CN103664095B - A kind of conducting concrete and preparation method thereof - Google Patents
A kind of conducting concrete and preparation method thereof Download PDFInfo
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- CN103664095B CN103664095B CN201310565755.1A CN201310565755A CN103664095B CN 103664095 B CN103664095 B CN 103664095B CN 201310565755 A CN201310565755 A CN 201310565755A CN 103664095 B CN103664095 B CN 103664095B
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Abstract
The present invention relates to building material technical field, particularly a kind of conducting concrete and preparation method thereof, comprise following composition: bag carbon stainless steel fiber? 1-10 part; 42.5R composite Portland cement? 10-30 part; Standard river sand? 0-30 part; Silicon ash? 1-5 part; Methylcellulose gum? 0.1-5 part; Polyether antifoam agent GPE? 0.1-3 part; Deionized water? 5-30 part; Stone chippings 2-8 part; Concrete flexural strength of the present invention and ultimate compression strength can reach the best level of prior art, and its resistivity is but far superior to existing level simultaneously, and does not need expensive device, and technical process is simple, and production cost is low, is more suitable for applying.
Description
Technical field
The present invention relates to building material technical field, particularly a kind of conducting concrete and preparation method thereof.
Background technology
Conducting concrete is the conductive component material adding certain content in normal concrete, by components such as gelling material, electro-conductive material, dielectric aggregate and water, according to the novel concrete based composites of certain proportioning condensation by mixing, there is the electrical property of regulation and the new concrete of certain mechanical property.The feature of conducting concrete existing structure material, there is again electroconductibility and alert and resourceful characteristic, concrete is not only used as a kind of structured material, and in electrician, industrial electrostatic prevention, building and heating, electric heater, power equipment earth work and great Civil Infrastructure Systems etc., there is vital role.
Graphite is the good inorganic materials comparatively easily obtained, and it not only has good electroconductibility (carbon content is greater than 80%, and its resistivity is not more than 0.5 Ω cm usually), thermal conductivity, also has the advantages such as stable chemical nature, acid and alkali-resistance, good in oxidation resistance.Therefore, existing conducting concrete adopts graphite to make electro-conductive material usually.But powdered graphite needs concrete just can be made to have stronger conductivity compared with high additive, and concrete intensity declines fast along with the volume increase of Graphite Powder 99.
Steel fiber has the advantage improving the mechanical properties such as concrete tension, bending resistance, shearing resistance, also can play its conducting function as metal simultaneously, but, along with the prolongation of time, Steel Fiber Reinforced Concrete is due to its high alkalinity environment, metal easily produces passive film, causes concrete resistivity obviously to increase.
Publication No. is that the patent of invention of CN103102092A discloses a kind of concrete modifying agent and concrete, comprising: carbon nanotube 10 ~ 80 weight part; Major ingredient 2 ~ 7 weight part of cement and/or cement; ACRYLIC EMULSION 5 ~ 10 weight part.This invention adopts carbon nanotube as electro-conductive material, and interpolation can obtain good electrical property on a small quantity and improve effect, and less for impacts such as concrete mechanical property, rush current tolerance performances.Under its concrete drying conditions prepared, resistivity can be less than 1.64 Ω m, and folding strength can reach 8.9MPa, and ultimate compression strength can reach 44.1MPa.Although this invention can solve the problems referred to above of existing conducting concrete, because the axis of carbon nanotube is to better performances, it is radial to performance then non-constant.Conventional method is difficult to keep it to arrange all vertically, and therefore its resistivity is higher, and conductivity is poor.If ensure its conductivity, when being added concrete, need the whole of carbon nanotube to arrange vertically, this just considerably increases the difficulty of preparation technology, causes cost to increase, and is difficult to apply.
Summary of the invention
Technical problem to be solved by this invention is to provide the simple and good conductivity of a kind of preparation technology, the conducting concrete that corrosion-resistant, intensity is high and preparation method thereof.
In order to solve the problems of the technologies described above, the invention provides following technical scheme:
A kind of conducting concrete, by weight percentage, comprises following composition:
Bag carbon stainless steel fiber 1-10 part;
42.5R composite Portland cement 10-30 part;
Standard river sand 10-30 part;
Silicon ash 1-5 part;
Methylcellulose gum 0.1-5 part;
Polyether antifoam agent GPE0.1-3 part;
Deionized water 5-30 part;
Stone chippings 2-8 part.
