CN108947328B - Steel slag permeable asphalt mixture based on waste rubber powder modified high-viscosity asphalt - Google Patents
Steel slag permeable asphalt mixture based on waste rubber powder modified high-viscosity asphalt Download PDFInfo
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- CN108947328B CN108947328B CN201810835247.3A CN201810835247A CN108947328B CN 108947328 B CN108947328 B CN 108947328B CN 201810835247 A CN201810835247 A CN 201810835247A CN 108947328 B CN108947328 B CN 108947328B
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00017—Aspects relating to the protection of the environment
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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
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/0075—Uses not provided for elsewhere in C04B2111/00 for road construction
Abstract
The invention relates to a steel slag permeable asphalt mixture based on crumb rubber modified high-viscosity asphalt, which comprises the following raw materials in parts by weight: 82-86 parts of steel slag coarse aggregate, 10-14 parts of basalt fine aggregate, 4 parts of limestone filler and 4.4-4.6 parts of waste rubber powder modified high-viscosity asphalt. According to the invention, the steel slag is used for replacing coarse aggregates, and the waste rubber powder is added for modifying the high-viscosity asphalt, so that the porosity of the prepared steel slag permeable asphalt mixture meets the requirement, and the steel slag permeable asphalt mixture has higher Marshall stability and smaller Schlumberger leakage loss and Kentberg scattering rate.
Description
Technical Field
The invention relates to the field of asphalt roads, in particular to the technical field of highway building materials, and particularly relates to a steel slag permeable asphalt mixture based on crumb rubber modified high-viscosity asphalt.
Background
With the continuous development of the economy of China, the construction business of the expressway is also rapidly increased. And because of the advantages of good driving comfort, excellent service performance, high construction speed, convenient maintenance and the like, 90 percent of highway pavement structural forms all adopt the asphalt pavement structural form. About 90 percent of the existing asphalt pavement is designed according to the density gradation principle, and belongs to the density gradation asphalt concrete pavement with smaller void ratio. The road surface has high strength, good water stability, low-temperature crack resistance and durability, but poor water permeability, so that a large amount of rainwater is gathered on the road surface, and urban traffic jam and unsafe high-speed driving are caused. Therefore, more and more researchers have extensively conducted research on permeable asphalt pavements. The water-permeable asphalt pavement is of a porous structure
The skeleton embedded and extruded ecological environment-friendly pavement has the pavement void ratio as high as about 18-25%, and the internal structure is a pavement structure which can meet the pavement strength requirement and durability requirement and is formed by a series of porous structures communicated with the interior. The water-permeable concrete pavement has the advantages of reducing noise, reducing surface runoff and the like, improves driving conditions in rainy days and winter, and effectively improves driving safety and comfortableness.
The specific gravity of aggregate in the asphalt mixture reaches 90-95 percent, so that the problem is caused that roads paved every year consume a large amount of high-quality stones in China, wherein the most used stones are basalt and limestone. The limestone belongs to sedimentary rock, and has the advantages of huge reserve, low price and simple exploitation. However, limestone in most areas of China has become a scarce resource after decades of destructive exploitation. The total reserve of limestone in China is about 750 hundred million tons, and the requirement of infrastructure in China can be maintained for 15 years at most according to the current consumption speed. The steel slag is slag discharged in the steel-making process and is a main solid byproduct in the smelting industry, the production rate of the steel slag is about 10-15% of the yield of the crude steel, and the yield is very large. The steel slag is directly discarded as waste, and a large amount of steel slag is piled up to form a mountain, so that the steel slag occupies a large amount of land resources and causes great pollution to the environment. The crumb rubber as a chemically crosslinked rubber generates a three-dimensional space network through chemical bonds, has complex components, is more difficult to swell in asphalt than common rubbers (SBR, BR and the like), thereby causing poor storage stability of crumb rubber modified asphalt and limited modification effect, so the key problem of modification is how to effectively dissolve the crumb rubber in the asphalt and enable the crumb rubber to be stably stored.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a steel slag permeable asphalt mixture based on crumb rubber modified high-viscosity asphalt, wherein the steel slag is used for replacing coarse aggregates, basalt is used for fine aggregates, and the crumb rubber modified high-viscosity asphalt is added, and the porosity of the prepared steel slag permeable asphalt mixture meets the requirement (the steel slag permeable asphalt mixture has larger porosity and average porosity of 20 percent), and has higher Marshall stability and smaller Schlumberg leakage loss and Kentunberg scattering rate.
