CN114772979A - High-performance ultrathin asphalt wearing layer and paving method thereof - Google Patents
High-performance ultrathin asphalt wearing layer and paving method thereof Download PDFInfo
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- CN114772979A CN114772979A CN202210344290.6A CN202210344290A CN114772979A CN 114772979 A CN114772979 A CN 114772979A CN 202210344290 A CN202210344290 A CN 202210344290A CN 114772979 A CN114772979 A CN 114772979A
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- 239000010426 asphalt Substances 0.000 title claims abstract description 116
- 238000000034 method Methods 0.000 title claims abstract description 27
- 239000010410 layer Substances 0.000 claims abstract description 94
- 239000000463 material Substances 0.000 claims abstract description 18
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 15
- 239000011707 mineral Substances 0.000 claims abstract description 15
- 239000000835 fiber Substances 0.000 claims abstract description 14
- 229920000728 polyester Polymers 0.000 claims abstract description 14
- 239000000843 powder Substances 0.000 claims abstract description 13
- 239000000203 mixture Substances 0.000 claims description 36
- 239000002994 raw material Substances 0.000 claims description 14
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- 230000008569 process Effects 0.000 claims description 12
- 229920003048 styrene butadiene rubber Polymers 0.000 claims description 12
- 238000002156 mixing Methods 0.000 claims description 10
- 239000005038 ethylene vinyl acetate Substances 0.000 claims description 8
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 claims description 8
- 238000005096 rolling process Methods 0.000 claims description 8
- 238000003860 storage Methods 0.000 claims description 6
- 238000009826 distribution Methods 0.000 claims description 5
- 238000012545 processing Methods 0.000 claims description 5
- 239000011435 rock Substances 0.000 claims description 5
- 238000005507 spraying Methods 0.000 claims description 5
- 239000002174 Styrene-butadiene Substances 0.000 claims description 4
- XSTXAVWGXDQKEL-UHFFFAOYSA-N Trichloroethylene Chemical group ClC=C(Cl)Cl XSTXAVWGXDQKEL-UHFFFAOYSA-N 0.000 claims description 4
- 239000011280 coal tar Substances 0.000 claims description 4
- 239000004205 dimethyl polysiloxane Substances 0.000 claims description 4
- 229920001971 elastomer Polymers 0.000 claims description 4
- 229920000435 poly(dimethylsiloxane) Polymers 0.000 claims description 4
- -1 polydimethylsiloxane Polymers 0.000 claims description 4
- 239000005060 rubber Substances 0.000 claims description 4
- 238000010008 shearing Methods 0.000 claims description 4
- 229920001169 thermoplastic Polymers 0.000 claims description 4
- 239000004416 thermosoftening plastic Substances 0.000 claims description 4
- UBOXGVDOUJQMTN-UHFFFAOYSA-N trichloroethylene Natural products ClCC(Cl)Cl UBOXGVDOUJQMTN-UHFFFAOYSA-N 0.000 claims description 4
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 3
- 238000005299 abrasion Methods 0.000 claims description 3
- 239000012790 adhesive layer Substances 0.000 claims description 3
- 238000007580 dry-mixing Methods 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 3
- 230000007480 spreading Effects 0.000 claims description 3
- 238000003892 spreading Methods 0.000 claims description 3
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- 239000002131 composite material Substances 0.000 claims description 2
- 238000010276 construction Methods 0.000 abstract description 14
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- 238000002360 preparation method Methods 0.000 description 2
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- 235000019738 Limestone Nutrition 0.000 description 1
- 230000003712 anti-aging effect Effects 0.000 description 1
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- 229910052799 carbon Inorganic materials 0.000 description 1
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- GOLXNESZZPUPJE-UHFFFAOYSA-N spiromesifen Chemical compound CC1=CC(C)=CC(C)=C1C(C(O1)=O)=C(OC(=O)CC(C)(C)C)C11CCCC1 GOLXNESZZPUPJE-UHFFFAOYSA-N 0.000 description 1
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B26/00—Compositions of mortars, concrete or artificial stone, containing only organic binders, e.g. polymer or resin concrete
- C04B26/02—Macromolecular compounds
- C04B26/26—Bituminous materials, e.g. tar, pitch
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
- E01C19/45—Portable apparatus for preparing, or for preparing and applying to the road, compound liquid binders, e.g. emulsified bitumen, fluxed asphalt
