CN114014589A - Asphalt surface function recovery mixture, preparation method thereof and pavement structure - Google Patents

Asphalt surface function recovery mixture, preparation method thereof and pavement structure Download PDF

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Publication number
CN114014589A
CN114014589A CN202111347229.9A CN202111347229A CN114014589A CN 114014589 A CN114014589 A CN 114014589A CN 202111347229 A CN202111347229 A CN 202111347229A CN 114014589 A CN114014589 A CN 114014589A
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asphalt
steel slag
surface function
function recovery
parts
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王捷
陈广辉
宋闽江
张苏龙
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Jiangsu Dongjiao Intelligent Control Technology Group Co ltd
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Jiangsu Dongjiao Intelligent Control Technology Group Co ltd
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    • 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
    • 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
    • C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B14/02—Granular materials, e.g. microballoons
    • C04B14/26—Carbonates
    • C04B14/28—Carbonates of calcium
    • 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
    • C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B14/02—Granular materials, e.g. microballoons
    • C04B14/32—Carbides; Nitrides; Borides ; Silicides
    • C04B14/322—Carbides
    • C04B14/324—Silicon carbide
    • 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
    • C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B18/04—Waste materials; Refuse
    • C04B18/14—Waste materials; Refuse from metallurgical processes
    • C04B18/141—Slags
    • C04B18/142—Steelmaking slags, converter slags
    • 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
    • C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
    • C04B20/10—Coating or impregnating
    • C04B20/1018—Coating or impregnating with organic materials
    • C04B20/1029—Macromolecular compounds
    • C04B20/1044—Bituminous materials
    • 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
    • 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
    • C04B2111/00241—Physical properties of the materials not provided for elsewhere in C04B2111/00
    • C04B2111/00362—Friction materials, e.g. used as brake linings, anti-skid materials
    • 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
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/20—Resistance against chemical, physical or biological attack
    • 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
    • C04B2111/20—Resistance against chemical, physical or biological attack
    • C04B2111/2038—Resistance against physical degradation
    • 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
    • C04B2111/20—Resistance against chemical, physical or biological attack
    • C04B2111/29—Frost-thaw resistance
    • 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

Abstract

The invention discloses an asphalt surface function recovery mixture, a preparation method thereof and a pavement structure, and belongs to the technical field of pavement materials. The mixture comprises, by weight, 75-85 parts of steel slag, 10-25 parts of carborundum, 0-5 parts of mineral powder, emulsified asphalt and water; wherein, the surface of the steel slag is wrapped with hot asphalt; the dosage of the emulsified asphalt is 8-12 wt% of the total amount of the steel slag, the carborundum and the mineral powder, and the dosage of the water is 4-5.5 wt% of the total amount of the steel slag, the carborundum and the mineral powder. The asphalt surface function recovery mixture has low cost, can improve the water damage resistance of the mixture, is favorable for reducing the attenuation rate of the skid resistance of the pavement, ensures the pavement strength and prolongs the service life of the pavement. The preparation method mainly comprises the following steps: mixing the above materials at a certain ratio. The pavement structure having the surface function recovery layer formed of the above mixture has high dynamic stability and good skid resistance durability.

Description

Asphalt surface function recovery mixture, preparation method thereof and pavement structure
Technical Field
The invention relates to the technical field of pavement materials, in particular to an asphalt surface function recovery mixture, a preparation method thereof and a pavement structure.
Background
With the increase of the operation time of the highway, the damage of surface abrasion and slight crack appears on partial pavement, and the anti-skid performance and the service life of the pavement are influenced.
Conventional curing methods include slurry seal, micro-surfacing, ultra-thin wearing layers, etc.
Wherein, the micro-surfacing is provided with stone chips or sand with certain gradation, fillers (cement, lime, fly ash, stone powder and the like), polymer modified emulsified asphalt, an external additive and water which are mixed into a flowing mixture according to a certain proportion and then are uniformly spread on a 5-10mm sealing layer on the pavement.
