CN114180886B - Self-adhesive asphalt concrete and preparation method and construction process thereof - Google Patents
Self-adhesive asphalt concrete and preparation method and construction process thereof Download PDFInfo
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- CN114180886B CN114180886B CN202111603773.5A CN202111603773A CN114180886B CN 114180886 B CN114180886 B CN 114180886B CN 202111603773 A CN202111603773 A CN 202111603773A CN 114180886 B CN114180886 B CN 114180886B
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- 239000011384 asphalt concrete Substances 0.000 title claims abstract description 63
- 239000000853 adhesive Substances 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000010276 construction Methods 0.000 title claims abstract description 16
- 238000002360 preparation method Methods 0.000 title claims abstract description 9
- 239000010426 asphalt Substances 0.000 claims abstract description 133
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 61
- 239000011707 mineral Substances 0.000 claims abstract description 61
- 239000003607 modifier Substances 0.000 claims abstract description 44
- 239000011230 binding agent Substances 0.000 claims abstract description 39
- 239000000843 powder Substances 0.000 claims abstract description 31
- 229920001971 elastomer Polymers 0.000 claims abstract description 25
- 239000011148 porous material Substances 0.000 claims description 20
- 238000002156 mixing Methods 0.000 claims description 18
- 235000019738 Limestone Nutrition 0.000 claims description 10
- 239000006028 limestone Substances 0.000 claims description 10
- 239000002245 particle Substances 0.000 claims description 10
- 238000010438 heat treatment Methods 0.000 claims description 9
- 239000000945 filler Substances 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 8
- 229920000468 styrene butadiene styrene block copolymer Polymers 0.000 claims description 6
- 230000035515 penetration Effects 0.000 claims description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 2
- 239000010692 aromatic oil Substances 0.000 claims description 2
- 239000006229 carbon black Substances 0.000 claims description 2
- 239000002270 dispersing agent Substances 0.000 claims description 2
- 238000000227 grinding Methods 0.000 claims description 2
- 239000003208 petroleum Substances 0.000 claims description 2
- 238000005498 polishing Methods 0.000 claims description 2
- 239000011347 resin Substances 0.000 claims description 2
- 229920005989 resin Polymers 0.000 claims description 2
- 239000003381 stabilizer Substances 0.000 claims description 2
- 239000004567 concrete Substances 0.000 claims 1
- 230000003009 desulfurizing effect Effects 0.000 claims 1
- 239000010410 layer Substances 0.000 description 33
- 238000005096 rolling process Methods 0.000 description 13
- 230000032798 delamination Effects 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 230000001360 synchronised effect Effects 0.000 description 4
- 238000005507 spraying Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 239000012790 adhesive layer Substances 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000011229 interlayer Substances 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000013521 mastic Substances 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 239000002356 single layer Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000001723 curing Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 239000010705 motor oil Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 230000003449 preventive effect Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
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
- E01C11/00—Details of pavings
- E01C11/005—Methods or materials for repairing pavings
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C11/00—Details of pavings
- E01C11/24—Methods or arrangements for preventing slipperiness or protecting against influences of the weather
-
- 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
- E01C7/35—Toppings or surface dressings; Methods of mixing, impregnating, or spreading them
- E01C7/358—Toppings or surface dressings; Methods of mixing, impregnating, or spreading them with a combination of two or more binders according to groups E01C7/351 - E01C7/356
-
- 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
- C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
-
- 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
- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Road Paving Structures (AREA)
Abstract
The invention belongs to the technical field of road engineering, and particularly relates to self-adhesive asphalt concrete and a preparation method and a construction process thereof. The asphalt concrete comprises mineral aggregate and asphalt binder, wherein the mass content ratio of the asphalt binder to the mineral aggregate is 5.9-7.0:100, the asphalt binder comprises asphalt, a direct-vat-set high-viscosity asphalt modifier and a direct-vat-set rubber powder asphalt modifier, wherein the direct-vat-set high-viscosity asphalt modifier accounts for 9-14% of the mass of the asphalt binder; the mass percentage of the direct-throwing rubber powder asphalt modifier in the asphalt binder is less than or equal to 25%. The self-adhesive asphalt concrete has excellent cohesive force, can form effective adhesion with a clean (or sprayed with common emulsified asphalt) original pavement, and obtains the ultrathin layer pavement thickness of 10-25 mm through mineral aggregate gradation adjustment.