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
- E01C19/48—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for laying-down the materials and consolidating them, or finishing the surface, e.g. slip forms therefor, forming kerbs or gutters in a continuous operation in situ
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C7/00—Coherent pavings made in situ
- E01C7/08—Coherent pavings made in situ made of road-metal and binders
- E01C7/32—Coherent pavings made in situ made of road-metal and binders of courses of different kind made in situ
- E01C7/34—Coherent pavings made in situ made of road-metal and binders of courses of different kind made in situ made of several courses which are not bound to each other ; Separating means therefor, e.g. sliding layers
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/0075—Uses not provided for elsewhere in C04B2111/00 for road construction
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/10—Mortars, concrete or artificial stone characterised by specific physical values for the viscosity
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
Abstract
The invention relates to the technical field of pavement construction, in particular to a high-performance ultrathin asphalt wearing layer and a paving method thereof, wherein the ultrathin asphalt wearing layer comprises a waterproof bonding layer arranged on the original pavement and a surface wearing layer arranged above the waterproof bonding layer; the surface wearing layer is prepared from the following components in parts by weight: 84-90 parts of aggregate, 5-8 parts of modified asphalt, 3-8 parts of mineral powder and 0.1-0.5 part of polyester fiber; the ultrathin asphalt wearing layer provided by the invention is used for pavement maintenance, and due to the adoption of the special binding material, the pavement has super interlayer binding performance, ageing resistance, reflection crack resistance and low-temperature crack resistance, and meanwhile, the ultrathin asphalt wearing layer has good construction workability, so that the wearing layer has thinner structural thickness.
Description
Technical Field
The invention relates to the technical field of pavement construction, in particular to a high-performance ultrathin asphalt wearing layer and a paving method thereof.
Background
At present, when the highway management department selects the maintenance measures of the asphalt pavement in the early and middle periods, the technologies of zero seal, micro surfacing, gravel seal and the like are mainly adopted. Practice shows that the prior art can improve the traffic capacity and service level of the existing road surface to a certain extent, but still has the technical defects of insufficient durability, high road surface noise, easy stripping, large milling workload, low construction efficiency, large interference on traffic of the existing road surface and the like.
The ultrathin asphalt overlay is widely applied at home and abroad as a fine, low-carbon and environment-friendly road pre-maintenance technology. The technology is a novel road maintenance technology, the core of the technology is special modified asphalt, special gradation and high-performance adhesive layer oil, and a layer of ultrathin asphalt top coat with the thickness of 1-2.5cm is directly paved on an old road surface by adopting a special construction process. The ultrathin asphalt overlay is the only hot-mixed asphalt mixture technology in various pre-curing technologies, has the characteristic of high performance of the hot-mixed asphalt mixture, and can meet the requirements of the pre-curing technology on quick construction and durability. Compared with other pre-maintenance technologies, the ultra-thin asphalt overlay has the accurate repair capacity of surgical operation, and is the most effective advanced technology in various pavement preventive maintenance technologies.
At present, various ultrathin asphalt overlay technologies in China are basically developed from NovachipTMThe technology has evolved, but the technology needs a special imported synchronous paving machine (about 600 ten thousand per machine), and the price is 3-4 times of that of domestic paving equipment, so that the ultrathin asphalt mat coat with high performance is provided, the popularization cost of the existing ultrathin asphalt mat coat technology is reduced, and the technical problem which is continuously solved by the personnel in the field is solved.
