CN104628421B - Wavefront modifier technology is inhaled on the surface of a kind of cement and concrete - Google Patents
Wavefront modifier technology is inhaled on the surface of a kind of cement and concrete Download PDFInfo
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- CN104628421B CN104628421B CN201510040492.1A CN201510040492A CN104628421B CN 104628421 B CN104628421 B CN 104628421B CN 201510040492 A CN201510040492 A CN 201510040492A CN 104628421 B CN104628421 B CN 104628421B
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Abstract
The present invention provides the surface of a kind of cement and concrete to inhale wavefront modifier technology, and concrete technical scheme is as follows: under the effect of externally-applied magnetic field, makes magnetic material penetrate in type cement and concrete, forms the top layer with absorbing property；Described magnetic material is MFe2O4Nano particle, M is Fe, Co, Mn or Ni element.The magnetic material MFe used in the present invention2O4, for water miscible nano particle, size is little, relatively high magnetism, can effectively, sufficiently enter into cement and concrete surface and inside；The inventive method can carry out surface modification in type cement, concrete material or existing building so that it is forms the top layer with absorbing property, and process is simple, low in raw material price, productivity are high, be suitable for a large amount of production and application.
Description
Technical field
The invention belongs to cement and technical field of concrete, wavefront modifier skill is inhaled on the surface relating to a kind of cement and concrete
Art, is specifically related to a kind of skill by making it have absorbing property in type cement or concrete surface infiltration magnetic material
Art.
Background technology
With the development of modern science and technology, the impact of environment is increasingly paid close attention to by electromagenetic wave radiation by people.According to people
Investigation learn that electromagnetic radiation intensity that modern accepts every day is than the electromagnetism from nature accepted before the centuries
Radiating high 200,000,000 times, UNCHE will prevent electromagnetic radiation pollution to be classified as one of environmental protection project.Therefore,
Administering electromagnetic pollution, inhaling wave building material has become a big research topic of material science.
Having the research of some application technologies at present both at home and abroad, the patent such as application number 200610098349.9 discloses one
Wave absorbing cement concrete material and preparation method thereof, the cement concrete prepared by the method contains inorganic absorbent, and distribution
There is bubble.This concrete absorbing material be joined in cement by scattered absorbent stir, add cement, concrete speed
The steps such as solidifying agent, moulding, the demoulding are prepared from.The patent of application number 201210157229.7 discloses a kind of suction ripple foam coagulation
Soil and preparation method thereof, including by cement, physical blowing agent, wave absorbing agent, high-efficiency water-reducing agent of poly-carboxylic acid and the step of water mixing, is somebody's turn to do
Wave-absorbing foam concrete by wave absorbing agent by inner blending method through premixing, mix, add foam stirring, moulding by casting, maintenance after prepared.Shen
Please number 201210119127.6 pumecretes with electromagnetic wave absorption function and preparation method thereof, using float stone as coarse aggregate
With carbon black as the pumecrete of absorbent.
But prior art is all incorporation absorbing material during cement, concrete-agitating, shaping, to make to become
Type cement, concrete material or some existing building have the performance inhaling ripple, and said method all cannot realize.If surface can be passed through
The mode processed, sufficiently enters into absorbing material cement, the top layer of concrete and inside, makes molded material have suction ripple
Performance will be then important technological break-through.
Summary of the invention
Present invention aim at: for deficiencies of the prior art, propose the surface of a kind of cement and concrete
Inhale wavefront modifier technology, penetrate into magnetic material by external magnetic field driving force in type cement and concrete surface and make it have
Absorbing property, and the size of this magnetic material is little, relatively high magnetism, is conducive to effectively, enters sufficiently into the surface of cement, concrete
And it is internal.
