CN111847973A - Compound double-modified asphalt mixture additive - Google Patents
Compound double-modified asphalt mixture additive Download PDFInfo
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- CN111847973A CN111847973A CN202010662224.4A CN202010662224A CN111847973A CN 111847973 A CN111847973 A CN 111847973A CN 202010662224 A CN202010662224 A CN 202010662224A CN 111847973 A CN111847973 A CN 111847973A
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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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
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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
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/24—Macromolecular compounds
- C04B24/26—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C04B24/2611—Polyalkenes
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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
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/0075—Uses not provided for elsewhere in C04B2111/00 for road construction
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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
- C04B2111/20—Resistance against chemical, physical or biological attack
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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
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/29—Frost-thaw resistance
Abstract
The invention provides a compound double-modified asphalt mixture additive, which takes natural rock asphalt as a main raw material, is assisted by organic high-molecular polymer, water-soluble chitosan, nano diatomite and other raw materials, and achieves the purposes of improving the high-temperature deformation resistance, the water damage resistance and the low-temperature crack resistance of a road modified asphalt composite material through the molecular crosslinking, condensation, association and complexing coordination of the organic high-molecular polymer, the rock asphalt, the chitosan and the nano diatomite.
Description
Technical Field
The invention relates to the technical field of engineering materials, in particular to a compound double-modified asphalt mixture additive.
Background
The composition and structure of the common petroleum asphalt determine that the common petroleum asphalt has poor high-low temperature stability, high temperature flowing tendency, low temperature brittle fracture tendency and insufficient elasticity and aging resistance, and the common petroleum asphalt is difficult to meet the use requirement of high-grade highways. The modification of common petroleum asphalt is the practical requirement of the road petroleum asphalt pavement material. The popularization and application of the modified asphalt composite material for the green and environment-friendly road become necessary roads for building resource-saving and environment-friendly road materials.
The rock asphalt is an asphalt substance generated by petroleum depositing and changing in rock crack for hundreds of millions of years under the comprehensive action of heat, pressure, oxidation, catalyst and microbes, and is a natural solid asphalt with a relatively large molecular weight. The notification about the main technical policy of water route transportation of the printing and issuing highway (the file No. 2014 165) issued by the department of transportation in China 2014 in 8 months encourages the popularization and application of modified asphalt mixtures such as natural rock asphalt. The rock asphalt is used as an asphalt solid substance, has stable property, strong oxidation resistance and strong binding capacity with aggregate, is a natural excellent petroleum-based asphalt modifier, and is already applied to the modification of road petroleum asphalt and the engineering practice application.
However, due to the influence of factors such as production area and source, the natural rock asphalt as a modifier in practice has the disadvantages of insufficient high-temperature deformation resistance and water damage resistance, insufficient low-temperature crack resistance and the like, and too much rock asphalt causes problems of reduced asphalt ductility and the like, so that a novel compound double-modified asphalt mixture additive needs to be developed deeply.
Disclosure of Invention
In order to solve the problems in the background art, the invention provides a compound double-modified asphalt mixture additive which can improve the high-temperature deformation resistance, the water damage resistance and the low-temperature crack resistance of a modified asphalt composite material for roads.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a compound double-modified asphalt mixture additive is prepared from the following raw materials in parts by weight: 50-85 parts of rock asphalt, 1-30 parts of organic high molecular polymer, 1-10 parts of nano diatomite, 1-2 parts of water-soluble chitosan and 1-10 parts of color masterbatch, wherein the organic high molecular polymer is modified polyethylene or polypropylene.
Preferably, the organic high molecular polymer is modified polyethylene or polypropylene.
The organic high molecular polymer is modified polyethylene or polypropylene, and the preparation method of the organic high molecular polymer comprises the following steps: uniformly stirring the polyethylene/polypropylene powder with small molecular weight and 0.005-0.009 weight part of metallocene catalyst, controlling the reaction temperature at 160-260 ℃, reacting for 3-4h, extruding by an extruder to form a strip-shaped mixture, cooling the strip-shaped mixture to normal temperature, cutting and crushing the strip-shaped mixture into small particles to obtain the organic high molecular polymer.
