CN113666697A - Wave-absorbing concrete and preparation method and application thereof - Google Patents
Wave-absorbing concrete and preparation method and application thereof Download PDFInfo
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- CN113666697A CN113666697A CN202111087183.1A CN202111087183A CN113666697A CN 113666697 A CN113666697 A CN 113666697A CN 202111087183 A CN202111087183 A CN 202111087183A CN 113666697 A CN113666697 A CN 113666697A
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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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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00241—Physical properties of the materials not provided for elsewhere in C04B2111/00
- C04B2111/00258—Electromagnetic wave absorbing or shielding materials
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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Abstract
The invention relates to the field of wave-absorbing materials, in particular to wave-absorbing concrete and a preparation method and application thereof. The wave-absorbing concrete contains cement, iron scale, broken stone, cellulose ether, water and a water reducing agent. The mass percentage of the iron scale in the wave-absorbing concrete is 22-32%, preferably 24-30%. The wave-absorbing concrete has good wave-absorbing performance and good mechanical property, does not generate oxidation reactions such as rust and the like, and has low material use cost and simple preparation method.
Description
Technical Field
The invention relates to the field of wave-absorbing materials, in particular to wave-absorbing concrete and a preparation method and application thereof.
Background
At present, the electromagnetic safety threat is increasingly severe, the cement-based electromagnetic shielding material can be adopted to carry out electromagnetic safety protection treatment on a specific building, the hidden danger of information leakage can be effectively solved, and the electromagnetic information safety of the building is protected.
In recent years, a great deal of research has been conducted at home and abroad on building shielding materials, and the main scope of the research is to shield or shield electromagnetic waves. The main research results of the existing electromagnetic shielding cement concrete comprise: doping fine carbon filaments into cement; the colloidal graphite is mixed into the cement; mixing coke powder into cement; the stainless steel fiber is mixed into the cement; short carbon fibers and graphite are added to the concrete. However, the traditional research has great problems, such as the addition of wave-absorbing or shielding functional materials can cause the reduction of the material strength, the addition of metal materials can generate oxidation reactions such as corrosion and the like on the surface along with the increase of time, the electromagnetic performance of the metal materials is influenced, and the parameters such as the strength, the toughness and the like of the whole material are further influenced, so that the uncertainty of the material is increased. Meanwhile, the building shielding material has a certain shielding effect on electromagnetic waves within the range of 10kHz to 2GHz, but the whole effect is poor, so that the building shielding material cannot meet the requirements of related national standards or national military standards and cannot meet the requirements of electromagnetic information safety of buildings.
In view of this, the invention is particularly proposed.
Disclosure of Invention
The invention aims to provide wave-absorbing concrete.
The second invention aims to provide a preparation method of the wave-absorbing concrete.
The third invention aims to provide application of the wave-absorbing concrete.
In order to achieve the purpose of the invention, the technical scheme is as follows:
the invention provides wave-absorbing concrete which contains cement, iron scale, broken stone, cellulose ether, water and a water reducing agent.
Optionally, the average grain size of the iron scale is 60-80 meshes, and the oxidation rate is more than 95%.
Optionally, the mass percentage of the iron scale in the wave-absorbing concrete is 22-32%, and preferably 24-30%.
Optionally, the cement is 425 cement, and preferably, the cement accounts for 23-24% of the wave-absorbing concrete by mass.
Optionally, the crushed stone comprises crushed stone of 5-10 mm and crushed stone of 10-20 mm;
preferably, the mass percentage of the crushed stone with the thickness of 5-10 mm in the wave-absorbing concrete is 15-20%;
more preferably, the broken stone with the thickness of 10-20 mm accounts for 20-25% of the wave-absorbing concrete by mass percent.
Optionally, the cellulose ether accounts for 0.01-0.1% of the wave-absorbing concrete by mass, and preferably accounts for 0.02%.
Optionally, the water accounts for 8-12% of the wave-absorbing concrete by mass, and preferably accounts for 10%.
