CN115028470A - Cement-based wave absorbing structure and preparation method thereof - Google Patents
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- 239000004568 cement Substances 0.000 title claims abstract description 83
- 238000002360 preparation method Methods 0.000 title claims abstract description 22
- 239000000463 material Substances 0.000 claims abstract description 51
- 239000010410 layer Substances 0.000 claims abstract description 41
- 239000002131 composite material Substances 0.000 claims abstract description 12
- 238000000034 method Methods 0.000 claims abstract description 12
- 238000011049 filling Methods 0.000 claims abstract description 9
- 238000009833 condensation Methods 0.000 claims abstract description 7
- 230000005494 condensation Effects 0.000 claims abstract description 7
- 239000002356 single layer Substances 0.000 claims abstract description 7
- 239000004743 Polypropylene Substances 0.000 claims description 20
- 239000006260 foam Substances 0.000 claims description 20
- -1 polypropylene Polymers 0.000 claims description 20
- 229920001155 polypropylene Polymers 0.000 claims description 20
- 239000006087 Silane Coupling Agent Substances 0.000 claims description 10
- 238000012423 maintenance Methods 0.000 claims description 9
- 238000002156 mixing Methods 0.000 claims description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- 239000002245 particle Substances 0.000 claims description 8
- 238000003756 stirring Methods 0.000 claims description 8
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 7
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 7
- 239000011398 Portland cement Substances 0.000 claims description 6
- 239000007787 solid Substances 0.000 claims description 6
- 239000002344 surface layer Substances 0.000 claims description 3
- 238000005498 polishing Methods 0.000 claims description 2
- 239000002994 raw material Substances 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims 1
- 239000011358 absorbing material Substances 0.000 abstract description 14
- 238000010521 absorption reaction Methods 0.000 abstract description 12
- 238000002310 reflectometry Methods 0.000 abstract description 11
- 239000011083 cement mortar Substances 0.000 abstract description 8
- 239000004566 building material Substances 0.000 abstract description 4
- 230000001105 regulatory effect Effects 0.000 abstract description 4
- 239000011230 binding agent Substances 0.000 abstract description 3
- 238000011031 large-scale manufacturing process Methods 0.000 abstract description 3
- 238000012360 testing method Methods 0.000 description 10
- 229910000831 Steel Inorganic materials 0.000 description 4
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- 239000006096 absorbing agent Substances 0.000 description 2
- 230000015271 coagulation Effects 0.000 description 2
- 238000005345 coagulation Methods 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000005192 partition Methods 0.000 description 2
- 235000019362 perlite Nutrition 0.000 description 2
- 239000010451 perlite Substances 0.000 description 2
- 230000002745 absorbent Effects 0.000 description 1
- 239000002250 absorbent Substances 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
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- 238000005520 cutting process Methods 0.000 description 1
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- 239000011229 interlayer Substances 0.000 description 1
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- 239000004570 mortar (masonry) Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229920006327 polystyrene foam Polymers 0.000 description 1
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Classifications
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00241—Physical properties of the materials not provided for elsewhere in C04B2111/00
- C04B2111/00258—Electromagnetic wave absorbing or shielding materials
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/40—Porous or lightweight materials
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A10/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE at coastal zones; at river basins
- Y02A10/11—Hard structures, e.g. dams, dykes or breakwaters
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
Abstract
The invention belongs to the field of functional building materials, and particularly relates to a cement-based wave-absorbing structure and a preparation method thereof. According to the invention, the EPP is doped into cement mortar, and the double-layer cement-based wave-absorbing structure with the concave-convex surface is prepared based on a single-layer condensation method by regulating the amount of a high-molecular binder and using vibration, so that the double-layer cement-based wave-absorbing structure has the advantages of wide absorption frequency band, high-efficiency absorption, easiness in preparation, low cost, good mechanical property and the like, wherein the bandwidth of a sample with the EPP total filling rate of 30 percent is 13.96GHz less than-10 dB in a frequency band of 2-18GHz, the average reflectivity is-14.08 dB, the breaking strength and the compressive strength are respectively 4.5MPa and 29.9MPa, the density is about 70 percent of that of a pure cement material, and the requirements of the current building wave-absorbing material are met in economical efficiency and practicability. The invention can be applied to scenes such as civil buildings, ground military targets, microwave darkrooms and the like in large-scale production, and has guiding significance for the application of the wave-absorbing and load-bearing integrated cement-based composite material.
