CN213625024U - Cold regeneration road surface structure of emulsified asphalt - Google Patents
Cold regeneration road surface structure of emulsified asphalt Download PDFInfo
- Publication number
- CN213625024U CN213625024U CN202022330318.XU CN202022330318U CN213625024U CN 213625024 U CN213625024 U CN 213625024U CN 202022330318 U CN202022330318 U CN 202022330318U CN 213625024 U CN213625024 U CN 213625024U
- Authority
- CN
- China
- Prior art keywords
- asphalt
- layer
- surface layer
- cold
- emulsified
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000010426 asphalt Substances 0.000 title claims abstract description 269
- 230000008929 regeneration Effects 0.000 title claims abstract description 49
- 238000011069 regeneration method Methods 0.000 title claims abstract description 49
- 239000010410 layer Substances 0.000 claims abstract description 102
- 239000002344 surface layer Substances 0.000 claims abstract description 78
- 239000000203 mixture Substances 0.000 claims abstract description 54
- 238000004064 recycling Methods 0.000 claims abstract description 32
- 239000004568 cement Substances 0.000 claims abstract description 20
- 238000005056 compaction Methods 0.000 claims description 16
- 239000012790 adhesive layer Substances 0.000 claims description 11
- 239000011230 binding agent Substances 0.000 claims 1
- 238000010276 construction Methods 0.000 abstract description 32
- 230000036541 health Effects 0.000 abstract description 6
- 238000007789 sealing Methods 0.000 abstract description 4
- 238000003825 pressing Methods 0.000 description 35
- 238000003801 milling Methods 0.000 description 33
- 238000005096 rolling process Methods 0.000 description 27
- 239000000463 material Substances 0.000 description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 20
- 230000003068 static effect Effects 0.000 description 17
- 238000000034 method Methods 0.000 description 16
- 238000003892 spreading Methods 0.000 description 15
- 230000007480 spreading Effects 0.000 description 15
- 239000002245 particle Substances 0.000 description 14
- 229910052500 inorganic mineral Inorganic materials 0.000 description 10
- 239000011707 mineral Substances 0.000 description 10
- 239000000843 powder Substances 0.000 description 10
- 230000008569 process Effects 0.000 description 7
- 239000004575 stone Substances 0.000 description 7
- 238000002156 mixing Methods 0.000 description 6
- 239000002994 raw material Substances 0.000 description 6
- 238000004140 cleaning Methods 0.000 description 4
- 238000005507 spraying Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 238000012546 transfer Methods 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- 239000002023 wood Substances 0.000 description 3
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 2
- 235000019738 Limestone Nutrition 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 235000011941 Tilia x europaea Nutrition 0.000 description 2
- 239000011384 asphalt concrete Substances 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 201000010099 disease Diseases 0.000 description 2
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000004571 lime Substances 0.000 description 2
- 239000006028 limestone Substances 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000008439 repair process Effects 0.000 description 2
- 238000005204 segregation Methods 0.000 description 2
- 238000004904 shortening Methods 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000007580 dry-mixing Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000001141 propulsive effect Effects 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 238000007873 sieving Methods 0.000 description 1
- 238000003900 soil pollution Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- 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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Landscapes
- Road Paving Structures (AREA)
Abstract
The utility model discloses an emulsified asphalt cold recycling pavement structure, which comprises a compacted structure and a new paving structure, wherein a seam is arranged between the compacted structure and the new paving structure, and the compacted structure and the new paving structure respectively comprise an asphalt upper surface layer, an asphalt middle surface layer, an asphalt lower surface layer, a sealing layer and a pavement layer from top to bottom; the upper layer of the asphalt is SMA-13 type asphalt with the thickness of 4 cm; the middle surface layer of the asphalt is AC-20 type asphalt with the thickness of 6 cm; the lower surface layer of the asphalt is AC-25 type asphalt with the thickness of 8 cm; the seal layer is SBS modified asphalt; the road base layer comprises an emulsified asphalt cold regeneration base layer, a cement stabilized macadam base layer and a cement stabilized macadam subbase layer; the emulsified asphalt cold regeneration base layer is an emulsified asphalt cold regeneration mixture, and the thickness of the emulsified asphalt cold regeneration base layer is 10 cm; the utility model discloses can shorten 5 ~ 7 days's health preserving time among the prior art to 3 days, obviously reduce the engineering time, and then reduce construction cost.
Description
Technical Field
The utility model relates to a highway engineering road surface construction technical field, especially a cold regeneration road surface structure of emulsified asphalt.
Background
With the rapid development of economic society in China, the traffic flow is increasing day by day, the highway built in early stage gradually enters the major repair, middle repair, reconstruction or extension period, and a large amount of digging and milling asphalt pavement materials are abandoned in the construction, so that on one hand, the environmental pollution is caused, and on the other hand, the resource waste is caused. If the waste asphalt pavement materials can be recycled after being recycled, at least billions of yuan of material cost can be saved every year, and the promotion of green construction is facilitated. Therefore, the emulsified asphalt is produced by applying the cold recycling construction technology.
Because the emulsified asphalt cold-recycling pavement needs to be subjected to curing forming independently under the general condition, namely after the emulsified asphalt cold-recycling pavement is compacted, static curing is required on site, and sufficient time is given to the emulsified asphalt cold-recycling pavement for demulsification and hardening to gradually form strength; in the prior art, the pavement maintenance time is generally 5-7 days, the pavement is hardened after the maintenance is finished, and the last pavement structure layer of the structure layer can be continuously constructed after the core is completely removed. Traffic safety control is needed during the curing period, the rolling damage of large vehicles is prevented, and due to the fact that the construction period of highway reconstruction and extension projects is short, the construction task is heavy, the efficiency of the original construction process is low, and the new trend requirements cannot be met.