In order to achieve the purpose, the invention adopts the technical scheme that:
a steel slag permeable asphalt mixture based on crumb rubber modified high-viscosity asphalt comprises the following raw materials, by weight, 82-86 parts of steel slag coarse aggregate, 10-14 parts of basalt aggregate, 4 parts of limestone filler and 4.4-4.6 parts of crumb rubber modified high-viscosity asphalt;
the waste rubber powder modified high-viscosity asphalt is obtained by heating road petroleum asphalt to 180-190 ℃, adding waste rubber powder, a high-viscosity additive, a dispersing agent and a stabilizing agent, shearing and then putting into an oven for development.
The petroleum asphalt is 70# road petroleum asphalt, the addition amount of the waste rubber powder is 18-22% of the weight of the road petroleum asphalt, the addition amount of the high-viscosity additive is 7.5-8.5% of the weight of the road petroleum asphalt, the addition amount of the dispersing agent is 0.1-1% of the weight of the road petroleum asphalt, and the addition amount of the stabilizing agent is 0.1-1% of the weight of the road petroleum asphalt. The matrix asphalt is fully swelled in the three-dimensional network structure of the waste rubber powder under the action of high temperature and long-term high-speed shearing.
The shearing temperature is 180-190 ℃, the shearing speed is 450-550r/min, and the shearing time is 25-35 min; the development conditions are as follows: the development temperature is 175-185 ℃, and the development time is 28-32 min.
Preferably, the mass of the single particles of the high-viscosity additive is less than 0.03g, and the relative density is 0.93g/cm3The melt index is 1.8g/10min, and the ash content is less than 2%.
The high viscosity additive is TPS (Tafpack super) high viscosity asphalt additive or HVA high viscosity asphalt modifier or rubber-diatomite modifier or mixture modifier of styrene prepolymer and butadiene prepolymer or combination thereof.
The rubber-diatomite modifier comprises rubber, diatomite, aromatic oil and a surfactant; by weight percentage, the rubber content is 85% -90%, the diatomite content is 5% -10%, the aromatic oil content is 1% -3%, and the surfactant content is 0.1% -0.8%;
styrene prepolymer and butadiene prepolymer mixture modifier the weight ratio of styrene prepolymer to butadiene prepolymer is 2.5:1
Preferably, the stabilizing agent is dicumyl peroxide; the dispersing agent is a mixture of sodium pyrophosphate and sodium hexametaphosphate in a weight ratio of 2: 3.
Preferably, the fineness of the waste rubber powder is 100-120 meshes, the water content is less than 5%, and the waste rubber powder is prepared from waste tires. The size of the particle size of the rubber powder has great influence on the performance of the modified asphalt, the finer the rubber powder is, the easier the rubber powder swells in the asphalt and is beneficial to improving the ductility and the penetration of the modified asphalt, but the too fine rubber powder is difficult to form a framework structure in the asphalt, so that the elasticity of the asphalt is weakened, and the asphalt is easy to flow and deform when the temperature is increased.
Preferably, the steel slag coarse aggregate comprises, by weight, 36-44 parts of steel slag coarse aggregate with the particle size of 4.75-9.5 mm and 38-50 parts of steel slag coarse aggregate with the particle size of 9.5-16 mm.
Preferably, the apparent relative density of the steel slag coarse aggregate is 3.20-3.30 g/cm3To (c) to (d); the content of free calcium oxide is 1.7-2.0%; the volume expansion rate of the product is not more than 1.5 percent after being soaked in hot water at 60 ℃ for 120 h.
Preferably, the basalt aggregate comprises, by weight, 10-14 parts of basalt aggregate with the particle size of 0-2.36 mm and 0.001-5 parts of basalt aggregate with the particle size of 2.36-4.75 mm.
The limestone filler has the particle size distribution of 7.1% of limestone filler with the particle size of 0-1 mu m, 39.0% of limestone filler with the particle size of 1-10 mu m, 42.1% of limestone filler with the particle size of 10-50 mu m and 11.8% of limestone filler with the particle size of 50-75 mu m.
Preferably, the apparent relative density of the basalt aggregate is 2.86-2.87 g/cm3(ii) a The mud content (less than 0.075 mm) is 2.4-2.5%.