Optionally, the water reducing agent accounts for 0.1-0.5% of the wave-absorbing concrete by mass, and preferably accounts for 0.2%.
The invention also provides a preparation method of the wave-absorbing concrete, which comprises the steps of adding the iron scale water reducing agent into cement and broken stone for mixing, then adding the cellulose ether into a stirrer for uniformly stirring, finally adding water and stirring for 1-5 minutes to obtain the wave-absorbing concrete.
The invention further provides application of the wave-absorbing concrete in shielding electromagnetic waves, and preferably, the thickness of the wave-absorbing concrete is 30-50 mm.
The invention has at least the following beneficial effects:
the wave-absorbing concrete has good wave-absorbing performance, does not generate oxidation reactions such as rust and the like, has good mechanical property, low material cost and simple preparation method; in the preferred technical scheme, the wave-absorbing concrete has good mechanical properties.
Drawings
FIG. 1 is a flow chart of a preparation process of wave-absorbing concrete according to an embodiment of the invention;
FIG. 2 shows the reflectivity test data of 8-18 GHz of sample block of example 1 with thickness of 30 mm;
FIG. 3 shows the reflectivity test data of 8-18 GHz for sample blocks of example 1 with a thickness of 50 mm;
FIG. 4 shows the reflectivity test data of 4-8 GHz for the sample block of example 1 with a thickness of 50 mm;
FIG. 5 shows the reflectivity test data of sample blocks of example 2 with a thickness of 30mm at 8-18 GHz;
FIG. 6 shows the reflectivity test data of sample block 8-18 GHz of comparative example 1 with thickness of 30 mm;
FIG. 7 shows the reflectivity test data of sample blocks of comparative example 2 with a thickness of 30mm at 8-18 GHz;
FIG. 8 is a photograph of the sample after mechanical testing for 28d (sample block indicated with 1)#、2#、3#、4#Respectively for sample 1, sample 2, sample 3 and sample 4).
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms also include the plural forms unless the context clearly dictates otherwise, and further, it is understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of the stated features, steps, operations, devices, components, and/or combinations thereof.
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In order to enable the concrete to have certain wave-absorbing performance (within the range of 2-18 GHz, the frequency bandwidth with reflection attenuation larger than 10dB is larger than 4GHz), the embodiment of the invention carries out deep research on the wave-absorbing material, and finally discovers that the wave-absorbing performance is optimal after the iron scale is added.
The iron scale is a product in the steel rolling industry, generally in a sheet shape or a powder shape, and the main component is iron oxide, so that the iron content is high and the water content is low. The iron scale can replace sand in common concrete, simplify the components of the concrete, increase the strength of the concrete, and prevent oxidation reactions such as rust, thereby completing the invention. The iron scale adopted in the embodiment of the invention is mainly in a sheet-shaped granular shape, the average grain diameter is 60-80 meshes, and the oxidation rate is more than 95%.
The wave-absorbing concrete provided by the embodiment of the invention can be prepared by taking the existing type of concrete as a foundation and adding a certain proportion of iron oxide scale. In the concrete material, the iron scale is added as an electromagnetic wave absorption material on the basis of sand, cement and a water reducing agent, and the iron scale is greatly different from common building sand, and specifically comprises the following steps: 1) the density of the iron scale is high, the integral dispersion is difficult, and the layering is easy to form, so that the material is not uniform; 2) the fluidity of the iron oxide scale is poor, and the negative influence on the concrete construction after the wave-absorbing material is added needs to be considered. Therefore, in order to enable the wave-absorbing material to have better dispersibility, fluidity and compressive strength, the embodiment of the invention further intensively researches the formula and the preparation process of the wave-absorbing concrete.
