CN108409228A - A kind of single layer cement base wave-absorber and preparation method thereof for mixing nano wave-absorption agent again - Google Patents

A kind of single layer cement base wave-absorber and preparation method thereof for mixing nano wave-absorption agent again Download PDF

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Publication number
CN108409228A
CN108409228A CN201810151772.3A CN201810151772A CN108409228A CN 108409228 A CN108409228 A CN 108409228A CN 201810151772 A CN201810151772 A CN 201810151772A CN 108409228 A CN108409228 A CN 108409228A
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wave
water
single layer
absorption agent
cement base
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CN108409228B (en
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孙亚飞
孙曼婧
周天舒
高培伟
刘宏伟
陈敏
李隽�
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Yangcheng Institute of Technology
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Yangcheng Institute of Technology
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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
    • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
    • C04B28/04—Portland cements
    • 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
    • C04B2111/00008—Obtaining or using nanotechnology related materials
    • 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
    • C04B2111/00241—Physical properties of the materials not provided for elsewhere in C04B2111/00
    • C04B2111/00258—Electromagnetic wave absorbing or shielding materials
    • 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
    • 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
    • C04B2201/52—High compression strength concretes, i.e. with a compression strength higher than about 55 N/mm2, e.g. reactive powder concrete [RPC]

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
  • Building Environments (AREA)

Abstract

The invention discloses a kind of single layer cement base wave-absorbers and preparation method thereof for mixing nano wave-absorption agent again, the wave-absorber includes cement, silicon ash, water, redox graphene, nano ferriferrous oxide, nickel plating multi-walled carbon nanotube and water-reducing agent, and other components account for 5~20%, 30~40%, 0.01~0.1%, 1~3%, 0.2~1.5% and the 0.1~0.5% of cement quality respectively；Preparation method includes the following steps：Weigh material requested；Cement, silicon ash are poured into agitated kettle and stirred evenly, nano ferriferrous oxide and nickel plating multi-walled carbon nanotube are poured into agitated kettle, 2~5min of stirring at low speed after stirring evenly；The dispersion liquid mix for being subsequently added into redox graphene is uniform；Add water and water-reducing agent, blender 2~5min of stirring at low speed stops 10~30s, 2~5min of high-speed stirred, by the slurry mixed injection mold vibration molding, be placed in climatic chamber and conserve, demould afterwards for 24 hours, continue with this condition maintenance to get.Of the invention green, environmental protection, "dead", preparation process is simple, and forming is convenient, can standardized production, it is good with Integration of building.

Description

A kind of single layer cement base wave-absorber and preparation method thereof for mixing nano wave-absorption agent again
Technical field
The invention belongs to a kind of novel modified cement-based composite materials, and in particular to a kind of list for mixing nano wave-absorption agent again Layer cement base wave-absorber and preparation method thereof.
Background technology
With the important carrier that the fast development of electronics and information industry, electromagnetic wave are propagated as information, people are had penetrated into The various aspects of life.Electrical equipment will produce electromagnetic radiation when working, and with Conduction coupling and radiate coupled modes to surrounding Environmental dissemination.Currently, electromagnetic radiation has been classified as the fourth-largest pollution sources after both water, air, noise by related organization.Electromagnetism spoke Penetrate and not only reduce electronic equipment service efficiency, performance and reliability, and also reduce electronic equipment service life with Safety, meanwhile, electromagnetic radiation causes health different degrees of harm by fuel factor and non-thermal effect, solid to human body Some weak electromagnetic fields generate interference, cause gene in human body cell to morph, increase human body cases with leukemia, high blood The risk of the diseases such as pressure, cancer also will produce information-leakage to some extent and position leakage.
Electromagnetic wave is distally propagated in space without returning to wave source in the form of energy, just forms electromagnetism spoke in this way It penetrates, shielding and absorbing phenomenon is will produce when encountering wave-absorber, part energy is because of wave-absorber surface impedance and space wave impedance It mismatches and is reflected back, part energy is transmitted by wave-absorber, and is incident on electromagnetic wave part energy inside wave-absorber It is dissipated because interior of articles charged particle polarizes, because of wave-absorber scattering-in effect multipath reflection conversion occurs for part energy It is consumed for thermal energy or other forms energy.In electromagnetic wave shielding and Absorption Study method, transmission line theory method is current wide A kind of analysis method of general use, this method see shield as certain thickness homogeneous material body, are incident on its surface electromagnetism Wave is by a reflection part, and remainder penetrates into shield and propagates forward, and in communication process, electromagnetic wave will be shielded body Continuous absorption is decayed, and multiple reflections and transmission between shield internal interface, principle is as shown in Figure of description 1.
