CN112110681A - Conductive concrete casting material and preparation method thereof - Google Patents
Conductive concrete casting material and preparation method thereof Download PDFInfo
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- CN112110681A CN112110681A CN202011017831.1A CN202011017831A CN112110681A CN 112110681 A CN112110681 A CN 112110681A CN 202011017831 A CN202011017831 A CN 202011017831A CN 112110681 A CN112110681 A CN 112110681A
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- asphalt
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- asphalt concrete
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- stainless steel
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B26/00—Compositions of mortars, concrete or artificial stone, containing only organic binders, e.g. polymer or resin concrete
- C04B26/02—Macromolecular compounds
- C04B26/26—Bituminous materials, e.g. tar, pitch
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/0075—Uses not provided for elsewhere in C04B2111/00 for road construction
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/90—Electrical properties
- C04B2111/94—Electrically conducting materials
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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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
Abstract
The invention discloses a conductive asphalt concrete casting material and a preparation method thereof, wherein the modified casting material is mainly prepared from composite modified asphalt, mineral aggregate, graphene micro-sheets, high-purity copper powder and superfine stainless steel fibers; the preparation method comprises the steps of heating the mineral aggregate to 240-260 ℃, uniformly mixing the mineral aggregate with the composite modified asphalt, adding high-purity copper powder and superfine stainless steel fibers, and finally adding graphene nanoplatelets and uniformly mixing. Graphene micro-sheets, high-purity copper powder and superfine stainless steel fibers in the conductive asphalt concrete prepared by the method are uniformly filled in gaps of the asphalt concrete and are tightly wrapped with asphalt cement, so that the porosity of an asphalt mixture is reduced, and the conductive asphalt concrete has excellent water permeability resistance, low-temperature crack resistance and good following performance with a steel bridge surface; the invention has the advantages of both the cast asphalt concrete and the conductive asphalt concrete, and can be electrified and heated in the low-temperature environment in winter to melt ice and snow.
Description
Technical Field
The invention relates to the technical field of road engineering materials, in particular to a conductive concrete asphalt concrete casting material and a preparation method thereof.
Background
In winter ice and snow weather, the ice and snow phenomenon of the steel bridge area is serious, and traffic accidents are often caused. For this reason, people lay cast asphalt concrete on the steel bridge deck. However, the existing cast asphalt concrete steel bridge deck pavement is prone to cause the phenomenon that the upper structure of a bridge is greatly influenced by the external environment temperature in winter, the phenomenon that ice and snow are accumulated on the bridge deck is still serious, traffic accidents are easy to occur, and serious inconvenience is brought to people's trips.
Workers in this field come to expect many ways to remove ice and snow, such as spreading chlorine salt, manually removing ice and snow, spreading chemical agents to melt ice and snow, and mechanically removing ice and snow. However, the modes either pollute the environment to a certain extent or have low ice and snow removing efficiency; for example, although the spread chloride salt can melt ice and snow quickly, chloride ions can permeate into the ground along with the solution, so that the growth of green plants is damaged, and the chloride ions can corrode reinforcing steel bars; the efficiency of manual ice and snow removal is low, chemical agents and chloride ions can pollute the environment, the cost of mechanical ice and snow removal is high, the service time is too short after the ice and snow are purchased, and resources are left unused.
Disclosure of Invention
The invention provides a conductive concrete asphalt concrete casting material and a preparation method thereof, and aims to solve the problems that the existing asphalt concrete paved on a steel bridge floor has poor low-temperature resistance and can not melt ice and snow quickly.
In order to solve the technical problems, the invention adopts the following technical scheme:
designing a conductive asphalt concrete casting material, which is prepared from the following raw materials in parts by weight: 8-15 parts of composite modified asphalt, 80-120 parts of mineral aggregate (including coarse aggregate, fine aggregate and mineral powder), 4-8 parts of graphene micro-sheets, 2-4 parts of high-purity copper powder and 1.5-2.5 parts of superfine stainless steel fibers.