Therefore, a construction method is needed to shorten the curing time and accelerate the construction progress in the cold recycling construction process of the emulsified asphalt.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing an emulsified asphalt cold-recycling pavement structure, which solves the technical problem of shortening the life-preserving period of the emulsified asphalt cold-recycling pavement in the prior art; the technical problem of how to eliminate the internal stress of the modified asphalt road and effectively slow down the cracks of the pavement is solved; how to improve the stability of an emulsified asphalt cold recycling pavement structure while maintaining the health quickly.
In order to achieve the purpose, the utility model provides an emulsified asphalt cold recycling pavement structure, which comprises a compacted structure and a new paving structure, wherein a joint is arranged between the compacted structure and the new paving structure, and the joint is lapped by paving adhesive layer asphalt; the compacted structure comprises an asphalt upper surface layer, an asphalt middle surface layer, an asphalt lower surface layer, a seal coat and a road base layer from top to bottom; the new paving structure comprises an asphalt upper surface layer, an asphalt middle surface layer, an asphalt lower surface layer, a sealing layer and a road base layer from top to bottom; wherein the upper asphalt layer is SMA-13 type asphalt with the thickness of 4 cm; the asphalt middle surface layer is AC-20 type asphalt, and the thickness of the asphalt middle surface layer is 6 cm; the lower asphalt surface layer is AC-25 type asphalt with the thickness of 8 cm; the seal layer is SBS modified asphalt; the roadbed comprises an emulsified asphalt cold regeneration base course, a cement stabilized macadam base course and a cement stabilized macadam subbase course; the emulsified asphalt cold regeneration base layer is an emulsified asphalt cold regeneration mixture, and the thickness of the emulsified asphalt cold regeneration base layer is 10 cm; the thickness of the cement-stabilized macadam base layer is 36cm, and the thickness of the cement-stabilized macadam base layer is 18 cm.
Furthermore, the joint of road surface structure is inseparable, connects smoothly, must not produce obvious joint segregation, and between surface course in pitch upper surface course and the pitch, all should transversely misplace between surface course under pitch and the pitch and lay, and then form horizontal joint, and dislocation length is no less than 1 m.
Further, the emulsified asphalt cold-recycling mixture comprises the following components in parts by weight: milling and planing 10-20 mm asphalt: 41 parts of (1); milling and planing 5-10 mm asphalt: 19 parts of a mixture; milling and planing 0-5 mm asphalt: 27 parts of (1); 10-20 mm coarse aggregate: 10 parts of (A); mineral powder: 3 parts of a mixture; cement: 1.5 parts; emulsified asphalt: 3.8 parts; water: 3.3 parts.
Furthermore, aggregate in the SBS modified asphalt adopts limestone macadam with the thickness of 5-10 mm, the using amount of asphalt is 1.0-1.2 kg per square meter, and the using amount of aggregate is 5kg per square meter; the coverage rate of SBS modified asphalt in the seal layer is not less than 70%.
Further, the SMA-13 type asphalt is fine grain type asphalt concrete.
Further, the raw material of the AC-20 type asphalt comprises the following components in parts by weight: 22-32 mm coarse aggregate: 5 parts of 16-22 mm coarse aggregate: 15 parts of coarse aggregate with the particle size of 11-16 mm: 22 parts of fine aggregate with the particle size of 6-11 mm: 18 parts of fine aggregate with the thickness of 3-6 mm: 11 parts of fine aggregate with the particle size of 0-3 mm: 25 parts of mineral powder: 4 parts of a mixture; asphalt: 4.4 parts.
Further, the raw material of the AC-25 type asphalt comprises the following components in parts by weight: 20-30 mm coarse aggregate: 18 parts of 10-20 mm coarse aggregate, 21 parts of 5-10 mm coarse aggregate, 4 parts of 3-5 mm fine aggregate, 24 parts of 0-3 mm fine aggregate, 3 parts of mineral powder (internal reference lime powder) and 4.1 parts of asphalt.
Further, the water content of the cold regeneration base layer of the emulsified asphalt is lower than 2%.
Furthermore, the asphalt upper surface layer, the asphalt middle surface layer, and the asphalt middle surface layer are all distributed with the viscous layer oil.
Further, the adhesive layer oil is sprinkled through the asphalt sprinkling vehicle, the asphalt sprinkling vehicle keeps stable speed and sprinkling quantity when sprinkling the adhesive layer oil, and keeps the whole sprinkling width even, thereby ensuring the sprinkling effect of the first adhesive layer and the second adhesive layer, and further ensuring the construction quality of the asphalt pavement.
Furthermore, the layer-bonding oil enables the adjacent two asphalt structure layers to be tightly connected, so that the asphalt upper surface layer and the asphalt middle surface layer are tightly connected, and the asphalt middle surface layer and the asphalt lower surface layer are tightly connected.
Furthermore, penetrating layer oil is distributed between the sealing layer and the road base layer.
Further, the seam is stepped.
Further, the overlapping length of the seam is not less than 3 m.
Further, the compacted structure has a degree of compaction of at least 98%.
Further, the porosity of the compacted structure is no greater than 12%.
Furthermore, the utility model also provides a quick health preserving method of cold regeneration road surface structure of emulsified asphalt, the step is as follows.
