CN114351529A - Pavement structure adopting warm-mix ultrathin layer overlay and construction method thereof - Google Patents

Pavement structure adopting warm-mix ultrathin layer overlay and construction method thereof Download PDF

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CN114351529A
CN114351529A CN202110443831.6A CN202110443831A CN114351529A CN 114351529 A CN114351529 A CN 114351529A CN 202110443831 A CN202110443831 A CN 202110443831A CN 114351529 A CN114351529 A CN 114351529A
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ultrathin
layer
parts
asphalt
mixture
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程虎
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Sichuan Jinglu Road Material Technology Co ltd
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Sichuan Jinglu Road Material Technology Co ltd
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Abstract

The invention discloses a pavement structure adopting a warm-mixed ultrathin layer overlay and a construction method thereof, belongs to the technical field of pavement structures and construction, and solves the problems of environmental pollution and high energy consumption caused by an ultrathin wearing layer of hot-mixed asphalt in the prior art. The invention comprises an original pavement, a bonding waterproof layer and an ultrathin finish coat, wherein the original pavement is subjected to disease treatment, the bonding waterproof layer is laid on the surface of the original pavement, the ultrathin finish coat is laid on the surface of the bonding waterproof layer, the ultrathin finish coat is a warm-mix ultrathin finish coat finished product mixture OGFC-5, and the oilstone ratio of the ultrathin finish coat is 6.5-7.0%. The invention can save fuel oil for manufacturing and producing by 20-30%, reduce the emission of greenhouse gas by about 50%, and reduce the emission of harmful gas such as asphalt smoke by more than 80%; does not produce milling asphalt waste, protects the environment and better accords with the national green environmental protection policy. The method is suitable for repairing and pre-maintaining the white-to-black cement road surface, the asphalt road surface and the color green road construction.

Description

Pavement structure adopting warm-mix ultrathin layer overlay and construction method thereof
Technical Field
The invention belongs to the technical field of pavement structures and construction, and particularly relates to a pavement structure adopting a warm-mix ultrathin layer overlay and a construction method thereof.
Background
In recent years, due to the rapid increase of overload vehicles, heavy-duty vehicles and traffic flow, although most of roads built in early stage have complete pavement structure, the performances of pavement skid resistance, flatness, comfort and the like are greatly reduced, and some roads even cannot meet the use requirements, so that great potential safety hazards exist. For this reason, it is common practice to apply an asphalt concrete overlay to restore the surface function.
The hot-mix asphalt ultrathin wearing layer technology is applied to France for the first time in 1988, is mainly used for maintaining a surface layer of a newly paved road and an old road, and is also researched by other countries such as British, Poland, Sweden after France, the technology is applied to Europe for more than 20 years, is introduced to the United states in 1992, and has been applied to an application area of more than 1000 ten thousand meters per year until 20132. Most of the projects are high-grade highways with ultra-large traffic loads, and the excellent road performance and the outstanding economical efficiency of the highways are fully expressed. The hot-mixed ultrathin wearing layer is introduced into China in 2003 by virtue of excellent safety, environmental protection and comfort performance and outstanding economical efficiency, and is mainly used for preventive maintenance of expressways and corrective treatment of slight diseases. The method is applied to large area of China from 2006, and the annual application amount is 500-700 ten thousand meters till now280% of the film is ultrathin with the thickness of 2cm, and 20% of the film is ultrathin with the thickness of 2.5 cm. The ultrathin wearing layer has the characteristics of thin thickness, small particle size, large structural depth, good anti-sliding performance, small driving vibration, low noise, firm adhesion with a lower bearing layer and the like compared with ultrathin layer covers such as slurry seal layers, micro-surfacing and the like.
However, the ultra-thin wearing layer of the hot-mix asphalt has the problems of environmental pollution and high energy consumption, and can not meet the requirement of green development in new period of China.
Disclosure of Invention
Aiming at the problems of environmental pollution and high energy consumption caused by adopting a hot-mixed asphalt ultrathin wearing layer in the prior art, the invention provides a pavement structure adopting a warm-mixed ultrathin layer cover and a construction method thereof, and aims to provide a pavement structure adopting a warm-mixed ultrathin layer cover and a construction method thereof, wherein the pavement structure comprises the following steps: and the energy consumption is reduced and the environment is protected while the pavement is repaired.
