compaction degree ≥98%, 7-day unconfined compressive strength ≥4.0MPa, forming a flat and solid load-bearing platform; (4) Embedded panel skeleton layer: A continuous integral skeleton is formed by splicing together multiple prefabricated embedded panels with water-permeable holes. Figure 1 As shown, this is an embedded panel unit structure, specifically a 500mm×500mm×80mm prefabricated component injection molded from recycled polypropylene. The panel body has 10mm diameter water permeable holes arranged in a 100mm×100mm spacing array. The sides of the panel are equipped with dovetail-shaped interlocking grooves and protrusions. The grooves are 20mm deep, and the protrusions and grooves are interference-fitted with a tolerance of 0.5mm, enabling rapid splicing and overall locking of multiple panels. The width of the splicing seam between adjacent panels is controlled at 3-5mm. (5) Elastic sealing strip: Φ12mm round neoprene rubber strip is used, embedded in the joint to a depth of 20mm, which is 2 / 3 of the total depth of the joint, taking into account both joint sealing and leakage prevention and temperature deformation adaptability. (6) Steel mesh: Figure 2 The diagram shows a steel mesh laid on the panel skeleton layer. Specifically, it is a mesh formed by welding HRB400 grade hot-rolled ribbed steel bars with Φ8@150mm. The overlap length of the mesh is ≥200mm. When laying, the steel bars are close to the edge of the permeable holes in the panel. The protective layer thickness is ≥20mm, which forms a three-dimensional spatial constraint for subsequent concrete pouring and forms a reinforcement system that works synergistically with the panel skeleton layer. (7) Recycled aggregate concrete surface layer: 120mm thick, designed strength grade C40, mix proportion: cement 320kg / m³, fly ash 80kg / m³, recycled coarse aggregate 980kg / m³ (aggregate replacement rate 50%), natural coarse aggregate 980kg / m³, river sand 180kg / m³, water 130kg / m³, water reducing agent 4.8kg / m³; designed porosity 18%.

[0027] The specific steps are as follows: Step 1: Subgrade treatment. Clean up surface debris and humus within the test section of the subgrade. Use a heavy roller to compact the subgrade in layers, with each layer having a loose thickness of 300mm. Compact until the compaction degree is ≥96%. After testing the subgrade resilient modulus to ≥30MPa, the subgrade construction is completed. Step 2: Drainage system installation. Lay out the positioning lines on both sides of the roadbed, install the precast C30 concrete drainage ditches, level and fix them, and seal the joints of the drainage ditches to ensure that the ditches are straight and the drainage is unobstructed. The ditches are equipped with permeable holes that connect to the base layer. Step 3: Load-bearing base course construction. A cement-stabilized crushed stone mixture with a cement content of 5% is spread on the roadbed using a paver at a uniform speed to a thickness of 220mm. After compaction with a heavy roller, the thickness is reduced to 200mm. After compaction, the mixture is kept moist for 7 days. The compaction degree is tested to be ≥98%, and the 7-day unconfined compressive strength is ≥4.0MPa. This completes the base course construction. Step 4: Laying the embedded panel skeleton layer. Mark the panel positioning lines on the cured base layer, and lay the prefabricated embedded panels one by one according to the positioning lines. Use the dovetail grooves on the side of the panel to splice with the raised structure to ensure tight splicing and flat panel surface, forming a continuous and integral planar skeleton. Check the panel permeable holes for blockage throughout the process. Step 5: Joint sealing and functional inspection. Clean debris and dust from the panel joints, press a Φ12mm circular neoprene rubber strip into the joint, controlling the embedding depth to 20mm (2 / 3 of the total joint depth), and complete the elastic seal of the joint; check each of the panel's water permeable holes again to ensure that all holes are unobstructed throughout; Step 6: Laying the reinforcing mesh. Lay HRB400 grade Φ8@150mm reinforcing mesh on the panel skeleton layer. The overlap length between mesh sheets is ≥200mm. Use binding wire to fix the overlap. Adjust the position of the reinforcing bars to be close to the edge of the permeable holes in the panel. Control the thickness of the protective layer to ≥20mm to avoid the reinforcing bars covering and blocking the permeable holes. Step 7: Construction of recycled aggregate concrete surface layer. Use a forced mixer to mix the recycled aggregate concrete according to the design mix proportion, with a mixing time ≥90s to ensure uniformity of the mixture. Spread the mixture evenly on the panel skeleton layer and base layer, with a spreading thickness of 140mm. Use a plate vibrator in conjunction with a small immersion vibrator to fully vibrate and compact the mixture. After shaping, the surface layer thickness should be 120mm. During vibration, avoid touching or displacing the reinforcing mesh and panel, allowing some of the concrete slurry to seep into the panel's pores and gaps, forming a stable mechanical bond with the panel and reinforcing bars. Step 8: Cleaning of key holes. After the initial setting and before the final setting of the concrete (4 hours after pouring in this example), use a special hole cleaning tool to clean each of the reserved permeable holes in the embedded panel, thoroughly removing any residual slurry and debris from the holes to ensure that the permeable holes in the panel are completely unobstructed, thus completing the main road construction. Step 9: Maintenance. After the road surface construction is completed, geotextile fabric will be used for covering and moisture retention maintenance. The maintenance period is ≥14 days, and vehicles are prohibited from passing through during the maintenance period.