Description
Technical Field
The invention belongs to the technical field of road engineering, and particularly relates to self-adhesive asphalt concrete and a preparation method and a construction process thereof.
Background
Ultrathin layer pavement is mostly applied to preventive maintenance or surface maintenance of roads. Due to the fact that the pavement thickness is small, the pavement structure has the advantage of excellent cost performance (compared with a common asphalt concrete surface layer with the thickness of 4 cm); meanwhile, compared with the treatment technology of surface sealing layers, the ultrathin layer pavement has the excellent performance advantage of the asphalt concrete, and the service life of the ultrathin layer pavement is longer than that of the treatment technology of the surface sealing layers.
However, due to the characteristics of ultrathin layer pavement, the ultrathin layer pavement also has the corresponding application requirements:
1) The ultrathin layer pavement is thin, and needs to be fully bonded with the original pavement to avoid interlayer slippage and delamination. At present, interlayer adhesion of common ultrathin layer pavement adopts high-performance non-stick wheel emulsified asphalt, high-viscosity hot asphalt and the like. But the cost of the non-stick wheel emulsified asphalt is higher, and the spraying process is complicated; the high-viscosity hot asphalt has better adhesion performance, but the spraying and paving are required to be carried out synchronously, and the synchronous paver is high in price and less;
2) The performances of the ultrathin layer paved asphalt concrete are uneven and limited by the ultrathin layer pavement, the compactness of the ultrathin layer paved asphalt concrete can not reach the standard of a sample for indoor inspection, the incompletely compacted asphalt concrete is easy to seep water, and the performances of the ultrathin layer paved asphalt concrete can not be brought into play.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide a self-adhesive asphalt concrete which has excellent cohesive force and can effectively adhere to a clean road surface (or a road surface on which ordinary emulsified asphalt is spread); on the other hand, the steel has excellent strength, crack resistance, displacement resistance, delamination resistance and skid resistance. In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the self-adhesive asphalt concrete comprises mineral aggregate and asphalt binder, wherein the mass content ratio of the asphalt binder to the mineral aggregate is 5.9-7.0:100, the asphalt binder comprises asphalt, a direct-vat high-viscosity asphalt modifier and a direct-vat rubber powder asphalt modifier, wherein the direct-vat high-viscosity asphalt modifier accounts for 9-14% of the mass of the asphalt binder; the mass percentage of the direct-throwing rubber powder asphalt modifier in the asphalt binder is less than or equal to 25%.
In some embodiments, the direct vat set high viscosity asphalt modifier comprises from 50% to 70% by weight of a styrene-butadiene-styrene block copolymer; the main weight proportion of the direct-throwing rubber powder asphalt modifier is 70-90% of rubber powder.
In some embodiments, the performance criteria of the asphalt binder meet the following requirements: the penetration degree at 25 ℃ is 3-5mm; the softening point is not lower than 85 ℃; ductility at 5 deg.C is not less than 25cm; the flash point is not less than 250 ℃; the change rate of the heating quality of the film is not more than 1 percent; the residual rate of the penetration degree of the film heating needle is not less than 65 percent; the viscosity and toughness at 25 ℃ is not less than 20 N.m; toughness at 25 ℃ is not less than 16 N.m, and viscosity at 60 ℃ is not less than 350000 Pa.s.
In some technical schemes, the No. 50 asphalt, the No. 70 asphalt and the No. 90 asphalt are respectively selected according to the hot degree of the local climate from high to low.
In some technical schemes, when the pavement thickness of the self-adhesive asphalt concrete is 20mm-25mm and the maximum nominal grain diameter is 9.5mm, the mass content ratio of the asphalt binder to the mineral aggregate is 5.9-6.6:100, the grading range of the mineral aggregate is as follows: the mass percentage of the filter screen passing through a 9.5mm sieve pore is 85-100%, the mass percentage of the filter screen passing through a 4.75mm sieve pore is 30-50%, the mass percentage of the filter screen passing through a 2.36mm sieve pore is 20-35%, and the mass percentage of the filter screen passing through a 0.075mm sieve pore is 6-12%.
