CN114960331A - Rigid-flexible composite pavement structure and construction method thereof - Google Patents
Rigid-flexible composite pavement structure and construction method thereof Download PDFInfo
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- CN114960331A CN114960331A CN202210760567.3A CN202210760567A CN114960331A CN 114960331 A CN114960331 A CN 114960331A CN 202210760567 A CN202210760567 A CN 202210760567A CN 114960331 A CN114960331 A CN 114960331A
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C7/00—Coherent pavings made in situ
- E01C7/08—Coherent pavings made in situ made of road-metal and binders
- E01C7/32—Coherent pavings made in situ made of road-metal and binders of courses of different kind made in situ
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C11/00—Details of pavings
- E01C11/22—Gutters; Kerbs ; Surface drainage of streets, roads or like traffic areas
- E01C11/224—Surface drainage of streets
- E01C11/225—Paving specially adapted for through-the-surfacing drainage, e.g. perforated, porous; Preformed paving elements comprising, or adapted to form, passageways for carrying off drainage
- E01C11/226—Coherent pavings
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/60—Planning or developing urban green infrastructure
Abstract
The invention discloses a rigid-flexible composite pavement structure and a construction method thereof, wherein the rigid-flexible composite pavement structure comprises a roadbed, a base layer, a cement concrete slab and a permeable asphalt surface layer which are laid in sequence; the cement concrete slab comprises a plurality of dry concrete slabs, a reserved transition area is arranged on the top surface of each cement concrete slab, and the reserved transition areas are located at the joint between every two adjacent concrete slabs; a high-ductility concrete belt is arranged in the reserved transition area, and the high-ductility concrete belt is formed by pouring high-ductility concrete; a joint filling material belt is arranged below the reserved transition area, extends along the length direction of the reserved transition area and is arranged in a joint between two adjacent concrete plates; horizontal pull rods are arranged below the joint filling material belt and are arranged at intervals along the length direction of a joint between two adjacent concrete plates; the self-healing capacity of the high-ductility concrete belt is fully utilized, and the service performance of the rigid-flexible composite pavement is improved.
Description
Technical Field
The invention belongs to the technical field of pavement engineering, and particularly relates to a rigid-flexible composite pavement structure and a construction method thereof.
Background
The rigid-flexible composite pavement is formed by paving an asphalt mixture surface layer on a cement concrete slab, has the strength and rigidity of a rigid pavement and the comfort of a flexible pavement, and is a typical long-life pavement structure; the cement concrete slab improves the bearing capacity of the road surface, the asphalt surface layer improves the comfort of driving, the service level of the road surface is improved, and the service life of the road surface is prolonged. However, due to the existence of cement concrete slab joints, the rigid-flexible composite pavement is prone to cracking diseases, and the popularization and application of the rigid-flexible composite pavement are limited.
Under the coupling action of temperature stress, dead weight and vehicle load, a certain tensile stress can be generated in the cement concrete slab, and further, the fracture, arch expansion and other damages are generated; in order to avoid the damage, joints in the longitudinal and transverse directions are required to be arranged in the cement concrete slab during the construction process; the joint is often the weakest place of the cement concrete slab, and the joint is easy to break due to the stripping, extrusion and aging of the joint filling material; if rainwater permeates from the joint, phenomena of mud pumping, bottom plate hollowing, slab staggering and the like can occur, even uneven frost heaving can occur in winter, and further the cement concrete slab is deformed; meanwhile, under the action of vehicle load and temperature stress, stress concentration is easy to occur at the joint of the cement concrete slab. Along with the accumulation of stress, a joint develops from bottom to top from the bottom of an asphalt surface layer, finally penetrates through the whole asphalt surface layer and is reflected on an asphalt pavement, so that the pavement is cracked, and the durability and the service performance of the rigid-flexible composite pavement are seriously influenced; in summary, the joint seam in the cement concrete slab in the existing rigid-flexible composite pavement structure is the most important adverse factor affecting the durability and the service performance of the pavement.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides a rigid-flexible composite pavement structure and a construction method thereof, aiming at solving the technical problem that the durability and the service performance of the pavement structure are seriously influenced because longitudinal and transverse seams are arranged in a cement concrete slab in the conventional rigid-flexible composite pavement structure.
