CN109626873B - High-thermal-conductivity asphalt mixture and pavement structure prepared from same - Google Patents
High-thermal-conductivity asphalt mixture and pavement structure prepared from same Download PDFInfo
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- CN109626873B CN109626873B CN201811642366.3A CN201811642366A CN109626873B CN 109626873 B CN109626873 B CN 109626873B CN 201811642366 A CN201811642366 A CN 201811642366A CN 109626873 B CN109626873 B CN 109626873B
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- 239000010426 asphalt Substances 0.000 title claims abstract description 45
- 239000000203 mixture Substances 0.000 title claims abstract description 37
- 239000011384 asphalt concrete Substances 0.000 claims abstract description 37
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 34
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims abstract description 26
- 239000003822 epoxy resin Substances 0.000 claims abstract description 20
- 229920000647 polyepoxide Polymers 0.000 claims abstract description 20
- 229910052582 BN Inorganic materials 0.000 claims abstract description 13
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 claims abstract description 13
- 229910000019 calcium carbonate Inorganic materials 0.000 claims abstract description 13
- 239000002557 mineral fiber Substances 0.000 claims abstract description 9
- 239000005543 nano-size silicon particle Substances 0.000 claims abstract description 9
- 235000012239 silicon dioxide Nutrition 0.000 claims abstract description 9
- 239000010410 layer Substances 0.000 claims description 85
- 239000002245 particle Substances 0.000 claims description 25
- 239000002344 surface layer Substances 0.000 claims description 25
- 239000006004 Quartz sand Substances 0.000 claims description 15
- 238000010438 heat treatment Methods 0.000 claims description 14
- 239000002994 raw material Substances 0.000 claims description 11
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 10
- 239000011701 zinc Substances 0.000 claims description 10
- 229910052725 zinc Inorganic materials 0.000 claims description 10
- 239000004925 Acrylic resin Substances 0.000 claims description 8
- 229920000178 Acrylic resin Polymers 0.000 claims description 8
- 239000002033 PVDF binder Substances 0.000 claims description 8
- KPUWHANPEXNPJT-UHFFFAOYSA-N disiloxane Chemical class [SiH3]O[SiH3] KPUWHANPEXNPJT-UHFFFAOYSA-N 0.000 claims description 8
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims description 8
- 239000002114 nanocomposite Substances 0.000 claims description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 2
- 239000003365 glass fiber Substances 0.000 claims description 2
- 229910021389 graphene Inorganic materials 0.000 claims description 2
- 229920006122 polyamide resin Polymers 0.000 claims description 2
- 239000011246 composite particle Substances 0.000 abstract description 7
- 238000009413 insulation Methods 0.000 abstract description 6
- 239000004593 Epoxy Substances 0.000 abstract description 5
- 238000012546 transfer Methods 0.000 abstract description 4
- 239000006087 Silane Coupling Agent Substances 0.000 abstract description 3
- XXBDWLFCJWSEKW-UHFFFAOYSA-N dimethylbenzylamine Chemical compound CN(C)CC1=CC=CC=C1 XXBDWLFCJWSEKW-UHFFFAOYSA-N 0.000 abstract description 3
- VYKXQOYUCMREIS-UHFFFAOYSA-N methylhexahydrophthalic anhydride Chemical compound C1CCCC2C(=O)OC(=O)C21C VYKXQOYUCMREIS-UHFFFAOYSA-N 0.000 abstract description 3
- -1 chlorine salt Chemical class 0.000 description 8
- 229910002804 graphite Inorganic materials 0.000 description 7
- 239000010439 graphite Substances 0.000 description 7
- 239000011398 Portland cement Substances 0.000 description 6
- 239000011159 matrix material Substances 0.000 description 6
- 238000003756 stirring Methods 0.000 description 6
- 150000001875 compounds Chemical class 0.000 description 5
- 238000002844 melting Methods 0.000 description 5
- 239000004568 cement Substances 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 4
- 238000010292 electrical insulation Methods 0.000 description 4
- 238000002360 preparation method Methods 0.000 description 4
- 239000012744 reinforcing agent Substances 0.000 description 4
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 3
- 235000011941 Tilia x europaea Nutrition 0.000 description 3
- 239000003054 catalyst Substances 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 230000005611 electricity Effects 0.000 description 3
- 239000010881 fly ash Substances 0.000 description 3
- 239000004571 lime Substances 0.000 description 3
- 206010039203 Road traffic accident Diseases 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 239000004567 concrete Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005485 electric heating Methods 0.000 description 2