In some technical schemes, when the pavement thickness of the self-adhesive asphalt concrete is 15mm-25mm and the maximum nominal particle size is 6mm, the mass content ratio of the asphalt binder to the mineral aggregate is 6-6.7:100, the grading range of the mineral aggregate is as follows: the mass percentage of the filter screen passing through the 9.5mm sieve hole is 95-100%, the mass percentage of the filter screen passing through the 4.75mm sieve hole is 35-55%, the mass percentage of the filter screen passing through the 2.36mm sieve hole is 25-42%, and the mass percentage of the filter screen passing through the 0.075mm sieve hole is 7-14%.
In some technical schemes, when the pavement thickness of the self-adhesive asphalt concrete is 10mm-20mm and the maximum nominal grain diameter is 4.75mm, the mass content ratio of the asphalt binder to the mineral aggregate is 6.2-7.0:100, the grading range of the mineral aggregate is as follows: the mass percentage of the sieve which passes through a sieve pore of 4.75mm is 80-100%, the mass percentage of the sieve which passes through a sieve pore of 2.36mm is 28-45%, and the mass percentage of the sieve which passes through a sieve pore of 0.075mm is 10-16%.
In some embodiments, the mineral aggregate comprises coarse aggregate, fine aggregate, and filler, the coarse aggregate being diabase or basalt aggregate having a nominal particle size of greater than 2.36 mm; the fine aggregate is limestone aggregate with a nominal particle size of less than 2.36mm, and the filler is limestone mineral powder.
The second purpose of the invention is to provide a preparation method of the self-adhesive asphalt concrete, the direct-vat-set high-viscosity asphalt modifier is synchronously completed in the asphalt concrete mixing process, the application is convenient, and the asphalt concrete has high strength and excellent shear resistance and fatigue resistance. The adopted technical scheme is as follows:
the preparation method of the self-adhesive asphalt concrete comprises the following steps: heating the mineral aggregate to 170-190 ℃, adding a direct-throwing high-viscosity asphalt modifier according to the mass ratio, mixing, and mixing with an asphalt binder preheated to 135-160 ℃.
The invention also aims to provide the construction process of the self-adhesive asphalt concrete, which is applied to ultrathin layer pavement construction, can reduce the ultrathin layer pavement thickness to 10-25 mm, and has the advantages of simple process, strong operability and high construction efficiency. The adopted technical scheme is as follows:
the construction process of the self-adhesive asphalt concrete is applied to ultrathin layer pavement construction and comprises the following steps: the self-adhesive asphalt concrete is mechanically spread, compacted and rolled at the temperature of more than 150 ℃ for polishing.
The invention adopts the technical scheme and at least has the following beneficial effects:
1. the asphalt binder with higher dosage added with the direct-throwing high-viscosity asphalt modifier is adopted to form high-viscosity asphalt mastic with the thickness of more than 15 mu m on the surface of mineral aggregate, can form effective bonding with the clean (or sprayed with common emulsified asphalt) road surface, and has the characteristic of self-adhesion; the direct-throwing type rubber powder asphalt modifier is added into the asphalt binder, so that the strength of the asphalt binder can be greatly improved, and an asphalt concrete layer has excellent heat resistance, water resistance, frost resistance and rutting resistance;
2. the mineral aggregate grading composition designed in a pertinence way is easy to pave and compact, has good integrity, is suitable for different bearing capacities and original pavement conditions, and can select asphalt concrete with different pavement thicknesses and corresponding maximum nominal grain sizes;
3. the self-adhesive asphalt concrete is particularly suitable for ultrathin layer pavement construction, can reduce the ultrathin layer pavement thickness to 10-25 mm, does not need to spread a non-stick wheel emulsified asphalt bonding layer, does not need to spread high-viscosity asphalt by a synchronous spreader to serve as the bonding layer, and has excellent single-layer strength, durability such as crack resistance, push resistance, delamination resistance and the like and excellent surface anti-slip performance.
Detailed Description
The invention will be further illustrated with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims. The various reagents used in the examples are commercially available.
