CN113213816A - Low-activity steel slag asphalt mixture and preparation method thereof - Google Patents
Low-activity steel slag asphalt mixture and preparation method thereof Download PDFInfo
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- CN113213816A CN113213816A CN202110561242.8A CN202110561242A CN113213816A CN 113213816 A CN113213816 A CN 113213816A CN 202110561242 A CN202110561242 A CN 202110561242A CN 113213816 A CN113213816 A CN 113213816A
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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
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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
- 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
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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
- 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
- C04B20/1055—Coating or impregnating with inorganic materials
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00008—Obtaining or using nanotechnology related materials
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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
- 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
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- 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
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- Chemical & Material Sciences (AREA)
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- Structural Engineering (AREA)
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- Inorganic Chemistry (AREA)
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Abstract
The application relates to the technical field of steel slag recycling, and particularly discloses a low-activity steel slag asphalt mixture and a preparation method thereof. The low-activity steel slag asphalt mixture is prepared from the following raw materials in parts by weight: 720-940 parts of modified steel slag: 140-170 parts of asphalt: 41-55 parts of modified steel slag, wherein the modified steel slag is prepared from cooked steel slag, thermoplastic plastics and nano silicon carbide powder, and the weight ratio of the cooked steel slag, the thermoplastic plastics and the nano silicon carbide powder is 80-120: 20-30: 2-3, wherein the steamed steel slag is prepared by steaming steel slag through deionized water; the preparation method comprises the following steps: s1, stirring and mixing the aggregate and the modified steel slag uniformly to prepare an intermediate material; and S2, mixing the intermediate material prepared in the S1 and asphalt uniformly in a hot mixing manner to obtain a mixture. The low-activity steel slag asphalt mixture has the advantages of improving the water stability of the mixture and reducing pavement cracking; in addition, the preparation method has the advantages of simple preparation and easy obtaining of products.
Description
Technical Field
The application relates to the technical field of steel slag recycling, in particular to a low-activity steel slag asphalt mixture and a preparation method thereof.
Background
The steel slag is an aggregate of impurities generated in the steel making process, a large amount of slagging materials are added in the steel making process in order to remove harmful substances in the molten steel, limestone is used as a basic slagging material in a large amount in the steel making process, the limestone generates calcium oxide at high temperature, the calcium oxide is wrapped by generated minerals such as vulcanized dicarbon and the like, two phases which are not mutually soluble are separated from molten iron, the impurities with lower density at the upper part are discharged, cooled, solidified and crushed, and the steel slag with porous holes on the surface is obtained.
A large amount of steel slag is produced in China every year, the stacking of the large amount of steel slag occupies land resources and causes environmental pollution, and the steel slag is used for producing steel slag asphalt mixture to be used for paving steel slag asphalt concrete pavements, so that the environmental pollution and the resource waste are reduced.
The inventor believes that the pavement paved by using the steel slag asphalt mixture is easy to crack after being subjected to water infiltration erosion, thereby causing the quality of the steel slag asphalt concrete pavement to be reduced.
Disclosure of Invention
In order to improve the water stability of the steel slag asphalt mixture and improve the quality of a steel slag asphalt concrete pavement, the application provides the low-activity steel slag asphalt mixture and the preparation method thereof.
In a first aspect, the application provides a low-activity steel slag asphalt mixture, which adopts the following technical scheme:
a low-activity steel slag asphalt mixture is prepared from the following raw materials in parts by weight, 720-940 parts of aggregate and modified steel slag: 140-170 parts of asphalt: 41-55 parts of modified steel slag, wherein the modified steel slag is prepared from cooked steel slag, thermoplastic plastics and nano silicon carbide powder, and the weight ratio of the cooked steel slag, the thermoplastic plastics and the nano silicon carbide powder is 80-120: 20-30: 2-3, the cooking steel slag is obtained by cooking steel slag through deionized water, and the thermoplastic plastic is mixed with the cooking steel slag and the nano silicon carbide powder after being melted.
