CN214245181U - Composite modified asphalt cold recycling pavement structure - Google Patents
Composite modified asphalt cold recycling pavement structure Download PDFInfo
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- CN214245181U CN214245181U CN202023129737.3U CN202023129737U CN214245181U CN 214245181 U CN214245181 U CN 214245181U CN 202023129737 U CN202023129737 U CN 202023129737U CN 214245181 U CN214245181 U CN 214245181U
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Abstract
The utility model provides a cold regeneration road surface structure of compound modified asphalt, include from supreme cement concrete layer, the high ductility cement base anticracking layer of laying in proper order, tie coat, geotechnological cloth layer, the compound modified emulsified asphalt of high volume RAP material cold regeneration lower surface course, the compound modified emulsified asphalt of high volume RAP material cold regeneration middle surface course and the modified asphalt concrete upper surface course of mixing down. The utility model discloses in through set gradually under the compound modified emulsified asphalt of high volume RAP material cold regeneration surface course, the compound modified emulsified asphalt of high volume RAP material cold regeneration surface course and the matching that modified asphalt concrete upper surface course realized the modulus, can improve the bearing capacity on road surface and shear, anti rutting performance etc.. Simultaneously, through setting up high ductility cement base anticracking layer and geotechnological cloth layer, can effectively improve road surface structure to the resistance of stress transfer, be favorable to very much suppressing reflection crack's emergence, be favorable to improving road surface structure's security, durability and driving stability.
Description
Technical Field
The utility model relates to a road surface structure field, concretely relates to cold regeneration road surface structure of compound modified asphalt.
Background
At present, traffic pressure is heavy, trucks are seriously overloaded, so the service life of a common high-grade road is usually about ten years, and a low-grade road needs to be renovated even for several years, so a large amount of waste asphalt milling materials are generated, and if the waste asphalt milling materials are not utilized, a large amount of resources are wasted, and environmental pollution is caused. The regenerated waste asphalt concrete is used for road construction, and is an effective means for realizing resource utilization of the waste asphalt concrete. The cold regeneration technology is an effective means for realizing regeneration of the waste asphalt concrete, and the cold regeneration does not need an additional heat source, can be used for mixing and cold construction at normal temperature, does not need heating, saves energy, reduces emission and has good application prospect. However, the performance of the recycled asphalt concrete material is greatly different from that of the conventional hot-mix asphalt concrete material, if the conventional asphalt concrete construction mode and the conventional pavement structure are continuously used, the pavement has the defects of low bearing capacity, low shearing resistance and the like, and the cold recycled asphalt concrete surface layer is more prone to generating defects such as rutting, moving, reflection cracks and the like compared with the conventional concrete surface layer along with the prolonging of time.
Therefore, in order to design a new pavement structure based on the characteristics of cold recycled asphalt concrete, the pavement structure has excellent properties of crack resistance, impact resistance, rutting resistance, wear resistance and the like.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model provides a cold regeneration road surface structure of compound modified asphalt.