Preferably, the rock asphalt has a natural asphalt content of more than 30%, a softening point of more than 80 ℃, calcium carbonate of more than 30wt%, a flash point temperature of more than 250 ℃, a heating loss of less than 2.0%, a water content of less than 2%, and a maximum particle size of less than 1.5 mm.
Preferably, the chitosan is water-soluble chitosan, the deacetylation degree is more than 80%, and the molecular weight is more than or equal to 100 ten thousand.
Preferably, the particle size of the nano diatomite is 15-100nm, and the content of nano silicon dioxide is more than 90%.
The invention further provides a preparation method of the compound double-modified asphalt mixture additive, which comprises the following steps:
s1, weighing rock asphalt, organic high molecular polymer, nano diatomite, chitosan and color master batch according to the weight parts, crushing the rock asphalt, heating to 30-35 ℃, drying, and sieving to control the maximum particle size of rock asphalt particles to be less than 1.0 mm;
s2, spraying water-soluble chitosan on the surface of the organic high molecular polymer, uniformly mixing, standing for more than 2min, and then mixing with the nano diatomite and the color master batch to obtain a modified auxiliary material;
and S3, stirring and uniformly mixing the rock asphalt processed in the step S1 and the modified auxiliary materials obtained in the step S2 to obtain the compound rock modified asphalt mixture additive.
The invention further provides the application of the compound double-modified asphalt mixture additive in the aspect of preparing asphalt mixtures.
The above-mentioned application, preferably, comprises the steps of:
(1) heating the coarse and fine grade aggregate to 180-190 ℃;
(2) heating the matrix asphalt to 145-155 ℃;
(3) heating an asphalt mixture mixing container to 150-170 ℃;
(4) Adding the aggregate heated to 180 ℃ and 190 ℃ into an asphalt mixture mixing container for dry mixing for 30-120 s;
(5) adding the compound double-modified asphalt mixture additive with the dosage of 1-2% of the mass of the asphalt mixture into an asphalt mixture mixing container, and dry-mixing for 60-240 s;
(6) quantitatively adding the matrix asphalt heated to 145-155 ℃ into an asphalt mixture mixing container to be stirred for 80-300s, and controlling the oil-stone ratio to be 3.5-5%;
(7) adding the mineral powder into an asphalt mixture mixing container, mixing for 80-240s, and keeping the temperature at 150 ℃ and 170 ℃ in the mixing process to obtain the asphalt mixture.
The compound double-modified asphalt mixture additive is compounded by adding an organic high molecular polymer, nano diatomite, water-soluble chitosan and rock asphalt, wherein the organic high molecular polymer is one of polyethylene and polypropylene. Wherein:
organic high molecular polymer: the organic high molecular polymer can generate molecular crosslinking condensation association and complexing coordination with rock asphalt, chitosan and nano diatomite, accelerates the copolymerization crosslinking grafting of micromolecule free components in the asphalt and the high molecular polymer to form an interlocking interpenetrating grid continuous phase, and is blended, melted and polymerized to form an organic-inorganic hybrid high polymer elastomer, so that the aim of double modification of aggregate and matrix asphalt is fulfilled, and the comprehensive aims of strengthening, toughening and ageing resistance of the asphalt mixture are fulfilled.
Water-soluble chitosan: the water-soluble chitosan can be blended with rock asphalt and matrix asphalt to be melted and polymerized to obtain a high-molecular graft copolymer, the crosslinking condensation polymerization effect is enhanced, the oxidation resistance and stability of the asphalt mixture can be further improved, and the amino in the chitosan interacts with metal elements in the asphalt mixture and nano diatomite, so that the comprehensive performances of the asphalt mixture such as high-temperature deformation resistance, water damage resistance, ageing resistance, ductility and the like can be better improved.