- 230000003628 erosive effect Effects 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- SCVFZCLFOSHCOH-UHFFFAOYSA-M potassium acetate Chemical compound [K+].CC([O-])=O SCVFZCLFOSHCOH-UHFFFAOYSA-M 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- LNEPOXFFQSENCJ-UHFFFAOYSA-N haloperidol Chemical class C1CC(O)(C=2C=CC(Cl)=CC=2)CCN1CCCC(=O)C1=CC=C(F)C=C1 LNEPOXFFQSENCJ-UHFFFAOYSA-N 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 235000011056 potassium acetate Nutrition 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
- 230000007306 turnover Effects 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
- 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
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
-
- 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
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/10—Lime cements or magnesium oxide cements
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C11/00—Details of pavings
- E01C11/24—Methods or arrangements for preventing slipperiness or protecting against influences of the weather
- E01C11/26—Permanently installed heating or blowing devices ; Mounting thereof
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C7/00—Coherent pavings made in situ
- E01C7/08—Coherent pavings made in situ made of road-metal and binders
- E01C7/32—Coherent pavings made in situ made of road-metal and binders of courses of different kind made in situ
-
- 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
- C04B2111/00612—Uses not provided for elsewhere in C04B2111/00 as one or more layers of a layered structure
-
- 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
- C04B2111/90—Electrical properties
- C04B2111/92—Electrically insulating 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)
- Structural Engineering (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Road Paving Structures (AREA)
Abstract
The invention belongs to the technical field of road engineering, and particularly relates to a high-thermal-conductivity asphalt mixture and a pavement structure prepared from the same. The high-thermal-conductivity asphalt mixture provided by the invention comprises epoxy asphalt, modified epoxy resin, calcium carbonate-coated hexagonal boron nitride composite particles, nano silicon dioxide, mineral fibers, aggregate, methyl hexahydrophthalic anhydride, benzyl dimethylamine and a silane coupling agent. The calcium carbonate-coated hexagonal boron nitride composite particles, the nano silicon dioxide and the mineral fibers cooperatively construct a high-thermal-conductivity and high-insulation network chain structure, so that the thermal conductivity and the system resistivity of the structure prepared from the mixture are both large. The pavement can quickly transfer heat to the first asphalt concrete layer, melt snow on the pavement in time, prevent the pavement from being frozen and ensure normal passing of vehicles; meanwhile, the road surface does not have the electric leakage phenomenon, and the safety of pedestrians and vehicles is ensured.
Description
Technical Field
The invention belongs to the technical field of road engineering, and particularly relates to a high-thermal-conductivity asphalt mixture and a pavement structure prepared from the same.
Background
With the development of social economy, the footfall of urbanization construction is accelerated continuously, and criss-cross and densely-distributed line traffic networks are built between cities and inside the cities. The asphalt pavement has smooth surface, no joint, friction resistance and convenient maintenance, is comfortable to run and durable, and thus becomes the most common high-grade pavement in road construction.
In winter cold seasons, large areas of accumulated snow and ice often appear on the road surface, so that the normal running vehicles slip and are out of control, and then traffic accidents occur, therefore, the roads have to be closed to remove the ice and the snow, the smooth traffic is seriously affected, and great inconvenience is brought to the life of people.
At present, the snow melting and deicing measures for the road surfaces of expressways, airport runways, bridges, urban roads and the like mainly comprise mechanical snow removal, manual snow removal and snow removal by a snow melting agent. Wherein, the mechanical snow removal efficiency is low; the labor intensity of manual snow removal is high, and potential safety hazards exist; the snow removal by the snow-melting agent has the defects that the friction coefficient of a road surface covered by a coating is reduced, the braking distance is prolonged, traffic accidents such as vehicle sideslip, collision, vehicle turnover and the like are easy to happen, the traditional 'chlorine salt' snow-melting agent has serious corrosion to large-scale public infrastructure, and the potassium acetate organic snow-melting agent is too high in price and is not suitable for large-area use.