The ultra-thin wearing layer is arranged by paving the graded modified hot asphalt mixture with the thickness of 15-25mm on a polymer modified emulsified asphalt adhesive layer film and then using special spraying type paving equipment for construction.
However, the conventional curing methods described above have at least the following problems:
the service life of the slurry seal and the micro-surfacing is usually 2-3 years, the durability is poor, and the driving comfort is low; the ultrathin wearing layer has great influence on the environment, high technological requirement, high construction cost and great construction quality fluctuation.
In view of this, the invention is particularly proposed.
Disclosure of Invention
One of the objects of the present invention is to provide an asphalt surface function recovery mixture which can improve the anti-skid durability of a road surface, and which is low in construction cost and small in construction quality fluctuation.
The second purpose of the invention is to provide a preparation method of the asphalt surface function recovery mixture.
The invention also aims to provide a surface function recovery layer formed by the asphalt surface function recovery mixture.
The application can be realized as follows:
in a first aspect, the application provides an asphalt surface function recovery mixture, which comprises, by weight, 75-85 parts of steel slag, 10-25 parts of carborundum, 0-5 parts of mineral powder, emulsified asphalt and water;
wherein, the surface of the steel slag is wrapped with hot asphalt;
the dosage of the emulsified asphalt is 8-12 wt% of the total amount of the steel slag, the carborundum and the mineral powder, and the dosage of the water is 4-5.5 wt% of the total amount of the steel slag, the carborundum and the mineral powder.
In an alternative embodiment, the steel slag has a particle size of 5 to 10 mm.
In an alternative embodiment, the steel slag comprises converter steel slag or electric furnace steel slag, which is composed of silicate.
In an alternative embodiment, the temperature of the hot asphalt is 155-165 ℃.
In alternative embodiments, the hot asphalt is 70# hot asphalt, 50# hot asphalt, or 90# hot asphalt, more preferably 70# hot asphalt.
In an alternative embodiment, the mass of the hot asphalt coated on the surface of the steel slag is 1-3% of the mass of the steel slag.
In an alternative embodiment, the carborundum has a particle size of 3 to 5 mm.
In an alternative embodiment, the ore fines are made of limestone.
In an alternative embodiment, the emulsified asphalt is an SBR emulsified asphalt or an SBS modified emulsified asphalt.
In an alternative embodiment, the grading of fines and aggregates in the asphalt surface function-restoring blend satisfies:
the passing rate of 9.5mm sieve pores is 100%, the passing rate of 7.6mm sieve pores is 90-100%, the passing rate of 4.75mm sieve pores is 70-90%, the passing rate of 2.36mm sieve pores is 45-70%, the passing rate of 1.18mm sieve pores is 28-50%, the passing rate of 0.6mm sieve pores is 19-34%, the passing rate of 0.3mm sieve pores is 12-25%, the passing rate of 0.15mm sieve pores is 7-18%, and the passing rate of 0.075mm sieve pores is 5-15%.
In a second aspect, the present application provides a method of preparing an asphalt surface function-restoring mixture, as in any one of the preceding embodiments, comprising the steps of: mixing steel slag, carborundum, mineral powder, emulsified asphalt and water according to the proportion.
In an alternative embodiment, the steel slag, silicon carbide and mineral powder are mixed first and then mixed with the emulsified asphalt and water.
In an alternative embodiment, the mixing process is carried out at a temperature of 10-35 ℃.
In a third aspect, the present application provides a pavement structure comprising a surface function recovery layer formed of the asphalt surface function recovery mixture of any one of the preceding embodiments.
In an alternative embodiment, the surface function recovery layer has a thickness of 8-12 mm.
In an optional embodiment, the surface function recovery layer is formed by rolling the paved asphalt surface function recovery mixture for 2-3 times by adopting a light double-steel-wheel road roller with the working quality of 2-5 t.
In an alternative embodiment, the pavement further comprises an adhesive layer positioned on the upper surface of the basic pavement, and the surface function recovery layer is arranged on the upper surface of the adhesive layer.
In an alternative embodiment, the thickness of the adhesive layer is 0.5 to 1 mm.
