CN116947347A - Porous aggregate for cooling pavement, modified asphalt mixture and preparation method - Google Patents
Porous aggregate for cooling pavement, modified asphalt mixture and preparation method Download PDFInfo
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- 238000001816 cooling Methods 0.000 title claims abstract description 113
- 239000010426 asphalt Substances 0.000 title claims abstract description 102
- 239000000203 mixture Substances 0.000 title claims abstract description 42
- 238000002360 preparation method Methods 0.000 title abstract description 16
- 239000000843 powder Substances 0.000 claims abstract description 58
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 45
- 229910052802 copper Inorganic materials 0.000 claims abstract description 40
- 239000010949 copper Substances 0.000 claims abstract description 40
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 33
- 239000011707 mineral Substances 0.000 claims abstract description 33
- 239000002994 raw material Substances 0.000 claims abstract description 24
- MTPVUVINMAGMJL-UHFFFAOYSA-N trimethyl(1,1,2,2,2-pentafluoroethyl)silane Chemical compound C[Si](C)(C)C(F)(F)C(F)(F)F MTPVUVINMAGMJL-UHFFFAOYSA-N 0.000 claims abstract description 21
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 17
- JHWGFJBTMHEZME-UHFFFAOYSA-N 4-prop-2-enoyloxybutyl prop-2-enoate Chemical compound C=CC(=O)OCCCCOC(=O)C=C JHWGFJBTMHEZME-UHFFFAOYSA-N 0.000 claims abstract description 10
- 229920002472 Starch Polymers 0.000 claims abstract description 10
- 239000001866 hydroxypropyl methyl cellulose Substances 0.000 claims abstract description 10
- 229920003088 hydroxypropyl methyl cellulose Polymers 0.000 claims abstract description 10
- 235000010979 hydroxypropyl methyl cellulose Nutrition 0.000 claims abstract description 10
- UFVKGYZPFZQRLF-UHFFFAOYSA-N hydroxypropyl methyl cellulose Chemical compound OC1C(O)C(OC)OC(CO)C1OC1C(O)C(O)C(OC2C(C(O)C(OC3C(C(O)C(O)C(CO)O3)O)C(CO)O2)O)C(CO)O1 UFVKGYZPFZQRLF-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000008107 starch Substances 0.000 claims abstract description 10
- 235000019698 starch Nutrition 0.000 claims abstract description 10
- 238000010438 heat treatment Methods 0.000 claims description 16
- 238000003756 stirring Methods 0.000 claims description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 12
- 239000002243 precursor Substances 0.000 claims description 12
- DVRDHUBQLOKMHZ-UHFFFAOYSA-N chalcopyrite Chemical compound [S-2].[S-2].[Fe+2].[Cu+2] DVRDHUBQLOKMHZ-UHFFFAOYSA-N 0.000 claims description 10
- 229910052951 chalcopyrite Inorganic materials 0.000 claims description 10
- 229910001779 copper mineral Inorganic materials 0.000 claims description 10
- 239000002245 particle Substances 0.000 claims description 9
- 239000012265 solid product Substances 0.000 claims description 9
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims description 8
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 8
- 239000004721 Polyphenylene oxide Substances 0.000 claims description 8
- 150000001412 amines Chemical class 0.000 claims description 8
- 239000008187 granular material Substances 0.000 claims description 8
- 229920000570 polyether Polymers 0.000 claims description 8
- UTTVXKGNTWZECK-UHFFFAOYSA-N n,n-dimethyloctadecan-1-amine oxide Chemical compound CCCCCCCCCCCCCCCCCC[N+](C)(C)[O-] UTTVXKGNTWZECK-UHFFFAOYSA-N 0.000 claims description 7
- 238000000498 ball milling Methods 0.000 claims description 6
- 239000008367 deionised water Substances 0.000 claims description 6
- 229910021641 deionized water Inorganic materials 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 6
- 238000007873 sieving Methods 0.000 claims description 6
- 238000001125 extrusion Methods 0.000 claims description 4
- 238000010000 carbonizing Methods 0.000 claims description 3
- GVGUFUZHNYFZLC-UHFFFAOYSA-N dodecyl benzenesulfonate;sodium Chemical compound [Na].CCCCCCCCCCCCOS(=O)(=O)C1=CC=CC=C1 GVGUFUZHNYFZLC-UHFFFAOYSA-N 0.000 claims description 3
- 238000001914 filtration Methods 0.000 claims description 3
- 238000000227 grinding Methods 0.000 claims description 3
- 238000003760 magnetic stirring Methods 0.000 claims description 3
- 229940080264 sodium dodecylbenzenesulfonate Drugs 0.000 claims description 3
- 239000000725 suspension Substances 0.000 claims description 3
- 238000001132 ultrasonic dispersion Methods 0.000 claims description 3
- ZJDCURJWFBQZMS-UHFFFAOYSA-L disodium;2-[carboxylatomethyl(dodecyl)amino]acetate Chemical compound [Na+].[Na+].CCCCCCCCCCCCN(CC([O-])=O)CC([O-])=O ZJDCURJWFBQZMS-UHFFFAOYSA-L 0.000 claims description 2
- 238000007781 pre-processing Methods 0.000 claims description 2
- 239000000243 solution Substances 0.000 claims 7
- 239000007864 aqueous solution Substances 0.000 claims 1
- 150000001879 copper Chemical class 0.000 claims 1
- 238000002791 soaking Methods 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 24
- 239000011384 asphalt concrete Substances 0.000 abstract description 20
- 230000005676 thermoelectric effect Effects 0.000 abstract description 8
