CN112723792A - Modified asphalt mixture and preparation method thereof - Google Patents

Modified asphalt mixture and preparation method thereof Download PDF

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Publication number
CN112723792A
CN112723792A CN202110221751.6A CN202110221751A CN112723792A CN 112723792 A CN112723792 A CN 112723792A CN 202110221751 A CN202110221751 A CN 202110221751A CN 112723792 A CN112723792 A CN 112723792A
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modified asphalt
parts
fiber
asphalt mixture
asphalt
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贾永明
胡敬东
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Beijing Lingbei Road Building Materials Co ltd
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Beijing Lingbei Road Building Materials 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
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
    • C04B2111/0075—Uses not provided for elsewhere in C04B2111/00 for road construction
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
    • C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Road Paving Structures (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Abstract

The application relates to the field of pavements, and particularly discloses a modified asphalt mixture and a preparation method thereof. The mixture is prepared from the following raw materials in parts by weight: 4-7 parts of modified asphalt, 90-98 parts of aggregate, 8-10 parts of mineral powder and 0.1-0.9 part of fiber stabilizer; the preparation method comprises the following steps: s1, uniformly mixing the aggregate and the mineral powder according to a set proportion, and heating to 190-220 ℃ for later use to obtain a mixture; s2, adding the modified asphalt preheated to 170-175 ℃ into the mixture heated in the S1, keeping stirring at 180 ℃ for 40S, adding the fiber stabilizer, and keeping the temperature at 180 ℃ and stirring for 23-25S to obtain the modified asphalt mixture. The modified asphalt mixture has the advantages of improving the cracking resistance and durability of asphalt.

Description

Modified asphalt mixture and preparation method thereof
Technical Field
The application relates to the field of pavement materials, in particular to a modified asphalt mixture and a preparation method thereof.
Background
The asphalt is a semi-solid or liquid substance which is remained after useful hydrocarbon substances are fractionated in the petroleum processing process and light fractions such as gasoline, kerosene, diesel oil and the like are separated, and vacuum distillate oil is separated by vacuum distillation, and the asphalt is a dark brown complex mixture consisting of hydrocarbons with different molecular weights and non-metallic derivatives thereof, is impermeable to water, is hardly soluble in water, and is a waterproof, moistureproof and anticorrosive organic gelled material. In civil engineering, asphalt is a waterproof material and an anticorrosive material which are widely applied, and is mainly applied to waterproofing of roofs, floors and underground structures and anticorrosion of wood and steel. Meanwhile, the asphalt is also a pavement structure cementing material widely applied in road engineering, and can be matched with mineral materials with different compositions in proportion to build asphalt pavements with different structures, so that the highway is widely applied.
At present, in the period of high-speed development of economy, cars, various small trucks and large trucks are more and more, the traffic pressure is more and more, and the problems of insufficient durability and fatigue cracking of the asphalt pavement are more serious and need to be improved.
Disclosure of Invention
In order to improve the cracking resistance and the durability of asphalt, the application provides a modified asphalt mixture and a preparation method thereof.
In a first aspect, the present application provides a modified asphalt mixture, which adopts the following technical scheme:
the modified asphalt mixture is prepared from the following raw materials in parts by weight: 4-6 parts of modified asphalt, 90-98 parts of aggregate, 8-10 parts of mineral powder and 0.1-0.9 part of fiber stabilizer.
By adopting the technical scheme, the aggregate is adopted to form the framework, then the mineral powder, the modified asphalt and the fiber stabilizer are filled in the gap of the framework, and the framework is cemented together by the asphalt mastic, so that the asphalt mixture has good cracking resistance and durability.
Preferably, the modified asphalt is prepared from the following raw materials in parts by weight: 60 parts of matrix asphalt and 40 parts of composite modifier.
By adopting the technical scheme, the matrix asphalt is modified by the composite modifier, so that the modified asphalt has better high-temperature stability, crack resistance and durability.
