CN103193421A - Method for preparing carbon fiber conductive concrete with melting snow and ice function - Google Patents
Method for preparing carbon fiber conductive concrete with melting snow and ice function Download PDFInfo
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- CN103193421A CN103193421A CN2013100786096A CN201310078609A CN103193421A CN 103193421 A CN103193421 A CN 103193421A CN 2013100786096 A CN2013100786096 A CN 2013100786096A CN 201310078609 A CN201310078609 A CN 201310078609A CN 103193421 A CN103193421 A CN 103193421A
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Abstract
The invention provides a method for preparing carbon fiber conductive concrete with melting snow and ice function, and belongs to the technical field of concrete. The method for preparing carbon fiber conductive concrete can be widely used for concrete pavement engineering construction of bridge decks and airport runways. The raw materials include cement, short carbon fibers, an admixture, sand, stone, and water, wherein water cement ratio is of 0.55-0.58, the mass of cement, sand and stone respectively account for 18%-25%, 20%-45%, and 20%-45% of total mass of the concrete, and the carbon fibers have a length of 7-13 mm and account for 0.6%-2.0% of the whole volume of the concrete. In the preparation process, the mixed water and admixture are poured into cement mortar, and then the short carbon fibers are added, and finally the stones are added to prepare the carbon fiber conductive concrete. The carbon fibers can be uniformly dispersed in the concrete, and the prepared carbon fiber conductive concrete can make use of the electrothermal effect to melt snow and ice.
Description
Technical field
The present invention relates to a kind of concrete preparation method of electric conduction of carbon fiber with deicing or snow melting function, belong to the concrete technology field, be applicable to the concrete road surface engineering construction of bridge floor, airfield runway.
Technical background
In the winter time, road accumulated snow freezes communications and transportation has been produced very ill effect.Removing on the icing method of road accumulated snow, traditional method is to adopt artificial process and mechanical process.Artificial process wastes time and energy, and can not resume traffic timely; Though mechanical process speed is fast, remove not thoroughly, and the utilization ratio of deicing machinery is low.In addition, method commonly used also has chemical thawing method, as spreads the cryosel method, but deicer salts can reduce the weather resistance of pavement concrete.
In normal concrete, add conductive paste material and be prepared into conducting concrete, utilize the electrocaloric effect of conducting concrete to come deicing or snow melting to can be used as the method that solves road accumulated snow ice formation issues.Such as adding conductive paste material graphite, steel fiber etc.But the graphite length-to-diameter ratio is too small, must could form the conductive path that is interconnected more for a long time in concrete by addition content, and this concrete strength that will cause preparing significantly reduces, and therefore can not satisfy the road with requiring; Add a certain amount of steel fiber and also can obviously reduce concrete resistivity, cause resistivity obviously to increase but steel fiber can form zone of oxidation on its surface in the alkaline environment of cement.Carbon fiber is a kind of high-performance fiber, have high strength, high-modulus, low density, premium properties such as corrosion-resistant, it is joined as conductive paste material be prepared into the electric conduction of carbon fiber concrete in the normal concrete, both solve electro-conductive material causes concrete strength to reduce because volume is excessive problem, and also avoided electro-conductive material to make concrete along with the shortcoming of the prolongation resistivity increase of time because of surface oxidation.
Summary of the invention
Carbon fiber surface has hydrophobicity, is difficult for disperseing in concrete, causes the concrete resistivity prepared bigger, and electroconductibility is lower.Be to form the carbon fiber aqueous dispersion earlier about electric conduction of carbon fiber concrete preparation method commonly used at present, add cement again and form the carbon-fiber cement slurry, add sandstone at last and stir into carbon fiber reinforced concrete, perhaps in the carbon fiber aqueous dispersion, directly add the concrete wet feed, stir then and be prepared into carbon fiber reinforced concrete.But through contriver's practice, these two kinds of methods can not make carbon fiber well disperse in concrete, and the electric conduction of carbon fiber concrete resistivity of preparing is bigger, poorly conductive.The purpose of this invention is to provide a kind of concrete preparation method of electric conduction of carbon fiber with deicing or snow melting function, carbon fiber can evenly be disperseed in concrete, the resistivity of conducting concrete is reduced, electroconductibility strengthens, and has improved the utilization ratio of carbon fiber.
For achieving the above object, the present invention has adopted following technical scheme:
A kind of concrete preparation method of electric conduction of carbon fiber with deicing or snow melting function, it is characterized in that: its material component comprises cement, chopped carbon fiber, adulterant, sand, stone, water, wherein water cement ratio is 0.55～0.58, cement, sand, stone account for 18%～25%, 20%～45%, 20%～45% of concrete total mass respectively, chopped carbon fiber length is 7～13mm, volume is 0.6%～2.0% of whole volume of concrete by the percentage calculation that accounts for electric conduction of carbon fiber concrete cumulative volume;
The weight of described adulterant is no more than 10% of cement weight.