In an alternative embodiment, the adhesive layer is made of epoxy resin, and the spreading amount of the epoxy resin is 0.5-1.5kg/m2。
In an alternative embodiment, the pavement structure further includes a seal layer on the upper surface of the surface function recovery layer.
In an alternative embodiment, the thickness of the seal layer is > 0 and not more than 1 mm.
In an alternative embodiment, the material of the seal layer is modified emulsified asphalt, and the spreading amount of the modified emulsified asphalt is 1-2kg/m2。
The beneficial effect of this application includes:
according to the pavement aggregate framework, the aggregate framework is formed by matching the steel slag and the carborundum, so that on one hand, the attenuation rate of the skid resistance of the pavement can be reduced, the strength of the compacted pavement can be ensured, and on the other hand, the wear resistance, the breaking strength, the corrosion resistance, the water damage resistance, the freezing resistance, the stability and the durability of the pavement can be improved; in addition, the method is favorable for expanding the utilization range of the steel slag and improving the utilization rate of the steel slag. The mineral powder is added, so that the compressive strength and durability of the pavement are further improved. The surface of the steel slag is wrapped by hot asphalt, and after being mixed with carborundum, mineral powder and emulsified asphalt, the water damage resistance of the mixture can be improved. The preparation method is simple, easy to operate, low in construction cost and small in construction quality fluctuation.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic structural diagram of a pavement structure provided in the present application.
Icon: 1-a base pavement; 2-sticking layer; 3-surface function recovery layer; 4-sealing layer.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
The asphalt surface function recovery mixture provided by the present application, the preparation method thereof, and the pavement structure are specifically described below.
The application provides an asphalt surface function recovery mixture, which comprises, by weight, 75-85 parts of steel slag, 10-25 parts of carborundum, 0-5 parts of mineral powder, emulsified asphalt and water; the dosage of the emulsified asphalt is 8-12 wt% of the total amount of the steel slag, the carborundum and the mineral powder, and the dosage of the water is 4-5.5 wt% of the total amount of the steel slag, the carborundum and the mineral powder.
The steel slag may be used in an amount of 75 parts, 76 parts, 77 parts, 78 parts, 79 parts, 80 parts, 81 parts, 82 parts, 83 parts, 84 parts or 85 parts, or may be used in any other value within a range of 75 to 85 parts.
The amount of corundum used may be 10 parts, 12 parts, 15 parts, 18 parts, 20 parts, 22 parts or 25 parts, or any other value within the range of 10 to 25 parts.
The amount of the mineral powder may be 0 part, 0.5 part, 1 part, 1.5 parts, 2 parts, 2.5 parts, 3 parts, 3.5 parts, 4 parts, 4.5 parts, 5 parts, or the like, or may be any other value within the range of 0 to 5 parts. When the using amount of the mineral powder is 0 part, the asphalt surface function recovery mixture does not contain the mineral powder.
The amount of the emulsified asphalt may be 8 wt%, 8.5 wt%, 9 wt%, 9.5 wt%, 10 wt%, 10.5 wt%, 11 wt%, 11.5 wt%, 12 wt%, or the like, based on the total amount of the steel slag, the corundum, and the ore powder, or may be any other value within the range of 8 to 12 wt%.
The amount of water may be 4 wt%, 4.5 wt%, 5 wt% or 5.5 wt% of the total amount of the steel slag, the carborundum and the ore powder, etc., or may be any other value within the range of 4 to 5.5 wt%.
In the application, the surface of the steel slag is wrapped with hot asphalt.
In alternative embodiments, the temperature of the hot asphalt can be 155-165 ℃, such as 155 ℃, 158 ℃, 160 ℃, 162 ℃ or 165 ℃, or any other value within the range of 155-165 ℃. The above-mentioned hot asphalt may be, for example, 70# hot asphalt, 50# hot asphalt or 90# hot asphalt, preferably 70# hot asphalt.
The mass of the hot asphalt coated on the surface of the steel slag can be 1-3% of the mass of the steel slag, such as 1%, 1.5%, 2%, 2.5% or 3%, and can also be any other value within the range of 1-3%.
