CN109516744A - A kind of waveform electromagnetic wave absorption concrete structure based on 3D printing - Google Patents
A kind of waveform electromagnetic wave absorption concrete structure based on 3D printing Download PDFInfo
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- CN109516744A CN109516744A CN201910051846.0A CN201910051846A CN109516744A CN 109516744 A CN109516744 A CN 109516744A CN 201910051846 A CN201910051846 A CN 201910051846A CN 109516744 A CN109516744 A CN 109516744A
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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
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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
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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
- C04B2111/00034—Physico-chemical characteristics of the mixtures
- C04B2111/00181—Mixtures specially adapted for three-dimensional printing (3DP), stereo-lithography or prototyping
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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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- Manufacturing & Machinery (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
Abstract
The present invention is a kind of waveform electromagnetic wave absorption concrete structure based on 3D printing, the concrete structure is made of horizontal waveform concrete fin lamination accumulation from level to level, lamination height D between adjacent two layers concrete fin is 3~6mm, and lamination waveform depth K is 1-5mm；The width T of each concrete fin is 10~15mm, and the wave orthogonal angle tan θ of concrete fin is within the scope of 1/3-1.The concrete structure makes x-y-z axis be owned by the waveform absorbent structure of uniform rule with 3D printing technique, and compared to traditional lamina structure, waveform special concrete can reduce multidirectional electromagnetic wave echo in all directions.
Description
Technical field
The present invention relates to technical field of concrete, and it is mixed to relate in particular to a kind of waveform electromagnetic wave absorption based on 3D printing
Xtah Crude Clay structure.
Background technique
Architectural grade 3D printing technique is increasingly developed, can utilize electromechanical integration technology, automatically layer by layer by cement-based material
It is printed as designed structure, is a kind of novel building technology.The technology is quick, flexible, high-efficient, in road, bridge, building etc.
Field development is significant.Due to the Technology design freedom degree is big, environmental pollution is small, speed of application is fast, it is high to build flexibility, manually at
This low, high degree of automation, the technology are widely popularized.Concrete 3D printing technique can by various solid cementitious materials,
The chemical addition agent of carbon material, metal material and liquid is used for the preparation of material, is conducive to material function, durability
Improve.
During World War II, people start the development for being related to electromagnetic-wave absorbent and application technology, and nowadays oneself obtains
To being widely applied.Electronic science and technology is quickly grown, and the application range of electromagnetic-wave absorbent also constantly expands, and is not only existed
Military field, it is also increasingly frequent in the application that information propagation, electromagnetic compatibility, microwave rate richness penetrate the civilian aspects such as protection.People grind
Numerous electromagnetic wave absorption materials is studied carefully, wherein absorbing carbon fiber wave material is the absorbing material studied and be most widely used at present
One of.However current absorbing carbon fiber wave material generallys use traditional Dallenbach structure, suction wavestrip width is limited, and mesh
Preceding research is based primarily upon laboratory facilities, and the lead time is long.Therefore, expansion suction wavestrip is wide and promotion suction wave reflection rate is current electricity
One major issue in magnetic wave material field.
Currently, the existing substantially planar hardened structure (single layer or multilayer) of electromagnetic wave absorption concrete, shortcoming exists
It is simple in space structure, electromagnetic wave absorption low efficiency, can not multiple reflections electromagnetic wave, the direct reflection of electromagnetic wave in surface is big, surface layer electricity
Magnetic wave-sucking performance is lower.
Summary of the invention
It is an object of the present invention to provide a kind of waveform electromagnetic wave absorption concrete structure based on 3D printing.The concrete
Structure makes x-y-z axis be owned by uniform regular waveform absorbent structure with 3D printing technique, compared to traditional list
Veneer structure, waveform special concrete can reduce multidirectional electromagnetic wave echo in all directions.
To achieve the above object, the technical scheme is that
A kind of waveform electromagnetic wave absorption concrete structure based on 3D printing, which is characterized in that the concrete structure is by one
Horizontal waveform concrete fin lamination accumulation layer by layer is constituted, and the lamination height D between adjacent two layers concrete fin is 3~6mm,
Lamination waveform depth K is 1-5mm；The width T of each concrete fin is 10~15mm, and the wave orthogonal angle tan θ of concrete fin exists
In range.