Description
Technical Field
The invention belongs to the field of functional building materials, and particularly relates to a cement-based wave-absorbing structure and a preparation method thereof.
Background
The cement is the most main building material in the field of engineering construction, is also the main base material of the wave-absorbing material for buildings, and has excellent mechanical property, simple preparation process and certain wave-absorbing property. However, the cement material has the disadvantages of narrow bandwidth and poor wave-absorbing performance due to poor impedance matching of the cement material.
The cement is subjected to doping modification and structural design at home and abroad to improve the impedance matching characteristic so as to improve the wave-absorbing performance of the cement-based material. Although the mechanical strength of the cement-based wave-absorbing material is greatly improved, the cement-based wave-absorbing material is still insufficient to be used as a building structure material, and therefore, the cement-based wave-absorbing material is often used as a wall surface material and a partition material of a building. For example, cement is mixed with porous aggregate represented by expanded polystyrene, expanded perlite and hollow glass micropowder to form the cement-based wave-absorbing material with a double-layer and porous structure.
Among them, the improvement of the wave absorption performance of the material is most obvious when the expanded polystyrene is doped. In patent CN101042005, 60 vol% EPS and carbon black are uniformly filled in cement mortar, and a layered coagulation method is adopted to prepare a double-layer cement-based material containing a matching layer and a loss layer, wherein the reflectivity is almost all lower than-10 dB within 2-18 GHz. Similarly, the patent CN105016676A prepares a double-layer cement-based material containing an impedance matching layer and a loss layer by respectively doping expanded perlite and a wave absorbing agent in cement mortar, and the bandwidth of less than-14 dB in 8-18GHz is about 7.3GHz, but the method has higher cost and complex preparation process, thereby being difficult to adapt to the characteristic of huge consumption of building materials.
Secondly, cement mortar can be poured into a mould with a special-shaped structure to obtain the cement-based wave-absorbing material with the special-shaped surface. The patent CN107056325A is that polystyrene foam and wave absorbing agent are mixed in cement mortar, and the prepared mixed slurry is poured into a special mould to obtain the cement-based wave absorbing material with a special-shaped structure (comprising a triangle, a sine curve, a semicircle and a right-angle groove), and tests show that the effective bandwidth with the reflectivity of less than-10 dB can reach 14GHz within 1.7-18GHz, but the surface special-shaped structure formed by the method is easy to damage, the mechanical property of the material is poor, and a special mould is needed, and the preparation process is complicated, so the application in practical engineering is difficult.
In summary, the existing preparation method of the cement-based wave-absorbing material generally has the defects of complex preparation process, poor mechanical property, high cost and the like. Accordingly, a cement-based wave-absorbing structure with wide frequency band, low cost and high strength needs to be developed.
Disclosure of Invention
Aiming at the problems or the defects, the invention provides a cement-based wave-absorbing structure and a preparation method thereof in order to improve the preparation technology of the existing cement-based wave-absorbing material.
A cement-based wave-absorbing structure is a double-layer structure with a concave-convex surface, wherein the upper layer is a matching layer taking polypropylene foam as a main filling material, and the lower layer is a cement layer taking cement as a main filling material; the thickness of the matching layer accounts for 10-30% of the total thickness of the material; the preparation method is characterized by adopting a single-layer condensation method and comprising the following raw materials in parts by weight: 10-30 parts of a silane coupling agent, 1-3 parts of polypropylene foam, 10-30 parts of a polyvinyl alcohol solution with the solid content of 20-30%, 350-450 parts of water and 1050-1350 parts of composite portland cement. The cement-based wave-absorbing structure provided by the invention has the advantages of wide absorption frequency band, high absorption efficiency and high mechanical strength.
Further, the particle size of the polypropylene foam is 3-5 mm. When the particle size is less than 3mm, the absorption bandwidth is narrowed, and the wave-absorbing performance is deteriorated; when the particle diameter is larger than 5mm, the problem of difficulty in molding the material is encountered.