Nano diatomite: the nano material has specific surface effect, small-size effect, quantum size effect and macroscopic quantum tunneling effect, can be used for carrying out composite modification on asphalt, can improve the road performance of the asphalt, and can reduce the asphalt-stone ratio due to the fact that the rock asphalt contains a certain amount of natural asphalt, save the cost, save the energy and reduce the emission; the nano diatomite can exert a nano size effect and can interact with organic high molecular polymers, color master batches, rock asphalt and matrix asphalt, so that the comprehensive performances of the asphalt mixture, such as high-temperature deformation resistance, water loss resistance, ageing resistance, ductility and the like, are improved.
Although polyethylene or polypropylene can be copolymerized, crosslinked and grafted with rock asphalt, nano diatomite and asphalt, the dissolution temperature is relatively high, the comprehensive mechanical properties are insufficient, and particularly, the mechanical properties of modified polyethylene or polypropylene can be obviously improved by the catalytic reaction of metallocene catalyst, so that the impact resistance, the heat resistance and the ultraviolet resistance are improved.
The invention takes natural rock asphalt as a main raw material, is assisted by organic high molecular polymer, water-soluble chitosan, nano diatomite and other raw materials, adopts the construction of an externally-doped direct-throwing type, and in the process of heating and mixing, the organic high molecular polymer, the rock asphalt, the chitosan and the nano diatomite generate molecular crosslinking condensation association and complexing coordination, so that the copolymerization crosslinking grafting of small molecular free components in the asphalt and the high molecular polymer is accelerated, an interlocked interpenetrating grid continuous phase is formed, and the organic-inorganic hybrid high polymer elastomer is formed by blending, melting and polymerization, thereby achieving the purpose of double modification of aggregate and matrix asphalt and achieving the comprehensive purposes of strengthening, toughening and anti-aging of the asphalt mixture. The additive also increases the adhesiveness of the aggregate surface, fills gaps among the aggregates, forms a more compact framework structure, and effectively improves the elasticity, the adhesiveness and the rigidity of the asphalt mixture, thereby obviously improving the high-temperature deformation resistance, the low-temperature crack resistance and the water damage resistance of the compound rock modified asphalt mixture.
The compound double-modified asphalt mixture additive is applied to asphalt modification, achieves remarkable effect in the paving of solid asphalt roads in China, and has various indexes superior to the standard of the department of transportation, wherein the high-temperature anti-rutting performance of the compound double-modified asphalt mixture is improved by 3 times compared with the standard of the department of transportation (JT/T860.5-2014), the dynamic stability can reach 10000 times/mm on average, and the soaking Marshall residual stability and the freeze-thaw splitting strength of the compound rock modified asphalt mixture are improved by more than 20% compared with the standard JT/T860.5-2014 of the department of transportation, and are more excellent and more remarkable than the performance of the same product. The complex double-modified asphalt mixture additive adopts the most advanced 'external-doping direct-throwing' construction, is beneficial to reducing electricity and oil consumption, reduces the aging phenomenon of repeated heating of asphalt, does not contain wax, improves the quality of high-wax-content asphalt, and solves the current situations of complexity and high energy consumption of the traditional SBS modified asphalt production.
Because the compound double-modified asphalt mixture additive product contains a certain amount of natural asphalt, when the additive product is used for modifying asphalt, the dosage of the asphalt is reduced by 10 to 15 percent compared with the conventional dosage. The asphalt road paved by the modified asphalt of the compound rock modified asphalt mixture can be completely made of domestic asphalt without adding anti-rutting agent products, and the situation that China depends on expensive imported asphalt and anti-rutting agent products for a long time to build roads is ended.
Detailed Description
The present invention is further described with reference to the following examples, but the present invention is not limited to the scope of the examples, and any modifications or changes that can be easily made by those skilled in the art without departing from the technical solution of the present invention will fall within the scope of the claims of the present invention.
Table 1 raw material ratio of compound double-modified asphalt mixture additive
The methods for producing the modified polyethylene I, modified polyethylene II, modified polyethylene III, modified polypropylene I, modified polypropylene II and modified polypropylene III are shown in examples 9 to 10, examples 17 to 18 and examples 21 to 22.