Described adulterant comprises water reducer, dispersion agent, defoamer, can improve the material of concrete performance.The volume of water reducer is 0.5%～2.0% of gelling material quality, and the volume of dispersion agent is 0.4%～0.8% of gelling material quality, and the volume of defoamer is about 0.12%～0.15% of whole volume of concrete.
Described sand is natural sand or artificial sand, and the particle diameter of sand is not more than 5mm, and the consumption of pressing dry sand calculates, if the sand that adopts is damp sand, the weight of water in the damp sand should be counted in the consumption of water.
Described water reducer weight does not comprise the weight of water in the water reducer, if water reducer contains water, during calculating water is wherein converted in the consumption of water.
Described water should meet the regulation of " concrete mixing water supply standard " JGJ63-89;
A kind of concrete preparation method of electric conduction of carbon fiber with deicing or snow melting function, making step comprises as follows:
In water, add adulterant, stir, make adulterant water-soluble fully, obtain the aqueous solution of adulterant; According to proportioning cement, sand are mixed, after stirring, and add the aqueous solution of above-mentioned adulterant, add chopped carbon fiber after stirring into sand-cement slurry, stirring is prepared into the carbon-fiber cement mortar, utilizes the effect of sand-cement slurry to help the even dispersion of carbon fiber in slurry; In the carbon-fiber cement mortar, add stone, stir aftershaping maintenance in 3～5 minutes.
Beneficial effect of the present invention is as follows:
This conducting concrete adopts chopped carbon fiber as the conductive phase component, compares with the concrete that mixes graphite, owing to length-to-diameter ratio is big, has avoided mixing too much causing strength degradation; Compare with the concrete that mixes steel fiber, because carbon fiber is corrosion-resistant, avoided the later stage concrete because the problem that the conductive paste material oxidation causes concrete resistivity to increase.
By improving the concrete preparation process of electric conduction of carbon fiber, improved the dispersiveness of carbon fiber in concrete, the resistivity of conducting concrete is reduced, electroconductibility strengthens, and has improved the utilization ratio of carbon fiber.
In use rationally use by the addition to adulterant and optimize, can improve the workability after the electric conduction of carbon fiber concrete stirs, also help to improve the concrete intensity of electric conduction of carbon fiber, and improve the economy of material.
Embodiment
The invention will be further described below in conjunction with embodiment, but the present invention is not limited to following examples.
Technical scheme
The following typical material mix proportion that embodiment adopts following (Comparative Examples 1,2 adopts and embodiment 1 identical materials proportioning):
For material used in the form:
Used cement is ordinary Portland cement, and grade is 42.5;
Used sand is natural medium sand, and the quality of form medium sand is the quality of damp sand, and the water ratio of sand is 2.5%;
Used stone is rubble, and median size is 10mm;
Used water meets the regulation of " concrete mixing water supply standard " JGJ63-89, and the quality of water is the quality of the water after moisture in the removal damp sand in the last form;
Used carbon fiber diameter 7 μ m, length 12mm, density 1.78 * 10
3Kg/m
3
Used water reducer is polycarboxylate water-reducer;
Used dispersion agent is Vltra tears;
Used defoamer is the compound defoamer of PRS-6 (liquid).
Its making processes is as follows:
Comparative Examples 1:
Water, water reducer, dispersion agent and defoamer poured in the agitation vat and with stirring rod stir; evenly add carbon fiber in the agitation vat; stir 5 minutes formation carbon fiber aqueous dispersions with stirring rod; be poured in the stirrer; add cement then and stirred 1 minute, pour sand and stone in stirrer stirring shutdown after 3 minutes at last.
Comparative Examples 2:
Pour part water, part water reducer, dispersion agent and defoamer into agitation vat and stir with stirring rod, carbon fiber is evenly added to stir in the agitation vat formed the carbon fiber aqueous dispersion in 5 minutes; Sand and stone poured into form concrete drier in the stirrer, add remaining water (having added remaining water reducer), stirred 1 minute, form the concrete wet feed, add the carbon fiber aqueous dispersion in the previous agitation vat this moment, continue to stir after 3 minutes and shut down.
Embodiment 1～4:
Load weighted cement and sand poured in the stirrer stirred 1 minute; then the mixing solutions of the water, water reducer, dispersion agent and the defoamer that stir is poured in the stirrer; stir after 1 minute carbon fiber is sprinkled in the stirrer equably and stirred 1 minute; pour stone into stirrer then, stir after 3 minutes and shut down.