Preferably, the waste rubber powder accounts for 20 percent of the petroleum asphalt for the road in percentage by weight; the road petroleum asphalt is No. 90 road petroleum asphalt.
Compared with the prior art, the steel slag permeable asphalt mixture provided by the invention uses the steel slag to replace coarse aggregates, uses the basalt fine aggregates and adds the waste rubber powder to modify the high-viscosity asphalt, forms a net structure in the asphalt mixture, greatly reduces the cost, realizes the reutilization of the steel slag and the waste rubber powder, designs the initial test grading in three standard requirements, and analyzes whether the porosity and the Marshall stability of the steel slag permeable asphalt mixture meet the requirements of the national highway asphalt pavement construction technical specification. In addition, the porosity of the steel slag permeable asphalt mixture averagely reaches 20%, road surface runoff can be dredged quickly, driving safety of a road surface in rainy days is improved, the Schrenberg leakage loss and the Kentucky scattering rate are small, and the steel slag permeable asphalt mixture has good overall strength and good durability. The steel slag permeable asphalt mixture enriches the application ways of steel slag and waste rubber powder in asphalt pavements, reduces the requirements on natural high-quality stone and SBS modified asphalt, is beneficial to protecting geological environment, and realizes high added value recycling of industrial wastes.
The invention has the beneficial effects that:
1. according to the invention, the steel slag is used for replacing coarse aggregates, the fine aggregates are basalt, and the waste rubber powder is added for modifying the high-viscosity asphalt, so that the porosity of the prepared steel slag permeable asphalt mixture meets the requirement (the porosity of the steel slag permeable asphalt mixture is relatively large, the average porosity can reach 20%), and the steel slag permeable asphalt mixture has relatively high Marshall stability and relatively small Schlumberger leakage loss and Kentuckberg scattering rate, is a skeleton-embedded extruded type ecological environment-friendly material with a porous structure, can rapidly dredge road surface runoff, and improves the driving safety of road surfaces in rainy days.
2. The waste rubber powder modified high-viscosity asphalt which is effectively degraded and stably stored can be obtained by adding a certain content of waste rubber powder into matrix asphalt and preparing the waste rubber powder modified high-viscosity asphalt through high-temperature high-speed shearing, and the waste rubber powder modified high-viscosity asphalt can be applied to a drainage asphalt pavement.
3. The steel slag permeable asphalt mixture provided by the invention uses steel slag to replace coarse aggregate, uses basalt fine aggregate, and adds the waste rubber powder to modify the high-viscosity asphalt, so as to form a net structure in the asphalt mixture, greatly reduce the cost, realize the reutilization of the steel slag and the waste rubber powder, design the initial test grading in three standard requirements, study the influence of the void ratio on the performance of the steel slag permeable asphalt mixture, and determine that the porosity and the Marshall stability of the steel slag permeable asphalt mixture meet the requirements of the national highway asphalt pavement construction technical specification through the comprehensive analysis of the influence factors such as the void ratio and the stability of a Marshall test piece.
4. The Shernberg leakage loss and Kentunberg scattering rate of the steel slag permeable asphalt mixture are small, which shows that the steel slag permeable asphalt mixture has good overall strength and good durability. The steel slag permeable asphalt mixture enriches the application ways of steel slag and waste rubber powder in asphalt pavements, reduces the requirements on natural high-quality stone and modified asphalt, is favorable for protecting geological environment, and realizes the resource utilization of industrial wastes.
5. The particle size of the rubber powder has great influence on the performance of the modified asphalt, the finer the rubber powder is, the easier the rubber powder swells in the asphalt, and the improvement of the ductility and the penetration of the modified asphalt is facilitated, but the too fine rubber powder is difficult to form a framework structure in the asphalt, so that the elasticity of the asphalt is weakened, the asphalt is easy to flow and deform when the temperature is increased, and the fineness of the rubber powder is preferably 100-120 meshes from the economic and technical aspects.
6. The waste rubber powder modified high-viscosity asphalt consists of waste rubber powder and road petroleum asphalt, and the matrix asphalt is fully swelled in a three-dimensional network structure of the waste rubber powder under the action of high-temperature and long-term high-speed shearing.
7. The steel slag permeable asphalt mixture enriches the application ways of steel slag and waste rubber powder in asphalt pavements, reduces the requirements on natural high-quality stone and SBS modified asphalt, is beneficial to protecting geological environment, and realizes high added value recycling of industrial wastes.
