CN112679146A - High-temperature-resistant and anti-rutting asphalt mixture - Google Patents
High-temperature-resistant and anti-rutting asphalt mixture Download PDFInfo
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- CN112679146A CN112679146A CN202110092526.7A CN202110092526A CN112679146A CN 112679146 A CN112679146 A CN 112679146A CN 202110092526 A CN202110092526 A CN 202110092526A CN 112679146 A CN112679146 A CN 112679146A
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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
- C04B26/30—Compounds having one or more carbon-to-metal or carbon-to-silicon linkages ; Other silicon-containing organic compounds; Boron-organic compounds
- C04B26/32—Compounds having one or more carbon-to-metal or carbon-to-silicon linkages ; Other silicon-containing organic compounds; Boron-organic compounds containing silicon
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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Abstract
The invention discloses a high-temperature-resistant and anti-rutting asphalt mixture, which comprises the following raw materials in parts by weight: by weight, 15-18 parts of pretreated asphalt, 30-35 parts of zinc chloride, 5-10 parts of heat conducting material, 8-12 parts of glass fiber, 5-10 parts of admixture and 90-100 parts of aggregate; the pretreated asphalt comprises the following raw materials in parts by weight: 8-14 parts of modified asphalt, 6-8 parts of dihydroxyl terminated polydimethylsiloxane, 14-16 parts of polycaprolactone diol, 2-4 parts of 1, 6-hexamethylene diisocyanate, 0.5-1 part of dibutyltin dilaurate, 4 '-dimethyl-2, 2' -bipyridine and 0.5-0.8 part of 1, 4-butanediol. The invention has reasonable process design and proper component proportion, the prepared asphalt mixture has excellent anti-rutting capability, and the high temperature stability and the water stability of the asphalt mixture are both improved, thus the asphalt mixture can be applied to roads with large traffic volume and more heavy-load and overloaded vehicles and has higher practicability.
Description
Technical Field
The invention relates to the technical field of asphalt mixtures, in particular to a high-temperature-resistant and anti-rutting asphalt mixture.
Background
The asphalt mixture is a composite material, mainly comprising asphalt, coarse aggregate, fine aggregate, mineral powder, and optionally polymer and wood cellulose; the materials with different qualities and quantities are mixed to form different structures and have different mechanical properties; the material is widely applied to road traffic and house construction of various cities.
However, the existing asphalt pavement is exposed outdoors for a long time, the aging of the asphalt mixture can be caused by factors such as temperature change, ultraviolet radiation and the like, and meanwhile, higher requirements on the high-temperature stability and the anti-rutting performance of the asphalt mixture are provided.
Aiming at the problem, a high-temperature-resistant and anti-rutting asphalt mixture and a preparation method thereof are designed, which are technical problems to be urgently solved.
Disclosure of Invention
The invention aims to provide a high-temperature-resistant and anti-rutting asphalt mixture and a preparation method thereof, and aims to solve the problems in the prior art.
In order to achieve the purpose, the invention provides the following technical scheme:
the high-temperature-resistant and anti-rutting asphalt mixture comprises the following raw materials: by weight, 15-18 parts of pretreated asphalt, 30-35 parts of zinc chloride, 5-10 parts of heat conducting material, 8-12 parts of glass fiber, 5-10 parts of admixture and 90-100 parts of aggregate.
According to an optimized scheme, the raw materials of each component of the pretreated asphalt comprise: 8-14 parts of modified asphalt, 6-8 parts of dihydroxyl terminated polydimethylsiloxane, 14-16 parts of polycaprolactone diol, 2-4 parts of 1, 6-hexamethylene diisocyanate, 0.5-1 part of dibutyltin dilaurate, 4 '-dimethyl-2, 2' -bipyridine and 0.5-0.8 part of 1, 4-butanediol.
According to an optimized scheme, the modified asphalt comprises the following raw materials in parts by weight: 5-7 parts of epoxy resin, 6-8 parts of polyurethane, 8-10 parts of matrix asphalt, 5-7 parts of curing agent and 10-14 parts of porous additive.
According to an optimized scheme, the porous additive comprises the following raw materials in parts by weight: 8-10 parts of modified polystyrene, 8-10 parts of triethyl aluminum, 10-20 parts of toluene, 2-4 parts of levorotatory lactide and 10-25 parts of absolute ethyl alcohol.