Disclosure of Invention
The invention aims to provide a high-performance ultrathin asphalt wearing layer, so that a pavement has super interlayer bonding performance, ageing resistance, reflection crack resistance, low-temperature crack resistance and good construction workability; meanwhile, the formed pavement also has the advantages of high driving comfort, high friction coefficient, low driving noise, ultrathin structural thickness and long service life.
In order to achieve the purpose, the invention adopts the following technical scheme:
a high-performance ultrathin asphalt wearing layer comprises a waterproof bonding layer arranged on an original pavement and a surface wearing layer arranged above the waterproof bonding layer;
the surface abrasion layer is prepared from the following components in parts by weight: 84-90 parts of aggregate, 5-8 parts of modified asphalt, 3-8 parts of mineral powder and 0.1-0.5 part of polyester fiber.
In a further technical scheme, relative to 100 parts by weight of the surface wearing layer, the modified asphalt comprises the following raw materials in parts by weight: 2.5-6.4 parts of asphalt, 0.5-1.6 parts of rock asphalt, 0.05-0.64 part of naphthenic base rubber oil, 0.1-0.8 part of SBS thermoplastic styrene-butadiene rubber and 0.50-0.70 part of EVA ethylene-vinyl acetate copolymer;
the raw material components are subjected to high-temperature and high-speed shearing compound processing to obtain the modified asphalt.
In a further technical scheme, the mineral powder is ground limestone alkaline stone.
In a further technical scheme, the polyester fibers are in a bundle shape, have the length of 6mm, and have good thermal stability and dispersibility.
In a further technical scheme, the waterproof bonding layer is prepared from the following components in parts by weight: 30-50 parts of asphalt, 20-40 parts of trichloroethylene, 10-30 parts of coal tar, 5-10 parts of SBR (styrene butadiene rubber) and 2-8 parts of polydimethylsiloxane.
The invention also provides a method for paving the high-performance ultrathin asphalt wearing layer, which comprises the steps of firstly spraying a bonding waterproof layer raw material mixture which is liquid at normal temperature onto the original pavement by using a high-pressure airless sprayer to form a waterproof bonding layer;
stirring and mixing the aggregate, the modified asphalt, the mineral powder and the polyester fiber at the temperature of 170-180 ℃ to obtain a mixture; and keeping the paving temperature to be more than or equal to 150 ℃, paving the mixture on the waterproof bonding layer, rolling at the temperature of more than 130 ℃ after paving is finished, and finishing the paving of the ultrathin asphalt wearing layer after the temperature of the pavement is reduced to be less than 50 ℃ after 2-3 times of rolling.
In a further technical scheme, in the paving process of the waterproof bonding layer, the spreading amount is 0.1-0.3kg/m2。
In a further technical scheme, the paving thickness of the mixture is a, and a is more than or equal to 1.0cm and less than or equal to 2.0 cm.
In a further technical scheme, the aggregate adopts special grading with the following particle size distribution:
a: the sieve mesh size is 9.5mm, and the aggregate passing rate is 100%;
b: the mesh size is 4.75mm, and the aggregate passing rate is 60-100%;
c: the mesh size is 2.36mm, and the aggregate passing rate is 15-35%;
d: the sieve mesh size is 1.18mm, and the aggregate passing rate is 10-25%;
e: the mesh size is 0.6mm, and the aggregate passing rate is 8-20%;
f: the sieve mesh size is 0.3mm, and the aggregate passing rate is 5-15%;
g: the sieve mesh size is 0.15mm, and the aggregate passing rate is 4-12%;
h: the mesh size is 0.075mm, and the aggregate passing rate is 3-8%.
In a further technical scheme, the mixture is prepared in the following way: the aggregate with the particle size of b is respectively loaded into a cold storage bin according to the particle sizes of b being more than 0 and less than 3mm and b being more than or equal to 3 and less than 7mm, then the aggregates are respectively transported to a hot storage bin, the aggregates are heated and dedusted in the transportation process, then the aggregates are jointly transported to a mixing cylinder, polyester fiber and mineral powder are added for dry mixing under the condition of the temperature of 170 plus materials of 180 ℃, then modified asphalt is added, and the mixture is obtained after uniform mixing.
