CN102731042A - Cement mortar board used for absorbing electromagnetic wave - Google Patents
Cement mortar board used for absorbing electromagnetic wave Download PDFInfo
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- CN102731042A CN102731042A CN201210212859XA CN201210212859A CN102731042A CN 102731042 A CN102731042 A CN 102731042A CN 201210212859X A CN201210212859X A CN 201210212859XA CN 201210212859 A CN201210212859 A CN 201210212859A CN 102731042 A CN102731042 A CN 102731042A
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Abstract
The invention belongs to the technical field of a cement mortar material in the civil engineering, and relates to a preparation technology of a cement mortar board used for absorbing the electromagnetic wave, and the invention is characterized in that the cement mortar board comprises the following components: based on 1 m <3> of cement mortar, 780-820kg of silicate cement, 1180-1240kg of fine aggregate, 260-300kg of water, 6.2-10.8kg of high performance water-reducer, 4.68-7.38kg of multi-walled carbon nanotubes and 31.2-98.4kg of fine rubber powder. The cement mortar board has good electromagnetic wave absorption performance, can be used for civil and military activities which possess requirements of wave absorption performance, and the practical value is high.
Description
Technical field
The invention belongs to civil engineering work cement mortar material technical field, relate to a kind of absorption of electromagnetic wave reinforced cement-mortar board compounding process, specially refer to meticulous waste rubber powder and compound preparation of multi-walled carbon nano-tubes and inhale ripple mortar plate.
Background technology
Electromagnetic radiation has become the 4th source of pollution of China after topsoil, water pollution and sound pollution.Along with urban economy development and population growth; Electronics, communication, computingmachine, automobile and electricinstallation etc. get into family; Cause the artificial electromagnetic energy in city space to increase year by year; TV and Radio Service, cableless communication cell site, antennas, electrical network, Urban Transportation, individual radio means of communication and household electrical appliance etc. are brought people in the environment that is full of electromagnetic radiation into.Simultaneously, the high frequencyization of electronics, digitizing, the energy density of undesired signal increases, and the electromagnetic environment in the finite space is more worsened.The electromagnetic environment that worsens not only works the mischief to the daily communication of people, computingmachine, transport trade and other electronic systems, and can bring threat to people healthy.In addition, for the data leak that prevents equipment such as electronics, computer center with cut down radar to Target Detection Ability of Infrared, research electromagnetic shielding and absorbing material just seem extremely important.
The cement material aboundresources, product energy consumption is low, flexibility is strong, good endurance, is topmost material of construction in the engineering construction, and is prone to realize a certain function needs through doping vario-property.Terrain object such as blindage is to the requirement of electromagenetic wave radiation protection in one's power to civil building, military commanding, and the purpose that reaches electromagnetic radiation protection through the modification to cement-based material is a kind of simple and practical way.
Aspect the composition of high-performance cement based composites, used inorganic materials mostly is portland cement and high-alumina cement system, and the suction ripple component that can be used in the cement matrix mainly contains three types: conductive polymers class, carbon class and metal species.What wherein, more common, application was also wider is carbon element class (comprising graphite, carbon black and thomel) and metal species (mainly containing metal powder, steel fiber and tinsel).Super-fine powder, fiber, and magnetic ferrite etc. relatively are fit to preparation cement based electromagnetic absorption matrix material.Present existing research also shows, they can reach-10 in the frequency range of experiment test ~-assimilation effect of 20dB, can satisfy civilian requirement to plate absorbing material.
Carbon nanotube is a monodimension nanometer material, and its particular structure makes its suction ripple mechanism be different from traditional particle, has quantum effect, tunnel effect, small size and interfacial effect.Along with the rising of surface atom ratio, lattice defect increases, dangling bonds increase, and surfactivity increases; Under electromagnetic field effect; Atom, electron motion aggravation make electromagnetic energy be converted into heat energy, form the interface polarization of electrode; High specific surface area can cause multiple scattering again, and this is the important mechanism that nano material has wave-sucking performance.The characteristics that nano material also has bandwidth when having good microwave absorbing property, compatibility is good, area density is low, coating is thin.
Carbon nanotube generally is used for the research of reinforced composite, and studying more body material has polymer-based carbon, metal-based and ceramic base, the also rare research of absorbing property of relevant complex cement sill.
Rubber powder is a kind of rubber scrap, in concrete, mixes rubber powder, not only can improve concrete toughness and frost resistance, has also increased its bleed property simultaneously.Rely on ordinary Portland cement dielectric loss and the magnetic loss of MOX and some mineral materials in the cement composition electromagnetic wave energy of decaying; But because the compactness of cement is higher; The matching of its surface-duided wave impedance and spatial wave impedance is relatively poor, so its drain performance is lower.And the specific inductivity of rubber grain is lower, and its adding can be regulated the void content and the electromagnetic parameter of cement slurry, makes its input resistance and spatial wave impedance phase coupling.And, all right scattered portion hertzian wave after rubber particle surface coats one deck cement slurry, therefore, rubber grain filling concrete slurry matrix material can equivalence be a kind of closed pore absorbent structure.When hertzian wave incides when propagating in these holes, reflection and scattering just can take place in each closed pore, cause the electromagnetic wave energy loss.
" absorbing strong, bandwidth, light weight, thin thickness " is the requirement to the stealthy absorbing material of 21 century a new generation; With carbon nanotube and meticulous waste rubber powder Application of composite in cement-based material; With making sand-cement slurry have good absorption of electromagnetic wave performance, reduce cost.Have remarkable innovative significance and engineering practical value.
Summary of the invention
The present invention provides a kind of compounding process that absorbs the hertzian wave reinforced cement-mortar board, and purpose is the absorbing property that significantly improves cement-based material, obtains a kind of cement-base composite wave-absorbing material efficiently.
Technical scheme of the present invention is following:
The main raw material(s) of suction ripple reinforced cement-mortar board of the present invention is made up of cement, sand, water, high-performance water reducing agent, carbon nanotube, fine rubber powder.Each component and content are following: 1m
3Contain silicate cement 780-820kg in the sand-cement slurry, fine aggregate 1180-1240kg, water 260-300kg, multi-walled carbon nano-tubes 4.68-7.38kg, waste rubber powder 31.2-98.4 kg.
Further characteristic, mentioned component can also add high-performance water reducing agent 6.2-10.8kg.
Cement: 42.5 grades of silicate cements of P I 42.5 or P II.
Fine aggregate: river sand, II district medium sand; Silt content is less than 1%.
The water-reducing rate of high-performance water reducing agent is greater than 18%.
Multi-walled carbon nano-tubes: caliber 20-40 nanometer, length 5-15 micron.
Rubber powder can adopt waste rubber powder, and fineness is the 80-150 order.
Mass ratio by above-mentioned takes by weighing starting material, mechanical stirring, churning time 180 seconds-240 seconds, casting.
Effect of the present invention and benefit are mainly reflected in the wideband section of cement-base composite material and efficiently inhale ripple.Along with the fast development of industries such as communication, electronics and computingmachine and popularizing of military electronic warfare; The cement based absorbing material will have more wide applications; Its demand also will increase year by year, and absorbing property is good, the cement-base composite wave-absorbing material of suction ripple bandwidth will have extraordinary application prospect.Technology of the present invention with carbon nanotube and fine rubber powder Application of composite in cement-based material; With the absorption of electromagnetic wave performance that promotes cement-based material significantly; Can be used for the civilian and military field electromagnetic wave shielding is absorbed in the engineering of having relatively high expectations, have great engineering practical value and significant Technological Economy meaning.
Embodiment
Be described in detail embodiment of the present invention below in conjunction with technical scheme.
Embodiment 1
Certain stealthy mortar starting material for building and performance are following:
Cement: P I 42.5 silicate cements, certain cement mill produces, 28 days ultimate compression strength 52.5MPa, 28 days folding strength 8.2MPa.
Fine aggregate: river sand, fineness modulus is 2.70, is II district medium sand; Apparent density is 2630kg/m
3, tap density is 1270kg/m
3, closely density is 1460 kg/m
3, silt content is 2.8%, through oven dry, water ratio can be ignored before using.
Water: tap water.
Water reducer: efficient polycarboxylate water-reducer, water-reducing rate 35%.
Multi-walled carbon nano-tubes: nanometer port, Shenzhen ltd produces.Diameter 20-40 nanometer, length 5-15 micron.
Meticulous waste rubber powder: particle diameter 100 orders.
Reinforced cement-mortar board cooperates that when absorbing property is following:
Claims (7)
1. an absorption of electromagnetic wave reinforced cement-mortar board is characterized in that, the component and the content of this absorption of electromagnetic wave reinforced cement-mortar board are following: 1m
3Contain silicate cement 780-820kg, fine aggregate 1180-1240kg, water 260-300kg, multi-walled carbon nano-tubes 4.68-7.38kg, waste rubber powder 31.2-98.4 kg in the sand-cement slurry.
2. a kind of absorption of electromagnetic wave reinforced cement-mortar board as claimed in claim 1, its characteristic also is, described cement: the silicate cement that P I 42.5 or P II are 42.5 grades.
3. a kind of absorption of electromagnetic wave reinforced cement-mortar board as claimed in claim 1, its characteristic also is, described fine aggregate: river sand, II district medium sand; Silt content is less than 1%.
4. a kind of absorption of electromagnetic wave reinforced cement-mortar board as claimed in claim 1, its characteristic are that also described multi-walled carbon nano-tubes is caliber 20-40 nanometer, length 5-15 micron.
5. a kind of absorption of electromagnetic wave reinforced cement-mortar board as claimed in claim 1, its characteristic are that also the fineness of described waste rubber powder is the 80-150 order.
6. like the arbitrary described a kind of absorption of electromagnetic wave reinforced cement-mortar board of claim 1-5, its characteristic also is, also adds high-performance water reducing agent, and the add-on of high-performance water reducing agent is 6.2-10.8kg.
7. a kind of absorption of electromagnetic wave reinforced cement-mortar board as claimed in claim 6, its characteristic is that also the water-reducing rate of water reducer is greater than 18%.
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| CN201210212859XA CN102731042A (en) | 2012-06-26 | 2012-06-26 | Cement mortar board used for absorbing electromagnetic wave |
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| CN201210212859XA CN102731042A (en) | 2012-06-26 | 2012-06-26 | Cement mortar board used for absorbing electromagnetic wave |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103866703A (en) * | 2012-12-10 | 2014-06-18 | 凌敏 | Noise absorption module |
| CN104326707A (en) * | 2014-10-20 | 2015-02-04 | 山东圣泉新材料股份有限公司 | Veneer mortar for whiskering-resistant outer walls |
| CN104628421A (en) * | 2015-01-27 | 2015-05-20 | 济南大学 | Surface wave-absorbing modification technology for cement and concrete |
| CN105181808A (en) * | 2015-10-10 | 2015-12-23 | 济南大学 | Front-emitting integrated sound emitting sensor and preparation method thereof |
| CN104844076B (en) * | 2014-10-14 | 2017-02-15 | 江苏苏博特新材料股份有限公司 | Polymer cement-based composite protection material for nuclear power projects, and preparation method thereof |
| CN107382148A (en) * | 2017-07-04 | 2017-11-24 | 汤始建华建材（苏州）有限公司 | A kind of multifunctional concrete and preparation method thereof |
| CN108424050A (en) * | 2018-04-16 | 2018-08-21 | 湖北工业大学 | A kind of Electromagnetic Shielding Concrete, the preparation method of concrete prefabricated board and concrete prefabricated board |
| CN109293310A (en) * | 2018-10-29 | 2019-02-01 | 盐城工学院 | A kind of double-layer cement base suction wave plate and preparation method thereof for mixing graphene nanometer sheet again |
| CN111978032A (en) * | 2019-05-21 | 2020-11-24 | 中国人民解放军军事科学院军事医学研究院 | Porcelain stone-based electromagnetic radiation absorbing material for buildings and preparation method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101935194A (en) * | 2010-08-24 | 2011-01-05 | 深圳广田装饰集团股份有限公司 | Lightweight plastering mortar and construction method thereof |
| CN102199021A (en) * | 2011-03-26 | 2011-09-28 | 大连理工大学 | Nano-material composite concrete with super high performance |
-
2012
- 2012-06-26 CN CN201210212859XA patent/CN102731042A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101935194A (en) * | 2010-08-24 | 2011-01-05 | 深圳广田装饰集团股份有限公司 | Lightweight plastering mortar and construction method thereof |
| CN102199021A (en) * | 2011-03-26 | 2011-09-28 | 大连理工大学 | Nano-material composite concrete with super high performance |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103866703A (en) * | 2012-12-10 | 2014-06-18 | 凌敏 | Noise absorption module |
| CN104844076B (en) * | 2014-10-14 | 2017-02-15 | 江苏苏博特新材料股份有限公司 | Polymer cement-based composite protection material for nuclear power projects, and preparation method thereof |
| CN104326707A (en) * | 2014-10-20 | 2015-02-04 | 山东圣泉新材料股份有限公司 | Veneer mortar for whiskering-resistant outer walls |
| CN104628421A (en) * | 2015-01-27 | 2015-05-20 | 济南大学 | Surface wave-absorbing modification technology for cement and concrete |
| CN104628421B (en) * | 2015-01-27 | 2016-09-07 | 济南大学 | Wavefront modifier technology is inhaled on the surface of a kind of cement and concrete |
| CN105181808A (en) * | 2015-10-10 | 2015-12-23 | 济南大学 | Front-emitting integrated sound emitting sensor and preparation method thereof |
| CN105181808B (en) * | 2015-10-10 | 2017-03-29 | 济南大学 | The preparation method of integrated acoustic emission sensor is put before a kind of |
| CN107382148A (en) * | 2017-07-04 | 2017-11-24 | 汤始建华建材（苏州）有限公司 | A kind of multifunctional concrete and preparation method thereof |
| CN108424050A (en) * | 2018-04-16 | 2018-08-21 | 湖北工业大学 | A kind of Electromagnetic Shielding Concrete, the preparation method of concrete prefabricated board and concrete prefabricated board |
| CN108424050B (en) * | 2018-04-16 | 2021-09-28 | 湖北工业大学 | Electromagnetic shielding concrete, concrete precast slab and preparation method of concrete precast slab |
| CN109293310A (en) * | 2018-10-29 | 2019-02-01 | 盐城工学院 | A kind of double-layer cement base suction wave plate and preparation method thereof for mixing graphene nanometer sheet again |
| CN111978032A (en) * | 2019-05-21 | 2020-11-24 | 中国人民解放军军事科学院军事医学研究院 | Porcelain stone-based electromagnetic radiation absorbing material for buildings and preparation method thereof |
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Application publication date: 20121017 |