The method comprises the following steps: and (5) treating the diseases of the old asphalt pavement.
s 1: and (4) milling old asphalt pavement layer by layer according to the construction drawing, collecting asphalt milling materials after milling.
s 2: cleaning the crack, and cleaning the pavement at least within 16cm of the two sides of the crack. And drying the road surface.
s 3: and grouting cement slurry along the crack, and additionally arranging an anti-cracking paste.
Step two: and (5) constructing the cold regeneration base layer of the emulsified asphalt.
s 1: and (4) dividing the asphalt milling material obtained in the step (s 1) into three types according to the particle size by using a screen, wherein the particle size of the first type of asphalt milling material is 10-20 mm, the particle size of the second type of asphalt milling material is 5-10 mm, and the particle size of the third type of asphalt milling material is 0-5 mm.
s 2: mixing and processing the following raw materials in parts by weight to form an emulsified asphalt cold-recycling mixture: milling and planing 10-20 mm asphalt: 41 parts of (1); milling and planing 5-10 mm asphalt: 19 parts of a mixture; milling and planing 0-5 mm asphalt: 27 parts of (1); 10-20 mm coarse aggregate: 10 parts of (A); mineral powder: 3 parts of a mixture; cement: 1.5 parts; emulsified asphalt: 3.8 parts; water: 3.3 parts.
s 3: paving an emulsified asphalt cold regeneration mixture to form an emulsified asphalt cold regeneration base layer, a cement stabilized macadam base layer and a cement stabilized macadam subbase layer; spreading prime coat oil on a base course of the pavement to form a prime coat, and spreading SBS modified asphalt on the prime coat to form a seal coat; the spreading speed of the SBS modified asphalt is 2-3 m/min.
s 4: after paving, primarily pressing the road surface, and rolling for 1 time by using a double-steel-wheel road roller at the rolling speed of 1.5-3 km/h.
s 5: after the initial pressing is finished, re-pressing the road surface, and rolling for 2 times by using a single steel wheel road roller, wherein the compaction speed is 1.5-3 km/h; and rolling the road surface for 10 times by using a rubber-tyred road roller, wherein the rolling speed is 2-4 km/h.
s 6: and (5) after the re-pressing is finished, performing final pressing on the road surface, and performing static pressure for 2 times by using a double-steel-wheel road roller, wherein the static pressure speed is 2-4 km/h.
Step three: paving an asphalt lower surface layer; spreading an AC-25 type asphalt mixture with the temperature of 150-165 ℃ above a seal coat; firstly, carrying out static pressure 1 time by using a double-steel-wheel road roller, and then rolling 3 times by using a double-steel-wheel vibratory road roller to finish primary pressing, wherein the primary pressing temperature is not lower than 140 ℃; the re-pressing is carried out for not less than 4 times by using a rubber-tyred roller, and the re-pressing temperature is not lower than 110 ℃; carrying out final pressing after the re-pressing is finished, and carrying out static pressing for 2 times by using a double-steel-wheel road roller; the temperature of the pavement is not lower than 80 ℃ after the final pressure is finished; the joint between the compacted structure and the newly laid structure is processed.
Step four: and when the temperature of the road surface is lower than 50 ℃, coring detection is carried out by using a drilling core-taking machine.
Step five: and (5) detecting to be qualified, and spraying the viscous layer oil by using an asphalt spraying vehicle.
Step six: paving an asphalt middle surface layer; spreading the AC-20 asphalt mixture with the temperature of 175-185 ℃ above the second adhesive layer; rolling for 1 time by using a paver, then rolling for 1 time by using a double-steel-wheel road roller, intermittently sprinkling water by a sprinkling device in the rolling process, and finishing primary pressing at the primary pressing temperature of not less than 160 ℃; re-pressing for 4 times by using a rubber-tyred roller, wherein the re-pressing temperature is not lower than 140 ℃; carrying out static pressure for 2 times at the speed of 3-4 km/h by using a double-steel-wheel road roller at final pressure, wherein the pavement temperature is not lower than 110 ℃ after the final pressure is finished; the joint between the compacted structure and the newly laid structure is processed.
Step seven: and spreading the viscous layer oil by using an asphalt spreading vehicle.
Step eight: paving an asphalt upper surface layer; paving the SMA-13 asphalt mixture above the second adhesive layer; the joint between the compacted structure and the newly laid structure is processed.
Further, in the second step and the third step, when the rolling of the emulsified asphalt cold-recycling mixture is finished, the emulsified asphalt cold-recycling base layer does not form the final strength; and (5) waiting for 0.5-1 h until the strength of the emulsified asphalt cold regeneration base layer is qualified, and then paving an asphalt lower surface layer.
The technical principle of the utility model is that: the water content in the emulsified asphalt cold-recycling mixture is larger just after the construction, and more communicated gaps are formed in the emulsified asphalt cold-recycling mixture due to the existence of water. With the increase of the curing time, the water in the emulsified asphalt cold-recycling mixture is gradually dissipated, and the emulsified asphalt is gradually demulsified. When the emulsified asphalt cold regeneration base layer is paved with an asphalt upper surface layer, an asphalt middle surface layer and an asphalt lower surface layer, the emulsified asphalt cold regeneration base layer is further compacted due to the heat conduction of the asphalt upper surface layer, the asphalt middle surface layer and the asphalt lower surface layer and the work transfer of initial pressure, re-pressure and final pressure of each asphalt surface layer, so that the density of the emulsified asphalt cold regeneration base layer is gradually increased, and the stability of a pavement structure is gradually enhanced.
The beneficial effects of the utility model are embodied in.