In order to solve the above problems, chinese patent document CN108442208A discloses a pavement structure with good thermal conductivity, which comprises a roadbed, a two-ash-soil base layer, an asphalt concrete lower surface layer, an asphalt concrete middle surface layer, a heating layer and an asphalt concrete upper surface layer, which are arranged in sequence from bottom to top; wherein, the layer that generates heat is including thermal-insulated tie coat, electrical heating rete and heat conduction tie coat, and the electrical heating rete is located between thermal-insulated tie coat and the heat conduction tie coat, and the electrical heating rete is conducted electricity through graphite alkene strip and is heated, with heat transfer to asphalt concrete upper surface layer, can in time melt snow and the frozen ice on the asphalt concrete upper surface layer, guarantees that the vehicle is normally current.
However, this road surface structure has the following problems: when the electric heating film layer is electrified, the heat conduction bonding layer and the asphalt concrete upper surface layer cannot be ensured not to leak electricity, and serious consequences can be caused to pedestrians and vehicles once electricity is leaked; even if the defect of electric leakage can be overcome, the electric heating film layer in the pavement structure is adopted to melt accumulated snow due to poor heat conductivity of the common asphalt concrete layer, so that the working efficiency is low; the thickness of bituminous concrete upper surface layer is more than 4cm among the above-mentioned road surface structure, and along with the increase of motor vehicle quantity, bituminous concrete upper surface layer has the trend of thickening in addition, and its heat conduction effect will be worse in the time of.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to overcome the defects of poor electrical insulation and low heat conduction efficiency of the existing pavement structure, so that the high-thermal-conductivity asphalt mixture with good insulation performance, high heat conduction speed and material saving and the pavement structure prepared from the asphalt mixture are provided.
In order to solve the technical problems, the invention adopts the technical scheme that:
the invention provides a high-thermal-conductivity asphalt mixture which comprises the following raw materials in parts by weight:
preferably, in the high-thermal-conductivity asphalt mixture, the modified epoxy resin is prepared by reacting siloxane, acrylic resin, polyvinylidene fluoride and epoxy resin.
Preferably, the particle size of the calcium carbonate coated hexagonal boron nitride nano composite particles in the high-thermal-conductivity asphalt mixture is 60-80 nm; the particle size of the nano silicon dioxide is 10-20 nm.
Further preferably, the high thermal conductivity asphalt mixture comprises the following components in percentage by mass:
further preferably, the high thermal conductivity asphalt mixture, the aggregate comprises diabase and quartz sand;
wherein the mass ratio of the diabase to the quartz sand is (1-1.5): 1, the particle size of the diabase is 2-4 mm, and the particle size of the quartz sand is 0.15-0.3 mm.
Further preferably, the high thermal conductivity asphalt mixture further comprises mineral fibers and glass fibers.
The invention also provides a pavement structure prepared from the high-thermal-conductivity asphalt mixture.
Preferably, the pavement structure comprises a surface layer, a base layer and a subbase layer which are sequentially arranged from top to bottom, wherein the surface layer is used for directly bearing the load of a travelling crane, and the base layer is used for diffusing the load transferred by the surface layer to the subbase layer;
the surface layer comprises a first asphalt concrete layer, a heating layer and a second asphalt concrete layer which are sequentially arranged from top to bottom;
the first asphalt concrete layer is prepared from the high-thermal-conductivity asphalt mixture.
Further preferably, in the pavement structure, the heating layer includes a zinc plate and graphene strips fixed on the zinc plate.
Preferably, in the pavement structure, the second asphalt concrete layer comprises the following raw materials in parts by weight:
further preferably, the basalt comprises, in mass percent: 57% of 9.5-16 mm basalt, 39% of 4.75-9.5 mm basalt and 4% of 2.36-4.75 mm basalt.
The technical scheme of the invention has the following advantages:
1. the high-thermal-conductivity asphalt mixture provided by the invention comprises epoxy asphalt, modified epoxy resin, calcium carbonate-coated hexagonal boron nitride composite particles, nano silicon dioxide, mineral fibers, aggregate, methyl hexahydrophthalic anhydride, benzyl dimethylamine and a silane coupling agent.