By adopting the technical scheme, the steel slag is steamed and boiled by deionized water to accelerate the hydration reaction rate, so that calcium oxide is converted into calcium hydroxide, then the steamed and boiled steel slag is mixed with the thermoplastic plastic and the nano silicon carbide powder, the thermoplastic plastic carries the nano silicon carbide powder to enter the holes on the surface of the steel slag, and the nano silicon carbide powder promotes the generation of sodium hydroxide crystals and the crystallization of the thermoplastic plastic, so that the surface of the steel slag is coated and the holes are closed, and the conversion of the calcium hydroxide into calcium carbonate is effectively reduced; when the modified steel slag, the aggregate and the asphalt are used for preparing the mixture, the thermoplastic plastics are melted and mixed with the asphalt to enter the holes on the surface of the cooked steel slag, so that the asphalt is combined with the cooked steel slag, when a concrete pavement is laid, the waterproof performance of the asphalt mixed with the thermoplastic plastics is improved, water entering the concrete pavement is reduced, the cracking condition of the concrete pavement is reduced, and the steel slag is hydrated in advance, so that free calcium oxide on the steel slag is effectively reduced, and the cracking condition of the concrete pavement is further reduced.
Preferably, the preparation method of the modified steel slag comprises the following steps:
s1, firstly, cooking the steel slag by using deionized water, and then fishing out the steel slag from the deionized water and draining to obtain the cooked steel slag;
s2, firstly, melting the thermoplastic plastics, adding the nano silicon carbide powder, uniformly stirring, then placing the cooking steel slag into the molten thermoplastic plastics for soaking, fishing out the cooking steel slag from the molten thermoplastic plastics, and cooling to normal temperature to obtain the modified steel slag.
By adopting the technical scheme, the steel slag is cooked by using the deionized water, so that the hydration rate of the steel slag is accelerated, and the cooked steel slag can effectively reduce the amount of calcium oxide on the steel slag, so that the condition that a concrete pavement is cracked due to the influence of the hydration reaction of the steel slag is effectively reduced; the thermoplastic plastic seals the surface and holes of the cooking steel slag, so that the condition that calcium hydroxide is converted into calcium carbonate due to the fact that air erodes the cooking steel slag is reduced, the nanometer silicon carbide powder promotes the generation of sodium hydroxide crystals and promotes the crystallization of thermoplastic plastic, the condition that sodium hydroxide is converted into calcium carbonate due to the fact that air is in contact with the cooking steel slag is further reduced, and therefore the influence of air erosion on the strength of the cooking steel slag is reduced.
Preferably, the thermoplastic plastic is one of PE plastic, PC plastic or POM plastic, preferably PE plastic.
By adopting the technical scheme, the thermoplastic plastics are firstly melted to protect the steamed steel slag, and the thermoplastic plastics improve the waterproof performance of the asphalt during the second melting, so that the water entering the concrete pavement is effectively reduced, the water stability of the mixture is improved, and the cracking condition of the concrete pavement is reduced.
Preferably, the thermoplastic is dried before melting.
By adopting the technical scheme, the water in the thermoplastic plastic is reduced, so that the water in the mixture is reduced, and the condition of asphalt mixture overflow occurs in the subsequent heating process.
Preferably, the steel slag in the S1 is drained in a nitrogen atmosphere.
By adopting the technical scheme, the corrosion of carbon dioxide to the steel slag is effectively reduced, so that the condition that calcium hydroxide is converted into calcium carbonate is effectively reduced.
Preferably, the steel slag steamed in S2 is fished out from the molten thermoplastic and then cooled to normal temperature in a nitrogen atmosphere.
By adopting the technical scheme, the corrosion of carbon dioxide to the steel slag is effectively reduced, so that the condition that calcium hydroxide is converted into calcium carbonate is effectively reduced.
Preferably, the aggregate comprises crushed stone, river sand and stone chips, and the mass ratio of the crushed stone to the river sand to the stone chips is 320-400: 70-130: 330-410, the particle size of the broken stone is 9.5-16 mm, the particle size of the river sand is 2.36-4.75 mm, the particle size of the stone chips is 0-2.36 mm, and the particle size of the steamed steel slag is 4.75-9.5 mm.
By adopting the technical scheme, the broken stone, the modified steel slag, the river sand and the stone chips are graded and mixed, so that the stability of the asphalt mixture is improved, and the strength of the concrete pavement is further improved.
In a second aspect, the application provides a preparation method of a low-activity steel slag asphalt mixture, which adopts the following technical scheme:
a preparation method of a low-activity steel slag asphalt mixture comprises the following steps:
s1, stirring and mixing the aggregate and the modified steel slag uniformly to prepare an intermediate material;
and S2, mixing the intermediate material prepared in the S1 and asphalt uniformly in a hot mixing manner to obtain a mixture.
By adopting the technical scheme, the water stability of the prepared steel slag and asphalt mixture is improved, the cracking condition of the paved concrete pavement is effectively reduced, the method is simple, and the product is easy to obtain.