The preparation method of the cement-based wave-absorbing structure comprises the following specific steps:
step 1, adding 10-30 parts by mass of a silane coupling agent into 1-3 parts by mass of polypropylene foam (the particle size is 3-5 mm), stirring at room temperature until the polypropylene foam is fully wetted by the silane coupling agent, then adding 10-30 parts by mass of a polyvinyl alcohol solution with the solid content of 20-30%, and uniformly mixing at room temperature to obtain a component A.
And 2, adding 350-450 parts of water to 1050-1350 parts of composite portland cement by mass, and uniformly stirring to obtain a component B.
And 3, adding the component A prepared in the step 1 into the component B prepared in the step 2, and uniformly mixing to obtain the cement wave-absorbing base material, wherein the mass of each part in the step 1 is consistent with that in the step 2.
And 4, pouring the cement wave-absorbing base material prepared in the step 3 into a mould, and then vibrating the cement wave-absorbing base material until one half of the polypropylene foam particles with the surface layer of 60-80% float on the surface of the cement. And if the vibration duration is too short, the layering of the polypropylene foam EPP in the integral cement wave-absorbing base material is not obvious, so that the wave-absorbing performance is influenced, and if the vibration duration is too long, the upper-layer cement is completely settled to the lower layer, so that the mechanical property of the integral structure is influenced.
And 5, demolding the cement wave-absorbing base material vibrated in the step 4 at normal temperature, and finishing maintenance to obtain the cement-based wave-absorbing structure with the double-layer structure with the concave-convex surface.
The maintenance time lasts 21 d-28 d, the maintenance mode is watering natural maintenance, and the cement base is required to be kept wet in the period; during the curing period, the exposure time of the material surface is also reduced as much as possible, and the exposed surface of the material is covered tightly (the material can be covered by tarpaulin, plastic cloth and the like) in time to prevent the water on the surface from evaporating.
Furthermore, the surface of the cured broadband, efficient and high-strength cement-based wave-absorbing structure is polished to avoid the cutting and stabbing injuries caused by direct contact of a human body, improve the attractiveness of the cement-based wave-absorbing structure and avoid influence on wave-absorbing performance.
The invention adopts a single-layer preparation method based on vibration and a high-molecular adhesive, and the mechanical property of the prepared concave-convex surface double-layer cement-based wave-absorbing structure is superior to that of the existing double-layer cement-based wave-absorbing material prepared by a layered condensation method under the similar wave-absorbing property. In the cement-based wave-absorbing structure prepared by the invention, polypropylene foam is used as a matching layer of a main filling material, and cement is used as a cement layer of the main filling material; based on the characteristics of low density and poor affinity with cement mortar of the polypropylene foam EPP, the volume fraction of the EPP in the matching layer and the thickness of the matching layer are regulated and controlled by controlling the EPP doping amount, the polyvinyl alcohol solution doping amount and the vibration duration, and the concave-convex surface and the double-layer structure of the wave-absorbing structure are formed.
The reason for improving the wave absorbing performance is as follows: the volume fraction of the EPP porous medium in the matching layer obtained by the preparation method is obviously higher than that of a layered condensation method, so that the reflection loss caused by impedance matching unbalance is weakened, and the electromagnetic wave can enter the material to a large extent; while the porous structure therein may cause scattering and refraction of the electromagnetic waves, which in turn reduces the normal reflectivity. And secondly, the surface layer also forms a concave-convex surface, which is more beneficial to incidence, scattering and refraction of electromagnetic waves, and then reduces the normal reflectivity.
The cement layer is mainly responsible for providing mechanical properties, and can be used as a wall material and a partition material of a building although the strength of the material is not enough to be used as a structural material of the building. The reasons for the improvement of mechanical properties are: the thickness of the matching layer accounts for 10-30% of the total thickness of the material, and the deterioration of the mechanical property of the matching layer under the thickness is relatively small; and because the invention adopts a single-layer coagulation method, the interlayer bonding force of the matching layer and the cement layer is stronger.