The utility model provides a cold regeneration road surface structure of compound modified asphalt, include from supreme cement concrete layer, the high ductility cement base anticracking layer of laying in proper order, tie coat, geotechnological cloth layer, the compound modified emulsified asphalt of high volume RAP material cold regeneration lower surface course, the compound modified emulsified asphalt of high volume RAP material cold regeneration middle surface course and the modified asphalt concrete upper surface course down. The utility model discloses in, the raw materials of high ductility cement base anticracking layer include cement, fly ash, levigated slay, light calcium powder, nanometer SiO2The raw material components are mixed into a mixture; the lower surface layer of the high-doped RAP material composite modified emulsified asphalt for cold regeneration is AC-13, the raw materials of the low-doped RAP material composite modified emulsified asphalt comprise aqueous epoxy emulsion (aqueous epoxy curing agent), road emulsified asphalt, RAP material (asphalt mixture reclaimed material), mineral aggregate and water, and the mixture is prepared by mixing at normal temperature, wherein the amount of RAP material is more than 30%; the high-doped RAP material composite modified emulsified asphalt cold-recycling middle surface layer is AC-20, the raw materials of the high-doped RAP material composite modified emulsified asphalt cold-recycling middle surface layer comprise a composite modifier, road emulsified asphalt, RAP materials, mineral materials and water, the RAP materials are mixed into a mixture at normal temperature, the amount of the RAP materials is more than 30%, and the composite modifier is composed of one or at least two of water-based acrylic acid, water-based acrylic acid modified epoxy resin, water-based polyurethane resin, styrene-butadiene latex, SBS latex and chloroprene latex. The upper surface layer of the modified asphalt concrete is AC-25, and the raw materials of the modified asphalt concrete comprise a composite modifier, road emulsified asphalt, mineral aggregate and water. The raw material of the bonding layer is water-based epoxy resin emulsified asphalt bonding layer oil; the thickness of the bonding layer is about 0.5 mm. The cement concrete layer may be a 5% cement stabilized gravel layer, 4% cement stabilized macadam or cement stabilized gravel or a combination thereof, and the like, depending on the situation of the construction site. The utility model discloses surface course and basic unit's material modulus under well high volume RAP material composite modification emulsified asphalt cold recyclingAnd matching, wherein the modulus of the middle surface layer of the high-doped RAP composite modified emulsified asphalt in cold regeneration is more matched with that of the upper surface layer of the flexible modified concrete. The modulus matching is realized by sequentially arranging the low surface layer of the high-doped RAP composite modified emulsified asphalt in cold regeneration, the middle surface layer of the high-doped RAP composite modified emulsified asphalt in cold regeneration and the upper surface layer of the modified asphalt concrete, so that the interface strength can be improved, and the bearing capacity, shearing resistance, rutting resistance and the like of the pavement are improved. Meanwhile, by arranging the high-ductility cement-based crack-resistant layer and the geotextile layer, a multi-fiber layer structure is formed by utilizing the reinforcing fibers in the high-ductility cement-based material and the geotextile, the resistance effect of the road and pavement structure on stress transfer can be effectively improved, the generation of reflection cracks is favorably inhibited, and the safety, durability and driving stability of the road and pavement structure are favorably improved. The utility model discloses surface course and high volume RAP material composite modified emulsified asphalt cold recycling in surface course and the high volume RAP material composite modified emulsified asphalt cold recycling under well high volume RAP material adopt RAP as the raw materials, regenerates original RAP and gathers materials for usable regeneration, through adding modifier modified emulsified asphalt, effectively improves the use volume of mixing of RAP, reduces road construction cost, improves the road performance of cold regeneration mixture simultaneously, enlarges its application horizon in road structure, extension road life.
Furthermore, a honeycomb framework is pre-embedded in the surface layer in the cold regeneration of the high-doping-amount RAP material composite modified emulsified asphalt, the honeycomb framework is of a honeycomb structure with a negative Poisson's ratio effect, and the honeycomb framework is formed by connecting a plurality of cells with concave hexagonal sections. The honeycomb framework is provided with a plurality of concave hexagonal holes and trapezoidal holes. The embedded honeycomb framework can play a role in toughening and reinforcing, and the concave honeycomb framework structure with the negative Poisson's ratio effect has higher compression modulus and yield strength, excellent shock wave attenuation characteristic and better attenuation effect on shock waves. The honeycomb framework is made of high-density polyethylene plastic.
Furthermore, a three-dimensional porous framework is pre-embedded in the upper surface layer of the modified asphalt concrete, the communication porosity of the three-dimensional porous framework is 80% -95%, and the pore diameter of the three-dimensional porous framework is 5-30 mm. The three-dimensional porous framework is formed by weaving or bonding polyvinyl alcohol fibers. And pouring the modified asphalt concrete on the three-dimensional porous framework to ensure that the modified asphalt concrete is densely filled in the three-dimensional through holes of the three-dimensional porous framework to form a network interwoven compact structure. The three-dimensional porous framework and the modified asphalt concrete are mutually interpenetrated and intersected into a whole, the modified asphalt concrete forms encircling locking in the three-dimensional porous framework, a good reinforcing effect is achieved, the interface bonding strength is high, the materials are mutually constrained and mutually reinforced, the formed structure is strong in integrity, the strength and the yield stress of the structure are obviously improved, the integral strength and the hardness of a pavement structure are improved, and meanwhile, the pavement structure has good toughness.
