CN108640605A - A kind of composition, preparation method and its application in concrete field - Google Patents
A kind of composition, preparation method and its application in concrete field Download PDFInfo
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- CN108640605A CN108640605A CN201810533018.6A CN201810533018A CN108640605A CN 108640605 A CN108640605 A CN 108640605A CN 201810533018 A CN201810533018 A CN 201810533018A CN 108640605 A CN108640605 A CN 108640605A
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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
- 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
-
- 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
-
- 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
- C04B2201/52—High compression strength concretes, i.e. with a compression strength higher than about 55 N/mm2, e.g. reactive powder concrete [RPC]
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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)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention belongs to building material technical field more particularly to a kind of composition, preparation method and its in the application of concrete field.The present invention provides a kind of compositions, including：Gel rubber material, silica sand, silica flour, steel fibre, water-reducing agent and water；The gel rubber material includes：Cement and/or SILICA FUME.The present invention also provides a kind of preparation method of above-mentioned composition, the present invention also provides a kind of product obtained including above-mentioned composition or above-mentioned preparation method concrete field application.In technical solution provided by the invention, used raw material is easy to get, is of low cost, and preparation process is simple；Being measured through experiment can obtain, and compared with conventional concrete, obtained product has good mechanical property, can be widely applied to multiple fields.A kind of composition, preparation method and its application in concrete field provided by the invention, solve in the prior art, the technological deficiency that there is use scopes to be limited for concrete, production technology is complicated and cost price is high.
Description
Technical field
It is led the invention belongs to building material technical field more particularly to a kind of composition, preparation method and its in concrete
The application in domain.
Background technology
Concrete refers to by cementitious material by the general designation for the cementing integral cement-base composite material that gathers materials.Usually say
One word of concrete refers to making cementitious material with cement, and sand, masonry gather materials；By a certain percentage with water (additive and admixture can be contained)
Cooperation, it is agitated obtained by normal concrete, be just widely used in field of civil engineering.
With the development of productivity, traditional concrete cannot meet highly difficult, high standard, the building of high request,
The construction demand of bridge or tunnel.Currently, having been developed for much being directed to the different high performance concretes using function, such as：
Super high strength concrete, pressure-sensitive concrete, conducting concrete, strain hardening concrete etc..
However, to meet above-mentioned specific demand, many composite materials and additive etc. can be added when prepared by concrete, than
Such as：Microballon, rice hull ash, carbon nanotube, composite fibre, swelling agent, antifoaming agent, material dispersant, plasticity-maintaining agent etc., result in coagulation
That there is use scopes is limited for soil, production technology is complicated and the shortcomings such as cost price height.
Therefore, a kind of composition, preparation method and its application in concrete field are developed, for solving the prior art
In, the technological deficiency that there is use scopes to be limited for concrete, production technology is complicated and cost price is high becomes this field
Technical staff's urgent problem to be solved.
Invention content
In view of this, the present invention provides a kind of composition, preparation method and its in the application of concrete field, for solving
Certainly in the prior art, the concrete technological deficiency that there is use scopes to be limited, production technology is complicated and cost price is high.
The present invention provides a kind of composition, the raw material of the composition includes：Gel rubber material, silica sand, quartz sand, steel are fine
Dimension, water-reducing agent and water；
The gel rubber material includes：Cement and/or SILICA FUME.
Preferably, in terms of mass parts, the raw material of the composition includes：600~750 parts of cement, SILICA FUME 150~200
Part, 150~250 parts of silica flour, 700~800 parts of silica sand, 150~250 parts of steel fibre and 8~15 parts of water-reducing agent.
Preferably, in terms of mass parts, the rate of charge of the gel rubber material and water is 1:(0.18~0.22).
Preferably, the silica sand includes：First grain size quartz sand, the second grain size quartz sand and third grain size quartz sand；
The grain size of the first grain size quartz sand is 400~800 μm, the grain size of the second grain size quartz sand is 200~
400 μm, the grain size of the third grain size quartz sand is 100~200 μm.
Preferably, in terms of mass parts, the silica sand includes：First grain size quartz sand, the second grain size quartz sand and third grain
The rate of charge of diameter quartz sand is 1：(0.4~0.5)：(0.3~0.4).
Preferably, the specific surface area of the SILICA FUME is (20~25) × 103m2The grain size of/kg, the SILICA FUME are 0.5
~2 μm.
