CN111825380A - Three-layer structure cement-based wave-absorbing plate doped with nano functional material and preparation method thereof - Google Patents
Three-layer structure cement-based wave-absorbing plate doped with nano functional material and preparation method thereof Download PDFInfo
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- 239000004568 cement Substances 0.000 title claims abstract description 67
- 239000000463 material Substances 0.000 title claims abstract description 15
- 238000002360 preparation method Methods 0.000 title claims abstract description 11
- 238000010521 absorption reaction Methods 0.000 claims abstract description 58
- 239000008204 material by function Substances 0.000 claims abstract description 7
- 238000003756 stirring Methods 0.000 claims description 54
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 37
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 22
- 239000004917 carbon fiber Substances 0.000 claims description 22
- 229910021487 silica fume Inorganic materials 0.000 claims description 21
- 239000003638 chemical reducing agent Substances 0.000 claims description 20
- 229910052581 Si3N4 Inorganic materials 0.000 claims description 15
- 239000006229 carbon black Substances 0.000 claims description 13
- 239000002245 particle Substances 0.000 claims description 11
- 239000000203 mixture Substances 0.000 claims description 10
- 239000002002 slurry Substances 0.000 claims description 10
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 9
- 239000006185 dispersion Substances 0.000 claims description 9
- 239000007788 liquid Substances 0.000 claims description 9
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 8
- 229910021389 graphene Inorganic materials 0.000 claims description 8
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 8
- 239000002135 nanosheet Substances 0.000 claims description 7
- 239000002270 dispersing agent Substances 0.000 claims description 5
- 239000005543 nano-size silicon particle Substances 0.000 claims description 5
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 claims description 5
- 230000005540 biological transmission Effects 0.000 claims description 3
- 230000036571 hydration Effects 0.000 abstract description 5
- 238000006703 hydration reaction Methods 0.000 abstract description 5
- 238000000034 method Methods 0.000 abstract description 5
- 239000011148 porous material Substances 0.000 abstract description 3
- 238000002310 reflectometry Methods 0.000 description 9
- 239000011358 absorbing material Substances 0.000 description 4
- 239000013078 crystal Substances 0.000 description 4
- 239000002131 composite material Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000005670 electromagnetic radiation Effects 0.000 description 3
- 239000010451 perlite Substances 0.000 description 3
- 235000019362 perlite Nutrition 0.000 description 3
- 239000011398 Portland cement Substances 0.000 description 2
- 239000004567 concrete Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 239000002086 nanomaterial Substances 0.000 description 2
- 239000006096 absorbing agent Substances 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 125000004432 carbon atom Chemical group C* 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000003574 free electron Substances 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 239000012780 transparent material Substances 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
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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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B13/00—Layered products comprising a a layer of water-setting substance, e.g. concrete, plaster, asbestos cement, or like builders' material
- B32B13/04—Layered products comprising a a layer of water-setting substance, e.g. concrete, plaster, asbestos cement, or like builders' material comprising such water setting substance as the main or only constituent of a layer, which is next to another layer of the same or of a different material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
- B32B3/02—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by features of form at particular places, e.g. in edge regions
- B32B3/08—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by features of form at particular places, e.g. in edge regions characterised by added members at particular parts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
- B32B2262/10—Inorganic fibres
- B32B2262/106—Carbon fibres, e.g. graphite fibres
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/20—Properties of the layers or laminate having particular electrical or magnetic properties, e.g. piezoelectric
- B32B2307/212—Electromagnetic interference shielding
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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
- 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
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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
- 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
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00612—Uses not provided for elsewhere in C04B2111/00 as one or more layers of a layered structure
-
- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Structural Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
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- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Building Environments (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
Abstract
The invention discloses a three-layer structure cement-based wave-absorbing plate doped with nano-functional materials and a preparation method thereof. The impedance matching is realized through the design of a three-layer structure, and the broadband absorption is realized within the frequency range of 2-18 GHz; the pore structure of the cement is improved and the hydration process of the cement is accelerated by the complex doping of the nano functional material, so that the compressive strength is enhanced.
Description
Technical Field
The invention belongs to the technical field of building materials and wave-absorbing materials, and particularly relates to a three-layer structure cement-based wave-absorbing plate doped with nano functional materials and a preparation method thereof.