It is worth to say that the water damage resistance of the steel slag can be improved by pre-wrapping the hot asphalt. However, when the amount of hot asphalt coated on the surface of the steel slag is higher than 3%, the cost of the asphalt mixture is easily increased, and the oil bleeding disease is easily caused in the later period.
In an alternative embodiment, the steel slag may have a particle size of 5 to 10 mm. When the grain size of the steel slag is less than 5mm, the wear resistance of the corresponding pavement is easy to be lower, and when the grain size of the steel slag is more than 10mm, the stability of grading is directly influenced.
Specifically, the steel slag may be converter steel slag or electric furnace steel slag containing silicate as a main component.
In the application, the steel slag is mainly used as a coarse aggregate component in the asphalt surface function recovery mixture, so that the utilization range of the steel slag can be enlarged, the utilization rate of the steel slag is improved, and the wear resistance, the breaking strength, the corrosion resistance, the water damage resistance, the freezing resistance, the stability and the durability of a corresponding pavement can be improved.
In the present application, the grain size of the corundum may be 3 to 5 mm. The carborundum is mainly used as a fine aggregate component in the asphalt surface function recovery mixture and has the function of improving the anti-skid capability of the pavement.
The mineral powder is mainly used as a filler in the asphalt surface function recovery mixture and is mainly prepared from limestone. The concrete can be filled in the gaps of cement particles to form the closest packing, and is beneficial to improving the compressive strength and durability of the pavement.
The emulsified asphalt can be SBR emulsified asphalt or SBS modified emulsified asphalt, and the road surface corresponding to the emulsified asphalt has high temperature resistance and rutting resistance and low abrasion loss.
On the one hand, the aggregate framework is formed by matching the steel slag and the carborundum, so that the attenuation rate of the skid resistance of the pavement can be reduced, the strength of the compacted pavement can be ensured, and the wear resistance, the breaking strength, the corrosion resistance, the water damage resistance, the frost resistance, the stability and the durability of the pavement can be improved; in addition, the method is favorable for expanding the utilization range of the steel slag and improving the utilization rate of the steel slag. The mineral powder is added, so that the compressive strength and durability of the pavement are further improved. The surface of the steel slag is wrapped by hot asphalt, and after being mixed with carborundum, mineral powder and emulsified asphalt, the water damage resistance of the mixture can be improved.
In an alternative embodiment, the above-mentioned gradation of the mineral fines and aggregates in the asphalt surface function-restoring mixture satisfies:
the passing rate of 9.5mm sieve pores is 100%, the passing rate of 7.6mm sieve pores is 90-100%, the passing rate of 4.75mm sieve pores is 70-90%, the passing rate of 2.36mm sieve pores is 45-70%, the passing rate of 1.18mm sieve pores is 28-50%, the passing rate of 0.6mm sieve pores is 19-34%, the passing rate of 0.3mm sieve pores is 12-25%, the passing rate of 0.15mm sieve pores is 7-18%, and the passing rate of 0.075mm sieve pores is 5-15%.
The sieve corresponding to the sieve pore can be a square-pore sieve, and the gradation can refer to the following table:
Figure BDA0003354640470000071
this application has increased 7.6 mm's control sieve mesh in the gradation, is favorable to improving the stability of mineral aggregate gradation, and then improves road surface quality.
Correspondingly, the application also provides a preparation method of the asphalt surface function recovery mixture, which comprises the following steps: mixing steel slag, carborundum, mineral powder, emulsified asphalt and water according to the proportion.
In an alternative embodiment, the steel slag, silicon carbide and mineral powder are mixed first and then mixed with the emulsified asphalt and water.
In particular, reference may be made to the following steps:
A. pre-wrapping steel slag: pouring the steel slag into an asphalt mixing station, adding 1-3% of hot asphalt by mass fraction, and mixing to obtain the steel slag with the surface coated with the asphalt;
B. preparing mineral powder and aggregate: uniformly mixing the steel slag with the surface coated with the asphalt, the carborundum and the mineral powder by a batching machine according to the design gradation;
C. mixing the mixture: the mixture of the mineral powder and the aggregate is mixed with the emulsified asphalt.
It is worth to be noted that all the mixing processes are carried out at 10-35 ℃, namely the mixing processes in the application are cold mixing, and compared with the hot mixing mode generally adopted at present, the construction energy consumption and carbon emission can be effectively reduced.