According to Xie Kenuofu (Schelkunoff) formula, total shield effectiveness SEtotal(dB)=SEA+SER+SEM, wherein SEA To absorb part efficiency, SERFor reflective portion efficiency, SEMFor material internal multiple reflections efficiency, work as SEAWhen more than 15dB, SEM It can be neglected, at this time total shield effectiveness SEtotal(dB)=SEA+SER.By Schelkunoff formula it is found that shielding cannot be from Fundamentally weaken and even be eliminated electromagnetic wave, the electromagnetic wave reflected by material surface also will produce secondary pollution, using with suction wave The energy of electromagnetic wave is converted to the energy of other forms by the material of function, can be inherently eliminated electromagenetic wave radiation.
Low-carbon, energy saving, scientific and technological environmental protection are the fundamentals of green building intension, and in future society, people are low in enjoyment While carbon is lived, it can more focus on living environment scientific and technological content and taste.Currently, although electromagnetic radiation pollution harmfulness also not It is swung to water, air, noise pollution in same level, but with the enhancing of people's environmental consciousness by people, it is believed that soon In the future, people also have and administer water, air and noise pollution are determined to administer various harm caused by electromagnetic wave.
Therefore, a kind of wave-absorber that can effectively shield with electromagnetic wave absorption is invented, the ever-increasing fine life of people is met Demand living, improves habitation environment quality, pushes the promotion energetically of green building field technology innovation and material property, effectively reduces The research of Contamination of Electromagnetic Wave this respect is with important theoretical research and actual application value and a valuable job.
Currently, cement-base composite material (such as concrete, cement mortar) has abundant resource and good environment suitable Answering property is still most widely used construction material, and cement-base composite material has high intensity, service life long, environmentally protective etc. Feature, but relative to high compressive strength, electric conductivity is poor with absorbing property, and magnetic conductivity imaginary part is smaller, and minimum value is only 0.07, the application and development in special dimension are also restricted to a certain extent, and it is to improve to mix wave absorbing agent again in cement-based material The important channel of its absorbing property.
Wave absorbing agent is divided into absorption-type and interference-type by its wave-absorbing mechanism, and absorption-type wave absorbing agent is mainly material internal electromagnetic wave Loss absorbs, and interference-type wave absorbing agent is equal using material suction wave layer surface back wave and bottom echo amplitude and opposite in phase is former Reason carries out interference counteracting, to achieve the purpose that loss and decaying electromagnetic wave.Absorption-type wave absorbing agent is divided into according to its mechanism： (1) resistor-type：Such as silicon carbide, graphite, carbon black and carbon fiber, there is higher dielectric loss factor in high band, pass through electric field Interaction changes with resistance come electromagnetic wave energy of decaying；(2) dielectric type：Such as barium titanate, silicon nitride, nitrided iron, wave machine is inhaled Reason is because it is with high dielectric constant and larger dielectric loss angle, with the electronic polarization of medium, ionic polarization, molecular polarization Or the relaxations such as interfacial polarization are come electromagnetic wave of decaying；(3) magnetic medium type, such as Ferrite Material, carbonyl iron dust, ultrafine metallic micropowder, Mechanism is to be absorbed by magnetic hystersis loss, domain wall resonance and natural resonance using the higher magnetic loss factor of magnetic material Decaying electromagnetic wave.
Based on absorbing by force, metal_based material is widely used in protecting electrical equipment far from electromagnetic shielding traditional wave absorbing agent Interference, but metal shell material is heavy, the perishable, limitation that causes it to be applied in cement-based absorption material.In order to avoid gold The shortcomings that belonging to material, metal coating polymer, ceramics, traditional carbon-based material are widely used as alternative metals material wave absorbing agent In cement-based material.Traditional carbon-based material such as graphite, modified graphite and carbon black have preferable electric conductivity and absorbing property, but It is incorporated into cement-based material, by appearance " ball effect ", it will be apparent that reduces composite materials property.
Meanwhile target of the wave absorbing agent of one-component due to being difficult to realize wideband absorption, often absorbing property is poor, Cannot meet absorbing material efficiently, the requirement of lightweight, therefore prepare and had both the nano wave-absorption agent of dielectric loss and magnetic loss As the hot spot of current absorbing material research field.