Background
With the development of science and technology, various electronic and electrical devices provide convenience for people in production and life, and electromagnetic wave radiation and interference generated during working influence the life and health of people to a great extent. In order to reduce various hazards of electromagnetic radiation, electromagnetic radiation is currently reduced mainly by two aspects of electromagnetic wave absorption and shielding. The filler with the wave absorbing function is mixed, and the multi-layer structure functional design is carried out, so that the energy of the electromagnetic wave is converted into heat energy or energy consumption in other forms to the maximum extent, and the harm caused by electromagnetic radiation can be fundamentally solved.
The cement-based wave-absorbing material with the multilayer structure mainly utilizes an impedance gradual change method to realize the matching of the interface impedance of the wave-absorbing material and the spatial wave impedance, so that incident electromagnetic waves are not excessively reflected on the surface of the wave-absorbing material, and the electromagnetic waves incident into the material are absorbed or attenuated for multiple times through an absorbing layer and an absorbing and reflecting layer to be consumed. "a cement-based wave-absorbing plate with a three-layer structure and a composite wave-absorbing agent of EP and NGPs and a preparation method thereof" (CN 109457826A) discloses a cement-based wave-absorbing plate with a three-layer structure, wherein an upper layer plate is doped with Expanded Perlite (EP), a middle layer plate is doped with multilayer graphene Nanosheets (NGPs) and nano nickel particles, and a lower layer plate is doped with carbon fibers and carbon black. However, the intensity of the wave-transmitting material expanded perlite doped in the upper plate (matching layer) is lower, and the wave-transmitting material expanded perlite is doped in the cement-based material to form a honeycomb cavity structure, so that the intensity of the matching layer material is greatly reduced; and the porosity and the electromagnetic parameters of the cement paste can be adjusted by adjusting the type and the dosage of the wave-transparent material in the matching layer, so that the matching degree of the impedance of the composite material and the impedance of the spatial wave is improved, and the integral wave-absorbing performance is enhanced.
Disclosure of Invention
The invention provides a three-layer structure cement-based wave-absorbing plate doped with nano functional materials and a preparation method thereof.
The technical problem of the invention can be realized by the following technical scheme:
a cement-based wave absorption plate with a three-layer structure and doped with Nano functional materials comprises a matching layer, an absorption layer and an absorption reflection layer, wherein the matching layer comprises Nano silicon nitride (Nano-Si)3N4) The wave-transparent performance is enhanced; the absorption layer comprises graphene Nano Sheets (NGPs) and Nano nickel particles (Nano-Ni), and the magnetic medium type absorbs electromagnetic waves and reduces reflection and transmission of the electromagnetic waves; the absorption and reflection layer comprises Carbon Fibers (CF) and Carbon Black (CB) to form a closed conductive network, so that the electromagnetic waves are prevented from passing through, part of energy of the electromagnetic waves is converted into electric heating energy, and the other part of the electromagnetic waves are reflected to the absorption layer to be continuously absorbed.
The invention mixes nanometer functional material into three-layer structure cement-based wave absorption plate, wherein, Nano-Si3N4The ceramic-based nano material prepared by a special process has small particle size, large specific surface area, high mechanical strength, high temperature resistance and better wave-transmitting performance, can form a compact dispersed phase in a composite material, and enhances the mechanical strength. NGPs are represented by sp2Two adjacent carbon atoms are connected by sigma bonds, free electrons vertical to the crystal plane form pi bonds, and the pi electrons can move freely in the crystal structure plane, so that the two-dimensional nano structure has higher electromagnetic wave absorption and conductivity. Moreover, low amounts of NGPs can accelerate the hydration process of cement and improve the pore structure of cement byThe cement hydration product provides a crystallization point position, so that the cement hydration product is toughened and thickened, and the mechanical property is obviously improved.
Furthermore, the doping amount of the nano silicon nitride in the matching layer is 2%, the doping amount of the graphene nanosheet in the absorption layer is 0.025% -0.05%, the doping amount of the nano nickel particles in the absorption layer is 0.75%, the doping amount of the carbon fiber in the absorption reflection layer is 0.5% -1%, and the doping amount of the carbon black in the absorption reflection layer is 4%.
Furthermore, the thickness ratio of the matching layer to the absorption reflection layer is 8:11: 11.