Above-mentioned conducting concrete preparation method, comprises the following steps:
A. the preparation of bag carbon stainless steel fiber: Stainless Steel Fibre and carbon matrix precursor are fed intake according to the mass ratio of 10-5:1, and ultrasonic or mechanical stirring is uniformly dispersed, adopt hydrothermal method, temperature of reaction is 100-300 DEG C, and the reaction times is 1-5h;
B. methylcellulose gum, bag carbon stainless steel fiber and deionized water are put into stirrer stirring at low speed;
C., after the solution in step b stirs and disperses, add cement, silicon ash, deionized water, and stirrer is placed in high-speed stirring state, until bag carbon stainless steel fiber, graphite etc. are dispersed in cement mortar;
D. the cement mortar that then just step c obtains pours into mould, and puts into standard curing room maintenance demoulding after 24 hours, obtains work in-process;
E. keep surface of semi-finished moistening, maintenance obtains conducting concrete finished product after extremely specifying the length of time.
Further, in described step a, carbon matrix precursor is: one or more in maltose, glucose, Mierocrystalline cellulose, chitosan.
Further, in described step a, in hydrothermal reaction process, add vinylformic acid, acrylic acid interpolation volume is the 1%-10% of reaction solution volume.
Further, the length of described Stainless Steel Fibre is about 35mm, and diameter is 0.5mm.
Compared with prior art, the present invention has following beneficial effect:
1. the present invention adopts bag carbon stainless steel fiber as electro-conductive material; Bag carbon stainless steel fiber one or more the Stainless Steel Fibre that to be coated with carbon precursor be in maltose, glucose, Mierocrystalline cellulose; Cover because its surface is carbonized thing, effectively can completely cut off the contact of source of corrosion and metallic ground body, possess outstanding conductivity simultaneously, ensure that the ground connection drainage effect that ground connector can remain good, and do not affect concrete intensity; Experimental result shows, under concrete drying regime of the present invention, resistivity can be less than 0.5 Ω m, and folding strength can reach 8.6MPa, and ultimate compression strength can reach 43.9MPa; Namely concrete ultimate compression strength of the present invention and folding strength can be consistent with publication No. concrete disclosed in the patent of invention of CN103102092A, but resistivity is but far smaller than the minimum value that it can reach, and therefore conductive effect is better;
2. the present invention adopts methylcellulose gum to play dispersion agent effect, the interfacial tension between liquid-liquid and solid-liquid can be reduced, bag carbon stainless steel fiber is made to be dispersed in the middle of concrete uniformly, make it in cement, form stable suspensoid, avoiding bag carbon stainless steel fiber to reunite or the phenomenon of the person of dividing because shelving, guaranteeing that conductivity is more stable.
3. the raw material of conducting concrete of the present invention just wide material sources, cheap; And preparation process is carried out at ambient pressure, and mostly completed by stirring, do not need expensive device, technical process is simple, and production cost is low.
4. vinylformic acid can improve the carboxyl-content on Stainless Steel Fibre surface, carboxyl is hydroaropic substance, with cement, there is good immersional wetting, significantly can improve the problem of the poor compatibility of current Stainless Steel Fibre and cement, reduce the interfacial tension between Stainless Steel Fibre and cement, thus the resistance to compression of raising conducting concrete, fracture resistance and conductivity.
Embodiment
The weight distribution ratio of each component raw material medicine of conducting concrete of the present invention is as follows:
Below for wherein one group of component of embodiment in table, describe preparation method of the present invention in detail:
A. the preparation of bag carbon stainless steel fiber:
Get carbon matrix precursor (maltose, glucose and cellulosic mixture) 20 parts, stainless steel hydrothermal reaction kettle is placed in together with 100 parts of Stainless Steel Fibres, and stir, controlling temperature of reaction is 300 DEG C, reaction times is 2h, reacted Stainless Steel Fibre centrifugation is obtained purifying bag carbon stainless steel fiber;
Bag carbon stainless steel fiber through purifies and separates process is placed in stainless steel hydrothermal reaction kettle, add 2 parts of vinylformic acid simultaneously, controlling temperature of reaction is 200 degree, reaction times is 2h, and the Stainless Steel Fibre centrifugation purifying after reaction terminates, surface being surrounded by carboxyl obtains hydrophilic bag carbon stainless steel fiber;
B. the bag carbon stainless steel fiber of preparation in methylcellulose gum, deionized water and embodiment 1 is put into the first stirring at low speed 5min of stirrer in proportion, then high-speed stirring 30min;
C. rapid b obtains adding 42.5R composite Portland cement, standard river sand and silicon ash in mixed solution, and controlling stirring velocity is 280 revs/min, and churning time is 20min;
D. add stone chippings and polyether antifoam agent GPE, controlling stirring velocity is 280 revs/min, and churning time is 30min;
E. encapsulate in concrete depositing steps d obtained to mould, the maintenance demoulding in 24 hours in fixed temperature and humidity curing room, took out after 28 days, the conducting concrete module of system.
