Cement concrete pavement widening reconstruction composite pavement structure

Abstract

The utility model relates to civil engineering road and bridge technical field, and concretely is a cement concrete pavement widening reconstruction composite pavement structure, including present situation cement concrete road, widening concrete road, power transmission reinforcement, asphalt concrete upper cover, the present situation cement concrete road upper end surface with the widening concrete road upper end surface flush, power transmission reinforcement one end is connected the present situation cement concrete road, and the other end is connected the widening concrete road, the asphalt concrete upper cover is laid in the present situation cement concrete road and widening concrete road top, including from bottom to top laid asphalt concrete isolation layer, continuous reinforced concrete slab, asphalt concrete surface layer, be equipped with reinforcement in the continuous reinforced concrete slab, the utility model has the advantages of reconstruction pavement structure integrity is good, can adapt to heavy traffic traffic demand, can make full use of old cement concrete pavement residual strength, effectively reduce the generation of new and old pavement junction cracking and reflection crack.

Description

Technical Field

[0001] This utility model relates to the field of civil engineering road and bridge technology, specifically to a composite pavement structure for widening and remodeling cement concrete pavement. Background Technology

[0002] With the rapid development of my country's economy and the significant increase in car ownership, road traffic volume and vehicle load have increased year by year, leading to a demand for road widening, reconstruction, and structural reinforcement. Cement concrete pavement was one of the main pavement types in my country in its early days, with advantages such as high strength, high rigidity, and high load-bearing capacity; however, it also suffers from high driving noise and poor comfort. Currently, the reconstruction method for cement concrete pavement often involves adding an asphalt surface layer on top of the old cement concrete pavement, a process known as "white-to-black conversion."

[0003] When widening and renovating cement concrete pavements, due to the difference in stiffness between the existing road and the widened part of the roadbed, the conventional "white-to-black" pavement structure is prone to uneven settlement at the junction of the old and new pavements when subjected to heavy traffic loads, which can lead to pavement cracking. At the same time, structural defects in the existing cement concrete pavement can also be reflected to the asphalt concrete surface layer, forming reflective cracks.

[0004] In existing technologies, such as patent CN222024814U, a widening structure for the edge of an old road surface is proposed. This patent directly lays a rubber asphalt stress-absorbing layer and an asphalt concrete layer on the existing cement concrete road. The rubber asphalt stress-absorbing layer lacks reinforcement. When the road surface bears heavy traffic loads, the rubber asphalt stress-absorbing layer alone cannot absorb all the load, potentially leading to structural defects in the existing cement concrete pavement reflecting onto the asphalt concrete surface layer. Therefore, it is necessary to propose a composite road structure that can fully utilize the residual strength of the old cement concrete pavement, maintain good integrity, adapt to heavy traffic loads, and reduce cracking and reflective cracking at the junction of the old and new pavements. Utility Model Content

[0005] The purpose of this utility model is to provide a composite pavement structure for widening and remodeling cement concrete pavement. Compared with the prior art, the pavement structure of this utility model has good overall integrity, can adapt to the needs of heavy traffic, can make full use of the residual strength of the old cement concrete pavement, and effectively reduce the cracking and reflective cracking at the junction of the old and new pavements.

[0006] The technical solution of this utility model is: a composite pavement structure for widening and renovating cement concrete pavement, comprising: The existing cement concrete road includes an existing concrete subbase, an existing concrete base course, and an existing concrete surface course, which are laid from bottom to top. The widening of the concrete road includes a compacted roadbed, a graded crushed stone cushion layer, and a widened concrete base layer. The compacted roadbed, the graded crushed stone cushion layer, and the widened concrete base layer are laid from bottom to top, and the upper surface of the widened concrete base layer is flush with the upper surface of the existing concrete surface layer. Multiple force-transfer ribs, one end of which is connected to the existing concrete surface layer and the other end of which is connected to the widened concrete base layer; An asphalt concrete cover is laid above the existing cement concrete road and the widened concrete road. It includes an asphalt concrete isolation layer, a continuously reinforced concrete slab, and an asphalt concrete surface layer. The asphalt concrete isolation layer, the continuously reinforced concrete slab, and the asphalt concrete surface layer are laid from bottom to top. The continuously reinforced concrete slab is reinforced.