In summary, the present application has the following beneficial effects:
1. according to the method, the steel slag is subjected to hydration treatment in advance, so that calcium oxide is converted into calcium hydroxide, the hydration activity of the steel slag is reduced, the water stability of the mixture is improved, and the cracking condition of the concrete pavement is reduced.
2. In the preparation process of the steel slag of cooking in this application, divide into through setting up nitrogen gas and protect the steel slag of cooking, reduce the carbon dioxide and corrode the condition that the steel slag of cooking makes calcium hydroxide change calcium carbonate into, reduce the condition that steel slag of cooking intensity descends.
3. The nano silicon carbide promotes the calcium hydroxide crystals to generate and improve the strength of the cooking steel slag, simultaneously promotes the crystallization of thermoplastic plastics, and reduces the erosion of carbon dioxide to the cooking steel slag by accelerating the solidification speed of the thermoplastic plastics.
Detailed Description
The particle size of the broken stone is 9.5-16 mm, and the broken stone is purchased from Hebei Zexu building materials science and technology development Limited company;
the steel slag has the grain diameter of 4.75-9.5 mm and is from Laiwu Steel group Limited company;
the river sand has the grain diameter of 2.36-4.75 mm and is purchased from Hebei Zexu building materials science and technology development Limited company;
the particle size of the stone chips is 0-2.36 mm, and the stone chips are purchased from Hebei Zexu building materials science and technology development Limited company;
the thermoplastic plastic is PE plastic and is purchased from a Dahua plastic processing factory in Jinan;
the nano silicon carbide powder is purchased from Hebei Yirui alloy welding materials, Inc., and has the product number of KR-SiC-1;
the asphalt is SBSI-D modified asphalt, and is purchased from Shanghai Puwang New Material science and technology company.
The present application will be described in further detail with reference to examples.
Preparation example
Preparation example 1
S1, firstly, cooking the steel slag for 2 hours by using deionized water, and then fishing out the steel slag from the deionized water and draining to obtain the cooked steel slag;
s2, firstly, melting 30kg of thermoplastic plastics, adding 2kg of nano silicon carbide powder, uniformly stirring, then placing 80kg of cooked steel slag in the molten thermoplastic plastics for soaking for 1 hour, fishing out the cooked steel slag from the molten thermoplastic plastics, and cooling to normal temperature to obtain the modified steel slag.
Preparation example 2
S1, firstly, cooking the steel slag for 2 hours by using deionized water, and then fishing out the steel slag from the deionized water and draining to obtain the cooked steel slag;
s2, firstly melting 20kg of thermoplastic plastics, adding 2kg of nano silicon carbide powder, uniformly stirring, then placing 100kg of cooked steel slag in the molten thermoplastic plastics for soaking for 1 hour, fishing out the cooked steel slag from the molten thermoplastic plastics, and cooling to normal temperature to obtain the modified steel slag.
Preparation example 3
S1, firstly, cooking the steel slag for 2 hours by using deionized water, and then fishing out the steel slag from the deionized water and draining to obtain the cooked steel slag;
s2, firstly melting 20kg of thermoplastic plastics, adding 2kg of nano silicon carbide powder, uniformly stirring, then placing 120kg of cooking steel slag in the molten thermoplastic plastics for soaking for 1 hour, fishing out the cooking steel slag from the molten thermoplastic plastics, and cooling to normal temperature to obtain the modified steel slag.
Preparation example 4
S1, firstly, cooking the steel slag for 2 hours by using deionized water, and then fishing out the steel slag from the deionized water and draining to obtain the cooked steel slag;
s2, firstly melting 25kg of thermoplastic plastics, adding 2kg of nano silicon carbide powder, uniformly stirring, then placing 100kg of cooked steel slag in the molten thermoplastic plastics for soaking for 1 hour, fishing out the cooked steel slag from the molten thermoplastic plastics, and cooling to normal temperature to obtain the modified steel slag.
Preparation example 5
S1, firstly, cooking the steel slag for 2 hours by using deionized water, and then fishing out the steel slag from the deionized water and draining to obtain the cooked steel slag;
s2, firstly, melting 30kg of thermoplastic plastics, adding 2kg of nano silicon carbide powder, uniformly stirring, then placing 100kg of cooked steel slag in the molten thermoplastic plastics for soaking for 1 hour, fishing out the cooked steel slag from the molten thermoplastic plastics, and cooling to normal temperature to obtain the modified steel slag.