With Comparative Examples 1,2 and the compound that stirs of embodiment 1～4 pour the punching block of 160mm * 130mm * 40mm into, stainless steel electrode is imbedded at the test specimen two ends simultaneously, draw lead, behind vibratory compaction on the shaking table, move into the indoor maintenance of normal curing, maintenance demoulding after 1～2 day.Measure the resistance of test specimen after 7 days.
3 test specimens have respectively been prepared with Comparative Examples 1, Comparative Examples 2 and embodiment 1.Measuring result is as follows:
| ? | Comparative Examples 1 | Comparative Examples 2 | Embodiment 1 |
| Average resistance (Ω) | 34.9 | 23.6 | 9.7 |
| Average resistivity (Ω cm) | 113.4 | 76.7 | 31.5 |
Through experimental test, embodiment 1 used production program has improved the dispersiveness of carbon fiber in concrete, its resistivity is compared with the average resistivity of Comparative Examples 2 with Comparative Examples 1, reduced by 58.9% and 72.2% respectively, illustrated that embodiment 1 used production program obviously reduces the resistivity of conducting concrete, electroconductibility significantly strengthens, and has improved the utilization ratio of carbon fiber.
3 test specimens have respectively been prepared with embodiment 2～4.Measuring result is as follows:
| ? | Embodiment 2 | Embodiment 3 | Embodiment 4 |
| Average resistance (Ω) | 12.1 | 17.8 | 18.2 |
| Average resistivity (Ω cm) | 39.3 | 57.9 | 59.2 |
By the measuring result of embodiment 1～3 as can be known: the resistivity of test specimen reduces along with the increase of carbon fiber volume content, be that electroconductibility increases along with the increase of carbon fiber volume content, this mainly is because carbon fiber volume content increases, and makes carbon fiber can well overlap the formation conductive path each other; By embodiment 1,4 measuring result as can be known: within the specific limits, sand coarse aggregate ratio is more big, and then the resistivity of test specimen is more little, electroconductibility is more poor, this mainly is because the ratio of sand is more big, has influenced the mutual overlap joint between the carbon fiber, and then has influenced the formation of good conductive path in the concrete.
Explanation is at last, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although with reference to preferred embodiment the present invention is had been described in detail, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement technical scheme of the present invention, and not breaking away from aim and the scope of technical solution of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (5)
1. concrete preparation method of electric conduction of carbon fiber with deicing or snow melting function, it is characterized in that: its material component comprises cement, chopped carbon fiber, adulterant, sand, stone, water, wherein water cement ratio is 0.55～0.58, cement, sand, stone account for 18%～25%, 20%～45%, 20%～45% of concrete total mass respectively, chopped carbon fiber length is 7～13mm, volume is 0.6%～2.0% of whole volume of concrete by the percentage calculation that accounts for electric conduction of carbon fiber concrete cumulative volume;
Making step comprises as follows:
In water, add adulterant, stir, make adulterant water-soluble fully, obtain the aqueous solution of adulterant; According to proportioning cement, sand are mixed, after stirring, and add the aqueous solution of above-mentioned adulterant, add chopped carbon fiber after stirring into sand-cement slurry, stirring is prepared into the carbon-fiber cement mortar, utilizes the effect of sand-cement slurry to help the even dispersion of carbon fiber in slurry; In the carbon-fiber cement mortar, add stone, stir aftershaping maintenance in 3～5 minutes.
2. according to the method for claim 1, it is characterized in that the weight of described adulterant is no more than 10% of cement weight.
3. according to the method for claim 1, it is characterized in that, described adulterant comprises water reducer, dispersion agent, defoamer, the volume of water reducer is 0.5%～2.0% of gelling material quality, the volume of dispersion agent is 0.4%～0.8% of gelling material quality, and the volume of defoamer is about 0.12%～0.15% of whole volume of concrete.
4. according to the method for claim 1, it is characterized in that described sand is natural sand or artificial sand, the particle diameter of sand is not more than 5mm, and the consumption of pressing dry sand calculates, if the sand that adopts is damp sand, the weight of water in the damp sand should be counted in the consumption of water.
5. according to the method for claim 1, it is characterized in that described water reducer weight does not comprise the weight of water in the water reducer, if water reducer contains water, during calculating water is wherein converted in the consumption of water.