The technical scheme adopted by the invention is as follows:
the utility model provides an adopt road surface structure of warm mix ultrathin layer top facing, includes former road surface, bonding waterproof layer, ultra-thin top facing, former road surface is handled through the disease, the surface on former road surface is laid to the bonding waterproof layer, ultra-thin top facing is laid in the surface of bonding waterproof layer, ultra-thin top facing is warm mix ultrathin top facing finished product mixture OGFC ~ 5, ultra-thin top facing is the extremely thin wearing layer of 1 ~ 1.5cm thick, and the oilstone ratio is 6.5% ~ 7.0%.
By adopting the technical scheme, the warm-mixed ultrathin layer cover reduces the construction and paving temperature, and can be paved when the ground temperature is higher than minus 2 ℃; the mixture is discharged at the temperature of 130-; the health of workers is protected, the environment is protected, and the national green environmental protection policy is met. Compared with the traditional AC thick layer repairing and laying process, the original 'aged asphalt surface layer' does not need to be milled, so that milled asphalt waste is not generated, the environment is protected, and the process is more in line with the national environmental protection policy in the waste link. The construction process is simple, the pavement can be paved after the viscous layer oil is uniformly spread on the original pavement, the traffic is opened quickly, and the traffic can be opened after half an hour of paving and rolling. And the paving thickness of the ultrathin cover coat does not influence the height control of the curb and the inspection well cover, the curb and the inspection well cover do not need to be adjusted and lifted, the construction difficulty is reduced, and the comprehensive cost of maintenance, upgrading and upgrading is also reduced.
Preferably, the bonding waterproof layer is pure oily bonding layer oil, and the spraying amount is 0.5-0.7 kg/m2
After the preferred scheme is adopted, the bonding waterproof layer plays a role in combining new and old pavements and simultaneously isolates the influence of water on the reticular fine cracks, so that a waterproof layer is integrally formed, and the influence of water seepage on the bottom pavement and the roadbed is effectively prevented.
Preferably, the bonding waterproof layer comprises 10-15 parts of SBS modified asphalt, 10-15 parts of SBR modified asphalt, 20-35 parts of rock asphalt, 3-4 parts of coumarone resin, 3-5 parts of emulsifier, 15-25 parts of water and 5-12 parts of high-strength quick-drying EVA emulsion glue.
After the optimal scheme is adopted, the bonding waterproof layer can quickly form a bonding layer on the original pavement to permeate into the original asphalt or cement layer, the demulsification and the solidification are rapidly carried out, the bonding influence on paving equipment is avoided, and when the warm-mixed ultrathin covering layer mixture at the temperature of 80-130 ℃ is paved on the pavement, the temperature of the warm-mixed ultrathin covering layer material rapidly enables the bonding waterproof layer to be dissolved and bonded with the ultrathin mask surface layer, so that the effects of vertical bonding and water resistance are achieved.
Preferably, the ultrathin cover coat comprises coarse aggregates and fine aggregates, the coarse aggregates are basalt with the particle size of 3-5 mm or other mineral aggregates with the hardness equivalent to that of the basalt, and the fine aggregates are machine-made sand with the particle size of 0-3 mm; the grain size is in discontinuous gradation at 2.36-4.75 mm, and the grain size is in open gradation below 2.36 mm.
After adopting this preferred scheme, ultra-thin finish coat's water permeability is good, can effectively prevent surface gathered water, can effectively restrain to form water smoke and surface gathered water slippery.
Preferably, the ultrathin finishing coat also comprises mineral powder, warm-mixed ultrathin finishing coat mother liquor asphalt and polyester fiber, wherein the mass of each component accounts for 70-75% of coarse aggregate, 15-20% of fine aggregate, 3-5% of mineral powder and 2% of polyester fiber in the ultrathin finishing coat, and the use amount of the warm-mixed ultrathin finishing coat mother liquor asphalt is 6.5-7.0% of the total mass ratio of the coarse aggregate, the fine aggregate, the mineral powder and the polyurethane fiber.