Preferably, the base asphalt is 90# asphalt, the penetration at 25 ℃ is 89.3, the ductility at 15 ℃ is more than 100cm, the softening point is 45.4 ℃, the density at 15 ℃ is 1.0093g/cm3, and the wax content is 1.9%.
By adopting the technical scheme, the performance of the asphalt mixture can be effectively controlled by controlling various indexes of the asphalt.
Preferably, the composite modifier is prepared from the following raw materials in parts by weight: 8 parts of polyurethane prepolymer, 2 parts of compatilizer, 18 parts of epoxy resin and 12 parts of curing agent, wherein the curing agent is methyl hexahydrophthalic anhydride, and the compatilizer is maleic anhydride.
By adopting the technical scheme, the Polyurethane (PU) prepolymer is a reactive semi-finished product prepared from isocyanate and polyol according to a certain proportion, and the elasticity of the matrix asphalt can be greatly improved by adding the PU prepolymer, so that the modified asphalt has excellent flexibility and ageing resistance; the epoxy resin (EP) contains unique active polar groups such as epoxy group, ether bond, hydroxyl group and the like, the mechanical property of the matrix asphalt can be effectively improved by adding the epoxy resin, however, the epoxy asphalt has poor flexibility and is easy to brittle failure at low temperature, and the mechanical property of the composite modifier formed by the polyurethane prepolymer and the epoxy resin shows obvious synergistic action through the compatilizer and the curing agent, so that the asphalt pavement formed by the prepared asphalt mixture can improve the low-temperature flexibility of the epoxy asphalt on the basis of having the mechanical property of the epoxy resin asphalt, reduce the generation of cracks on the asphalt pavement and effectively prolong the service life of the asphalt pavement.
Preferably, the modified asphalt is prepared by the following method:
(1) adding a compatilizer and a curing agent into the matrix asphalt according to a set proportion, and then heating to 120-140 ℃ and stirring for 40min to form a blend;
(2) adding the polyurethane prepolymer and the epoxy resin into the blend according to a set proportion, and continuously stirring for 5min to prepare modified asphalt;
(3) and (3) continuously maintaining the modified asphalt in the step (2) for 4 hours at the temperature of 120 ℃ to ensure that the modified asphalt is fully reacted.
By adopting the technical scheme, the polyurethane prepolymer and the epoxy resin form a cross-linked network structure in the matrix asphalt through the compatilizer and the curing agent, simultaneously EP, PU and asphalt molecules are cross-linked with each other, the arrangement structure of the asphalt molecules is changed, and the cohesion of the asphalt is enhanced, so that the modified asphalt has better mechanical property, the integral rigidity of the prepared asphalt mixture is increased, the high-temperature performance is improved, and the possibility of generating asphalt pavement cracks is reduced.
Preferably, the mixture further comprises the following components in parts by weight: 1-3 parts of a nano titanium dioxide/montmorillonite composite material.
By adopting the technical scheme, the nano titanium dioxide/montmorillonite composite material can improve the high-temperature stability of the asphalt mixture. Ultraviolet rays in sunlight can promote the asphalt colloid to generate an oxidative polymerization reaction to generate asphaltene, so that the activity is reduced, the fluidity is poor, and the asphalt mixture is subjected to brittle fracture and cracking. The nanometer titanium dioxide has certain reducibility, and the ultraviolet aging resistance of the asphalt can be improved by utilizing the characteristics of the nanometer titanium dioxide. One of the montmorillonite clay minerals is microscopically in a layered structure, asphalt molecules in the montmorillonite can be more uniformly distributed by doping a certain amount of montmorillonite in the asphalt, air holes in the asphalt mixture are reduced, and the montmorillonite can also be used as a good antioxidant to improve the ultraviolet aging resistance of the asphalt mixture. The montmorillonite improves the viscosity of the asphalt by reducing the diffusion movement in the asphalt, so that the montmorillonite can fix the asphaltene, reduce the rate of oxidizing the asphalt colloid into the asphaltene, slow down the aging and further reduce the generation of cracks.