After intensive research on the addition amount of the iron scale, the mass percentage of the iron scale in the wave-absorbing concrete is 22-32%, preferably 24-30%. If the addition amount of the iron scale is too low, the wave absorbing performance cannot meet the requirements, and if the addition amount of the iron scale is too high, the fluidity of concrete is deteriorated, the integral dispersion is difficult, layering is easy to form, the material is uneven, and the mechanical performance of cement is affected.
Specifically, in the embodiment of the invention, concrete with the strength of C30 can be used as a base, and iron scale is added to prepare the wave-absorbing material. In particular, the cement may be selected from 425 cements. Preferably, the 425 cement accounts for 23-24% of the wave-absorbing concrete by mass percent.
Specifically, the crushed stone in the embodiment of the invention comprises 5-10 mm crushed stone and 10-20 mm crushed stone; the mass percentage of the broken stone with the thickness of 5-10 mm in the wave-absorbing concrete is 15-20%; the broken stone with the thickness of 10-20 mm accounts for 20-25% of the wave-absorbing concrete by mass percent. The broken stone with the proportion can be matched with the iron scale, so that the mechanical property and the fluidity of the concrete are further improved.
Further optionally, the cellulose ether in the embodiment of the invention accounts for 0.01-0.1% of the wave-absorbing concrete by mass, and preferably accounts for 0.02%. Because the granularity of the iron oxide scale is small, the specific surface area is large, and the layering effect is poor. Therefore, the embodiment of the invention finds that the addition of a small amount of cellulose ether in concrete increases the cohesion of the whole material, thereby overcoming the defects. However, if the amount of the cellulose ether added is too large, the viscosity of the mixture during the preparation process is too high, resulting in a decrease in fluidity, resulting in the formation of voids in the concrete and a decrease in mechanical properties.
Further optionally, the water accounts for 8-12% of the wave-absorbing concrete by mass, and preferably 10% of the wave-absorbing concrete by mass.
Further optionally, the water reducing agent in the embodiment of the invention accounts for 0.1-0.5% of the wave-absorbing concrete by mass, the concrete has good fluidity at the ratio, and the content of the water reducing agent is further preferably 0.2% in order to further improve the layered segregation phenomenon.
According to the embodiment of the invention, the wave-absorbing material is adopted to completely replace sand, meanwhile, the influence of the water reducing agent and the cellulose ether on the overall dispersibility and flowability is tested, and as the broken stone aggregate in the concrete is not changed, the compressive strength does not fluctuate greatly under the condition of good dispersibility and flowability. Therefore, the wave-absorbing concrete provided by the embodiment of the invention has compressive strength close to that of the conventional concrete.
The embodiment of the invention also relates to a preparation method of the wave-absorbing concrete, which comprises the steps of adding a scale water reducing agent into cement and broken stone for mixing, then adding cellulose ether into a stirrer for uniformly stirring, finally adding water into the mixture for stirring for 1-5 minutes to obtain the wave-absorbing concrete. The flow chart is shown in fig. 1.
The embodiment of the invention also relates to the application of the wave-absorbing concrete in shielding electromagnetic waves, preferably, the thickness of the wave-absorbing concrete is 30-50 mm, and when the thickness of the wave-absorbing concrete is within the range, a better wave-absorbing effect can be achieved.
Example 1
The formula of the wave-absorbing concrete is shown in table 1:
TABLE 1
Firstly, in order to evaluate the wave absorbing performance, a shielding effectiveness test sample block of 600mm × 600mm × 30mm is prepared, and the shielding effectiveness is tested according to the shielding chamber method in GJB6190-2008, and the test results are shown in Table 2.
TABLE 2
| Frequency (Hz) | 3G | 6G | 10G |
| Shielding effectiveness (dB) | 17 | 46 | 57 |
According to the test result, the shielding effectiveness is greatly increased along with the increase of the frequency, and because the shielding effectiveness is formed by the reflection and the absorption of the sample block to the electromagnetic wave, the surface resistance of the sample block is large (80-120M omega), and the reflection capability to the electromagnetic wave is limited, the absorption of the concrete sample block to the electromagnetic wave along with the increase of the frequency can be judged laterally through the test of the shielding effectiveness.