Detailed Description
The present invention will be described in further detail with reference to specific examples, but the embodiments of the present invention are not limited to the scope of the examples. These examples are intended to illustrate the invention only and are not intended to limit the scope of the invention. In addition, various modifications may occur to those skilled in the art upon reading the present disclosure, and such equivalent variations are within the scope of the present invention as defined in the appended claims.
Example 1
Preparing steel slag coarse aggregates with the grain sizes of 4.75-9.5 mm and 9.5-16 mm, basalt fine aggregates with the grain sizes of 0-2.36 mm and 2.36-4.75 mm and common limestone filler.
Weighing 44% and 38% of steel slag coarse aggregates with the particle sizes of 4.75-9.5 mm and 9.5-16 mm respectively, weighing 14% and 0% of basalt fine aggregates with the particle sizes of 0-2.36 mm and 2.36-4.75 mm respectively, mixing with 4% of limestone filler, drying in an oven at 170 ℃ to constant weight, pouring into mixing equipment, adding 4.6% of waste rubber powder modified high-viscosity asphalt, and uniformly mixing for 180s to obtain the high-viscosity asphalt.
The steel slag is converter hot splashing steel slag produced by Wuhan iron and steel company, is prepared by aging for one year under natural conditions and grinding by a cement grinding machine, and has an apparent relative density of 3.20-3.30 g/cm3The content of f-CaO is between 1.7 and 2.0 percent, and the volume expansion rate of the F-CaO is not more than 1.5 percent after the F-CaO is soaked in hot water at the temperature of 60 ℃ for 120 hours; the apparent relative density of the basalt fine aggregate is 2.86-2.87 g/cm3The mud content (less than 0.075 mm) is 2.4-2.5%; particle size distribution of limestone filler: 7.1% of 0-1 μm, 39.0% of 1-10 μm, 42.1% of 10-50 μm and 11.8% of 50-75 μm; the waste rubber powder modified high-viscosity asphalt is prepared by heating 70# road petroleum asphalt to 180-190 ℃, adding waste rubber powder, a high-viscosity additive, a dispersing agent and a stabilizing agent according to the use amounts of 20%, 8%, 0.5% and 0.5% of the weight of the asphalt, continuously shearing for 30min under a high-speed shearing machine with the rotating speed of 5000 r/min, controlling the temperature in the whole process to be 180-190 ℃, closing the shearing machine, and putting the modified asphalt into a 180 ℃ oven to develop for 30 min.
Wherein: the high-viscosity additive is formed by combining a rubber-diatomite modifier and a mixture modifier of a styrene prepolymer and a butadiene prepolymer according to the mass ratio of 3: 5.
The rubber-diatomite modifier comprises rubber, diatomite, aromatic oil and a surfactant; by weight percentage, the rubber content is 88 percent, the diatomite content is 8 percent, the aromatic oil content is 4 percent, and the surfactant content is 0.6 percent;
styrene prepolymer and butadiene prepolymer mixture modifier the weight ratio of styrene prepolymer to butadiene prepolymer was 2.5: 1.
The stabilizing agent is dicumyl peroxide; the dispersing agent is a mixture of sodium pyrophosphate and sodium hexametaphosphate in a weight ratio of 2: 3.
Example 2
Preparing steel slag coarse aggregate with the grain size specification of 4.75-9.5 mm and 9.5-16 mm; 0-2.36 mm and 2.36-4.75 mm basalt fine aggregates; limestone filler is commonly used.
Weighing 40% and 44% of steel slag coarse aggregates with the particle sizes of 4.75-9.5 mm and 9.5-16 mm respectively, weighing 12% and 0% of basalt fine aggregates with the particle sizes of 0-2.36 mm and 2.36-4.75 mm respectively, mixing with 4% of limestone filler, drying in an oven at 170 ℃ to constant weight, pouring into mixing equipment, adding 5.5% of waste rubber powder modified high-viscosity asphalt, and uniformly mixing for 180s to obtain the high-viscosity asphalt.