[0028] Furthermore, 28 days after the road surface is completed and cured, a comprehensive road performance test is conducted in accordance with current national and industry standards. Simultaneously, an indoor accelerated fatigue test is carried out. The specific test methods and data are as follows: (1) Mechanical performance test: According to GB / T50081-2019 "Standard for Test Methods of Physical and Mechanical Properties of Concrete", the compressive strength and flexural strength of the pavement were tested by core drilling. The measured average compressive strength reached 42.8MPa and the average flexural strength reached 4.7MPa, which met the design requirements of heavy traffic pavement. (2) Permeability test: According to CJJ / T135-2009 "Technical Specification for Permeable Cement Concrete Pavement", the permeability coefficient of the pavement was tested using a constant head permeability meter. The measured average permeability coefficient was 1.72 mm / s, which meets the permeability performance requirements of sponge city roads. (3) Fatigue resistance test: The MTS electro-hydraulic servo fatigue testing machine was used to conduct a four-point bending fatigue loading test on the road core specimen. The loading stress ratio was 0.7 and the loading frequency was 10Hz. The repeated action of the standard axle load BZZ-100 was simulated. After fatigue cycles equivalent to 1 million standard axle loads, no structural cracks appeared in the specimen and no aggregate loss occurred. The permeability coefficient was retested to be 1.56mm / s, and the permeability coefficient retention rate reached 90.7%, which shows excellent long-term service performance.

[0029] Example 2

[0030] This embodiment is a test section of a secondary arterial road in a certain city. The pavement has a design service life of 10 years and a design axle load of BZZ-100. The test section is 80m long and 12m wide. The specific implementation technology and core parameters are as follows: Road surface structure layer parameters: (1) Compacting the roadbed: compaction degree ≥95%, roadbed resilient modulus ≥25MPa; (2) Precast drainage ditch: C30 precast concrete drainage ditch is set on both sides of the roadbed, with a cross-sectional dimension of 300mm wide × 400mm deep; (3) Cement-stabilized crushed stone base course: 180mm thick, 4.5% cement content, compaction degree ≥97%, 7-day unconfined compressive strength ≥3.5MPa; (4) Embedded panel skeleton layer: The size of a single panel is 600mm×600mm×60mm, the diameter of the water permeable hole is 8mm, and the holes are distributed in an array with a spacing of 80mm×80mm. The depth of the interlocking groove on the side of the panel is 15mm, and the width of the splicing seam is 3-4mm. (5) Elastic sealing strip: Φ10mm round neoprene rubber strip is used, embedded in the joint to a depth of 15mm, which is 3 / 4 of the total joint depth; (6) Reinforcing mesh: Φ6@200mm HRB400 reinforcing mesh is used, with an overlap length ≥150mm; (7) Recycled aggregate concrete surface layer: 100mm thick, design strength grade C30, recycled coarse aggregate replacement rate 30%, mix proportion: cement 300kg / m³, fly ash 60kg / m³, recycled coarse aggregate 570kg / m³, natural coarse aggregate 1330kg / m³, river sand 220kg / m³, water 125kg / m³, water reducing agent 4.2kg / m³, design porosity 20%.

[0031] Furthermore, the construction process: strictly follow the 8-step sequence specified in this invention, clean the permeable holes in the panel after the initial setting of the concrete and before the final setting, and cure for 14 days.