Compared with the prior art, the invention has the following technical effects:
1. the ultrathin asphalt wearing layer provided by the invention is used for pavement maintenance, and due to the adoption of the special binding material, the pavement has super interlayer binding performance, ageing resistance, reflection crack resistance and low-temperature crack resistance, and meanwhile, the ultrathin asphalt wearing layer has good construction workability, so that the wearing layer has thinner structural thickness.
2. In the ultrathin asphalt wearing layer provided by the invention, the waterproof bonding layer material belongs to a non-wheel-sticking solvent material, and has better permeability compared with the traditional modified emulsified asphalt aqueous bonding material, the waterproof bonding layer material permeates into the old pavement to form a nail effect, and is not easily damaged by construction vehicles in the paving process after being sprayed; the waterproof bonding layer contains asphalt and various high polymers, the bonding strength and the shear strength of the waterproof bonding layer are greatly improved compared with modified emulsified asphalt bonding materials, the interlayer bonding effect is better, the penetration is good, the surface drying time is short, and the integral waterproof bonding effect of the old pavement and the surface wearing layer is ensured.
3. The ultrathin asphalt wearing layer provided by the invention has a simple paving process, adopts common asphalt mixing and paving equipment, does not need a special paver, greatly reduces the preparation difficulty and the construction difficulty of construction equipment, and is more beneficial to large-area popularization and implementation.
Detailed Description
In order to make the technical means, the creation features, the achievement purposes and the effects of the invention easy to understand, the invention is further clarified with the specific embodiments.
As described above, the present invention provides a high-performance ultra-thin asphalt wearing layer, which includes a waterproof bonding layer disposed on an original pavement and a surface wearing layer disposed above the waterproof bonding layer; the surface abrasion layer is prepared from the following components in parts by weight: 84-90 parts of aggregate, 5-8 parts of modified asphalt, 3-8 parts of mineral powder and 0.1-0.5 part of polyester fiber.
Further, in the invention, relative to 100 parts by weight of the surface wearing layer, the modified asphalt comprises the following raw materials in parts by weight: 2.5-6.4 parts of asphalt, 0.5-1.6 parts of rock asphalt, 0.05-0.64 part of naphthenic base rubber oil, 0.1-0.8 part of SBS thermoplastic styrene-butadiene rubber and 0.50-0.70 part of EVA ethylene-vinyl acetate copolymer;
the raw material components are subjected to high-temperature and high-speed shearing composite processing to obtain the modified asphalt.
According to the invention, the modified asphalt is used as a binder, the performances of the modified asphalt are greatly improved compared with those of common modified asphalt, the problems that the wearing layer requires good high-temperature and low-temperature performances and excellent aging resistance on the asphalt are solved, and meanwhile, the asphalt mixture is ensured to have good construction workability. The modified asphalt provided by the invention has higher softening point, low-temperature ductility, elastic recovery and toughness, is beneficial to preventing high-temperature rutting, pushing and reflection, low temperature and fatigue cracks of a wearing layer, and meanwhile, has excellent anti-aging performance, and ensures that a pavement has longer service life. Compared with the traditional thin overlay, the ultrathin asphalt wearing layer provided by the invention has better low-temperature crack resistance, water damage resistance, high-temperature stability and durability, thinner structure thickness, longer construction season, more comfortable driving of a formed pavement, less noise and revolutionary change.
According to the ultrathin asphalt wearing layer provided by the invention, in the surface wearing layer, the aggregate is preferably diabase or basalt aggregate, and the aggregate is harder and more wear-resistant than common limestone aggregate in a traditional wearing layer; compared with granite aggregate, the diabase or basalt aggregate has better adhesion with asphalt, thereby ensuring that the ultrathin asphalt wearing layer has better durability and skid resistance.