In order to achieve the purpose, the invention adopts the technical scheme that:
the invention provides a rigid-flexible composite pavement structure which comprises a roadbed, a base layer, a cement concrete slab and a permeable asphalt surface layer, wherein the roadbed, the base layer, the cement concrete slab and the permeable asphalt surface layer are sequentially paved from bottom to top;
the cement concrete slab comprises a plurality of dry concrete slabs, and the thickness of the cement concrete slab is 20-28 cm; the top surface of the cement concrete slab is provided with a reserved transition area, and the reserved transition area is positioned at a joint between two adjacent concrete slabs; a high-ductility concrete belt is arranged in the reserved transition area, and the high-ductility concrete belt is formed by pouring high-ductility concrete;
a joint filling material belt is arranged below the reserved transition area, extends along the length direction of the reserved transition area and is arranged in a joint between two adjacent concrete plates; horizontal pull rods are arranged below the joint filling material belt and are arranged at intervals along the length direction of a joint between two adjacent concrete plates; one end of the horizontal pull rod is fixedly connected with one concrete plate, and the other end of the horizontal pull rod is fixedly connected with the other concrete plate.
Further, the adhesive also comprises a bonding layer; the bonding layer is arranged between the cement concrete slab and the permeable asphalt surface layer; wherein, the bonding layer is formed by spraying SBS modified emulsified asphalt.
Furthermore, anchoring steel bars are uniformly arranged around the high-ductility concrete belt; one end of the anchoring steel bar is anchored and fixed in the high-ductility concrete belt, and the other end of the anchoring steel bar is anchored and fixed in the concrete slab.
Further, the length of the anchoring steel bar is 10-20cm, and the diameter of the anchoring steel bar is 1.5-2.0 cm; the distance between two adjacent anchoring steel bars is 20-30 cm.
Further, the height of the reserved transition area is half of the thickness of the concrete plate, and the width of the reserved transition area is 40-50 cm.
Furthermore, the height of the joint sealing material belt is 3-5cm, and the width of the joint sealing material belt is 3-8 mm.
Further, the joint filling material belt is cast and molded by adopting a joint filling material; wherein the joint filler is polyurethane joint filler.
Further, the length of the horizontal pull rod is 70-80cm, and the diameter of the horizontal pull rod is 1.4-1.6 cm; the distance between two adjacent horizontal pull rods is 40-60 cm; and the distance between the central line of the horizontal pull rod and the bottom surface of the cement concrete slab is 5-7 cm.
Further, the high-ductility concrete is prepared by mixing portland cement, fly ash, super absorbent resin, quartz sand, water, fiber, a water reducing agent and a retarder; wherein the super absorbent resin is hydrogel particles, the particle size of the hydrogel particles is 75 μm, and the hydrogel particles can absorb a large amount of liquid from the surrounding environment; the permeable asphalt surface layer is formed by paving and rolling a porous asphalt mixture; the porosity of the permeable asphalt surface layer is 18-22%, and the thickness of the permeable asphalt surface layer is 4-10 cm.
The invention also provides a construction method of the rigid-flexible composite pavement structure, which comprises the following steps:
step 1, filling a roadbed;
step 5, pouring high-ductility concrete in the reserved transition area to obtain a high-ductility concrete belt;
and 6, performing permeable asphalt surface layer construction above the cement concrete slab.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a rigid-flexible composite pavement structure and a construction method thereof.A transition area is reserved on the top surface of a cement concrete slab, and a high-ductility concrete belt is arranged in the reserved transition area, so that the excellent ductility and the stronger crack width control capability and self-healing capability of the high-ductility concrete can be fully utilized, a seamless cement concrete slab is formed, and a slab top seam is eliminated; the joint filling material belt and the pull rod are sequentially arranged below the reserved transition area, a mode of combining a lower joint and an upper joint is adopted, the lower joint absorbs the dry shrinkage stress and the temperature shrinkage stress in the joint-free cement concrete slab, the upper high-ductility concrete disperses the cracking deformation at the lower joint into countless micro cracks, and the cracks are blocked from being transmitted to the asphalt surface layer; the high-ductility concrete has the strain hardening characteristic, cracks can be dispersed into countless micro cracks, the width of each micro crack is less than 60 micrometers, and the micro cracks do not influence the strength and the integrity of the high-ductility concrete.
Furthermore, by arranging the anchoring reinforcing steel bars between the high-ductility concrete belt and the concrete plate, the bonding strength between the high-ductility concrete belt and the concrete plate can be effectively improved, and the cracking at the joint part of the high-ductility concrete belt and the concrete plate is avoided.