Preparation example 6
S1, firstly, cooking the steel slag for 2 hours by using deionized water, and then fishing out the steel slag from the deionized water and draining to obtain the cooked steel slag;
s2, firstly melting 25kg of thermoplastic plastics, adding 2..5kg of nano silicon carbide powder, uniformly stirring, then placing 100kg of cooking steel slag in the molten thermoplastic plastics for soaking for 1 hour, fishing out the cooking steel slag from the molten thermoplastic plastics, and cooling to normal temperature to obtain the modified steel slag.
Preparation example 7
S1, firstly, cooking the steel slag for 2 hours by using deionized water, and then fishing out the steel slag from the deionized water and draining to obtain the cooked steel slag;
s2, firstly melting 25kg of thermoplastic plastics, adding 3kg of nano silicon carbide powder, uniformly stirring, then placing 100kg of cooked steel slag in the molten thermoplastic plastics for soaking for 1 hour, fishing out the cooked steel slag from the molten thermoplastic plastics, and cooling to normal temperature to obtain the modified steel slag.
Preparation example 8
S1, firstly, cooking the steel slag for 2 hours by using deionized water, and then fishing out the steel slag from the deionized water and draining to obtain the cooked steel slag;
s2, firstly drying 25kg of thermoplastic plastics by hot air at 70 ℃ for 2h, adding 2.5kg of nano silicon carbide powder after melting, uniformly stirring, then placing 100kg of cooking steel slag in the molten thermoplastic plastics for soaking for 1h, fishing out the cooking steel slag from the molten thermoplastic plastics and cooling to normal temperature to obtain the modified steel slag.
Preparation example 9
S1, firstly, cooking the steel slag for 2 hours by using deionized water, and then fishing the steel slag out of the deionized water in a nitrogen atmosphere to drain the steel slag, thereby preparing the cooked steel slag;
s2, firstly melting 25kg of thermoplastic plastics, adding 2.5kg of nano silicon carbide powder, uniformly stirring, then placing 100kg of cooking steel slag in the molten thermoplastic plastics for soaking for 1 hour, fishing out the cooking steel slag from the molten thermoplastic plastics, and cooling to normal temperature to obtain the modified steel slag.
Preparation example 10
S1, firstly, cooking the steel slag for 2 hours by using deionized water, and then fishing the steel slag out of the deionized water in a nitrogen atmosphere to drain the steel slag, thereby preparing the cooked steel slag;
s2, firstly drying 25kg of thermoplastic plastics by hot air at 70 ℃ for 2h, adding 2.5kg of nano silicon carbide powder after melting, uniformly stirring, then placing 100kg of cooking steel slag in the molten thermoplastic plastics for soaking for 1h, fishing out the cooking steel slag from the molten thermoplastic plastics and cooling to normal temperature to obtain the modified steel slag.
Preparation example 11
S1, firstly, cooking the steel slag for 2 hours by using deionized water, and then fishing the steel slag out of the deionized water in a nitrogen atmosphere to drain the steel slag, thereby preparing the cooked steel slag;
s2, firstly melting 25kg of thermoplastic plastics, adding 2.5kg of nano silicon carbide powder, uniformly stirring, then placing 100kg of cooking steel slag in the molten thermoplastic plastics for soaking for 1 hour, fishing out the cooking steel slag from the molten thermoplastic plastics, and cooling to normal temperature in a nitrogen atmosphere to obtain the modified steel slag.
Preparation example 12
S1, firstly, cooking the steel slag for 2 hours by using deionized water, and then fishing the steel slag out of the deionized water in a nitrogen atmosphere to drain the steel slag, thereby preparing the cooked steel slag;
s2, firstly drying 25kg of thermoplastic plastics by hot air at 70 ℃ for 2h, adding 2.5kg of nano silicon carbide powder after melting, uniformly stirring, then placing 100kg of cooked steel slag in the molten thermoplastic plastics for soaking for 1h, fishing out the cooked steel slag from the molten thermoplastic plastics, cooling to normal temperature in nitrogen atmosphere, and obtaining the modified steel slag.
Preparation example 13
S1, firstly, cooking the steel slag for 2 hours by using deionized water, and then fishing out the steel slag from the deionized water and draining to obtain the cooked steel slag;
s2, firstly, melting 30kg of thermoplastic plastics, adding 3kg of nano silicon carbide powder, uniformly stirring, then placing 120kg of cooking steel slag in the molten thermoplastic plastics for soaking for 1 hour, fishing out the cooking steel slag from the molten thermoplastic plastics, and cooling to normal temperature to obtain the modified steel slag.