The preparation method of the above-mentioned waveform electromagnetic wave absorption concrete structure based on 3D printing, which is characterized in that the party
The step of method, is: 5-7min will can be stood in the electromagnetic wave absorption concrete pumping to the printing head of 3D printer of 3D printing, if
Setting printing head discharge area is 120-160mm2, extruded velocity 0.01-0.05m3/ h, horizontal direction print speed are 170-
190cm/min is vertically 0.7-0.9m/h to print speed；It is printed according to the above print parameters, obtains print structure body.
Compared with existing concrete material, the beneficial effects of the present invention are:
1 due to material and the electromagnetic parameter of air difference, wavy shaped configuration be more advantageous to promote electromagnetic space it is matched
Unbalance, outstanding this, which results in, to be penetrated the direction of concrete structure and changes, and the direction for changing surface electromagnetic wave reflection reduces
The electromagnetic wave of reflection may finally be effectively reduced by multiple variation in the electromagnetic wave received.
2, the wave structure of superficial layer makes the impedance of composite material be changed to continuity variation by original ladder-like mutation, has
Conducive to inhibiting electromagnetic wave to reflect due to caused by change in the instantaneous impedance, since the present invention can be formed in horizontal interface and vertical interface
The waveform of rule can cope with the Contamination of Electromagnetic Wave of any direction in conjunction with the electromagnetic wave absorption structure of stroke three-dimensional space.
3, multiple reflections and refraction occur between superficial layer solid and gap for incident electromagnetic wave, as shown, can increase
It is powered on the incident number and transmission range of magnetic wave, improves loss probability, there is also certain between multiple row back wave and refracted wave
Probability interferes loss, this is highly beneficial to the abundant incident and loss of electromagnetic wave especially oblique incidence electromagnetic wave, and portion
Divide electromagnetic wave to change its direction of propagation after multiple reflections and refraction, is no longer received equipment and is detected.(in 1-
In the frequency range of 18GHz, the frequency range that the present invention has more than 90% electro-magnetic wave absorption can achieve 17GHz, and create absorption
99.99% electromagnetic wave extreme value)
4.3D printing fast and flexible, high degree of automation, can zero error realize the preparation of its waveform complexity unified structure.
The shape wave structure based on 3D printing technique of the present patent application is due to special space structure, from vertical and horizontal plane
Two interfaces generate a large amount of regular waveform, can increase reflection of electromagnetic wave number, promote electromagnetic wave absorption material
Efficiency, extends the consumption path of electromagnetic wave, to more effectively reduce the electromagnetic wave of reflection.
With the lamination packed structures of 3D printing technique, the regular wave shape structure that depth is 2-5mm is vertically formed,
And concrete structure is printed to waveform absorbent structure (each wave wave of uniformly rule in the horizontal direction by graphic designs
It grows in 45mm-180mm, wave orthogonal angle tan θ is in 1/3-1, and compared to traditional lamina structure, waveform concrete can drop
Low multidirectional electromagnetic wave surface wave directly reflects, and can increase reflection of electromagnetic wave number, promote the effect of electromagnetic wave absorption material
Rate, extends the consumption path of electromagnetic wave, to more effectively reduce the electromagnetic wave of reflection.
Detailed description of the invention
Fig. 1 is that the present invention is based on a kind of overall structures of embodiment of waveform electromagnetic wave absorption concrete structure of 3D printing to show
It is intended to.
Fig. 2 is that the present invention is based on a kind of filling effect knots of embodiment of waveform electromagnetic wave absorption concrete structure of 3D printing
Structure schematic diagram.
Fig. 3 is to be locally filled with effective structure signal the present invention is based on the waveform electromagnetic wave absorption concrete structure of 3D printing
Figure.
Fig. 4 is that the present invention is based on a kind of side structures of embodiment of the waveform electromagnetic wave absorption concrete structure of 3D printing
Schematic diagram.
Fig. 5 is the concrete constructions effect picture of embodiment 1.
Fig. 6 is the concrete constructions effect picture of embodiment 2.
Fig. 7 is the concrete constructions effect picture of embodiment 3.