A preparation method of a three-layer structure cement-based wave absorption plate doped with nanometer functional materials comprises the following steps:
(1) adding water with the temperature of 60 ℃ into a container, slowly adding a dispersing agent into the water, stirring until the dispersing agent is fully dissolved, then adding carbon fibers into the container, and uniformly stirring to fully disperse the carbon fibers to form a carbon fiber dispersion liquid; pouring cement, silica fume and carbon black into a stirring pot, adding the required carbon fiber dispersion liquid after uniformly stirring, uniformly stirring again, finally adding the rest water and the water reducing agent, stirring at a low speed for 2.5 min, stopping for 20s, and stirring at a high speed for 2.5 min to obtain the slurry required by the absorption and reflection layer;
(2) pouring cement, silica fume and nano nickel particles into a stirring pot, uniformly stirring, adding the multilayer graphene nanosheet dispersion liquid into the mixture, uniformly stirring, finally adding water and a water reducing agent, stirring at a low speed for 2.5 min, stopping stirring for 20s, and stirring at a high speed for 2.5 min to obtain slurry required by the absorption layer;
(3) mixing cement, silica fume and Nano-Si3N4Pouring into a stirring pot, adding water and a water reducing agent after uniformly stirring, stirring the mixture at a low speed for 2 min, stopping stirring for 20s, and stirring at a high speed for 2 min to obtain slurry required by the matching layer;
(4) after a three-layer overlapping mould is selected for layered pouring, the mixture is placed into a constant temperature and humidity box (the temperature is 20 +/-2 ℃ and the relative humidity is more than 90 percent), and demoulding is carried out after 24 hours, and the curing is continued under the condition.
Compared with the prior art, the invention has the following beneficial technical effects:
1) the invention designs the Nano-Si through the matching layer, the absorption layer and the absorption reflection layer3N4And the NGPs, Nano-Ni, CF and CB are subjected to layered complex doping to realize impedance matching. The obtained three-layer structure cement-based wave absorption plate has the minimum reflectivity of-18.8 dB and the maximum bandwidth of 16GHz within the test frequency range of 2-18 GHz, wherein the maximum bandwidth is less than-10 dB, the effect of absorbing electromagnetic waves is remarkable, the broadband absorption target is achieved, and the three-layer structure cement-based wave absorption plate can be widely applied to important civil buildings and common military facilities to absorb and shield electromagnetic waves.
2) The invention uses NGPs and Nano-Si3N4When the nanometer functional material is applied to the cement-based wave absorption plate, the compressive strength is enhanced through the functions of improving the pore structure of cement and accelerating the hydration process of the cement. The compressive strength of the obtained three-layer structure cement-based wave-absorbing plate in 7 days and 28 days respectively reaches over 38.7MPa and 49.3MPa, and meets the requirement of C80 concrete compressive strength in concrete structure design specifications.
Drawings
FIG. 1 is the example 1 doping with 2% Nano-Si3N4The reflectivity of the matching layer cement-based wave-absorbing plate is improved.
FIG. 2 shows the reflectivity of the three-layer structure cement-based wave-absorbing plate of the nano-functional materials with different doping amounts in examples 2-4.
Detailed Description
The performance requirements of each material are as follows:
cement: the quality of the P.II 42.5-grade portland cement meets the requirements of the general portland cement GB175-2007 specification.
Nano-Ni performance index: purity of>99.9wt%, average particle diameter of 50nm, specific surface area of 23.2 m2/g, and bulk density of 0.22g/cm3The crystal form is nearly spherical and the color is black.
Performance indexes of NGPs: purity is up to>99.5wt%, diameter of 5-10 μm, thickness of 0.4-20nm, number of layers of 1-5 layers, and density of 0.23g/cm3Volume resistivity 4X 10-4ohm·cm。
Nano-Si3N4The performance indexes are as follows: purity of>99.9wt%, average particle diameter of 500nm, and specific surface area of 10.3 m2A volume density of 0.116 g/g/cm3The crystal is in the shape of a face-centered cube and is off-white in color.
The CF performance index is as follows: diameter of<8 μm, carbon content>95% tensile strength>3500MPa, tensile modulus>210GPa, elongation<2.1% and a density of 1.74 to 1.79 x 103kg/m3The resistivity is 1.0 to 1.6 Ω · cm.
The silica fume performance index is as follows: total alkalinity<1.5%，SiO2Content (wt.)>85% of activity index>105% and a specific surface area of 15m2Water absorption per gram<125% water content<3.0%。
Example 1
Taking the mass of the cement as unit 1, and the mass ratio of other components as Nano-Si3N4: 2 percent; silica fume: 10 percent; water reducing agent: 0.32 percent; water-cement ratio: 0.42. weighing the components in proportion, and mixing the cement, the silica fume and the Nano-Si3N4Pouring into a stirring pot, adding water and a water reducing agent after uniformly stirring, stirring the mixture at a low speed for 2 min, stopping stirring for 20s, stirring at a high speed for 2 min to obtain slurry required by a matching layer, pouring into a cement-based wave absorption plate with the thickness of 8mm by using a mould, placing into a constant temperature and humidity box (the temperature is 20 +/-2 ℃, and the relative humidity is more than 90%), demoulding after 24 h, and continuously maintaining for 28 days under the conditions.