The application provides a self-adhesive asphalt concrete, including mineral aggregate and asphalt binder, the mass content ratio of asphalt binder and mineral aggregate is 5.9-7.0:100.
the asphalt binder is prepared by blending asphalt, a direct-vat-set high-viscosity asphalt modifier and a direct-vat-set rubber powder asphalt modifier, wherein the direct-vat-set high-viscosity asphalt modifier accounts for 9-14% of the mass of the asphalt binder, and the direct-vat-set rubber powder asphalt modifier accounts for 0-25% of the mass of the asphalt binder. It should be noted that the asphalt herein can be selected from No. 50 asphalt, no. 70 asphalt and No. 90 asphalt according to the degree of heat of the local climate.
In this embodiment, adopt the compound modified high viscosity asphalt binder of direct-vat-set high viscosity asphalt modifier and direct-vat-set rubber powder asphalt modifier, ordinary modified asphalt viscosity is lower, cause the asphalt mixture ability of shearing, fatigue resistance can not enough, use to appear easily on the ultrathin layer is paved and is passed, phenomenon such as loose, this application creatively adopts 2 kinds of direct-vat-set asphalt modifier compound modification, make it not only possess excellent cohesive force, direct-vat-set modification mode is accomplished in asphalt concrete mix in-process in step simultaneously, convenient to use and asphalt concrete intensity is high, shear, fatigue resistance can be outstanding.
In the embodiment, the asphalt consumption of the high-viscosity asphalt concrete is higher, the high-viscosity asphalt concrete belongs to rich asphalt concrete, the high-viscosity asphalt enables the asphalt concrete to have good cohesiveness to the clean (or common emulsified asphalt adhesive layer adopted) original pavement, no equipment for adhering wheel emulsified asphalt or hot asphalt (synchronous paving) is needed, meanwhile, the thickness of asphalt mastic on the surface of mineral aggregate of the asphalt concrete is larger than 15 mu m, and the rich high-viscosity asphalt is not easy to leak in the transportation process.
In one embodiment, the direct vat bitumen modifier consists essentially of: styrene-butadiene-styrene block copolymer, petroleum resin and over 1000 mesh ground diatomite roasting product mixture. Wherein SBS (styrene-butadiene-styrene block copolymer) accounts for 50-70% of the total amount of the additive;
the main components of the direct-throwing rubber powder asphalt modifier are 70-90% of tire recovered rubber powder after grinding, desulfurization and curing, and fluffy rubber powder which is extruded by double screws together by adding carbon black powder, oil components (aromatic oil is used as a main component, engine oil, recovered gutter oil and the like), a stabilizer and a dispersing agent.
The high-viscosity asphalt binder prepared according to the component proportion meets the performance indexes listed in the following table:
TABLE 1
In a preferred embodiment, for different bearing capacities and original road surface conditions, the following pavement thickness and corresponding maximum nominal grain size asphalt concrete can be selected.
When the pavement thickness of the self-adhesive asphalt concrete is 20mm-25mm and the maximum nominal particle size is 9.5mm, the mass content ratio of the asphalt binder to the mineral aggregate is 5.9-6.6:100, the grading range of the mineral aggregate is as follows: the mass percentage of the filter screen passing through a 9.5mm sieve pore is 85-100%, the mass percentage of the filter screen passing through a 4.75mm sieve pore is 30-50%, the mass percentage of the filter screen passing through a 2.36mm sieve pore is 20-35%, and the mass percentage of the filter screen passing through a 0.075mm sieve pore is 6-12%.
When the pavement thickness of the self-adhesive asphalt concrete is 15mm-25mm and the maximum nominal particle size is 6mm, the mass content ratio of the asphalt binder to the mineral aggregate is 6-6.7:100, the grading range of the mineral aggregate is as follows: the mass percentage of the filter screen passing through the 9.5mm sieve hole is 95-100%, the mass percentage of the filter screen passing through the 4.75mm sieve hole is 35-55%, the mass percentage of the filter screen passing through the 2.36mm sieve hole is 25-42%, and the mass percentage of the filter screen passing through the 0.075mm sieve hole is 7-14%.
When the pavement thickness of the self-adhesive asphalt concrete is 10-20 mm and the maximum nominal particle size is 4.75mm, the mass content ratio of the asphalt binder to the mineral aggregate is 6.2-7.0:100, the grading range of the mineral aggregate is as follows: the mass percentage of the sieve which passes through a sieve pore of 4.75mm is 80-100%, the mass percentage of the sieve which passes through a sieve pore of 2.36mm is 28-45%, and the mass percentage of the sieve which passes through a sieve pore of 0.075mm is 10-16%.