Preferably, the fiber stabilizer is prepared by mixing the following components in a mass ratio of 1: 3: 2 glass fiber, basalt fiber and brucite fiber.
Through adopting above-mentioned technical scheme, glass fiber is the form of loosing and presents the fibre characteristic, and glass fiber strength is higher, can promote bituminous mixture's tensile strength. The basalt fiber is an environment-friendly inorganic fiber material, is prepared by melting, refining and spinning basalt which is used as a raw material at a high temperature of 1600 ℃, and has good crack resistance, ageing resistance and high temperature resistance. The brucite fiber is a natural alkaline mineral fiber and has good alkali resistance and mechanical property. Three groups of fibers form a synergistic effect, an interwoven network structure can be formed in the asphalt mixture, when the asphalt mixture is subjected to external tensile stress, the network structure can play roles of reinforcing, toughening and crack resistance, the development of cracks of the asphalt mixture is effectively hindered, and the low-temperature crack resistance of the asphalt mixture is improved.
Preferably, the glass fiber is arranged in a hollow manner, and the glass fiber is filled with an epoxy resin/nano silicon dioxide composite material.
By adopting the technical scheme, the nano silicon dioxide can enhance the toughness, the impact strength and the tensile shear strength of the epoxy resin, and simultaneously when the hollow glass fiber is broken due to the tensile force generated by the crack of the asphalt mixture, the flowing epoxy resin/nano silicon dioxide composite material can be coated on the whole surface of the broken hollow glass, so that the strength of the hollow glass fiber is enhanced simultaneously, the hollow glass fiber is added into the asphalt mixture, like a plurality of micro ribs are doped into the asphalt mixture, after the micro ribs are broken, the process of the crack of the asphalt mixture can be inhibited under the enhancement of the epoxy resin/nano silicon dioxide composite material, and the fracture toughness of the asphalt mixture is improved. Meanwhile, the nano-silica has extremely strong pozzolanic activity, micro-aggregate filling effect and crystal nucleus effect, and can increase the compressive strength and durability of the asphalt mixture.
Preferably, the fiber stabilizer is prepared by the following method: weighing epoxy resin, heating and melting, adding a coupling agent and nano silicon dioxide, stirring uniformly, adding hollow glass fiber, carrying out ultrasonic oscillation treatment, cooling to room temperature, adding basalt fiber and brucite fiber, and mixing uniformly to obtain the product.
By adopting the technical scheme, under the condition that the epoxy resin is heated and melted, the silane coupling agent and the nano-silica are added, the silane coupling agent can enable the nano-silica to be uniformly distributed in an integral system of the epoxy resin, so that the nano-silica can fully enhance the toughness, the impact strength and the tensile shear strength of the epoxy resin, then the epoxy resin/nano-silica composite material is injected into hollow glass fibers after ultrasonic oscillation treatment, and then the basalt fibers and the brucite fibers are added and uniformly mixed to prepare the fiber stabilizer.
In a second aspect, the present application provides a method for preparing a modified asphalt mixture, which adopts the following technical scheme:
a preparation method of a modified asphalt mixture comprises the following steps:
s1, uniformly mixing the aggregate and the mineral powder according to a set proportion, and heating to 190-220 ℃ for later use to obtain a mixture;
s2, adding the modified asphalt preheated to 170-175 ℃ into the mixture heated in the S1, keeping stirring at 180 ℃ for 40S, adding the fiber stabilizer, and keeping the temperature at 180 ℃ and stirring for 23-25S to obtain the modified asphalt mixture.
By adopting the technical scheme, the hot-mixing asphalt preparation process is adopted at the temperature of 190-220 ℃, the operation is simple, the energy consumption is reduced, and the uniformity of raw material mixing and the stability of the performance of the asphalt mixture are improved.
In summary, the present application has the following beneficial effects:
1. aggregate is adopted to form a framework, and then mineral powder, modified asphalt and a fiber stabilizer are filled in gaps of the framework, so that the formed asphalt mastic cements the framework together, and the asphalt mixture has good cracking resistance and durability.