- 238000005516 engineering process Methods 0.000 abstract description 7
- 238000009413 insulation Methods 0.000 abstract description 6
- 230000000052 comparative effect Effects 0.000 description 27
- 235000010755 mineral Nutrition 0.000 description 24
- 239000000463 material Substances 0.000 description 17
- 230000005855 radiation Effects 0.000 description 5
- 238000002156 mixing Methods 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 239000012756 surface treatment agent Substances 0.000 description 4
- 239000001996 bearing alloy Substances 0.000 description 3
- 201000010099 disease Diseases 0.000 description 3
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 3
- 239000011159 matrix material Substances 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000011056 performance test Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- QXNVGIXVLWOKEQ-UHFFFAOYSA-N Disodium Chemical compound [Na][Na] QXNVGIXVLWOKEQ-UHFFFAOYSA-N 0.000 description 2
- 230000032683 aging Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000007598 dipping method Methods 0.000 description 2
- 239000012774 insulation material Substances 0.000 description 2
- 125000000400 lauroyl group Chemical group O=C([*])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 230000001603 reducing effect Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 229910052613 tourmaline Inorganic materials 0.000 description 2
- 229940070527 tourmaline Drugs 0.000 description 2
- 239000011032 tourmaline Substances 0.000 description 2
- WCENBULLAYPQBU-UHFFFAOYSA-N 2-[carboxymethyl(dodecyl)amino]acetic acid;sodium Chemical compound [Na].CCCCCCCCCCCCN(CC(O)=O)CC(O)=O WCENBULLAYPQBU-UHFFFAOYSA-N 0.000 description 1
- 239000004113 Sepiolite Substances 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 239000003674 animal food additive Substances 0.000 description 1
- 229940105847 calamine Drugs 0.000 description 1
- 238000003776 cleavage reaction Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000005338 heat storage Methods 0.000 description 1
- 229910052864 hemimorphite Inorganic materials 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- -1 iron metals Chemical class 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000002086 nanomaterial Substances 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000002310 reflectometry Methods 0.000 description 1
- 230000007017 scission Effects 0.000 description 1
- 229910052624 sepiolite Inorganic materials 0.000 description 1
- 235000019355 sepiolite Nutrition 0.000 description 1
- 238000013112 stability test Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 238000010257 thawing Methods 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
- 235000014692 zinc oxide Nutrition 0.000 description 1
- CPYIZQLXMGRKSW-UHFFFAOYSA-N zinc;iron(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[O-2].[Fe+3].[Fe+3].[Zn+2] CPYIZQLXMGRKSW-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/02—Granular materials, e.g. microballoons
- C04B14/36—Inorganic materials not provided for in groups C04B14/022 and C04B14/04 - C04B14/34
-
- 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
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/02—Granular materials, e.g. microballoons
- C04B14/32—Carbides; Nitrides; Borides ; Silicides
- C04B14/322—Carbides
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/10—Coating or impregnating
- C04B20/1055—Coating or impregnating with inorganic materials
-
- 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
- C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
- C04B38/08—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by adding porous substances
-
- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/40—Porous or lightweight materials
-
- 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
- C04B2201/30—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values
- C04B2201/32—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values for the thermal conductivity, e.g. K-factors
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Civil Engineering (AREA)
- Road Paving Structures (AREA)
Abstract
The application provides a porous aggregate for pavement cooling, a modified asphalt mixture and a preparation method thereof, wherein the porous aggregate is prepared from the following raw materials: mineral aggregate, road asphalt, porous aggregate for road surface cooling, surface treating agent I and surface treating agent II. Wherein, the porous aggregate for cooling the pavement is prepared from the following raw materials: copper ore powder, nano titanium carbide, starch, 1, 4-butanediol diacrylate and hydroxypropyl methylcellulose. Compared with the single cooling of the prior asphalt pavement active cooling technology, the modified asphalt concrete with the cooling function has triple cooling effects, including thermoelectric effect, heat insulation function and sunlight reflection effect, so that the cooling effect of the asphalt pavement in the high temperature period in summer is obviously improved.