Further, the thickness of the cement concrete layer is 20-40 cm.
Further, the thickness of the high-ductility cement-based crack resistant layer is 1-1.5 cm.
Further, the thickness of the geotextile layer is 1-2 mm.
Further, the thickness of the lower surface layer of the high-mixing-amount RAP material composite modified emulsified asphalt in cold regeneration is 6-8cm, and the thickness of the middle surface layer of the high-mixing-amount RAP material composite modified emulsified asphalt in cold regeneration is 5-6 cm.
Further, the thickness of the upper surface layer of the modified asphalt concrete is 4-5 cm.
The utility model has the advantages that: the utility model discloses in through set gradually under the compound modified emulsified asphalt of high volume RAP material cold regeneration surface course, the compound modified emulsified asphalt of high volume RAP material cold regeneration surface course and the matching that modified asphalt concrete upper surface course realized the modulus, can improve interfacial strength, improve the bearing capacity on road surface and shear, anti rutting performance etc.. Meanwhile, by arranging the high-ductility cement-based crack-resistant layer and the geotextile layer, a multi-fiber layer structure is formed by utilizing the reinforcing fibers in the high-ductility cement-based material and the geotextile, the resistance effect of the road and pavement structure on stress transfer can be effectively improved, the generation of reflection cracks is favorably inhibited, and the safety, durability and driving stability of the road and pavement structure are favorably improved.
The utility model discloses surface course and high volume RAP material composite modified emulsified asphalt cold recycling in surface course and the high volume RAP material composite modified emulsified asphalt cold recycling under well high volume RAP material adopt RAP as the raw materials, regenerates original RAP and gathers materials for usable regeneration, through adding modifier modified emulsified asphalt, effectively improves the use volume of mixing of RAP, reduces road construction cost, improves the road performance of cold regeneration mixture simultaneously, enlarges its application horizon in road structure, extension road life.
Drawings
The invention will be further described with reference to the following figures and examples:
FIG. 1 is a schematic structural diagram of the composite modified asphalt cold recycling pavement structure of the present invention;
FIG. 2 is a schematic structural view of a honeycomb frame;
FIG. 3 is a schematic illustration of a three-dimensional porous skeleton;
in the figure:
1. the concrete comprises a cement concrete layer, 2 a high-ductility cement-based crack resistant layer, 3 a bonding layer, 4 a geotextile layer, 5 a high-mixing-amount RAP material composite modified emulsified asphalt cold-recycling lower surface layer, 6 a high-mixing-amount RAP material composite modified emulsified asphalt cold-recycling middle surface layer and 7 a modified asphalt concrete upper surface layer.