1, the utility model provides a pair of cold regeneration road surface structure of emulsified asphalt retrieves old and useless road surface material, is about to pitch mill plane material and is used for preparing the cold regeneration mixture of emulsified asphalt, and each item performance index of this mixture satisfies road-used requirement, reduces the exploitation of building stones when saving project cost, has extensive popularization and application prospect. A large amount of land and mineral resources are saved, the ecological environment is protected, and the green construction is promoted; the construction is simple, the progress is fast, the traffic is opened early, the influence on the traffic is small, and the method is particularly suitable for reconstruction and upgrade of old roads with heavy traffic.
2, the utility model provides a pair of cold regeneration road surface structure of emulsified asphalt, notch cuttype seam make the gap between surface course, the pitch middle surface course under the pitch fill more closely knit to fill through the lapped form, make road surface structure's water-proof effects improve to some extent, further guaranteed the cold regeneration road surface structural stability of emulsified asphalt, thereby improve the life of road surface body.
3, the utility model provides a pair of cold regeneration road surface structure of emulsified asphalt, adopt the cold regeneration technique of emulsified asphalt, can reduce the soil pollution that the old pitch road surface material of abandonment brought, reduce the development of non-renewable resources, reduce the consumption of the heating energy, show and reduce CO2, the emission of harmful substance such as SO2, reduce building rubbish, be favorable to site constructor's healthy, energy-concerving and environment-protective, reduce the expense of destroying building rubbish, can utilize under the prerequisite of former road surface structure and road surface material to the utmost, resume life and the current service level that improves the road surface even.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the invention. The primary objects and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of a middle step seam of the present invention.
Fig. 2 is a schematic cross-sectional view of the present invention.
Reference numerals: 1-asphalt upper surface layer, 2-asphalt middle surface layer, 3-asphalt lower surface layer, 4-seal layer, 5.1-emulsified asphalt cold regeneration base layer, 5.2-cement stabilized macadam base layer, 5.3-cement stabilized macadam subbase layer, 6-compacted structure, 7-new pavement structure and 8-seam.
Detailed Description
The technical solutions of the present invention are described in detail below by way of examples, which are only exemplary and can be used only for explaining and explaining the technical solutions of the present invention, but not for explaining the limitations of the technical solutions of the present invention.
As shown in fig. 1-2, the utility model provides an emulsified asphalt cold recycling pavement structure, which comprises a compacted structure 6 and a new paved structure 7, wherein a joint 8 is arranged between the compacted structure 6 and the new paved structure 7, and the joint 8 is lapped by paving adhesive layer asphalt; wherein the compacted structure 6 has a degree of compaction of at least 98%. The porosity of the compacted structure 6 is no greater than 12%. Seam 8 is through laying the tie coat pitch overlap joint, and the seam 8 of road surface structure is inseparable, connects smoothly, must not produce obvious seam 8 segregation, between surface course 2 in pitch upper surface course 1 and the pitch, should all transversely misplace between surface course 2 and the pitch lower surface course 3 and lay in the pitch, and then form horizontal seam 8, and dislocation length is no less than 1 m. The seam 8 is in a step shape, the lap length of the seam 8 is not less than 3m, and the splicing seam 8 is subjected to hot asphalt filling sealing treatment to prevent water from entering. The road surface anti-crack material has excellent high and low temperature performance and external force deformation resistance, effectively slows down the generation of road surface cracks, reduces the road surface cost and prolongs the service life of the road surface.
The compacted structure 6 comprises an asphalt upper surface layer 1, an asphalt middle surface layer 2, an asphalt lower surface layer 3, a seal coat 4 and a road base layer from top to bottom; the new paving structure 7 comprises an asphalt upper surface layer 1, an asphalt middle surface layer 2, an asphalt lower surface layer 3, a seal coat 4 and a roadbed layer from top to bottom; and the asphalt upper surface layer 1 and the asphalt middle surface layer 2, and the asphalt middle surface layer 2 and the asphalt lower surface layer 3 are distributed with the viscous layer oil. The viscous layer oil is sprinkled through the asphalt sprinkling vehicle, the asphalt sprinkling vehicle keeps stable speed and sprinkling amount when sprinkling the viscous layer oil, and keeps the whole sprinkling width even, thereby guaranteeing the sprinkling effect of the first viscous layer and the second viscous layer, and further ensuring the construction quality of the asphalt pavement. The layer-bonding oil enables the adjacent two asphalt structure layers to be tightly connected, so that the asphalt upper surface layer 1 and the asphalt middle surface layer 2 are tightly connected, and the asphalt middle surface layer 2 and the asphalt lower surface layer 3 are tightly connected. And penetrating layer oil is distributed between the seal layer 4 and the road base layer. Wherein the asphalt upper surface layer 1 is SMA-13 type asphalt with the thickness of 4 cm; the asphalt middle surface layer 2 is AC-20 type asphalt with the thickness of 6 cm; the asphalt lower surface layer 3 is AC-25 type asphalt, and the thickness of the asphalt lower surface layer is 8 cm; the seal layer 4 is SBS modified asphalt; the roadbed comprises an emulsified asphalt cold regeneration base course 5.1, a cement stabilized macadam base course 5.2 and a cement stabilized macadam subbase course 5.3; the emulsified asphalt cold regeneration base layer 5.1 is an emulsified asphalt cold regeneration mixture, and the thickness of the emulsified asphalt cold regeneration base layer is 10 cm; the thickness of the cement-stabilized macadam foundation layer 5.2 is 36cm, and the thickness of the cement-stabilized macadam foundation layer 5.3 is 18 cm.