In the invention, the mineral powder is ground limestone alkaline stone.
The polyester fiber is in a bundle shape, has the length of 6mm, and has good thermal stability and dispersibility.
According to the ultrathin asphalt wearing layer provided by the invention, the waterproof bonding layer is prepared from the following components in parts by weight: 30-50 parts of asphalt, 20-40 parts of trichloroethylene, 10-30 parts of coal tar, 5-10 parts of SBR (styrene butadiene rubber) and 2-8 parts of polydimethylsiloxane.
The invention also provides a method for paving the high-performance ultrathin asphalt wearing layer, which comprises the steps of firstly spraying the raw material mixture of the waterproof bonding layer which is liquid at normal temperature onto the original pavement by using a high-pressure airless sprayer to form the waterproof bonding layer;
specifically, the raw material mixture that will form waterproof bonding layer is packed into the asphalt tank of asphalt distribution truck, adjust the height and the width of distributing the car nozzle, should pass through earlier before spraying and try to spout the inspection nozzle and whether unobstructed, if not unobstructed then should wash earlier the nozzle after try to spout again, until spraying the smoothness, even, be fan-shaped, set for the volume of spilling, spill the cloth at the in-process that asphalt distribution truck went at the uniform velocity, spill the in-process of cloth and strictly forbid open fire, form waterproof bonding layer on former road surface.
Furthermore, in the process of paving the waterproof bonding layer, the spreading amount is preferably 0.1-0.3kg/m2。
Then stirring and mixing the aggregate, the modified asphalt, the mineral powder and the polyester fiber at the temperature of 170-180 ℃ to obtain a mixture; and keeping the paving temperature to be more than or equal to 150 ℃, paving the mixture on the waterproof bonding layer, rolling at the temperature of more than 130 ℃ after paving is finished, and finishing the paving of the ultrathin asphalt wearing layer after the temperature of the pavement is reduced to be less than 50 ℃ after 2-3 times of rolling.
In the present invention, the gradation of the aggregate constituting the surface wearing layer can be selected in a wide range, and preferably, the aggregate is a special gradation having the following particle size distribution: a: the mesh size is 9.5mm, and the aggregate passing rate is 100%; b: the mesh size is 4.75mm, and the aggregate passing rate is 60-100%; c: the mesh size is 2.36mm, and the aggregate passing rate is 15-35%; d: the sieve mesh size is 1.18mm, and the aggregate passing rate is 10-25%; e: the sieve mesh size is 0.6mm, and the aggregate passing rate is 8-20%; f: the sieve mesh size is 0.3mm, and the aggregate passing rate is 5-15%; g: the sieve mesh size is 0.15mm, and the aggregate passing rate is 4-12%; h: the sieve pore size is 0.075mm, and the aggregate passing rate is 3-8%;
the special grading provided by the invention has the advantages that the coarse aggregate forms a framework in the mixture to mainly play a supporting role, the fine aggregate mainly plays a filling role in the mixture, and the void ratio is more than 8%.
According to the invention, the mixture is prepared in the following way: the aggregate has the particle size b, the aggregates are respectively loaded into cold storage bins according to the particle sizes that b is more than 0 and less than 3mm and b is more than or equal to 3 and less than 7mm, then the aggregates are respectively transported to hot storage bins, the aggregates are heated and dedusted in the transportation process, then the aggregates are jointly transported to a mixing cylinder, polyester fibers and mineral powder are added for dry mixing under the condition of the temperature of 170 plus materials of 180 ℃, then the modified asphalt is added, the mixture is obtained after uniform mixing, and the mixture is transported to a pavement paving site through a material transporting vehicle to be used.
Tests prove that the Marshall stability of the mixture is more than or equal to 6KN, the Marshall residual stability of the soaking water is more than or equal to 85%, and the scattering loss of Kentusburg is less than or equal to 10%.