According to an optimized scheme, the modified polystyrene is prepared from an initiator, a catalyst, 1,4,7,10, 10-hexamethyltriethylenetetramine, styrene, toluene and alumina; the initiator is prepared from 2-bromine isobutyryl bromide, diethyl ether and ethylene glycol.
According to an optimized scheme, the heat conducting material is prepared from aluminum nitrate, boric acid, melamine and composite molten salt; the composite molten salt comprises sodium chloride and potassium chloride, wherein the mass ratio of the sodium chloride to the potassium chloride is 1: 1.
according to an optimized scheme, the admixture comprises mineral powder, silica fume and fly ash, wherein the mass ratio of the mineral powder to the silica fume to the fly ash is 1: 2: (1-1.5).
In an optimized scheme, the curing agent is an amine curing agent; the catalyst is cuprous bromide.
According to an optimized scheme, the preparation method of the high-temperature-resistant and anti-rutting asphalt mixture comprises the following steps:
1) preparing materials;
2) preparation of the porous additive:
a) dissolving 2-bromine isobutyryl bromide in diethyl ether to obtain a solution A; dissolving ethylene glycol and diethyl ether, stirring, placing in an ice-water bath, slowly dropwise adding the solution A, and stirring at room temperature to obtain an initiator;
b) mixing and stirring an initiator, a catalyst, 1,4,7,10, 10-hexamethyl triethylene tetramine and styrene, freezing, vacuumizing, heating in a nitrogen environment until the materials are dissolved, heating for 7-7.5 hours in an oil bath at the temperature of 110 ℃ and 115 ℃, adding toluene and alumina, continuing stirring, adding ethanol, collecting precipitate, and drying in vacuum to obtain modified polystyrene;
c) dissolving modified polystyrene in toluene, adding a toluene solution of triethylaluminum, stirring, adding levorotatory lactide in a nitrogen environment, continuously freezing, vacuumizing, heating until the materials are dissolved, reacting at 90-95 ℃ for 6-7h, adding absolute ethyl alcohol, collecting precipitate, and drying in vacuum to obtain a material B;
d) dissolving the material B with dichloromethane, standing until the dichloromethane is completely volatilized, placing in a mixed solution of sodium hydroxide and ethanol, and stirring at 65-68 ℃ for 7-8 days to obtain a porous additive;
3) preparing a heat conducting material: taking aluminum nitrate, boric acid and melamine, mixing and stirring, adding composite molten salt, and performing microwave heating to prepare a heat conducting material;
4) preparation of pretreated asphalt:
a) taking epoxy resin, adding polyurethane and matrix asphalt, carrying out ultrasonic treatment for 10-15min, carrying out mixed shearing for 3-5min, adding a curing agent, carrying out mixed shearing for 3-5min, adding a porous additive, standing, heating at the temperature of 150-;
b) dissolving dihydroxy-terminated polydimethylsiloxane, polycaprolactone diol and tetrahydrofuran, heating to 50 ℃, stirring, adding modified asphalt, continuing to stir, adding 1, 6-hexamethylene diisocyanate and dibutyltin dilaurate, reacting under argon atmosphere, continuing to add 4,4 '-dimethyl-2, 2' -bipyridine, heating to 60-62 ℃, reacting, adding 1, 4-butanediol, and continuing to react to obtain pretreated asphalt;
5) dissolving the pretreated asphalt in tetrahydrofuran, adding zinc chloride, stirring at 50-55 ℃, adding the heat-conducting material, the aggregate and the glass fiber, stirring at 100-110 ℃, adding the admixture, and continuously stirring to obtain the asphalt mixture.