The calcium carbonate coated hexagonal boron nitride composite particles adopted by the invention are formed by coating spherical calcium carbonate on hexagonal boron nitride through chemical covalent bonds, so that the interface thermal resistance can be reduced, and the calcium carbonate coated hexagonal boron nitride composite particles have higher electrical insulation; the calcium carbonate-coated hexagonal boron nitride composite particles, the nano silicon dioxide and the mineral fibers are cooperated to construct a high-thermal-conductivity high-insulation network chain structure, and then the high-thermal-conductivity high-insulation network chain structure is expanded in the three-dimensional direction after the epoxy asphalt is adsorbed, so that the high planar thermal conductivity is ensured, and simultaneously, the high normal phase thermal conductivity is also ensured, and the thermal conductivity coefficient of a system prepared from the mixture is more than 3.25W/(m.K)The system resistivity is 9.3 multiplied by 1013Omega or more. Meanwhile, the epoxy asphalt has stronger compression resistance, deformation resistance, fatigue resistance and erosion resistance, and a hyperbranched net structure is formed under the action of methyl hexahydrophthalic anhydride, benzyl dimethylamine and a silane coupling agent, so that a pavement prepared from the mixture has more excellent strength, thermal conductivity and electrical insulation.
2. The high-thermal-conductivity asphalt mixture provided by the invention is added with the polyamide resin to further increase the electrical insulation performance.
3. The pavement structure prepared from the high-thermal-conductivity asphalt mixture can quickly transfer heat to the first asphalt concrete layer, melt snow on the pavement in time, prevent the pavement from being frozen and ensure normal traffic of vehicles; meanwhile, the road surface does not generate electric leakage phenomenon, and the safety of pedestrians and vehicles can be ensured.
4. The invention provides a pavement structure prepared from a high-thermal-conductivity asphalt mixture, wherein a second asphalt concrete layer comprises the following raw materials in parts by weight: the layer has good heat insulation effect and prevents heat generated by the heating layer from being transferred to the base layer and the subbase layer.
Detailed Description
In order to facilitate understanding of the objects, technical solutions and gist of the present invention, embodiments of the present invention will be described in further detail below. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, this embodiment is provided so that this disclosure will be thorough and complete and will fully convey the concept of the invention to those skilled in the art, and the present invention will only be defined by the appended claims.
Example 1
The embodiment provides a pavement structure, which comprises a surface layer, a base layer and a bottom base layer, wherein the surface layer, the base layer and the bottom base layer are sequentially arranged from top to bottom; the surface layer is composed of a first asphalt concrete layer, a heating layer and a second asphalt concrete layer which are sequentially arranged from top to bottom.
The first asphalt concrete layer is prepared from a high-thermal-conductivity asphalt mixture, and the high-thermal-conductivity asphalt mixture comprises the following raw materials in parts by weight:
the modified epoxy resin is prepared by the reaction of siloxane, acrylic resin, polyvinylidene fluoride and epoxy resin, and the preparation method comprises the following steps:
(1) adding siloxane, acrylic resin, polyvinylidene fluoride and epoxy resin (the molar ratio is 1:2.5:1:1.5) into an open mill, and stirring for 3 hours at 150 ℃;
(2) after the temperature of the open mill is cooled to 40-50 ℃, adding a catalyst, and uniformly stirring to obtain a rubber compound;
(3) and (3) thermally curing the rubber compound prepared in the step (2) at 150 ℃ for 30min under the pressure of 5MPa to prepare the modified epoxy resin.
The modified epoxy resin prepared by the preparation method has better compression resistance, deformation resistance, fatigue resistance and erosion resistance than other conventional modified epoxy resins.
The particle size of the calcium carbonate coated hexagonal boron nitride nano composite particles is 70 nm;
the particle size of the nano silicon dioxide is 15 nm;
the mineral fiber comprises the following components (by mass):
the aggregate comprises diabase and quartz sand, wherein the mass ratio of the diabase to the quartz sand is 1.25: 1, the particle size of diabase is 3mm, and the particle size of quartz sand is 0.225 mm.
The thickness of the first asphalt concrete layer was 2 cm.
The layer that generates heat includes the zinc sheet and fixes the graphite alkene strip at the zinc sheet, and graphite alkene strip is connected with the electrode wire.
The thickness of the heating layer is 2 cm.
The second asphalt concrete layer comprises the following raw materials in parts by weight:
wherein the matrix asphalt is No. 70 matrix asphalt; the basalt comprises the following components in percentage by mass: 57% of 9.5-16 mm basalt, 39% of 4.75-9.5 mm basalt and 4% of 2.36-4.75 mm basalt.