Furthermore, a permeable asphalt surface layer is laid on the seamless cement concrete slab, rainwater can permeate into the high-ductility concrete belt through the permeable asphalt surface layer, the super absorbent resin in the high-ductility concrete can absorb and store a large amount of rainwater permeated from the permeable asphalt surface layer, and then the rainwater is gradually released into the high-ductility concrete, so that unhydrated cement particles and unreacted fly ash in the high-ductility concrete are promoted to generate secondary hydration reaction and volcanic ash reaction, and generated new hydration products are filled in cracks, so that the self-healing and self-repairing of the microcracks are realized; through the measures, the cement concrete slab top is seamless, the high-ductility concrete belt disperses potential cracks of the cement concrete slab into countless micro cracks, and the cracks are blocked from developing to the permeable asphalt surface layer; meanwhile, under the combined action of the permeable asphalt surface layer, the super absorbent resin, the high-ductility concrete secondary hydration reaction and the volcanic ash reaction, the self-healing and the self-repairing of the seamless cement concrete slab are realized, and the service life of the pavement structure is effectively prolonged.
Drawings
FIG. 1 is a cross-sectional view of a rigid-flexible composite pavement structure according to the present invention;
fig. 2 is a plan view of the rigid-flexible composite pavement structure according to the present invention.
Wherein, 1 road bed, 2 basic units, 3 cement concrete slab, 4 tie coats, 5 permeable asphalt surface course, 6 high ductility concrete area, 7 joint filling material areas, 8 horizontal pull rods, 9 anchor reinforcing bars.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects of the present invention more apparent, the following embodiments further describe the present invention in detail. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 1-2, the invention provides a rigid-flexible composite pavement structure, which comprises a roadbed 1, a base layer 2, a cement concrete slab 3, a bonding layer 4 and a permeable asphalt surface layer 5 which are sequentially paved from bottom to top.
The roadbed 1 is formed by layering and rolling roadbed soil; and the resilience modulus of the top surface of the roadbed 1 is not lower than 40 MPa.
The base layer 2 is arranged on the roadbed 1, and the base layer 2 is formed by layering, paving and rolling cement-stabilized macadam; the thickness of the base layer 2 is 30-36cm, and the base layer is formed by two layers of paving and rolling, wherein the thickness of each paving and rolling layer is 15-18 cm; the cement stabilized macadam is formed by mixing cement, water, coarse aggregate, fine aggregate and filler; preferably, the mass ratio of the coarse aggregate to the fine aggregate to the filler is 75:23:2, the cement dosage is 3.0-4.5% of the mass of the aggregate, and the water content is 5% of the total mass.
The cement concrete 3 is arranged above the base layer 2, the thickness of the cement concrete plate 3 is 20-28cm, and the cement concrete plate 3 comprises a plurality of dry mixed concrete plates; the length of each concrete plate is 4-6m, and the width of each concrete plate is 4-6 m; the concrete plate is formed by pouring common cement concrete in blocks, and the common cement concrete is formed by mixing portland cement, water, sand and graded broken stone; preferably, the mass ratio of the portland cement, water, sand and graded broken stone in the ordinary cement concrete is 1.4: 1: 3.6: 7, and the water-to-glue ratio is 0.41.
A reserved transition area is arranged on the top surface of the cement concrete slab 3 and is positioned at a joint between two adjacent concrete slabs; preferably, the height of the reserved transition area is half of the thickness of the concrete plate, and the width of the reserved transition area is 40-50 cm; and a high-ductility concrete belt 6 is arranged in the reserved transition area, and the high-ductility concrete belt 6 is formed by pouring high-ductility concrete.
The high-ductility concrete is prepared by mixing portland cement, fly ash, super absorbent resin, quartz sand, water, fiber, a water reducing agent and a retarder; preferably, the mass ratio of the portland cement, the fly ash, the super absorbent resin, the quartz sand, the water, the fiber, the water reducing agent and the retarder in the high-ductility concrete is 70: 80: 5: 66: 36: 4: 1: 5; wherein the portland cement is ordinary portland cement with the label of 42.5; wherein the super absorbent resin is hydrogel particles, the particle size of the hydrogel particles is 75 μm, and the hydrogel particles can absorb a large amount of liquid from the surrounding environment; pouring the high-ductility concrete into the reserved transition area, tamping and surface finishing to obtain the high-ductility concrete belt 6.