Wavefront modifier technology is inhaled on the surface of a kind of cement of the present invention and concrete, and concrete technical scheme is as follows:
Under the effect of externally-applied magnetic field, make magnetic material penetrate in type cement and concrete, formed and there is suction
The top layer of ripple performance；
Described magnetic material is MFe2O4Nano particle, M is Fe, Co, Mn or Ni element.
Described MFe2O4Nanoparticle size range is 6-38nm.
Wavefront modifier technology is inhaled on the surface of above-mentioned cement and concrete, and its step includes:
(1) MFe is prepared2O4Nano particle, by MFe2O4Nano particle is distributed in water, and tune PH is 6.5-7.5, obtains dense
Degree is the uniform MFe of 0.05-0.2mol/L2O4Aqueous dispersions.
(2) under the effect of externally-applied magnetic field, the aqueous dispersions that step (1) obtains is scattered in cement or concrete surface,
Make MFe2O4Nano particle penetrates into cement or concrete surface and inside, forms the top layer with absorbing property.
Described MFe2O4Nanometer grain preparation method is coprecipitation method, particularly as follows: molysite and ferrous salt, cobalt salt, manganese salt
Or the aqueous solution of nickel salt, molysite is 2:1 with the mol ratio of ferrous salt, cobalt salt, manganese salt or nickel salt, at the alkaline bar that PH is 9-10.5
React under part, stir 10min-15h at 15-180 DEG C and form magnetic nanoparticle, i.e. MFe2O4Nano particle.
Above-mentioned coprecipitation method prepare containing MFe2O4The dispersion liquid of nano particle can be used directly, and is preferably divided by magnetic field
Separate out MFe2O4Nano particle, after washing 3 times with water, is dispersed again in water or ethanol using.
In step (2), dispersing mode is spraying, brushes or impregnate.
The applying mode of externally-applied magnetic field is magnet or electromagnetic field.
Structure according to cement, concrete is different, and it is 1 μm-2 mm that magnetic material enters the thickness on surface.Magnetic material by
In the less aperture that can well be distributed in 15 nm-10 μm of size.
Wavefront modifier technology is inhaled on the surface of cement of the present invention and concrete, and relative to prior art, it has the beneficial effect that this
The magnetic material MFe used in bright2O4(M=Fe, Co, Mn, Ni), for water miscible nano particle, size is little, and magnetic is relatively
By force, cement and concrete surface and inside can effectively, be sufficiently entered into；The inventive method can be in type cement, coagulation
Soil material or existing building carry out surface modification so that it is forming the top layer with absorbing property, process is simple, cost of material is low
Honest and clean, productivity is high, be suitable for a large amount of production and application.
Accompanying drawing explanation
Fig. 1 a, b are respectively the untreated clean slurry test block low frequency of embodiment 1 and the reflectivity of high frequency.
Fig. 2 a, b are respectively clean slurry test block low frequency and the reflectivity of high frequency after embodiment 1 nano particle processes.
Detailed description of the invention
Below by embodiment, the present invention will be further elaborated, and the description below is only for explaining the present invention, not
Its content is defined.
Embodiment 1
Prepare 0.5 mol/L and the FeCl of 0.25 mol/L respectively3And FeCl2The aqueous solution, the ratio with 1:1 is molten by two kinds
Liquid is uniformly mixed, and is adjusted to pH=9 with ammoniacal liquor, is adjusted to pH=7, ultrasonic disperse, prepares at 15 DEG C after stirring 1 hour
0.1mol/LFe3O4Uniform water dissipate liquid；The aqueous dispersions under magnetic field is as driving force, this being contained nano particle is sprayed on
In cement paste test block, after tested, Fig. 1 a, b are respectively untreated clean slurry low frequency and the reflectivity of high frequency.Fig. 2 a, b are respectively and use
Magnetic nanoparticle is clean slurry low frequency and the reflectivity of high frequency after processing.Cement paste test block after process is can be seen that by contrast
Reflectivity has significantly reduction, illustrates have good absorbing property.