Fig. 8 is the concrete constructions effect picture of embodiment 4.
Fig. 9 is that the concrete of embodiment 1-2 carries out the effect picture of electromagnetic wave absorption evaluation test.
Figure 10 is that the concrete of embodiment 3-4 carries out the effect picture of electromagnetic wave absorption evaluation test.
Specific embodiment
The present invention is explained further below with reference to examples and drawings, but not in this, as to the application protection scope
It limits.
A kind of present invention waveform electromagnetic wave absorption concrete structure based on 3D printing, the concrete structure is by from level to level
Horizontal waveform concrete fin lamination accumulation is constituted, and the lamination height D between adjacent two layers concrete fin is 3~6mm, is laminated wave
Shape wave depth K is 1-5mm；The width T of each concrete fin is 10~15mm, and the wave orthogonal angle tan θ of concrete fin is in 1/3-1
In range；Horizontal wavy wavelength r is 45mm-180mm.
Concrete structure of the present invention not only forms waveform in x-y plane, also forms waveform in a z-direction, and x-y is flat
Waveform in face is to preset printing head due to 3D to move extruded concrete item row in the plane in the horizontal direction, 3D is beaten
Print can automate the concrete fin for printing width as 10mm-15mm, and concrete fin is printed with the shape of wave.
The waveform of z-axis is made of 3D printing laminar structure, is indicated with parameter concrete lamination height D and lamination waveform depth K.
In the vertical direction since the interlayer of 3D printing technique accumulates property, can form depth is 1mm-5mm, interfloor height 3mm-
The waveform of 6mm.Shown in design parameter Fig. 1-4.
The preparation method of the above-mentioned waveform electromagnetic wave absorption concrete structure based on 3D printing is, by can 3D printing electromagnetism
Wave absorption concrete is pumped in the printing head of 3D printer, stands 5-7min, and setting printing head discharge area is 120-
160mm2, extruded velocity 0.01-0.05m3/ h, horizontal direction print speed are 170-190cm/min, are vertically to print speed
0.7-0.9m/h.It is printed according to the above print parameters, obtains print structure body.
The application is built automatically by 3D printing technique, is greatly promoted the degree of automation, can not only be printed in horizontal interface
Waveform out, i.e., horizontal waveform, also forming depth in the vertical direction is 1mm-3mm, and interfloor height is the lamination of 3mm-6mm
Waveform.
Concrete structure of the present invention can individually print a face wall, can also beat using existing concrete surface as matrix
Print off waveform concrete structure.
It will be printed according to concrete structure row provided by the present invention, correlated performance test is carried out to the structural body after printing,
That is constructiveness evaluation, electromagnetic wave absorption performance evaluation, are printed after tested according to concrete structure of the present invention, according to above-mentioned system
Prepared by Preparation Method, can guarantee going on smoothly for print procedure under the premise of meeting proposed printing and requiring, and print
Resulting structures body is stablized solid afterwards.
Electromagnetic wave absorption reflectance test uses arch frame bounce technique, with vector network analyzer (Agilent N5232A) transmitting
Electromagnetic wave tests out the reflectivity of the electromagnetic wave absorption of material by the transmission of emitting head and reception head.Electromagnetic wave absorption of the present invention
It can test strictly reference National Military Standard " radar absorbing reflectivity test method " (GJB 2038-1994).Participate in electricity
The concrete of magnetic wave reflection rate test must be at least through 28 days standard curings (relative humidity 95 ± 5%, curing temperatures 20
±1℃).After maintenance, concrete test block is oven-dried in a low temperature of 60 DEG C, for reducing moisture content to reflection of electromagnetic wave rate
Influence.The smooth aluminum panel that upper 180mm*180mm is then padded below test block, is tested in the frequency range of 1-18GHz.
Embodiment 1:
The present embodiment is based in the waveform electromagnetic wave absorption concrete structure of 3D printing, and horizontal waveform highest point is to minimum
The distance H of point is 45mm, D 5.5mm, T 12mm, and K 2.5mm, Tan θ are 1, i.e. θ is 45 °.By concrete mortar pumping or
Machinery is delivered in the printing head of 3D printer, time of repose 5min, the time of repose refer to from concrete prepare to
The time between starting is printed, setting printing head discharge area is 120mm2, horizontal direction print speed is 175cm/min,
It is vertically 0.7m/h, extruded velocity 0.02m to print speed3Then/h is printed.