Description
Technical Field
The application belongs to the technical field of road materials, and relates to modified asphalt, in particular to porous aggregate for road surface cooling, a modified asphalt mixture and a preparation method thereof.
Background
Asphalt pavement is widely applied to road construction in China by virtue of the advantages of flat surface, comfort in driving and the like, however, the traditional asphalt pavement has strong heat absorption and heat storage capacity, so that the temperature of the pavement in the high-temperature period in summer reaches 63-68 ℃, and the development of rutting disease of the asphalt pavement and urban heat island effect is aggravated.
At present, students have developed related researches on an active cooling technology of asphalt pavement, and the existing achievements are divided into three types of reflection, radiation and heat insulation based on a cooling principle. The heat insulation technology realizes road surface layer heat insulation by adopting heat resistance materials to replace or partially replace coarse aggregates, but the problem of road performance attenuation caused by poor heat resistance aggregate performance is not solved yet; the reflective coating has the inherent defects of high cost, poor durability, low repeated utilization rate, complex construction process, environmental pollution, pavement usability influence and the like due to material and environment limitation; the radiation technology adopts infrared radiation powder and the like to radiate pavement heat energy to the outer space so as to realize cooling, but the cooling effect is poor, the radiation wavelength is difficult to regulate and control, and the heat radiation is reflected by an atmosphere layer and even can aggravate urban heat island effect. In summary, the existing research still does not realize the organic unification of the road surface cooling function, the road performance and the urban environment.
Disclosure of Invention
Aiming at the defects of the prior art, the application aims to provide the porous aggregate for cooling the pavement, which solves the technical problem that the cooling effect of the modified asphalt mixture in the prior art needs to be improved.
The application further aims to provide a modified asphalt mixture for road surface cooling and a preparation method thereof, which solve the technical problems that the road surface cooling function, the road performance and the urban environment of the modified asphalt in the prior art are difficult to be compatible.
In order to solve the technical problems, the application adopts the following technical scheme:
a porous aggregate for cooling pavement is prepared from the following raw materials: copper ore powder, nano titanium carbide, starch, 1, 4-butanediol diacrylate and hydroxypropyl methylcellulose.
Specifically, the mass ratio of the copper plaque mineral powder to the nano titanium carbide to the starch to the 1, 4-butanediol diacrylate to the hydroxypropyl methylcellulose is 2:0.2:5:2:0.1.
specifically, the porous aggregate for cooling the pavement is in a block shape, and the particle size is between 2 and 3 mm.
The application also provides a preparation method of the porous aggregate for cooling the pavement, which comprises the following steps:
step one, copper plaque powder pretreatment:
step 101, placing the bankrupt powder into a magnetic stirring water bath kettle filled with deionized water, adding N, N-dimethyl octadecyl amine oxide, and stirring for 2 hours at a temperature of 60 ℃ and a stirring speed of 1000rpm.
Step 102, putting nano titanium carbide into deionized water solution, adding polyether amine grafted acrylic acid, performing ultrasonic dispersion for 20min, taking out a lower suspension, and storing for later use.
And 103, placing the chalcopyrite powder solution and the nano titanium carbide solution into a planetary high-energy ball mill, wherein the ball milling speed is 200rpm, and the ball milling time is 2 hours, so as to obtain the chalcopyrite powder/nano titanium carbide solution.
And 104, taking out ball-milled copper powder/nano titanium carbide solution, placing in a 160 ℃ oven for drying to constant weight, taking out a dried solid product, grinding and sieving to obtain nano-modified copper powder.
Step two, preparing porous aggregate for cooling the pavement:
and 201, pouring the copper ore powder obtained in the first step into a starch solution, adding 1, 4-butanediol diacrylate, uniformly stirring, and obtaining the porous aggregate precursor coated with the copper ore powder by adopting a microwave heating method, wherein the microwave power is 800W, and the heating time is 20 min.
Step 202, dipping the porous aggregate precursor into hydroxypropyl methyl cellulose water solution, keeping the temperature at 90 ℃, filtering out the porous aggregate precursor, and pyrolyzing and carbonizing the porous aggregate precursor at a high temperature of 350 ℃ to obtain the porous aggregate coated with the plaque copper mineral powder.
And 203, crushing the porous aggregate coated with the plaque copper mineral powder, putting the crushed porous aggregate into an extrusion granulator, granulating by adopting a granule wet method, and setting the particle size of the granules to be 2-3 mm to obtain the porous aggregate with uniform size.
And 204, taking out the granulated porous aggregate, drying the porous aggregate in a 60 ℃ oven until the weight is constant, taking out the dried solid product, and sieving and dispersing the solid product to obtain the modified asphalt mixture for cooling the pavement.
