CN103193421B - 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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- CN103193421B CN103193421B CN201310078609.6A CN201310078609A CN103193421B CN 103193421 B CN103193421 B CN 103193421B CN 201310078609 A CN201310078609 A CN 201310078609A CN 103193421 B CN103193421 B CN 103193421B
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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 preparation method with the Carbon Fiber Reinforced Conductive Concrete of deicing or snow melting function, belong to technical field of concrete, be applicable to the concrete road surface engineering construction of bridge floor, airfield runway.
Technical background
In the winter time, road snow mantle freezes and creates very ill effect to communications and transportation.Removing in the icing method of road snow mantle, traditional method adopts artificial process and mechanical process.Artificial process wastes time and energy, and can not resume traffic timely; Although mechanical process speed is fast, remove not thorough, and the utilization ratio of deicing machinery is low.In addition, conventional method also has chemical thawing method, and as spread cryosel method, but deicer salts can reduce the weather resistance of pavement concrete.
In normal concrete, add conductive paste material be prepared into conducting concrete, utilizing the electrocaloric effect of conducting concrete to carry out deicing or snow melting can as the method for solving road accumulated snow ice formation issues.Such as add conductive paste material graphite, steel fiber etc.But graphite length-to-diameter ratio is too small, must addition content more time could form the conductive path be interconnected in concrete, this will cause the concrete strength prepared significantly to reduce, and therefore can not meet road with requiring; Add a certain amount of steel fiber and also can obviously reduce concrete resistivity, but steel fiber can form zone of oxidation on its surface in the alkaline environment of cement causes resistivity obviously to increase.Carbon fiber is a kind of high-performance fiber, there is high strength, high-modulus, low density, the premium properties such as corrosion-resistant, it can be used as conductive paste material to join in normal concrete and be prepared into Carbon Fiber Reinforced Conductive Concrete, both solve the problem that electro-conductive material causes concrete strength to reduce because volume is excessive, it also avoid the shortcoming that electro-conductive material makes concrete increase along with the prolongation resistivity of time because of surface oxidation.
Summary of the invention
Carbon fiber surface has hydrophobicity, not easily disperses in concrete, and cause the concrete resistivity prepared comparatively large, electroconductibility is lower.The preparation method commonly used about Carbon Fiber Reinforced Conductive Concrete at present first forms carbon fiber aqueous dispersion, add cement again and form carbon fiber water mud, finally add sandstone and stir into carbon fiber reinforced concrete, or in carbon fiber aqueous dispersion, directly add concrete wet feed, then stir 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, the Carbon Fiber Reinforced Conductive Concrete resistivity prepared is comparatively large, poorly conductive.The object of this invention is to provide a kind of preparation method with the Carbon Fiber Reinforced Conductive Concrete of deicing or snow melting function, make carbon fiber can be dispersed in concrete, the resistivity of conducting concrete is reduced, electroconductibility strengthens, and improves the utilization ratio of carbon fiber.
For achieving the above object, present invention employs following technical scheme:
A kind of preparation method with the Carbon Fiber Reinforced Conductive Concrete of 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, by the percentage calculation accounting for Carbon Fiber Reinforced Conductive Concrete cumulative volume, is 0.6% ~ 2.0% of whole volume of concrete;
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, by the Dosage calculation of dry sand, according to sand be damp sand, the weight of water in damp sand should be counted in the consumption of water.
Described water reducer weight does not comprise the weight of water in 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;
Have a preparation method for the Carbon Fiber Reinforced Conductive Concrete of deicing or snow melting function, making step comprises as follows:
In water, add adulterant, stir, make adulterant completely water-soluble, obtain the aqueous solution of adulterant; According to proportioning by cement, sand mixing, after stirring, and add the aqueous solution of above-mentioned adulterant, after stirring into sand-cement slurry, add chopped carbon fiber, stirring is prepared into carbon fibers reinforced mortar, and what utilize the effect of sand-cement slurry to help carbon fiber in slurry is dispersed; In carbon fibers reinforced 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 conductive phase component, compared with the concrete mixing graphite, because length-to-diameter ratio is large, avoids to mix too much to cause strength degradation; Compared with the concrete of mixing of steel fiber, because carbon fiber is corrosion-resistant, avoid later stage concrete due to conductive paste material and be oxidized the problem causing concrete resistivity to increase.
By improving the preparation process of Carbon Fiber Reinforced Conductive Concrete, improve the dispersiveness of carbon fiber in concrete, the resistivity of conducting concrete is reduced, electroconductibility strengthens, and improves the utilization ratio of carbon fiber.
In use pass through the addition reasonable employment to adulterant and optimization, the workability after Carbon Fiber Reinforced Conductive Concrete stirring can be improved, also contribute to the intensity improving Carbon Fiber Reinforced Conductive Concrete, and improve the economy of material.
Embodiment
Below in conjunction with embodiment, the invention will be further described, but the present invention is not limited to following examples.