[0007] According to the present invention, a composite pavement structure for widening and renovating cement concrete pavement is provided, wherein the end connecting the existing cement concrete road and the widened concrete road is stepped, and the width of the step is 20-25cm.

[0008] According to the present invention, a composite pavement structure for widening and remodeling cement concrete pavement is provided, wherein the top surface resilient modulus of the compacted subgrade of the widened concrete road is ≥40MPa.

[0009] According to the present invention, a composite pavement structure for widening and renovating cement concrete pavement is provided, wherein the thickness of the graded crushed stone subbase of the widened concrete road is 20cm.

[0010] According to the present invention, a composite pavement structure for widening and renovating cement concrete pavement is provided, wherein the flexural tensile strength of the widened concrete base course of the widened concrete road at 28 days is ≥4.5MPa.

[0011] According to the present invention, a composite pavement structure for widening and renovating cement concrete pavement is provided, wherein the force transmission reinforcement is made of φ25 plain round steel bar with a length of 45cm, half of which is embedded in the existing concrete surface layer and half of which is embedded in the widened concrete base layer; the spacing of the force transmission reinforcement is 40cm.

[0012] According to the present invention, a composite pavement structure for widening and renovating cement concrete pavement is provided, wherein the thickness of the asphalt concrete isolation layer is 4.0 cm.

[0013] According to the present invention, a composite pavement structure for widening and renovating cement concrete pavement is provided, wherein the thickness of the continuously reinforced concrete slab is 20-24cm and the flexural tensile strength at 28 days is ≥5.0MPa.

[0014] According to the present invention, a composite pavement structure for widening and renovating cement concrete pavement is provided. The reinforcement in the continuously reinforced concrete slab includes multiple longitudinal and transverse reinforcing bars. The longitudinal and transverse reinforcing bars are threaded steel bars, arranged in a single layer in a cross pattern. The longitudinal reinforcing bars are perpendicular to the road cross section, have a diameter of 12-20 mm, and have a reinforcement ratio of 0.6%-1.0% based on the continuously reinforced concrete slab. They are located 9-10 cm away from the top surface of the continuously reinforced concrete slab. The transverse reinforcing bars are parallel to the road cross section, connected below the longitudinal reinforcing bars, and have the same type as the longitudinal reinforcing bars. The spacing of the transverse reinforcing bars is 30-60 cm.

[0015] According to this utility model, a composite pavement structure for widening and renovating cement concrete pavement is provided. The asphalt concrete surface layer includes a lower layer and an upper layer. The thickness of the lower layer is 6 cm, and the thickness of the upper layer is 4 cm. A bonding layer is provided between the lower layer and the upper layer, and a bonding layer is provided between the asphalt concrete surface layer and the continuously reinforced concrete slab. The bonding oil used in the bonding layer is emulsified asphalt PC-3 type, with a dosage of 0.5 L / m. 2 .