In the concrete paving process, after the preparation of the working face is finished, the machine position and the optimal working state of the asphalt pavement paver are adjusted, and the quantity of the paver and the road roller is reasonably arranged according to the width and the field requirement of the pavement; the method comprises the following steps of preheating a screed plate (not lower than 100 ℃) before paving, unloading a mixture into a receiving hopper of a paver by a material conveying vehicle before starting paving, adjusting the paving width, the paving thickness and the paving speed in time in the paving process, continuously feeding the mixture while continuously paving the mixture by the paver in the uniform-speed advancing process, keeping the paving temperature to be more than or equal to 150 ℃, paving the mixture on a waterproof bonding layer, wherein the paving thickness is a, and a is more than or equal to 1.0cm and less than or equal to 2.0 cm; after the paving is finished, the asphalt mixture is rolled by a road roller at the temperature of more than 130 ℃, and after the rolling is carried out for 2-3 times, the temperature of the road surface is reduced to be below 50 ℃, so that the whole ultrathin asphalt wearing layer is paved.
After the rolling treatment of the road roller, the test shows that the friction coefficient swing value (BPN) of the surface wearing layer is more than or equal to 45, and the surface structure depth is more than or equal to 0.55 mm.
The ultra-thin asphalt wearing course provided by the present invention is further illustrated by the following specific examples.
Examples 1 to 4
The ultrathin asphalt wearing layers provided by the embodiments 1 to 4 of the invention comprise waterproof bonding layers arranged on the original pavement and surface wearing layers arranged above the waterproof bonding layers;
the raw materials used in examples 1-4 of the present invention are from the following sources:
aggregate (diabase): purchased from processing plants of Zecheng mineral products in Lingshou county, and the particle size is 1.5-7 mm;
aggregate (basalt): purchased from Fujian south Anxinhongsen Stone Co., Ltd, with a particle size of 2-8 mm;
mineral powder: purchased from a processing plant of Jiangfeng mineral products in Lingshu county, and the particle size is less than 0.074 mm;
polyester fiber: purchased from changzhou Tianyi limited, about 6mm in length;
asphalt: purchased from Shandong Union Haishi, Inc.;
rock asphalt: purchased from Anhui Mizhongyin Co., Ltd;
cycloalkyl rubber oil: purchased from Shandong Unisea Shinetization, Inc.;
SBS thermoplastic styrene-butadiene rubber: purchased from medium petrochemicals;
EVA ethylene-vinyl acetate copolymer: purchased from medium petrochemicals;
trichloroethylene: purchased from Hebei culvert Kai energy science and technology development Co., Ltd;
coal tar: purchased from Hebei culvert Kai energy science and technology development Co., Ltd;
SBR styrene-butadiene rubber: purchased from China petrochemical;
polydimethylsiloxane: purchased from Hebei culvert Kai energy science and technology development Co., Ltd.
The raw material components of the waterproof adhesive layers referred to in examples 1 to 4 are shown in table 1 in parts by weight; the raw material components of the surface wearing layers referred to in examples 1 to 4 are shown in Table 2 in parts by weight.
Table 1:
table 2:
comparative test data for the modified asphalt of inventive examples 1-4 and conventional SBS (1-D) modified asphalt (comparative) are shown in Table 3.
Table 3:
the asphalt softening point is an important index for evaluating the high-temperature stability of the asphalt, and the higher the value is, the better the high-temperature stability of the asphalt is. The ductility at 5 ℃ is an important index for evaluating the low-temperature performance of the asphalt, the elasticity recovery at 25 ℃ is an important index for evaluating the resilience performance of the asphalt, the viscosity at 25 ℃ is an important index for evaluating the elasticity toughness of the asphalt, and the larger the numerical values of the three indexes are, the better the reflection cracking resistance, the low-temperature cracking resistance and the fatigue cracking resistance of the asphalt are.