Preparation example 14
S1, firstly, cooking the steel slag for 2 hours by using deionized water, and then fishing the steel slag out of the deionized water in a nitrogen atmosphere to drain the steel slag, thereby preparing the cooked steel slag;
s2, firstly drying 25kg of thermoplastic plastics by hot air at 70 ℃ for 2h, then melting, then placing 100kg of cooking steel slag in the molten thermoplastic plastics for soaking for 1h, fishing out the cooking steel slag from the molten thermoplastic plastics, and cooling to normal temperature in a nitrogen atmosphere to obtain the modified steel slag.
Preparation example 15
S1, firstly, cooking the steel slag for 2 hours by using deionized water, and then fishing the steel slag out of the deionized water in a nitrogen atmosphere to drain the steel slag, thereby preparing the cooked steel slag;
s2, weighing 2.5kg of nano silicon carbide powder and 100kg of steamed steel slag, and uniformly stirring and mixing in a nitrogen atmosphere to obtain the modified steel slag.
TABLE 1 preparation examples 1 to 15 raw materials and treatment tables
Examples
Example 1
S1, weighing 320kg of broken stone, 70kg of river sand, 330kg of stone chips and 140kg of modified steel slag prepared in preparation example 1, drying the crushed stone, the river sand, the stone chips and the modified steel slag for 2 hours at 100 ℃, and stirring and mixing the materials uniformly after drying to prepare an intermediate material;
and S2, mixing the intermediate material prepared in the S1 and 41kg of asphalt at 175 ℃ to obtain the steel slag asphalt mixture.
Example 2
S1, weighing 360kg of broken stone, 100kg of river sand, 370kg of stone chips and 140kg of modified steel slag prepared in preparation example 1, drying the crushed stone, the river sand, the stone chips and the modified steel slag for 2 hours at 100 ℃, and stirring and mixing the materials uniformly after drying to obtain an intermediate material;
and S2, mixing the intermediate material prepared in the S1 and 48kg of asphalt at 175 ℃ to obtain the steel slag asphalt mixture.
Example 3
S1, weighing 360kg of broken stone, 100kg of river sand, 370kg of stone chips and 170kg of the modified steel slag prepared in the preparation example 1, drying the crushed stone, the river sand, the stone chips and the modified steel slag for 2 hours at 100 ℃, and stirring and mixing the materials uniformly after drying to prepare an intermediate material;
and S2, mixing the intermediate material prepared in the S1 and 48kg of asphalt at 175 ℃ to obtain the steel slag asphalt mixture.
Example 4
S1, weighing 360kg of broken stone, 100kg of river sand, 370kg of stone chips and 200kg of modified steel slag prepared in preparation example 1, drying for 2 hours by hot air at 100 ℃, and stirring and mixing uniformly after drying to prepare an intermediate material;
and S2, mixing the intermediate material prepared in the S1 and 48kg of asphalt at 175 ℃ to obtain the steel slag asphalt mixture.
Example 5
S1, weighing 360kg of broken stone, 100kg of river sand, 370kg of stone chips and 170kg of the modified steel slag prepared in the preparation example 2, drying the crushed stone, the river sand, the stone chips and the modified steel slag for 2 hours at 100 ℃, and stirring and mixing the materials uniformly after drying to prepare an intermediate material;
and S2, mixing the intermediate material prepared in the S1 and 48kg of asphalt at 175 ℃ to obtain the steel slag asphalt mixture.
Example 6
S1, weighing 360kg of broken stone, 100kg of river sand, 370kg of stone chips and 170kg of the modified steel slag prepared in the preparation example 3, drying the crushed stone, the river sand, the stone chips and the modified steel slag for 2 hours at 100 ℃, and stirring and mixing the materials uniformly after drying to prepare an intermediate material;
and S2, mixing the intermediate material prepared in the S1 and 48kg of asphalt at 175 ℃ to obtain the steel slag asphalt mixture.
Example 7
S1, weighing 360kg of broken stone, 100kg of river sand, 370kg of stone chips and 170kg of the modified steel slag prepared in the preparation example 4, drying the crushed stone, the river sand, the stone chips and the modified steel slag for 2 hours at 100 ℃, and stirring and mixing the materials uniformly after drying to prepare an intermediate material;
and S2, mixing the intermediate material prepared in the S1 and 48kg of asphalt at 175 ℃ to obtain the steel slag asphalt mixture.