Preferably, the warm-mixed ultrathin overlay mother liquor asphalt comprises 40-45 parts of SBS modified asphalt, 35-40 parts of SBR modified asphalt, 5-7 parts of rock asphalt, 1-2 parts of warm mixing agent, 2-3 parts of thermoplastic elastomer, 3-4 parts of coumarone resin, 0.5-0.8 part of stabilizer, 1-1.5 parts of anti-aging agent and 2-3.2 parts of dispersing agent.
After the optimal scheme is adopted, the environment-friendly warm-mixing ultrathin overlay mother liquor asphalt is environment-friendly and low in cost, and can achieve the purposes of protecting the pavement structure and prolonging the service life of the pavement; the pavement can be exposed to strong ultraviolet rays of sunlight for a long time, can be used in heavy rain weather, and has wide application range and long service life.
A construction method of a pavement structure adopting a warm-mix ultrathin layer overlay comprises the following steps:
the method comprises the following steps: preparation before construction: the method comprises the steps of raw material preparation and mechanical preparation;
step two: treating the diseases of the original pavement: surveying and disposing the original pavement diseases, performing crack pouring or mending treatment on longitudinal cracks, transverse cracks and reticular cracks of old cement and asphalt pavements, and performing quick digging, filling changing and re-laying treatment on positions with the original pavement track being larger than 1cm or having problems of loosening, sinking, upwrapping, cracking, slurry turning and the like in advance;
step three: cleaning the road surface: removing sundries on the road surface and ensuring that the road surface is in a dry state during construction;
step four: spraying adhesive layer oil: the spraying amount of the coating oil is 0.5-0.7 kg/m2
Step five: production of ultrathin layer cover mixture: determining the proportion of aggregate, filler and modified asphalt of the mixture according to the design thickness of the ultrathin layer cover, wherein the heating temperature of the ultrathin cover mother solution asphalt is 115-125 ℃, the temperature of the mineral aggregate is 140-150 ℃, and the leaving temperature of the mixture is 130-140 ℃;
step six: and (3) transporting the mixture: the dumper with the heat-insulating layer is used for transporting the mixture, the top of a carriage is covered by tarpaulin, and the arrival temperature of the mixture is not lower than 115 ℃;
step seven: spreading an ultrathin layer cover surface mixture: preheating a screed plate to 100 ℃ before paving, wherein the paving temperature of the ultrathin layer overlay mixture is 110-115 ℃, and discarding the mixture if the temperature of the mixture is lower than 90 ℃;
step eight: rolling and forming: primarily pressing for two times by adopting 8-ton or 12-ton double steel wheels in a static pressure mode, then re-pressing and smoothing, controlling the rolling speed at 8km/h, and finishing rolling before the temperature of the mixture is reduced to 80 ℃;
step nine: checking and accepting to detect: detecting according to the national acceptance standard of the asphalt concrete pavement;
step ten, opening traffic: and opening the traffic after the pavement is cooled to below 40 ℃, and opening the traffic after 20-30 min under the condition that the environmental temperature is lower than 10 ℃.
After the technical scheme is adopted, construction is convenient and fast, the period is short, milling and planing processing is not needed to be carried out on the road surface before construction, only conventional maintenance such as crack pouring, pit filling and the like is needed to be carried out in advance, and the maintenance construction period of the road can be greatly shortened.
Preferably, the spraying of the viscous layer oil in the fourth step is carried out 30-90 min before the spreading of the mixture.
Preferably, the lowest temperature for spreading the ultra-thin layer overlay compound in step seven is-2 ℃.
Preferably, the rated mixture in the ultrathin finishing layer is added with color powder during the mixing process.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
1. the warm-mixed ultrathin layer cover reduces the construction and paving temperature, and can be paved when the ground temperature is higher than-2 ℃; the mixture is discharged at the temperature of 130-; the health of workers is protected, the environment is protected, and the national green environmental protection policy is met. Compared with the traditional AC thick layer repairing and laying process, the original 'aged asphalt surface layer' does not need to be milled, so that milled asphalt waste is not generated, the environment is protected, and the process is more in line with the national environmental protection policy in the waste link. The construction process is simple, after the adhesive layer oil is uniformly spread on the original road surface, the pavement can be quickly opened, and the traffic can be opened after half an hour of paving and rolling.