Wherein, carbon matrix precursor can also by the mixture of maltose, glucose, Mierocrystalline cellulose and chitosan, or their any one or multiple replacement.
The length of Stainless Steel Fibre is about 35mm, and diameter is 0.5mm.
Embodiment 7
Conducting concrete obtained by proportioning by embodiment 1-embodiment 6 is tested as follows: resistivity measurement: during mold, the stainless (steel) wire of 39mm × 45mm is installed respectively as conductive electrode in concrete two ends, during test, just resistance meter test electrode clamps with the conducting concrete module two end electrodes of 40mm × 40mm × 160mm respectively, reads the direct current resistance R of resistance value and conducting concrete after resistance meter test value is stablized.The volume specific resistance of conducting concrete adopts formula Q=R (S/L) to calculate, and wherein S is electrode area, and L is the length of conducting concrete.
Folding strength is tested: two movable support of adjustment Intensity of Breaking Tester, itself and trier push-down head width between centers is made to be 80mm, and screw two bearings. by the conducting concrete module patterned sides after standard conditions maintenance upward, after geometry centering, slowly add a first load, about lkN, then with the loading speed of 0.5 ~ 0.7MPa/s, evenly and continuously loading; When test specimen starts distortion rapidly close to destroying, Adjustment Tests machine oil door should be stopped, until test specimen destroys, writing down fully-factored load.When section occurs between two loading points, folding strength p=FL/bh
2(F-ultimate load (N), L-support distance, b-specimen width (mm), b-specimen width (mm)).
Intensity test: be upper and lower load face with the conducting concrete module patterned sides after standard conditions maintenance, module is appropriate to be placed on ball seat, pressing machine center put by ball seat, geometry centering (referring to that test specimen or ball seat depart from board center within 5mm, lower same), with the loading continuously and equably of the speed of 0.3 ~ 0.5MPa/s, when test specimen starts to be out of shape close to destroying, Adjustment Tests machine oil door should be stopped, until test specimen destroys, write down breaking limit load.(F is ultimate load (N), A is load area (mm to concrete cube test specimen ultimate compression strength p=F/A
2)).
Test result is as follows:
| The conduction prepared by the proportioning of embodiment 1 mixes earth | The conduction prepared by the proportioning of embodiment 2 mixes earth | The conduction prepared by the proportioning of embodiment 3 mixes earth | The conduction prepared by the proportioning of embodiment 4 mixes earth | The conduction prepared by the proportioning of embodiment 5 mixes earth | The conduction prepared by the proportioning of embodiment 6 mixes earth | |
| Resistivity | 0.4Ω·m | 0.1Ω·m | 0.44Ω·m | 0.15Ω·m | 0.05Ω·m | 0.24Ω·m |
| Folding strength | 7.9MPa | 7.0 MPa | 7.5MPa | 8.6MPa | 6.9MPa | 7.2MPa |
| Ultimate compression strength | 42.1MPa | 37.9MPa | 39.2MPa | 43.9MPa | 38.5MPa | 39.8 MPa |
As can be seen from the above table, concrete resistivity of the present invention can be less than 0.5 Ω m, and folding strength can reach 8.6MPa, and ultimate compression strength can reach 43.9MPa.Concrete flexural strength of the present invention and ultimate compression strength can reach the best level of prior art, and its resistivity is but far superior to existing level simultaneously, and does not need expensive device, and technical process is simple, and production cost is low, is more suitable for applying.
Above-described is only the preferred embodiment of the present invention; should be understood that; for a person skilled in the art; under the prerequisite not departing from structure of the present invention; some distortion and improvement can also be made; these also should be considered as protection scope of the present invention, and these all can not affect effect of the invention process and practical applicability.
Claims (4)
1. a conducting concrete, is characterized in that, by weight percentage, comprises following composition:
Bag carbon stainless steel fiber 1-10 part;
42.5R composite Portland cement 10-30 part;
Standard river sand 10-30 part;
Silicon ash 1-5 part;
Methylcellulose gum 0.1-5 part;
Polyether antifoam agent GPE0.1-3 part;
Deionized water 5-30 part;
Stone chippings 2-8 part;
Wherein bag carbon stainless steel fiber one or more the Stainless Steel Fibre that to be Surface coating carbon matrix precursor be in maltose, glucose, Mierocrystalline cellulose.