Preferably, the dioxide-containing silica of the silica flour is more than 95%, and the grain size of the silica flour is 45~60 μm.
Preferably, the steel fibre is the fine flat shape steel wire fibre of copper facing；
A length of 13mm of the steel fibre, a diameter of 175 μm of the steel fibre, the tensile strength of the steel fibre is more than
1800MPa。
Preferably, the water-reducing agent is powdery polycarboxylic-acid water-reducing agent, the water-reducing rate of the water-reducing agent is 25%~
40%.
The present invention also provides a kind of preparation method including the composition described in any of the above one, the preparation methods
For：
Step 1: after cement, SILICA FUME, silica flour and silica sand mixing, 3~5min is stirred, the first product is obtained；
Step 2: after first product is mixed with water and water-reducing agent, 4~8min is stirred, the second product is obtained；
Step 3: after second product is mixed with steel fibre, 5~8min is stirred, slurry is obtained；
Step 4: the slurry obtains product after die-filling, solidification and maintenance.
The present invention also provides the productions that a kind of composition including described in any of the above one or above-mentioned preparation method obtain
Application of the product in concrete field.
In conclusion the present invention provides a kind of composition, the raw material of the composition includes：Gel rubber material, silica sand, stone
Ying Fen, steel fibre, water-reducing agent and water；The gel rubber material includes：Cement and/or SILICA FUME.The present invention also provides one kind
The preparation method of above-mentioned composition, the present invention also provides a kind of products obtained including above-mentioned composition or above-mentioned preparation method
In the application of concrete field.In technical solution provided by the invention, used raw material is easy to get, is of low cost, preparation process
Simply；Being measured through experiment can obtain, and compared with conventional concrete, obtained product has good mechanical property, can answer extensively
For multiple fields.The present invention provides a kind of composition, preparation method and its in the application of concrete field, for solving now
Have in technology, the technological deficiency that there is use scopes to be limited for concrete, production technology is complicated and cost price is high.
Specific implementation mode
An embodiment of the present invention provides a kind of composition, preparation method and its in the application of concrete field, for solving
In the prior art, the concrete technological deficiency that there is use scopes to be limited, production technology is complicated and cost price is high.
The technical scheme in the embodiments of the invention will be clearly and completely described below, it is clear that described implementation
Example is only a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, this field is common
The every other embodiment that technical staff is obtained without making creative work belongs to the model that the present invention protects
It encloses.
In order to which the present invention is described in more detail, with reference to embodiment to a kind of composition provided by the invention, preparation method
And its application in concrete field, it is specifically described.
Embodiment 1
In forced mixer, it is mixed that 670kg cement, 170kg SILICA FUMEs, 200kg silica flours and 740kg silica sands is added
After conjunction, 5min is stirred, the first product 1 is obtained.
After 170kg water and 10kg water-reducing agents are added to the first product 1 and mix, continues to stir 8min, obtain the second product 1.
After 200kg steel fibres 1 are added to the second product 1,8min is stirred, slurry 1 is obtained.
Gained slurry 1 pours into die-filling in mold in three times, pours into the one third of volume every time, is often packed into a slurry 1
Shake table is used to vibrate 60 seconds afterwards, form removal after outdoor standing is cured for one day conserves 3 days under 90 DEG C of environment, obtains coagulation
Native produce 1.
In the present embodiment, cement uses the golden II 52.5R portland cements of sheep board P of Zhujiang Cement Plant, Guangzhou's production；
Wherein, 3 days compression strength 28.9MPa of cement, 28 days compression strength 54.3MPa, 3 days flexural strength 6.2MPa, 28 days anti-foldings
Intensity 7.5MPa, specific surface area 320m2/kg；
In the present embodiment, SILICA FUME uses the SILICA FUME of Shandong Bo Ken silicon materials Co., Ltd production, SiO2Content is
94.35%, specific surface area is 23 × 103m2/ kg, grain size are 0.5~2 μm, and pozzolanic activity index is more than 116%.
In the present embodiment, silica flour is quartzy using model HY~G5 of Shenzhen sea powder spreading body Science and Technology Ltd. production
Powder, 325 mesh screen residue rates are 0.5%, pH value 8~10, whiteness >=94, SiO2Content >=95%.