In conclusion, the invention provides a double-layer cement-based wave-absorbing structure with a concave-convex surface, which is prepared by mixing polypropylene foam (EPP) with better mechanical property and environmental stability into cement mortar, regulating the amount of a high-molecular binder and using a vibration mode and based on a single-layer condensation method. Based on the electromagnetic loss characteristic of cement and the good impedance matching characteristic after modification, the composite material has the advantages of wide absorption frequency band, high-efficiency absorption, easiness in preparation, low cost, good mechanical property and the like, wherein the bandwidth of a sample with the EPP total filling rate of 30 percent is lower than-10 dB and is 13.96GHz within the frequency band of 2-18GHz, the average reflectivity is-14.08 dB, the flexural strength and the compressive strength are respectively 4.5MPa and 29.9MPa, and the density is about 70 percent of that of a pure cement material. The requirements of the current wave-absorbing material for buildings are met in the aspects of economy and practicability. The invention can be applied to scenes such as civil buildings, ground military targets, microwave darkrooms and the like in large-scale production, and has guiding significance for the application of the wave-absorbing and load-bearing integrated cement-based composite material.
Drawings
FIG. 1 is a flow chart of the preparation of the present invention.
Fig. 2 is a reflectivity curve diagram of the cement-based wave-absorbing structures prepared in examples 1 and 2.
Figure 3 is a top view of the cement-based wave-absorbing structure of example 2.
Figure 4 is a schematic cross-sectional view of a cement-based absorbent structure of the present invention.
Detailed Description
The present invention will be described in further detail below with reference to examples and drawings, but the present invention is not limited to the following examples.
In this embodiment: stirring the mixture of the component A and the component B by using a mortar stirrer, maintaining the prepared sample plate by using a watering maintenance method, testing the reflectivity of the sample plate by using a vector network analyzer, and testing the mechanical property of the cement-based wave-absorbing material by using a pressure tester according to the standard of GB/T17671-
Example 1:
a preparation method of a broadband, efficient and high-strength cement-based wave-absorbing structure comprises the following steps:
step 1, counting according to parts by mass: adding 10 parts of silane coupling agent into 1 part of polypropylene foam, stirring at room temperature until the polypropylene foam is fully wetted by the silane coupling agent, then adding 10 parts of polyvinyl alcohol solution with the solid content of 25%, and uniformly mixing at room temperature to obtain the component A.
And 3, adding the component A prepared in the step 1 into the component B prepared in the step 2, and uniformly mixing to obtain the cement wave-absorbing base material.
And 4, pouring the cement wave-absorbing base material prepared in the step 3 into a steel mould with the thickness of 200mm multiplied by 30mm, and then placing the mould on a vibration table to vibrate for 3 min.
And 5, placing the steel die in the step 4 at normal temperature for 24 hours for initial setting, then demolding, and then maintaining the sample for 28 days. The curing mode is watering natural curing, and the cement base needs to be kept moist in the period. During the maintenance of the sample, the exposure time of the material surface is also reduced as much as possible, and the exposed surface of the material is covered tightly (the material can be covered by tarpaulin, plastic cloth and the like) in time to prevent the water on the surface from evaporating.
The sample prepared in the embodiment 1 is tested for the wave absorption performance within the frequency band of 2-18GHz, and the test result is shown in FIG. 2, wherein the average reflectivity is-11.95 dB, and the effective bandwidth is 11.16 GHz. In addition, the test specimens were also prepared to have a compressive strength of 45.65 MPa.
Example 2:
step 1, calculating according to parts by mass: and adding 30 parts of silane coupling agent into 3 parts of polypropylene foam, stirring at room temperature until the polypropylene foam is fully wetted by the silane coupling agent, then adding 30 parts of polyvinyl alcohol solution with the solid content of 25%, and uniformly mixing at room temperature to obtain the component A.
And 2, counting by mass parts, wherein the mass of each part is consistent with that of the step 1. 350 parts of water is added to 1050 parts of composite Portland cement, and then the mixture is uniformly stirred to obtain a component B.
And 3, adding the component A prepared in the step 1 into the component B prepared in the step 2, and uniformly mixing to obtain the cement wave-absorbing base material.
And 4, pouring the cement wave-absorbing base material prepared in the step 3 into a steel mould with the thickness of 200mm multiplied by 30mm, and then placing the mould on a vibration table to vibrate for 3 min.