[0016] The advantages of this utility model are: 1. The widening and reconstruction composite pavement structure proposed in this utility model adopts a structural form of continuous reinforced concrete slab + asphalt concrete surface layer with good integrity and can adapt to the needs of heavy traffic loads. It can overcome the uneven settlement at the junction of new and old pavement and reduce the risk of pavement cracking and reflective cracking at the junction. 2. Compared with the existing road structure excavation and reconstruction, the proposed widening and reconstruction composite road structure makes full use of existing road materials and the residual strength of old cement concrete pavement, avoiding material waste and environmental problems caused by the disposal of construction waste caused by the demolition of existing pavement, and fully considering both economic and environmental benefits. 3. The existing cement concrete road and the widened concrete road are connected by a stepped treatment at one end, which ensures the strength of the lateral overlap between the existing cement concrete road and the widened concrete road and helps to reduce differential settlement. 4. The compacted roadbed of the widened concrete road of this utility model is leveled and compacted, which ensures the foundation strength of the widened concrete road. 5. The graded crushed stone cushion layer of this utility model for widening concrete roads has a thickness of 20cm, which provides sufficient pressure relief and buffering capacity for widening concrete roads. 6. The flexural tensile strength of the widened concrete base layer of the widened concrete road of this utility model is ≥4.5MPa at 28 days, which ensures the resistance to heavy pressure of the widened concrete road. 7. The force transfer bar of this utility model is inserted half into the existing concrete surface layer and half into the widened concrete base layer, which can strengthen the connection strength between the existing cement concrete road and the widened concrete road and avoid uneven settlement at the junction of the old and new road surfaces. 8. This utility model sets up an asphalt concrete isolation layer between the existing road and the asphalt concrete surface layer, which can reduce the risk of reflective cracking of the asphalt concrete surface layer by the existing road. 9. This utility model lays multiple longitudinal and transverse steel bars in a continuously reinforced concrete slab, which can significantly enhance the compressive and shear strength of the continuously reinforced concrete slab and improve the service life of the widened and reconstructed composite pavement structure. 10. The asphalt concrete surface layer of this utility model has an adhesive layer between the upper and lower layers, and between the asphalt concrete surface layer and the continuously reinforced concrete slab, which improves the integrity of the widened and reconstructed composite pavement structure and the connection strength between the old and new pavements. Attached Figure Description

[0017] To more clearly illustrate the technical solution of this utility model, the accompanying drawings used in the description of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a cross-sectional schematic diagram of the composite pavement structure for widening and remodeling cement concrete pavement according to this utility model. Figure 2 This is a schematic diagram of the cross-section of a conventional cement concrete road after the step treatment. Figure 3 This is a schematic diagram of the reinforcement of the continuously reinforced concrete slab of this utility model; Wherein: 1-Existing cement concrete road; 11-Existing concrete subbase; 12-Existing concrete base course; 13-Existing concrete surface course; 2-Wideened concrete road; 21-Compacted subgrade; 22-Graded crushed stone subbase; 23-Wideened concrete base course; 3-Strength transfer reinforcement; 4-Asphalt concrete top cover; 41-Asphalt concrete isolation layer; 42-Continuously reinforced concrete slab; 43-Asphalt concrete surface course; 431-Lower layer; 432-Upper layer; 5-Longitudinal reinforcement; 6-Transverse reinforcement. Detailed Implementation

[0019] The embodiments of this utility model are described in detail below, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0020] In the description of this utility model, it should be understood that the terms "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0021] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0022] This utility model provides a composite pavement structure for widening and reconstructing cement concrete pavement. Compared with the prior art, the pavement structure of this utility model has good overall integrity, can adapt to the needs of heavy traffic, can make full use of the residual strength of the old cement concrete pavement, and effectively reduce the occurrence of cracks and reflective cracks at the junction of the old and new pavements.

[0023] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0024] A composite pavement structure for widening and renovating cement concrete pavements, specifically, such as... Figure 1 , 2 As shown, it includes: The existing cement concrete road 1 includes an existing concrete subbase 11, an existing concrete base course 12, and an existing concrete surface course 13, which are laid from bottom to top. The widened concrete road 2 includes a compacted roadbed 21, a graded crushed stone cushion layer 22, and a widened concrete base layer 23. The compacted roadbed 21, the graded crushed stone cushion layer 22, and the widened concrete base layer 23 are laid from bottom to top, and the upper surface of the widened concrete base layer 23 is flush with the upper surface of the existing concrete surface layer 13. Multiple force transmission bars 3, one end of the force transmission bar 3 is connected to the existing concrete surface layer 13, and the other end is connected to the widened concrete base layer 23; The asphalt concrete cover 4 is laid on top of the existing cement concrete road 1 and the widened concrete road 2. It includes an asphalt concrete isolation layer 41, a continuously reinforced concrete slab 42, and an asphalt concrete surface layer 43. The asphalt concrete isolation layer 41, the continuously reinforced concrete slab 42, and the asphalt concrete surface layer 43 are laid from bottom to top.