Invention content
For the deficiency of existing issue, the object of the present invention is to provide a kind of single layer cement base suctions for mixing nano wave-absorption agent again Wave body and preparation method；Dielectric type will be inhaled wave filler and be mixed again in cement-based material with magnetic medium filler by the present invention, be opened up Width absorbs the frequency range with shielding electromagnetic wave；And the wave-absorber provided is green, environmentally friendly, "dead", preparation process is simple, forming side Just, can standardized production, it is good with Integration of building.
The present invention solve its technical problem the technical solution adopted is that：
A kind of single layer cement base wave-absorber for mixing nano wave-absorption agent again, including cement, silicon ash, water, redox graphene, Nano ferriferrous oxide, nickel plating multi-walled carbon nanotube and water-reducing agent, wherein silicon ash, water, redox graphene, four oxygen of nanometer Change three-iron, nickel plating multi-walled carbon nanotube and water-reducing agent account for respectively cement quality 5~20%, 30~40%, 0.01~ 0.1%, 1~3%, 0.2~1.5% and 0.1~0.5%.
As the optimal technical scheme of the application, the cement is Portland cement, and grade is PII 42.5 Grade, SiO in silicon ash2Content>86%, specific surface area 15m2/ g, moisture content<3.0%, activity index>106%, total alkalinity ＜ 1.5%.
As the optimal technical scheme of the application, the redox graphene, thickness is 0.55~1.2nm, diameter It it is 0.5~3 μm, the number of plies is 1~5 layer.
As the optimal technical scheme of the application, the nano ferriferrous oxide average diameter is 20nm, apparent density For 0.84g/cm3, absolute density is 4.8~5.1g/cm3。
As the optimal technical scheme of the application, the nickel plating multi-walled carbon nanotube caliber is 20~30nm, and length is 10~30 μm, specific surface area ＞ 110m2/ g, bulk density 0.27g/cm3, conductivity 150s/cm.
As the optimal technical scheme of the application, the water-reducing agent is polycarboxylic acid water reducing agent, water-reducing rate 45%.
A kind of preparation method of single layer cement base wave-absorber that mixing nano wave-absorption agent again, includes the following steps：Cement is weighed, It is spare；Silicon ash is weighed in mass ratio, and the two, which is poured into agitated kettle, to stir evenly, and weighs four oxygen of nanometer after stirring evenly in mass ratio Change three-iron and nickel plating multi-walled carbon nanotube pours into agitated kettle, stirring at low speed；Then reduction is added in the mixture being stirred The dispersion liquid mix of graphene oxide is uniform；Water and water-reducing agent are finally weighed in mass ratio, are added in mixture, blender is low Speed stirring, stops 10~30s, then high-speed stirred, by the slurry mixed injection mold vibration molding, is placed in climatic chamber and supports Shield, demould afterwards for 24 hours, continue with this condition maintenance to get.
As the optimal technical scheme of the application, the stirring at low speed, high-speed stirred time be 2~5min.
As the optimal technical scheme of the application, the die size is 300 × 300 × 30mm3。
As the optimal technical scheme of the application, it is 18~22 DEG C that the climatic chamber, which keeps temperature, relative humidity ＞ 90%.
Studies have shown that nano material has skin effect, quantum size effect, small-size effect, macroscopic quantum tunneling effect Distinguished characteristic should be waited, becomes a very active hot spot in current material science research, and most promising One of wave absorbing agent.The atom dangling bonds of the large specific surface area of nano-particle in nano material, surface are more, interfacial polarization and it is multiple dissipate Penetrating becomes important mechanism.
Carbon nanotube (CNTs) is the seamless hollow pipe being rolled by graphene sheet layer, with excellent mechanical property, electrically Energy, hot property, hydrogen storage property and field emission performance can obtain having specific by different preparation methods and function of surface modification The carbon nanotube of performance meets the needs of space flight, electronics, chemical industry and biomedicine field.Nickel plating multi-walled carbon nanotube (Ni/ MWCNTs) have excellent property heat resistance, corrosion resistance, impact resistance and excellent electric conductivity, biological compatibility, wave absorbtion The interest that domestic and international many scholars can also be caused, has extremely wide application prospect.