The present embodiment based on concrete in the waveform electromagnetic wave absorption concrete structure of 3D printing be can 3D printing copper furnace
Slag electromagnetic wave absorption concrete, according to parts by weight, the composition and content of concrete are respectively as follows:
42.5# rigid 7.0 parts of ordinary portland cement fastly；
7.0 parts of quartz sand；
1.70 parts of Cu-S ore；
0.8 part of silicon ash；
0.12 part of water-reducing agent；
0.3 part of brass powder；
0.1 part of red copper powder；
Length is 0.05 part of basalt fibre of 12mm；
Viscosity is 0.004 part of HPMC viscosity modifier of 50,000；
1.72 parts of water.
The specific surface area of the fast rigid ordinary portland cement is 348m2/kg, density 3.0g/cm3, normal consistency
Water consumption is 25.9%, presetting period 170min, final setting time 210min, loss on ignition 3.5%, and content of magnesia is
2.18%, 3 days flexural strengths are 5.7MPa, and 3 days compression strength is 30MPa.
The density of the silicon ash is 2.3g/cm3, specific surface area is 25~29m2/g；
The water-reducing agent is poly carboxylic acid series water reducer, and water-reducing rate is greater than 30%, solid content 36.5%；
The Cu-S ore density is 2.6g/cm3；Average grain diameter is 106 μm, and it is 53% that iron oxide is measured admittedly；
The brass powder average grain diameter is 60 μm, and D0.5 is 55 μm, and fine copper content is 93%；
The red copper powder average grain diameter is 65 μm, and D0.5 is 60 μm, and fine copper content is 98%.
The present embodiment can the preparation method of Cu-S ore electromagnetic wave absorption concrete of 3D printing be:
(1) according to parts by weight, above-mentioned raw materials are divided into four groups, first group be fast rigid 7.0 parts of ordinary portland cement,
1.70 parts of Cu-S ore, 7.0 parts of quartz sand, second group is 0.8 part and 0.05 part of basalt fibre of silicon ash, and third group is water-reducing agent
0.12 part, 0.3 part of brass powder, 0.1 part of red copper powder, the 4th group is 1.72 parts of water and 0.004 part of hydroxypropyl methyl cellulose；
(2) by first group of raw material, being sent into 30L horizontal type blender carries out mixing 100s, mixing speed 45 simultaneously
Rev/min, it is then corresponding again to be added to second group of raw material in the above-mentioned mixture being uniformly mixed simultaneously, then mixed
200s is stirred, mixing speed is 45 revs/min, until being mixed thoroughly；
(3) third group and the 4th group of raw material are first uniformly mixed respectively, then respectively by mixed third group material
It is added in the end of a period mixture that step (2) obtains, stirs 80s, the 4th group is admixed, it is described to get arriving to be stirred for 180s
Concrete.
Electromagnetic wave absorption performance evaluation:
The present embodiment is surveyed according to the requirement of " radar absorbing reflectivity test method " (GJB 2038-1994)
Examination.Test result is as shown in Fig. 9.Lower than -10dB bandwidth be 13GHz, it is meant that at least absorb 90% electromagnetic wave it is low
It is 9.5GHz in -20dB bandwidth, peak value is -44.6dB.
Embodiment 2:
As shown in fig. 6, the present embodiment is based in the waveform electromagnetic wave absorption concrete structure of 3D printing, H 45mm, D are
5mm, T 14mm, K 1.8mm, Tan θ are 2/3.Concrete pumping or machinery are delivered in the printing head of 3D printer,
Time of repose 7min, the time of repose refer to the time since being prepared to printing concrete, printing head are arranged
Discharge area is 150mm2, horizontal direction print speed is 170cm/min, is vertically 0.6m/h, extruded velocity to print speed
For 0.05m3/ h, is then printed.