Embodiment 2
Prepare the FeCl of 1mol/L and 0.5mol/L respectively3And FeCl2Two kinds of solution are stirred by the aqueous solution with the ratio of 1:1
Mix, be adjusted to pH=10 with ammoniacal liquor, after 20 DEG C are stirred 1.5 hours, by magnetic field, nano particle is separated, wash 3 with water
Secondary, it is dispersed in water, by pH furnishing 7, prepares 0.1mol/L Fe3O4Uniform water dissipate liquid；Will under magnetic field is as driving force
This aqueous dispersions containing nano particle is sprayed on mortar specimen, and after tested, mortar specimen has absorbing property.
Embodiment 3
Prepare the FeCl of 0.5mol/L and 0.25mol/L respectively3And FeSO4The aqueous solution, with the ratio of 1:1 by two kinds of solution
It is uniformly mixed, is adjusted to pH=9 with ammoniacal liquor, after 30 DEG C are stirred 1 hour, by magnetic field, nano particle is separated, wash 3 with water
Secondary, it is dispersed in water, by pH furnishing 7, prepares 0.08mol/L Fe3O4Uniform water dissipate liquid；Will under magnetic field is as driving force
This contains the aqueous dispersions brushing of nano particle on concrete test block, and after tested, concrete test block has absorbing property.
Embodiment 4
Prepare the FeCl of 1mol/L and 0.5mol/L respectively3And MnSO4Two kinds of solution are stirred by the aqueous solution with the ratio of 1:1
Mix, be adjusted to pH=9 with ammoniacal liquor, after stirring 1.5 hours at 150 DEG C, by magnetic field, nano particle is separated, wash 3 with water
Secondary, it is dispersed in water, by pH furnishing 6.8, prepares 0.18mol/L MnFe2O4Uniform water dissipate liquid；In magnetic field as driving force
Lower this containing the aqueous dispersions brushing of nano particle on concrete test block, after tested, concrete test block has absorbing property.
Embodiment 5
Prepare the FeCl of 1mol/L and 0.5mol/L respectively3And CoCl2Two kinds of solution are stirred by the aqueous solution with the ratio of 1:1
Mix, be adjusted to pH=10 with ammoniacal liquor, after stirring 1.5 hours at 130 DEG C, by magnetic field, nano particle is separated, wash with water
3 times, it is dispersed in water, by pH furnishing 7.2, prepares 0.07mol/L CoFe2O4 Uniform water dissipate liquid；In magnetic field as driving
This containing the solution brushing of nano particle under power on concrete test block, after tested, concrete test block has absorbing property.
Embodiment 6
Prepare 1 mol/L and the FeCl of 0.5 mol/L respectively3With Ni (Ac)2·4H2The O aqueous solution, with the ratio of 1:1 by two
Plant solution to be uniformly mixed, by the NaOH solution of 2M, be adjusted to pH=9.5, after stirring 1.5 hours at 160 DEG C, will by magnetic field
Nano particle separates, and washes with water 3 times, is dispersed in water, and by pH furnishing 6.7, prepares 0.15 mol/L NiFe2O4Uniform
Aqueous dispersions；Under magnetic field is as driving force, concrete test block is immersed in this solution containing nano particle, after tested, mixed
The test block of solidifying soil has absorbing property.
Embodiment 7
Prepare the Fe (NO of 1mol/L and 0.5 mol/L respectively3)3·6H2O and FeCl2The aqueous solution, with the ratio of 1:1 by two
Plant solution to be uniformly mixed, be adjusted to pH=10 with ammoniacal liquor, after stirring 1.5 hours at 50 DEG C, by magnetic field, nano particle is divided
From, wash with water 3 times, be dispersed in water, by pH furnishing 7, prepare 0.09 mol/L Fe3O4Uniform water dissipate liquid；In magnetic field
As this containing the solution spraying of nano particle under driving force on concrete test block, after tested, concrete test block has suction
Ripple performance.