Two-dimentional redox graphene (rGO) is the intermediate product that graphite oxidation prepares graphene, and it is excellent to have graphene Good intrinsic property, there are a large amount of active groups in structure such as：Hydroxyl (- OH), carboxyl (- COOH) and epoxy group (- O-), The introducing of these active groups makes graphite flake layer spacing increase, and makes its surface adhesion metal particle or inorganic non-metallic particle shape It is possibly realized at intercalated compound, meanwhile, there is hydrophily, be easily dispersed and prepare nano dispersion fluid.
It is provided by the invention to mix nano wave-absorption agent one way cement base wave-absorber and preparation method thereof again, with prior art phase Than having the advantages that：
(1) present invention is for the first time by rGO, Ni/MWCNTs and nano-Fe3O4It mixes in cement mortar again, dielectric type is inhaled into wave Filler is mixed with magnetic medium filler in cement-based material again, frequency be 2-18GHz within the scope of realize inhale wave reflection rate less than- 5dB, resistance to compression in 7 days, flexural strength be not less than 54.8MPa, 6.6MPa, resistance to compression in 28 days, flexural strength not less than 71.3MPa, 9.3MPa；
(2) single layer cement base wave-absorber of the invention is green, environmentally friendly, "dead", and preparation process is simple, and forming is convenient, Can standardized production, it is good with Integration of building.
Description of the drawings
Fig. 1 is to absorb and shielding electromagnetic wave principle figure；
Fig. 2 is the reflectance test figure of 2 sample of embodiment 1 and embodiment；
Wherein, 1# is the reflectance test value of 1 sample of embodiment；2# is the reflectance test value of 2 sample of embodiment.
Specific implementation mode
The present invention is described in further details with reference to embodiments.Particular technique or condition are not specified in embodiment Person carries out according to technology described in document in the art or according to product description；Agents useful for same or instrument and equipment are not Production firm is indicated, the conventional products that can be bought by market are accordingly to be regarded as.Wave-absorber sample size be 300 × 300 × 30mm3, suction wave reflection rate test sample size is 180 × 180 × 30mm3。
Embodiment 1：
A kind of single layer cement base wave-absorber for mixing nano wave-absorption agent again, including cement, silicon ash, water, redox graphene, Nano ferriferrous oxide, nickel plating multi-walled carbon nanotube and water-reducing agent, wherein silicon ash, water, redox graphene, four oxygen of nanometer Change 10%, 34%, 0.03%, 2%, 0.5% and that three-iron, nickel plating multi-walled carbon nanotube and water-reducing agent account for cement quality respectively 0.33%.
The preparation method of the above-mentioned single layer cement base wave-absorber for mixing nano wave-absorption agent again, includes the following steps：Weigh cement It is spare, with cement quality for 1,10% silicon ash is weighed according to mass ratio, the two, which is poured into agitated kettle, to stir evenly, and stirs evenly Afterwards, 2% nano ferriferrous oxide and 0.5% nickel plating multi-walled carbon nanotube, stirring at low speed 2.5min are weighed；Then it is being stirred Mixture in be added 0.03% redox graphene dispersion liquid (ultrasonic disperse) mix it is uniform；Finally weigh 34% water and 0.33% water-reducing agent, is added in mixture, blender stirring at low speed 2.5min, stops 20s, and high-speed stirred 2.5min will be mixed Slurry inject 300 × 300 × 30mm3Mold vibration is molded, and is placed in climatic chamber, and it is 18~22 DEG C to keep temperature, Relative humidity ＞ 90%, demoulding continues to continue to conserve 7d, 28d with this condition afterwards for 24 hours, continues to support in the natural environment after 28d Shield, it is spare.
By cement base wave-absorber prepared by embodiment 1,7d resistance to compressions, flexural strength respectively reach 63.3MPa, 8.2MPa, 28d Resistance to compression, flexural strength respectively reach 84.2MPa, 10.9MPa, and as shown in the 1# in Fig. 2, minimum reflectance appears in frequency and is 2.22GHz reaches -9.8dB, in 2-18GHz frequency ranges, is less than -5dB effective bandwidths and reaches 16GHz.
Embodiment 2：
A kind of single layer cement base wave-absorber for mixing nano wave-absorption agent again, including cement, silicon ash, water, redox graphene, Nano ferriferrous oxide, nickel plating multi-walled carbon nanotube and water-reducing agent, wherein silicon ash, water, redox graphene, four oxygen of nanometer Change 10%, 37%, 0.03%, 2%, 1% and that three-iron, nickel plating multi-walled carbon nanotube and water-reducing agent account for cement quality respectively 0.36%.