Technical scheme
The following typical material mix proportion that embodiment adopts following (comparative example 1,2 adopts the material mix proportion identical with embodiment 1):
Material for used in form:
Cement used is ordinary Portland cement, and grade is 42.5;
Sand used is nature medium sand, and the quality of form medium sand is the quality of damp sand, and the water ratio of sand is 2.5%;
Stone used is rubble, and median size is 10mm;
Water used meets the regulation of " concrete mixing water supply standard " JGJ63-89, in upper form water quality by remove moisture in damp sand after the quality of water;
Carbon fiber diameter used 7 μm, length 12mm, density 1.78 × 10
3kg/m
3;
Water reducer used is polycarboxylate water-reducer;
Dispersion agent used is Vltra tears;
Defoamer used is PRS-6 composite anti-foaming agent (liquid).
Its making processes is as follows:
Comparative example 1:
Water, water reducer, dispersion agent and defoamer to be poured in agitation vat and to stir by stirring rod; carbon fiber is evenly added in agitation vat; stir by stirring rod and form carbon fiber aqueous dispersion in 5 minutes; be poured in stirrer; then add cement mixing 1 minute, finally sand and stone are poured in stirrer to stir after 3 minutes and shut down.
Comparative example 2:
Part water, part water reducer, dispersion agent and defoamer are poured into agitation vat and stirred by stirring rod, carbon fiber is evenly added in agitation vat and stir 5 minutes formation carbon fiber aqueous dispersions; Sand and stone are poured in stirrer and forms concrete drier, add remaining water (having added remaining water reducer), stir 1 minute, form concrete wet feed, now add the carbon fiber aqueous dispersion in previous agitation vat, continue stirring and shut down after 3 minutes.
Embodiment 1 ~ 4:
Load weighted cement and sand are poured in stirrer and stir 1 minute; then the mixing solutions of the water stirred, water reducer, dispersion agent and defoamer is poured in stirrer; stir after 1 minute, carbon fiber to be sprinkled into equably in stirrer and stir 1 minute; then pour stone into stirrer, stir after 3 minutes and shut down.
The compound that comparative example 1,2 and embodiment 1 ~ 4 are stirred is poured into the punching block of 160mm × 130mm × 40mm, stainless steel electrode is imbedded at test specimen two ends simultaneously, draw wire, move into the indoor maintenance of normal curing on a vibration table after vibratory compaction, maintenance demoulding after 1 ~ 2 day.Within 7 days, measure the resistance of test specimen afterwards.
3 test specimens have respectively been prepared by comparative example 1, comparative example 2 and embodiment 1.Measuring result is as follows:
| ? | Comparative example 1 | Comparative example 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 production program used improves the dispersiveness of carbon fiber in concrete, its resistivity is compared with the average resistivity of comparative example 1 with comparative example 2, reduce 58.9% and 72.2% respectively, describing embodiment 1 production program used makes the resistivity of conducting concrete obviously reduce, electroconductibility significantly strengthens, and improves the utilization ratio of carbon fiber.
3 test specimens have respectively been prepared by 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 |
Measuring result from embodiment 1 ~ 3: the resistivity of test specimen reduces along with the increase of carbon fiber volume content, namely electroconductibility increases along with the increase of carbon fiber volume content, this mainly because carbon fiber volume content increases, makes carbon fiber can well overlap formation conductive path each other; Measuring result from embodiment 1,4: within the specific limits, sand coarse aggregate ratio is larger, then the resistivity of test specimen is less, electroconductibility is poorer, this mainly because the ratio of sand is larger, have impact on the mutual overlap joint between carbon fiber, and then have impact on the formation of good conductive path in concrete.
What finally illustrate is, above embodiment is only in order to illustrate technical scheme of the present invention and unrestricted, although with reference to preferred embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that, can modify to technical scheme of the present invention or equivalent replacement, and not departing from aim and the scope of technical solution of the present invention, it all should be encompassed in the middle of right of the present invention.
Claims (4)
1. one kind has the preparation method of the Carbon Fiber Reinforced Conductive Concrete of 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, by the percentage calculation accounting for Carbon Fiber Reinforced Conductive Concrete cumulative volume, is 0.6% ~ 2.0% of whole volume of concrete;
Making step comprises as follows:
In water, add adulterant, stir, make adulterant completely water-soluble, obtain the aqueous solution of adulterant; According to proportioning by cement, sand mixing, after stirring, and add the aqueous solution of above-mentioned adulterant, after stirring into sand-cement slurry, add chopped carbon fiber, stirring is prepared into carbon fibers reinforced mortar, and what utilize the effect of sand-cement slurry to help carbon fiber in slurry is dispersed; In carbon fibers reinforced mortar, add stone, stir aftershaping maintenance in 3 ~ 5 minutes;
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 0.12% ~ 0.15% of whole volume of concrete.
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 sand is natural sand or artificial sand, and the particle diameter of sand is not more than 5mm, by the Dosage calculation of dry sand, according to sand be damp sand, the weight of water in damp sand should be counted in the consumption of water.
4. according to the method for claim 1, it is characterized in that, described water reducer weight does not comprise the weight of water in water reducer, if water reducer contains water, during calculating, water is wherein converted in the consumption of water.
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Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103420647B (en) * | 2013-07-25 | 2015-02-04 | 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 |
| CN112794685B (en) * | 2021-01-04 | 2022-11-11 | 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 |
| 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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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. |
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