The present embodiment based on concrete in the waveform electromagnetic wave absorption concrete structure of 3D printing be can 3D printing copper furnace
Slag electromagnetic wave absorption concrete, according to parts by weight, the composition and content of concrete are respectively as follows:
42.5# rigid 6.8 parts of ordinary portland cement fastly；
6.9 parts of quartz sand；
1.65 parts of Cu-S ore；
0.75 part of silicon ash；
0.14 part of water-reducing agent；
0.2 part of brass powder；
0.09 part of red copper powder；
Length is 0.06 part of basalt fibre of 12mm；
Viscosity is 0.004 part of HPMC viscosity modifier of 50,000；
1.70 parts of water.
The specific surface area of the fast rigid ordinary portland cement is 348m2/kg, density 3.0g/cm3, normal consistency
Water consumption is 25.9%, presetting period 170min, final setting time 210min, loss on ignition 3.5%, and content of magnesia is
2.18%, 3 days flexural strengths are 5.7MPa, and 3 days compression strength is 30MPa.
The density of the silicon ash is 2.3g/cm3, specific surface area is 25~29m2/g；
The water-reducing agent is poly carboxylic acid series water reducer, and water-reducing rate is greater than 30%, solid content 36.5%；
The Cu-S ore density is 2.6g/cm3；Average grain diameter is 106 μm, and it is 53% that iron oxide is measured admittedly；
The brass powder average grain diameter is 60 μm, and D0.5 is 55 μm, and fine copper content is 93%；
The red copper powder average grain diameter is 65 μm, and D0.5 is 60 μm, and fine copper content is 98%.
The present embodiment can the preparation method of Cu-S ore electromagnetic wave absorption concrete of 3D printing be:
(1) according to parts by weight, above-mentioned raw materials are divided into four groups, first group be fast rigid 6.8 parts of ordinary portland cement,
1.65 parts of Cu-S ore, 6.9 parts of quartz sand, second group is 0.75 part and 0.06 part of basalt fibre of silicon ash, and third group is water-reducing agent
0.14 part, 0.2 part of brass powder, 0.09 part of red copper powder, the 4th group is 1.70 parts of water and 0.004 part of hydroxypropyl methyl fiber
Element；
(2) by first group of raw material, being sent into 30L horizontal type blender carries out mixing 100s, mixing speed 45 simultaneously
Rev/min, it is then corresponding again to be added to second group of raw material in the above-mentioned mixture being uniformly mixed simultaneously, then mixed
200s is stirred, mixing speed is 45 revs/min, until being mixed thoroughly；
(3) third group and the 4th group of raw material are first uniformly mixed respectively, then respectively by mixed third group material
It is added in the end of a period mixture that step (2) obtains, stirs 80s, the 4th group is admixed, it is described to get arriving to be stirred for 180s
Concrete.
Electromagnetic wave absorption performance evaluation:
The present embodiment is surveyed according to the requirement of " radar absorbing reflectivity test method " (GJB 2038-1994)
Examination.Test result is as shown in Fig. 9.Lower than -10dB bandwidth be 17GHz, it is meant that at least absorb 90% electromagnetic wave it is low
It is 17GHz in -20dB bandwidth, peak value is -37dB.
Embodiment 3:
Control the Cu-S ore electromagnetic wave absorption concrete of 3D printing, H 90mm, D 5.2mm, T 15mm, K 2mm, Tan θ
It is 1/3.Concrete pumping or machinery are delivered in the printing head of 3D printer, time of repose 6min, the time of repose
Refer to the time since being prepared to printing concrete, setting printing head discharge area is 160mm2, horizontal direction
Print speed is 180cm/min, is vertically 0.6m/h, extruded velocity 0.02m to print speed3/ h, is then printed.
The present embodiment can 3D printing Cu-S ore electromagnetic wave absorption concrete according to parts by weight, the composition and content of concrete
It is respectively as follows:
42.5# rigid 7.1 parts of ordinary portland cement fastly；
7.1 parts of quartz sand；
1.75 parts of Cu-S ore；
0.85 part of silicon ash；
0.18 part of water-reducing agent；
0.4 part of brass powder；
0.11 part of red copper powder；
Length is 0.07 part of basalt fibre of 12mm；
Viscosity is 0.005 part of HPMC viscosity modifier of 50,000；
1.73 parts of water.