The preparation method of the above-mentioned single layer cement base wave-absorber for mixing nano wave-absorption agent again, includes the following steps：Weigh cement It is spare, with cement quality for 1,10% silicon ash is weighed according to mass ratio, the two, which is poured into agitated kettle, to stir evenly, and stirs evenly Afterwards, 2% nano ferriferrous oxide and 1% nickel plating multi-walled carbon nanotube, stirring at low speed 2.5min are weighed；Then it is being stirred Redox graphene dispersion liquid (ultrasonic disperse) mix of addition 0.03% is uniform in mixture；Finally weigh 37% water and 0.36% water-reducing agent, is added in mixture, blender stirring at low speed 2.5min, stops 20s, and high-speed stirred 2.5min will be mixed Slurry inject 300 × 300 × 30mm3Mold vibration is molded, and is placed in climatic chamber, and it is 18~22 DEG C to keep temperature, Relative humidity ＞ 90%, demoulding continues to continue to conserve 7d, 28d with this condition afterwards for 24 hours, continues to support in the natural environment after 28d Shield, it is spare.
By cement base wave-absorber prepared by embodiment 2,7d resistance to compressions, flexural strength respectively reach 65.5MPa, 9.1MPa, 28d Resistance to compression, flexural strength respectively reach 84.6MPa, 11.2MPa, and as shown in the 2# in Fig. 2, minimum reflectance appears in frequency and is 3.16GHz reaches -10.6dB, in 2-18GHz frequency ranges, is less than -5dB effective bandwidths and reaches 16GHz.
Answering for the present invention mixes the single layer cement base wave-absorber of nano wave-absorption agent and exists it can be seen from embodiment 1 and embodiment 2 In 2-18GHz frequency ranges, the target of wideband electromagnetic wave absorption is realized, the effective bandwidth less than -5dB reaches 16GHz, can be extensively Important civil buildings are applicable in absorb with general military installations and shield electromagnetic wave field.
Embodiment 3：
A kind of single layer cement base wave-absorber for mixing nano wave-absorption agent again, including cement, silicon ash, water, redox graphene, Nano ferriferrous oxide, nickel plating multi-walled carbon nanotube and water-reducing agent, wherein silicon ash, water, redox graphene, four oxygen of nanometer Change three-iron, nickel plating multi-walled carbon nanotube and water-reducing agent and accounts for 10%, 33%, 0.015%, 2%, the 0.5% of cement quality respectively With 0.31%.
The preparation method of the above-mentioned single layer cement base wave-absorber for mixing nano wave-absorption agent again, includes the following steps：Weigh cement It is spare, with cement quality for 1,10% silicon ash is weighed according to mass ratio, the two, which is poured into agitated kettle, to stir evenly, and stirs evenly Afterwards, 2% nano ferriferrous oxide and 0.5% nickel plating multi-walled carbon nanotube, stirring at low speed 2.5min are weighed；Then it is being stirred Mixture in be added 0.015% redox graphene dispersion liquid (ultrasonic disperse) mix it is uniform；Finally weigh 33% water And 0.31% water-reducing agent, it is added in mixture, blender stirring at low speed 2.5min stops 20s, and high-speed stirred 2.5min will be mixed Good slurry injects 300 × 300 × 30mm3Mold vibration is molded, and is placed in climatic chamber, and it is 18~22 to keep temperature DEG C, relative humidity ＞ 90%, demoulding continues to continue to conserve 7d, 28d with this condition afterwards for 24 hours, continues in the natural environment after 28d Maintenance, it is spare.
By cement base wave-absorber prepared by embodiment 3,7d resistance to compressions, flexural strength respectively reach 54.8MPa, 6.6MPa, 28d Resistance to compression, flexural strength respectively reach 71.3MPa, 9.3MPa.
Embodiment 4：
A kind of single layer cement base wave-absorber for mixing nano wave-absorption agent again, including cement, silicon ash, water, redox graphene, Nano ferriferrous oxide, nickel plating multi-walled carbon nanotube and water-reducing agent, wherein silicon ash, water, redox graphene, four oxygen of nanometer Change three-iron, nickel plating multi-walled carbon nanotube and water-reducing agent and accounts for 10%, 36%, 0.045%, 2%, the 0.5% of cement quality respectively With 0.36%.