In the research process of the invention, the graphene micro-sheets in the conductive asphalt concrete formed by the castable form alternate multi-layer filling, when the doping amount is small, the layered graphene micro-sheet particles are blocked by aggregates, the conductive particles cannot jump in the mixture, the resistivity of the mixture is very high, when the doping amount reaches a percolation threshold value, although no direct contact exists among the particles, a tunnel effect is generated, the obvious characteristic of the mixture is that the resistivity suddenly drops, when the doping amount is higher than the percolation threshold value, the conductive molecular distance is smaller, even the conductive molecular distance can be in direct contact, and the graphene micro-sheet particles can form a good conductive chain in the mixture; therefore, although the graphene microchip particles are easy to disperse uniformly and have good conductivity, the doping amount of the graphene microchip in the casting material needs to be controlled so as to balance the relationship between good resistivity and good mechanical property.
The superfine stainless steel fiber has the same conductive condition of the graphene microchip, and the size of the superfine stainless steel fiber is far larger than that of the graphene microchip, so that the blocking effect of aggregate on the fiber is small, the fiber compensates for the interruption of a conductive chain of graphene microchip particles on one hand, and the superfine stainless steel fiber is connected with the blocked conductive particles in the asphalt mixture and is connected with a bundle of stainless steel filaments; on the other hand, the high-strength chopped fiber material can play a role in reinforcing the asphalt mixture, can inhibit the development of cracks in the asphalt concrete, can reduce the resistivity of the conductive asphalt concrete, and also improves the strength of the conductive asphalt concrete.
The composite modified asphalt is prepared from SBS modified asphalt, natural lake asphalt and Sasobit modifier according to the following steps: natural lake asphalt: sasobit modifier = 70-80: 20-30: 2-4 by mass ratio.
The superfine stainless steel fiber is a pure metal soft fiber which is prepared by using 304, 304L, 316 and 316L stainless steel as base materials through a bundling drawing method.
The mineral aggregate is a continuous graded mixture based on the following size fractions: 0-0.075 mm, 0.075 mm-0.15 mm, 0.15 mm-0.30 mm, 0.30 mm-0.60 mm, 0.60 mm-1.18 mm, 1.18 mm-2.36 mm, 2.36 mm-4.75 mm, 4.75 mm-9.5 mm and 9.5 mm-13.2 mm; the mixing ratio of the coarse aggregate, the fine aggregate and the mineral powder in the mixture is determined by the oversize passing rate of each particle size.
The preparation method of the conductive asphalt concrete casting material comprises the following steps:
(1) firstly, heating aggregate to 240-260 ℃, and then uniformly mixing the aggregate with the composite modified asphalt;
(2) then adding superfine stainless steel fibers and uniformly mixing;
(3) and finally, adding the graphene nanoplatelets, the high-purity copper powder and the mineral powder filler, and uniformly mixing to obtain the conductive asphalt concrete casting material.
Mixing for 1-3 min in the step (1); mixing for 2-4 min in the step (2); blending for 35-45 min in the step (3).
Compared with the prior art, the invention has the main beneficial technical effects that:
1. the conductive asphalt concrete prepared by pouring and paving the invention has excellent water permeability resistance, low-temperature crack resistance and good following performance with a steel bridge deck.
2. Scanning electron microscopy shows that the conductive material in the conductive asphalt concrete paved by the castable is uniformly dispersed, for example, graphene microchip particles can form a good conductive chain in the asphalt concrete, and high-purity copper powder and superfine stainless steel fibers can reduce the resistivity of the concrete (the conductive process is based on the contact of electrons and the tunnel effect generated when the electron distance is small) in the asphalt concrete, also play a role in reinforcing ribs and effectively inhibit the development of cracks in the asphalt concrete.
3. According to the invention, after a proper amount of graphene micro-sheets, high-purity copper powder and superfine stainless steel fibers are added into asphalt concrete, the asphalt concrete (lower than 15.0 omega. m) which is prepared according to the pouring type asphalt concrete construction process and has no need of rolling (self-compacting molding), and has very small penetration test piece resistivity and track plate resistivity can be obtained; and the high-purity copper powder, the superfine stainless steel fibers and the graphene microchip powder particles are filled in gaps of the asphalt concrete and are tightly wrapped with the asphalt cement, so that the porosity of the asphalt mixture is reduced.