The optimized scheme comprises the following steps:
1) preparing materials;
2) preparation of the porous additive:
a) dissolving 2-bromine isobutyryl bromide in diethyl ether, and stirring for 10-20min to obtain solution A; dissolving ethylene glycol and diethyl ether, stirring for 10-20min, placing in ice water bath, slowly dropwise adding the solution A, and stirring at room temperature for 16-20h to obtain initiator;
b) mixing and stirring an initiator, a catalyst, 1,4,7,10, 10-hexamethyl triethylene tetramine and styrene for 10-20min, freezing, vacuumizing, heating in a nitrogen environment until the materials are dissolved, heating in an oil bath at the temperature of 110 ℃ and 115 ℃ for 7-7.5h, adding toluene and alumina, continuously stirring for 15-20min, adding ethanol, collecting the precipitate, and drying in vacuum at the temperature of 60 ℃ to obtain modified polystyrene;
c) dissolving modified polystyrene and toluene, adding a toluene solution of triethylaluminum, stirring for 12-14h, adding levorotatory lactide in a nitrogen environment, continuously freezing, vacuumizing for 5-7min, heating until the materials are dissolved, reacting for 6-7h at 90-95 ℃, adding absolute ethyl alcohol, collecting precipitates, and vacuum-drying for 24h at 50 ℃ to obtain a material B;
d) dissolving the material B with dichloromethane, standing until the dichloromethane is completely volatilized, placing in a mixed solution of sodium hydroxide and ethanol, and stirring at 65-68 ℃ for 7-8 days to obtain a porous additive;
3) preparing a heat conducting material: mixing and stirring aluminum nitrate, boric acid and melamine for 5-8min, adding the composite molten salt, and heating by microwave for 40-60min to obtain a heat conducting material;
4) preparation of pretreated asphalt:
a) taking epoxy resin, adding polyurethane and matrix asphalt, carrying out ultrasonic treatment for 10-15min, mixing and shearing at the rotating speed of 100-;
b) dissolving dihydroxy-terminated polydimethylsiloxane, polycaprolactone diol and tetrahydrofuran, heating to 50 ℃, stirring for 5-10min, adding modified asphalt, continuing to stir for 10-15min, adding 1, 6-hexamethylene diisocyanate and dibutyltin dilaurate, reacting for 24h under the argon atmosphere, continuing to add 4,4 '-dimethyl-2, 2' -bipyridyl, heating to 60-62 ℃, reacting for 24h, adding 1, 4-butanediol, and continuing to react for 20-24h to obtain pretreated asphalt;
5) dissolving the pretreated asphalt in tetrahydrofuran, adding zinc chloride, stirring at 50-55 ℃ for 5-6h, adding the heat-conducting material, the aggregate and the glass fiber, stirring at 100-110 ℃ for 1-1.5h, adding the admixture, and continuously stirring for 2-3min to obtain the asphalt mixture.
Compared with the prior art, the invention has the beneficial effects that:
the invention discloses a high-temperature-resistant and anti-rutting asphalt mixture and a preparation method thereof, wherein the asphalt mixture comprises components such as pretreated asphalt, heat-conducting materials, aggregates, glass fibers, admixtures and the like, and the glass fibers have good stability and dispersibility, can be adsorbed on the surfaces of the components of the asphalt mixture, and greatly improve the cracking resistance and other mechanical properties of the asphalt mixture; the invention designs pretreated asphalt which comprises components such as modified asphalt and dihydroxy terminated polydimethylsiloxane, and when in preparation, the dihydroxy terminated polydimethylsiloxane, polycaprolactone diol, 4 '-dimethyl-2, 2' -bipyridyl and the like are used for preparing multi-block polyurethane taking polycaprolactone, polydimethylsiloxane and bipyridyl groups as blocks, and the multi-block polyurethane and the modified asphalt are mutually wound;
when the pre-treated asphalt is used for preparing the asphalt mixture, the pre-treated asphalt is mixed with zinc chloride to generate a combination reaction, and bipyridyl groups and Zn in the multi-block polyurethane2+The combination can be wrapped in a polycaprolactone block of polyurethane through reaction and combination, so that the polyurethane elastomer has stable mechanical property at high temperature, and the dynamic reversible supermolecule interaction between the elastomer chain segments endows the asphalt mixture with good self-repairing and recycling performance, and further improves the mechanical property and the anti-rutting property of the asphalt mixture.
The modified asphalt comprises components such as epoxy resin, polyurethane, matrix asphalt, porous additive and the like, in the preparation process, the epoxy resin and the polyurethane are compounded to form a cross-linked interpenetrating network, and the matrix asphalt is modified by using the cross-linked interpenetrating network so as to improve the mechanical property and the ageing resistance of the matrix asphalt, meanwhile, the interpenetrating network can be combined with a multi-block polyurethane box generated by subsequent reaction, so that the compactness among the components of the asphalt mixture is further improved, the cohesiveness of the asphalt mixture is improved, and the mechanical property and the anti-rutting property of the asphalt mixture are improved.