The application also protects a modified asphalt mixture for road surface cooling, which is prepared from the following raw materials: mineral aggregate, road asphalt, porous aggregate for road surface cooling, surface treating agent I and surface treating agent II.
The porous aggregate for cooling the pavement adopts the porous aggregate for cooling the pavement.
Specifically, the material is prepared from the following raw materials in parts by weight: 86-94 parts of mineral aggregate, 6-12 parts of porous aggregate for road surface cooling, 3-7 parts of road asphalt, 1-2 parts of surface treating agent I and 0-0.5 part of surface treating agent II, wherein the sum of the mineral aggregate and the porous aggregate for road surface cooling is 100 parts by weight.
Preferably, the feed additive is prepared from the following raw materials in parts by weight: 88 parts of mineral aggregate, 12 parts of porous aggregate for road surface cooling, 4.4 parts of road asphalt, 1-2 parts of surface treating agent I and 0.4 part of surface treating agent II.
The surface treating agent I is N, N-dimethyl octadecyl amine oxide, N-dodecyl iminodiacetic acid sodium or lauroyl amphodiacetic acid disodium.
The surface treating agent II is polyether amine grafted acrylic acid or sodium dodecyl benzene sulfonate.
The application also provides a preparation method of the modified asphalt mixture for cooling the pavement, which comprises the following steps: firstly, replacing the porous aggregate for cooling the pavement with fine aggregate of 2.36mm grade in equal volume; then heating road asphalt to 150+/-5 ℃ and heating aggregate to 180+/-5 ℃, adding asphalt into the aggregate, stirring for 90s, and finally adding mineral powder, continuously stirring for 90-100 s to obtain the modified asphalt mixture for cooling the asphalt pavement.
Compared with the prior art, the application has the following technical effects:
compared with the single cooling of the prior asphalt pavement active cooling technology, the modified asphalt concrete with the cooling function has triple cooling effects, including thermoelectric effect, heat insulation function and sunlight reflection effect, so that the cooling effect of the asphalt pavement in the high temperature period in summer is obviously improved.
The thermoelectric effect of the banite powder is obvious, the Seebeck coefficient of the banite powder is far higher than that of traditional thermoelectric materials such as tourmaline and the like, the thermoelectric coefficient can be gradually improved along with the temperature increase, and finally the prepared modified asphalt concrete can convert the heat energy of the pavement in the high-temperature period in summer, so that the cooling effect of the pavement is improved.
The application combines the energy conversion and the porous attribute theory, adopts the basic materials such as the plaque copper mineral powder and the organic matters and the like to prepare the porous material which wraps the plaque copper mineral powder, namely the porous aggregate for cooling the pavement. Compared with the traditional mineral aggregate, the porous aggregate prepared by the application has obvious thermoelectric effect and heat insulation function.
According to the application, the nano titanium carbide is adopted to surface-modify the copper ore powder, so that the thermoelectric effect of the copper ore powder is improved, the stability of substances of the copper ore powder in a typical working condition environment is ensured, and charges generated by the thermoelectric effect are more conveniently dispersed in asphalt, thereby improving the service performance of asphalt pavement.
Aiming at the problem of road performance attenuation caused by the replacement of coarse aggregates by the traditional heat-insulating aggregates, the porous aggregate for cooling the road surface with the particle size of 2-3 mm is prepared, and the modified asphalt mixture for cooling the asphalt road surface is prepared by adopting the mode of replacing the fine aggregates with the same volume of 2.36mm, so that the long-term stability of the road performance of the asphalt road surface is ensured on the premise of realizing the technical aim of cooling the asphalt road surface.
(VI) the banite powder has certain reflectivity for light with various wavelengths, and the reflection effect can double-promote the asphalt pavement: (1) sunlight is reflected, so that the asphalt pavement can be cooled in summer; (2) reflecting ultraviolet rays and infrared rays, achieving the effects of resisting ultraviolet aging and thermal oxidation aging and prolonging the service life of the asphalt pavement.
The copper-bearing alloy (VII) has huge domestic reserves and lower cost, is generally used for smelting copper and iron metals, and develops new application of the copper-bearing alloy as a heat insulation material and a thermoelectric material based on excellent characteristics of the copper-bearing alloy powder such as thermoelectric effect, low heat conductivity coefficient and reflection effect.
Drawings
Fig. 1 is a graph of thermal conductivity of a conventional thermal resistive material.
Fig. 2 is a graph of seebeck coefficients of conventional thermoelectric materials.
Fig. 3 is a graph showing comparison of cooling performance of the modified asphalt concretes of examples 1 to 5 and comparative example 1.
Fig. 4 is a graph showing the cooling performance of the modified asphalt concretes of example 4 and comparative examples 1 to 4.