4. The invention has the advantages of both the cast asphalt concrete and the conductive asphalt concrete, and can reduce the influence of low-temperature environment on the low-temperature cracking of the steel bridge deck in the low-temperature environment in winter; the pouring asphalt concrete can be electrified in advance to generate heat before and during snowfall icing, so that ice and snow on the steel bridge deck can be removed effectively in time; compared with the traditional ice and snow removing method, the ice and snow removing method has the advantages that traffic is not required to be interrupted, the snow melting time is shortened, the environment pollution is avoided, and the environmental protection requirement advocated by China at present is met.
Drawings
FIG. 1 is a schematic diagram of resistance detection of a test piece prepared from the castable of the invention.
FIG. 2 is a flow chart of the process for preparing the conductive asphalt concrete casting of the present invention.
Detailed Description
The following examples are given to illustrate specific embodiments of the present invention, but are not intended to limit the scope of the present invention in any way.
The instruments and devices referred to in the following examples are conventional instruments and devices unless otherwise specified; the related testing and preparation methods are conventional methods unless otherwise specified.
In the following examples, the preparation of cast conductive asphalt concrete (GA-10) involves the following main raw materials:
1. conductive material: graphene nanoplatelets (YSQ-10, produced by Qingdao carbon-ocean carbon materials Co., Ltd.), high-purity copper powder (2N 8-3N, produced by Zhongnuo new materials) and superfine stainless steel fibers (Juncheng P6-P12).
2. Compound modified asphalt: the asphalt comprises SBS modified asphalt, natural lake asphalt and Sasobit modifier, wherein the SBS modified asphalt comprises the following components in parts by weight: natural lake asphalt: sasobit modifier = 75: 25: 3.
3. mineral aggregate
The aggregate grading composition is as follows: less than 0.075mm, 0.075 mm-0.15 mm, 0.15 mm-0.30 mm, 0.3 mm-0.6 mm, 0.6 mm-1.18 mm, 1.18 mm-2.36 mm, 2.36 mm-4.75 mm, 4.75 mm-9.5 mm and 9.5 mm-13.2 mm.
4. The cast conductive asphalt concrete median grading design is shown in table 1 below.
TABLE 1 GA-10 grading requirements
| Screen hole (mm) | 13.2 | 9.45 | 4.75 | 2.36 | 1.18 | 0.6 | 0.3 | 0.15 | 0.075 |
| Passage Rate (%) | 100 | 80-100 | 63-80 | 48-63 | 38-52 | 32-46 | 27-40 | 24-36 | 20-30 |
| Median grading | 100 | 90 | 71.5 | 55.5 | 45 | 39 | 33.5 | 30 | 25 |
Example 1: the conductive asphalt concrete is prepared from the following raw materials:
9 parts of SBS modified asphalt, 100 parts of mineral aggregate, 4 parts of graphene microchip, 2 parts of high-purity copper powder, 1.5 parts of superfine stainless steel fiber and a formed track plate test piece, wherein the resistivity of the formed track plate test piece is 235.6 omega-m through detection (see figure 1).
Example 2: the conductive asphalt concrete is prepared from the raw materials
9.25 parts of SBS modified asphalt, 100 parts of mineral aggregate, 4.5 parts of graphene microchip, 2.25 parts of high-purity copper powder, 1.625 parts of superfine stainless steel fiber and a formed track plate, wherein the resistivity of the formed track plate is 241.7 omega-m through detection.
Example 3: the conductive asphalt concrete is prepared from the raw materials
9.5 parts of SBS modified asphalt, 100 parts of mineral aggregate, 5 parts of graphene microchip, 2.5 parts of high-purity copper powder, 1.75 parts of superfine stainless steel fiber and a formed track plate, wherein the resistivity of the formed track plate is 192.4 omega-m through detection.