Example 9
The preparation method of the modified polyethylene I comprises the following steps:
the preparation method of the modified polyethylene I comprises the following steps: uniformly stirring the polyethylene powder with small molecular weight and 0.008 part by weight of metallocene catalyst, controlling the reaction temperature at 160-260 ℃, reacting for 3 hours, extruding by an extruder to form a strip-shaped mixture, cooling the strip-shaped mixture to normal temperature, cutting and crushing into small particles to obtain the modified polyethylene I.
Example 10
The preparation method of the modified polyethylene II comprises the following steps: uniformly stirring the polyethylene powder with small molecular weight and 0.005 part by weight of metallocene catalyst, controlling the reaction temperature at 160-260 ℃, reacting for 4 hours, extruding the mixture by an extruder to form a strip-shaped mixture, cooling the strip-shaped mixture to normal temperature, cutting and crushing the strip-shaped mixture into small particles to obtain the modified polyethylene II.
Example 17
The preparation method of the modified polyethylene III comprises the following steps: uniformly stirring the polyethylene powder with small molecular weight and 0.005 part by weight of metallocene catalyst, controlling the reaction temperature at 160-260 ℃, reacting for 4 hours, extruding the mixture by an extruder to form a strip-shaped mixture, cooling the strip-shaped mixture to normal temperature, cutting and crushing the mixture into small particles to obtain the modified polyethylene III.
Example 18
The preparation method of the modified polypropylene I comprises the following steps: uniformly stirring the small-molecular-weight polypropylene powder and 0.007 part by weight of metallocene catalyst, controlling the reaction temperature at 160-.
Example 21
The preparation method of the modified polypropylene II comprises the following steps: uniformly stirring the small-molecular-weight polypropylene powder and 0.006 part by weight of metallocene catalyst, controlling the reaction temperature at 160-260 ℃, reacting for 3 hours, extruding the mixture by an extruder to form a strip-shaped mixture, cooling the strip-shaped mixture to the normal temperature, cutting and crushing the cooled strip-shaped mixture into small particles to obtain the modified polypropylene II.
Example 22
The preparation method of the modified polypropylene III comprises the following steps: uniformly stirring the small-molecular-weight polypropylene powder and 0.008 part by weight of metallocene catalyst, controlling the reaction temperature to be 160-260 ℃, extruding the mixture through an extruder to form a strip-shaped mixture after the reaction is carried out for 3 hours, and cutting and crushing the strip-shaped mixture into small particles after the strip-shaped mixture is cooled to the normal temperature to obtain the modified polypropylene III.
The preparation method of the compound double-modified asphalt mixture additive comprises the following steps: s1, weighing rock asphalt, organic high molecular polymer, nano diatomite, chitosan and color master batch according to the weight parts, crushing the rock asphalt, heating to 30-35 ℃, drying, and sieving to control the maximum particle size of rock asphalt particles to be less than 1.0 mm; s2, spraying water-soluble chitosan on the surface of the organic high molecular polymer, uniformly mixing, standing for more than 2min, and then mixing with the nano diatomite and the color master batch to obtain a modified auxiliary material; and S3, stirring and uniformly mixing the rock asphalt processed in the step S1 and the modified auxiliary materials obtained in the step S2 to obtain the compound rock modified asphalt mixture additive.
The raw material components require that:
rock asphalt: black brown powder, natural asphalt content is more than 30%, softening point is more than 80 ℃, calcium carbonate is more than 30wt%, flash point temperature is more than 250 ℃, heating loss is less than 2.0%, water content is less than 2%, and maximum particle size of particles is less than 1.5 mm. This example uses rock bitumen purchased from Qingdao American Union energy Co.
Water-soluble chitosan: the deacetylation degree is more than 80 percent, and the molecular weight is more than or equal to 100 ten thousand. This example uses chitosan purchased from Shanghai Luo's biosciences, Inc.
Nano diatomite: the grain diameter is 15-100nm, and the content of the nano silicon dioxide is more than 90%. This example used nano diatomaceous earth purchased from collected mineral products ltd, lingshou county.