2. the preparation method of conducting concrete as claimed in claim 1, is characterized in that, comprise the following steps:
A. the preparation of bag carbon stainless steel fiber: get carbon matrix precursor 20 parts, stainless steel hydrothermal reaction kettle is placed in together with 100 parts of Stainless Steel Fibres, and stir, controlling temperature of reaction is 300 DEG C, reaction times is 2h, reacted Stainless Steel Fibre centrifugation is obtained purifying bag carbon stainless steel fiber; Bag carbon stainless steel fiber through purifies and separates process is placed in stainless steel hydrothermal reaction kettle, add the vinylformic acid of reaction solution volume 1%-10% simultaneously, controlling temperature of reaction is 200 degree, reaction times is 2h, and the Stainless Steel Fibre centrifugation purifying after reaction terminates, surface being surrounded by carboxyl obtains hydrophilic bag carbon stainless steel fiber;
B. methylcellulose gum, bag carbon stainless steel fiber and deionized water are put into stirrer stirring at low speed;
C., after the solution in step b stirs and disperses, cement, silicon ash, deionized water is added, and by stirrer
Be placed in high-speed stirring state, until bag carbon stainless steel fiber, graphite etc. are dispersed in cement mortar;
D. the cement mortar that then just step c obtains pours into mould, and it is de-after 24 hours to put into standard curing room maintenance
Mould, obtains work in-process;
E. keep surface of semi-finished moistening, maintenance obtains conducting concrete finished product after extremely specifying the length of time.
3. the preparation method of conducting concrete as claimed in claim 2, is characterized in that, carbon matrix precursor in described step a
For: one or more in maltose, glucose, Mierocrystalline cellulose and chitosan.
4. the preparation method of conducting concrete as claimed in claim 2, it is characterized in that, the length of described Stainless Steel Fibre is 35mm, and diameter is 0.5mm.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105529056A (en) * | 2016-03-03 | 2016-04-27 | 左腊心 | Conductivee resistance-reducing product for reducing metal corrosion, and preparation method |
| CN113152508B (en) * | 2021-05-08 | 2022-07-15 | 河南四达电力设备股份有限公司 | Conductive concrete shell, tower concrete foundation and construction process |
| CN115385621A (en) * | 2022-07-11 | 2022-11-25 | 长安大学 | Self-induction conductive cement composite material and preparation method thereof |
| CN115140981B (en) * | 2022-07-28 | 2023-04-25 | 武汉理工大学 | High-performance graphite steel fiber concrete and preparation method thereof |
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| EP1564193A1 (en) * | 2004-02-10 | 2005-08-17 | Trefilarbed Bissen S.A. | Metal fibre reinforced sprayed concrete |
| CN1821152A (en) * | 2005-12-02 | 2006-08-23 | 大连理工大学 | Method for preparing cement base graphite steel fiber composite conductive material |
| KR100840147B1 (en) * | 2007-11-21 | 2008-06-23 | 주식회사 대유스틸 | Steel fibre for concrete reinforcing |
| CN102432239A (en) * | 2011-09-19 | 2012-05-02 | 重庆大学 | Corrosion-resistant high-strength conductive concrete and preparation method thereof |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP3083903B2 (en) * | 1992-03-17 | 2000-09-04 | 株式会社ブリヂストン | Steel fiber member for concrete reinforcement and method of manufacturing the same |
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Patent Citations (5)
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| EP0499438A1 (en) * | 1991-02-12 | 1992-08-19 | Ici Americas Inc. | Reinforced concrete system |
| EP1564193A1 (en) * | 2004-02-10 | 2005-08-17 | Trefilarbed Bissen S.A. | Metal fibre reinforced sprayed concrete |
| CN1821152A (en) * | 2005-12-02 | 2006-08-23 | 大连理工大学 | Method for preparing cement base graphite steel fiber composite conductive material |
| KR100840147B1 (en) * | 2007-11-21 | 2008-06-23 | 주식회사 대유스틸 | Steel fibre for concrete reinforcing |
| CN102432239A (en) * | 2011-09-19 | 2012-05-02 | 重庆大学 | Corrosion-resistant high-strength conductive concrete and preparation method thereof |
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