CN109265127B - Preparation method of high-strength high-toughness electromagnetic protection material for 3D printing - Google Patents
Preparation method of high-strength high-toughness electromagnetic protection material for 3D printing Download PDFInfo
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- CN109265127B CN109265127B CN201811373205.9A CN201811373205A CN109265127B CN 109265127 B CN109265127 B CN 109265127B CN 201811373205 A CN201811373205 A CN 201811373205A CN 109265127 B CN109265127 B CN 109265127B
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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
- C04B28/34—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 cold phosphate binders
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y10/00—Processes of additive manufacturing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y70/00—Materials specially adapted for additive manufacturing
-
- 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
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
- C04B41/50—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials
- C04B41/5076—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials with masses bonded by inorganic cements
- C04B41/5092—Phosphate 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
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/60—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone of only artificial stone
- C04B41/61—Coating or impregnation
- C04B41/65—Coating or impregnation with inorganic materials
- C04B41/67—Phosphates
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/62—Insulation or other protection; Elements or use of specified material therefor
- E04B1/92—Protection against other undesired influences or dangers
-
- 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
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/62—Insulation or other protection; Elements or use of specified material therefor
- E04B1/92—Protection against other undesired influences or dangers
- E04B2001/925—Protection against harmful electro-magnetic or radio-active radiations, e.g. X-rays
Abstract
The invention relates to a preparation method of a high-strength high-toughness electromagnetic protection material for 3D printing, which utilizes phosphate cement, polyacrylonitrile short fiber and nano Fe3O4With SiO2The prepared wave absorbing agent is used for preparing the wave absorbing-reinforcing integrated functional phosphate cement MPC, and the double-layer MPC is printed on the surface layer of the concrete through the intelligent, flexible and accurate 3D printing technology, so that the double effects of quick electromagnetic protection and fracture toughness improvement of the concrete structure are achieved. The process has the advantages of simple and convenient process, easy operation, obviously improved electromagnetic protection effect and fracture toughness of the concrete structure, good stability and better application prospect.
Description
Technical Field
The invention belongs to the technical field of novel building materials. In particular to a preparation method of a high-strength high-toughness electromagnetic protection material for 3D printing.
Background
At present, the technology and research on electromagnetic protection of a concrete structure are more, electromagnetic protection paint is most widely applied due to the advantages of low cost, simple and convenient process, strong applicability, no need of special equipment and the like, and the electromagnetic protection effect can be achieved by smearing a layer of paint on the surface layer of a building structure. The 3D printing technology is widely applied due to the characteristics of no modeling, intellectualization, flexibility, rapidness and the like. The 3D printing technology and the electromagnetic protection technology are combined, so that the electromagnetic pollution environment can be effectively purified, and the green electromagnetic ecological balance is established.
However, conventional electromagnetic shielding materials include: electromagnetic wave absorbing material and electromagnetic shielding material (such as epoxy-based electromagnetic protective paint) and construction process: including manual construction and spraying process, although can reach certain electromagnetic protection requirement, from the aspect of technology and durability, still have some problems, specifically as follows:
1) the electromagnetic protection material has poor stability: the common electromagnetic shielding material is mostly a smearing type epoxy-based electromagnetic protection coating, and the electromagnetic protection material is smeared on the surface layer of the building structure, so that electromagnetic waves are reflected on the surface of the protection coating and cannot enter the structure, and the electromagnetic protection effect is achieved. But the electromagnetic protection material is easy to be affected by the change of environmental temperature and humidity and different use modes, so that the problems of short service life, easy falling, easy cracking, poor environmental friendliness and the like are caused, and the electromagnetic protection performance of the electromagnetic protection material is seriously reduced. The research on the commonly used electromagnetic wave-absorbing materials mostly focuses on the common portland cement-based electromagnetic protection materials, and the materials have poor adhesion, cannot be adhered to the surface layer of the existing structure, and cannot achieve the effect of quickly repairing the electromagnetic protection.
2) The electromagnetic protection effect is poor: the traditional construction process is that the electromagnetic protection material is stirred and coated manually, and the uniformity of all material compositions and coating processes cannot be ensured, so that the thickness and material uniformity of an electromagnetic protection layer cannot be ensured, and the local electromagnetic protection is easy to lose effectiveness. And the construction steps of manufacturing the electromagnetic protection structure by the traditional manual painting and spraying process are complicated, the construction level requirement is high, the construction quality is difficult to ensure, and the electromagnetic protection effect is also reduced. In addition, the surface layer structure of the protective coating cannot be textured (such as an "S-shaped", "X-shaped" or strip-shaped structure) by manually coating, which greatly reduces the absorption efficiency of electromagnetic waves.