The mineral aggregate gradation designed in a targeted manner in the embodiment is easy to pave and compact, has good integrity, can reduce the thickness of a pavement layer to 10-25 mm, and obviously reduces the pavement construction counterfeiting compared with the conventional pavement with the pavement thickness of 40 mm.
In another preferred embodiment, the mineral aggregate comprises coarse aggregate, fine aggregate and filler, the coarse aggregate being diabase or basalt aggregate having a nominal particle size of greater than 2.36 mm; the fine aggregate is limestone aggregate with a nominal particle size of less than 2.36mm, and the filler is limestone mineral powder.
The application also provides a preparation method of the self-adhesive asphalt concrete, which comprises the following steps: heating the dry graded mineral aggregate to 170-190 ℃, adding the direct-throwing type rubber powder asphalt modifier for mixing for 5-15 s, adding the direct-throwing type high-viscosity asphalt modifier for mixing for 10-15 s, then adding the asphalt with the temperature of 135-160 ℃ for mixing for 30-60 s, and then transporting and paving. Wherein the direct-throwing rubber powder asphalt modifier and the direct-throwing high-viscosity asphalt modifier can be added simultaneously and the mixing time is prolonged to 10s-20s.
In the embodiment, the direct-vat-set high-viscosity asphalt modifier and the direct-vat-set rubber powder asphalt modifier are synchronously completed in the asphalt concrete mixing process, the application is convenient, and the asphalt concrete has high strength and excellent shearing resistance and fatigue resistance.
The application also provides a construction process of the self-adhesive asphalt concrete, which comprises the following steps: mechanically paving the self-adhesive asphalt concrete at the temperature of more than 150 ℃, statically rolling and compacting for more than 2 times to 3 times (the rolling is counted as 1 time), then rolling for 1 time by using a 26-40-ton rubber wheel road roller, and finally rolling and finishing by using a double-steel wheel road roller.
The method is applied to ultrathin layer pavement construction, the ultrathin layer pavement thickness can be reduced to 10-25 mm, and the method is simple and convenient in process, high in operability and efficient in construction.
In order to better understand the above steps of design preparation, production blending and paving rolling of the self-adhesive asphalt concrete, the following examples are given in the present application for detailed description:
in one example, a 5-10 basalt mineral aggregate S12 conforming to JTG F40-2004 was used, at 66% usage; 0-3 parts of limestone mineral aggregate S16, with the dosage of 25%; and limestone mineral powder filler, the amount is 9%; the total mineral aggregate dosage is 100 percent.
The mineral aggregate is graded, wherein the mass percentage of the mineral aggregate passing through a 9.5mm sieve hole is 91.0 percent, the mass percentage of the mineral aggregate passing through a 4.75mm sieve hole is 43.7 percent, the mass percentage of the mineral aggregate passing through a 2.36mm sieve hole is 32.8 percent, and the mass percentage of the mineral aggregate passing through a 0.075mm sieve hole is 11.1 percent. The proportion of the high-viscosity asphalt to mineral aggregate is 6.3%, wherein the high-viscosity asphalt comprises 75% of No. 70 asphalt, 10% of direct-throwing type high-viscosity asphalt modifier and 15% of direct-throwing type rubber powder asphalt modifier.
The properties of the graded composition asphalt binder as measured are shown in table 2:
TABLE 2
Heating the graded mineral aggregate to 190 ℃ by applying intermittent asphalt mixing, adding the direct-throwing high-viscosity asphalt modifier and the direct-throwing rubber powder asphalt modifier, mixing for 15s, adding No. 70 asphalt at 150 ℃, mixing for 45s, and then transporting and paving.
The original pavement is a newly-built clean asphalt concrete pavement, the surface of the original pavement is modified asphalt AC-16C asphalt concrete, the original pavement is not polluted after AC-16C construction is finished, and the ultrathin layer pavement of the embodiment is directly paved.
Mechanically paving the self-adhesive asphalt concrete with the maximum nominal grain size of 9.5mm at the temperature of more than 150 ℃ (generally about 165 ℃), paving the target with the thickness of 22mm +/-3 mm, statically rolling and compacting for more than 2 times-3 times (the rolling is repeated for 1 time) by using a double-steel-wheel road roller, rolling for 1 time by using a 26-ton rubber-wheel road roller, and finally rolling and collecting light by using the double-steel-wheel road roller.