2. The paving thickness of the ultrathin cover coat does not influence the height control of the curb and the inspection well cover, the curb and the inspection well cover do not need to be adjusted and lifted, the construction difficulty is reduced, and the comprehensive cost of maintenance, gear lifting and upgrading is also reduced.
3. The warm-mixed ultrathin overlay mother liquor asphalt (also called warm-mixed decolored asphalt mother liquor) is added with color powder and can be used for paving color pavements.
4. The bonding waterproof layer can quickly form a bonding layer on the original pavement to permeate into the original asphalt or cement layer, and the bonding waterproof layer is rapidly demulsified and cured without generating bonding influence on paving equipment, when the warm-mixed ultrathin finish coat mixture at the temperature of 80-130 ℃ is paved on the pavement, the temperature of the warm-mixed ultrathin cover coat material rapidly enables the bonding waterproof layer to be dissolved and bonded with the ultrathin cover coat layer, so that the effects of up-and-down bonding and water resistance are achieved, and the influence of water seepage on the bottom pavement and the roadbed is effectively prevented.
5. By adopting the OGFC-5 grading structure, the water accumulation on the road surface can be effectively prevented, the flatness of the road surface can be improved, and the road surface has the characteristics of skid resistance, noise reduction and water mist prevention.
6. The polyester fiber (toughening agent) is added in the ultrathin covering layer, so that the high-temperature stability and the low-temperature crack resistance of the ultrathin covering layer can be further improved.
7. The construction can be carried out at the temperature of more than 2 ℃ below zero, and the influence of the construction environment temperature on the application range is greatly reduced.
8. Because the asphalt smoke emission is less, the construction of the tunnel pavement warm-mixing ultrathin asphalt technology is beneficial to the health of workers, and meanwhile, the air slope of the material can reduce an ash layer and reduce the defect of insufficient brake coefficient caused by the fact that an automobile tail gas oil film adheres to the pavement. The inner layer of the bridge can reduce the whole load of the bridge by using an ultrathin layer technology, and the service cycle of the bridge is prolonged.
Drawings
The invention will now be described, by way of example, with reference to the accompanying drawings, in which:
fig. 1 is a schematic structural view of the present invention.
Wherein, 1-original pavement, 2-bonding waterproof layer and 3-ultrathin finishing coat.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all the embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present application without making any creative effort, shall fall within the protection scope of the present application.
The present invention will be described in detail with reference to fig. 1.
Example one
The utility model provides an adopt road surface structure of ultra-thin finish coat of warm mix, includes former road surface 1, bonding waterproof layer 2, ultra-thin finish coat 3, former road surface 1 is handled through the disease, bonding waterproof layer 2 lays in the surface of former road surface 1, ultra-thin finish coat 3 lays in the surface of bonding waterproof layer 2, ultra-thin finish coat 3 is warm mix ultra-thin finish coat finished product mixture OGFC ~ 5. In this example, the ultra-thin overcoat 3 is a very thin wearing layer 1cm thick with an oilstone ratio of 6.5%.
In this embodiment, the spraying amount of the bonding waterproof layer 2 is 0.5kg/m2
In this embodiment, the bonding waterproof layer 2 includes 10 parts of SBS modified asphalt, 10 parts of SBR modified asphalt, 20 parts of rock asphalt, 3 parts of coumarone resin, 3 parts of emulsifier, 15 parts of water, and 5 parts of high-strength quick-drying EVA emulsion glue.
Because of the ultrathin characteristic and the half-open gradation characteristic of the micro-mat surface, the bonding waterproof layer is required to have better bonding characteristic and water-resistant characteristic, and the construction performance of mechanical spraying is required to be met. The special adhesive layer material for the micro-surfacing must meet the requirements of the following table.