3) Low strength and toughness: the common cement-based electromagnetic protection materials are mostly resistance type and dielectric type wave-absorbing aggregate modified cement-based materials, and have the advantages of single functionality, low strength and toughness and easy damage to the protection layer under the action of external force. For example, graphite modified cement-based materials have reduced structural performance because the addition of graphite reduces the workability and strength index of the concrete; the ferrite modified cement-based material has a single functional type, only has electromagnetic protection performance, and cannot ensure the strength and toughness of the material.
Disclosure of Invention
The invention aims to solve the technical problems and provides a preparation method of a high-strength high-toughness electromagnetic protection material for 3D printing. The method is simple and easy to operate, and the multifunctional material is used for protecting and repairing a concrete structure, and has good electromagnetic protection effect, fracture toughness and structural stability.
In order to achieve the purpose, the invention adopts the technical scheme that:
a preparation method of a high-strength and high-toughness electromagnetic protection material for 3D printing comprises the following steps:
phosphate component: calcining MgO at 1750 deg.C for 45min, and sieving to obtain particle with diameter less than 20 μm; the particle size of the screened high iron fly ash is between 30 and 45 micrometers, and the density is more than 2.8g/cm3(ii) a The potassium dihydrogen phosphate is analytically pure; borax is analytically pure; the mass mixing ratio is MgO: high iron fly ash: potassium dihydrogen phosphate, borax 1:0.3:0.75: 0.05;
water: deionized water, the mixing amount is 30% of the MgO mass; the water reducing agent is a polycarboxylic acid water reducing agent, and the mixing amount is 2-5% of the water mass;
fiber: polyacrylonitrile short fiber with the fiber length of 3mm, the diameter of 10-25 μm and the volume mixing amount of 8% of MgO volume;
wave-absorbing aggregate: preparation of nano Fe by coprecipitation method3O4And with SiO2Complex doping of SiO2Has a particle size of less than 100nm, mFe3O4：m SiO2The ratio of the wave-absorbing aggregate to the MgO is 3:1, and the mixing amount of the wave-absorbing aggregate is 60-90 percent of the mass of the MgO;
the method comprises the following steps: firstly, uniformly mixing water and a water reducing agent to form an aqueous solution; mixing and stirring the wave-absorbing aggregate, the high iron fly ash, the monopotassium phosphate, the borax and the fibers for not less than 5min, and then adding and stirring 4/5 aqueous solution for not less than 3 min; and finally, adding MgO and the residual 1/5 aqueous solution, and stirring until the mixture is uniform, so that the preparation of the 3D printing electromagnetic protection material is completed.
An electromagnetic protection concrete structure is characterized by sequentially comprising a concrete surface layer, a reinforcement-wave absorption layer and a surface layer texture structure from inside to outside, wherein the reinforcement-wave absorption layer is printed on the concrete surface layer by adopting the electromagnetic protection material through a 3D printing technology according to the mode that each layer is 1.3 +/-0.1 mm per layer, and the thickness of the reinforcement-wave absorption layer is 6.5 +/-0.1 mm; the surface texture structure is S-shaped or corrugated, honeycomb-shaped or pyramid-shaped, the width of the corrugation in the corrugated shape is 2 +/-0.2 mm, and the height of the corrugation is 2 +/-0.2 mm; the surface texture structure is also obtained by 3D printing by adopting the electromagnetic protection material.
Compared with the prior art, the invention enriches the existing electromagnetic protection method well, and innovates from the aspects of material preparation and construction process, and has the main advantages that:
1) the electromagnetic protection effect is stable: the magnesium phosphate cement is an inorganic cementing material, has the advantages of high strength, good working efficiency, high temperature resistance, adhesiveness and the like, and has been proved by the prior researches: the bonding strength of the magnesium phosphate cement and the concrete interface is more than 2.5MPa, the expansion degree is more than 160mm, the 1h compressive strength reaches 30MPa, and fibers are uniformly distributed in the magnesium phosphate cement, so that a protective layer structure with high strength and high toughness can be formed on the concrete surface layer, the possibility of stripping damage of the protective layer is eliminated, and the stability of electromagnetic protection is improved.