In the present embodiment, the silica sand that silica sand is produced using the double hydrations in Jiangmen city Xinhui District at glass-ceramic Raw material processing factory,
Respectively purchase (800~400) μm, (400~200) μm, (200~100) μm three kinds of particle size ranges silica sand, before use, according to
Mass ratio 1：0.465：0.300 is used in mixed way；
In the present embodiment, steel fibre uses the fine flat shape steel wire of the copper facing of CW01~02/13 of Wuhan Xin Tu companies production
Fiber, length 13mm, 175 μm, tensile strength 2000MPa, elasticity modulus 750GPa of diameter.；
In the present embodiment, the polycarboxylic acids for model QS~8020 that water-reducing agent is produced using Shanghai Qi Shuo Industrial Co., Ltd.s
High efficiency water reducing agent, water-reducing rate 35%.
In the present embodiment, using tap water as mixing water.
Embodiment 2
In forced mixer, it is mixed that 600kg cement, 150kg SILICA FUMEs, 200kg silica flours and 800kg silica sands is added
After conjunction, 5min is stirred, the first product 2 is obtained.
After 135kg water and 8kg water-reducing agents are added to the first product 2 and mix, continues to stir 6min, obtain the second product 2.
After 250kg steel fibres are added to the second product 2,5min is stirred, slurry 2 is obtained.
Gained slurry 2 pours into die-filling in mold in three times, pours into the one third of volume every time, is often packed into a slurry 2
Shake table is used to vibrate 60 seconds afterwards, form removal after outdoor standing is cured for one day conserves 3 days under 90 DEG C of environment, obtains coagulation
Native produce 2.
In the present embodiment, cement uses the golden II 52.5R portland cements of sheep board P of Zhujiang Cement Plant, Guangzhou's production；
Wherein, 3 days compression strength 28.9MPa of cement, 28 days compression strength 54.3MPa, 3 days flexural strength 6.2MPa, 28 days anti-foldings
Intensity 7.5MPa, specific surface area 320m2/kg；
In the present embodiment, SILICA FUME uses the SILICA FUME of Shandong Bo Ken silicon materials Co., Ltd production, SiO2Content is
94.35%, specific surface area is 23 × 103m2/ kg, grain size are 0.5~2 μm, and pozzolanic activity index is more than 116%.
In the present embodiment, silica flour is quartzy using model HY~G5 of Shenzhen sea powder spreading body Science and Technology Ltd. production
Powder, 325 mesh screen residue rates are 0.5%, pH value 8~10, whiteness >=94, SiO2Content >=95%.
In the present embodiment, the silica sand that silica sand is produced using the double hydrations in Jiangmen city Xinhui District at glass-ceramic Raw material processing factory,
Respectively purchase (800~400) μm, (400~200) μm, (200~100) μm three kinds of particle size ranges silica sand, before use, according to
Mass ratio 1：0.400：0.325 is used in mixed way；
In the present embodiment, steel fibre uses the fine flat shape steel wire of the copper facing of CW01~02/13 of Wuhan Xin Tu companies production
Fiber, length 13mm, 175 μm, tensile strength 2000MPa, elasticity modulus 750GPa of diameter.；
In the present embodiment, the polycarboxylic acids for model QS~8020 that water-reducing agent is produced using Shanghai Qi Shuo Industrial Co., Ltd.s
High efficiency water reducing agent, water-reducing rate 35%.
In the present embodiment, using tap water as mixing water.
Embodiment 3
In forced mixer, it is mixed that 750kg cement, 180kg SILICA FUMEs, 250kg silica flours and 700kg silica sands is added
After conjunction, 4min is stirred, the first product 3 is obtained.
After 205kg water and 15kg water-reducing agents are added to the first product 3 and mix, continues to stir 4min, obtain the second product 3.
After 150kg steel fibres are added to the second product 3,7min is stirred, slurry 3 is obtained.
Gained slurry 3 pours into die-filling in mold in three times, pours into the one third of volume every time, is often packed into a slurry 3
Shake table is used to vibrate 60 seconds afterwards, form removal after outdoor standing is cured for one day conserves 3 days under 90 DEG C of environment, obtains coagulation
Native produce 3.
In the present embodiment, cement uses the golden II 52.5R portland cements of sheep board P of Zhujiang Cement Plant, Guangzhou's production；
Wherein, 3 days compression strength 28.9MPa of cement, 28 days compression strength 54.3MPa, 3 days flexural strength 6.2MPa, 28 days anti-foldings
Intensity 7.5MPa, specific surface area 320m2/kg；
In the present embodiment, SILICA FUME uses the SILICA FUME of Shandong Bo Ken silicon materials Co., Ltd production, SiO2Content is
94.35%, specific surface area is 23 × 103m2/ kg, grain size are 0.5~2 μm, and pozzolanic activity index is more than 116%.