Further, the present application also provides a pavement structure, as shown in fig. 1, having a surface function recovery layer 3 formed of the above asphalt surface function recovery mixture.
The thickness of the surface function recovery layer 3 may, by reference, be 8-12mm, such as 8mm, 9mm, 10mm, 11mm or 12mm, etc., and may also be any other value in the range of 8-12 mm.
The surface function recovery layer 3 can be formed by rolling the paved asphalt surface function recovery mixture for 2-3 times by a light double-steel-wheel road roller with the working quality of 2-5 t.
Further, the pavement structure further comprises an adhesive layer 2 positioned on the upper surface of the basic pavement 1, and the surface function recovery layer 3 is arranged on the upper surface of the adhesive layer 2.
The thickness of the adhesive layer 2 may be, for example, 0.5-1mm, such as 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm or 1mm, and may be any other value within the range of 0.5-1 mm.
The material of the adhesive layer 2 can be epoxy resin, and the spreading amount of the epoxy resin can be 0.5-1.5kg/m2E.g. 0.5kg/m2、0.8kg/m2、1kg/m2、1.2kg/m2Or 1.5kg/m2Etc., may be 0.5 to 1.5kg/m2Any other value within the range.
Further, the above-mentioned pavement structure further includes a seal layer 4 on the upper surface of the surface function recovery layer 3.
The thickness of the seal layer 4 is, by reference, greater than 0 and not more than 1mm, such as 0.2mm, 0.5mm, 0.8mm or 1mm, and may be any other value within the range of greater than 0 and not more than 1 mm.
The material of the seal layer 4 can be modified emulsified asphalt, and the spreading amount of the modified emulsified asphalt can be 1-2kg/m2E.g. 1kg/m2、1.2kg/m2、1.5kg/m2、1.8kg/m2Or 2kg/m2Etc., may be 1 to 2kg/m2Any other value within the range.
The features and properties of the present invention are described in further detail below with reference to examples.
Example 1
The present embodiment provides a pavement structure, which comprises a basic pavement 1, an adhesive layer 2, a surface function recovery layer 3 and a sealing layer 4 from bottom to top in sequence.
Wherein the adhesive layer 2 is an epoxy adhesive layer with a thickness of 0.5mm, and the spreading amount of the epoxy resin is 1kg/m2. The seal layer 4 is a modified emulsified asphalt seal layer with a thickness of 0.5mm, and the spreading amount of the modified emulsified asphalt is 1.5kg/m2. The surface function recovery layer 3 is formed by rolling the paved asphalt surface function recovery mixture for 3 times by a light double-steel-wheel road roller with the working mass of 5 t.
The asphalt surface function recovery mixture comprises, by weight, 75 parts of steel slag, 22 parts of carborundum, 3 parts of mineral powder, emulsified asphalt and water. Wherein, the dosage of the emulsified asphalt is 10 wt% (namely 10 parts) of the total amount of the steel slag, the carborundum and the mineral powder, and the dosage of the water is 4.5 wt% (namely 4.5 parts) of the total amount of the steel slag, the carborundum and the mineral powder.
The surface of the steel slag is wrapped with No. 70 hot asphalt with the temperature of 160 ℃, and the mass of the hot asphalt wrapped on the surface of the steel slag is 2 percent of the mass of the steel slag. The steel slag has a grain size of 5-10mm, and the main component of the steel slag is converter steel slag consisting of silicate.
The grain diameter of the carborundum is 3-5 mm. The mineral powder is made from limestone. The emulsified asphalt is SBS modified emulsified asphalt.