2) The electromagnetic protection efficiency is high: the accuracy of printing the size can be guaranteed in intelligent, high-accuracy and rapid 3D printing, various complex structures (such as pyramid structures, corrugated structures, honeycomb structures and the like) can be rapidly manufactured, construction is rapid and accurate, and an electromagnetic protection layer and a structural layer are guaranteed to reach the design standard of electromagnetic protection efficiency.
3) The double functions of reinforcement and electromagnetic shielding are as follows: the magnesium phosphate cement has the performance of quick hardening and high strength, and is combined with the fiber toughening effect, so that the electromagnetic protective layer has the reinforcing effect of high strength and high toughness, and the bearing capacity of the structure is improved.
The invention utilizes phosphate cement, polyacrylonitrile short fiber and nano Fe3O4With SiO2The prepared wave absorbing agent is used for preparing wave absorbing-reinforcing integrated functional phosphate cement MPC, and the intelligent, flexible and precise 3D printing technology is used for printing on concreteThe surface layer is printed with double-layer MPC (bottom layer: strengthening-wave absorbing layer, surface layer: texture structure), thereby achieving the double effects of rapid electromagnetic protection and fracture toughness improvement of the concrete structure. The process has the advantages of simple and convenient process, easy operation, obviously improved electromagnetic protection effect and fracture toughness of the concrete structure, good stability and better application prospect.
Compared with common energy consumption materials, electromagnetic protection materials and conventional construction technical methods, the electromagnetic protection method for the concrete structure has the advantages of high strength, high toughness, intellectualization, high accuracy, high stability, high absorption, wide screen band, simple and quick process, easiness in operation, good stability and the like, the electromagnetic protection effect and the toughness performance of the concrete structure are obviously improved, the intelligent market requirements of concrete structure reinforcement and electromagnetic protection are met, and the electromagnetic protection method for the concrete structure has a wide application prospect.
Detailed Description
The present invention is further explained with reference to the following examples, which should not be construed as limiting the scope of the present invention.
The invention discloses a preparation method of a high-strength and high-toughness electromagnetic protection material for 3D printing, wherein the electromagnetic protection material comprises the following components:
phosphate component: calcining MgO at 1750 deg.C for 45min, and sieving to obtain particle with diameter less than 20 μm; the particle size of the screened high iron fly ash is between 30 and 45 micrometers, and the density is more than 2.8g/cm3(ii) a The potassium dihydrogen phosphate is analytically pure; borax is analytically pure; the mass mixing ratio is MgO: high iron fly ash: potassium dihydrogen phosphate, borax 1:0.3:0.75: 0.05;
water: deionized water, the mixing amount is 30% of the MgO mass; the water reducing agent is a polycarboxylic acid water reducing agent, and the mixing amount is 2-5% of the water mass;
fiber: polyacrylonitrile short fiber with the fiber length of 3mm, the diameter of 10-25 μm and the volume mixing amount of 8% of MgO volume;
wave-absorbing aggregate: preparation of nano Fe by coprecipitation method3O4And with SiO2Complex doping of SiO2Has a particle size of less than 100nm, mFe3O4：m SiO2The mixing amount of the wave-absorbing aggregate is 60 percent of the mass of MgO-90％；
The method comprises the following steps: firstly, uniformly mixing water and a water reducing agent to form an aqueous solution; mixing and stirring the wave-absorbing aggregate, the high iron fly ash, the monopotassium phosphate, the borax and the fibers for not less than 5min, and then adding and stirring 4/5 aqueous solution for not less than 3 min; and finally, adding MgO and the rest 1/5 aqueous solution, and stirring for at least 2min until the mixture is uniform, so that the preparation of the 3D printing electromagnetic protection material is completed.
The invention also protects an electromagnetic protection concrete structure, which sequentially comprises a concrete surface layer, a reinforcement-wave absorption layer and a surface layer texture structure from inside to outside, wherein the reinforcement-wave absorption layer is printed on the concrete surface layer by adopting the electromagnetic protection material through a 3D printing technology according to a mode that each layer is 1.3 +/-0.1 mm per layer, and the thickness of the reinforcement-wave absorption layer is 6.5 +/-0.1 mm; the surface texture structure is S-shaped or corrugated, honeycomb-shaped or pyramid-shaped, the width of the corrugation in the corrugated shape is 2 +/-0.2 mm, and the height of the corrugation is 2 +/-0.2 mm; the surface texture structure is also obtained by 3D printing by adopting the electromagnetic protection material.