TABLE 1 Performance index the micro-surfacing adhesive material needs to meet
Index (I) Test method Unit of Require that
Viscosity, 25 deg.C T 0625–2011 mPa·s 50–150
Storage stability test, 24h T 0656–1993 ≤0.5
Screen residual test, 0.3mm,25 deg.C T 0652–1993 ≤0.1
Adhesive strength CJJ139–2010 MPa ≥0.6
In the embodiment, the ultrathin overlay 3 comprises coarse aggregates and fine aggregates, the coarse aggregates are basalt with the particle size of 3-5 mm or other mineral aggregates with the hardness equivalent to that of the basalt, and the fine aggregates are machine-made sand with the particle size of 0-3 mm; the grain size is in discontinuous gradation at 2.36-4.75 mm, and the grain size is in open gradation below 2.36 mm.
In this embodiment, the ultrathin overlay 3 further includes mineral powder, warm-mixed ultrathin overlay mother liquor asphalt and polyester fiber, and the mass of each component in the ultrathin overlay 3 accounts for 70% of coarse aggregate, 18.7% of fine aggregate, 5% of mineral powder, 2% of polyester fiber, and the balance warm-mixed ultrathin overlay mother liquor asphalt, and the oilstone ratio is 6.5%.
In this embodiment, the warm-mix ultrathin overlay mother liquor asphalt comprises 40 parts of SBS modified asphalt, 35 parts of SBR modified asphalt, 5 parts of rock asphalt, 1 part of warm-mix agent, 2 parts of thermoplastic elastomer, 3 parts of coumarone resin, 0.5 part of stabilizer, 1 part of anti-aging agent, and 2 parts of dispersant.
Example two
The utility model provides an adopt road surface structure of warm mix ultrathin layer top facing, includes former road surface 1, bonding waterproof layer 2, ultrathin top facing 3, former road surface 1 is handled through the disease, bonding waterproof layer 2 lays in the surface of former road surface 1, ultrathin top facing 3 lays in the surface of bonding waterproof layer 2, ultrathin top facing 3 is warm mix ultrathin top facing finished product mixture OGFC ~ 5, ultrathin top facing 3 is the extremely thin wearing layer that 1.5cm is thick, and the oilstone ratio is 7.0%.
The bonding waterproof layer 2 is pure oily bonding layer oil, and the spraying amount is 0.7kg/m2
In this embodiment, the bonding waterproof layer 2 includes 15 parts of SBS modified asphalt, 15 parts of SBR modified asphalt, 35 parts of rock asphalt, 4 parts of coumarone resin, 5 parts of emulsifier, 25 parts of water, and 12 parts of high-strength quick-drying EVA emulsion glue.
The ultrathin cover coat layer 3 comprises coarse aggregates and fine aggregates, the coarse aggregates are basalt with the grain size of 3-5 mm or other mineral aggregates with the hardness equivalent to that of the basalt, and the fine aggregates are machine-made sand with the grain size of 0-3 mm; the particle size of the mixture is in discontinuous gradation at the position of 2.36-4.75 mm, and the particle size of the mixture is in open gradation below 2.36 mm.
The ultrathin overlay 3 also comprises mineral powder, warm-mixed ultrathin overlay mother liquor asphalt and polyester fiber, wherein the mass of each component accounts for 73.25% of coarse aggregate, 15% of fine aggregate, 5% of mineral powder and 2% of polyester fiber in the ultrathin overlay 3, and the balance is warm-mixed ultrathin overlay mother liquor asphalt, and the oilstone ratio is 7.0%.
The warm-mixed ultrathin overlay mother liquor asphalt comprises 45 parts of SBS modified asphalt, 40 parts of SBR modified asphalt, 7 parts of rock asphalt, 2 parts of warm-mixing agent, 3 parts of thermoplastic elastomer, 4 parts of coumarone resin, 0.8 part of stabilizer, 1.5 parts of anti-aging agent and 3.2 parts of dispersing agent.
EXAMPLE III
The utility model provides an adopt road surface structure of ultra-thin finish coat is mixed to temperature, includes former road surface 1, bonding waterproof layer 2, ultra-thin finish coat 3, former road surface 1 is handled through the disease, bonding waterproof layer 2 lays in the surface of former road surface 1, ultra-thin finish coat 3 lays in the surface of bonding waterproof layer 2, ultra-thin finish coat 4 is mixed ultra-thin finish coat finished product mixture OGFC ~ 5 for the temperature, and ultra-thin finish coat 3's oilstone ratio is 6.8 in this embodiment. The density of the finished OGFC-5 graded mixture prepared by stir-frying the warm-mixed ultrathin layer overlay mother liquor asphalt in a mixing station is 2.35 tons/cubic meter to 2.4 tons/cubic meter.