Example 4: the conductive asphalt concrete is prepared from the raw materials
9.75 parts of composite modified asphalt, 90 parts of mineral aggregate, 5.5 parts of graphene microchip, 2.75 parts of high-purity copper powder, 1.875 parts of superfine stainless steel fiber and a molded rut plate, wherein the resistivity of the formed rut plate is detected to be 93.4 omega.
Example 5: the cast conductive asphalt concrete is prepared from raw materials
The composite modified asphalt comprises 10 parts of composite modified asphalt, 100 parts of mineral aggregate, 6 parts of graphene micro-sheets, 3 parts of high-purity copper powder, 2 parts of superfine stainless steel fibers and a formed rut plate, and the resistivity of the formed rut plate is 75.3 omega-m through detection.
Example 6: the conductive asphalt concrete is prepared from the raw materials
10.25 parts of composite modified asphalt, 100 parts of mineral aggregate, 6.5 parts of graphene microchip, 3.25 parts of high-purity copper powder, 2.125 parts of superfine stainless steel fiber and a molded rut plate, wherein the resistivity of the rut plate is 44.8 omega-m through detection.
Example 7: the conductive asphalt concrete is prepared from the raw materials
10.5 parts of composite modified asphalt, 100 parts of mineral aggregate, 7 parts of graphene microchip, 3.5 parts of high-purity copper powder, 2.25 parts of superfine stainless steel fiber and a formed track plate, wherein the resistivity of the formed track plate is 32.4 omega-m through detection.
Example 8: the conductive asphalt concrete is prepared from the raw materials
10.75 parts of composite modified asphalt, 110 parts of mineral aggregate, 7.5 parts of graphene micro-sheets, 3.75 parts of high-purity copper powder, 2.375 parts of superfine stainless steel fibers and a formed rut plate, wherein the resistivity of the formed rut plate is 18.3 omega-m through detection.
Example 9: the conductive asphalt concrete is prepared from the raw materials
11 parts of composite modified asphalt, 95 parts of mineral aggregate, 8 parts of graphene microchip, 4 parts of high-purity copper powder and 2.5 parts of superfine stainless steel fiber, and the resistivity of the formed track plate is 10.7 omega-m through detection.
The performance indexes of the test pieces formed in the above examples were measured by the corresponding conventional methods, and are shown in table 2.
The preparation method of the castable for paving the conductive asphalt concrete mainly comprises the following steps (see figure 2):
(1) firstly, heating aggregate in mineral aggregate to 250 ℃, and then mixing the aggregate with SBS modified asphalt, natural lake asphalt and Sasobit modifier according to corresponding proportion for 2 min to ensure that the aggregate is uniform;
(2) then adding superfine stainless steel fibers in a corresponding proportion and mixing for 3min to ensure that the superfine stainless steel fibers are uniform;
(3) and finally, adding the graphene nanoplatelets, the high-purity copper powder and the mineral powder in the mineral aggregate according to the corresponding proportion, and uniformly mixing for 45min to obtain the conductive asphalt concrete casting material.
TABLE 2 road Performance test and conductivity test data for cast asphalt concretes obtained in examples 1-9
As can be seen from Table 2, the cast asphalt concrete of the invention meets the relevant requirements of pavement design and construction technical guidelines of highway steel box girder bridge deck, and the indexes of 240 ℃ fluidity, 60 ℃ penetration high-temperature performance, low-temperature performance and the like meet the standard requirements; the decrease of the resistivity of the cast conductive concrete is obvious, and the asphalt concrete with extremely small resistivity is obtained, which shows that the cast asphalt concrete has good conductivity.
The present invention is described in detail with reference to the examples above; however, those skilled in the art will understand that various changes may be made in the above embodiments and equivalents may be substituted for elements thereof without departing from the scope of the present disclosure, so as to form a plurality of embodiments, which are common variations of the present disclosure and will not be described in detail herein.
Claims (6)
1. The conductive asphalt concrete casting material is characterized by being prepared from the following raw materials in parts by weight:
8-15 parts of composite modified asphalt, 80-120 parts of mineral aggregate, 4-8 parts of graphene micro-sheets, 2-4 parts of high-purity copper powder and 1.5-2.5 parts of superfine stainless steel fiber.