The specific surface area of the fast rigid ordinary portland cement is 348m2/ kg, density 3.0g/cm3, normal consistency use
Water is 25.9%, presetting period 170min, final setting time 210min, loss on ignition 3.5%, and content of magnesia is
2.18%, 3 days flexural strengths are 5.7MPa, and 3 days compression strength is 30MPa.
The density of the silicon ash is 2.3g/cm3, specific surface area is 25~29m2/g；
The water-reducing agent is poly carboxylic acid series water reducer, and water-reducing rate is greater than 30%, solid content 36.5%；
The Cu-S ore density is 2.6g/cm3；Average grain diameter is 106 μm, and it is 53% that iron oxide is measured admittedly；
The brass powder average grain diameter is 60 μm, and D0.5 is 55 μm, and fine copper content is 93%；
The red copper powder average grain diameter is 65 μm, and D0.5 is 60 μm, and fine copper content is 98%.
The present embodiment can the preparation method of Cu-S ore electromagnetic wave absorption concrete of 3D printing be:
(1) according to parts by weight, above-mentioned raw materials are divided into four groups, first group be fast rigid 7.1 parts of ordinary portland cement,
1.75 parts of Cu-S ore, 7.1 parts of quartz sand, second group is 0.85 part and 0.07 part of basalt fibre of silicon ash, and third group is water-reducing agent
0.18 part, 0.4 part of brass powder, 0.11 part of red copper powder, the 4th group is 1.73 parts of water and 0.005 part of hydroxypropyl methyl fiber
Element；
(2) by first group of raw material, being sent into 30L horizontal type blender carries out mixing 100s, mixing speed 45 simultaneously
Rev/min, it is then corresponding again to be added to second group of raw material in the above-mentioned mixture being uniformly mixed simultaneously, then mixed
200s is stirred, mixing speed is 45 revs/min, until being mixed thoroughly；
(3) third group and the 4th group of raw material are first uniformly mixed respectively, then respectively by mixed third group material
It is added in the end of a period mixture that step (2) obtains, stirs 80s, the 4th group is admixed, it is described to get arriving to be stirred for 180s
Concrete.
Electromagnetic wave absorption performance evaluation:
The present embodiment is surveyed according to the requirement of " radar absorbing reflectivity test method " (GJB 2038-1994)
Examination.Test result is as shown in Fig. 10.It is 16.8GHz lower than -10dB bandwidth, it is meant that at least absorb 90% electromagnetic wave
It is 9GHz lower than -20dB bandwidth, peak value is -28.3dB.
Embodiment 4:
The Cu-S ore electromagnetic wave absorption concrete H for controlling 3D printing is 180mm, D 4.5mm, T 13mm, K 2mm, Tan θ
It is 1, i.e. θ is 45 °.By concrete pumping or it is mechanical be delivered in the printing head of 3D printer, time of repose 6min is described quiet
Set the time refer to since concrete prepare to printing time, setting printing head discharge area be 190mm2,
Horizontal direction print speed is 185cm/min, is vertically 0.7m/h, extruded velocity 0.02m to print speed3Then/h is carried out
Printing.
The present embodiment can 3D printing Cu-S ore electromagnetic wave absorption concrete according to parts by weight, the composition and content of concrete
It is respectively as follows:
42.5# rigid 6.9 parts of ordinary portland cement fastly；
7.1 parts of quartz sand；
1.65 parts of Cu-S ore；
0.8 part of silicon ash；
0.21 part of water-reducing agent；
0.5 part of brass powder；
0.12 part of red copper powder；
Length is 0.06 part of basalt fibre of 12mm；
Viscosity is 0.003 part of HPMC viscosity modifier of 50,000；
1.74 parts of water.
The specific surface area of the fast rigid ordinary portland cement is 348m2/ kg, density 3.0g/cm3, normal consistency use
Water is 25.9%, presetting period 170min, final setting time 210min, loss on ignition 3.5%, and content of magnesia is
2.18%, 3 days flexural strengths are 5.7MPa, and 3 days compression strength is 30MPa.