Secondly, in order to further evaluate the wave absorbing performance of the sample block, a concrete sample block of 180mm × 180mm × 30mm is prepared according to the requirements of GJB2038-2011, the reflection attenuation of 8-18 GHz is tested according to the requirements of the bow method, the test result is shown in Table 3, and the reflection measurement curve is shown in FIG. 2.
TABLE 3
The experimental results show that the novel concrete sample block has good reflection attenuation, but the attenuation bandwidth of more than 10dB is less than 4 GHz.
And thirdly, preparing a concrete sample block of 180mm multiplied by 50mm according to the requirements of GJB2038-2011, testing the reflection attenuation of 8-18 GHz according to the requirements of an arch method, wherein the test result is shown in Table 4, and the reflection measurement curve is shown in FIG. 3.
TABLE 4
It can be seen that the absorption of the sample block to electromagnetic waves is increased along with the increase of the thickness of the sample block, and the reflection attenuation of the sample block to the electromagnetic waves is larger than 10dB within the range of 8-18 GHz, so that the requirements of the project are completely met.
And (IV) in order to better verify the wave absorbing performance, the absorption attenuation of the concrete sample block with the thickness of 50mm to the electromagnetic waves within the range of 4-8 GHz is tested, the test result is shown in table 5, and the reflection measurement curve is shown in fig. 4.
TABLE 5
Comparing fig. 3 and fig. 4, it can be found that the two curves can be well fitted together (the absorption attenuation of 8GHz is-11.69 dB and-11.09 dB respectively, and the difference is only 0.6dB), and it is proved that the concrete material has a certain absorption capacity for electromagnetic waves of 4-18 GHz.
(IV) cost estimates for example 1 are shown in Table 6.
TABLE 6
It can be seen that the cost per ton is about 850 yuan, and the density of the concrete with the formula is about 2.5g/cm after the concrete is mixed with water3Therefore, the cost of one concrete is about 2125 yuan, although the cost is higher than that of the common concrete material, the increase range is still in a controllable range, and the concrete can be completely popularized and used in some key projects.
Example 2
Formula of the wave-absorbing concrete the formula of the wave-absorbing concrete is shown in table 7.
TABLE 7
And a sample with the thickness of 30mm is prepared for testing the reflectivity, the reflection attenuation of 8-18 GHz is tested according to the requirements of the bow method, the test result is shown in Table 8, and the reflection measurement curve is shown in FIG. 5.
TABLE 8
Comparing the reflectivity tests of the two samples of example 1 and example 2, it was found that the reflectivity attenuation did not increase as expected, but instead the reflection attenuation was greatly reduced, which may be related to the changes in the permeability and permittivity of the samples, resulting in a reduced matching of the samples to the electromagnetic waves, and therefore a large portion of the electromagnetic waves were reflected.
Example 3 addition test of Water reducing agent
The water reducing agent is tested by selecting two mixing amounts of 0.2% and 0.4%, the raw materials are uniformly mixed, water is added and stirred for 1min, the fluidity of concrete is better under the two mixing amounts, but the mixing amount of 0.4% has a certain layering segregation phenomenon, and the distribution of broken stones, iron scales and the like at the bottom is obviously higher than that of upper slurry.
In order to reduce the segregation of the concrete, in the subsequent tests, 0.2% of the water reducing agent addition was chosen and a certain amount of cellulose ether was added to increase the overall viscosity.
Example 4 addition test of cellulose ether
The addition amounts of 0.02% and 0.04% are selected for testing, after the slurry is prepared, the viscosity of the slurry is increased to a certain degree, the scale can be effectively dispersed, and the viscosity of a sample added with 0.04% of cellulose ether is slightly larger, so that 0.02% is finally selected as the addition amount of the cellulose ether. The cellulose ether is added, so that the dispersion of the wave-absorbing material in concrete can be effectively improved, and the construction performance of the wave-absorbing material is improved.