2. The mechanical properties of the composite modifier formed by the polyurethane prepolymer and the epoxy resin show obvious synergistic effect through the compatilizer and the curing agent, so that the low-temperature flexibility of the epoxy asphalt can be improved, the generation of cracks on the asphalt pavement can be reduced, and the service life of the asphalt pavement can be effectively prolonged on the basis of the mechanical properties of the epoxy resin asphalt.
3. The nano titanium dioxide/montmorillonite composite material is dispersed in the asphalt mixture, so that the high-temperature stability of the asphalt mixture can be improved.
4. The glass fiber, the basalt fiber and the brucite fiber form a synergistic effect, and can form an interwoven network structure in the asphalt mixture, when the asphalt mixture is subjected to external tensile stress, the network structure can play roles of reinforcing, toughening and crack resistance, so that the development of cracks of the asphalt mixture is effectively hindered, and the low-temperature crack resistance of the asphalt mixture is improved.
Drawings
FIG. 1 is a flow chart of a method provided herein;
Detailed Description
The present application will be described in further detail with reference to the following drawings and examples.
The raw materials in the application are all purchased from the market.
In the application, limestone aggregate is selected as the aggregate, and the crushing value is 15.75 percent, and the polishing value is 43.5 percent. The mineral powder is S95 grade mineral powder, the passing rate of a 0.075mm sieve is more than 82%, the density is 2.802g/cm3, the hydrophilic coefficient is 0.811, and the water content is 0.12%. The matrix asphalt is 90# asphalt, the penetration at 25 ℃ is 89.3, the ductility at 15 ℃ is more than 100cm, the softening point is 45.4 ℃, the density at 15 ℃ is 1.0093g/cm3, and the wax content is 1.9%. The polyurethane prepolymer is polyether polyurethane prepolymer; the epoxy resin is bisphenol A epoxy resin.
Preparation examples of raw materials
Examples of production of modified Pitch
Preparation example 1
The modified asphalt is prepared from the following raw materials in parts by weight: 60 parts of matrix asphalt and 40 parts of composite modifier; the composite modifier is prepared from the following raw materials in parts by weight: 8 parts of polyurethane prepolymer, 2 parts of compatilizer, 18 parts of epoxy resin and 12 parts of curing agent, wherein the curing agent is methyl hexahydrophthalic anhydride, and the compatilizer is maleic anhydride.
The modified asphalt is prepared by the following method:
(1) adding a compatilizer and a curing agent into the matrix asphalt according to a set proportion, heating to 120-140 ℃ at the rotating speed of 3000rpm/min by using a high-speed shearing machine, and stirring for 40min to form a blend;
(2) adding the polyurethane prepolymer and the epoxy resin into the blend according to a set proportion, and continuously stirring for 5min to prepare modified asphalt;
(3) and (3) continuously maintaining the modified asphalt in the step (2) for 4 hours at the temperature of 120 ℃ to ensure that the modified asphalt is fully reacted.
Preparation example of Nano titanium dioxide/montmorillonite composite Material
Preparation example 2
The preparation method of the nano titanium dioxide/montmorillonite composite material comprises the following steps of preparing TiCl4Adding intoTo a 2.0mol/L hydrochloric acid solution, wherein, in mol ratio, TiCl4: HCl 2: 1, diluting to Ti with deionized water4+To 0.8mol/L to give TiCl4A pillaring agent.
Taking prepared TiCl4The pillaring agent is slowly added to the montmorillonite suspension, where TiCl is present4: montmorillonite is 1: 3, montmorillonite suspension solution, montmorillonite: water ═ 1 g: 10ml, stirring for 6 hours, adding ammonia water to adjust the pH value to be between 2 and 4, reacting for 3 hours, centrifuging, washing with absolute ethyl alcohol, filtering, washing with water, drying, and calcining for 2 hours at 500 ℃ to obtain the nano titanium dioxide/montmorillonite composite material.