Meanwhile, a porous additive is added, and the porous additive comprises modified polystyrene, triethylaluminum, toluene, levorotatory lactide and other components, during preparation, a double-end initiator is prepared by 2-bromoisobutyryl bromide and ethylene glycol to initiate styrene polymerization to prepare hydroxyl-terminated polystyrene, the levorotatory lactide is subjected to ring opening polymerization reaction to form modified polystyrene (polystyrene-b-poly-levorotatory lactic acid block copolymer), and ester groups on a polylactic acid molecular chain are hydrolyzed under the action of alkali to form a porous polymer, namely the porous additive; the porous additive has rich porous structure and specific surface area, can effectively adsorb light components in the asphalt mixture so as to improve the high-temperature stability of the asphalt mixture, and can also improve the interface strength among the components of the asphalt mixture so as to improve the anti-rutting performance of the asphalt mixture; meanwhile, in the process of adding the porous additive into the matrix asphalt and preparing the modified asphalt, primary amine and secondary amine contained in the porous additive can perform ring opening action with epoxy resin to form hydroxyl, and the hydroxyl and an epoxy group which is not subjected to ring opening perform etherification reaction, so that crosslinking is performed, the compactness among the components of the asphalt mixture is further improved, and the anti-rutting performance of the asphalt mixture is improved.
The heat-conducting material is also added, the heat-conducting material is a mixture of the flaky hexagonal boron nitride and the flaky alumina, both the flaky hexagonal boron nitride and the flaky alumina have hexagonal flaky structures and have large heat conductivity coefficients, and the heat-conducting material is added into the asphalt mixture, so that the temperature regulation effect can be achieved, the heating rate of the asphalt mixture in a high-temperature environment can be effectively reduced, and the high-temperature stability of the asphalt mixture can be effectively improved.
The invention discloses a high-temperature-resistant and anti-rutting asphalt mixture and a preparation method thereof, the process design is reasonable, the component proportion is proper, the prepared asphalt mixture has excellent anti-rutting capability, the high-temperature stability and the water stability of the asphalt mixture are improved, and the asphalt mixture can be applied to roads with large traffic volume and more heavy-load and overloaded vehicles and has higher practicability.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1:
s1: preparing materials;
s2: preparation of the porous additive:
dissolving 2-bromine isobutyryl bromide in diethyl ether, and stirring for 10min to obtain solution A; dissolving ethylene glycol and diethyl ether, stirring for 10min, placing in an ice water bath, slowly dropwise adding the solution A, and stirring at room temperature for 16h to obtain an initiator;
taking an initiator, a catalyst, 1,4,7,10, 10-hexamethyl triethylene tetramine and styrene, mixing and stirring for 10min, freezing, vacuumizing, heating in a nitrogen environment until the materials are dissolved, then placing in an oil bath at 110 ℃ for heating for 7h, adding toluene and alumina, continuing stirring for 15min, adding ethanol, collecting precipitates, and drying in vacuum at 60 ℃ to obtain modified polystyrene;
dissolving modified polystyrene in toluene, adding a toluene solution of triethylaluminum, stirring for 12h, adding levorotatory lactide in a nitrogen environment, continuously freezing, vacuumizing for 5min, heating until the materials are dissolved, reacting at 90 ℃ for 6h, adding absolute ethyl alcohol, collecting precipitate, and vacuum-drying at 50 ℃ for 24h to obtain a material B; dissolving the material B with dichloromethane, standing until the dichloromethane is completely volatilized, placing the material B into a mixed solution of sodium hydroxide and ethanol, and stirring for 7d at 65 ℃ to obtain a porous additive;
s3: preparing a heat conducting material:
mixing and stirring aluminum nitrate, boric acid and melamine for 5min, adding the composite molten salt, and heating for 40min by microwave to obtain a heat conducting material;
s4: preparation of pretreated asphalt:
taking epoxy resin, adding polyurethane and matrix asphalt, carrying out ultrasonic treatment for 10min, mixing and shearing at the rotating speed of 100r/min for 3min, adding a curing agent, mixing and shearing at the rotating speed of 500r/min for 3min, adding a porous additive, standing for 6h, heating at 150 ℃ for 1h, adding tetrahydrofuran, and continuously stirring for 20min to obtain modified asphalt;
dissolving dihydroxy-terminated polydimethylsiloxane, polycaprolactone diol and tetrahydrofuran, heating to 50 ℃, stirring for 5min, adding modified asphalt, continuing to stir for 10min, adding 1, 6-hexamethylene diisocyanate and dibutyltin dilaurate, reacting for 24h in an argon atmosphere, continuing to add 4,4 '-dimethyl-2, 2' -bipyridine, heating to 60 ℃, reacting for 24h, adding 1, 4-butanediol, and continuing to react for 20h to obtain pretreated asphalt;
s5: dissolving the pretreated asphalt in tetrahydrofuran, adding zinc chloride, stirring at 50 ℃ for 5h, adding the heat-conducting material, the aggregate and the glass fiber, stirring at 100 ℃ for 1h, adding the admixture, and continuously stirring for 2min to obtain an asphalt mixture.