As shown in figure 1, the minimum reflectivity of the obtained cement-based wave absorption plate is up to-2.11 dB at the frequency of 2.25GHz within the frequency range of 2-18 GHz, the effective bandwidth of the cement-based wave absorption plate is up to 8.97GHz higher than-1 dB, the reflection loss of the matching layer is low, and positive values appear in certain frequency bands, so that the electromagnetic waves at the position are completely transmitted. Compared with common cement-based materials (the reflectivity is-3 to-4 dB), the Nano-Si is doped3N4The matching layer cement paste has good wave-transmitting performance and accords with the design of the matching layer.
Example 2
Taking the mass of the cement as unit 1, and the mass ratio of other components is as follows:
wave-transparent layer: Nano-Si3N4: 2 percent; silica fume: 10 percent; water reducing agent: 0.32 percent; water-cement ratio: 0.42;
an absorption layer: and (3) NGPs: 0.025 percent; Nano-Ni: 0.75 percent; silica fume: 10 percent; water reducing agent: 0.33 percent; water-cement ratio: 0.32 of;
absorption and reflection layer: CF: 0.5 percent; CB: 4 percent; silica fume: 10 percent; water reducing agent: 0.35 percent; water-cement ratio: 0.74 of;
the preparation steps are as follows:
(1) adding water with the temperature of 60 ℃ into a container, slowly adding a dispersing agent into the water, stirring until the dispersing agent is fully dissolved, then adding carbon fibers into the container, and uniformly stirring to fully disperse the carbon fibers to form a carbon fiber dispersion liquid; pouring cement, silica fume and carbon black into a stirring pot, adding the required carbon fiber dispersion liquid after uniformly stirring, uniformly stirring again, finally adding the rest water and the water reducing agent, stirring at a low speed for 2.5 min, stopping for 20s, and stirring at a high speed for 2.5 min to obtain the slurry required by the absorption and reflection layer;
(2) pouring cement, silica fume and nano nickel particles into a stirring pot, uniformly stirring, adding the multilayer graphene nanosheet dispersion liquid into the mixture, uniformly stirring, finally adding water and a water reducing agent, stirring at a low speed for 2.5 min, stopping stirring for 20s, and stirring at a high speed for 2.5 min to obtain slurry required by the absorption layer;
(3) pouring cement, silica fume and Nano-SiN4 into a stirring pot, uniformly stirring, adding water and a water reducing agent, stirring the mixture at a low speed for 2 min, stopping stirring for 20s, and stirring at a high speed for 2 min to obtain slurry required by the matching layer;
(4) and (3) selecting a three-layer laminating die for pouring in a layered mode, placing the absorption reflection layer with the thickness of 11cm, the absorption layer with the thickness of 11cm and the matching layer with the thickness of 8cm into a constant temperature and humidity box (the temperature is 20 +/-2 ℃, and the relative humidity is more than 90%), demoulding after 24 hours, and continuously maintaining for 28 days under the conditions.
As shown in FIG. 2, the obtained three-layer structure cement-based wave absorption plate has the minimum reflectivity of 2.82GHz, up to-14.9 dB and the effective bandwidth of 13.33GHz less than-10 dB within the frequency range of 2-18 GHz.
The compressive strength of the three-layer structure cement-based wave-absorbing plate in 7 days and 28 days is 41.3MPa and 52.7MPa respectively.
Example 3
Taking the mass of the cement as unit 1, and the mass ratio of other components is as follows:
wave-transparent layer: Nano-Si3N4: 2 percent; silica fume: 10 percent; water reducing agent: 0.32 percent;water-cement ratio: 0.42;
an absorption layer: and (3) NGPs: 0.025 percent; Nano-Ni: 0.75 percent; silica fume: 10 percent; water reducing agent: 0.33 percent; water-cement ratio: 0.32 of;
absorption and reflection layer: CF: 1.0 percent; CB: 4 percent; silica fume: 10 percent; water reducing agent: 0.36 percent; water-cement ratio: 0.80;
the preparation is as described in example 2.