In the present embodiment, silica flour is quartzy using model HY~G5 of Shenzhen sea powder spreading body Science and Technology Ltd. production
Powder, 325 mesh screen residue rates are 0.5%, pH value 8~10, whiteness >=94, SiO2Content >=95%.
In the present embodiment, the silica sand that silica sand is produced using the double hydrations in Jiangmen city Xinhui District at glass-ceramic Raw material processing factory,
Respectively purchase (800~400) μm, (400~200) μm, (200~100) μm three kinds of particle size ranges silica sand, before use, according to
Mass ratio 1：0.500：0.400 is used in mixed way；
In the present embodiment, steel fibre uses the fine flat shape steel wire of the copper facing of CW01~02/13 of Wuhan Xin Tu companies production
Fiber, length 13mm, 175 μm, tensile strength 2000MPa, elasticity modulus 750GPa of diameter.；
In the present embodiment, the polycarboxylic acids for model QS~8020 that water-reducing agent is produced using Shanghai Qi Shuo Industrial Co., Ltd.s
High efficiency water reducing agent, water-reducing rate 35%.
In the present embodiment, using tap water as mixing water.
Embodiment 4
The present embodiment is the specific embodiment for measuring 1~3 mechanical property of concrete product made from Examples 1 to 3.
In the present embodiment, the assay method of indices is with reference to all well known measurement side of national standard and those skilled in the art
Method, details are not described herein, and used reference substance is certain commercially available customary commercial concrete.
Gained measurement result please refers to table 1.
Table 1：Sample mechanical property
As can be drawn from Table 1, concrete product made from technical solution provided by the present application has good mechanical property
Energy.
It can be obtained from above-described embodiment, technical solution provided by the invention has the following advantages：
(1) in the present invention, used SILICA FUME is the waste material that smelting commercial silicon generates, and is derived from a wealth of sources, and is had extremely strong
Pozzolanic feature energy can accelerate the hydration process of cement；Secondary hydration can occur with the entringite for being unfavorable for concrete inner structure
Reaction generates C-S-H gels, is conducive to improve gel-aggregate transition region, improves the mechanical property of concrete.
(2) present invention in, institute using the particle size range and mass ratio of silica sand and silica flour be through calculating and repeatedly try
With the obtained experiment conclusion of experiment, concrete density can be effectively improved, air entrapment is reduced, improves mobility and closely knit
Degree is not changing material category, and the particle size range of aggregate and the control of mass ratio can make mechanical performance of concrete improve about 20%.
(3) in the present invention, institute can effectively improve toughness of concrete using steel fibre, tensile splitting strength, flexural strength, resist
Curved intensity, but volume is excessive that concrete workability is caused to decline, the volume range that this patent provides be by experimental demonstration most
Excellent volume.
(4) in the present invention, the in summary characteristic of material, on the one hand, the reasonable cycling and reutilization of SILICA FUME is may advantageously facilitate,
So that garbage waste is turned waste into wealth, reduces environmental pollution；On the other hand, only than normal concrete to add since raw material types are few more
Steel fibre and SILICA FUME are added so that construction technology is simple, and engineering cost is low.
(5) in the present invention, based on maximal unit weight method, the ultra-high performance concrete produced has outstanding power
Learn performance, 4 days compression strength ＞ 190MPa, split tensile strength ＞ 10MPa, slump ＞ 200mm, flexural strength ＞ 30MPa.
In conclusion the present invention provides a kind of composition, the raw material of the composition includes：Gel rubber material, silica sand, stone
Ying Fen, silica flour, steel fibre, water-reducing agent and water；The gel rubber material includes：Cement and/or SILICA FUME.The present invention also provides
A kind of preparation method of above-mentioned composition is obtained the present invention also provides a kind of including above-mentioned composition or above-mentioned preparation method
Application of the product in concrete field.In technical solution provided by the invention, used raw material is easy to get, is of low cost, prepares
It is simple for process；Being measured through experiment can obtain, and compared with conventional concrete, obtained product has good mechanical property, can be wide
It is general to be applied to multiple fields.The present invention provides a kind of composition, preparation method and its in the application of concrete field, for solving
Certainly in the prior art, the concrete technological deficiency that there is use scopes to be limited, production technology is complicated and cost price is high.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (11)
1. a kind of composition, which is characterized in that the raw material of the composition includes：Gel rubber material, silica sand, silica flour, steel fibre,
Water-reducing agent and water；
The gel rubber material includes：Cement and/or SILICA FUME.