The grading of the mineral powder and the aggregate in the asphalt surface function recovery mixture meets the following requirements:
Figure BDA0003354640470000091
the preparation method of the asphalt surface function recovery mixture comprises the following steps:
A. pre-wrapping steel slag: pouring the steel slag into an asphalt mixing station, adding the No. 70 hot asphalt according to the proportion, and mixing to obtain the steel slag with the asphalt coated on the surface;
B. preparing mineral powder and aggregate: uniformly mixing the steel slag with the surface coated with the asphalt, the carborundum and the mineral powder by a batching machine according to the design gradation;
C. mixing the mixture: the mixture of the mineral powder and the aggregate is mixed with the emulsified asphalt.
All the mixing processes are carried out at 10-35 ℃.
Example 2
This example differs from example 1 in that: the asphalt surface function recovery mixture comprises 80 parts of steel slag, 17 parts of carborundum, 3 parts of mineral powder, SBS modified emulsified asphalt and water. Wherein, the dosage of the SBS modified emulsified asphalt is 10 wt% (namely 10 parts) of the total amount of the steel slag, the carborundum and the mineral powder, and the dosage of the water is 4.5 wt% (namely 4.5 parts) of the total amount of the steel slag, the carborundum and the mineral powder.
Example 3
This example differs from example 1 in that: the asphalt surface function recovery mixture comprises 85 parts of steel slag, 12 parts of carborundum, 3 parts of mineral powder, SBS modified emulsified asphalt and water. Wherein, the dosage of the SBS modified emulsified asphalt is 10 wt% (namely 10 parts) of the total amount of the steel slag, the carborundum and the mineral powder, and the dosage of the water is 4.5 wt% (namely 4.5 parts) of the total amount of the steel slag, the carborundum and the mineral powder.
Example 4
This example differs from example 2 in that: the asphalt surface function recovery mixture comprises 75 parts of steel slag, 25 parts of carborundum, SBS modified emulsified asphalt and water. Wherein, the dosage of the SBS modified emulsified asphalt is 10 wt% (namely 10 parts) of the total amount of the steel slag and the carborundum, and the dosage of the water is 4.5 wt% (namely 4.5 parts) of the total amount of the steel slag and the carborundum.
Example 5
This example differs from example 2 in that: the asphalt surface function recovery mixture comprises 84 parts of steel slag, 11 parts of carborundum, 5 parts of mineral powder, SBS modified emulsified asphalt and water. Wherein, the dosage of the SBS modified emulsified asphalt is 10 wt% (namely 10 parts) of the total amount of the steel slag, the carborundum and the mineral powder, and the dosage of the water is 4.5 wt% (namely 4.5 parts) of the total amount of the steel slag, the carborundum and the mineral powder.
Example 6
This example differs from example 2 in that: the surface of the steel slag is wrapped with No. 70 hot asphalt with the temperature of 155 ℃, and the mass of the hot asphalt wrapped on the surface of the steel slag is 1 percent of the mass of the steel slag. The main component of the steel slag is electric furnace steel slag consisting of silicate.
The grain diameter of the carborundum is 3-5 mm. The mineral powder is made from limestone. The emulsified asphalt is SBR emulsified asphalt.
Example 7
This example differs from example 2 in that: the surface of the steel slag is wrapped with No. 70 hot asphalt with the temperature of 165 ℃, and the mass of the hot asphalt wrapped on the surface of the steel slag is 3 percent of the mass of the steel slag.
Example 8
This example differs from example 2 in that: the adhesive layer 2 is an epoxy adhesive layer with a thickness of 0.8mm, and the spreading amount of the epoxy resin is 0.5kg/m2. The seal layer 4 is a modified emulsified asphalt seal layer with a thickness of 0.1mm, and the spraying amount of the modified emulsified asphalt is 1kg/m2. The surface function recovery layer 3 is formed by rolling the paved asphalt surface function recovery mixture for 2 times by a light double-steel-wheel road roller with the working quality of 2 t.