Example 8
S1, weighing 360kg of broken stone, 100kg of river sand, 370kg of stone chips and 170kg of the modified steel slag prepared in the preparation example 5, drying the crushed stone, the river sand, the stone chips and the modified steel slag for 2 hours at 100 ℃, and stirring and mixing the materials uniformly after drying to prepare an intermediate material;
and S2, mixing the intermediate material prepared in the S1 and 48kg of asphalt at 175 ℃ to obtain the steel slag asphalt mixture.
Example 9
S1, weighing 360kg of broken stone, 100kg of river sand, 370kg of stone chips and 170kg of the modified steel slag prepared in the preparation example 6, drying the crushed stone, the river sand, the stone chips and the modified steel slag for 2 hours at 100 ℃, and stirring and mixing the materials uniformly after drying to prepare an intermediate material;
and S2, mixing the intermediate material prepared in the S1 and 48kg of asphalt at 175 ℃ to obtain the steel slag asphalt mixture.
Example 10
S1, weighing 360kg of broken stone, 100kg of river sand, 370kg of stone chips and 170kg of the modified steel slag prepared in the preparation example 7, drying the crushed stone, the river sand, the stone chips and the modified steel slag for 2 hours at 100 ℃, and stirring and mixing the materials uniformly after drying to prepare an intermediate material;
and S2, mixing the intermediate material prepared in the S1 and 48kg of asphalt at 175 ℃ to obtain the steel slag asphalt mixture.
Example 11
S1, weighing 360kg of broken stone, 100kg of river sand, 370kg of stone chips and 170kg of the modified steel slag prepared in the preparation example 8, drying the crushed stone, the river sand, the stone chips and the modified steel slag for 2 hours at 100 ℃, and stirring and mixing the materials uniformly after drying to prepare an intermediate material;
and S2, mixing the intermediate material prepared in the S1 and 48kg of asphalt at 175 ℃ to obtain the steel slag asphalt mixture.
Example 12
S1, weighing 360kg of broken stone, 100kg of river sand, 370kg of stone chips and 170kg of the modified steel slag prepared in the preparation example 9, drying the crushed stone, the river sand, the stone chips and the modified steel slag for 2 hours at 100 ℃, and stirring and mixing the materials uniformly after drying to prepare an intermediate material;
and S2, mixing the intermediate material prepared in the S1 and 48kg of asphalt at 175 ℃ to obtain the steel slag asphalt mixture.
Example 13
S1, weighing 360kg of broken stone, 100kg of river sand, 370kg of stone chips and 170kg of the modified steel slag prepared in the preparation example 10, drying the crushed stone, the river sand, the stone chips and the modified steel slag for 2 hours at 100 ℃, and stirring and mixing the materials uniformly after drying to obtain an intermediate material;
and S2, mixing the intermediate material prepared in the S1 and 48kg of asphalt at 175 ℃ to obtain the steel slag asphalt mixture.
Example 14
S1, weighing 360kg of broken stone, 100kg of river sand, 370kg of stone chips and 170kg of the modified steel slag prepared in the preparation example 11, drying the crushed stone, the river sand, the stone chips and the modified steel slag for 2 hours at 100 ℃, and stirring and mixing the materials uniformly after drying to prepare an intermediate material;
and S2, mixing the intermediate material prepared in the S1 and 48kg of asphalt at 175 ℃ to obtain the steel slag asphalt mixture.
Example 15
S1, weighing 360kg of broken stone, 100kg of river sand, 370kg of stone chips and 170kg of the modified steel slag prepared in the preparation example 12, drying the crushed stone, the river sand, the stone chips and the modified steel slag for 2 hours at 100 ℃, and stirring and mixing the materials uniformly after drying to prepare an intermediate material;
and S2, mixing the intermediate material prepared in the S1 and 48kg of asphalt at 175 ℃ to obtain the steel slag asphalt mixture.
Example 16
S1, weighing 360kg of broken stone, 100kg of river sand, 370kg of stone chips and 170kg of the modified steel slag prepared in the preparation example 13, drying the crushed stone, the river sand, the stone chips and the modified steel slag for 2 hours at 100 ℃, and stirring and mixing the materials uniformly after drying to prepare an intermediate material;
and S2, mixing the intermediate material prepared in the S1 and 48kg of asphalt at 175 ℃ to obtain the steel slag asphalt mixture.