The density of the silicon ash is 2.3g/cm3, specific surface area is 25~29m2/g；
The water-reducing agent is poly carboxylic acid series water reducer, and water-reducing rate is greater than 30%, solid content 36.5%；
The Cu-S ore density is 2.6g/cm3；Average grain diameter is 106 μm, and it is 53% that iron oxide is measured admittedly；
The brass powder average grain diameter is 60 μm, and D0.5 is 55 μm, and fine copper content is 93%；
The red copper powder average grain diameter is 65 μm, and D0.5 is 60 μm, and fine copper content is 98%.
The present embodiment can the preparation method of Cu-S ore electromagnetic wave absorption concrete of 3D printing be:
(1) according to parts by weight, above-mentioned raw materials are divided into four groups, first group be fast rigid 6.9 parts of ordinary portland cement,
1.65 parts of Cu-S ore, 7.1 parts of quartz sand, second group is 0.8 part and 0.06 part of basalt fibre of silicon ash, and third group is water-reducing agent
0.21 part, 0.5 part of brass powder, 0.12 part of red copper powder, the 4th group is 1.74 parts of water and 0.006 part of hydroxypropyl methyl fiber
Element；
(2) by first group of raw material, being sent into 30L horizontal type blender carries out mixing 100s, mixing speed 45 simultaneously
Rev/min, it is then corresponding again to be added to second group of raw material in the above-mentioned mixture being uniformly mixed simultaneously, then mixed
200s is stirred, mixing speed is 45 revs/min, until being mixed thoroughly；
(3) third group and the 4th group of raw material are first uniformly mixed respectively, then respectively by mixed third group material
It is added in the end of a period mixture that step (2) obtains, stirs 80s, the 4th group is admixed, it is described to get arriving to be stirred for 180s
Concrete.
Electromagnetic wave absorption performance evaluation:
The present embodiment is surveyed according to the requirement of " radar absorbing reflectivity test method " (GJB 2038-1994)
Examination.Test result is as shown in Fig. 10.It is 14.2GHz lower than -10dB bandwidth, it is meant that at least absorb 90% electromagnetic wave
It is 8.9GHz lower than -20dB bandwidth, peak value is -33.5dB.
Embodiment 5
The present embodiment based on the waveform electromagnetic wave absorption concrete structure of 3D printing with embodiment 1, the difference is that this
In embodiment concrete be can 3D printing concrete material.Using common 3D printing concrete according to the structure shape of the application
Formula, absorbing property can also be improved significantly.
The present invention does not address place and is suitable for the prior art.
Claims (3)
1. a kind of waveform electromagnetic wave absorption concrete structure based on 3D printing, which is characterized in that the concrete structure is by one layer
The horizontal waveform concrete fin lamination accumulation of layer is constituted, and the lamination height D between adjacent two layers concrete fin is 3~6mm, layer
Pressure waveform depth K is 1-5mm；The width T of each concrete fin is 10~15mm, and the wave orthogonal angle tan θ of concrete fin is 1/
Within the scope of 3-1.
2. a kind of preparation method of the waveform electromagnetic wave absorption concrete structure described in claim 1 based on 3D printing, special
The step of sign is, this method is: by can be quiet in the electromagnetic wave absorption concrete pumping to the printing head of 3D printer of 3D printing
5-7min is set, setting printing head discharge area is 120-160mm2, extruded velocity 0.01-0.05m3/ h, horizontal direction printing
Speed is 170-190cm/min, is vertically 0.7-0.9m/h to print speed；It is printed, is obtained according to the above print parameters
Print structure body.