The preparation method of the above-mentioned single layer cement base wave-absorber for mixing nano wave-absorption agent again, includes the following steps：Weigh cement It is spare, with cement quality for 1,10% silicon ash is weighed according to mass ratio, the two, which is poured into agitated kettle, to stir evenly, and stirs evenly Afterwards, 2% nano ferriferrous oxide and 0.5% nickel plating multi-walled carbon nanotube, stirring at low speed 2.5min are weighed；Then it is being stirred Mixture in be added 0.045% redox graphene dispersion liquid (ultrasonic disperse) mix it is uniform；Finally weigh 36% water And 0.36% water-reducing agent, it is added in mixture, blender stirring at low speed 2.5min stops 20s, and high-speed stirred 2.5min will be mixed Good slurry injects 300 × 300 × 30mm3Mold vibration is molded, and is placed in climatic chamber, and it is 18~22 to keep temperature DEG C, relative humidity ＞ 90%, demoulding continues to continue to conserve 7d, 28d with this condition afterwards for 24 hours, continues in the natural environment after 28d Maintenance, it is spare.
By cement base wave-absorber prepared by embodiment 4,7d resistance to compressions, flexural strength respectively reach 73.9MPa, 9.9MPa, 28d Resistance to compression, flexural strength respectively reach 98.7MPa, 12.1MPa.
Embodiment 5：
A kind of single layer cement base wave-absorber for mixing nano wave-absorption agent again, including cement, silicon ash, water, redox graphene, Nano ferriferrous oxide, nickel plating multi-walled carbon nanotube and water-reducing agent, wherein silicon ash, water, redox graphene, four oxygen of nanometer Change 5%, 30%, 0.01%, 1%, 0.2% and that three-iron, nickel plating multi-walled carbon nanotube and water-reducing agent account for cement quality respectively 0.3%.
The preparation method of the above-mentioned single layer cement base wave-absorber for mixing nano wave-absorption agent again, includes the following steps：Weigh cement It is spare, with cement quality for 1,5% silicon ash is weighed according to mass ratio, the two, which is poured into agitated kettle, to stir evenly, after stirring evenly, Weigh 1% nano ferriferrous oxide and 0.2% nickel plating multi-walled carbon nanotube, stirring at low speed 2min；Then mixed what is be stirred Redox graphene dispersion liquid (ultrasonic disperse) mix for closing addition 0.01% in object is uniform；Finally weigh 30% water and 0.3% water-reducing agent, is added in mixture, and blender stirring at low speed 2min stops 10s, high-speed stirred 2min, the slurry that will have been mixed Inject 300 × 300 × 30mm3Mold vibration is molded, and is placed in climatic chamber, and it is 18~22 DEG C to keep temperature, relatively wet ＞ 90% is spent, demoulding continues to continue to conserve 7d, 28d with this condition afterwards for 24 hours, continues to conserve in the natural environment after 28d, standby With.
Embodiment 6：
A kind of single layer cement base wave-absorber for mixing nano wave-absorption agent again, including cement, silicon ash, water, redox graphene, Nano ferriferrous oxide, nickel plating multi-walled carbon nanotube and water-reducing agent, wherein silicon ash, water, redox graphene, four oxygen of nanometer Change 20%, 40%, 0.1%, 3%, 1.25% and that three-iron, nickel plating multi-walled carbon nanotube and water-reducing agent account for cement quality respectively 0.35%.
The preparation method of the above-mentioned single layer cement base wave-absorber for mixing nano wave-absorption agent again, includes the following steps：Weigh cement It is spare, with cement quality for 1,20% silicon ash is weighed according to mass ratio, the two, which is poured into agitated kettle, to stir evenly, and stirs evenly Afterwards, 3% nano ferriferrous oxide and 1.25% nickel plating multi-walled carbon nanotube, stirring at low speed 5min are weighed；Then it is being stirred Mixture in be added 0.1% redox graphene dispersion liquid (ultrasonic disperse) mix it is uniform；Finally weigh 40% water and 0.35% water-reducing agent, is added in mixture, and blender stirring at low speed 5min stops 30s, high-speed stirred 5min, the slurry that will have been mixed 300 × 300 × 30mm of material injection3Mold vibration is molded, and is placed in climatic chamber, and it is 18~22 DEG C to keep temperature, relatively Humidity ＞ 90%, demoulding continues to continue to conserve 7d, 28d with this condition afterwards for 24 hours, continues to conserve in the natural environment after 28d, standby With.