Example 17
S1, weighing 400kg of broken stone, 130kg of river sand, 410kg of stone chips and 200kg of modified steel slag prepared in preparation example 13, drying the crushed stone, the river sand, the stone chips and the modified steel slag for 2 hours at 100 ℃, and stirring and mixing the materials uniformly after drying to obtain an intermediate material;
and S2, mixing the intermediate material prepared in the S1 and 55kg of asphalt at 175 ℃ to obtain the steel slag asphalt mixture.
Comparative example
Comparative example 1
S1, weighing 360kg of broken stone, 100kg of river sand, 370kg of stone chips and 170kg of the modified steel slag prepared in the preparation example 14, drying the crushed stone, the river sand, the stone chips and the modified steel slag for 2 hours at 100 ℃, and stirring and mixing the materials uniformly after drying to prepare an intermediate material;
and S2, mixing the intermediate material prepared in the S1 and 48kg of asphalt at 175 ℃ to obtain the steel slag asphalt mixture.
Comparative example 2
S1, weighing 360kg of broken stone, 100kg of river sand, 370kg of stone chips and 170kg of the modified steel slag prepared in the preparation example 15, drying the crushed stone, the river sand, the stone chips and the modified steel slag for 2 hours at 100 ℃, and stirring and mixing the materials uniformly after drying to prepare an intermediate material;
and S2, mixing the intermediate material prepared in the S1 and 48kg of asphalt at 175 ℃ to obtain the steel slag asphalt mixture.
Comparative example 3
S1, weighing 360kg of broken stone, 100kg of river sand, 370kg of stone chips and 170kg of steel slag, drying for 2 hours by hot air at 100 ℃, and stirring and mixing uniformly after drying to obtain an intermediate material;
and S2, mixing the intermediate material prepared in the S1 and 48kg of asphalt at 175 ℃ to obtain the steel slag asphalt mixture.
Table 2 examples and comparative examples part of the raw material table
Performance test
According to a Marshall stability test of JTG E20-2011 road engineering asphalt and asphalt mixture test procedure T0709 and 2011 asphalt mixture, the performance of the asphalt mixtures prepared in the examples 1-17 and the comparative examples 1-3 is detected, and the Marshall stability (kN) and the soaking residual stability (%) are finally calculated, wherein the specific detection data are shown in a table 3.
According to JTG E20-2011 road engineering asphalt and asphalt mixture test procedure T0729 plus 2000 asphalt mixture freeze-thaw splitting test, the performance of the asphalt mixtures prepared in examples 1-17 and comparative examples 1-3 is detected, and finally the freeze-thaw splitting strength ratio (%) is calculated, wherein the specific detection data are shown in Table 3.
According to JTG E20-2011 road engineering asphalt and asphalt mixture test regulation T0733-.
TABLE 3 Performance test data sheet
It can be seen from the combination of example 15, comparative example 1, comparative example 2 and comparative example 3 and the combination of table 3 that, after the cooked steel slag is modified by the molten thermoplastic, the performance of the asphalt mixture is improved, because the surface and holes of the steel slag are wrapped by the thermoplastic, the erosion of water to the cooked steel slag is reduced, and after the nano silicon carbide powder is further added, the crystallization of the thermoplastic is promoted by the nano silicon carbide powder, the strength of the thermoplastic is improved, and the condition that the cooked steel slag is eroded by the outside air due to the rupture of the thermoplastic is effectively reduced; when the asphalt mixture is produced, the thermoplastic plastics are melted and mixed with the asphalt, when the raw materials are mixed, the asphalt and the thermoplastic plastics bond the raw materials, so that the bonding strength of the asphalt mixture is improved, and when the asphalt is cooled, the nano silicon carbide promotes the crystallization and solidification of the thermoplastic plastics, so that the solidification of the asphalt is promoted, the strength and the waterproof performance of the asphalt are improved, and the quality of the steel slag asphalt concrete is improved.
Combining example 11, example 12, example 13, example 14 and example 15 with table 3, it can be seen that drying the thermoplastic plastic first can effectively improve the performance of the asphalt mixture, because the moisture in the thermoplastic plastic is reduced after the thermoplastic plastic is dried, thereby reducing the influence of water on the asphalt during the later asphalt mixing process;
the nitrogen environment is arranged to improve the performance of the asphalt mixture, and the erosion of carbon dioxide to steel slag in the preparation process of the modified steel slag is effectively reduced due to the nitrogen environment, so that the generation of calcium carbonate on the steel slag is effectively reduced, the strength of the modified steel slag is improved, the stability of the steel slag asphalt mixture is improved, and the quality of a steel slag asphalt concrete pavement is improved.