The steel slag is converter hot splashing steel slag produced by Wuhan iron and steel company, is prepared by aging for one year under natural conditions and grinding by a cement grinding machine, and has an apparent relative density of 3.20-3.30 g/cm3The content of f-CaO is between 1.7 and 2.0 percent, and the volume expansion rate of the F-CaO is not more than 1.5 percent after the F-CaO is soaked in hot water at the temperature of 60 ℃ for 120 hours; the apparent relative density of the basalt fine aggregate is 2.86-2.87 g/cm3The mud content (less than 0.075 mm) is 2.4-2.5%; particle size distribution of limestone filler: 7.1% of 0-1 μm, 39.0% of 1-10 μm, 47.6% of 10-50 μm and 6.3% of 50-100 μm; the waste rubber powder modified high-viscosity asphalt is prepared by heating 70# road petroleum asphalt to 180-190 ℃, adding waste rubber powder, a high-viscosity additive, a dispersing agent and a stabilizing agent according to the use amounts of 20%, 8%, 0.5% and 0.5% of the weight of the asphalt, continuously shearing for 30min under a high-speed shearing machine with the rotating speed of 5000 r/min, controlling the temperature in the whole process to be 180-190 ℃, closing the shearing machine, and putting the modified asphalt into a 180 ℃ oven to develop for 30 min.
Wherein: the high-viscosity additive is formed by combining a rubber-diatomite modifier and a mixture modifier of a styrene prepolymer and a butadiene prepolymer according to the mass ratio of 3: 5.
The rubber-diatomite modifier comprises rubber, diatomite, aromatic oil and a surfactant; by weight percentage, the rubber content is 88 percent, the diatomite content is 8 percent, the aromatic oil content is 4 percent, and the surfactant content is 0.6 percent;
styrene prepolymer and butadiene prepolymer mixture modifier the weight ratio of styrene prepolymer to butadiene prepolymer was 2.5: 1.
The stabilizing agent is dicumyl peroxide; the dispersing agent is a mixture of sodium pyrophosphate and sodium hexametaphosphate in a weight ratio of 2: 3.
Example 3
Preparing steel slag coarse aggregates with the grain sizes of 4.75-9.5 mm and 9.5-16 mm, basalt fine aggregates with the grain sizes of 0-2.36 mm and 2.36-4.75 mm and common limestone fillers.
Weighing 36 percent and 50 percent of steel slag coarse aggregates with the particle sizes of 4.75-9.5 mm and 9.5-16 mm respectively, weighing 10 percent and 0 percent of basalt fine aggregates with the particle sizes of 0-2.36 mm and 2.36-4.75 mm respectively, mixing the steel slag coarse aggregates with 4 percent of limestone filler, drying the mixture in a 170 ℃ oven to constant weight, pouring the mixture into mixing equipment, adding 5.2 percent of waste rubber powder modified high-viscosity asphalt, and uniformly mixing the mixture for 180s to obtain the high-viscosity asphalt.
The steel slag is converter hot splashing steel slag produced by Wuhan iron and steel company, is prepared by aging for one year under natural conditions and grinding by a cement grinding machine, and has an apparent relative density of 3.20-3.30 g/cm3The content of f-CaO is between 1.7 and 2.0 percent, and the volume expansion rate of the F-CaO is not more than 1.5 percent after the F-CaO is soaked in hot water at the temperature of 60 ℃ for 120 hours; the apparent relative density of the basalt fine aggregate is 2.86-2.87 g/cm3The mud content (less than 0.075 mm) is 2.4-2.5%; particle size distribution of limestone filler: 7.1% of 0-1 μm, 39.0% of 1-10 μm, 47.6% of 10-50 μm and 6.3% of 50-100 μm; the waste rubber powder modified high-viscosity asphalt is prepared by heating 70# road petroleum asphalt to 180-190 ℃, adding waste rubber powder, high-viscosity additive, dispersant and stabilizer according to the use amount of 20%, 8%, 0.5% and 0.5% of the asphalt weight, continuously shearing for 30min under a high-speed shearing machine with the rotating speed of 5000 r/min, and controlling the temperature in the whole process at 180 DEG CAnd (3) closing the shearing machine at the temperature of between 190 ℃, and putting the modified asphalt into an oven at the temperature of 180 ℃ for development for 30min to obtain the modified asphalt.
Wherein: the high-viscosity additive is formed by combining a rubber-diatomite modifier and a mixture modifier of a styrene prepolymer and a butadiene prepolymer according to the mass ratio of 3: 5.
The rubber-diatomite modifier comprises rubber, diatomite, aromatic oil and a surfactant; by weight percentage, the rubber content is 87%, the diatomite content is 8%, the aromatic oil content is 4.4%, and the surfactant content is 0.6%;
styrene prepolymer and butadiene prepolymer mixture modifier the weight ratio of styrene prepolymer to butadiene prepolymer was 2.5: 1.