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| CN201310078609.6A CN103193421B (en) | 2013-03-12 | 2013-03-12 | Method for preparing carbon fiber conductive concrete with melting snow and ice function |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103420647A (en) * | 2013-07-25 | 2013-12-04 | 南京航空航天大学 | Conductive material co-doping conductive concrete and preparation method thereof |
| CN104864995A (en) * | 2015-05-22 | 2015-08-26 | 西安近代化学研究所 | Carbon fiber concrete sensing element capable of perceiving impact load |
| CN105272048A (en) * | 2015-11-13 | 2016-01-27 | 哈尔滨工业大学 | Strain self-sensing multi-scale carbon-cement composite pavement material capable of melting snow and ice |
| CN107140906A (en) * | 2017-05-03 | 2017-09-08 | 中国人民解放军空军工程大学 | Carbon fibre reinforced concrete for road microwave ice removing and preparation method thereof |
| CN108314389A (en) * | 2018-05-11 | 2018-07-24 | 威海南海碳材料科技研究院有限公司 | A kind of concrete of fibre reinforced and preparation method thereof |
| CN109853319A (en) * | 2019-02-27 | 2019-06-07 | 华侨大学 | A kind of snow melt deicing composite construction porous pavement of Route for pedestrians and preparation method thereof |
| CN112794685A (en) * | 2021-01-04 | 2021-05-14 | 长安大学 | Pavement concrete structure for deicing and preparation method thereof |
| CN114109453A (en) * | 2021-11-05 | 2022-03-01 | 重庆交通大学 | Automatic heat preservation control structure of traffic tunnel in frozen soil district in season |
| CN114349434A (en) * | 2022-01-27 | 2022-04-15 | 长安大学 | Wave-absorbing concrete for improving uniformity of temperature field of pavement under action of microwaves and preparation method thereof |
| CN117776634A (en) * | 2024-02-28 | 2024-03-29 | 内蒙古工业大学 | Conductive concrete based on solid waste conductive phase and preparation method thereof |
-
2013
- 2013-03-12 CN CN201310078609.6A patent/CN103193421B/en active Active
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103420647A (en) * | 2013-07-25 | 2013-12-04 | 南京航空航天大学 | Conductive material co-doping conductive concrete and preparation method thereof |
| CN104864995A (en) * | 2015-05-22 | 2015-08-26 | 西安近代化学研究所 | Carbon fiber concrete sensing element capable of perceiving impact load |
| CN105272048A (en) * | 2015-11-13 | 2016-01-27 | 哈尔滨工业大学 | Strain self-sensing multi-scale carbon-cement composite pavement material capable of melting snow and ice |
| CN107140906A (en) * | 2017-05-03 | 2017-09-08 | 中国人民解放军空军工程大学 | Carbon fibre reinforced concrete for road microwave ice removing and preparation method thereof |
| CN108314389A (en) * | 2018-05-11 | 2018-07-24 | 威海南海碳材料科技研究院有限公司 | A kind of concrete of fibre reinforced and preparation method thereof |
| CN109853319A (en) * | 2019-02-27 | 2019-06-07 | 华侨大学 | A kind of snow melt deicing composite construction porous pavement of Route for pedestrians and preparation method thereof |
| CN112794685A (en) * | 2021-01-04 | 2021-05-14 | 长安大学 | Pavement concrete structure for deicing and preparation method thereof |
| CN114109453A (en) * | 2021-11-05 | 2022-03-01 | 重庆交通大学 | Automatic heat preservation control structure of traffic tunnel in frozen soil district in season |
| CN114349434A (en) * | 2022-01-27 | 2022-04-15 | 长安大学 | Wave-absorbing concrete for improving uniformity of temperature field of pavement under action of microwaves and preparation method thereof |
| CN117776634A (en) * | 2024-02-28 | 2024-03-29 | 内蒙古工业大学 | Conductive concrete based on solid waste conductive phase and preparation method thereof |
| CN117776634B (en) * | 2024-02-28 | 2024-05-07 | 内蒙古工业大学 | Conductive concrete based on solid waste conductive phase and preparation method thereof |
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| CN103193421B (en) | 2014-12-31 |
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Effective date of registration: 20171205 Address after: 100101 No. 111 East Fourth Ring Road, Chaoyang District, Beijing Co-patentee after: Beijing University of Technology Patentee after: Civil Airports of China construction group company Address before: 100621 No. five latitude road 2, capital airport, Beijing, Chaoyang District Co-patentee before: Beijing University of Technology Patentee before: Beijing Zhongqi Zhuochuang Technology Development Co., Ltd. |
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Address after: 100101 No. 111 East Fourth Ring Road, Chaoyang District, Beijing Co-patentee after: Beijing University of Technology Patentee after: CAAC Airport Construction Group Co.,Ltd. Address before: 100101 No. 111 East Fourth Ring Road, Chaoyang District, Beijing Co-patentee before: Beijing University of Technology Patentee before: CHINA AIRPORT CONSTRUCTION Group Corp. |