The emulsified asphalt cold-recycling mixture comprises the following components in parts by weight: milling and planing 10-20 mm asphalt: 41 parts of (1); milling and planing 5-10 mm asphalt: 19 parts of a mixture; milling and planing 0-5 mm asphalt: 27 parts of (1); 10-20 mm coarse aggregate: 10 parts of (A); mineral powder: 3 parts of a mixture; cement: 1.5 parts; emulsified asphalt: 3.8 parts; water: 3.3 parts. 5-10 mm limestone macadam is adopted as aggregate in the SBS modified asphalt, the dosage of asphalt is 1.0-1.2 kg per square meter, and the dosage of aggregate is 5kg per square meter; the coverage rate of SBS modified asphalt in the seal layer 4 is not less than 70%. 5.1 water content of the emulsified asphalt cold regeneration base layer is lower than 2%. The waste pavement materials are recycled, namely the asphalt milling material is used for preparing the emulsified asphalt cold-recycling mixture, each performance index of the mixture meets the road requirement, the project cost is saved, the stone exploitation is reduced, and the method has wide popularization and application prospects. A large amount of land and mineral resources are saved, the ecological environment is protected, and the green construction is promoted; the construction is simple, the progress is fast, the traffic is opened early, the influence on the traffic is small, and the method is particularly suitable for reconstruction and upgrade of old roads with heavy traffic.
The SMA-13 type asphalt is fine-grained asphalt concrete.
The raw material of the AC-20 type asphalt comprises the following components in parts by weight: 22-32 mm coarse aggregate: 5 parts of 16-22 mm coarse aggregate: 15 parts of coarse aggregate with the particle size of 11-16 mm: 22 parts of fine aggregate with the particle size of 6-11 mm: 18 parts of fine aggregate with the thickness of 3-6 mm: 11 parts of fine aggregate with the particle size of 0-3 mm: 25 parts of mineral powder: 4 parts of a mixture; asphalt: 4.4 parts. Wherein, the coarse aggregate and the fine aggregate are stones; the mixture was mixed by a batch mixer, and the mixing time per disc of the batch mixer was set to 65S (dry mixing 4S, wet mixing 47S, batch time 14S). The leaving temperature of the AC-20 type asphalt is 175-185 ℃. The mix should be discarded when it is above 195 ℃. The mixed material is preferably free of white stones, free of asphalt lumps, and black and bright.
The raw material of the AC-25 type asphalt comprises the following components in parts by weight: 20-30 mm coarse aggregate: 18 parts of 10-20 mm coarse aggregate, 21 parts of 5-10 mm coarse aggregate, 4 parts of 3-5 mm fine aggregate, 24 parts of 0-3 mm fine aggregate, 3 parts of mineral powder (internal reference lime powder) and 4.1 parts of asphalt. Wherein, the coarse aggregate and the fine aggregate are stones; the mixture was mixed using a batch mixer, and the mixing time was set to 45s per pan. And after the mixing is finished, the leaving temperature of the AC-25 type asphalt is 150-165 ℃, and the mixture is discarded when the temperature of the mixture is higher than 195 ℃. The mixed material is preferably free of white stones, free of asphalt lumps, and black and bright.
The technical principle of the utility model is that: the water content in the emulsified asphalt cold-recycling mixture is larger just after the construction, and more communicated gaps are formed in the emulsified asphalt cold-recycling mixture due to the existence of water. With the increase of the curing time, the water in the emulsified asphalt cold-recycling mixture is gradually dissipated, and the emulsified asphalt is gradually demulsified. When the emulsified asphalt cold-recycling base layer 5.1 is paved with the asphalt upper surface layer 1, the asphalt middle surface layer 2 and the asphalt lower surface layer 3, the emulsified asphalt cold-recycling base layer 5.1 is further compacted due to the heat conduction of the asphalt upper surface layer 1, the asphalt middle surface layer 2 and the asphalt lower surface layer 3 and the work transfer of the initial pressure, the secondary pressure and the final pressure of each asphalt surface layer, so that the density of the emulsified asphalt cold-recycling base layer is gradually increased, and the stability of the pavement structure is gradually enhanced.
The utility model accelerates the reaction to promote the dispersion of moisture in the cold regeneration layer through the temperature transfer of the emulsified asphalt cold regeneration base layer 5.1 with high temperature, thereby shortening the pavement health preserving time in the prior art to 3 days from 5 to 7 days; the utility model discloses do not additionally drop into other resources, for example main equipment etc. can accomplish the health preserving fast, open road traffic rapidly, but belong to the cyclic utilization of the green energy. The construction technology enables the construction process to be smoother, shortens the maintenance time, saves the construction period and the equipment service time, and improves the economic benefit.
Furthermore, the utility model also provides a quick health preserving method of cold regeneration road surface structure of emulsified asphalt, the step is as follows.
The method comprises the following steps: and (5) treating the diseases of the old asphalt pavement.
s 1: carrying out layered milling on the old asphalt pavement according to a construction drawing, collecting asphalt milling materials after milling is finished; the milling depth is as follows: the first layer is 8cm, the second layer is 10cm, 20cm wide steps are reserved on two sides of each layer during milling, and the milling width is 4.5m and 41m in sequence.
s 2: cleaning cracks, and cleaning the road surfaces within 16cm at two sides of the cracks; and drying the road surface.
s 3: and grouting cement slurry along the crack, and additionally arranging an anti-crack paste with the width of 32 cm.