The stabilizing agent is dicumyl peroxide; the dispersing agent is a mixture of sodium pyrophosphate and sodium hexametaphosphate in a weight ratio of 2: 3.
The properties of the steel slag permeable asphalt mixture prepared in example 1, example 2 and example 3 are shown in table 1.
The properties of the steel slag permeable asphalt mixture prepared in examples 1, 2 and 3 are shown in Table 1.
TABLE 1 Water-permeable asphalt mixture Properties of Steel slag
As can be seen from Table 1: the porosity of the three steel slag permeable asphalt mixtures designed by the invention is 20%, the requirements of the national highway asphalt pavement construction technical specifications are met, the road surface runoff can be dredged quickly, and the driving safety of the road surface in rainy days is improved; the higher rutting stability and the higher water immersion residue degree prove the better high temperature stability and water stability; the Schrenberg leakage loss and the Kentunberg flying rate of the steel slag permeable asphalt mixture both meet the domestic specification; meanwhile, the steel slag has a lower volume expansion rate, which indicates that the steel slag used at this time is fully weathered in the stacking process, and the content of free calcium oxide is lower, so that the expansibility of the steel slag is weakened, and the steel slag has better overall strength and good durability.
Example 4
Otherwise, the kind and composition of the high viscosity additive were changed as in example 3, and the specific differences are shown in Table 2.
The rubber-diatomite modifier comprises rubber, diatomite, aromatic oil and a surfactant; by weight percentage, the rubber content is 87%, the diatomite content is 8%, the aromatic oil content is 4.4%, and the surfactant content is 0.6%;
styrene prepolymer and butadiene prepolymer mixture modifier the weight ratio of styrene prepolymer to butadiene prepolymer was 2.5: 1.
TABLE 3 Water-permeable asphalt mixture Properties of slag
As can be seen from Table 2: the high viscosity additive consists of HVA high viscosity asphalt modifier: rubber-diatomaceous earth modifier: the pavement performance of the mixture modifier of the styrene prepolymer and the butadiene prepolymer is better than that of other mixtures according to the mass ratio of 3:3: 5.
Example 5
The composition of the high-viscosity additive is the same as that of comparative example 7 in example 4, and the other is the same as that of example 3, except that: the rubber-diatomite modifier comprises rubber, diatomite, aromatic oil and a surfactant; the rubber content is 87 percent, the diatomite content is 8 percent, the aromatic oil content is 4.4 percent, the surfactant content is 0.3 percent, the konjac glucan is 0.24 percent, and the polyethylene glycol is 0.06 percent.
TABLE 4 Water-permeable asphalt mixture Properties of slag
As can be seen from Table 3: the konjac glucomannan is added into the rubber-diatomite modifier, and can form irreversible gel in the heating process under the weak base condition provided by the polyethylene glycol.
In conclusion, the steel slag permeable asphalt mixture well overcomes the defects of high-quality aggregate, fully exerts the excellent characteristics of high hardness and high wear resistance of the steel slag, can improve the running comfort and driving safety of vehicles, can provide a new breakthrough point for resource utilization of the steel slag, solves the problem of environmental pollution caused by steel slag stacking in China to a certain extent, and opens up a wide prospect for converting the steel slag from solid waste into high-quality asphalt concrete wear-resistant aggregate resources. Meanwhile, a solution is provided for the problem of accumulation of a large amount of waste tires in China, and the problem of insufficient high-quality modified asphalt at the present stage is solved.