Color masterbatch: the maximum particle size of the particles is less than 1.0 mm. This example uses a color masterbatch purchased from Shenzhen Weichang pigment Limited.
Polyethylene: the polymerization degree is less than 3000. This example uses polyethylene purchased from Shanghai Bighanda chemical Co., Ltd.
Polypropylene: the degree of polymerization is less than 4500. This example uses polypropylene purchased from Shanghai Bighanda chemical Co., Ltd.
The compound double-modified asphalt mixture additive of the embodiments 1 to 8 and 25 to 31 is used for modified asphalt, and specifically comprises the following steps: (1) heating the coarse and fine grade aggregate to 190 ℃; (2) heating the base asphalt to 150 ℃; (3) heating an asphalt mixture mixing container to 170 ℃; (4) adding the aggregate heated to 190 ℃ into an asphalt mixture mixing container and dry-mixing for 30 s; (5) adding the compound rock modified asphalt mixture additive with the dosage of 1 percent of the mass of the asphalt mixture into an asphalt mixture mixing container, and dry-mixing for 90 s; (6) quantitatively adding the matrix asphalt heated to 150 ℃ into an asphalt mixture mixing container, and stirring for 90s, wherein the oil-stone ratio is controlled to be 4.2-4.5%; (7) adding the mineral powder into an asphalt mixture mixing container, mixing for 90s, and keeping the temperature at 165-170 ℃ in the mixing process to obtain the asphalt mixture.
The compound double-modified asphalt mixture additive of the embodiment 9-24 is used for modified asphalt, and specifically comprises the following steps: (1) heating the coarse and fine grade aggregate to 180 ℃; (2) heating the base asphalt to 145 ℃; (3) heating an asphalt mixture mixing container to 155 ℃; (4) adding the aggregate heated to 180 ℃ into an asphalt mixture mixing container and dry-mixing for 30 s; (5) adding the compound rock modified asphalt mixture additive with the dosage of 1 percent of the mass of the asphalt mixture into an asphalt mixture mixing container, and dry-mixing for 90 s; (6) quantitatively adding the matrix asphalt heated to 145 ℃ into an asphalt mixture mixing container, and stirring for 80s, wherein the oil-stone ratio is controlled to be 3.9-4.3%; (7) adding the mineral powder into an asphalt mixture mixing container, mixing for 90s, and keeping the temperature at 150 ℃ and 155 ℃ in the mixing process to obtain the asphalt mixture.
In the asphalt mixture, the weight ratio of the aggregate, the matrix asphalt and the mineral powder is as follows: aggregate 80-85 parts, matrix asphalt 5.5-6.5 parts, mineral powder 4.5-5.5 parts; wherein the aggregate is natural aggregate, including broken stone and river sand; the mineral powder is limestone mineral powder; the matrix asphalt is petroleum asphalt.
And (3) carrying out test piece molding on the mixed asphalt mixture according to the compaction temperature. According to a test method of T0702-2011 and T0709-2011 in road engineering asphalt and asphalt mixture test specification JTGE20-2011, a Marshall test piece is formed by adopting an optimal oilstone ratio, and a water-soaking Marshall test is carried out. According to a test method of T0702-2011 in road engineering asphalt and asphalt mixture test regulation JTGE20-2011, a Marshall test piece is molded by compacting 50 times on two sides of the optimal oilstone ratio respectively, and a freeze-thaw splitting test is carried out according to a method of T0729-2000. According to a test method of T0719-2011 in road engineering asphalt and asphalt mixture test specification JTGE20-2011, a rutting test is carried out under the conditions that the test temperature is 60 +/-1 ℃ and the load wheel pressure is 0.7 +/-0.05 MPa, and the high-temperature stability performance of the mixture is tested. The results are shown in Table 2.
Table 2 test results of test pieces made of modified asphalt mixtures according to examples
Claims (8)
1. The compound double-modified asphalt mixture additive is characterized by being prepared from the following raw materials in parts by weight: 50-85 parts of rock asphalt, 1-30 parts of organic high molecular polymer, 1-10 parts of nano diatomite, 1-2 parts of water-soluble chitosan and 1-10 parts of color masterbatch, wherein the organic high molecular polymer is polyethylene or polypropylene.