Fig. 5 (a) is the results of the high temperature rut resistance and low temperature crack resistance tests of examples 1 to 5.
Fig. 5 (b) is the water stability test results of examples 1 to 5.
The following examples illustrate the application in further detail.
Detailed Description
All the raw materials in the present application, unless otherwise specified, are known in the art.
In the application, the road asphalt can be selected from 70# matrix asphalt, 90# matrix asphalt, SBS modified asphalt or rubber powder modified asphalt. The surface treating agent I can be N, N-dimethyl octadecyl amine oxide, N-dodecyl iminodiacetic acid sodium salt or lauroyl amphoteric disodium salt. The surface treating agent II can be polyether amine grafted acrylic acid or sodium dodecyl benzene sulfonate. The number average molecular weight of the polyether amine grafted acrylic acid is 600-1200.
The following specific embodiments of the present application are provided, and it should be noted that the present application is not limited to the following specific embodiments, and all equivalent changes made on the basis of the technical scheme of the present application fall within the protection scope of the present application.
Example 1:
the embodiment provides a modified asphalt mixture for road surface cooling, which is prepared from the following raw materials in parts by weight: 94 parts of mineral aggregate, 6 parts of porous aggregate for road surface cooling, 4 parts of road asphalt, 1 part of surface treating agent I and 0.1 part of surface treating agent II.
The mineral aggregate is synthesized and graded into AC-13.
The porous aggregate for cooling the pavement is prepared from the following raw materials: copper ore powder, nano titanium carbide, starch, 1, 4-butanediol diacrylate and hydroxypropyl methylcellulose. The mass ratio of the copper plaque mineral powder to the nano titanium carbide to the starch to the 1, 4-butanediol diacrylate to the hydroxypropyl methylcellulose is 2:0.2:5:2:0.1. the particle size of the porous aggregate for cooling the pavement is 2-3 mm.
Road asphalt is 70# matrix asphalt.
The surface treating agent I is N, N-dimethyl octadecyl amine oxide.
The surface treating agent II is polyether amine grafted acrylic acid.
The preparation method of the modified asphalt mixture for cooling the pavement of the embodiment comprises the following steps:
firstly, preprocessing plaque copper mineral powder:
step 101, placing the bankrupt powder into a magnetic stirring water bath kettle filled with deionized water, adding N, N-dimethyl octadecyl amine oxide, and stirring for 2 hours at a temperature of 60 ℃ and a stirring speed of 1000rpm.
Step 102, putting nano titanium carbide into deionized water solution, adding polyether amine grafted acrylic acid, performing ultrasonic dispersion for 20min, taking out a lower suspension, and storing for later use.
And 103, placing the chalcopyrite powder solution and the nano titanium carbide solution into a planetary high-energy ball mill, wherein the ball milling speed is 200rpm, and the ball milling time is 2 hours, so as to obtain the chalcopyrite powder/nano titanium carbide solution.
And 104, taking out ball-milled copper powder/nano titanium carbide solution, placing in a 160 ℃ oven for drying to constant weight, taking out a dried solid product, grinding and sieving to obtain nano-modified copper powder.
Step two, preparing porous aggregate for cooling the pavement:
and 201, pouring the copper ore powder obtained in the first step into a starch solution, adding 1, 4-butanediol diacrylate, uniformly stirring, and obtaining the porous aggregate precursor coated with the copper ore powder by adopting a microwave heating method, wherein the microwave power is 800W, and the heating time is 20 min.
Step 202, dipping the porous aggregate precursor into hydroxypropyl methyl cellulose water solution, keeping the temperature at 90 ℃, filtering out the porous aggregate precursor, and pyrolyzing and carbonizing the porous aggregate precursor at a high temperature of 350 ℃ to obtain the porous aggregate coated with the plaque copper mineral powder.
And 203, crushing the porous aggregate coated with the plaque copper mineral powder, putting the crushed porous aggregate into an extrusion granulator, granulating by adopting a granule wet method, and setting the particle size of the granules to be 2-3 mm to obtain the porous aggregate with uniform size.
And 204, taking out the granulated porous aggregate, drying the porous aggregate in a 60 ℃ oven until the weight is constant, taking out the dried solid product, and sieving and dispersing the solid product to obtain the modified asphalt mixture for cooling the pavement.
Step three, preparing a modified asphalt mixture for road surface cooling:
firstly, replacing the porous aggregate for cooling the pavement with fine aggregate of 2.36mm grade in equal volume; then heating road asphalt to 150+/-5 ℃ and heating aggregate to 180+/-5 ℃, adding asphalt into the aggregate, stirring for 90s, and finally adding mineral powder, continuously stirring for 90-100 s to obtain the modified asphalt mixture for cooling the asphalt pavement.