3. preparation method according to claim 2, which is characterized in that it is described can 3D printing electromagnetic wave absorption concrete be can
The Cu-S ore electromagnetic wave absorption concrete of 3D printing.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116573901A (en) * | 2023-03-31 | 2023-08-11 | 重庆大学溧阳智慧城市研究院 | Directional steel fiber electromagnetic wave-absorbing concrete super structure based on 3D printing technology |
| CN116922532A (en) * | 2023-07-20 | 2023-10-24 | 重庆大学溧阳智慧城市研究院 | Electromagnetic wave-absorbing concrete multilayer 3D printing path planning method |
| CN117245758A (en) * | 2023-07-14 | 2023-12-19 | 重庆大学溧阳智慧城市研究院 | Preparation method and component of impedance gradient water-absorbent resin reinforced electromagnetic wave-absorbing concrete |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0383142A1 (en) * | 1989-02-15 | 1990-08-22 | Ytong Ag | Electromagnetic wave absorbing means and method of making it as well as its utilization |
| CN104628326A (en) * | 2015-02-16 | 2015-05-20 | 福建省盛威建设发展有限公司 | Concrete with electromagnetic wave radiation protection function and preparation method thereof |
| CN205319322U (en) * | 2015-09-25 | 2016-06-15 | 杭州思创汇联科技有限公司 | Foraminiferous wavy shield assembly of UHF |
| CN107056325A (en) * | 2017-03-28 | 2017-08-18 | 海南大学 | A kind of double-deck compromise face cement-based absorption material and preparation method thereof |
| CN108590187A (en) * | 2018-01-04 | 2018-09-28 | 河北工业大学 | A method of with high ductility toughening cement-based materials 3D printing concrete structure |
| CN108609947A (en) * | 2018-04-03 | 2018-10-02 | 河北工业大学 | Copper furnace slag electromagnetic wave-absorbing concrete capable of being printed in 3D mode and using method thereof |
| CN108966622A (en) * | 2018-08-10 | 2018-12-07 | 西安安聚德纳米科技有限公司 | A kind of ultra-wide incidence angle microwave absorbing material and preparation method thereof |
-
2019
- 2019-01-21 CN CN201910051846.0A patent/CN109516744B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0383142A1 (en) * | 1989-02-15 | 1990-08-22 | Ytong Ag | Electromagnetic wave absorbing means and method of making it as well as its utilization |
| CN104628326A (en) * | 2015-02-16 | 2015-05-20 | 福建省盛威建设发展有限公司 | Concrete with electromagnetic wave radiation protection function and preparation method thereof |
| CN205319322U (en) * | 2015-09-25 | 2016-06-15 | 杭州思创汇联科技有限公司 | Foraminiferous wavy shield assembly of UHF |
| CN107056325A (en) * | 2017-03-28 | 2017-08-18 | 海南大学 | A kind of double-deck compromise face cement-based absorption material and preparation method thereof |
| CN108590187A (en) * | 2018-01-04 | 2018-09-28 | 河北工业大学 | A method of with high ductility toughening cement-based materials 3D printing concrete structure |
| CN108609947A (en) * | 2018-04-03 | 2018-10-02 | 河北工业大学 | Copper furnace slag electromagnetic wave-absorbing concrete capable of being printed in 3D mode and using method thereof |
| CN108966622A (en) * | 2018-08-10 | 2018-12-07 | 西安安聚德纳米科技有限公司 | A kind of ultra-wide incidence angle microwave absorbing material and preparation method thereof |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116573901A (en) * | 2023-03-31 | 2023-08-11 | 重庆大学溧阳智慧城市研究院 | Directional steel fiber electromagnetic wave-absorbing concrete super structure based on 3D printing technology |
| CN116573901B (en) * | 2023-03-31 | 2023-12-05 | 重庆大学溧阳智慧城市研究院 | Directional steel fiber electromagnetic wave-absorbing concrete super structure based on 3D printing technology |
| CN117245758A (en) * | 2023-07-14 | 2023-12-19 | 重庆大学溧阳智慧城市研究院 | Preparation method and component of impedance gradient water-absorbent resin reinforced electromagnetic wave-absorbing concrete |
| CN117245758B (en) * | 2023-07-14 | 2024-04-05 | 重庆大学溧阳智慧城市研究院 | Preparation method and component of impedance gradient water-absorbent resin reinforced electromagnetic wave-absorbing concrete |
| CN116922532A (en) * | 2023-07-20 | 2023-10-24 | 重庆大学溧阳智慧城市研究院 | Electromagnetic wave-absorbing concrete multilayer 3D printing path planning method |
| CN116922532B (en) * | 2023-07-20 | 2024-04-16 | 重庆大学溧阳智慧城市研究院 | Electromagnetic wave-absorbing concrete multilayer 3D printing path planning method |
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