By combining the example 2, the example 3 and the example 4 and combining the table 3, it can be seen that the water stability of the steel slag asphalt mixture can be effectively improved by selecting the raw material ratio, and the quality of the steel slag asphalt concrete pavement can be further improved.
By combining the examples 3, 7, 8, 9 and 10, it can be seen that the water stability of the steel slag asphalt mixture can be effectively improved by selecting the appropriate modified steel slag, and the quality of the steel slag asphalt concrete pavement can be further improved.
The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.
Claims (8)
1. The low-activity steel slag asphalt mixture is characterized by being prepared from the following raw materials in parts by weight,
aggregate: 720-940 parts of a solvent, namely,
modified steel slag: 140 to 170 parts of a water-soluble polymer,
asphalt: 41-55 parts of (a) a water-soluble polymer,
the modified steel slag is prepared from cooked steel slag, thermoplastic plastics and nano silicon carbide powder, and the weight ratio of the cooked steel slag, the thermoplastic plastics and the nano silicon carbide powder is 80-120: 20-30: 2-3, wherein the steamed steel slag is prepared by steaming steel slag through deionized water.
2. The low-activity steel slag asphalt mixture as claimed in claim 1, wherein the preparation method of the modified steel slag comprises the following steps:
s1, firstly, cooking the steel slag by using deionized water, and then fishing out the steel slag from the deionized water and draining to obtain the cooked steel slag;
s2, firstly, melting the thermoplastic plastics, adding the nano silicon carbide powder, uniformly stirring, then placing the cooking steel slag into the molten thermoplastic plastics for soaking, fishing out the cooking steel slag from the molten thermoplastic plastics, and cooling to normal temperature to obtain the modified steel slag.
3. A low-activity steel slag asphalt mixture as claimed in any one of claims 1 or 2, wherein said thermoplastic is one of PE plastic, PC plastic or POM plastic.
4. The low-activity steel slag asphalt mixture as claimed in claim 2, wherein the thermoplastic plastic is dried before being melted.
5. The low-activity steel slag asphalt mixture as claimed in any one of claims 2 to 4, wherein the steel slag in S1 is drained in a nitrogen atmosphere.
6. The low-activity steel slag asphalt mixture as claimed in claim 5, wherein the steel slag boiled in S2 is cooled to normal temperature in nitrogen atmosphere after being fished out from the molten thermoplastic.
7. The low-activity steel slag asphalt mixture as claimed in claim 1, wherein the aggregate comprises crushed stone, river sand and stone chips, and the mass ratio of the crushed stone to the river sand to the stone chips is 320-400: 70-130: 330-410, the particle size of the broken stone is 9.5-16 mm, the particle size of the river sand is 2.36-4.75 mm, the particle size of the stone chips is 0-2.36 mm, and the particle size of the steamed steel slag is 4.75-9.5 mm.
8. The method for preparing a low-activity steel slag asphalt mixture as claimed in any one of claims 1 to 7, which is characterized by comprising the following steps:
s1, stirring and mixing the aggregate and the modified steel slag uniformly to prepare an intermediate material;
and S2, mixing the intermediate material prepared in the S1 and asphalt uniformly in a hot mixing manner to obtain a mixture.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014094318A1 (en) * | 2012-12-17 | 2014-06-26 | 武汉理工大学 | Foamed asphalt-steel slag mixture and method for preparing thereof |
| CN104326706A (en) * | 2014-10-15 | 2015-02-04 | 葛映东 | Steel slag asphalt mixed material and preparation method thereof |
| CN110104996A (en) * | 2019-06-19 | 2019-08-09 | 湖南鑫长胜材料科技有限公司 | A kind of high-durability steel slag asphalt concrete pavement material and preparation method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014094318A1 (en) * | 2012-12-17 | 2014-06-26 | 武汉理工大学 | Foamed asphalt-steel slag mixture and method for preparing thereof |
| CN104326706A (en) * | 2014-10-15 | 2015-02-04 | 葛映东 | Steel slag asphalt mixed material and preparation method thereof |
| CN110104996A (en) * | 2019-06-19 | 2019-08-09 | 湖南鑫长胜材料科技有限公司 | A kind of high-durability steel slag asphalt concrete pavement material and preparation method |
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