Example 5 mechanical Properties
Concrete samples 1 to 4 were prepared according to the formulation shown in table 9 and the preparation method of example 1, and mechanical experiments were performed.
TABLE 9
The compression strength of the test piece is measured according to the standard of the test method for the mechanical properties of common concrete (GB/T50081-2002):
the size of a compression test specimen is as follows: 150mm x 150mm (three test pieces in one set), the apparatus tested was a HYE-3000B press.
The measurement method is as follows: the test piece is placed at the central position on the pressure machine table, and the evaluation standard is that the center of the test piece can coincide with the central position of the testing machine. And (3) after the test piece is placed, starting the instrument, and controlling the load increasing rate to be 500-800 KPa per second in the whole test process. When the test piece has been sharply deformed, the instrument will automatically stop pressurizing and display the test result in the screen, and record the load number at this moment as the breaking load of the test piece.
The calculation is performed as follows:
in the formula: rc is the compressive strength (MPa) of the concrete cubic test piece;
f is the maximum load at failure (N);
a is the area (mm) of the part of the test piece subjected to the pressure2)。
And testing the test value of each test block by using each group of three cubic test blocks, and taking the arithmetic average value of the three test blocks as the compressive strength of the group of test pieces. If any two of these values differ by more than + -15%, indicating that the test failed, the test may need to be repeated. The strength of sample 28d was tested and the photo of the sample after failure is shown in FIG. 8, with the results shown in Table 10.
| Sample number | 28d/MPa |
| Sample 1 | 41.7 |
| |
43.5 |
| |
39.2 |
| Sample No. 4 | 37.3 |
Analysis of the results shows that when the iron scale is added, the compressive strength of the sample is improved compared with that of C30 concrete, mainly because the iron scale can replace sand in common concrete, the components of the concrete are simplified, and the strength of the concrete is improved. The compressive strength as a whole shows a tendency to increase first and then decrease. When the content of the iron oxide powder reaches 30%, the strength tends to be reduced, probably because the iron oxide powder is easy to agglomerate and is difficult to disperse due to the fact that the overall mechanical property is reduced.
Comparative example 1
Carbonyl iron powder was selected for testing in order to compare the absorption effect of iron scale. The carbonyl iron powder is iron powder obtained by directly decomposing carbonyl iron, has good temperature stability and high magnetic permeability, is generally divided into spherical and flake shapes, and has high price due to the flake shape, so that F01 type micron-sized carbonyl iron powder produced by Jinchuan group is selected for testing. The carbonyl iron powder has higher density, and the volume of the carbonyl iron powder is smaller under the same weight compared with that of a common wave-absorbing material, so that the dosage of a part of water is reduced in the formula 3, and the specific formula is shown in table 11.
TABLE 11
Firstly, a concrete sample block of 180mm × 180mm × 30mm is prepared according to the requirement of GJB2038-2011, and the reflection attenuation of 8-18 GHz is tested according to the requirement of the bow method, and the test results are shown in Table 12 and FIG. 6.
TABLE 12
The reflection attenuation of the concrete sample block to electromagnetic waves is stable, the reflection attenuation of the whole 8-18 GHz wave band is about 8-10 dB, the main reason is that the density of carbonyl iron powder is too large, the volume of the carbonyl iron powder is small under the same adding amount, the volume of the whole concrete sample block is small, the electromagnetic wave absorption efficiency is reduced, meanwhile, in the preparation process, the density is large, the dispersion is difficult, layering is easy to form, and therefore components in the pouring process are uneven.
(II) comparative example 1 cost estimates are shown in Table 13.
The price of the carbonyl iron powder is higher, although the carbonyl iron powder is relatively cheap spherical powder, the price also reaches 45 yuan/kg, the specific cost of the formula 3 is shown in table 4, the price of each ton of concrete is about 11410 yuan, which is about 50 times of that of common concrete materials, and the carbonyl iron powder is not beneficial to popularization and application of novel concrete. Therefore, the formulation with carbonyl iron powder added was not used in subsequent experiments.