By embodiment it is found that by rGO, Ni/MWCNTs and nano-Fe3O4Its dosage is mixed in cement mortar and adjusted again, Frequency be 2-18GHz in realize inhale wave reflection rate be less than -5dB, resistance to compression in 7 days, flexural strength be not less than 54.8MPa, 6.6MPa, resistance to compression in 28 days, flexural strength are not less than 71.3MPa, 9.3MPa, can be widely used in important civil buildings with it is general Military installations absorb and shielding electromagnetic wave field.
The protection content of the present invention is not limited to above example.Without departing from the spirit and scope of the invention, originally Field technology personnel it is conceivable that variation and advantage be all included in the present invention, and with the attached claims be protection Range.

Claims (10)

1. a kind of single layer cement base wave-absorber for mixing nano wave-absorption agent again, which is characterized in that including cement, silicon ash, water, oxygen reduction Graphite alkene, nano ferriferrous oxide, nickel plating multi-walled carbon nanotube and water-reducing agent, wherein silicon ash, water, redox graphene, Nano ferriferrous oxide, nickel plating multi-walled carbon nanotube and water-reducing agent account for respectively cement quality 5~20%, 30~40%, 0.01~0.1%, 1~3%, 0.2~1.5% and 0.1~0.5%.
2. the single layer cement base wave-absorber according to claim 1 for mixing nano wave-absorption agent again, which is characterized in that the water Mud is Portland cement, and grade is 42.5 grades of PII, SiO in silicon ash2Content>86%, specific surface area 15m2/ g, contains Water rate<3.0%, activity index>106%, total alkalinity ＜ 1.5%.
3. the single layer cement base wave-absorber according to claim 1 for mixing nano wave-absorption agent again, which is characterized in that described goes back Former graphene oxide, thickness are 0.55~1.2nm, and a diameter of 0.5~3 μm, the number of plies is 1~5 layer.
4. the single layer cement base wave-absorber according to claim 1 for mixing nano wave-absorption agent again, which is characterized in that described receives Rice ferroso-ferric oxide average diameter is 20nm, apparent density 0.84g/cm3, absolute density is 4.8~5.1g/cm3。
5. the single layer cement base wave-absorber according to claim 1 for mixing nano wave-absorption agent again, which is characterized in that the plating Nickel multi-walled carbon nanotube caliber is 20~30nm, and length is 10~30 μm, specific surface area ＞ 110m2/ g, bulk density are 0.27g/cm3, conductivity 150s/cm.
6. the single layer cement base wave-absorber according to claim 1 for mixing nano wave-absorption agent again, which is characterized in that described subtracts Aqua is polycarboxylic acid water reducing agent, water-reducing rate 45%.
7. a kind of preparation method of single layer cement base wave-absorber as described in claim 1 that mixing nano wave-absorption agent again, feature It is, includes the following steps：Cement is weighed, it is spare；Silicon ash is weighed in mass ratio, and the two, which is poured into agitated kettle, to stir evenly, and stirs Nano ferriferrous oxide is weighed in mass ratio after mixing uniformly and nickel plating multi-walled carbon nanotube pours into agitated kettle, stirring at low speed；Then The dispersion liquid mix that redox graphene is added in the mixture being stirred is uniform；Finally water is weighed in mass ratio and is subtracted Aqua is added in mixture, and blender stirring at low speed stops 10~30s, then high-speed stirred, and the slurry mixed is injected mold Vibration moulding is placed in climatic chamber and conserves, and demoulds afterwards for 24 hours, continue with this condition maintenance to get.
8. the preparation method of the single layer cement base wave-absorber according to claim 7 for mixing nano wave-absorption agent again, feature exist It is 2~5min in the time of, the stirring at low speed, high-speed stirred.
9. the preparation method of the single layer cement base wave-absorber according to claim 7 for mixing nano wave-absorption agent again, feature exist In the die size is 300 × 300 × 30mm3。
10. the preparation method of the single layer cement base wave-absorber according to claim 7 for mixing nano wave-absorption agent again, feature exist In it is 18~22 DEG C that the climatic chamber, which keeps temperature, relative humidity ＞ 90%.
CN201810151772.3A 2018-02-14 2018-02-14 Single-layer cement-based wave absorber doped with nano wave absorber and preparation method thereof Expired - Fee Related CN108409228B (en)

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