Preparation example of fiber stabilizer
Preparation example 3
The fiber stabilizer comprises the following components in a mass ratio of 1: 3: 2 glass fiber, basalt fiber and brucite fiber.
The preparation method of the fiber stabilizer comprises the following steps: weighing epoxy resin, heating and melting, keeping the temperature at 100 ℃, adding a coupling agent and nano silicon dioxide, and mixing the following components in parts by weight: coupling agent: nano silica 10: 1: 1, selecting a silane coupling agent as the coupling agent, stirring uniformly, adding hollow glass fiber, cooling to room temperature after ultrasonic oscillation treatment, wherein the outer diameter of the hollow glass fiber is 1mm, the inner diameter is 0.5mm and the length is 6-12mm, the power of ultrasonic is 210W, the frequency of ultrasonic is 18KHz, and then adding basalt fiber and brucite fiber, and uniformly mixing.
Examples
Example 1
The modified asphalt mixture is prepared from the following components in parts by weight: 4 parts of modified asphalt in preparation example 1, 90 parts of aggregate, 10 parts of mineral powder and 0.1 part of fiber stabilizer in preparation example 3.
The preparation method of the modified asphalt mixture comprises the following steps: the method comprises the following steps:
s1, uniformly mixing the aggregate and the mineral powder according to a set proportion, and heating to 190 ℃ for later use to obtain a mixture;
s2, adding the modified asphalt preheated to 170 ℃ into the mixture heated in the S1, stirring for 40S at the temperature of 180 ℃, adding the fiber stabilizer, and stirring for 23S at the temperature of 180 ℃ under the condition of heat preservation to obtain the modified asphalt mixture.
Example 2
The modified asphalt mixture is prepared from the following components in parts by weight: 5 parts of modified asphalt in preparation example 1, 94 parts of aggregate, 9 parts of mineral powder and 0.5 part of fiber stabilizer in preparation example 3.
The preparation method of the modified asphalt mixture comprises the following steps: the method comprises the following steps:
s1, uniformly mixing the aggregate and the mineral powder according to a set proportion, and heating to 205 ℃ for later use to obtain a mixture;
s2, adding the modified asphalt preheated to 173 ℃ into the mixture heated in the S1, keeping stirring at the temperature of 180 ℃ for 40S, adding the fiber stabilizer, and keeping stirring at the temperature of 180 ℃ for 24S to obtain the modified asphalt mixture.
Example 3
The modified asphalt mixture is prepared from the following components in parts by weight: 7 parts of modified asphalt in preparation example 1, 98 parts of aggregate, 8 parts of mineral powder and 0.9 part of fiber stabilizer in preparation example 3.
The preparation method of the modified asphalt mixture comprises the following steps: the method comprises the following steps:
s1, uniformly mixing the aggregate and the mineral powder according to a set proportion, and heating to 220 ℃ for later use to obtain a mixture;
s2, adding the modified asphalt preheated to 175 ℃ into the mixture heated in the S1, keeping stirring for 40S at the temperature of 180 ℃, adding the fiber stabilizer, and keeping the temperature and stirring for 25S at the temperature of 180 ℃ to obtain the modified asphalt mixture.
Example 4
The modified asphalt mixture is prepared from the following components in parts by weight: 7 parts of modified asphalt in preparation example 1, 98 parts of aggregate, 8 parts of mineral powder, 0.9 part of fiber stabilizer in preparation example 3 and 1 part of nano titanium dioxide/montmorillonite composite material in preparation example 2.
The preparation method of the modified asphalt mixture comprises the following steps: the method comprises the following steps:
s1, uniformly mixing the aggregate, the mineral powder and the nano titanium dioxide/montmorillonite composite material according to a set proportion, and heating to 220 ℃ for later use to obtain a mixture;
s2, adding the modified asphalt preheated to 175 ℃ into the mixture heated in the S1, keeping stirring for 40S at the temperature of 180 ℃, adding the fiber stabilizer, and keeping the temperature and stirring for 25S at the temperature of 180 ℃ to obtain the modified asphalt mixture.