2. The additive for the compounded double-modified asphalt mixture according to claim 1, wherein the organic high molecular polymer is modified polyethylene or polypropylene, and the preparation method of the organic high molecular polymer comprises the following steps: uniformly stirring the polyethylene/polypropylene powder with small molecular weight and 0.005-0.009 weight part of metallocene catalyst, controlling the reaction temperature at 160-260 ℃, reacting for 3-4h, extruding by an extruder to form a strip-shaped mixture, cooling the strip-shaped mixture to normal temperature, cutting and crushing the strip-shaped mixture into small particles to obtain the organic high molecular polymer.
3. The additive for the compound double-modified asphalt mixture according to claim 1, wherein the rock asphalt contains more than 30% of natural asphalt, has a softening point of more than 80 ℃, 30wt% of calcium carbonate, a flash point temperature of more than 250 ℃, a heating loss of less than 2.0%, a water content of less than 2%, and a maximum particle size of less than 1.5 mm.
4. The additive for the compound double-modified asphalt mixture as claimed in claim 1, wherein the degree of deacetylation of the water-soluble chitosan is more than 80%, and the molecular weight of the water-soluble chitosan is more than or equal to 100 ten thousand.
5. The compound double-modified asphalt mixture additive as claimed in claim 1, wherein the nano diatomite has a particle size of 15-100nm and a nano silica content of > 90%.
6. The preparation method of the compound double-modified asphalt mixture additive as defined in any one of claims 1 to 5, which is characterized by comprising the following steps:
s1, weighing rock asphalt, an organic high-molecular polymer, nano diatomite, water-soluble chitosan and a color master batch in parts by weight, crushing the rock asphalt, heating to 30-35 ℃, drying, and sieving to control the maximum particle size of rock asphalt particles to be less than 1.0 mm;
s2, spraying water-soluble chitosan on the surface of the organic high molecular polymer, uniformly mixing, standing for more than 2min, and then mixing with nano diatomite and a color master batch to obtain a modified auxiliary material;
and S3, stirring and uniformly mixing the rock asphalt processed in the step S1 and the modified auxiliary material obtained in the step S2 to obtain the compound double-modified asphalt mixture additive.
7. The application of the compound double-modified asphalt mixture additive disclosed by any one of claims 1 to 5 in the aspect of preparing asphalt mixtures.
8. Use according to claim 7, characterized in that it comprises the following steps:
(1) heating the coarse and fine grade aggregate to 180-190 ℃;
(2) heating the matrix asphalt to 145-155 ℃;
(3) heating an asphalt mixture mixing container to 150-170 ℃;
(4) adding the aggregate heated to 180 ℃ and 190 ℃ into an asphalt mixture mixing container for dry mixing for 30-120 s;
(5) adding the compound rock modified asphalt mixture additive with the dosage of 1-2% of the mass of the asphalt mixture into an asphalt mixture mixing container, and dry-mixing for 60-240 s;
(6) quantitatively adding the matrix asphalt heated to 145-155 ℃ into an asphalt mixture mixing container to be stirred for 80-300s, and controlling the oil-stone ratio to be 3.5-5%;
(7) adding the mineral powder into an asphalt mixture mixing container, mixing for 80-240s, and keeping the temperature at 150 ℃ and 170 ℃ in the mixing process to obtain the asphalt mixture.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113683339A (en) * | 2021-09-03 | 2021-11-23 | 广西路冠科技投资发展有限责任公司 | Compound natural rock modified asphalt mixture additive |
| CN113735483A (en) * | 2021-09-03 | 2021-12-03 | 广西路冠科技投资发展有限责任公司 | Nano composite natural rock modified asphalt mixture additive |
| CN113736271A (en) * | 2021-09-03 | 2021-12-03 | 广西路冠科技投资发展有限责任公司 | Compound double-modified asphalt mixture additive and preparation method thereof |
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