Step two: and 5.1 constructing the emulsified asphalt cold regeneration base layer.
s 1: dividing the asphalt milling material of s1 in the first step into three types according to the particle size by using a screen, namely, the particle size of the first type of asphalt milling material is 10-20 mm, the particle size of the second type of asphalt milling material is 5-10 mm, and the particle size of the third type of asphalt milling material is 0-5 mm; the asphalt milling material is prepared by crushing and screening recovered old pavement materials. The construction time should be 1-2% more than the optimum water content, prevent the water loss in the course of transporting and paving, influence the construction quality, the asphalt milling and planing material related to of the utility model is the old road surface material reclaimed, make through breaking, sieving; the coarse aggregate is stone.
s 2: mixing and processing the following raw materials in parts by weight to form an emulsified asphalt cold-recycling mixture: milling and planing 10-20 mm asphalt: 41 parts of (1); milling and planing 5-10 mm asphalt: 19 parts of a mixture; milling and planing 0-5 mm asphalt: 27 parts of (1); 10-20 mm coarse aggregate: 10 parts of (A); mineral powder: 3 parts of a mixture; cement: 1.5 parts; emulsified asphalt: 3.8 parts; water: 3.3 parts.
s 3: paving an emulsified asphalt cold regeneration mixture to form an emulsified asphalt cold regeneration base layer 5.1, a cement stabilized macadam base layer 5.2 and a cement stabilized macadam base layer 5.3; spreading prime coat oil on a base course of the pavement to form a prime coat, and spreading SBS modified asphalt on the prime coat to form a seal coat 4; the spreading speed of the SBS modified asphalt is 2-3 m/min.
s 4: after paving is finished, measuring the paving thickness to be 13 cm; the loose paving coefficient is 1.3, the pavement is initially pressed, a double-steel-wheel road roller is used for rolling for 1 time, and the rolling speed is 1.5-3 km/h. The overlapping width of adjacent rolling belts in the double-steel-wheel road roller is 20-30 cm, the sprinkling device is used for discontinuously sprinkling water, the non-stick wheels are guaranteed, and the principle of tight following, slow pressing, high frequency and low amplitude is achieved during rolling so as to achieve the purpose of stabilizing the pressure and guaranteeing the flatness.
s 5: after the initial pressing is finished, re-pressing the road surface, and rolling for 2 times by using a single steel wheel road roller, wherein the compaction speed is 1.5-3 km/h; to reduce cracking, vibration during forward movement and static pressure during backward movement are used instead. The overlapping width of the adjacent rolling belts of the single-steel-wheel road roller is 1/2-1/3 wheels.
s 6: and (5) after the re-pressing is finished, performing final pressing on the road surface, and performing static pressure for 2 times by using a double-steel-wheel road roller, wherein the static pressure speed is 2-4 km/h. The thickness after compaction was 10 cm. And (5) dispatching a specially-assigned person to measure the flatness by using a 3m ruler, and if the flatness does not meet the requirement, continuously carrying out static pressure until the flatness meets the requirement.
During construction, the spiral feeder of the paver keeps automatic uniform rotation, and the height of the mixture is not less than 2/3 of the feeder so as to reduce the separation of the mixture, and the paver slowly, continuously and uniformly walks; the thickness and the cross slope of the paving layer should be checked at any time during the paving process.
Step three: paving an asphalt lower surface layer 3; the lower asphalt layer 3 is made of AC-25 type asphalt, the paving thickness of the lower asphalt layer 3 is 10cm, the loose paving coefficient is 1.25, and the thickness after compaction is 8 cm; spreading an AC-25 type asphalt mixture with the temperature of 150-165 ℃ above the seal coat 4; before paving the mixture, firstly, the wire of a screed plate of the paver is adjusted, a certain camber is reserved during the adjustment of the screed plate to offset upwarping of the screed plate after being heated, the paver is erected by filling square timbers or wood plates on two sides of the bottom surface of the screed plate to determine the initial loose paving thickness, and the screed plate is preheated for 0.5-1 h before paving, wherein the temperature is required to be not lower than 100 ℃. The temperature of the mixture of the AC-25 asphalt lower surface layer 3 is not lower than 145 ℃ before paving, and the speed of a paver is controlled to be 2-3 m/min during paving. During construction, the spiral feeder of the paver keeps automatic uniform rotation, and the height of the mixture is not less than 2/3 of the feeder so as to reduce the separation of the mixture, and the paver slowly, continuously and uniformly travels. And (4) inspecting the thickness and the cross slope of the paving layer at any time in the paving process.
Firstly, carrying out static pressure 1 time by using a double-steel-wheel road roller, and then rolling 3 times by using a double-steel-wheel vibratory road roller to finish primary pressing, wherein the primary pressing temperature is not lower than 140 ℃; the 1 st forward static pressure and backward vibration. The 2 nd to 3 rd times of forward and backward movement are all vibration, the compaction speed is controlled to be 1.5-2 km/h, a road roller is compacted by high-frequency high-amplitude compaction, and the track overlapping of adjacent rolling wheels is about 20-30 cm. The sprinkling device sprinkles water discontinuously as long as the non-stick wheel is ensured. When the vibration pressure of the double-steel-wheel vibratory roller is real, the front wheel and the rear wheel are kept to be started to vibrate. The method is characterized in that sundries on all tires are removed, a release agent is coated, water is not sprayed when the release agent is coated, and the rubber-tyred roller can enter the next re-pressing section after the temperature of the tires is increased as much as possible on the first re-pressing section.
The re-pressing is carried out for not less than 4 times by using a rubber-tyred roller, and the re-pressing temperature is not lower than 110 ℃; in the re-pressing process, if the temperature of the rubber wheel is raised and the wheel sticking phenomenon is not obvious, the frequency of smearing the separant can be reduced.