Example 5
Example 5 differs from example 4 in that:
the nano titanium dioxide/montmorillonite composite material is 2 parts.
Example 6
Example 6 differs from example 4 in that:
the nano titanium dioxide/montmorillonite composite material is 3 parts.
Comparative example
Comparative example 1
This comparative example differs from example 2 in that: the modified asphalt is replaced by the base asphalt.
Comparative example 2
This comparative example differs from example 2 in that: the fiber stabilizer is only glass fiber.
Comparative example 3
This comparative example differs from example 2 in that: the fiber stabilizer is only basalt fiber.
Comparative example 4
This comparative example differs from example 2 in that: the fiber stabilizer is only brucite fiber.
Comparative example 5
This comparative example differs from example 2 in that: the fiber stabilizer comprises the following components in a mass ratio of 1: 1: 1 glass fiber, basalt fiber and brucite fiber.
Performance test
The asphalt mixtures in the examples and the comparative examples were subjected to pavement performance tests according to JTGE20-2011 test procedure for road engineering asphalt and asphalt mixtures, wherein the test items comprise a track test, a low-temperature trabecular bending test (-10 ℃), a freeze-thaw splitting test and a water immersion Marshall test, and the test results are shown in Table 1.
TABLE 1 Performance test Table for modified asphalt mixtures in examples and comparative examples
Figure BDA0002955185240000071
Figure BDA0002955185240000081
As can be seen from Table 1, the modified asphalt mixture doped with the fiber stabilizer meets the relevant requirements of JTGF40-2004 technical Specification for construction of road asphalt pavement, issued by Ministry of communications, and the indexes such as high-temperature performance, low-temperature performance, water stability and the like of the modified asphalt mixture are obviously higher than those of a common asphalt mixture, which shows that the road performance of the asphalt mixture is superior.
The pavement performance of the embodiments 4-6 is better than that of the embodiment 2, which shows that the nano titanium dioxide/montmorillonite composite material in the application can improve the high-temperature performance, the low-temperature performance and the water stability of the asphalt mixture.
The raw materials of comparative examples 1 to 5 are base asphalt, and compared with example 2, the high-temperature performance, the low-temperature performance and the water stability are all reduced, which shows that the fiber stabilizer in the application can obviously improve the high-temperature performance, the low-temperature performance and the water stability of the asphalt mixture. The asphalt mixture is changed into a space network structure under the action of the glass fiber, the basalt fiber and the brucite fiber, so that the integrity is better, and the high-temperature stability of the asphalt mixture is improved; the glass fiber, the basalt fiber and the brucite fiber still show good tensile strength at a lower temperature, and can play a role in reinforcing when added into the asphalt mixture, so that the toughness of the asphalt mixture is improved, and the low temperature of the asphalt mixture is indirectly increased; the glass fiber, the basalt fiber and the brucite fiber can be attached to the asphalt, so that the gap between the aggregate and the mineral powder is reduced, the asphalt mixture is more compact, and the water stability of the asphalt mixture is 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 (10)

1. The modified asphalt mixture is characterized by being prepared from the following raw materials in parts by weight: 4-7 parts of modified asphalt, 90-98 parts of aggregate, 8-10 parts of mineral powder and 0.1-0.9 part of fiber stabilizer.
2. The modified asphalt mixture according to claim 1, wherein: the modified asphalt is prepared from the following raw materials in parts by weight: 60 parts of matrix asphalt and 40 parts of composite modifier.
3. The modified asphalt mixture according to claim 2, wherein: the matrix asphalt is 90# asphalt, the penetration at 25 ℃ is 89.3, the ductility at 15 ℃ is more than 100cm, the softening point is 45.4 ℃, the density at 15 ℃ is 1.0093g/cm3, and the wax content is 1.9%.