In this example, the ultra-thin overcoat 3 is a very thin wearing layer 1.3cm thick.
In this embodiment, the bonding waterproof layer 2 is pure oily adhesive layer oil, and the spraying amount is 0.6kg/m2. The bonding waterproof layer 2 comprises 125 parts of SBS modified asphalt, 13 parts of SBR modified asphalt, 28 parts of rock asphalt, 3.5 parts of coumarone resin, 4 parts of emulsifier, 20 parts of water and 9 parts of high-strength quick-drying EVA emulsion glue.
In the embodiment, the ultrathin overlay 3 comprises coarse aggregates and fine aggregates, wherein the coarse aggregates are mineral aggregates with the particle size of 3-5 mm and the hardness equivalent to that of basalt, and the fine aggregates are machine-made sand with the particle size of 0-3 mm; the particle size of the mixture is in discontinuous gradation at the position of 2.36-4.75 mm, and the particle size of the mixture is in open gradation below 2.36 mm.
In this embodiment, a polyester fiber (toughening agent) is added to the ultrathin top coat 3, and the addition amount of the polyester fiber (toughening agent) is 2% of the weight of the ultrathin top coat 3.
In this embodiment, the ultrathin overlay 3 further includes mineral powder and warm-mixed ultrathin overlay mother liquor asphalt, and the mass of each component in the ultrathin overlay 3 accounts for 72% of coarse aggregate, 16.43% of fine aggregate, 5% of mineral powder and 2% of polyester fiber (toughening agent). The rest is warm-mixed ultrathin overlay mother liquor asphalt, and the oilstone ratio is 6.8 percent.
The warm-mixed ultrathin overlay mother liquor asphalt comprises 43 parts of SBS modified asphalt, 38 parts of SBR modified asphalt, 6 parts of rock asphalt, 1.5 parts of warm-mixing agent, 2.5 parts of thermoplastic elastomer, 3.5 parts of coumarone resin, 0.6 part of stabilizer, 1.5 parts of anti-aging agent and 2.5 parts of dispersing agent.
The invention also provides a construction method of the pavement structure adopting the warm-mix ultrathin layer overlay, which comprises the following steps:
the method comprises the following steps: preparation before construction: the method comprises the steps of raw material preparation and mechanical preparation;
step two: treating the old pavement diseases: the method comprises the following steps of surveying and disposing diseases such as cracks, pot holes, tracks, bridge head and culvert top jumping, surface damage and the like on an original pavement in advance, carrying out crack pouring or patching treatment on longitudinal joints, transverse joints and reticular cracks of cement and asphalt old pavements according to the properties of the cracks and the width of the cracks, and carrying out quick digging, filling changing and re-paving treatment on positions with the tracks of the old pavements larger than 1cm or with the problems of loosening, sinking, upwrapping, cracking, slurry turning and the like in advance;
step three: cleaning the road surface: removing sundries on the road surface and ensuring that the road surface is in a dry state during construction;
step four: spraying adhesive layer oil: spraying the adhesive layer oil on the whole road surface by using a high-pressure airless sprayer, wherein the spraying amount is 0.5-0.7 kg/m2(ii) a Spraying the viscous layer oil 30-90 min before the mixture is spread;
step five: production of ultrathin layer cover mixture: determining the proportion of aggregate, filler and modified asphalt of the mixture according to the design thickness of the ultrathin layer cover, wherein the heating temperature of the ultrathin cover mother solution asphalt is 115-125 ℃, the temperature of the mineral aggregate is 140-150 ℃, and the delivery temperature of the mixture is 130-140 ℃;
step six: and (3) transporting the mixture: the dumper with the heat-insulating layer is used for transporting the mixture, the top of a carriage is covered by tarpaulin, and the arrival temperature of the mixture is not lower than 115 ℃;
step seven: spreading an ultrathin layer cover surface mixture: preheating a screed plate to 100 ℃ before paving, wherein the paving temperature of the ultrathin layer overlay mixture is 110-115 ℃, and discarding the mixture if the temperature of the mixture is lower than 90 ℃; the lowest temperature of the environment for paving construction is-2 ℃.