2. composition according to claim 1, which is characterized in that in terms of mass parts, the raw material of the composition includes：Water
600~750 parts of mud, 150~200 parts of SILICA FUME, 150~250 parts of silica flour, 700~800 parts of silica sand, steel fibre 150~250
8~15 parts of part and water-reducing agent.
3. composition according to claim 1 or 2, which is characterized in that in terms of mass parts, the throwing of the gel rubber material and water
Material is than being 1:(0.18~0.22).
4. composition according to claim 1, which is characterized in that the silica sand includes：First grain size quartz sand, second
Diameter quartz sand and third grain size quartz sand；
The grain size of the first grain size quartz sand is 400~800 μm, and the grain size of the second grain size quartz sand is 200~400 μ
The grain size of m, the third grain size quartz sand are 100~200 μm.
5. composition according to claim 4, which is characterized in that in terms of mass parts, the silica sand includes：First grain size stone
The rate of charge of sand, the second grain size quartz sand and third grain size quartz sand is 1：(0.4~0.5)：(0.3~0.4).
6. composition according to claim 1, which is characterized in that the specific surface area of the SILICA FUME be (20~25) ×
103m2The grain size of/kg, the SILICA FUME are 0.5~2 μm.
7. composition according to claim 1, which is characterized in that the dioxide-containing silica of the silica flour is more than 95%,
The grain size of the silica flour is 45~60 μm.
8. composition according to claim 1, which is characterized in that the steel fibre is that the fine flat shape steel wire of copper facing is fine
Dimension；
A length of 13mm of the steel fibre, a diameter of 175 μm of the steel fibre, the tensile strength of the steel fibre is more than
1800MPa。
9. composition according to claim 1, which is characterized in that the water-reducing agent is powdery polycarboxylic-acid water-reducing agent,
The water-reducing rate of the water-reducing agent is 25%~40%.
10. a kind of preparation method including the composition described in claim 1 to 9 any one, which is characterized in that the preparation
Method is：
Step 1: after cement, SILICA FUME, silica flour and silica sand mixing, 3~5min is stirred, the first product is obtained；
Step 2: after first product is mixed with water and water-reducing agent, 4~8min is stirred, the second product is obtained；
Step 3: after second product is mixed with steel fibre, 5~8min is stirred, slurry is obtained；
Step 4: the slurry through it is die-filling, vibrate, cure and conserve after, obtain product.
11. a kind of composition including described in claim 1 to 9 any one or preparation method according to any one of claims 10 obtain
Product concrete field application.
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Cited By (3)
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| CN109293311A (en) * | 2018-11-07 | 2019-02-01 | 广东工业大学 | Ultra-high performance concrete slurry, ultra-high performance concrete and preparation method thereof |
| CN109555267A (en) * | 2018-12-03 | 2019-04-02 | 广东工业大学 | A kind of complex coagulation earth pillar and preparation method thereof |
| CN111339655A (en) * | 2020-02-24 | 2020-06-26 | 浙江大学 | Method for prejudging elastic modulus change of carbon nano tube composite material |
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| AU3253500A (en) * | 1999-05-05 | 2000-11-09 | Construction Research & Technology Gmbh | Reactive powder concrete compositions |
| CN102320789A (en) * | 2011-08-29 | 2012-01-18 | 四川西南交大铁路发展有限公司 | High-strength active powder concrete and preparation method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109293311A (en) * | 2018-11-07 | 2019-02-01 | 广东工业大学 | Ultra-high performance concrete slurry, ultra-high performance concrete and preparation method thereof |
| CN109555267A (en) * | 2018-12-03 | 2019-04-02 | 广东工业大学 | A kind of complex coagulation earth pillar and preparation method thereof |
| CN111339655A (en) * | 2020-02-24 | 2020-06-26 | 浙江大学 | Method for prejudging elastic modulus change of carbon nano tube composite material |
| CN111339655B (en) * | 2020-02-24 | 2022-06-10 | 浙江大学 | Method for prejudging elastic modulus change of carbon nano tube composite material |
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Application publication date: 20181012 |