The thickness of the second asphalt concrete layer was 8 cm.
The base layer comprises cement stabilized macadam, reinforcing agent and portland cement in a mass ratio of 47% to 1% to 52%; the thickness of the base layer was 15 cm.
The subbase layer comprises 40 mass percent of lime, 39 mass percent of fly ash and 21 mass percent of portland cement; the thickness of the sub-base layer was 6 cm.
Example 2
The embodiment provides a pavement structure, which comprises a surface layer, a base layer and a bottom base layer, wherein the surface layer, the base layer and the bottom base layer are sequentially arranged from top to bottom; the surface layer is composed of a first asphalt concrete layer, a heating layer and a second asphalt concrete layer which are sequentially arranged from top to bottom.
The first asphalt concrete layer is prepared from a high-thermal-conductivity asphalt mixture, and the high-thermal-conductivity asphalt mixture comprises the following raw materials in parts by weight:
the modified epoxy resin is prepared by the reaction of siloxane, acrylic resin, polyvinylidene fluoride and epoxy resin, and the preparation method comprises the following steps:
(1) adding siloxane, acrylic resin, polyvinylidene fluoride and epoxy resin (the molar ratio is 1:1.5:1.5:1.0) into an open mill, and stirring for 2 hours at 160 ℃;
(2) after the temperature of the open mill is cooled to 50 ℃, adding a catalyst, and uniformly stirring to obtain a rubber compound;
(3) and (3) thermally curing the rubber compound prepared in the step (2) for 20min at the temperature of 130 ℃ under the pressure of 15MPa to prepare the modified epoxy resin.
The particle size of the calcium carbonate coated hexagonal boron nitride nano composite particles is 80 nm;
the particle size of the nano silicon dioxide is 10 nm;
the mineral fiber comprises the following components (by mass):
the aggregate comprises diabase and quartz sand, wherein the mass ratio of the diabase to the quartz sand is 1:1, the particle size of diabase is 4mm, and the particle size of quartz sand is 0.15 mm.
The thickness of the first asphalt concrete layer was 1.5 cm.
The layer that generates heat includes the zinc sheet and fixes the graphite alkene strip at the zinc sheet, and graphite alkene strip is connected with the electrode wire.
The thickness of the heating layer is 2 cm.
The second asphalt concrete layer comprises the following raw materials in parts by weight:
wherein the matrix asphalt is No. 90 matrix asphalt; the basalt comprises the following components in percentage by mass: 57% of 9.5-16 mm basalt, 39% of 4.75-9.5 mm basalt and 4% of 2.36-4.75 mm basalt.
The thickness of the second asphalt concrete layer was 8 cm.
The base layer comprises 55% by mass of cement stabilized macadam, 3% by mass of reinforcing agent and 42% by mass of portland cement; the thickness of the base layer was 15 cm.
The subbase layer comprises 35% by mass of lime, 50% by mass of fly ash and 15% by mass of portland cement; the thickness of the sub-base layer was 6 cm.
Example 3
The embodiment provides a pavement structure, which comprises a surface layer, a base layer and a bottom base layer, wherein the surface layer, the base layer and the bottom base layer are sequentially arranged from top to bottom; the surface layer is composed of a first asphalt concrete layer, a heating layer and a second asphalt concrete layer which are sequentially arranged from top to bottom.
The first asphalt concrete layer is prepared from a high-thermal-conductivity asphalt mixture, and the high-thermal-conductivity asphalt mixture comprises the following raw materials in parts by weight:
the modified epoxy resin is prepared by the reaction of siloxane, acrylic resin, polyvinylidene fluoride and epoxy resin, and the preparation method comprises the following steps:
(1) adding siloxane, acrylic resin, polyvinylidene fluoride and epoxy resin (the molar ratio is 1:2.0:1.5:1.0) into an open mill, and stirring for 4 hours at 140 ℃;
(2) after the temperature of the open mill is cooled to 45 ℃, adding a catalyst, and uniformly stirring to obtain a rubber compound;
(3) and (3) thermally curing the mixed rubber prepared in the step (2) at the temperature of 140 ℃ for 40min under the pressure of 10MPa to prepare the modified epoxy resin.