In another example, a 3-5 basalt mineral aggregate S14 conforming to JTG F40-2004 specification is used in an amount of 68%;0-3 parts of limestone mineral aggregate S16, with the use amount being 20%; and limestone mineral powder filler, the amount is 12%; the total mineral aggregate dosage is 100 percent.
The mineral aggregate is graded, the mass percentage of the mineral aggregate passing through a 4.75mm sieve pore is 91.5 percent, the mass percentage of the mineral aggregate passing through a 2.36mm sieve pore is 31.2 percent, and the mass percentage of the mineral aggregate passing through a 0.075mm sieve pore is 13.4 percent. The proportion of the high-viscosity asphalt to mineral aggregate is 6.8%, wherein the high-viscosity asphalt comprises 87% of No. 70 asphalt and 13% of direct-throwing high-viscosity asphalt modifier.
The properties of the graded composition asphalt binder as measured are shown in table 3:
TABLE 3
Heating the graded mineral aggregate to 190 ℃ by using intermittent asphalt mixing, adding a direct-throwing high-viscosity asphalt modifier for mixing for 12s, adding No. 70 asphalt at 150 ℃ for mixing for 40s, and then transporting and paving.
The original pavement is an SMA-13 surface layer, surface finish milling and planing treatment is carried out, SBR modified emulsified asphalt adhesive layer PCR is sprayed, the spraying amount is 0.4kg/m < 2 >, and after 3 hours, demulsification is carried out, and then the ultrathin layer of the embodiment is paved.
Mechanically paving the self-adhesive asphalt concrete with the maximum nominal grain size of 4.75mm at the temperature of more than 150 ℃ (generally about 165 ℃), paving the target with the thickness of 15mm +/-5 mm, statically rolling and compacting for more than 2 times to 3 times (the rolling back and forth is counted as 1 time) by using a double-steel-wheel road roller, rolling for 1 time by using a 26-ton rubber-wheel road roller, and finally rolling and collecting light by using the double-steel-wheel road roller.
The results of the performance test of the asphalt concrete of the two examples are as follows:
TABLE 4
| Sample item | Unit | Example 1 | Example 2 |
| Relative density of test piece | 2.510 | 2.445 | |
| Theoretical relative density | 2.593 | 2.575 | |
| Void fraction | ％ | 3.23 | 5.06 |
| Marshall stability | kN | 10.80 | 8.61 |
| Dynamic stability of Rut test (60 ℃ C.) | Sub/mm | 6720 | 4058 |
| Kentuck scattering loss rate (20 ℃ C.) | ％ | 2.88 | 1.85 |
By adopting the two examples, after pavement is paved, the pavement is cooled to below 60 ℃, namely, the traffic is opened, and the pavement detection is carried out after the vehicle is opened for 6 months, so that the result shows that the pavement layer is complete, and the pavement layer has no push, no crack and no rut.
To sum up, the self-adhesive asphalt concrete ultrathin layer pavement disclosed by the application reduces the paving thickness of the ultrathin layer to 10-25 mm, does not need to spread a non-stick wheel emulsified asphalt bonding layer, does not need to spread high-viscosity asphalt by a synchronous spreader to serve as the bonding layer, and has excellent single-layer strength, durability such as crack resistance, push resistance, delamination resistance and the like and excellent surface anti-slip performance.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (9)
1. The self-adhesive asphalt concrete is characterized by comprising mineral aggregate and asphalt binder, wherein the mass content ratio of the asphalt binder to the mineral aggregate is 5.9-7.0:100,
the asphalt binder comprises asphalt, a direct-vat-set high-viscosity asphalt modifier and a direct-vat-set rubber powder asphalt modifier, wherein the direct-vat-set high-viscosity asphalt modifier accounts for 9-14% of the mass of the asphalt binder; the mass percentage of the direct-throwing rubber powder asphalt modifier in the asphalt binder is 0-25%;
the direct-throwing type high-viscosity asphalt modifier mainly comprises a styrene-butadiene-styrene block copolymer, petroleum resin and a mixture of more than 1000-mesh ground diatomite baked products, wherein the styrene-butadiene-styrene block copolymer accounts for 50-70% of the total amount of the direct-throwing type high-viscosity asphalt modifier;
the direct-throwing rubber powder asphalt modifier is fluffy rubber powder which is prepared by grinding, desulfurizing and curing tire reclaimed rubber powder by 70-90%, adding carbon black powder, aromatic oil, a stabilizer and a dispersing agent, and extruding the mixture by a double screw.