Embodiment 8
Prepare the Fe (NO of 0.5mol/L and 0.25 mol/L respectively3)3·6H2O and Co (Ac)2·4H2The O aqueous solution, with 1:1
Ratio two kinds of solution are uniformly mixed, be adjusted to pH=10.5 with ammoniacal liquor, stir after 1.5 hours at 120 DEG C, pass through magnetic field
Nano particle is separated, washes with water 3 times, be dispersed in water, by pH furnishing 7, prepare 0.15 mol/L CoFe2O4Uniform water
Dispersion liquid；This is contained the solution spraying of nano particle under magnetic field is as driving force on concrete test block, after tested, coagulation
Soil test block has absorbing property.
Comparative example 1
Prepare 0.5 mol/L and the FeCl of 0.25 mol/L respectively3And FeCl2The aqueous solution, the ratio with 1:1 is molten by two kinds
Liquid is uniformly mixed, and is adjusted to pH=9 with ammoniacal liquor, after stirring 1 hour, is separated by nano particle by magnetic field, washes with water under room temperature
Wash 3 times, be dispersed in water, prepare 0.1 mol/LFe3O4Uniform water dissipate liquid；Under magnetic field is as driving force, this is contained and receive
The solution spraying of rice grain is in cement paste test block, and after a period of time, after tested, the reflectivity of cement paste test block is the highest
Test block in embodiment 1, is not transferred to 7 by pH, and nano particle dispersiveness is poor, is unfavorable for the raising of absorbing property.
Comparative example 2
Under magnetic field is as driving force, by the Fe of a size of 1-3 μm3O4The aqueous solution of particle is sprayed on concrete test block,
After a period of time, after tested, the Fe that prepared by the luminance factor coprecipitation of the concrete test block after process3O4Nano particle processes
Clean slurry want height, illustrate that it is not so good as Fe prepared by coprecipitation3O4The absorbing property of the clean slurry that nano particle processes.
Comparative example 3
36g micron order carbonyl iron dust and 36g nano carbon black are mixed with 1368g sulphate aluminium cement, stir,
Obtain material I；16g animal/vegetable protein foaming agent is mixed with 112g water, system bubble 3min, obtain foam；By material I, polycarboxylic acids is high
Effect water reducer and the mixing of 608g water, stir, obtain slurry；Foam is added slurry mixing, stirs, obtain material II；
Material II injects mould, and shake is flat, obtains test block, after tested, and Fe prepared by its luminance factor coprecipitation3O4Nano particle processes
Clean slurry want height, illustrate that it is not so good as Fe prepared by coprecipitation3O4The absorbing property of the clean slurry that nano particle processes.
The embodiment of the present invention and comparative example, be applied to test block, tests under 6～18GHz, 20～40GHz two wave bands,
Test block concrete absorbing property test result is shown in Table 1.
Table 1 absorbing property test result
Claims (9)
1. wavefront modifier method is inhaled on the surface of a cement and concrete, it is characterised in that method is: in the effect of externally-applied magnetic field
Under, make magnetic material penetrate in type cement and concrete, form the top layer with absorbing property；Described magnetic material
Material is MFe2O4Nano particle, M is Fe, Co, Mn or Ni element；
Described MFe2O4Nanometer grain preparation method is coprecipitation method, particularly as follows: molysite and ferrous salt, cobalt salt, manganese salt or nickel
The aqueous solution of salt, molysite is 2:1 with the mol ratio of ferrous salt, cobalt salt, manganese salt or nickel salt, under the conditions of the alkalescence that PH is 9-10.5
Reaction, stirs 10min-15h and forms magnetic nanoparticle, i.e. MFe at 15-180 DEG C2O4Nano particle.
Wavefront modifier method is inhaled on the surface of cement the most according to claim 1 and concrete, it is characterised in that described
MFe2O4Nanoparticle size range is 6-38nm.