The results in table 3 show that each index of the modified asphalt adopted in the invention is much higher than the industry standard and the common modified asphalt, which indicates that the high temperature stability, the aging resistance and the low temperature cracking resistance of the modified asphalt provided in the invention are much higher than those of the common modified asphalt;
furthermore, compared with the traditional thin-layer cover surface, the ultrathin asphalt wearing layer provided by the invention has better crack resistance, water damage resistance, high-temperature stability and durability by using the modified asphalt as a binding material.
The ultra-thin asphalt wearing layers provided in examples 1 to 4 were paved according to the paving method provided by the present invention, and the paving process parameters corresponding to examples 1 to 4 are shown in table 4.
Table 4:
before the concrete pavement, the raw material mixture of the waterproof bonding layer is detected, common cation fast-cracking modified emulsified asphalt is used as comparison, a 25 ℃ bonding strength test is carried out, and the detection results are shown in table 5.
Table 5:
| item | Bond Strength (MPa) at 25 ℃ |
| Example 1 | 0.89 |
| Example 2 | 1.01 |
| Example 3 | 1.06 |
| Example 4 | 0.97 |
| Modified emulsified asphalt with quick-cracking common cation | 0.54 |
The bonding strength value is an important index for evaluating the bonding strength of the bonding material, the larger the numerical value is, the better the numerical value is, the detection result in the table 5 shows that the bonding strength of the waterproof bonding layer material adopted by the invention is far higher than that of the common quick-cracking modified emulsified asphalt, and further, the bonding strength between the traditional thin-layer overlay and the old pavement is greatly improved when the waterproof bonding layer material adopted by the ultrathin asphalt wearing layer provided by the invention is used as the bonding material.
The performance of the ultra-thin asphalt wearing layers paved in examples 1-4 was measured, and the measurement results are shown in table 6.
Table 6:
the structural depth of the pavement is called as texture depth in the past, and is an important index for evaluating the macroscopic structure, roughness and skid resistance of the pavement, and the larger the structural depth is, the better the skid resistance is; the pendulum value of the friction coefficient of the pavement is measured by a pendulum instrument, the local microcosmic structural condition of the pavement is reflected, and the larger the numerical value is, the better the anti-skid performance is; the road surface flatness refers to data of difference between uneven road surface and absolute level, and the flatness is better when the numerical value is smaller; the Marshall stability is used for evaluating the shearing resistance of the asphalt mixture, the larger the value is, the better the value is, the higher the strength of the asphalt mixture is, and the more difficultly damaged the molded pavement is; the water immersion Marshall stability is mainly used for evaluating the water damage resistance of the asphalt mixture, and the larger the numerical value is, the better the water damage resistance of the asphalt mixture is; the Kentunberg scattering test is mainly used for evaluating whether the viscosity of the asphalt used in the asphalt mixture is enough, whether the asphalt is less, and the like, wherein the smaller the numerical value is, the better the strength of the asphalt mixture is, and the diseases such as particle falling and the like are not easy to generate on the molded pavement.
The results in table 6 show that all indexes of the ultrathin asphalt wearing layer meet the industrial standards, wherein the construction depth, the swing value of the friction coefficient, the marshall stability, the soaking marshall residual stability and the kentuck scattering loss are far higher than those of the traditional industrial standards, so that the ultrathin asphalt wearing layer has the characteristics of super-strong reflection cracking resistance, low-temperature cracking resistance, fatigue cracking resistance and high-temperature stability, and meanwhile, the pavement also has the characteristics of driving comfort, water resistance, skid resistance, durability and the like.
The foregoing shows and describes the general principles, essential features, and inventive features of this invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are given by way of illustration of the principles of the present invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention, and such changes and modifications are within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. A high-performance ultrathin asphalt wearing layer is characterized by comprising a waterproof bonding layer arranged on an original pavement and a surface wearing layer arranged above the waterproof bonding layer;
the surface abrasion layer is prepared from the following components in parts by weight: 84-90 parts of aggregate, 5-8 parts of modified asphalt, 3-8 parts of mineral powder and 0.1-0.5 part of polyester fiber.