Carrying out final pressing after the re-pressing is finished, and carrying out static pressing for 2 times by using a double-steel-wheel road roller; controlling the speed to be 3-4 km/h; after static pressure is carried out for 2 times, a specially-assigned person is sent to measure the flatness by using a 3m ruler, and if the flatness does not meet the requirement, the static pressure is continuously carried out until the flatness meets the requirement. The temperature of the pavement is not lower than 80 ℃ after the final pressure is finished; the seam 8 between the compacted structure 6 and the newly laid structure 7 is treated.
And (3) closing traffic in time after the construction is finished, and opening the traffic after the asphalt lower surface layer 3 is completely and naturally cooled and the surface temperature of the mixture is lower than 50 ℃.
Step four: and the temperature of the road surface is lower than 50 ℃, and coring detection is carried out by using a drilling core-taking machine. The average porosity value of the emulsified asphalt cold regeneration base layer 5.1 is 10.8 percent and is lower than 12 percent; and the average value of the compactness is more than or equal to 98.4 percent; the compaction degree of the AC-25 asphalt lower surface layer 3 is more than or equal to 98 percent on average with the compaction degree of 98.8 percent. The coring detection is qualified.
Step five: and (5) detecting to be qualified, and spraying the viscous layer oil by using an asphalt spraying vehicle.
Step six: paving an asphalt middle surface layer 2; the loose coefficient of a surface layer 2 in the AC-20 type asphalt is 1.21, and the thickness after compaction is 6 cm; before paving the mixture, firstly, the wire of a screed plate of the paver is adjusted, a certain camber is reserved during the adjustment of the screed plate to offset upwarping of the screed plate after being heated, square wood or wood plate is padded on two sides of the bottom surface of the screed plate to erect the paver, the initial loose paving thickness is determined, the screed plate is preheated 0.5-1 hour before paving, and the temperature is required to be not lower than 140 ℃.
Spreading the AC-20 asphalt mixture with the temperature of 175-185 ℃ above the second adhesive layer; the speed of the spreading machine is controlled to be 2-3 m/min. During construction, the spiral feeder of the paver keeps automatic uniform rotation, and the height of the mixture is not less than 2/3 of the feeder so as to reduce the separation of the mixture, and the paver slowly, continuously and uniformly travels. And (4) inspecting the thickness and the cross slope of the paving layer at any time in the paving process.
Firstly, rolling for 1 time by using a paver, then rolling for 1 time by using a double-steel-wheel road roller, controlling the compaction speed to be 3-4 km/h, controlling the overlapping width of adjacent rolling belts to be 20-30 cm, intermittently sprinkling water by a sprinkling device to ensure that the wheels are not stuck, and realizing the principles of tight following, slow pressing, high frequency and low amplitude during rolling so as to achieve the purposes of stabilizing the pressure and ensuring the flatness, wherein the primary pressing temperature is not lower than 160 ℃, and finishing the primary pressing; rolling for 4 times by using a rubber-tyred roller, wherein the rolling speed is 2.5-3.5 km/h, and the overlapping width of adjacent rolling belts is 20-30 cm; the re-pressing temperature is not lower than 140 ℃; carrying out static pressure for 2 times at the speed of 3-4 km/h by using a double-steel-wheel road roller at final pressure, wherein the pavement temperature is not lower than 110 ℃ after the final pressure is finished; then a specially assigned person is dispatched to measure the flatness by using a three-meter ruler, and if the flatness does not meet the requirement, static pressure is continuously carried out until the flatness meets the requirement; the seam 8 between the compacted structure 6 and the newly laid structure 7 is treated.
Step seven: and spreading the viscous layer oil by using an asphalt spreading vehicle.
Step eight: paving an asphalt upper surface layer 1; paving the SMA-13 asphalt mixture above the second adhesive layer; the seam 8 between the compacted structure 6 and the newly laid structure 7 is treated.
Further, in the second step and the third step, when the rolling of the emulsified asphalt cold-recycling mixture is finished, the emulsified asphalt cold-recycling base layer 5.1 does not form the final strength; and paving the asphalt lower surface layer 3 after the emulsified asphalt cold regeneration base layer has the strength of 5.1 qualified after 0.5-1 h.
The utility model discloses a surface course 2 and the compaction transmission that the pitch was under surface course 1, the pitch of going up 3 rolls the construction of surface course for the porosity of road surface compares prior art's porosity 3% ~ 6% and falls to 2 ~ 3%, makes the density increase on road surface, to the rainy season, the construction application of strong wind weather emulsified asphalt cold regeneration mixture has played good propulsive effect. The mechanical property and the durability are obviously enhanced. Through the thermal energy conduction of the high-temperature emulsified asphalt cold regeneration base layer 5.1 and the compaction and compaction of the road roller, the lower-layer emulsified asphalt cold regeneration pavement is effectively promoted to accelerate the demulsification time and improve the hardening strength, and the durability of the cold regeneration pavement structure layer is favorably improved.
The above description is only for the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any changes or substitutions that can be considered by those skilled in the art within the technical scope of the present invention should be covered by the protection scope of the present invention.