2. The conductive asphalt concrete casting material according to claim 1, wherein the composite modified asphalt is prepared from SBS modified asphalt, natural lake asphalt and Sasobit modifier according to the weight ratio of 70-80: 20-30: 2-4 by mass ratio.
3. The conductive asphalt concrete casting according to claim 1, wherein the ultra-fine stainless steel fibers are metallic soft fibers prepared by bundle drawing using 304, 304L, 316 or/and 316L stainless steel as a base material.
4. The electrically conductive bituminous concrete casting material according to claim 1, characterized in that said mineral aggregate is a continuous graded mix based on the following size fractions: 0-0.075 mm, 0.075 mm-0.15 mm, 0.15 mm-0.30 mm, 0.30 mm-0.60 mm, 0.60 mm-1.18 mm, 1.18 mm-2.36 mm, 2.36 mm-4.75 mm, 4.75 mm-9.5 mm and 9.5 mm-13.2 mm; the mixing ratio of the coarse aggregate, the fine aggregate and the mineral powder in the mixture is determined by the oversize passing rate of each particle size.
5. A method for preparing an electrically conductive asphalt concrete casting according to claim 1, comprising the steps of:
(1) firstly, heating aggregate in mineral aggregate to 240-260 ℃, and then uniformly mixing the aggregate with SBS modified asphalt, natural lake asphalt and Sasobit modifier;
(2) then adding superfine stainless steel fibers and uniformly mixing;
(3) and finally, adding the graphene nanoplatelets, the high-purity copper powder and the mineral powder in the mineral aggregate, and uniformly mixing to obtain the conductive asphalt concrete casting material.
6. The preparation method of the conductive asphalt concrete casting according to claim 5, characterized in that the mixture is mixed for 1-3 min in the step (1); mixing for 2-4 min in the step (2); blending for 35-45 min in the step (3).
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114956665A (en) * | 2021-07-13 | 2022-08-30 | 华北水利水电大学 | Cast conductive asphalt concrete for snow melting and deicing and preparation and application thereof |
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|---|---|---|---|---|
| CN1403401A (en) * | 2002-10-11 | 2003-03-19 | 武汉理工大学 | Conducting asphalt concrete and its prepn process |
| CN105439498A (en) * | 2015-12-01 | 2016-03-30 | 长安大学 | Composite modified asphalt concrete with electrical conductivity and preparation method of composite modified asphalt concrete |
| CN106186836A (en) * | 2016-07-12 | 2016-12-07 | 王雅露 | A kind of conductivity type bituminous concrete |
| CN106380124A (en) * | 2016-08-28 | 2017-02-08 | 欧振云 | Conductive asphalt concrete |
| KR101959441B1 (en) * | 2018-10-05 | 2019-03-19 | (주)대한하이텍건설 | Fire Retardant FRP Panel Composition and Maintenance Methods of Concrete Structure Using Thereof |
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- 2020-09-24 CN CN202011017831.1A patent/CN112110681A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1403401A (en) * | 2002-10-11 | 2003-03-19 | 武汉理工大学 | Conducting asphalt concrete and its prepn process |
| CN105439498A (en) * | 2015-12-01 | 2016-03-30 | 长安大学 | Composite modified asphalt concrete with electrical conductivity and preparation method of composite modified asphalt concrete |
| CN106186836A (en) * | 2016-07-12 | 2016-12-07 | 王雅露 | A kind of conductivity type bituminous concrete |
| CN106380124A (en) * | 2016-08-28 | 2017-02-08 | 欧振云 | Conductive asphalt concrete |
| KR101959441B1 (en) * | 2018-10-05 | 2019-03-19 | (주)대한하이텍건설 | Fire Retardant FRP Panel Composition and Maintenance Methods of Concrete Structure Using Thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114956665A (en) * | 2021-07-13 | 2022-08-30 | 华北水利水电大学 | Cast conductive asphalt concrete for snow melting and deicing and preparation and application thereof |
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Application publication date: 20201222 |