[0025] Preferably, the existing cement concrete road 1 needs to undergo engineering pretreatment according to the "Technical Specification for Maintenance of Cement Concrete Pavement of Highway" (JTJ073.1-2001), and steps need to be excavated at the end of the existing cement concrete road 1 that needs to be widened. Specifically, for example... Figure 2 As shown, the existing concrete subbase 11, existing concrete base course 12, and existing concrete surface course 13 are excavated sequentially to form steps. The existing concrete base course 12 is wider than the existing concrete subbase 11, and the existing concrete surface course 13 is wider than the existing concrete base course 12. The width of each step is controlled between 20 and 25 cm. Excavating the existing cement concrete road 1 to form a stepped shape can enhance the lateral overlap strength between the existing cement concrete road 1 and the widened concrete road 2, and reduce differential settlement.

[0026] Preferably, such as Figure 1 As shown, in order to enhance the strength of the roadbed of the widened concrete road 2, the compacted roadbed 21 in this embodiment was leveled and compacted. The top surface resilient modulus of the compacted roadbed 21 after compaction is ≥40MPa.

[0027] Preferably, such as Figure 1 As shown, in this embodiment, the compaction degree and filler of the graded crushed stone cushion layer 22 meet the requirements of the "Technical Specifications for Construction of Highway Pavement Base Layer" (JTG / T F20-2015), with a thickness of 20cm and a top surface flush with the existing concrete base layer 12.

[0028] Preferably, such as Figure 1 As shown, in this embodiment, the thickness of the widened concrete base layer 23 is the same as the thickness of the existing concrete surface layer 13, and the flexural tensile strength of the widened concrete base layer 23 at 28 days is ≥4.5MPa.

[0029] Preferably, such as Figure 1 As shown, in this embodiment, the force transmission rib 3 is a φ25 plain round steel bar with a length of 45cm. One end is inserted into the existing concrete surface layer 13 to a depth of 22.5cm; the other end is inserted into the widened concrete base layer 23 to a depth of 22.5cm. Multiple force transmission ribs 3 are connected between the existing concrete surface layer 13 and the widened concrete base layer 23, and the spacing between the force transmission ribs 3 is 40cm.

[0030] Preferably, such as Figure 1 As shown, in this embodiment, the thickness of the asphalt concrete isolation layer 41 is 4.0 cm, which improves the connection strength between the existing cement concrete road 1 and the asphalt concrete cover 4.

[0031] Preferably, such as Figure 1 As shown, in this embodiment, the thickness of the continuously reinforced concrete slab 42 is 20-24cm, and the flexural tensile strength at 28 days is ≥5.0MPa.

[0032] Compared with the existing technology that uses a thin 1cm thick rubber asphalt stress-absorbing layer to connect the existing cement concrete road 1 and the asphalt concrete surface layer 43, the asphalt concrete isolation layer 41 and the continuously reinforced concrete slab 42 laid between the existing cement concrete road 1 and the asphalt concrete surface layer 43 in this embodiment can withstand a greater load, making it more suitable for roads with higher load requirements. It can also avoid the problem of structural defects on the existing concrete surface layer 13 being reflected to the asphalt concrete surface layer 43 due to heavy loads.

[0033] In some embodiments, the reinforcement of the continuously reinforced concrete slab 42 described above has been optimized, such as... Figure 1 , 3 As shown, the continuously reinforced concrete slab 42 contains multiple longitudinal steel bars 5 and transverse steel bars 6. The longitudinal steel bars 5 and transverse steel bars 6 are threaded steel bars, arranged in a single layer in a cross pattern. The longitudinal steel bars 5 are perpendicular to the road section and have a diameter of 12-20mm. Based on the reinforcement ratio of the continuously reinforced concrete slab 42, they are 0.6%-1.0% and are 9-10cm away from the top surface of the continuously reinforced concrete slab 42. The transverse steel bars 6 are parallel to the road section and are connected below the longitudinal steel bars 5. They are of the same type as the longitudinal steel bars 5 and are spaced 30-60cm apart.