In this embodiment, the asphalt mixture comprises the following raw materials: by weight, 15 parts of pretreated asphalt, 35 parts of zinc chloride, 5 parts of heat conducting material, 8 parts of glass fiber, 5 parts of admixture and 90 parts of aggregate.
Wherein the pretreated asphalt comprises the following raw materials in parts by weight: by weight, 8 parts of modified asphalt, 6 parts of dihydroxy terminated polydimethylsiloxane, 14 parts of polycaprolactone diol, 2 parts of 1, 6-hexamethylene diisocyanate, 0.5 part of dibutyltin dilaurate, 4 parts of 4,4 '-dimethyl-2, 2' -bipyridine and 0.5 part of 1, 4-butanediol.
The modified asphalt comprises the following raw materials: 5 parts of epoxy resin, 6 parts of polyurethane, 8 parts of matrix asphalt, 5 parts of curing agent and 10 parts of porous additive by weight; the porous additive comprises the following raw materials in parts by weight: 8 parts of modified polystyrene, 8 parts of triethyl aluminum, 10 parts of toluene, 2 parts of levorotatory lactide and 10 parts of absolute ethyl alcohol.
The admixture comprises mineral powder, silica fume and fly ash, wherein the mass ratio of the mineral powder to the silica fume to the fly ash is 1: 2: 1; the curing agent is an amine curing agent; the catalyst is cuprous bromide.
Example 2:
s1: preparing materials;
s2: preparation of the porous additive:
dissolving 2-bromine isobutyryl bromide in diethyl ether, and stirring for 15min to obtain solution A; dissolving ethylene glycol and diethyl ether, stirring for 15min, placing in an ice water bath, slowly dropwise adding the solution A, and stirring at room temperature for 18h to obtain an initiator;
taking an initiator, a catalyst, 1,4,7,10, 10-hexamethyl triethylene tetramine and styrene, mixing and stirring for 15min, freezing, vacuumizing, heating in a nitrogen environment until the materials are dissolved, then placing in an oil bath at 112 ℃ for heating for 7.2h, adding toluene and alumina, continuing stirring for 18min, then adding ethanol, collecting precipitate, and drying in vacuum at 60 ℃ to obtain modified polystyrene;
dissolving modified polystyrene and toluene, adding a toluene solution of triethylaluminum, stirring for 13h, adding levorotatory lactide in a nitrogen environment, continuously freezing, vacuumizing for 6min, heating until the materials are dissolved, reacting for 6.5h at 92 ℃, adding absolute ethyl alcohol, collecting precipitates, and vacuum-drying for 24h at 50 ℃ to obtain a material B; dissolving the material B with dichloromethane, standing until the dichloromethane is completely volatilized, placing the material B into a mixed solution of sodium hydroxide and ethanol, and stirring for 7.5 days at 67 ℃ to obtain a porous additive;
s3: preparing a heat conducting material:
mixing and stirring aluminum nitrate, boric acid and melamine for 6min, adding the composite molten salt, and heating for 50min by microwave to obtain a heat conducting material;
s4: preparation of pretreated asphalt:
taking epoxy resin, adding polyurethane and matrix asphalt, carrying out ultrasonic treatment for 12min, mixing and shearing at the rotating speed of 200r/min for 4min, adding a curing agent, mixing and shearing at the rotating speed of 600r/min for 4min, adding a porous additive, standing for 7h, heating at 152 ℃ for 1.2h, adding tetrahydrofuran, and continuously stirring for 20min to obtain modified asphalt;
dissolving dihydroxy-terminated polydimethylsiloxane, polycaprolactone diol and tetrahydrofuran, heating to 50 ℃, stirring for 8min, adding modified asphalt, continuing to stir for 12min, adding 1, 6-hexamethylene diisocyanate and dibutyltin dilaurate, reacting for 24h in an argon atmosphere, continuing to add 4,4 '-dimethyl-2, 2' -bipyridine, heating to 61 ℃, reacting for 24h, adding 1, 4-butanediol, and continuing to react for 22h to obtain pretreated asphalt;
s5: dissolving the pretreated asphalt in tetrahydrofuran, adding zinc chloride, stirring at 52 ℃ for 5.5h, adding the heat-conducting material, the aggregate and the glass fiber, stirring at 105 ℃ for 1.2h, adding the admixture, and continuously stirring for 2.5min to obtain an asphalt mixture.