The iron content in the high iron fly ash is Fe2O3The iron content is 30-35%.
The raw materials in the examples are as follows:
phosphate component:
calcining MgO in a high temperature furnace at 1750 ℃ for 45min, and screening through 20 mu m aperture; selecting the density of more than 2.8g/cm3High iron fly ash, and screening the particle size to be within the range of 30-45 μm; the potassium dihydrogen phosphate is analytically pure; borax is analytically pure. Weighing the components according to the mixing proportion of the magnesium phosphate cement, wherein the weight ratio of MgO: fly ash: potassium dihydrogen phosphate, borax 1:0.3:0.75: 0.05.
Water: deionized water, the mixing amount is 30% of the MgO mass. The water reducing agent is a polycarboxylic acid water reducing agent, and the mixing amount is 2%, 3.5% and 5% of the water mass.
Fiber: polyacrylonitrile staple fibers having a fiber length of 3mm and diameters of 10 μm, 18 μm and 25 μm. The volume mixing amount of the fiber is 8 percent of the volume of MgO;
wave-absorbing aggregate: preparation of nano Fe by coprecipitation method3O4；SiO2Has a particle diameter of less than 100nmAccording to m Fe3O4：m SiO2Table of mass 3:1 Fe3O4And SiO2The composite doping is uniform to form wave-absorbing aggregate, and the doping amount of the wave-absorbing aggregate is 60%, 75% and 90% of the mass of MgO.
The preparation process of the electromagnetic protection material in the embodiment is as follows: firstly, well mixing weighed water and a water reducing agent to form an aqueous solution; mixing and stirring the wave-absorbing aggregate, the high iron fly ash, the monopotassium phosphate, the borax and the fibers for not less than 5min, adding 4/5 aqueous solution, stirring for not less than 3min, adding MgO and the rest 1/5 aqueous solution, and stirring for at least 2min until the mixture is uniform, thereby completing the preparation of the electromagnetic protection material capable of 3D printing. And inputting the preparation process of the 3D printed electromagnetic protection material into a 3D printing control system.
The construction method in the embodiment comprises the following steps:
concrete surface treatment: polishing the surface layer of the concrete to remove loose particles, manufacturing pits by using a small hammer, and removing floating dust;
reinforcing and wave-absorbing layer: printing electromagnetic protection material slurry capable of being printed in a 3D mode on a concrete surface layer through a high-precision and intelligent 3D printing technology, wherein the printing thickness is 6.5 +/-0.1 mm according to a mode that each layer is 1.3 +/-0.1 mm per layer;
surface texture structure: on the printed reinforcing-wave absorbing layer, 3D printing is carried out on electromagnetic protection material slurry capable of being printed in a 3D mode to form a corrugated structure with a designed size, wherein the width of corrugations is 2 +/-0.2 mm, and the height of the corrugations is 2 +/-0.2 mm;
the wave absorbing and reinforcing layer can be used for water-proof maintenance for more than 6 hours in outdoor environment.
The experiments were divided into 3 groups: the mixing amount of the wave-absorbing aggregate of the group 1 is 60 percent; the mixing amount of the wave-absorbing aggregate of the group 2 is 75 percent; the mixing amount of the wave-absorbing aggregate of the group 3 is 90 percent. The other components are the same as the preparation process and the construction method.
The electromagnetic wave reflectivity of the magnesium phosphate cement structure and the like are measured by a vector network analyzer and a coaxial transmission method in the test. The method is characterized in that the drop hammer impact test is adopted to determine the impact strength of the magnesium phosphate cement surface layer and the three-point bending notched beam test is adopted to determine the fracture toughness of the magnesium phosphate cement according to the general concrete mechanical property test method (GB/T50081-2002).
The test results of the examples are shown in tables 1 to 3.
Electromagnetic parameters, impact strength and fracture toughness of 3D printed electromagnetic protection material in group 1 of Table 1
Note: the electromagnetic frequency range of the electromagnetic parameter test is 2-18 GHz; the frequency bandwidth is the frequency bandwidth when the reflectivity of the electromagnetic wave is higher than-10 dB; the fracture energy is the area contained by the displacement-fracture opening strain curve and the coordinate axis of the three-point bending notch beam.