Example 9
This example differs from example 2 in that: the adhesive layer 2 is an epoxy adhesive layer with a thickness of 1mm, and the spreading amount of the epoxy resin is 1.5kg/m2. The seal layer 4 is a modified emulsified asphalt seal layer with the thickness of 1mm, and the spraying amount of the modified emulsified asphalt is 2kg/m2. The surface function recovery layer 3 is formed by rolling the paved asphalt surface function recovery mixture for 3 times by a light double-steel-wheel road roller with the working quality of 3 t.
Comparative example 1
This example differs from example 2 in that: the asphalt surface function recovery mixture comprises 80 parts of basalt, 17 parts of carborundum, 3 parts of mineral powder, SBS modified emulsified asphalt and water. Wherein the dosage of the emulsified asphalt is 10 wt% (namely 10 parts) of the total amount of the basalt, the carborundum and the mineral powder, and the dosage of the water is 4.5 wt% (namely 4.5 parts) of the total amount of the steel slag, the carborundum and the mineral powder.
Comparative example 2
This example differs from example 2 in that: the asphalt surface function recovery mixture comprises 80 parts of steel slag, 17 parts of limestone, 3 parts of mineral powder, SBS modified emulsified asphalt and water. Wherein the dosage of the emulsified asphalt is 10 wt% (namely 10 parts) of the total amount of the steel slag, the limestone and the mineral powder, and the dosage of the water is 4.5 wt% (namely 4.5 parts) of the total amount of the steel slag, the limestone and the mineral powder.
Comparative example 3
This example differs from example 2 in that: the asphalt surface function recovery mixture comprises 80 parts of basalt, 17 parts of limestone, 3 parts of mineral powder, SBS modified emulsified asphalt and water. Wherein the dosage of the emulsified asphalt is 10 wt% (namely 10 parts) of the total amount of the basalt, the limestone and the mineral powder, and the dosage of the water is 4.5 wt% (namely 4.5 parts) of the total amount of the basalt, the limestone and the mineral powder.
Comparative example 4
This example differs from example 2 in that: the surface of the steel slag is not wrapped with hot asphalt.
Comparative example 5
This example differs from example 2 in that: the mass of the hot asphalt coated on the surface of the steel slag is 5 percent of the mass of the steel slag.
Comparative example 6
This example differs from example 2 in that: the grain size of the steel slag is less than 5 mm.
Comparative example 7
This example differs from example 2 in that: the grain size of the steel slag is larger than 10 mm.
The asphalt surface function-restoring mixes of the above examples 1 to 3 and comparative examples 1 to 3 were composed as shown in Table 1.
TABLE 1 composition table
Figure BDA0003354640470000121
Test examples
The asphalt surface function recovery mixtures obtained in the above examples 1 to 9 and comparative examples 1 to 7 were subjected to the following performance tests, wherein the dynamic stability was performed with reference to an asphalt mixture rut test (T0719-, the wet wheel abrasion loss is carried out according to the slurry mixture wet wheel abrasion test (T0752-. The results are shown in Table 2.
Table 2 results of performance testing
Figure BDA0003354640470000131
As can be seen from the results of comparative examples 1 to 3: with the increase of the steel slag mixing amount, the dynamic stability is increased, and other indexes are reduced to a certain extent, but all meet the standard requirements, and the effect of the embodiment 2 is considered comprehensively.
As can be seen by comparing the results of example 2 with examples 4-9: the overall performance corresponding to example 2 is superior to examples 4-9, demonstrating that the best performing asphalt surface function recovery mix can be obtained under the conditions of example 2.
As can be seen from the results of comparative example 2 and comparative examples 1 to 3: example 2 corresponds to overall performance superior to the other types of compounds provided in comparative examples 1-3 and possesses good slip durability.
As can be seen by comparing the results of example 2 with comparative examples 4 to 7: under the condition that the hot asphalt is not coated on the surface of the steel slag or the coating amount of the hot asphalt exceeds 3 percent or the particle size of the steel slag exceeds 5-10mm, the obtained asphalt surface function recovery mixture is obviously worse than that of the example 2.