2. The self-adhesive asphalt concrete according to claim 1, wherein the performance index of the asphalt binder meets the following requirements: the penetration degree at 25 ℃ is 3-5mm; the softening point is not lower than 85 ℃; ductility at 5 deg.C is not less than 25cm; the flash point is not less than 250 ℃; the change rate of the heating quality of the film is not more than 1 percent; the residual rate of the penetration degree of the film heating needle is not less than 65%; the viscosity and toughness at 25 ℃ is not less than 20 N.m; toughness at 25 ℃ is not less than 16 N.m, and viscosity at 60 ℃ is not less than 350000 Pa.s.
3. The self-adhesive asphalt concrete according to claim 1, wherein the asphalt is selected from No. 50 asphalt, no. 70 asphalt and No. 90 asphalt according to the local climate.
4. The self-adhesive asphalt concrete according to claim 1, wherein when the pavement thickness of the self-adhesive asphalt concrete is 20mm to 25mm and the maximum nominal grain diameter is 9.5mm, the mass content ratio of the asphalt binder to the mineral aggregate is 5.9 to 6.6:100,
the grading range of the mineral aggregate is as follows: the mass percentage of the sieve passing through the sieve hole with the diameter of 9.5mm is 85-100%, the mass percentage of the sieve passing through the sieve hole with the diameter of 4.75mm is 30-50%, the mass percentage of the sieve passing through the sieve hole with the diameter of 2.36mm is 20-35%, and the mass percentage of the sieve passing through the sieve hole with the diameter of 0.075mm is 6-12%.
5. The self-adhesive asphalt concrete according to claim 1, wherein when the pavement thickness of the self-adhesive asphalt concrete is 15mm to 25mm and the maximum nominal grain diameter is 9.5mm, the mass content ratio of the asphalt binder to the mineral aggregate is 6 to 6.7:100,
the grading range of the mineral aggregate is as follows: the mass percentage of the sieve passing through the sieve hole with the diameter of 9.5mm is 95-100%, the mass percentage of the sieve passing through the sieve hole with the diameter of 4.75mm is 35-55%, the mass percentage of the sieve passing through the sieve hole with the diameter of 2.36mm is 25-42%, and the mass percentage of the sieve passing through the sieve hole with the diameter of 0.075mm is 7-14%.
6. The self-adhesive asphalt concrete according to claim 1, wherein when the pavement thickness of the self-adhesive asphalt concrete is 10mm to 20mm, and the maximum nominal grain diameter is 4.75mm, the mass content ratio of the asphalt binder to the mineral aggregate is 6.2 to 7.0:100,
the grading range of the mineral aggregate is as follows: the mass percentage of the sieve which passes through a sieve pore of 4.75mm is 80-100%, the mass percentage of the sieve which passes through a sieve pore of 2.36mm is 28-45%, and the mass percentage of the sieve which passes through a sieve pore of 0.075mm is 10-16%.
7. The self-bonding asphalt concrete according to claim 1, wherein the mineral aggregates comprise coarse aggregates, fine aggregates and fillers, the coarse aggregates being diabase or basalt aggregates with a nominal particle size of more than 2.36 mm; the fine aggregate is limestone aggregate with a nominal particle size of less than 2.36mm, and the filler is limestone mineral powder.
8. The process for the preparation of self-adhesive bituminous concrete according to any one of claims 1 to 7, characterized in that it comprises the steps of: heating the mineral aggregate to 170-190 ℃, adding the direct-throwing rubber powder asphalt modifier and the direct-throwing high-viscosity asphalt modifier according to the mass ratio, mixing, adding asphalt preheated to 135-160 ℃, mixing, and transporting and paving.
9. The process for constructing self-adhesive asphalt concrete according to any one of claims 1 to 7, which is applied to ultra-thin layer pavement construction, and comprises the following steps: the self-adhesive asphalt concrete is mechanically spread, compacted and rolled at the temperature of more than 150 ℃ for polishing.
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