Claims (6)
1. A steel slag permeable asphalt mixture based on crumb rubber modified high-viscosity asphalt is characterized in that:
the mixture comprises the following raw materials, by weight, 82-86 parts of steel slag coarse aggregate, 10-14 parts of basalt aggregate, 4 parts of limestone filler and 4.4-4.6 parts of waste rubber powder modified high-viscosity asphalt;
the waste rubber powder modified high-viscosity asphalt is obtained by heating road petroleum asphalt to 180-190 ℃, adding waste rubber powder, a high-viscosity additive, a dispersing agent and a stabilizing agent, shearing and then putting into an oven for development, wherein the shearing temperature is 180-190 ℃, the shearing speed is 450-550r/min, and the shearing time is 25-35 min; the development conditions are as follows: the development temperature is 175-185 ℃, and the development time is 28-32 min; the petroleum asphalt is No. 70 road petroleum asphalt, the addition amount of the waste rubber powder is 18-22% of the weight of the road petroleum asphalt, the addition amount of the high-viscosity additive is 7.5-8.5% of the weight of the road petroleum asphalt, the addition amount of the dispersing agent is 0.1-1% of the weight of the road petroleum asphalt, and the addition amount of the stabilizing agent is 0.1-1% of the weight of the road petroleum asphalt;
the steel slag coarse aggregate comprises the following components, by weight, 36-44 parts of steel slag coarse aggregate with the grain size of 4.75-9.5 mm and 38-50 parts of steel slag coarse aggregate with the grain size of 9.5-16 mm; the basalt aggregate comprises the following components, by weight, 10-14 parts of basalt aggregate with the grain size of 0-2.36 mm and 0.001-5 parts of basalt aggregate with the grain size of 2.36-4.75 mm;
the limestone filler has the particle size distribution of 7.1% of limestone filler with the particle size of 0-1 mu m, 39.0% of limestone filler with the particle size of 1-10 mu m, 42.1% of limestone filler with the particle size of 10-50 mu m and 11.8% of limestone filler with the particle size of 50-75 mu m.
2. The steel slag permeable asphalt mixture based on the crumb rubber modified high-viscosity asphalt as claimed in claim 1, wherein the mass of single particles of the high-viscosity additive is less than 0.03g, and the relative density is 0.93g/cm3The melt index is 1.8g/10min, and the ash content is less than 2 percent; the high-viscosity additive is TPS high-viscosity asphalt additive or HVA high-viscosity asphalt modifier or rubber-diatomite modifier or mixture modifier of styrene prepolymer and butadiene prepolymer or combination thereof.
3. The steel slag permeable asphalt mixture based on the crumb rubber modified high-viscosity asphalt as claimed in claim 1, wherein the stabilizer is dicumyl peroxide; the dispersing agent is a mixture of sodium pyrophosphate and sodium hexametaphosphate in a weight ratio of 2: 3.
4. The steel slag permeable asphalt mixture based on the crumb rubber modified high-viscosity asphalt as claimed in claim 1, which is characterized in that: the fineness of the waste rubber powder is 100-120 meshes, the water content is less than 5%, and the waste rubber powder is prepared from waste tires.
5. The steel slag permeable asphalt mixture based on the crumb rubber modified high-viscosity asphalt as claimed in claim 1, which is characterized in that: the apparent relative density of the steel slag coarse aggregate is 3.20-3.30 g/cm3To (c) to (d); the content of free calcium oxide is 1.7-2.0%; the volume expansion rate of the product is not more than 1.5 percent after being soaked in hot water at 60 ℃ for 120 h.
6. The steel slag permeable asphalt mixture based on the crumb rubber modified high-viscosity asphalt as claimed in claim 1, which is characterized in that: the apparent relative density of the basalt aggregate is 2.86-2.87 g/cm3(ii) a The content of the mud is 2.4-2.5% when the mud content is less than 0.075 mm.
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| CN111056770A (en) * | 2019-12-31 | 2020-04-24 | 江苏宝利路面材料技术有限公司 | Preparation method of asphalt mixture for low-temperature paved and high-weather-resistance drainage pavement |
| CN116535137A (en) * | 2023-03-27 | 2023-08-04 | 东南大学 | Tunnel pavement mixture with porous steel slag loaded with nano flame retardant and construction method thereof |
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| CN104725883A (en) * | 2015-04-20 | 2015-06-24 | 武汉理工大学 | High-viscosity high-elasticity asphalt based on surface modification of rubber particles, and high-viscosity high-elasticity SMA (stone mastic asphalt) mixture based on surface modification of rubber particles and preparing method thereof |
| CN106431089A (en) * | 2016-09-26 | 2017-02-22 | 吉林大学 | Dephosphorizing copper slag modified asphalt mixture and preparation method thereof |
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| CN107304112A (en) * | 2016-04-19 | 2017-10-31 | 中建西部建设新疆有限公司 | Green bituminous concrete modified pitch of high-durability energy and preparation method thereof |
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| CN106431089A (en) * | 2016-09-26 | 2017-02-22 | 吉林大学 | Dephosphorizing copper slag modified asphalt mixture and preparation method thereof |
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