Wavefront modifier method is inhaled on the surface of cement the most according to claim 1 and concrete, it is characterised in that step includes:
(1) MFe is prepared2O4Nano particle, by MFe2O4Nano particle is distributed in water, and tune PH is 6.5-7.5, obtains concentration and is
The uniform MFe of 0.05-0.2mol/L2O4Aqueous dispersions；
(2) under the effect of externally-applied magnetic field, the aqueous dispersions that step (1) obtains is scattered in cement or concrete surface, makes
MFe2O4Nano particle penetrates into cement or concrete surface and inside, forms the top layer with absorbing property.
Wavefront modifier method is inhaled on the surface of cement the most according to claim 1 and concrete, it is characterised in that: above-mentioned co-precipitation
Method prepare containing MFe2O4The dispersion liquid of nano particle can be used directly.
Wavefront modifier method is inhaled on the surface of cement the most according to claim 1 and concrete, it is characterised in that: above-mentioned co-precipitation
Method prepare containing MFe2O4The dispersion liquid of nano particle, isolates MFe by magnetic field2O4Nano particle, after washing 3 times with water,
It is dispersed again in water or ethanol using.
Wavefront modifier method is inhaled on the surface of cement the most according to claim 3 and concrete, it is characterised in that: in step (2),
Dispersing mode is spraying, brushes or impregnate.
Wavefront modifier method is inhaled on the surface of cement the most according to claim 3 and concrete, it is characterised in that: in step (2),
The applying mode of externally-applied magnetic field is magnet or electromagnetic field.
Wavefront modifier method is inhaled on the surface of cement the most according to claim 1 and concrete, it is characterised in that: according to cement,
The structure of concrete is different, and it is 1 μm-2 mm that magnetic material enters the thickness on surface.
Wavefront modifier method is inhaled on the surface of cement the most according to claim 1 and concrete, it is characterised in that: magnetic material can
It is distributed in the aperture of 15 nm-10 μm.
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| CN106747656B (en) * | 2016-12-15 | 2019-04-23 | 济南大学 | A kind of preparation method of cement-based material surface wave absorbing agent and the cement-based material with absorbing property |
| CN114907076A (en) * | 2022-06-06 | 2022-08-16 | 中国人民解放军空军工程大学 | Method for synergistically improving dynamic property and wave absorption property of concrete by using nano particles |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1974468A (en) * | 2006-12-12 | 2007-06-06 | 南京南大波平电子信息有限公司 | Wave absorbing cement concrete material and its prepn process |
| CN101186474A (en) * | 2007-12-07 | 2008-05-28 | 东华理工大学 | Cement-based composite wave-absorbing material doped with nano titanium oxide and preparation method thereof |
| CN102627436A (en) * | 2012-04-20 | 2012-08-08 | 大连理工大学 | Pumice concrete with the function of electromagnetic wave absorption, and preparation method thereof |
| CN102731042A (en) * | 2012-06-26 | 2012-10-17 | 大连理工大学 | Cement mortar board used for absorbing electromagnetic wave |
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| JP2001302318A (en) * | 2000-04-14 | 2001-10-31 | Koji Otsuka | Magnetic concrete |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1974468A (en) * | 2006-12-12 | 2007-06-06 | 南京南大波平电子信息有限公司 | Wave absorbing cement concrete material and its prepn process |
| CN101186474A (en) * | 2007-12-07 | 2008-05-28 | 东华理工大学 | Cement-based composite wave-absorbing material doped with nano titanium oxide and preparation method thereof |
| CN102627436A (en) * | 2012-04-20 | 2012-08-08 | 大连理工大学 | Pumice concrete with the function of electromagnetic wave absorption, and preparation method thereof |
| CN102731042A (en) * | 2012-06-26 | 2012-10-17 | 大连理工大学 | Cement mortar board used for absorbing electromagnetic wave |
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