[0032] Further performance test data: After 28 days of maintenance, the average compressive strength of the pavement was 35.6 MPa, the flexural strength was 3.8 MPa, and the permeability coefficient was 1.95 mm / s. After 800,000 cycles of standard axle load equivalent fatigue test, there was no structural damage, and the permeability coefficient retention rate was 88.2%, meeting the dual requirements of load-bearing capacity and permeability of municipal roads.

[0033] Furthermore, two comparative examples were set up and parallel experiments were conducted with Example 1 under the same raw materials, the same test environment, and the same testing standards, as detailed below: Comparative Example 1: Traditional porous recycled aggregate concrete pavement (without embedded panel skeleton layer and without steel mesh).

[0034] Road structure: From bottom to top, it consists of compacted subgrade, precast drainage ditch, cement-stabilized crushed stone base course, and recycled aggregate concrete surface course; the parameters of the subgrade, base course, and drainage ditch are completely consistent with those of Example 1, and the thickness of the recycled aggregate concrete surface course is 120mm, and the mix proportion, design strength, and design porosity are completely consistent with those of Example 1. Construction process: The construction follows the standard process of traditional permeable concrete pavement, including subgrade → base course → drainage ditch → concrete paving and compaction → curing, without panel splicing, joint sealing, steel mesh laying, or special cleaning of permeable holes. Performance test data: After 28 days of maintenance, the average compressive strength of the pavement was 22.1 MPa, the flexural strength was 2.8 MPa, and the initial permeability coefficient was 2.0 mm / s. After 500,000 cycles of standard axle load equivalent fatigue test, the pavement surface showed severe aggregate loss, local pore collapse, and fine structural cracks. The permeability coefficient was retested and dropped to 0.42 mm / s. The permeability function was basically lost, and it could not meet the long-term service requirements of heavy traffic.

[0035] Preferred example 2 is a reinforced porous recycled aggregate concrete pavement (without an embedded panel skeleton layer).

[0036] Road surface structure: From bottom to top, it consists of compacted roadbed, precast drainage ditch, cement-stabilized crushed stone base course, steel mesh, and recycled aggregate concrete surface course; the parameters of the roadbed, base course, drainage ditch, steel mesh, and surface course are completely consistent with those of Example 1, except that the embedded panel skeleton layer and the corresponding joint sealing and permeable hole cleaning processes are not included. Construction process: Constructed according to traditional reinforced permeable concrete technology, roadbed → base course → drainage ditch → steel mesh laying → concrete spreading and compaction → curing; Performance test data: After 28 days of maintenance, the average compressive strength of the pavement was 30.5 MPa, the flexural strength was 3.3 MPa, and the initial permeability coefficient was 1.9 mm / s. After 500,000 cycles of standard axle load equivalent fatigue test, the pavement showed local cracking and aggregate loss. The permeability coefficient was retested and dropped to 0.85 mm / s, indicating significant performance degradation. It still cannot meet the requirements for long-term service under heavy traffic.

[0037] Furthermore, by comparing the parallel experimental data of the examples and comparative examples, the following conclusions can be clearly drawn: This invention constructs a collaborative stress-bearing system through a three-dimensional composite reinforcement design of an embedded panel skeleton layer, steel mesh, and recycled aggregate concrete. Compared with traditional permeable pavement, the 28-day compressive strength is increased by 93.7%~121.7%, and the flexural strength is increased by 42.4%~67.9%, which greatly improves the load-bearing capacity and deformation resistance of the pavement and can meet the requirements of heavy traffic scenarios. This invention features a unique dual-channel permeable design combining vertical permeable holes in the pavement panel and internal pores within the concrete. Combined with a specialized cleaning process for the permeable holes after initial setting and before final setting at the end of construction, and an elastic seal at the joints to prevent leakage, this effectively ensures the long-term unobstructed flow of the permeable path. After 1 million standard axle load fatigue cycles, the permeability coefficient retention rate remains above 90%. Compared to the comparative example, the long-term permeability performance is significantly improved, addressing the industry pain point of rapid degradation of the permeability function in traditional permeable pavements. This invention effectively overcomes the application bottleneck of insufficient performance of recycled aggregates through structural innovation, enabling the application of 30%-50% recycled aggregates from construction solid waste. At the same time, it uses recycled polypropylene to prepare embedded panels, realizing the synergistic resource utilization of construction solid waste and waste plastics, and has significant environmental and economic benefits.