4. The modified asphalt mixture according to claim 2, wherein: the composite modifier is prepared from the following raw materials in parts by weight: 8 parts of polyurethane prepolymer, 2 parts of compatilizer, 18 parts of epoxy resin and 12 parts of curing agent, wherein the curing agent is methyl hexahydrophthalic anhydride, and the compatilizer is maleic anhydride.
5. The modified asphalt mixture according to claim 4, wherein: the modified asphalt is prepared by the following method:
(1) adding a compatilizer and a curing agent into the matrix asphalt according to a set proportion, and then heating to 120-140 ℃ and stirring for 40min to form a blend;
(2) adding the polyurethane prepolymer and the epoxy resin into the blend according to a set proportion, and continuously stirring for 5min to prepare modified asphalt;
(3) and (3) continuously maintaining the modified asphalt in the step (2) for 4 hours at the temperature of 120 ℃ to ensure that the modified asphalt is fully reacted.
6. The modified asphalt mixture according to claim 1, wherein: the mixture also comprises the following components in parts by weight: 1-3 parts of a nano titanium dioxide/montmorillonite composite material.
7. The modified asphalt mixture according to claim 1, wherein: the fiber stabilizer comprises the following components in a mass ratio of 1: 3: 2 glass fiber, basalt fiber and brucite fiber.
8. The modified asphalt mixture according to claim 7, wherein: the glass fiber is arranged in a hollow mode, and epoxy resin/nano silicon dioxide composite materials are filled in the glass fiber.
9. The modified asphalt mixture according to claim 8, wherein: the fiber stabilizer is prepared by the following method: weighing epoxy resin, heating and melting, adding a coupling agent and nano silicon dioxide, stirring uniformly, adding hollow glass fiber, carrying out ultrasonic oscillation treatment, cooling to room temperature, adding basalt fiber and brucite fiber, and mixing uniformly to obtain the product.
10. A method of preparing a modified asphalt mixture according to any one of claims 1 to 9, comprising the steps of:
s1, uniformly mixing the aggregate and the mineral powder according to a set proportion, and heating to 190-220 ℃ for later use to obtain a mixture;
s2, adding the modified asphalt preheated to 170-175 ℃ into the mixture heated in the S1, keeping stirring at 180 ℃ for 40S, adding the fiber stabilizer, and keeping the temperature at 180 ℃ and stirring for 23-25S to obtain the modified asphalt mixture.
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CN113213818A (en) * 2021-06-09 2021-08-06 上海繁荣道路建设工程有限公司 Modified asphalt concrete and preparation method thereof
CN115505276A (en) * 2022-09-29 2022-12-23 厦门新立基股份有限公司 Ultrathin overlay modified asphalt and preparation method thereof
CN115710100A (en) * 2022-12-10 2023-02-24 厦门市政沥青工程有限公司 Micro-overlay asphalt mixture and preparation method thereof
CN116040986A (en) * 2023-02-08 2023-05-02 黄丽萍 Modified asphalt concrete and preparation method thereof
CN117126545A (en) * 2023-08-16 2023-11-28 重庆诚邦路面材料有限公司 Modified composite epoxy asphalt mixture and pavement construction method and equipment

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CN113213818A (en) * 2021-06-09 2021-08-06 上海繁荣道路建设工程有限公司 Modified asphalt concrete and preparation method thereof
CN115505276A (en) * 2022-09-29 2022-12-23 厦门新立基股份有限公司 Ultrathin overlay modified asphalt and preparation method thereof
CN115710100A (en) * 2022-12-10 2023-02-24 厦门市政沥青工程有限公司 Micro-overlay asphalt mixture and preparation method thereof
CN115710100B (en) * 2022-12-10 2023-11-07 厦门市政沥青工程有限公司 Micro-overlay asphalt mixture and preparation method thereof
CN116040986A (en) * 2023-02-08 2023-05-02 黄丽萍 Modified asphalt concrete and preparation method thereof
CN117126545A (en) * 2023-08-16 2023-11-28 重庆诚邦路面材料有限公司 Modified composite epoxy asphalt mixture and pavement construction method and equipment

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Application publication date: 20210430