2. The high-performance ultrathin asphalt wearing layer as claimed in claim 1, wherein the modified asphalt comprises the following raw materials in parts by weight for 100 parts by weight of the surface wearing layer: 2.5-6.4 parts of asphalt, 0.5-1.6 parts of rock asphalt, 0.05-0.64 part of naphthenic base rubber oil, 0.1-0.8 part of SBS thermoplastic styrene-butadiene rubber and 0.50-0.70 part of EVA ethylene-vinyl acetate copolymer;
the raw material components are subjected to high-temperature and high-speed shearing composite processing to obtain the modified asphalt.
3. The high performance ultra-thin bituminous wearing course of claim 1, wherein said ore fines are ground limestone base rock.
4. The high performance ultra-thin asphalt wearing layer as claimed in claim 1, wherein the polyester fiber is in the form of bundle with a length of 6mm, and has good thermal stability and dispersibility.
5. The high-performance ultrathin asphalt wearing layer as claimed in claim 1, wherein the waterproof bonding layer is prepared from the following components in parts by weight: 30-50 parts of asphalt, 20-40 parts of trichloroethylene, 10-30 parts of coal tar, 5-10 parts of SBR (styrene butadiene rubber) and 2-8 parts of polydimethylsiloxane.
6. A method for paving the high-performance ultrathin asphalt wearing layer as claimed in any one of claims 1 to 5, which is characterized by comprising the steps of firstly spraying a bonding waterproof layer raw material mixture which is liquid at normal temperature onto the original pavement by using a high-pressure airless sprayer to form a waterproof bonding layer;
stirring and mixing the aggregate, the modified asphalt, the mineral powder and the polyester fiber at the temperature of 170-180 ℃ to obtain a mixture; and keeping the paving temperature to be more than or equal to 150 ℃, paving the mixture on the waterproof bonding layer, rolling at the temperature of more than 130 ℃ after paving is finished, and finishing the paving of the ultrathin asphalt wearing layer after the temperature of the pavement is reduced to be less than 50 ℃ after 2-3 times of rolling.
7. The method according to claim 6, wherein the amount of said spreading is 0.1-0.3kg/m during the application of said waterproof adhesive layer2。
8. The method as claimed in claim 6, wherein the paving thickness of the mixed material is a, and a is more than or equal to 1.0cm and less than or equal to 2.0 cm.
9. A method according to claim 6, wherein the aggregate is specially graded with the following particle size distribution:
a: the mesh size is 9.5mm, and the aggregate passing rate is 100%;
b: the mesh size is 4.75mm, and the aggregate passing rate is 60-100%;
c: the mesh size is 2.36mm, and the aggregate passing rate is 15-35%;
d: the sieve mesh size is 1.18mm, and the aggregate passing rate is 10-25%;
e: the sieve mesh size is 0.6mm, and the aggregate passing rate is 8-20%;
f: the mesh size is 0.3mm, and the aggregate passing rate is 5-15%;
g: the mesh size is 0.15mm, and the aggregate passing rate is 4-12%;
h: the mesh size is 0.075mm, and the aggregate passing rate is 3-8%.
10. The method according to claim 6, wherein the mix is prepared by: the aggregate with the particle size of b is respectively loaded into a cold storage bin according to the particle sizes of b being more than 0 and less than 3mm and b being more than or equal to 3 and less than 7mm, then the aggregates are respectively transported to a hot storage bin, the aggregates are heated and dedusted in the transportation process, then the aggregates are jointly transported to a mixing cylinder, polyester fiber and mineral powder are added for dry mixing under the condition of the temperature of 170 plus materials of 180 ℃, then modified asphalt is added, and the mixture is obtained after uniform mixing.
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