[0034] Specifically, laying multiple longitudinal steel bars 5 and transverse steel bars 6 inside the continuously reinforced concrete slab 42 can significantly enhance the compressive and shear strength of the continuously reinforced concrete slab 42 and improve the service life of the widened and reconstructed composite pavement structure.

[0035] In some embodiments, the asphalt concrete surface layer 43 described above has been optimized, such as... Figure 1 As shown, the asphalt concrete surface layer 43 includes a lower layer 431 and an upper layer 432. A tack coat is provided between the lower layer 431 and the upper layer 432. A tack coat is also provided between the asphalt concrete surface layer 43 and the continuous reinforced concrete slab 42. The tack coat uses emulsified asphalt PC-3 type tack coat, with a dosage of 0.5L / m. 2 .

[0036] Specifically, the lower layer 431 is a 6cm thick medium-grained asphalt concrete AC-20C (SBS modified), with 0.3% anti-rutting agent added, which is beneficial to improving the load-bearing capacity and anti-rutting capacity of the asphalt concrete surface layer 43; The top layer 432 is a 4cm thick SMA-13 ​​asphalt mastic macadam, which has good temperature stability, rutting resistance, crack resistance and durability, and can adapt well to heavy traffic loads.

[0037] Meanwhile, an adhesive layer is provided between the lower layer 431 and the upper layer 432 of the asphalt concrete surface layer 43, and between the asphalt concrete surface layer 43 and the continuously reinforced concrete slab 42, which improves the integrity of the widened and reconstructed composite pavement structure and the connection strength between the old and new pavements.

[0038] The specific construction of a composite pavement structure for widening and retrofitting cement concrete pavement according to this application includes the following steps: Pre-treatment of existing cement concrete road 1: Pre-treatment of existing cement concrete road 1 will be carried out, including excavation of steps. Specifically, such as... Figure 2 As shown, the existing concrete subbase 11, existing concrete base layer 12, and existing concrete surface layer 13 are excavated in sequence to form steps. The existing concrete base layer 12 is wider than the existing concrete subbase 11, and the existing concrete surface layer 13 is wider than the existing concrete base layer 12. The width of each step is controlled between 20 and 25 cm.

[0039] Widening section of roadbed filling: Level and compact the compacted roadbed 21 of the widened concrete road 2 so that the top surface rebound modulus is ≥40MPa.

[0040] Road widening subbase laying: Lay graded crushed stone subbase 22 of widened concrete road 2 with a thickness of 20cm.

[0041] Rebar installation on existing concrete surface layer 13: Tie rods are installed on existing concrete surface layer 13. The force transmission bars 3 are made of φ25 plain round steel bars with a length of 45cm. One end is inserted into the existing concrete surface layer 13 to a depth of 22.5cm. The spacing between the force transmission bars 3 is 40cm.

[0042] Pouring of widened concrete base layer 23: Pouring of widened concrete base layer 23 to make its thickness consistent with the thickness of the existing concrete surface layer 13, and the flexural tensile strength of widened concrete base layer 23 at 28 days of age is ≥4.5MPa.

[0043] Asphalt concrete isolation layer 41 is laid: Asphalt concrete isolation layer 41 is laid across the entire cross section with a thickness of 4.0cm.

[0044] Rebar tying: such as Figure 3As shown, longitudinal reinforcement 5 and transverse reinforcement 6 are tied across the entire cross section. Both are threaded steel bars, arranged in a single layer in a cross pattern. The longitudinal reinforcement 5 is arranged perpendicular to the road section, with a diameter of 12-20mm. Based on the reinforcement ratio of the continuously reinforced concrete slab 42 of 0.6%-1.0%, it is 9-10cm away from the top surface of the continuously reinforced concrete slab 42. The transverse reinforcement 6 is parallel to the road section, connected below the longitudinal reinforcement 5, and has the same type as the longitudinal reinforcement 5. The spacing of the transverse reinforcement 6 is 30-60cm.