And 5, placing the steel mould in the step 4 at the normal temperature for 24 hours, initially solidifying, then demoulding, and then maintaining the sample for 28 days. The curing mode is watering natural curing, and the cement base needs to be kept moist in the period. During the maintenance of the test sample, the exposure time of the material surface is also reduced as much as possible, and the exposed surface of the material is covered tightly (the material surface can be covered by tarpaulin, plastic cloth and the like) in time to prevent the water on the surface from evaporating.
And 6, roughly polishing the upper surface of the sample obtained in the step 5 to finally obtain the broadband, efficient and high-strength cement-based wave-absorbing structure with the concave surface and the double-layer structure.
The sample prepared in the embodiment 2 is tested for the wave absorption performance within the frequency band of 2-18GHz, and the test result is shown in FIG. 2, wherein the average reflectivity is-13.96 dB, and the effective bandwidth (i.e. the frequency band less than-10 dB) is 14.08 GHz. In addition, the test piece was also subjected to a test of compressive strength, which was 29.97 MPa.
According to the embodiment and the corresponding test data, EPP with good mechanical property and environmental stability is doped in cement mortar, and the double-layer cement-based wave-absorbing structure with the concave-convex surface is prepared by regulating the amount of the high-molecular binder and using a vibration mode based on a single-layer condensation method. Based on the electromagnetic loss characteristic of cement and the good impedance matching characteristic after modification, the composite material has the advantages of wide absorption frequency band, high-efficiency absorption, easiness in preparation, low cost, good mechanical property and the like. Wherein the bandwidth of the sample with the EPP total filling rate of 30 percent lower than-10 dB in a frequency band of 2-18GHz is 13.96GHz, the average reflectivity is-14.08 dB, the flexural strength and the compressive strength are respectively 4.5MPa and 29.9MPa, and the density is about 70 percent of that of a pure cement material. The requirements of the current wave-absorbing material for buildings are met in the aspects of economy and practicability. The invention can be applied to scenes such as civil buildings, ground military targets, microwave darkrooms and the like in large-scale production, and has guiding significance for the application of the wave-absorbing and load-bearing integrated cement-based composite material.
Claims (4)
1. A cement-based wave-absorbing structure is characterized in that:
the cement-based composite material is of a double-layer structure with a concave-convex surface, the upper layer is a matching layer taking polypropylene foam as a main filling material, and the lower layer is a cement layer taking cement as a main filling material; the thickness of the matching layer accounts for 10-30% of the total thickness of the material;
the preparation method is characterized by adopting a single-layer condensation method and comprising the following raw materials in parts by weight: 10-30 parts of a silane coupling agent, 1-3 parts of polypropylene foam, 10-30 parts of a polyvinyl alcohol solution with the solid content of 20-30%, 350-450 parts of water and 1050-1350 parts of composite portland cement.
2. The cement-based wave absorbing structure of claim 1, wherein: the particle size of the polypropylene foam is 3-5 mm.
3. The preparation method of the cement-based wave-absorbing structure according to claim 1, comprising the following steps:
step 1, adding 10-30 parts by mass of a silane coupling agent into 1-3 parts by mass of polypropylene foam with a particle size of 3-5mm, stirring at room temperature until the polypropylene foam is fully wetted by the silane coupling agent, adding 10-30 parts by mass of a polyvinyl alcohol solution with a solid content of 20-30%, and uniformly mixing at room temperature to obtain a component A;
step 2, adding 350-450 parts of water to 1050-1350 parts of composite portland cement by mass, and then uniformly stirring to obtain a component B;
step 3, adding the component A prepared in the step 1 into the component B prepared in the step 2, and uniformly mixing to obtain a cement wave-absorbing base material;
step 4, pouring the cement wave-absorbing base material prepared in the step 3 into a mould, and then vibrating the cement wave-absorbing base material until one half of the polypropylene foam particles with the surface layer of 60-80% float on the surface of the cement;
and 5, demolding the cement wave-absorbing base material vibrated in the step 4 at normal temperature, and finishing maintenance to obtain the cement-based wave-absorbing structure with the double-layer structure with the concave-convex surface.
4. A method of making a cement-based wave-absorbing structure according to claim 3, characterized in that: the cement-based wave-absorbing structure after maintenance further comprises a surface polishing step.
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