The particle size of the calcium carbonate coated hexagonal boron nitride nano composite particles is 60 nm;
the particle size of the nano silicon dioxide is 20 nm;
the mineral fiber comprises the following components (by mass):
the aggregate comprises diabase and quartz sand, wherein the mass ratio of the diabase to the quartz sand is 1.5:1, the particle size of diabase is 2mm, and the particle size of quartz sand is 0.3 mm.
The thickness of the first asphalt concrete layer was 2.5 cm.
The layer that generates heat includes the zinc sheet and fixes the graphite alkene strip at the zinc sheet, and graphite alkene strip is connected with the electrode wire.
The thickness of the heating layer is 2 cm.
The second asphalt concrete layer comprises the following raw materials in parts by weight:
wherein the matrix asphalt is No. 70 matrix asphalt; the basalt comprises the following components in percentage by mass: 57% of 9.5-16 mm basalt, 39% of 4.75-9.5 mm basalt and 4% of 2.36-4.75 mm basalt.
The thickness of the second asphalt concrete layer was 8 cm.
The base layer comprises cement stabilized macadam, reinforcing agent and portland cement, and the mass ratio of the cement stabilized macadam to the reinforcing agent is 40% to 2% to 58%; the thickness of the base layer was 15 cm.
The subbase layer comprises 45 mass percent of lime, 35 mass percent of fly ash and 20 mass percent of portland cement; the thickness of the sub-base layer was 6 cm.
Test example 1
The high thermal conductivity asphalt mixtures prepared in examples 1 to 3 were subjected to thermal conductivity and system resistivity tests, and the results are shown in table 1:
TABLE 1 thermal conductivity and System resistivity of high thermal conductivity asphalt mixtures
| Thermal conductivity (W/(m.K)) | System resistivity (10)13Ω) | |
| Example 1 | 3.38 | 9.5 |
| Example 2 | 3.40 | 9.8 |
| Example 3 | 3.25 | 9.3 |
As can be seen from table 1, the modified epoxy resin, the calcium carbonate-coated hexagonal boron nitride composite particles, and the nano-silica are added to the modified epoxy asphalt to impart excellent heat conductivity and insulation properties to the mixture; the pavement structure prepared from the high-thermal-conductivity asphalt mixture can quickly transfer heat to the first asphalt concrete layer, melt snow on the pavement in time, prevent the pavement from being frozen and ensure normal traffic of vehicles; meanwhile, the road surface does not generate electric leakage phenomenon, and the safety of pedestrians and vehicles can be ensured.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (8)
1. The high-thermal-conductivity asphalt mixture is characterized by comprising the following raw materials in parts by weight:
the mineral fiber comprises the following components:
the particle size of the calcium carbonate coated hexagonal boron nitride nano composite particles is 60-80 nm; the particle size of the nano silicon dioxide is 10-20 nm.
2. The high thermal conductivity asphalt mixture according to claim 1, wherein the modified epoxy resin is prepared by reacting siloxane, acrylic resin, polyvinylidene fluoride and epoxy resin.
3. The high thermal conductivity asphalt mixture according to claim 1, wherein said aggregate comprises diabase and quartz sand;
wherein the mass ratio of the diabase to the quartz sand is (1-1.5): 1, the particle size of the diabase is 2-4 mm, and the particle size of the quartz sand is 0.15-0.3 mm.
4. The high thermal conductivity asphalt mixture according to claim 3, further comprising polyamide resin and glass fiber.
5. The pavement structure is characterized by comprising a surface layer, a base layer and a subbase layer which are sequentially arranged from top to bottom, wherein the surface layer is used for directly bearing the load of a travelling crane, and the base layer is used for diffusing the load transferred by the surface layer to the subbase layer;
the surface layer comprises a first asphalt concrete layer, a heating layer and a second asphalt concrete layer which are sequentially arranged from top to bottom;
the first asphalt concrete layer is prepared from the high thermal conductivity asphalt mixture according to any one of claims 1 to 4.
6. A pavement structure as set forth in claim 5, wherein said heat-generating layer includes a zinc sheet and graphene strips fixed on said zinc sheet.
7. A pavement structure according to claim 5 or 6, characterized in that said second asphalt concrete layer comprises the following raw materials in parts by weight:
8. a pavement structure according to claim 7, characterized in that said basalt comprises, in mass percentages: 57% of 9.5-16 mm basalt, 39% of 4.75-9.5 mm basalt and 4% of 2.36-4.75 mm basalt.
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