In this embodiment, the asphalt mixture comprises the following raw materials: 17 parts of pretreated asphalt, 32 parts of zinc chloride, 8 parts of heat conducting material, 10 parts of glass fiber, 8 parts of admixture and 95 parts of aggregate.
Wherein the pretreated asphalt comprises the following raw materials in parts by weight: by weight, 12 parts of modified asphalt, 7 parts of dihydroxy terminated polydimethylsiloxane, 15 parts of polycaprolactone diol, 3 parts of 1, 6-hexamethylene diisocyanate, 0.8 part of dibutyltin dilaurate, 5 parts of 4,4 '-dimethyl-2, 2' -bipyridine and 0.7 part of 1, 4-butanediol.
The modified asphalt comprises the following raw materials: 6 parts of epoxy resin, 7 parts of polyurethane, 9 parts of matrix asphalt, 6 parts of curing agent and 12 parts of porous additive by weight; the porous additive comprises the following raw materials in parts by weight: 9 parts of modified polystyrene, 9 parts of triethyl aluminum, 15 parts of toluene, 3 parts of levorotatory lactide and 21 parts of absolute ethyl alcohol.
The admixture comprises mineral powder, silica fume and fly ash, wherein the mass ratio of the mineral powder to the silica fume to the fly ash is 1: 2: 1.2; the curing agent is an amine curing agent; the catalyst is cuprous bromide.
Example 3:
s1: preparing materials;
s2: preparation of the porous additive:
dissolving 2-bromine isobutyryl bromide in diethyl ether, and stirring for 20min to obtain solution A; dissolving ethylene glycol and diethyl ether, stirring for 20min, placing in an ice water bath, slowly dropwise adding the solution A, and stirring for 20h at room temperature to obtain an initiator;
taking an initiator, a catalyst, 1,4,7,10, 10-hexamethyl triethylene tetramine and styrene, mixing and stirring for 20min, freezing, vacuumizing, heating in a nitrogen environment until the materials are dissolved, then placing in an oil bath at 115 ℃ for heating for 7.5h, adding toluene and alumina, continuing stirring for 20min, then adding ethanol, collecting precipitate, and drying in vacuum at 60 ℃ to obtain modified polystyrene;
dissolving modified polystyrene in toluene, adding a toluene solution of triethylaluminum, stirring for 14h, adding levorotatory lactide in a nitrogen environment, continuously freezing, vacuumizing for 7min, heating until the materials are dissolved, reacting for 7h at 95 ℃, adding absolute ethyl alcohol, collecting precipitates, and vacuum-drying for 24h at 50 ℃ to obtain a material B; dissolving the material B with dichloromethane, standing until the dichloromethane is completely volatilized, placing the material B into a mixed solution of sodium hydroxide and ethanol, and stirring for 8 days at 68 ℃ to obtain a porous additive;
s3: preparing a heat conducting material:
mixing and stirring aluminum nitrate, boric acid and melamine for 8min, adding the composite molten salt, and performing microwave heating for 60min to obtain a heat conducting material;
s4: preparation of pretreated asphalt:
taking epoxy resin, adding polyurethane and matrix asphalt, carrying out ultrasonic treatment for 15min, mixing and shearing at the rotating speed of 300r/min for 5min, adding a curing agent, mixing and shearing at the rotating speed of 800r/min for 5min, adding a porous additive, standing for 8h, heating at 155 ℃ for 1.5h, adding tetrahydrofuran, and continuously stirring for 20min to obtain modified asphalt;
dissolving dihydroxy-terminated polydimethylsiloxane, polycaprolactone diol and tetrahydrofuran, heating to 50 ℃, stirring for 10min, adding modified asphalt, continuing to stir for 15min, adding 1, 6-hexamethylene diisocyanate and dibutyltin dilaurate, reacting for 24h in an argon atmosphere, continuing to add 4,4 '-dimethyl-2, 2' -bipyridine, heating to 62 ℃, reacting for 24h, adding 1, 4-butanediol, and continuing to react for 24h to obtain pretreated asphalt;
s5: dissolving the pretreated asphalt in tetrahydrofuran, adding zinc chloride, stirring at 55 ℃ for 6h, adding the heat-conducting material, the aggregate and the glass fiber, stirring at 110 ℃ for 1.5h, adding the admixture, and continuously stirring for 3min to obtain an asphalt mixture.