In conclusion, the carbonyl iron powder can also improve the wave-absorbing performance of the concrete, but the carbonyl iron powder has large density, small volume, less overall wave-absorbing performance than that of iron scale, difficult dispersion and higher cost.
Comparative example 2
On the basis of the concrete proportion of the embodiment 1, 0.2% of carbon fiber is added, sample blocks of 180mm × 180mm × 30mm are manufactured, reflection attenuation of 8-18 GHz is tested according to the requirements of the bow method, and the results are shown in Table 14 and FIG. 7.
TABLE 14
According to the experimental results, the reflection attenuation of the sample block is greatly reduced, most of the electromagnetic waves are reflected, and the main reason is that the surface resistance (10-20M omega) of the concrete is changed due to the increase of the carbon fibers, the impedance matching degree of the concrete sample block is reduced, and the wave impedance of the electromagnetic waves is suddenly changed when the electromagnetic waves are transmitted in space, so that the electromagnetic waves are mainly reflected integrally, and the wave absorbing performance of the concrete is reduced. In summary, the addition of carbon fibers causes a decrease in surface resistance, increases reflection of electromagnetic waves, and decreases the electromagnetic wave absorption performance of concrete.
Although the present application has been described with reference to preferred embodiments, it is not intended to limit the scope of the claims, and many possible variations and modifications may be made by one skilled in the art without departing from the spirit of the application.
Claims (10)
1. The wave-absorbing concrete is characterized by comprising cement, iron scale, broken stone, cellulose ether, water and a water reducing agent.
2. The wave-absorbing concrete according to claim 1, wherein the iron scale has an average particle size of 60-80 meshes and an oxidation rate of 95% or more.
3. The wave-absorbing concrete according to claim 1, wherein the iron scale accounts for 22-32% of the wave-absorbing concrete by mass, and preferably 24-30%.
4. The wave-absorbing concrete according to claim 1, wherein the cement is 425% cement, and preferably, the cement accounts for 23-24% of the wave-absorbing concrete by mass.
5. The wave absorbing concrete according to claim 1, wherein the crushed stones comprise 5-10 mm crushed stones and 10-20 mm crushed stones;
preferably, the mass percentage of the crushed stone with the thickness of 5-10 mm in the wave-absorbing concrete is 15-20%;
more preferably, the broken stone with the thickness of 10-20 mm accounts for 20-25% of the wave-absorbing concrete by mass percent.
6. The wave-absorbing concrete according to claim 1, wherein the cellulose ether accounts for 0.01-0.1 wt%, preferably 0.02 wt% of the wave-absorbing concrete.
7. The wave-absorbing concrete according to claim 1, wherein the water accounts for 8-12% by mass of the wave-absorbing concrete, and preferably accounts for 10% by mass of the wave-absorbing concrete.
8. The wave-absorbing concrete according to claim 1, wherein the water reducing agent accounts for 0.1-0.5% of the wave-absorbing concrete by mass, and preferably accounts for 0.2% of the wave-absorbing concrete by mass.
9. The method for preparing the wave absorbing concrete according to any one of claims 1 to 8, wherein a scale water reducing agent is added into cement and crushed stone to mix, cellulose ether is added into a stirrer to stir uniformly, and finally water is added into the mixture to stir for 1 to 5 minutes to obtain the wave absorbing concrete.
10. The application of the wave-absorbing concrete according to any one of claims 1 to 8 in shielding electromagnetic waves, preferably, the wave-absorbing concrete has a thickness of 30 to 50 mm.
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| CN116217148A (en) * | 2023-03-08 | 2023-06-06 | 安方高科电磁安全技术(北京)有限公司 | Electromagnetic shielding cement mortar and preparation method thereof |
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