Example 2:
the embodiment provides a modified asphalt mixture for road surface cooling, which is prepared from the following raw materials in parts by weight: 92 parts of mineral aggregate, 8 parts of porous aggregate for road surface cooling, 4.2 parts of road asphalt, 1 part of surface treating agent I and 0.2 part of surface treating agent II.
The selection and specification of the raw materials in this example were the same as in example 1.
The preparation method of the modified asphalt mixture for road surface cooling of this example is the same as that of example 1.
Example 3:
the embodiment provides a modified asphalt mixture for road surface cooling, which is prepared from the following raw materials in parts by weight: 90 parts of mineral aggregate, 10 parts of porous aggregate for road surface cooling, 4.4 parts of road asphalt, 1 part of surface treating agent I and 0.3 part of surface treating agent II.
The selection and specification of the raw materials in this example were the same as in example 1.
The preparation method of the modified asphalt mixture for road surface cooling of this example is the same as that of example 1.
Example 4:
the embodiment provides a modified asphalt mixture for road surface cooling, which is prepared from the following raw materials in parts by weight: 88 parts of mineral aggregate, 12 parts of porous aggregate for road surface cooling, 4.4 parts of road asphalt, 2 parts of surface treating agent I and 0.4 part of surface treating agent II.
The selection and specification of the raw materials in this example were the same as in example 1.
The preparation method of the modified asphalt mixture for road surface cooling of this example is the same as that of example 1.
Example 5:
the embodiment provides a modified asphalt mixture for road surface cooling, which is prepared from the following raw materials in parts by weight: 86 parts of mineral aggregate, 14 parts of porous aggregate for road surface cooling, 4.5 parts of road asphalt, 2 parts of surface treating agent I and 0.5 part of surface treating agent II.
The selection and specification of the raw materials in this example were the same as in example 1.
The preparation method of the modified asphalt mixture for road surface cooling of this example is the same as that of example 1.
Comparative example 1:
the comparative example shows a common asphalt concrete, the grading type of which is the same as that of example 1, and which is prepared from the following raw materials in parts by mass: 100 parts of mineral aggregate and 4.4 parts of road asphalt.
The preparation method of the asphalt concrete of the comparative example comprises the following steps: heating asphalt to 150 ℃, heating aggregate in mineral aggregate to 180 ℃, adding heated asphalt into the aggregate, mixing for 90s, finally adding mineral powder in the mineral aggregate, and continuously mixing for 90s to obtain asphalt concrete.
Comparative example 2:
the comparative example shows a modified asphalt mixture for road surface cooling, which is different from example 4 in that the plaque copper mineral powder is directly prepared into porous aggregate without nano modification.
Comparative example 3:
the comparative example provides a modified asphalt mixture for road surface cooling, which is prepared from the following raw materials in parts by mass: 88 parts of mineral aggregate, 12 parts of chalcopyrite, 4.4 parts of road asphalt, 2 parts of surface treating agent I and 0.4 part of surface treating agent II.
The preparation method of the modified asphalt mixture for road surface cooling in the comparative example comprises the following steps:
crushing the copper plaque, putting the crushed copper plaque into an extrusion granulator, granulating by adopting a granule wet method, and setting the particle size of granules to be 2-3 mm to obtain aggregate with uniform size; adopting the equivalent volume of the chalcopyrite aggregate to replace the fine aggregate of 2.36mm grade; heating road asphalt to 150 ℃ and heating aggregate to 180 ℃, adding asphalt into the aggregate, mixing for 90s, and finally adding mineral powder, and continuously mixing for 90s to obtain the modified asphalt mixture for cooling the pavement.
Comparative example 4:
the comparative example provides a modified asphalt mixture for road surface cooling, which is prepared from the following raw materials in parts by mass: 88 parts of mineral aggregate, 12 parts of porous aggregate for road surface cooling and 4.4 parts of road asphalt.
The preparation method of the modified asphalt mixture for road surface cooling of this comparative example is basically the same as that of example 4, except that the surface treatment agent I and the surface treatment agent II are not added in the preparation process of the porous aggregate for cooling.
Performance test:
the performance test of the modified asphalt mixture for cooling the pavement comprises 3 parts of aggregate basic performance, modified asphalt concrete cooling performance and modified asphalt concrete pavement performance test.
1. Basic aggregate performance:
(1) Thermal resistance characteristics:
as can be seen from FIG. 1, the thermal conductivity of conventional thermal resistance materials such as sepiolite and rectorite is 0.282-1.072W/(mK). Compared with the traditional thermal resistance material, the thermal conductivity coefficient of the copper ore powder is obviously reduced, and the reduction amplitude reaches 52.5-87.5%, which shows that the copper ore powder has great potential as the thermal resistance material. The porous aggregate for road surface cooling has the lowest heat conductivity coefficient in the heat resistance material, which shows that the effective combination of the porous property and the heat insulation material can further reduce the heat conductivity coefficient of the heat resistance aggregate.