Detailed Description
The composite modified asphalt cold-recycling pavement structure provided by the embodiment comprises a cement concrete layer 1, a high-ductility cement-based anti-cracking layer 2, a bonding layer 3, a geotextile layer 4, a low cold-recycling surface layer 5 of high-doping-amount RAP material composite modified emulsified asphalt, a medium cold-recycling surface layer 6 of high-doping-amount RAP material composite modified emulsified asphalt and a high surface layer 7 of modified asphalt concrete which are sequentially paved from bottom to top. In this embodiment, the high-ductility cement-based crack-resistant layer 2 is prepared from cement, fly ash, ground slag, light calcium powder, and nano SiO2The raw material components are mixed into a mixture; the lower cold-regeneration layer 5 of the high-doped RAP composite modified emulsified asphalt is AC-13, and the raw materials of the lower cold-regeneration layer comprise aqueous epoxy emulsion (aqueous epoxy curing agent) and roadEmulsified asphalt, RAP (reclaimed asphalt mixture), mineral aggregate and water are mixed into a mixture at normal temperature, and the amount of the RAP is more than 30%; the cold regeneration middle surface layer 6 of the high-mixing-amount RAP material composite modified emulsified asphalt is AC-20, the raw materials of the high-mixing-amount RAP material composite modified emulsified asphalt comprise a composite modifier, road emulsified asphalt, RAP materials, mineral aggregates and water, the mixture is mixed at normal temperature, the amount of the RAP materials is more than 30%, and the composite modifier is composed of one or at least two of water-based acrylic acid, water-based acrylic acid modified epoxy resin, water-based polyurethane resin, styrene-butadiene latex, SBS latex and neoprene latex. The upper layer 7 of the modified asphalt concrete is AC-25, and the raw materials of the modified asphalt concrete comprise a composite modifier, road emulsified asphalt, mineral aggregate and water. The raw material of the bonding layer 3 is water-based epoxy resin emulsified asphalt bonding layer oil; the thickness of the bonding layer 3 is about 0.5 mm. The cement concrete layer 1 may be a 5% cement stabilized gravel layer, 4% cement stabilized crushed stone or cement stabilized gravel or a combination thereof, or the like, depending on the situation of the construction site. In the embodiment, the modulus of the lower layer 5 of the high-doped RAP composite modified emulsified asphalt in cold regeneration is matched with that of the base material, and the modulus of the upper layer 6 of the high-doped RAP composite modified emulsified asphalt in cold regeneration is more matched with that of the upper layer of the flexible modified concrete. The modulus matching is realized by sequentially arranging the low cold-recycling surface layer 5 of the high-doping-amount RAP material composite modified emulsified asphalt, the middle cold-recycling surface layer 6 of the high-doping-amount RAP material composite modified emulsified asphalt and the upper surface layer 7 of the modified asphalt concrete, so that the interface strength can be improved, and the bearing capacity, the shearing resistance, the rutting resistance and the like of a pavement can be improved. Meanwhile, by arranging the high-ductility cement-based crack resistant layer 2 and the geotextile layer 4, a multi-fiber layer structure is formed by utilizing the reinforcing fibers in the high-ductility cement-based material and the geotextile, the resistance effect of the road and pavement structure on stress transfer can be effectively improved, the generation of reflection cracks is favorably inhibited, and the safety, durability and driving stability of the road and pavement structure are favorably improved. In the embodiment, the lower surface layer 5 for cold regeneration of the high-doping-amount RAP composite modified emulsified asphalt and the upper surface layer 6 for cold regeneration of the high-doping-amount RAP composite modified emulsified asphalt adopt RAP as a raw material, the original RAP is regenerated into usable regenerated aggregate, the modified emulsified asphalt is added with a modifier, the use doping amount of the RAP is effectively improved, the road construction cost is reduced, and meanwhile, the modified emulsified asphalt is modifiedThe cold recycling mixture has good road performance, the application position of the cold recycling mixture in a road structure is expanded, and the service life of the road is prolonged.
In this embodiment, a honeycomb framework is pre-embedded in the middle surface layer 6 of the high-doping-amount RAP composite modified emulsified asphalt cold regeneration, the honeycomb framework is of a honeycomb structure with a negative poisson ratio effect, and the honeycomb framework is formed by connecting a plurality of cells with concave hexagonal sections. The honeycomb framework is provided with a plurality of concave hexagonal holes and trapezoidal holes. The embedded honeycomb framework can play a role in toughening and reinforcing, and the concave honeycomb framework structure with the negative Poisson's ratio effect has higher compression modulus and yield strength, excellent shock wave attenuation characteristic and better attenuation effect on shock waves. The honeycomb framework is made of high-density polyethylene plastic.