In the invention, a joint filling material belt 7 is arranged below the reserved transition area, and the joint filling material belt 7 extends along the length direction of the reserved transition area and is arranged in a joint between two adjacent concrete plates; the height of the joint filling material belt 7 is 3-5cm, and the width is 3-8 mm; the joint filling material belt 7 is cast and molded by adopting a joint filling material; wherein the joint filler is polyurethane joint filler.
In the invention, the periphery of the high-ductility concrete belt 6 is uniformly provided with anchoring steel bars 9; one end of the anchoring steel bar 9 is anchored and fixed in the high-ductility concrete belt 6, and the other end of the anchoring steel bar 9 is anchored and fixed in the concrete slab; specifically, half of the length of the anchoring steel bar 9 is embedded in a concrete slab, and the other end of the anchoring steel bar 9 is embedded in the high-ductility concrete belt 6; preferably, the anchoring depth of the anchoring steel bar 9 is located in the middle of the high-ductility concrete belt 6 in the height direction, the length of the anchoring steel bar 9 is 10-20cm, and the diameter of the anchoring steel bar 9 is 1.5-2.0 cm; the distance between two adjacent anchoring steel bars 9 is 20-30 cm.
The bonding layer 4 is arranged between the cement concrete slab 3 and the permeable asphalt surface layer 5; wherein the bonding layer 4 is formed by spraying SBS modified emulsified asphalt, and the spraying amount of the SBS modified emulsified asphalt is 0.8-1.2kg/m 2 。
The permeable asphalt surface layer 5 is laid on the bonding layer 4, and the permeable asphalt surface layer 5 is formed by paving and rolling a porous asphalt mixture; the porosity of the pervious asphalt surface layer 5 is 18-22%, and the thickness is 4-10 cm; when the thickness of the permeable asphalt surface layer 5 is 10cm, the permeable asphalt surface layer 5 is divided into an upper layer and a lower layer; wherein, the upper layer is formed by spreading, rolling and molding a porous asphalt mixture with the maximum nominal grain diameter of 13.2 mm; the lower layer is formed by spreading, rolling and molding a porous asphalt mixture with the maximum nominal grain diameter of 16 mm. When the thickness of the permeable asphalt surface layer 5 is less than 10cm, the permeable asphalt surface layer 5 is a layer and is formed by spreading, rolling and molding a porous asphalt mixture with the maximum nominal particle size of 13.2 mm.
According to the invention, the high-ductility concrete belt is arranged on the top surface of the cement concrete slab, and the excellent ductility, the stronger crack width control capability and the self-healing capability of the high-ductility concrete are fully utilized to be used as a transition area between adjacent concrete slab blocks, so that the two adjacent concrete slab blocks are lapped, the slab top joint of the traditional cement concrete slab is eliminated, and the seamless cement concrete slab is formed; meanwhile, a porous asphalt mixture permeable asphalt surface layer is additionally paved on the seamless cement concrete slab, rainwater permeates into high-ductility concrete, and self-healing and self-repairing of the seamless cement concrete slab are achieved.
According to the rigid-flexible composite pavement structure, the high-ductility concrete has the strain hardening characteristic under the action of uniaxial tension, cracks can be dispersed into countless microcracks, the width of each microcrack is smaller than 60 micrometers, and the microcracks cannot influence the strength of the high-ductility concrete; arranging a lower joint under the high-ductility concrete band as an induction joint, inducing cracks of two adjacent concrete plates generated by temperature shrinkage or drying shrinkage to the lower joint, and dissipating the drying shrinkage stress and the temperature shrinkage stress in the cement concrete slab by virtue of the lower joint; meanwhile, the cracks at the lower part can be upwards expanded to the high-ductility concrete belt, and the cracks generated at the lower part joint are dispersed into countless micro cracks through the excellent crack control capability of the high-ductility concrete, so that the cracks are prevented from expanding to the permeable asphalt surface layer.
According to the invention, the cement concrete slab adopts a mode of combining the lower joint and the upper joint, so that the dry shrinkage stress and the temperature shrinkage stress in the cement concrete slab are absorbed, the transmission of cracks to the permeable asphalt surface layer is blocked, various diseases caused by the joint of the traditional rigid-flexible composite pavement are solved, and the service life of the rigid-flexible composite pavement is prolonged.
In the invention, the unhydrated cement particles and unreacted fly ash in the high-ductility concrete can generate hydration reaction and volcanic ash reaction after encountering water, and the generated new hydration product is filled in the crack, thereby realizing self-healing and self-repairing of the microcracks. The super absorbent resin can absorb and store rainwater permeated by the surface layer and further gradually release the rainwater into the high-ductility concrete, and the high-ductility concrete and self-healing and self-repairing can be realized by moisture released from the super absorbent resin.