Step eight: rolling and forming: primarily pressing for two times by adopting 8-ton or 12-ton double steel wheels in a static pressure mode, then re-pressing and smoothing, controlling the rolling speed at 8km/h, and finishing rolling before the temperature of the mixture is reduced to 80 ℃;
step nine: checking and accepting to detect: detecting according to the national acceptance standard of the asphalt concrete pavement;
step ten, opening traffic: and opening the traffic after the pavement is cooled to below 40 ℃, and opening the traffic after 20-30 min under the condition that the environmental temperature is lower than 10 ℃.
The following table shows the performance indexes of the bonding waterproof layer (bonding oil) of the invention and the commonly used emulsified asphalt for PC-3 bonding in the prior art:
TABLE 2 performance index of bonded waterproof layer
Figure BDA0003036133610000071
Figure BDA0003036133610000081
It can be seen from the above table that the bonded waterproof layer of the present invention has higher storage stability and stronger bonding strength, and the bonded waterproof layer of the present invention has better permeability to cement and asphalt pavements.
Engineering example one: the maintenance engineering of the Yangyang riverside and North road section in Mianyang city is characterized in that the ultra-thin wearing layer has the construction total length of 5km, the start-up time is 1 month and early 2019, the construction period is 7 days, the engineering quantity is 80000 square meters, the thickness is 1.2-1.5cm, the operation period is close to 2 years, the pavement service performance is good, the advantages in the aspects of economic benefit and social benefit are obvious, and the high evaluation of owners and society is obtained.
Engineering example two: the project for overhauling the new intersection of the Chengde road has the advantages that the construction of an extremely thin wearing course is carried out in the whole field for 5km, the construction time is 2019, 11 and 21 months, the working is started, the construction period is 4 days, the project quantity is 60000 square meters, the thickness is 0.7-1.5cm, the operation period is 1 year, the service performance of the pavement is good, the economic and social benefits are obvious, and the high degree evaluation of owners and society is obtained.
Engineering example three: the special small town overhaul projects such as new urban kernel and village and the like are characterized in that an ultra-thin wearing layer (full-color pavement) has the construction total length of 30km, the start time is 10 months in 2020, the completion time is 10 months and 30 days, the project quantity is 200000 square meters, the thickness is 1-1.5cm, the operation period is 2 months, the construction period effect is remarkable, good pavement service performance is achieved, and the high evaluation of owners and society is obtained.
The above-mentioned embodiments only express the specific embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present application. It should be noted that, for those skilled in the art, without departing from the technical idea of the present application, several changes and modifications can be made, which are all within the protection scope of the present application.

Claims (9)

1. A road surface structure adopting warm mixing ultrathin layer cover is characterized in that: including former road surface (1), bonding waterproof layer (2), ultra-thin finish coat (3), former road surface (1) is handled through the disease, the surface of former road surface (1) is laid in bonding waterproof layer (2), the surface of bonding waterproof layer (2) is laid in ultra-thin finish coat (3), ultra-thin finish coat (3) are warm and mix ultra-thin finish coat finished product mixture OGFC ~ 5, ultra-thin finish coat (3) are the extremely thin wearing layer that 1 ~ 1.5cm is thick, and the oilstone ratio is 6.5% ~ 7.0%.
2. The pavement structure of claim 1, further comprising: the bonding waterproof layer (2) is pure oily bonding layer oil, and the spraying amount is 0.5-0.7 kg/m2
3. The pavement structure of claim 1, further comprising: the bonding waterproof layer (2) comprises 10-15 parts of SBS modified asphalt, 10-15 parts of SBR modified asphalt, 20-35 parts of rock asphalt, 3-4 parts of coumarone resin, 3-5 parts of emulsifier, 15-25 parts of water and 5-12 parts of high-strength quick-drying EVA emulsion glue.
4. The pavement structure of claim 1, further comprising: the ultrathin cover coat (3) comprises coarse aggregates and fine aggregates, the coarse aggregates are basalt with the particle size of 3-5 mm or other mineral aggregates with the hardness equivalent to that of the basalt, and the fine aggregates are machine-made sand with the particle size of 0-3 mm; the particle size of the mixture is in discontinuous gradation at the position of 2.36-4.75 mm, and the particle size of the mixture is in open gradation below 2.36 mm.