[0045] Continuously reinforced concrete slab 42 casting: Continuously reinforced concrete slab 42 is cast across the entire cross section with a thickness of 20-24cm and a flexural tensile strength ≥5.0MPa at 28d age.

[0046] Asphalt concrete surface layer 43 is laid in layers across the entire cross section. The thickness of the lower layer is 6 cm, and the thickness of the upper layer is 4 cm. A tack coat is laid between the lower layer 431 and the upper layer 432. A tack coat is also laid between the asphalt concrete surface layer 43 and the continuous reinforced concrete slab 42. The tack coat uses emulsified asphalt PC-3 type tack coat at a dosage of 0.5 L / m. 2 .

[0047] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A cement concrete pavement widening reconstruction composite pavement structure, characterized by, include: The existing cement concrete road (1) includes an existing concrete subbase (11), an existing concrete base (12), and an existing concrete surface layer (13) laid from bottom to top. The widened concrete road (2) includes a compacted roadbed (21), a graded crushed stone cushion layer (22), and a widened concrete base layer (23) laid from bottom to top. The upper surface of the widened concrete base layer (23) is flush with the upper surface of the existing concrete surface layer (13). Multiple force transmission bars (3), one end of which is connected to the existing concrete surface layer (13) and the other end is connected to the widened concrete base layer (23). Asphalt concrete cover (4), which is laid on top of the existing cement concrete road (1) and the widened concrete road (2), includes an asphalt concrete isolation layer (41), a continuously reinforced concrete slab (42), and an asphalt concrete surface layer (43) laid from bottom to top. The continuously reinforced concrete slab (42) is reinforced.

2. The cement concrete pavement widening reconstruction composite pavement structure according to claim 1, characterized in that, The existing cement concrete road (1) is connected to the widened concrete road (2) at one end in a stepped shape, with a step width of 20-25cm.

3. The cement concrete pavement widening reconstruction composite pavement structure according to claim 1, characterized in that, The top surface resilient modulus of the compacted subgrade (21) of the widened concrete road (2) is ≥40MPa.

4. The cement concrete pavement widening reconstruction composite pavement structure according to claim 1, characterized in that, The graded crushed stone subbase (22) of the widened concrete road (2) has a thickness of 20cm.

5. The cement concrete pavement widening reconstruction composite pavement structure according to claim 1, characterized in that, The flexural strength of the widened concrete base (23) of the widened concrete road (2) at 28 days is ≥4.5MPa.

6. The cement concrete pavement widening reconstruction composite pavement structure according to claim 1, characterized in that, The force transmission bar (3) is made of plain round steel bar with a nominal diameter of 25mm and a length of 45cm; the spacing of the force transmission bar (3) is 40cm.

7. The cement concrete pavement widening reconstruction composite pavement structure according to claim 1, characterized in that, The thickness of the asphalt concrete isolation layer (41) is 4.0 cm.

8. The cement concrete pavement widening reconstruction composite pavement structure according to claim 1, characterized in that, The thickness of the continuously reinforced concrete slab (42) is 20-24cm, and the flexural strength at 28 days is ≥5.0MPa.

9. The cement concrete pavement widening reconstruction composite pavement structure according to claim 1, characterized in that, The reinforcement in the continuously reinforced concrete slab (42) includes multiple longitudinal steel bars (5) and transverse steel bars (6). The longitudinal steel bars (5) and transverse steel bars (6) are threaded steel bars, arranged in a single layer in a cross pattern. The longitudinal steel bars (5) are perpendicular to the road section; the transverse steel bars (6) are parallel to the road section and connected below the longitudinal steel bars (5).

10. The cement concrete pavement widening reconstruction composite pavement structure according to claim 1, characterized in that, The asphalt concrete surface layer (43) comprises a lower layer (431) and an upper layer (432), a bonding layer is arranged between the lower layer (431) and the upper layer (432), and a bonding layer is arranged between the asphalt concrete surface layer (43) and the continuous reinforced concrete slab (42), wherein the bonding layer oil of the bonding layer is PC-3 type emulsified asphalt, and the dosage is 0.5L / m 2 .

Images