The construction method of the rigid-flexible composite pavement structure specifically comprises the following steps:
step 1, filling a roadbed;
adopting roadbed soil to be rolled and formed in a layered manner to obtain a roadbed 1; wherein the resilience modulus of the top surface of the roadbed is not lower than 40 MPa; the concrete construction process of the roadbed is carried out according to the technical specification of highway roadbed construction.
carrying out two-layer rolling on the roadbed 1 by adopting cement stabilized macadam to obtain a base layer 2; wherein the thickness of each rolling layer is not more than 18cm, and the total thickness of the base layer 2 is 30-36 cm.
after the base layer 2 is constructed and maintained for 7d, the construction of the cement concrete slab 3 is started; firstly, designing a steel template according to the size of the cement concrete slab, wherein the width and the height of the steel template are the same as those of the cement concrete slab 3;
marking the position of a reserved transition area according to the design specification of the concrete plate, setting the reserved transition area, and performing template construction;
after the construction of the template is finished, installing the horizontal pull rod at a position 5-7cm away from the bottom surface of the concrete plate according to the design requirement; and the anchoring steel bar is arranged in the middle of the height of the transition area according to the requirement;
mixing the components according to the proportion requirement of the common cement concrete, pouring the mixture into a steel template, tamping the common cement concrete after the pouring is finished, and refitting the surface to form the cement concrete slab with the reserved transition area.
after the cement concrete slab with the reserved transition area is hardened, performing seam covering on a center line at the bottom of the reserved transition area to obtain a lower joint seam; and in the lower joint, filling joint compound to obtain joint compound material belt 7.
And 5, for a plurality of concrete plates, reserving a transition area at the joint of two longitudinally connected concrete plates, and arranging a joint filling material belt, a pull rod and an anchoring steel bar in the same way as in the steps 3 and 4.
and pouring high-ductility concrete in the reserved transition area, tamping and surface finishing to obtain the high-ductility concrete belt.
And 7, bonding layer construction:
after the cement concrete slab and the high-ductility concrete belt are cured for 14 days, spreading SBS modified emulsified asphalt on the surfaces of the cement concrete slab and the high-ductility concrete belt to obtain a bonding layer; wherein the temperature of the SBS modified emulsified asphalt is not lower than 150 ℃, and the spreading dosage is 0.8-1.2kg/m 2 。
After the SBS modified emulsified asphalt is spread, immediately performing permeable asphalt surface layer construction, and spreading and rolling the mixed porous asphalt mixture to form a permeable asphalt surface layer; wherein the porosity of the permeable asphalt surface layer is 18-22%, and the thickness is 4-10 cm; when the thickness is equal to 10cm, the two layers are rolled.
According to the rigid-flexible composite pavement structure and the construction method thereof, the high-ductility concrete belt is arranged between the two adjacent concrete slab blocks to form the seamless concrete slab, so that the slab top joint is eliminated, and various diseases caused by the joint can be effectively prevented; the high-ductility concrete can block the expansion of cracks, so that the durability of the pavement is enhanced, and the service performance of the rigid-flexible composite pavement is improved; through, adopt to set up the bituminous surface layer that permeates water on cement concrete slab, make full use of the self-healing ability of high ductility concrete area that sets up, make the microcrack that has produced carry out self-healing and selfreparing, keep the integrality and the intensity of road surface structure, improve the service performance and reduce the maintenance cost of rigid-flexible combined type road surface.
The above-described embodiment is only one of the embodiments that can implement the technical solution of the present invention, and the scope of the present invention is not limited by the embodiment, but includes any variations, substitutions and other embodiments that can be easily conceived by those skilled in the art within the technical scope of the present invention disclosed.
Claims (10)
1. A rigid-flexible composite pavement structure is characterized by comprising a roadbed (1), a base layer (2), a cement concrete slab (3) and a permeable asphalt surface layer (5) which are sequentially paved from bottom to top;
the cement concrete slab (3) comprises a plurality of dry concrete plates, a reserved transition area is arranged on the top surface of the cement concrete slab (3), and the reserved transition area is positioned at a joint between two adjacent concrete plates; a high-ductility concrete belt (6) is arranged in the reserved transition area, and the high-ductility concrete belt (6) is formed by pouring high-ductility concrete;
a joint filling material belt (7) is arranged below the reserved transition area, the joint filling material belt (7) extends along the length direction of the reserved transition area and is arranged in a joint between two adjacent concrete plates; horizontal pull rods (8) are arranged below the joint filling material belt (7), and the horizontal pull rods (8) are arranged at intervals along the length direction of a joint between two adjacent concrete plates; one end of the horizontal pull rod (8) is fixedly connected with one concrete plate, and the other end of the horizontal pull rod (8) is fixedly connected with the other concrete plate.