In this embodiment, the asphalt mixture comprises the following raw materials: by weight, 18 parts of pretreated asphalt, 35 parts of zinc chloride, 10 parts of heat conducting material, 12 parts of glass fiber, 10 parts of admixture and 100 parts of aggregate.
Wherein the pretreated asphalt comprises the following raw materials in parts by weight: by weight, 14 parts of modified asphalt, 8 parts of dihydroxy terminated polydimethylsiloxane, 16 parts of polycaprolactone diol, 4 parts of 1, 6-hexamethylene diisocyanate, 1 part of dibutyltin dilaurate, 6 parts of 4,4 '-dimethyl-2, 2' -bipyridine and 0.8 part of 1, 4-butanediol.
The modified asphalt comprises the following raw materials: 7 parts of epoxy resin, 8 parts of polyurethane, 10 parts of matrix asphalt, 7 parts of curing agent and 14 parts of porous additive by weight; the porous additive comprises the following raw materials in parts by weight: 10 parts of modified polystyrene, 10 parts of triethyl aluminum, 20 parts of toluene, 4 parts of levorotatory lactide and 25 parts of absolute ethyl alcohol.
The admixture comprises mineral powder, silica fume and fly ash, wherein the mass ratio of the mineral powder to the silica fume to the fly ash is 1: 2: 1.5; the curing agent is an amine curing agent; the catalyst is cuprous bromide.
Experiment 1:
taking the asphalt mixtures prepared in the examples 1-3, respectively carrying out the water immersion marshall test on the asphalt mixture samples according to the specified method (T0790), respectively carrying out the freeze-thaw splitting test on the asphalt mixture samples according to the specified method (T0729), and detecting the water stability of each sample, wherein the detection results are shown in the following table:
| item | Example 1 | Example 2 | Example 3 |
| Immersion marshall test: residual stability (%) | 90.9 | 91.1 | 91.0 |
| Freeze-thaw splitting test: residual stability (%) | 89.7 | 89.9 | 89.8 |
Experiment 2: high-temperature stability:
the asphalt mixtures prepared in examples 1 to 3 were subjected to rutting tests on asphalt mixture samples according to the prescribed method (T0719), and the test data averaged over a number of tests are shown in the following table:
| item | Example 1 | Example 2 | Example 3 |
| Dynamic stability of rut (60 ℃, 0.7 MPa)/mm | 22793 | 22789 | 22794 |
| Dynamic stability of rut (70 ℃, 0.7 MPa)/mm | 19417 | 19414 | 19415 |
And (4) conclusion: the preparation method disclosed by the invention has the advantages that the process design is reasonable, the component proportion is proper, the prepared asphalt mixture has excellent anti-rutting capability, the high-temperature stability and the water stability of the asphalt mixture are improved, the asphalt mixture can be applied to roads with large traffic volume and more heavy-load and overloaded vehicles, and the practicability is higher.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (1)
1. The high-temperature-resistant and anti-rutting asphalt mixture is characterized in that: the asphalt mixture comprises the following raw materials: by weight, 17 parts of pretreated asphalt, 32 parts of zinc chloride, 8 parts of heat conducting material, 10 parts of glass fiber, 8 parts of admixture and 95 parts of aggregate;
wherein the pretreated asphalt comprises the following raw materials in parts by weight: by weight, 12 parts of modified asphalt, 7 parts of dihydroxy terminated polydimethylsiloxane, 15 parts of polycaprolactone diol, 3 parts of 1, 6-hexamethylene diisocyanate, 0.8 part of dibutyltin dilaurate, 5 parts of 4,4 '-dimethyl-2, 2' -bipyridine and 0.7 part of 1, 4-butanediol;
the modified asphalt comprises the following raw materials: 6 parts of epoxy resin, 7 parts of polyurethane, 9 parts of matrix asphalt, 6 parts of curing agent and 12 parts of porous additive by weight;
the porous additive comprises the following raw materials in parts by weight: 9 parts of modified polystyrene, 9 parts of triethyl aluminum, 15 parts of toluene, 3 parts of levorotatory lactide and 21 parts of absolute ethyl alcohol;
the admixture comprises mineral powder, silica fume and fly ash, wherein the mass ratio of the mineral powder to the silica fume to the fly ash is 1: 2: 1.2; the curing agent is an amine curing agent; the catalyst is cuprous bromide;