As can be seen from FIG. 2, tourmaline, calamine, etc. are conventional thermoelectric materials with Seebeck coefficient of 147-172. Mu.V.K -1 . The copper maceraite A is natural copper maceraite, the Seebeck coefficient of which is obviously improved compared with the traditional thermoelectric material, and the copper maceraite A can reach 300 mu V.K at normal temperature -1 The amplification reaches 42.7% -48%, which shows that the thermoelectric property of the copper plaque is superior to that of the traditional thermoelectric material, and the copper plaque can be developed into a novel thermoelectric material. The copper plaque B is nano-modified copper plaque mineral powder, and the Seebeck coefficient of the copper plaque B is further improved compared with that of natural copper plaque, because the nano-modification technology enriches surface particles and nano structures of the copper plaque mineral powder, higher carrier mobility is generated, and thus the thermoelectric effect is improved. The Seebeck coefficient of the porous aggregate for cooling is between the copper maculates A and B, which shows that the composite of the copper maculates powder and the porous material still keeps stable thermoelectric efficiencyShould be.
2. Modified asphalt concrete cooling performance:
as can be seen from FIG. 3, when the atmospheric temperature is 36.7 ℃, the average temperature of the rut board prepared from the asphalt concrete for the common road in comparative example 6 is over 60 ℃, which is very liable to cause high temperature rut disease on the asphalt pavement in summer. In examples 1 to 5, the average temperature of the modified asphalt mixture rut board for cooling an asphalt pavement was 52.4 to 54.9 ℃, and the modified asphalt mixture rut board exhibited excellent cooling effect in summer. Compared with common road asphalt, the temperature reducing effect reaches 7.2-9.8 ℃. Comparative examples 1 to 5 the cooling efficacy of the modified asphalt mixture for cooling of asphalt pavement showed a tendency of increasing before attenuating with increasing the amount of porous aggregate for cooling. Wherein, when the porous aggregate dosage is 12 parts, namely example 4, the prepared modified asphalt concrete has the best cooling effect, and the cooling effect reaches 9.8 ℃. Therefore, the preferred embodiment 4 is the best embodiment of the cooling effect in summer.
Analysis of fig. 4 shows that comparative example 1 is a conventional AC-13 asphalt concrete rut board, comparative example 2 is a rut board finally prepared by non-nano modification of the chalcopyrite powder, comparative example 3 is a rut board prepared by directly replacing 2.36mm aggregate with chalcopyrite, and the only difference between comparative example 4 and example 4 is that no surface treatment agents i and ii are added. Compared with comparative example 1, the average temperature of the rutting plates of comparative examples 2-4 is reduced, and the order of the cooling effect is from the best to the inferior is from comparative example 4 to comparative example 2 to comparative example 3, which shows that the influence of the surface treatment agent on the cooling effect is greater than nano modification. In the rutting plate test in the high-temperature environment, the temperature reduction reaches 9.8 ℃, the temperature reduction effect is obviously better than that of each comparative example, and is improved by 26% -100% compared with that of comparative examples 2-4, so that the application develops the porous aggregate substrate for reducing the temperature by using the plaque copper mineral powder, and the application combines the energy conversion and porous attribute principles, so that the prepared modified asphalt concrete has remarkable temperature reduction effect, breaks through the bottleneck of the active temperature reduction technology of the existing asphalt pavement, and has important significance in preventing diseases such as high-temperature rutting on the pavement, relieving the urban heat island effect and prolonging the service life of the road.
3. Modified asphalt concrete road performance:
the high temperature rut resistance, low temperature crack resistance and water stability of the modified asphalt concretes of examples 1 to 5 of the present application were measured with reference to the relevant regulations of the test procedure for asphalt and asphalt concretes for highway engineering (JTG E20-2011), and the test results are shown in FIG. 5 (a) and FIG. 5 (b).
From fig. 5 (a) and fig. 5 (b), it can be seen that the dynamic stability, the damage strain, the residual stability and the freeze thawing cleavage residual strength ratio of the modified asphalt concrete of the present application all meet the related technical requirements of "test procedure for asphalt and asphalt concrete for highway engineering" (JTG E20-2011). Further, each of the properties of comparative examples 1 to 5, inventive example 4 was optimal.
Claims (10)
1. The porous aggregate for cooling the pavement is characterized by being prepared from the following raw materials: copper ore powder, nano titanium carbide, starch, 1, 4-butanediol diacrylate and hydroxypropyl methylcellulose.
2. The porous aggregate for cooling the pavement according to claim 1, wherein the mass ratio of the copper plaque powder, the nano titanium carbide, the starch, the 1, 4-butanediol diacrylate and the hydroxypropyl methylcellulose is 2:0.2:5:2:0.1.