5. The pavement structure of claim 4, further comprising: the ultrathin covering layer (3) also comprises mineral powder, warm-mixed ultrathin covering mother liquor asphalt and polyester fiber, wherein the mass of each component accounts for 70-75% of coarse aggregate, 15-20% of fine aggregate, 3-5% of mineral powder and 2 thousandths of polyester fiber in the ultrathin covering layer (3), and the use amount of the warm-mixed ultrathin covering mother liquor asphalt is 6.5-7.0% of the total mass ratio of the coarse aggregate, the fine aggregate, the mineral powder and the polyurethane fiber.
6. The pavement structure of claim 5, further comprising: the warm-mixed ultrathin overlay mother liquor asphalt comprises 40-45 parts of SBS modified asphalt, 35-40 parts of SBR modified asphalt, 5-7 parts of rock asphalt, 1-2 parts of warm mixing agent, 2-3 parts of thermoplastic elastomer, 3-4 parts of coumarone resin, 0.5-0.8 part of stabilizer, 1-1.5 parts of anti-aging agent and 2-3.2 parts of dispersing agent.
7. The method for constructing a pavement structure using a warm-mix ultrathin layer overlay as claimed in any one of claims 1 to 6, wherein: the method comprises the following steps:
the method comprises the following steps: preparation before construction: the method comprises the steps of raw material preparation and mechanical preparation;
step two: treating the diseases of the original pavement: surveying and disposing the original pavement diseases, performing crack pouring or mending treatment on longitudinal cracks, transverse cracks and reticular cracks of old cement and asphalt pavements, and performing quick digging, filling changing and re-laying treatment on positions with the original pavement track being larger than 1cm or having problems of loosening, sinking, upwrapping, cracking, slurry turning and the like in advance;
step three: cleaning the road surface: removing sundries on the road surface and ensuring that the road surface is in a dry state during construction;
step four: spraying adhesive layer oil: the spraying amount of the coating oil is 0.5-0.7 kg/m2
Step five: production of ultrathin layer cover mixture: determining the proportion of aggregate, filler and modified asphalt of the mixture according to the design thickness of the ultrathin layer cover, wherein the heating temperature of the ultrathin cover mother solution asphalt is 115-125 ℃, the temperature of the mineral aggregate is 140-150 ℃, and the delivery temperature of the mixture is 130-140 ℃;
step six: and (3) transporting the mixture: the dumper with the heat-insulating layer is used for transporting the mixture, the top of a carriage is covered by tarpaulin, and the arrival temperature of the mixture is not lower than 115 ℃;
step seven: spreading an ultrathin layer cover surface mixture: preheating a screed plate to 100 ℃ before paving, wherein the paving temperature of the ultrathin layer overlay mixture is 110-115 ℃, and discarding the mixture if the temperature of the mixture is lower than 90 ℃;
step eight: rolling and forming: primarily pressing for two times by adopting 8-ton or 12-ton double steel wheels in a static pressure mode, then re-pressing and smoothing, controlling the rolling speed at 8km/h, and finishing rolling before the temperature of the mixture is reduced to 80 ℃;
step nine: checking and accepting to detect: detecting according to the national acceptance standard of the asphalt concrete pavement;
step ten, opening traffic: and opening the traffic after the pavement is cooled to below 40 ℃, and opening the traffic after 20-30 min under the condition that the environmental temperature is lower than 10 ℃.
8. The method of constructing a pavement structure using a warm mix ultra-thin overlay as claimed in claim 7, wherein: and step four, spraying the viscous layer oil 30-90 min before the mixture is spread.
9. The method of constructing a pavement structure using a warm mix ultra-thin overlay as claimed in claim 7, wherein: and seventhly, when the ultrathin layer overlay mixture is spread, the lowest temperature is-2 ℃.
CN202110443831.6A 2021-04-23 2021-04-23 Pavement structure adopting warm-mix ultrathin layer overlay and construction method thereof Pending CN114351529A (en)

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