the preparation method of the high-temperature-resistant and anti-rutting asphalt mixture comprises the following steps:
s1: preparing materials;
s2: preparation of the porous additive:
dissolving 2-bromine isobutyryl bromide in diethyl ether, and stirring for 15min to obtain solution A; dissolving ethylene glycol and diethyl ether, stirring for 15min, placing in an ice water bath, slowly dropwise adding the solution A, and stirring at room temperature for 18h to obtain an initiator;
taking an initiator, a catalyst, 1,4,7,10, 10-hexamethyl triethylene tetramine and styrene, mixing and stirring for 15min, freezing, vacuumizing, heating in a nitrogen environment until the materials are dissolved, then placing in an oil bath at 112 ℃ for heating for 7.2h, adding toluene and alumina, continuing stirring for 18min, then adding ethanol, collecting precipitate, and drying in vacuum at 60 ℃ to obtain modified polystyrene;
dissolving modified polystyrene and toluene, adding a toluene solution of triethylaluminum, stirring for 13h, adding levorotatory lactide in a nitrogen environment, continuously freezing, vacuumizing for 6min, heating until the materials are dissolved, reacting for 6.5h at 92 ℃, adding absolute ethyl alcohol, collecting precipitates, and vacuum-drying for 24h at 50 ℃ to obtain a material B; dissolving the material B with dichloromethane, standing until the dichloromethane is completely volatilized, placing the material B into a mixed solution of sodium hydroxide and ethanol, and stirring for 7.5 days at 67 ℃ to obtain a porous additive;
s3: preparing a heat conducting material:
mixing and stirring aluminum nitrate, boric acid and melamine for 6min, adding the composite molten salt, and heating for 50min by microwave to obtain a heat conducting material;
s4: preparation of pretreated asphalt:
taking epoxy resin, adding polyurethane and matrix asphalt, carrying out ultrasonic treatment for 12min, mixing and shearing at the rotating speed of 200r/min for 4min, adding a curing agent, mixing and shearing at the rotating speed of 600r/min for 4min, adding a porous additive, standing for 7h, heating at 152 ℃ for 1.2h, adding tetrahydrofuran, and continuously stirring for 20min to obtain modified asphalt;
dissolving dihydroxy-terminated polydimethylsiloxane, polycaprolactone diol and tetrahydrofuran, heating to 50 ℃, stirring for 8min, adding modified asphalt, continuing to stir for 12min, adding 1, 6-hexamethylene diisocyanate and dibutyltin dilaurate, reacting for 24h in an argon atmosphere, continuing to add 4,4 '-dimethyl-2, 2' -bipyridine, heating to 61 ℃, reacting for 24h, adding 1, 4-butanediol, and continuing to react for 22h to obtain pretreated asphalt;
s5: dissolving the pretreated asphalt in tetrahydrofuran, adding zinc chloride, stirring at 52 ℃ for 5.5h, adding the heat-conducting material, the aggregate and the glass fiber, stirring at 105 ℃ for 1.2h, adding the admixture, and continuously stirring for 2.5min to obtain an asphalt mixture.
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| CN202110092526.7A CN112679146A (en) | 2020-05-26 | 2020-05-26 | High-temperature-resistant and anti-rutting asphalt mixture |
| CN202010452467.5A CN111574112B (en) | 2020-05-26 | 2020-05-26 | High-temperature-resistant and anti-rutting asphalt mixture and preparation method thereof |
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| CN202110092531.8A Active CN112679147B (en) | 2020-05-26 | 2020-05-26 | High-temperature-resistant rut-resistant asphalt mixture |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113603398A (en) * | 2021-08-18 | 2021-11-05 | 鄂尔多斯市路泰公路工程有限责任公司 | Anti-icing and noise-reducing asphalt mixture and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114855529A (en) * | 2022-05-25 | 2022-08-05 | 临湘市路桥工程有限公司 | Track-free asphalt pavement and construction method |
| CN115504709B (en) * | 2022-11-11 | 2023-04-11 | 北京建筑大学 | Bridge deck repairing polyurethane polymer concrete and preparation method thereof |
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| CN111574112A (en) | 2020-08-25 |
| CN112679147B (en) | 2023-05-30 |
| CN111574112B (en) | 2021-05-11 |
| CN112679147A (en) | 2021-04-20 |
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Application publication date: 20210420 |