Table 2 electromagnetic parameters, impact strength and fracture toughness of 3D printed electromagnetic shielding material in group 2
Note: the electromagnetic frequency range of the electromagnetic parameter test is 2-18 GHz; the frequency bandwidth is the frequency bandwidth when the reflectivity of the electromagnetic wave is higher than-10 dB; the fracture energy is the area contained by the displacement-fracture opening strain curve and the coordinate axis of the three-point bending notch beam.
Table 3 electromagnetic parameters, impact strength and fracture toughness of 3D printed electromagnetic protection material in group 3
Note: the electromagnetic frequency range of the electromagnetic parameter test is 2-18 GHz; the frequency bandwidth is the frequency bandwidth when the reflectivity of the electromagnetic wave is higher than-10 dB; the fracture energy is the area contained by the displacement-fracture opening strain curve and the coordinate axis of the three-point bending notch beam.
The experimental results can be obviously seen that: this application can 3D print electromagnetic protection material, improvement concrete structure's that can be obvious electromagnetic protection performance, impact strength and toughness can. The application of the technology is a simple and efficient concrete structure electromagnetic protection method, and can be popularized and used.
Claims (2)
1. A preparation method of a high-strength and high-toughness electromagnetic protection material for 3D printing comprises the following steps:
phosphate cement component: calcining MgO at 1750 deg.C for 45min, and sieving to obtain particle with diameter less than 20 μm; the particle size of the screened high iron fly ash is between 30 and 45 micrometers, and the density is more than 2.8g/cm3(ii) a The potassium dihydrogen phosphate is analytically pure; borax is analytically pure; the mass mixing ratio is MgO: high iron fly ash: potassium dihydrogen phosphate, borax 1:0.3:0.75: 0.05;
water: deionized water, the mixing amount is 30% of the MgO mass; the water reducing agent is a polycarboxylic acid water reducing agent, and the mixing amount is 2-5% of the water mass;
fiber: polyacrylonitrile short fiber with the fiber length of 3mm, the diameter of 10-25 μm and the volume mixing amount of 8% of MgO volume;
wave-absorbing aggregate: preparation of nano Fe by coprecipitation method3O4And with SiO2Complex doping of SiO2Has a particle size of less than 100nm, m Fe3O4：m SiO2The ratio of the wave-absorbing aggregate to the MgO is 3:1, and the mixing amount of the wave-absorbing aggregate is 60-90 percent of the mass of the MgO;
the method comprises the following steps: firstly, uniformly mixing water and a water reducing agent to form an aqueous solution; mixing and stirring the wave-absorbing aggregate, the high iron fly ash, the monopotassium phosphate, the borax and the fibers for not less than 5min, and then adding and stirring 4/5 aqueous solution for not less than 3 min; finally, adding MgO and the residual 1/5 aqueous solution, and stirring until the mixture is uniform, so that the preparation of the 3D printing electromagnetic protection material is completed;
the iron content in the high iron fly ash is Fe2O3The iron content is 30-35%;
phosphate cement, polyacrylonitrile staple fiber and nano Fe3O4With SiO2The prepared wave-absorbing agent is used for preparing a wave-absorbing-reinforcing integrated 3D printing high-strength and high-toughness electromagnetic protection material, and the dual effects of quick electromagnetic protection and fracture toughness improvement of a concrete structure are achieved.
2. An electromagnetic protection concrete structure is characterized in that the structure sequentially comprises a concrete surface layer, a reinforcement-wave absorption layer and a surface layer texture structure from inside to outside, wherein the reinforcement-wave absorption layer is printed on the concrete surface layer by adopting the electromagnetic protection material of claim 1 through a 3D printing technology according to the mode that each layer is 1.3 +/-0.1 mm, and the thickness of the reinforcement-wave absorption layer is 6.5 +/-0.1 mm; the surface texture structure is S-shaped or corrugated, honeycomb-shaped or pyramid-shaped, the width of the corrugation in the corrugated shape is 2 +/-0.2 mm, and the height of the corrugation is 2 +/-0.2 mm; the surface texture is also obtained by 3D printing using the electromagnetic shielding material according to claim 1.
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| CN114686138A (en) * | 2022-05-07 | 2022-07-01 | 河北工业大学 | Magnesium phosphate cement-based electromagnetic wave-absorbing concrete canvas |
| 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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