3. the porous aggregate for cooling road surface according to claim 1, wherein the porous aggregate for cooling road surface is in the form of block with a particle size of 2-3 mm.
4. A method for preparing a porous aggregate for road surface cooling according to any one of claims 1 to 3, comprising the steps of:
firstly, preprocessing plaque copper mineral powder:
step 101, placing the bankrupt powder into a magnetic stirring water bath kettle filled with deionized water, adding N, N-dimethyl octadecylamine oxide, and stirring for 2 hours at a temperature of 60 ℃ and a stirring speed of 1000rpm;
102, putting nano titanium carbide into deionized water solution, adding polyether amine grafted acrylic acid, performing ultrasonic dispersion for 20min, taking out a lower suspension, and storing for later use;
step 103, placing the chalcopyrite powder solution and the nano titanium carbide solution into a planetary high-energy ball mill, wherein the ball milling speed is 200rpm, and the ball milling time is 2 hours, so as to obtain the chalcopyrite powder/nano titanium carbide solution;
104, taking out ball-milled copper plaque mineral powder/nano titanium carbide solution, placing the ball-milled copper plaque mineral powder/nano titanium carbide solution in a 160 ℃ oven for drying to constant weight, taking out a dried solid product, grinding and sieving to obtain nano-modified copper plaque mineral powder;
step two, preparing porous aggregate for cooling the pavement:
step 201, pouring the copper ore powder obtained in the step one into a starch solution, adding 1, 4-butanediol diacrylate, uniformly stirring, and adopting a microwave heating method, wherein the microwave power is 800W, and the heating time is 20min, so as to obtain a porous aggregate precursor coated with the copper ore powder;
step 202, soaking a porous aggregate precursor in a hydroxypropyl methyl cellulose aqueous solution, keeping the temperature at 90 ℃, filtering out the porous aggregate precursor, and pyrolyzing and carbonizing the porous aggregate precursor at a high temperature of 350 ℃ to obtain porous aggregate coated with copper ore powder;
step 203, crushing the porous aggregate coated with the copper ore powder, putting the crushed porous aggregate into an extrusion granulator, granulating by adopting a granule wet method, and setting the particle size of the granules to be 2-3 mm to obtain the porous aggregate with uniform size;
and 204, taking out the granulated porous aggregate, drying the porous aggregate in a 60 ℃ oven until the weight is constant, taking out the dried solid product, and sieving and dispersing the solid product to obtain the modified asphalt mixture for cooling the pavement.
5. The modified asphalt mixture for cooling the pavement is characterized by being prepared from the following raw materials: mineral aggregate, road asphalt, porous aggregate for road surface cooling, a surface treating agent I and a surface treating agent II;
the porous aggregate for cooling a road surface according to any one of claims 1 to 3.
6. The modified asphalt mixture for cooling a road surface according to claim 5, which is prepared from the following raw materials in parts by weight: 86-94 parts of mineral aggregate, 6-12 parts of porous aggregate for road surface cooling, 3-7 parts of road asphalt, 1-2 parts of surface treating agent I and 0-0.5 part of surface treating agent II, wherein the sum of the mineral aggregate and the porous aggregate for road surface cooling is 100 parts by weight.
7. The modified asphalt mixture for cooling a road surface according to claim 6, which is prepared from the following raw materials in parts by weight: 88 parts of mineral aggregate, 12 parts of porous aggregate for road surface cooling, 4.4 parts of road asphalt, 1-2 parts of surface treating agent I and 0.4 part of surface treating agent II.
8. The modified asphalt mixture for cooling a road surface according to claim 5, wherein the surface treating agent I is N, N-dimethyl octadecylamine oxide, sodium N-dodecyl iminodiacetate or disodium lauroyl amphodiacetate; the surface treating agent II is polyether amine grafted acrylic acid or sodium dodecyl benzene sulfonate.
9. A method for preparing the modified asphalt mixture for road surface cooling according to any one of claims 5 to 8, comprising the steps of: firstly, replacing the porous aggregate for cooling the pavement with fine aggregate of 2.36mm grade in equal volume; then heating road asphalt to 150+/-5 ℃ and heating aggregate to 180+/-5 ℃, adding asphalt into the aggregate, stirring for 90s, and finally adding mineral powder, continuously stirring for 90-100 s to obtain the modified asphalt mixture for cooling the asphalt pavement.
10. The method for preparing a modified asphalt mixture for road surface cooling according to claim 9, wherein the method for preparing a porous aggregate for road surface cooling according to claim 4 is adopted.
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| CN117585929B (en) * | 2024-01-19 | 2024-04-05 | 湖南大学 | Preparation method of aggregate with coating layer and cooling pavement material |
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