As shown in FIG. 2, the obtained three-layer structure cement-based wave absorption plate has the minimum reflectivity of 2.3GHz and up to-15.9 dB within the frequency range of 2-18 GHz, and the effective bandwidth of less than-10 dB and up to 16 GHz.
The compressive strength of the three-layer structure cement-based wave-absorbing plate in 7 days and 28 days is 38.7MPa and 49.3MPa respectively.
Example 4
Taking the mass of the cement as unit 1, and the mass ratio of other components is as follows:
wave-transparent layer: Nano-Si3N4: 2 percent; silica fume: 10 percent; water reducing agent: 0.32 percent; water-cement ratio: 0.42;
an absorption layer: and (3) NGPs: 0.05 percent; Nano-Ni: 0.75 percent; silica fume: 10 percent; water reducing agent: 0.35 percent; water-cement ratio: 0.33;
absorption and reflection layer: CF: 0.5 percent; CB: 4 percent; silica fume: 10 percent; water reducing agent: 0.35 percent; water-cement ratio: 0.74 of;
the preparation is as described in example 2.
As shown in FIG. 2, the obtained three-layer structure cement-based wave absorption plate has the minimum reflectivity of 2.45GHz within the frequency range of 2-18 GHz, the minimum reflectivity of-16.98 dB and the effective bandwidth of less than-10 dB of 15.96 GHz.
The compressive strength of the cement-based wave-absorbing plate with the three-layer structure in 7 days and 28 days is 43.3MPa and 52.7MPa respectively.
Claims (4)
1. A cement-based wave absorption plate with a three-layer structure and doped with nano functional materials is characterized by comprising a matching layer, an absorption layer and an absorption reflection layer, wherein the matching layer comprises nano silicon nitride and enhances the wave transmission performance; the absorption layer comprises graphene nanosheets and nano nickel particles, and the magnetic medium type absorbs electromagnetic waves and reduces reflection and transmission of the electromagnetic waves; the absorption and reflection layer comprises carbon fibers and carbon black to form a closed conductive network to prevent the electromagnetic waves from passing through, so that part of energy of the electromagnetic waves is converted into electric heat energy, and the other part of the electromagnetic waves are reflected to the absorption layer to be continuously absorbed.
2. The cement-based wave absorption plate with a three-layer structure and a complex doped nano functional material as claimed in claim 1, wherein the doped amount of the nano silicon nitride in the matching layer is 2%, the doped amount of the graphene nano sheet in the absorption layer is 0.025% -0.05%, the doped amount of the nano nickel particles in the absorption layer is 0.75%, the doped amount of the carbon fiber in the absorption reflection layer is 0.5% -1%, and the doped amount of the carbon black in the absorption reflection layer is 4%.
3. The cement-based wave absorption plate with a three-layer structure and a complex doped nano-functional material as claimed in claim 1, wherein the thickness ratio of the matching layer, the absorption layer and the absorption reflection layer is 8:11: 11.
4. The preparation method of the three-layer structure cement-based wave absorption plate doped with the nano functional material as claimed in claim 1, is characterized by comprising the following steps:
(1) adding warm water and a dispersing agent into a container, stirring until the mixture is fully dissolved, then adding carbon fibers, and uniformly stirring to fully disperse the carbon fibers to form a carbon fiber dispersion liquid; pouring cement, silica fume and carbon black into a stirring pot, adding the required carbon fiber dispersion liquid after uniformly stirring, uniformly stirring again, finally adding the rest water and the water reducing agent, and uniformly stirring to obtain the slurry required by the absorption and reflection layer;
(2) pouring cement, silica fume and nano nickel particles into a stirring pot, uniformly stirring, adding the multilayer graphene nanosheet dispersion liquid into the mixture, uniformly stirring, finally adding water and a water reducing agent, and uniformly stirring to obtain the slurry required by the absorption layer;
(3) pouring cement, silica fume and nano silicon nitride into a stirring pot, adding water and a water reducing agent after uniformly stirring, and uniformly stirring the mixture again to obtain the slurry required by the matching layer;
(4) and after three-layer overlapped mould is selected for layered pouring, the mixture is placed into a constant temperature and humidity box, and demoulding is carried out after 24 hours, and the curing is continued under the condition.
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| CN113754370A (en) * | 2021-08-26 | 2021-12-07 | 北京工业大学 | Preparation method of electromagnetic wave-transparent concrete |
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| CN116354658A (en) * | 2023-04-04 | 2023-06-30 | 西南石油大学 | Cement-based foam wave-absorbing plate with full-medium periodic array structure and preparation method thereof |
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Application publication date: 20201027 |