2. A rigid-flexible composite pavement structure according to claim 1, further comprising an adhesive layer (4); the bonding layer (4) is arranged between the cement concrete slab (3) and the permeable asphalt surface layer (5); wherein the bonding layer (4) is formed by spraying SBS modified emulsified asphalt.
3. A rigid-flexible composite pavement structure according to claim 1, characterized in that anchoring steel bars (9) are uniformly arranged around the high-ductility concrete strip (6); one end of the anchoring steel bar (9) is anchored and fixed in the high-ductility concrete belt (6), and the other end of the anchoring steel bar (9) is anchored and fixed in the concrete slab.
4. A rigid-flexible composite pavement structure according to claim 3, characterized in that the anchoring reinforcement (9) has a length of 10-20cm and a diameter of 1.5-2.0 cm; the distance between two adjacent anchoring steel bars (9) is 20-30 cm.
5. A rigid-flexible composite pavement structure as set forth in claim 1, wherein said reserved transition area has a height of half the thickness of the concrete slab and a width of 40-50 cm.
6. A rigid-flexible composite pavement structure according to claim 1, characterized in that the height of the joint-filling material strip (7) is 3-5cm and the width is 3-8 mm.
7. A rigid-flexible composite pavement structure according to claim 1, characterized in that the joint compound material tape (7) is formed by pouring joint compound; wherein the joint filler is polyurethane joint filler.
8. A rigid-flexible composite pavement structure according to claim 1, characterized in that said horizontal tie-rods (8) have a length of 70-80cm and a diameter of 1.4-1.6 cm; the distance between two adjacent horizontal pull rods (8) is 40-60 cm; the distance between the central line of the horizontal pull rod (8) and the bottom surface of the cement concrete slab (3) is 5-7 cm.
9. The rigid-flexible composite pavement structure according to claim 1, wherein the high-ductility concrete is prepared by mixing portland cement, fly ash, super absorbent resin, quartz sand, water, fiber, a water reducing agent and a retarder; wherein the super absorbent resin is hydrogel particles, the particle size of the hydrogel particles is 75 μm, and the hydrogel particles can absorb a large amount of liquid from the surrounding environment; the permeable asphalt surface layer (5) is formed by paving and rolling a porous asphalt mixture; the porosity of the permeable asphalt surface layer (5) is 18-22%, and the thickness is 4-10 cm.
10. A construction method of a rigid-flexible composite pavement structure as claimed in any one of claims 1 to 9, comprising the steps of:
step 1, filling a roadbed (1);
step 2, constructing a base layer (2) above the roadbed (1);
step 3, marking the position of a reserved transition area on the top surface of the base layer (2), supporting a template, and installing a horizontal pull rod (8); then, pouring cement concrete, and maintaining to obtain a cement concrete slab with a reserved transition area;
step 4, performing seam-based processing on the bottom central line of the reserved transition area to obtain a lower seam; and a joint filling material belt (7) is arranged at the lower joint;
step 5, pouring high-ductility concrete in the reserved transition area to obtain a high-ductility concrete belt (6);
and 6, constructing a permeable asphalt surface layer above the cement concrete slab (3).
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116463906A (en) * | 2023-05-22 | 2023-07-21 | 河北交投路桥建设开发有限公司 | Construction process and quality control method of non-joint cement concrete pavement |
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| KR102056025B1 (en) * | 2019-05-07 | 2019-12-13 | 김동역 | Construction method and joint filler structure for crack induction of large section concrete |
| CN110965426A (en) * | 2019-12-26 | 2020-04-07 | 中冶南方工程技术有限公司 | Rigid-flexible composite pavement expansion joint structure and construction method thereof |
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| CN116463906A (en) * | 2023-05-22 | 2023-07-21 | 河北交投路桥建设开发有限公司 | Construction process and quality control method of non-joint cement concrete pavement |
| CN116463906B (en) * | 2023-05-22 | 2023-10-13 | 河北交投路桥建设开发有限公司 | Construction process and quality control method of non-joint cement concrete pavement |
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