To sum up, the asphalt surface function recovery mixture cost that this application provided is lower, not only can improve the water damage resistance performance of mixture, but also is favorable to reducing the decay rate of the skid resistance performance on road surface, ensures road surface intensity, extension road surface life. The preparation method is simple and easy to operate. The pavement structure having the surface function recovery layer formed of the above mixture has high dynamic stability and good skid resistance durability.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. The asphalt surface function recovery mixture is characterized by comprising, by weight, 75-85 parts of steel slag, 10-25 parts of carborundum, 0-5 parts of mineral powder, emulsified asphalt and water;
wherein, the surface of the steel slag is wrapped with hot asphalt;
the dosage of the emulsified asphalt is 8-12 wt% of the total amount of the steel slag, the carborundum and the mineral powder, and the dosage of the water is 4-5.5 wt% of the total amount of the steel slag, the carborundum and the mineral powder.
2. The asphalt surface function-recovering mixture according to claim 1, wherein the steel slag has a particle size of 5 to 10 mm;
preferably, the steel slag mainly comprises converter steel slag or electric furnace steel slag consisting of silicate;
preferably, the temperature of the hot asphalt is 155-165 ℃;
preferably, the hot asphalt is 70# hot asphalt, 50# hot asphalt or 90# hot asphalt, more preferably 70# hot asphalt;
preferably, the mass of the hot asphalt coated on the surface of the steel slag is 1-3% of the mass of the steel slag.
3. The asphalt surface function-restoring mixture according to claim 1, wherein the corundum has a particle size of 3 to 5 mm.
4. The asphalt surface function-restoring mixture according to claim 1, wherein the ore powder is made of limestone.
5. The asphalt surface function recovery mixture according to claim 1, wherein the emulsified asphalt is SBR emulsified asphalt or SBS modified emulsified asphalt.
6. An asphalt surface function-restoring mixture according to any one of claims 1 to 5, wherein the gradation of mineral fines and aggregates in the asphalt surface function-restoring mixture satisfies:
the passing rate of 9.5mm sieve pores is 100%, the passing rate of 7.6mm sieve pores is 90-100%, the passing rate of 4.75mm sieve pores is 70-90%, the passing rate of 2.36mm sieve pores is 45-70%, the passing rate of 1.18mm sieve pores is 28-50%, the passing rate of 0.6mm sieve pores is 19-34%, the passing rate of 0.3mm sieve pores is 12-25%, the passing rate of 0.15mm sieve pores is 7-18%, and the passing rate of 0.075mm sieve pores is 5-15%.
7. The method for preparing a bituminous surface-recovering mixture according to any one of claims 1 to 6, characterized in that it comprises the following steps: mixing the steel slag, the carborundum, the mineral powder, the emulsified asphalt and water according to a ratio;
preferably, the steel slag, the carborundum and the mineral powder are mixed firstly and then are mixed with the emulsified asphalt and water;
preferably, the mixing process is carried out at a temperature of 10-35 ℃.
8. A pavement structure characterized by comprising a surface function recovery layer formed of the asphalt surface function recovery mixture according to any one of claims 1 to 6;
preferably, the surface function recovery layer has a thickness of 8 to 12 mm.
9. A pavement structure as claimed in claim 8, wherein said surface function recovery layer is formed by rolling said asphalt surface function recovery mixture after paving for 2-3 times using a light-duty two-drum roller having a working mass of 2-5 t.
10. The pavement structure according to claim 8, further comprising an adhesive layer on an upper surface of the base pavement, wherein the surface function recovery layer is provided on an upper surface of the adhesive layer;
preferably, the thickness of the adhesive layer is 0.5-1 mm;
preferably, the material of the adhesive layer is epoxy resin, and the spreading amount of the epoxy resin is 0.5-1.5kg/m2；
Preferably, the pavement structure further comprises a seal layer located on an upper surface of the surface function recovery layer;
preferably, the thickness of the seal layer is more than 0 and not more than 1 mm;
preferably, the material of the seal coat is modified emulsified asphalt, and the spreading amount of the modified emulsified asphalt is 1-2kg/m2。
CN202111347229.9A 2021-11-15 2021-11-15 Asphalt surface function recovery mixture, preparation method thereof and pavement structure Pending CN114014589A (en)

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