[0038] The experimental results are shown in the table below: Performance testing items Testing standards Example 1 (Road in a Heavy-Duty Logistics Park) Example 2 (Secondary Municipal Road) Comparative Example 1 (Traditional unreinforced permeable pavement without panels) Comparative Example 2 (Reinforced permeable pavement without pavement panels) 28-day compressive strength (MPa) GB / T50081-2019 42.8 35.6 22.1 30.5 28-day flexural strength (MPa) GB / T50081-2019 4.7 3.8 2.8 3.3 Initial permeability coefficient (mm / s) CJJ / T135-2009 1.72 1.95 2.0 1.9 Fatigue test loading conditions Four-point bending fatigue loading, stress ratio 0.7, frequency 10Hz, standard axle load BZZ-100 equivalent cycle. 1 million times 800,000 times 500,000 times 500,000 times Permeability coefficient (mm / s) after fatigue test CJJ / T135-2009 1.56 1.72 0.42 0.85 Permeability coefficient retention rate Fatigue value / Initial value × 100% 90.7% 88.2% 21.0% 44.7% Structural damage after fatigue Appearance observation + non-destructive testing No structural cracks, no aggregate loss No structural damage, no obvious aggregate loss Severe aggregate loss, pore collapse, and the appearance of fine structural cracks. Localized cracking and aggregate detachment, without continuous cracks. Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An embedded recycled aggregate concrete pavement with both high load-bearing capacity and high permeability, and its construction method, characterized in that, The following steps must be included in sequence: roadbed treatment; drainage ditch installation; cement-stabilized crushed stone base layer laying; splicing and laying embedded panels with permeable holes on the base layer to form a continuous skeleton layer; elastic sealing of panel joints; laying steel mesh on panel skeleton; spreading and compacting recycled aggregate concrete to form surface layer; and post-cleaning of permeable holes in the panels.

2. The embedded recycled aggregate concrete pavement with both high load-bearing capacity and high permeability, and its construction method, as described in claim 1, is characterized in that... The embedded panel is made of recycled plastic and has slots and raised structures on its edges for splicing together.

3. The embedded recycled aggregate concrete pavement with both high load-bearing capacity and high permeability, and its construction method, as described in claim 2, is characterized in that... The recycled plastic is recycled polypropylene.

4. The embedded recycled aggregate concrete pavement with both high load-bearing capacity and high permeability, and its construction method, as described in claim 1, is characterized in that... The elastic sealing of the joint refers to embedding a circular cross-section elastic rubber strip into the joint to a depth of 2 / 3 to 3 / 4 of the joint depth.

5. The embedded recycled aggregate concrete pavement with both high load-bearing capacity and high permeability, and its construction method, as described in claim 1, is characterized in that... The aggregate in the recycled aggregate concrete contains 30%-50% recycled aggregate from construction waste.

6. The embedded recycled aggregate concrete pavement with both high load-bearing capacity and high permeability, and its construction method, as described in claim 1, is characterized in that... The subsequent cleaning of the permeable holes in the panel is carried out after the initial setting and before the final setting of the recycled aggregate concrete.

7. An embedded recycled aggregate concrete pavement with both high load-bearing capacity and high permeability, characterized in that, From bottom to top, it includes: roadbed, drainage ditch, cement-stabilized crushed stone base course, panel skeleton layer consisting of multiple permeable embedded panels spliced ​​together, steel mesh laid on the panel skeleton layer, and recycled aggregate concrete surface layer.

8. The embedded recycled aggregate concrete pavement according to claim 7, characterized in that, The embedded panel is a precast recycled polypropylene component, whose permeable holes remain unobstructed after the concrete is poured, and together with the internal pores of the concrete, they form a permeable path.

9. The embedded recycled aggregate concrete pavement according to claim 7, characterized in that, The recycled aggregate concrete surface layer, the panel skeleton layer, and the steel mesh together form a three-dimensional composite load-bearing structure through physical interlocking and bonding.

10. The embedded recycled aggregate concrete pavement according to claim 7, characterized in that, The pavement has a 28-day compressive strength of not less than 40 MPa and a permeability coefficient of not less than 1.5 mm / s.

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