In the embodiment, a three-dimensional porous skeleton is pre-embedded in the upper layer 7 of the modified asphalt concrete, the communication porosity of the three-dimensional porous skeleton is 80-95%, and the pore diameter of the three-dimensional porous skeleton is 5-30 mm. The three-dimensional porous framework is formed by weaving or bonding polyvinyl alcohol fibers. And pouring the modified asphalt concrete on the three-dimensional porous framework to ensure that the modified asphalt concrete is densely filled in the three-dimensional through holes of the three-dimensional porous framework to form a network interwoven compact structure. The three-dimensional porous framework and the modified asphalt concrete are mutually interpenetrated and interleaved into a whole, the modified asphalt concrete forms surrounding locking in the three-dimensional porous framework, a good reinforcing effect is achieved, the interface bonding strength is high, the materials are mutually constrained and mutually reinforced, the formed structure is strong in integrity, the strength and the yield stress of the structure are obviously improved, the overall strength and the hardness of a pavement structure are improved, and meanwhile, the pavement structure has good toughness.
In this embodiment, the thickness of the cement concrete layer 1 is 20-40 cm.
In this embodiment, the thickness of the high ductility cement-based crack resistance layer 2 is 1 to 1.5 cm.
In this embodiment, the thickness of the geotextile layer 4 is 1-2 mm.
In the embodiment, the thickness of the lower surface layer 5 of the high-doped RAP material composite modified emulsified asphalt in the cold regeneration is 6-8cm, and the thickness of the surface layer 6 of the high-doped RAP material composite modified emulsified asphalt in the cold regeneration is 5-6 cm.
In this embodiment, the thickness of the upper surface layer 7 of the modified asphalt concrete is 4-5 cm.
Finally, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the present invention can be modified or replaced by other means without departing from the spirit and scope of the present invention, which should be construed as limited only by the appended claims.
Claims (8)
1. The utility model provides a cold regeneration road surface structure of compound modified asphalt which characterized in that: the concrete cold-recycling composite asphalt comprises a cement concrete layer, a high-ductility cement-based crack-resistant layer, a bonding layer, a geotextile layer, a high-dosage RAP material composite modified emulsified asphalt cold-recycling lower surface layer, a high-dosage RAP material composite modified emulsified asphalt cold-recycling middle surface layer and a modified asphalt concrete upper surface layer which are sequentially paved from bottom to top.
2. The composite modified asphalt cold recycling pavement structure according to claim 1, characterized in that: a honeycomb framework is pre-embedded in the surface layer in the cold regeneration of the high-doping-amount RAP material composite modified emulsified asphalt, the honeycomb framework is of a honeycomb structure with a negative Poisson ratio effect, and the honeycomb framework is formed by connecting a plurality of cells with concave hexagonal sections.
3. The composite modified asphalt cold recycling pavement structure according to claim 1, characterized in that: a three-dimensional porous framework is pre-embedded in the upper surface layer of the modified asphalt concrete, the communication porosity of the three-dimensional porous framework is 80% -95%, and the pore diameter of the three-dimensional porous framework is 5-30 mm.
4. The composite modified asphalt cold recycling pavement structure according to claim 1, characterized in that: the thickness of the cement concrete layer is 20-40 cm.
5. The composite modified asphalt cold recycling pavement structure according to claim 1, characterized in that: the thickness of the high-ductility cement-based crack resistance layer is 1-1.5 cm.
6. The composite modified asphalt cold recycling pavement structure according to claim 1, characterized in that: the thickness of the geotextile layer is 1-2 mm.
7. The composite modified asphalt cold recycling pavement structure according to claim 1, characterized in that: the thickness of the lower surface layer of the high-mixing-amount RAP material composite modified emulsified asphalt in cold regeneration is 6-8cm, and the thickness of the middle surface layer of the high-mixing-amount RAP material composite modified emulsified asphalt in cold regeneration is 5-6 cm.
8. The composite modified asphalt cold recycling pavement structure according to claim 1, characterized in that: the thickness of the upper surface layer of the modified asphalt concrete is 4-5 cm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202023129737.3U CN214245181U (en) | 2020-12-23 | 2020-12-23 | Composite modified asphalt cold recycling pavement structure |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202023129737.3U CN214245181U (en) | 2020-12-23 | 2020-12-23 | Composite modified asphalt cold recycling pavement structure |
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| CN214245181U true CN214245181U (en) | 2021-09-21 |
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