Claims (7)
1. The utility model provides a cold regeneration road surface structure of emulsified asphalt which characterized in that: the asphalt pavement structure comprises a compacted structure (6) and a newly paved structure (7), wherein a joint (8) is arranged between the compacted structure (6) and the newly paved structure (7), and the joint (8) is overlapped by paving adhesive layer asphalt; the compacted structure (6) comprises an asphalt upper surface layer (1), an asphalt middle surface layer (2), an asphalt lower surface layer (3), a seal coat (4) and a road base layer from top to bottom; the new paving structure (7) comprises an asphalt upper surface layer (1), an asphalt middle surface layer (2), an asphalt lower surface layer (3), a seal coat (4) and a road base layer from top to bottom; wherein the asphalt upper surface layer (1) is SMA-13 type asphalt with the thickness of 4 cm; the asphalt middle surface layer (2) is AC-20 type asphalt with the thickness of 6 cm; the asphalt lower surface layer (3) is AC-25 type asphalt, and the thickness of the asphalt lower surface layer is 8 cm; the seal layer (4) is SBS modified asphalt; the roadbed comprises an emulsified asphalt cold regeneration base course (5.1), a cement stabilized macadam base course (5.2) and a cement stabilized macadam subbase course (5.3); the emulsified asphalt cold regeneration base layer (5.1) is an emulsified asphalt cold regeneration mixture, and the thickness of the emulsified asphalt cold regeneration base layer is 10 cm; the thickness of the cement-stabilized macadam foundation layer (5.2) is 36cm, and the thickness of the cement-stabilized macadam foundation layer (5.3) is 18 cm.
2. The cold-recycling pavement structure of emulsified asphalt as claimed in claim 1, wherein said upper asphalt layer (1) and middle asphalt layer (2), and between said middle asphalt layer (2) and lower asphalt layer (3), are sprayed with binder oil.
3. The cold-recycling pavement structure of claim 1, characterized in that a permeable layer oil is distributed between the seal layer (4) and the roadbed layer.
4. An emulsified asphalt cold-recycling pavement structure as claimed in claim 1, wherein said joint (8) is stepped.
5. An emulsified asphalt cold-recycled pavement structure as set forth in claim 1, wherein said joints (8) are overlapped by not less than 3 m.
6. An emulsified asphalt cold-recycled pavement structure as claimed in claim 1, wherein the degree of compaction of said compacted structure (6) is at least 98%.
7. An emulsified asphalt cold-recycled pavement structure as claimed in claim 1, wherein the porosity of said compacted structure (6) is not more than 12%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022330318.XU CN213625024U (en) | 2020-10-19 | 2020-10-19 | Cold regeneration road surface structure of emulsified asphalt |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022330318.XU CN213625024U (en) | 2020-10-19 | 2020-10-19 | Cold regeneration road surface structure of emulsified asphalt |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213625024U true CN213625024U (en) | 2021-07-06 |
Family
ID=76662117
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022330318.XU Active CN213625024U (en) | 2020-10-19 | 2020-10-19 | Cold regeneration road surface structure of emulsified asphalt |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213625024U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113584984A (en) * | 2021-07-29 | 2021-11-02 | 中交路桥建设有限公司 | Construction method for joint of hot-mix asphalt mixture and emulsified asphalt cold-recycling surface course |
| CN115418907A (en) * | 2022-08-24 | 2022-12-02 | 连云港科创工程质量检测有限公司 | Heat self-healing asphalt pavement structure and heat self-healing method thereof |
-
2020
- 2020-10-19 CN CN202022330318.XU patent/CN213625024U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113584984A (en) * | 2021-07-29 | 2021-11-02 | 中交路桥建设有限公司 | Construction method for joint of hot-mix asphalt mixture and emulsified asphalt cold-recycling surface course |
| CN115418907A (en) * | 2022-08-24 | 2022-12-02 | 连云港科创工程质量检测有限公司 | Heat self-healing asphalt pavement structure and heat self-healing method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN206736657U (en) | A kind of cracking resistance rubber asphalt composite seal coat | |
| CN213625024U (en) | Cold regeneration road surface structure of emulsified asphalt | |
| CN103882788B (en) | Based on the method for constructing roadway of the modification roller compacted concrete surface layer of enzyme soil cured substrate layer | |
| CN112301826B (en) | Emulsified asphalt cold-recycling pavement structure and rapid curing method for pavement | |
| CN106587835A (en) | Cold-mixed cement-emulsified asphalt concrete and pavement method thereof | |
| CN110258236A (en) | A kind of high-performance steel slag road surface and its construction method | |
| CN111455770B (en) | Asphalt pavement splicing structure based on recycled materials and construction method thereof | |
| CN107386028A (en) | Road three-hybrid system cold in place recycling engineering method | |
| CN112211198A (en) | Municipal road engineering pavement construction technology | |
| CN113089407A (en) | Asphalt pavement structure and construction method thereof | |
| CN103924495A (en) | Small and medium-sized steel bridge deck pavement system and implementation method | |
| CN107419635A (en) | A kind of composite pavement sealing method | |
| CN114163187A (en) | Emulsified asphalt plant-mixed cold-recycling mixture and construction process thereof | |
| CN108570897A (en) | A kind of paving method of pavement of road base | |
| CN104631266B (en) | Normal-temperature asphalt pavement cold-mixed and cold-paved construction technology | |
| CN113389107A (en) | Milling, mixing, paving and compacting method for synchronous paving and in-situ cold recycling | |
| CN205329451U (en) | Foamed asphalt cold in -place recycling mixture pavement | |
| CN113668316B (en) | Construction method of asphalt highway | |
| CN111719371A (en) | Road base layer component and road paving method | |
| CN110205895A (en) | A kind of green low-carbon environment-friendly type road structure using regrown material | |
| CN206784100U (en) | A kind of bituminous paving interlayer structure | |
| CN205576675U (en) | Road surface based on double -deck cold regeneration zone | |
| CN113756148A (en) | Construction method of pouring type composite pavement | |
| CN114016430A (en) | Asphalt concrete bridge deck pavement method | |
| CN209636583U (en) | A kind of pitch composite seal coat for road in airport |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |