CN108439901A - A kind of cement-based absorption material preparation method adding coiled carbon fibers - Google Patents
A kind of cement-based absorption material preparation method adding coiled carbon fibers Download PDFInfo
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- CN108439901A CN108439901A CN201810343355.9A CN201810343355A CN108439901A CN 108439901 A CN108439901 A CN 108439901A CN 201810343355 A CN201810343355 A CN 201810343355A CN 108439901 A CN108439901 A CN 108439901A
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- carbon fibers
- cement
- coiled carbon
- absorption material
- based absorption
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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
Abstract
The invention discloses a kind of cement-based absorption material preparation method adding coiled carbon fibers, step is:(1) preparation of coiled carbon fibers suspension：Coiled carbon fibers are mixed, 20 30min of ultrasonic disperse with water, obtains coiled carbon fibers suspension；(2) weigh portland cement, aggregate is placed in cement mortar blender, add water to stir 2 5min, then coiled carbon fibers suspension prepared by step (1) is poured into blender, stir 1 3min, obtain and mix the cement slurries of coiled carbon fibers；(3) cement slurry will be prepared in step (2) to pour into mold, vibrates and smooth out upper surface, form removal after hardening conserves 28d under standard conditions.Reflection of electromagnetic wave rate of the cement-based absorption material provided by the invention for adding coiled carbon fibers within the scope of 1~8GHz is less than 5dB, meets the technology requirement of civil building electromagnetic protection.
Description
Technical field
The present invention relates to building material fields, and in particular to a kind of cement-based absorption material adding coiled carbon fibers.
Background technology
Along with the progress of science and technology, radiotechnics has been widely used in national defence, industrial and agricultural production, traffic
The every field such as transport, medicine, communication, information industry and civil electric appliance electronics, everything is creating huge substance for the mankind
While civilized, a living and working environment for being full of electromagnetic radiation is also gradually produced.Electromagnetic radiation pollution has become
The another big important pollution sources for influencing town dweller's health after waste water, exhaust gas, noise, noxious waste pollution.Electromagnetic environment
Deterioration can not only cause damages to communication, information security and various electronic systems, can also be to inhabitation for the survival of mankind
Space environment causes damages, and seriously threatens human health.
Cement material is resourceful, product energy consumption is low, adaptable, durability is good, is most important in engineering construction build
Material is built, and easily realizes a certain function needs by doping vario-property.For the requirement that building protects electromagenetic wave radiation,
Achieve the purpose that electromagnetic radiation protection be a kind of simple and practical ways by being modified to cement-based material.But
It is that there is current cement-based absorption material the frequency range of optimum performance to be generally 8~18GHz, and in daily life more
Common electromagnetic radiation concentrates on 8GHz or less.Therefore exploitation high-performance cement base wave-absorbing material, especially to low-frequency electromagnetic wave
The excellent cement-based absorption material of absorbent properties, has important practical significance to the improvement of electromagnetic environment.
Invention content：
The deficiency for current material of the present invention provides a kind of cement-based absorption material system adding coiled carbon fibers
Preparation Method.
The present invention uses following technical scheme：
A kind of cement-based absorption material preparation method adding coiled carbon fibers, which is characterized in that include the following steps:
(1) preparation of coiled carbon fibers suspension：Coiled carbon fibers are mixed, ultrasonic disperse with water, obtains spiral carbon fiber
Tie up suspension；
(2) weigh portland cement, aggregate is placed in cement mortar blender, add water to stir, then by step (1) prepare
Coiled carbon fibers suspension pours into blender, and stirring obtains the cement slurry for mixing coiled carbon fibers；
(3) cement slurry will be prepared in step (2) to pour into mold, vibrates and smooth out upper surface, form removal after hardening, standard
Under the conditions of conserve 28d.
Preferably, also added with dispersant in the coiled carbon fibers suspension；Also added with diminishing in the spare water
Agent.
It is further preferred that the dispersant is organic dispersing agent or inorganic dispersant；The organic dispersing agent is
Polyacrylate, poly-methyl acrylate or polycarboxylate；The inorganic dispersant is silicates or alkali metal phosphate
Class；The water-reducing rate of the high-performance water reducing agent is more than 15%.
Preferably, the coiled carbon fibers length is 40~500 μm；The grain size of the aggregate is between 0.1~5mm.
Preferably, by weight percentage, include：Portland cement 15~85%, coiled carbon fibers 0.5~5%, bone
Material 10~80%, high-performance water reducing agent 0~1.5%, dispersant 0~2%, surplus is water.
Preferably, the aggregate is that normal sand, quartz sand, river sand, flyash, expanded perlite, haydite, glass are micro-
One or more combinations in pearl, expanded vermiculite, slag powders, silicon ash.
Preferably, the cement-based absorption material is single layer structure or multilayered structure, and the number of plies is 1~3 layer.
Preferably, when the number of plies be more than two layers when, from top to bottom the coiled carbon fibers content of each layer gradually increase, aggregate content
It is gradually reduced.
It is further preferred that the preparation method that the multilayered structure adds the cement-based absorption material of coiled carbon fibers is：
Cement slurry is prepared according to step (1) to (2), then in a mold, maintenance 28d is placement layer by layer under standard conditions after form removal
.
It is further preferred that the cement-based absorption material overall thickness is between 10~60mm.
Beneficial effects of the present invention：
(1) dispersant is used in combination with ultrasonic disperse technology, can realizes the evenly dispersed of coiled carbon fibers, to inhaling wave
Performance has certain castering action；
(2) the special helical structure of coiled carbon fibers effectively reduces the suction wave frequency section of cement-based absorption material, realizes
Effective absorption to 1~8GHz frequency range electromagnetic waves；
(3) electromagnetic wave of the cement-based absorption material provided by the invention for adding coiled carbon fibers within the scope of 1~8GHz
Reflectivity is less than -5dB, meets the technology requirement of civil building electromagnetic protection.
Specific implementation mode
With reference to specific embodiment, the present invention is described further.Coiled carbon fibers are outsourcing material, purchased from wide
Dong Shuanhong new materials Science and Technology Ltd., coiled carbon fibers length are 40~500 μm；Water-reducing agent is that Chinese architecture material science is ground
Jiu Zongyuan additives research department produces, and water-reducing rate is more than 15%；5040A and 5080A dispersants tie up Persian new material purchased from Shandong
Co., Ltd；The grain size of aggregate used is between 0.1~5mm.Curing condition is with reference to national standard.
Embodiment 1：
The proportioning of each component is as follows in the present embodiment：Portland cement 22%, aggregate 66%, coiled carbon fibers 0.5%, point
Powder 0.25%, surplus are water；Wherein aggregate is normal sand, dispersant 5080A, material thickness 20mm.
Specific preparation process is as follows：
(1) matter coiled carbon fibers are mixed with the water of institute water requirement 1/2, while dispersant is added, ultrasonic disperse 30min,
Obtain coiled carbon fibers suspension；
(2) weigh portland cement, normal sand is placed in cement mortar blender, add water stir 2~5min after, by step
(1) the coiled carbon fibers suspension prepared, which pours into blender, continues 1~3min of stirring, obtains the cement mortar for mixing coiled carbon fibers
Body；
(3) cement slurry will be prepared in step (2) to pour into the mold that size is 180mm × 180mm, vibrate and smooth out
Surface, form removal after hardening conserve 28d under standard conditions.
The cement-based absorption material manufactured in the present embodiment for adding coiled carbon fibers is tested in 1~8GHz using arch method
The absorbing property of range：Minimum reflectance value is -32.5dB, and frequency bandwidth of the reflectivity less than -5dB is 4GHz.
Embodiment 2：
The proportioning of each component is as follows in the present embodiment：Portland cement 53%, aggregate 18%, coiled carbon fibers 1.4% subtract
Aqua 0.5%, dispersant 0.7%, surplus are water；Wherein aggregate is expanded perlite, and dispersant 5040A, material thickness is
10mm。
Specific preparation process is as follows：
(1) coiled carbon fibers are mixed with the water of institute water requirement 1/2, while dispersant is added, ultrasonic disperse 30min is obtained
Obtain coiled carbon fibers suspension；
(2) weigh portland cement, expanded perlite is placed in cement mortar blender, the water poured into added with water-reducing agent stirs
After mixing 2~5min, coiled carbon fibers suspension prepared by step (1) is poured into blender and continues 1~3min of stirring, is mixed
The cement slurry of coiled carbon fibers；
(3) cement slurry will be prepared in step (2) to pour into the mold that size is 180mm × 180mm, vibrate and smooth out
Surface, form removal after hardening conserve 28d under standard conditions.
The cement-based absorption material manufactured in the present embodiment for adding coiled carbon fibers is tested in 1~8GHz using arch method
The absorbing property of range：Minimum reflectance value is -14dB, and frequency bandwidth of the reflectivity less than -5dB is 3.5GHz.
Embodiment 3：
The proportioning of each component is as follows in the present embodiment：Portland cement 25%, aggregate 56%, coiled carbon fibers 1.6% subtract
Aqua 0.4%, dispersant 0.6%, surplus are water；Wherein aggregate includes 50% river sand and 6% glass microballoon, and dispersant is poly-
Sodium acrylate, material thickness 20mm.
Specific preparation process is as follows：
(1) coiled carbon fibers are mixed with the water of institute water requirement 1/2, while dispersant is added, ultrasonic disperse 30min is obtained
Obtain coiled carbon fibers suspension；
(2) portland cement, river sand and glass microballoon are weighed to be placed in cement mortar blender, is poured into added with water-reducing agent
Water stir 2~5min after, coiled carbon fibers suspension prepared by step (1) is poured into blender and continues 1~3min of stirring,
Obtain the cement slurry for mixing coiled carbon fibers；
(3) cement slurry will be prepared in step (2) to pour into the mold that size is 180mm × 180mm, vibrate and smooth out
Surface, form removal after hardening conserve 28d under standard conditions.
The cement-based absorption material manufactured in the present embodiment for adding coiled carbon fibers is tested in 1~8GHz using arch method
The absorbing property of range：Minimum reflectance value is -30dB, and frequency bandwidth of the reflectivity less than -5dB is 6GHz.
Embodiment 4：
Cement-based absorption material in the present embodiment is double-layer structure, and the proportioning of each component is as follows in first layer：Silicate
Cement 18%, normal sand 50%, coiled carbon fibers 1%, water-reducing agent 0.6%, dispersant 0.4%, surplus are water；It is each in the second layer
The proportioning of component is as follows：Portland cement 18%, normal sand 45%, coiled carbon fibers 2.5%, water-reducing agent 0.6%, dispersant
1%, surplus is water；Dispersant is sodium metasilicate, is 10mm, overall thickness 20mm per a layer thickness.
(1) coiled carbon fibers are mixed with the water of institute water requirement 1/2, while dispersant is added, ultrasonic disperse 30min is obtained
Obtain coiled carbon fibers suspension；
(2) weigh portland cement, normal sand is placed in cement mortar blender, pour into added with water-reducing agent water stir 2
After~5min, coiled carbon fibers suspension prepared by step (1) is poured into blender and continues 1~3min of stirring, spiral shell is mixed in acquisition
Revolve the cement slurry I of carbon fiber；
(3) step (1)~(2) are pressed, the cement slurry II for mixing coiled carbon fibers is prepared according to each component of the second layer；
(4) cement slurry of preparation II and I priority are poured into the mold that size is 180mm × 180mm in order, vibration
And upper surface is smoothed out, form removal after hardening conserves 28d under standard conditions.
The cement-based absorption material manufactured in the present embodiment for adding coiled carbon fibers is tested in 1~8GHz using arch method
The absorbing property of range：Minimum reflectance value is -22.5dB, and frequency bandwidth of the reflectivity less than -5dB is 6.5GHz.
Embodiment 5：
Cement-based absorption material in the present embodiment is three-decker, and the proportioning of each component is as follows in first layer：Silicate
Cement 60%, expanded perlite 25%, coiled carbon fibers 0.5%, water-reducing agent 0.6%, dispersant 0.2%, surplus are water；Second
The proportioning of each component is as follows in layer：Portland cement 55%, expanded perlite 20%, coiled carbon fibers 1.5%, water-reducing agent
0.6%, dispersant 0.6%, surplus is water；The proportioning of each component is as follows in third layer：Portland cement 50%, expanded perlite
15%, coiled carbon fibers 3%, water-reducing agent 0.6%, dispersant 1%, surplus is water；Dispersant is sodium phosphate, is per a layer thickness
15mm, overall thickness 45mm.
(1) coiled carbon fibers are mixed with the water of institute water requirement 1/2, while dispersant is added, ultrasonic disperse 30min is obtained
Obtain coiled carbon fibers suspension；
(2) weigh portland cement, expanded perlite is placed in cement mortar blender, the water poured into added with water-reducing agent stirs
After mixing 2~5min, coiled carbon fibers suspension prepared by step (1) is poured into blender and continues 1~3min of stirring, is mixed
The cement slurry I of coiled carbon fibers；
(3) step (1)~(2) are pressed, the cement slurry II for mixing coiled carbon fibers is prepared according to each component of the second layer；
(4) step (1)~(2) are pressed, the cement slurry III for mixing coiled carbon fibers is prepared according to each component of third layer；
(5) III, II, I priority of the cement slurry of preparation is poured into the mold that size is 180mm × 180mm in order, is shaken
Move and smooth out upper surface, form removal after hardening conserves 28d under standard conditions.
The cement-based absorption material manufactured in the present embodiment for adding coiled carbon fibers is tested in 1~8GHz using arch method
The absorbing property of range：Minimum reflectance value is -18dB, and frequency bandwidth of the reflectivity less than -5dB is 7GHz.
Embodiment 6：
The proportioning of each component is as follows in the present embodiment：Portland cement 20%, aggregate 45%, coiled carbon fibers 5%, diminishing
Agent 0.2, dispersant 2%, surplus are water；Wherein aggregate is 20% flyash and 25% slag powders, and dispersant is polycarboxylate, material
Material thickness is 50mm.
Specific preparation process is as follows：
(1) coiled carbon fibers are mixed with the water of institute water requirement 1/2, while dispersant is added, ultrasonic disperse 30min is obtained
Obtain coiled carbon fibers suspension；
(2) portland cement, flyash and mine tailings are weighed to be placed in cement mortar blender, are poured into added with water-reducing agent
After water stirs 2~5min, coiled carbon fibers suspension prepared by step (1) is poured into blender and continues 1~3min of stirring, is obtained
The cement slurry of coiled carbon fibers must be mixed；
(3) cement slurry will be prepared in step (2) to pour into the mold that size is 180mm × 180mm, vibrate and smooth out
Surface, form removal after hardening conserve 28d under standard conditions.
The cement-based absorption material manufactured in the present embodiment for adding coiled carbon fibers is tested in 1~8GHz using arch method
The absorbing property of range：Minimum reflectance value is -12.5dB, and frequency bandwidth of the reflectivity less than -5dB is 4.6GHz.
Embodiment 7：
The proportioning of each component is as follows in the present embodiment：Portland cement 15%, aggregate 80%, coiled carbon fibers 0.5% are remaining
Amount is water；Wherein aggregate includes quartz sand 20%, haydite 30%, expanded vermiculite 20%, silicon ash 10%, material thickness 40mm.
Specific preparation process is as follows：
(1) coiled carbon fibers are mixed, ultrasonic disperse 20min with the water of institute water requirement 1/2, obtains coiled carbon fibers and suspends
Liquid；
(2) portland cement, quartz sand, haydite, expanded vermiculite, silicon ash are weighed to be placed in cement mortar blender, is poured into
After water stirs 2~5min, coiled carbon fibers suspension prepared by step (1) is poured into blender and continues 1~3min of stirring, is obtained
The cement slurry of coiled carbon fibers must be mixed；
(3) cement slurry will be prepared in step (2) to pour into the mold that size is 180mm × 180mm, vibrate and smooth out
Surface, form removal after hardening conserve 28d under standard conditions.
The cement-based absorption material manufactured in the present embodiment for adding coiled carbon fibers is tested in 1~8GHz using arch method
The absorbing property of range：Minimum reflectance value is -32.5dB, and frequency bandwidth of the reflectivity less than -5dB is 4GHz.
Embodiment 8：
The proportioning of each component is as follows in the present embodiment：Portland cement 85%, aggregate 10%, coiled carbon fibers 1.4% subtract
Aqua 1.5%, dispersant 0.7%, surplus are water；Wherein aggregate is expanded vermiculite, and dispersant is sodium polymethacrylate, material
Thickness is 60mm.
Specific preparation process is as follows：
(1) coiled carbon fibers are mixed with the water of institute water requirement 1/2, while dispersant is added, ultrasonic disperse 25min is obtained
Obtain coiled carbon fibers suspension；
(2) weigh portland cement, expanded vermiculite is placed in cement mortar blender, pour into added with water-reducing agent water stirring
After 2~5min, coiled carbon fibers suspension prepared by step (1) is poured into blender and continues 1~3min of stirring, spiral shell is mixed in acquisition
Revolve the cement slurry of carbon fiber；
(3) cement slurry will be prepared in step (2) to pour into the mold that size is 180mm × 180mm, vibrate and smooth out
Surface, form removal after hardening conserve 28d under standard conditions.
The cement-based absorption material manufactured in the present embodiment for adding coiled carbon fibers is tested in 1~8GHz using arch method
The absorbing property of range：Minimum reflectance value is -14dB, and frequency bandwidth of the reflectivity less than -5dB is 3.5GHz.
Embodiment 9：
The proportioning of each component is as follows in the present embodiment：Portland cement 25%, aggregate 56%, coiled carbon fibers 1.6% subtract
Aqua 0.4%, surplus are water；Wherein aggregate includes 50% river sand and 6% glass microballoon, and dispersant is Sodium Polyacrylate, material
Material thickness is 20mm.
Specific preparation process is as follows：
(1) coiled carbon fibers are mixed, ultrasonic disperse 30min with the water of institute water requirement 1/2, obtains coiled carbon fibers and suspends
Liquid；
(2) portland cement, river sand and glass microballoon are weighed to be placed in cement mortar blender, is poured into added with water-reducing agent
Water stir 2~5min after, coiled carbon fibers suspension prepared by step (1) is poured into blender and continues 1~3min of stirring,
Obtain the cement slurry for mixing coiled carbon fibers；
(3) cement slurry will be prepared in step (2) to pour into the mold that size is 180mm × 180mm, vibrate and smooth out
Surface, form removal after hardening conserve 28d under standard conditions.
Above-described embodiment is merely illustrative of the technical solution of the present invention and is not intended to limit it, all without departing from the present invention
Any modification of spirit and scope or equivalent replacement should all cover the range in technical solution of the present invention.
Claims (10)
1. a kind of cement-based absorption material preparation method adding coiled carbon fibers, which is characterized in that include the following steps:
(1) preparation of coiled carbon fibers suspension：Coiled carbon fibers are mixed, ultrasonic disperse with water, it is outstanding to obtain coiled carbon fibers
Supernatant liquid；
(2) weigh portland cement, aggregate is placed in cement mortar blender, add water to stir, then by step (1) prepare spiral
Carbon fiber suspension pours into blender, and stirring obtains the cement slurry for mixing coiled carbon fibers；
(3) cement slurry will be prepared in step (2) to pour into mold, vibrates and smooth out upper surface, form removal after hardening, standard conditions
Lower maintenance 28d.
2. a kind of cement-based absorption material preparation method adding coiled carbon fibers according to claim 1, feature exist
In also added with dispersant in the coiled carbon fibers suspension；Also added with water-reducing agent in the cement slurry.
3. a kind of cement-based absorption material preparation method adding coiled carbon fibers according to claim 2, feature exist
In the dispersant is organic dispersing agent or inorganic dispersant；The organic dispersing agent is polyacrylate, poly- methyl-prop
Olefin(e) acid salt or polycarboxylate；The inorganic dispersant is silicates or alkali metal phosphate class；The high-performance diminishing
The water-reducing rate of agent is more than 15%.
4. a kind of cement-based absorption material preparation method adding coiled carbon fibers according to claim 1 or 2, feature
It is, the coiled carbon fibers length is 40~500 μm；The grain size of the aggregate is between 0.1~5mm.
5. a kind of cement-based absorption material preparation method adding coiled carbon fibers according to claim 1 or 2, feature
It is, by weight percentage, includes：Portland cement 15~85%, coiled carbon fibers 0.5~5%, aggregate 10~
80%, high-performance water reducing agent 0~1.5%, dispersant 0~2%, surplus is water.
6. a kind of cement-based absorption material preparation method adding coiled carbon fibers according to claim 1 or 2, feature
Be, the aggregate be normal sand, quartz sand, river sand, flyash, expanded perlite, haydite, glass microballoon, expanded vermiculite,
One or more combinations in slag powders, silicon ash.
7. a kind of cement-based absorption material adding coiled carbon fibers according to claim 1 or 2, which is characterized in that institute
The cement-based absorption material stated is single layer structure or multilayered structure, and the number of plies is 1~3 layer.
8. a kind of cement-based absorption material adding coiled carbon fibers according to claim 1 or 2, which is characterized in that when
When the number of plies is more than two layers, the coiled carbon fibers content of each layer gradually increases from top to bottom, aggregate content is gradually reduced.
9. a kind of cement-based absorption material adding coiled carbon fibers according to claim 7, which is characterized in that described more
The preparation method of cement-based absorption material that layer structure adds coiled carbon fibers is：Cement mortar is prepared according to step (1) to (2)
Body, then placement layer by layer in a mold, after form removal under standard conditions conserve 28d to obtain the final product.
10. a kind of cement-based absorption material adding coiled carbon fibers according to claim 7, which is characterized in that described
Cement-based absorption material overall thickness between 10~60mm.
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| CN113105175A (en) * | 2021-04-08 | 2021-07-13 | 上海戎科特种装备有限公司 | Cement-based wave-absorbing material and preparation method thereof |
| CN113149550A (en) * | 2021-04-12 | 2021-07-23 | 武汉三源特种建材有限责任公司 | Nano carbon fiber cement-based toughened and reinforced composite material and preparation method thereof |
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Application publication date: 20180824 |