CN105884305B - A kind of method that dry-mixed dry-pressing prepares Carbon Fiber Cement-based Composites - Google Patents
A kind of method that dry-mixed dry-pressing prepares Carbon Fiber Cement-based Composites Download PDFInfo
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- CN105884305B CN105884305B CN201610240948.3A CN201610240948A CN105884305B CN 105884305 B CN105884305 B CN 105884305B CN 201610240948 A CN201610240948 A CN 201610240948A CN 105884305 B CN105884305 B CN 105884305B
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- carbon fiber
- dry
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- mixed
- based composites
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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
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/02—Treatment
-
- 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
- C04B28/06—Aluminous cements
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Press-Shaping Or Shaping Using Conveyers (AREA)
- Manufacture Of Alloys Or Alloy Compounds (AREA)
- Producing Shaped Articles From Materials (AREA)
Abstract
A kind of method that dry-mixed dry-pressing prepares Carbon Fiber Cement-based Composites, it is first that chopped carbon fiber is pre-dispersed into monofilament shape, then it is dry-mixed uniformly and directly dry-pressing formed together with other raw materials, conserved again, wherein chopped carbon fiber can be PAN bases, asphaltic base or viscose base, chopped carbon fiber length is 5 10mm, the present invention is using chopped carbon fiber with sulphate aluminium cement with the method mixed, it is but first with glue sand agitator that chopped carbon fiber is pre-dispersed into monofilament shape before mixing, then together mixed with other raw materials in simpson mill, conserved after finally the raw material direct pressing mixed is molded in water to fully hardened；This method carbon fiber is evenly distributed, dispersant, defoamer and water reducer need not be added, reduce the cement matrix porosity, and it can avoid adding Carbon Fiber Cement-based Composites electrical conductivity reduction caused by cellulose dispersant, when avoiding compressing after cement and water mix, the problem of sulphate aluminium cement quick-hardening reduces cement matrix bond strength.
Description
Technical field
The invention belongs to Carbon Fiber Cement-based Composites preparing technical field, more particularly to a kind of dry-mixed dry-pressing prepares carbon
The method of fiber cement composites.
Background technology
Chopped carbon fiber is mainly dispersed in cement matrix by Carbon Fiber Cement-based Composites, can not only be improved
The cracking resistance of cement-based material, shearing strength, the ability of modulus of elasticity and control surface Crack Extension, and electrical property
Can be improved significantly.Research finds that Carbon Fiber Cement-based Composites have pressure-sensitive, Seebeck effects and electrocaloric effect,
It is a kind of smart material.Using pressure-sensitive, the stress state and degree of injury of itself can be diagnosed, be supervised available for traffic
Survey；Using Seebeck effects and electrocaloric effect, self diagnosis and Self Adaptive Control can be carried out to the temperature of structure.
Realize that the key of Carbon Fiber Cement-based Composites application is to make it have higher conductance by preparation technology
Rate and Seebeck coefficients, and relatively low thermal conductivity.The existing method for preparing Carbon Fiber Cement-based Composites is used more and poured
Moulding process, so-called pouring molding are exactly that carbon fiber and cement are equipped with into certain additive and water, after stirring, pour into mould
Has vibratory compaction.The cement-base composite material porosity obtained by this method is higher, and cellulose dispersant can reduce carbon fiber
The electrical conductivity of cement-base composite material.
" patent No. ZL201310078609.6 " Chinese patent discloses one kind and prepared with deicing or snow melting function document 1
Carbon Fiber Reinforced Conductive Concrete method.This method mainly pours into the compound of dispersant, water reducer and defoamer and water
Stir, be stirred again after then adding chopped carbon fiber and stone, last pouring molding simultaneously conserves in cement mortar.Should
Method mixes technique after using carbon fiber, with cement mixing in mortar, is not only difficult to be well mixed, and easily to cement mortar
Middle introducing bubble, influence the final electric conductivity of carbon fiber reinforced concrete.
Document 2 (Tang Zuquan, Li Zhuoqiu, Xu Dongliang, Wuhan University of Technology's journal, 2001,23 (3)：5-7) disclose one kind
The preparation method of carbon fiber reinforced concrete.Methylcellulose is first dissolved in water by this method, is then added chopped carbon fiber and is stirred
It is scattered, add the uniform after-pouring of cement mixing and be molded and conserve.But methylcellulose can make the conductance of carbon fiber reinforced concrete
Rate reduces, and carbon fiber reinforced concrete microstructure porosity obtained by pouring molding technique is higher.
Document 3 (Xu Ronghua, Zhang Decheng, yellow generation cutting edge of a knife or a sword etc., University Of Ji'nan's journal, 2009,23 (2)：111-114) disclose one
The method that kind prepares Carbon Fiber Cement-based Composites.This method will add water stirring after carbon fiber and sulphate aluminium cement dry mixing
Uniformly, last repressed shaping prepares Carbon Fiber Cement-based Composites.But sulphate aluminium cement and meeting after water mix are quick
Aquation, the bond strength between hydrated product is reduced, and the control of its pressing process parameters lacks quantification.
The content of the invention
The shortcomings that in order to overcome above-mentioned prior art, it is an object of the invention to provide a kind of dry-mixed dry-pressing to prepare carbon fiber
The method of cement-base composite material, porosity height caused by existing Carbon Fiber Cement-based Composites casting craft is overcome,
Caused by cellulose dispersant electrical conductivity reduce, and using sulphate aluminium cement it is compressing when, the too fast influence of setting rate
The problems such as final material intensity, its structure can be made more closely knit.
To achieve these goals, the technical solution adopted by the present invention is：
A kind of method that dry-mixed dry-pressing prepares Carbon Fiber Cement-based Composites, first by the pre-dispersed Cheng Dan of chopped carbon fiber
It is thread, it is then dry-mixed uniformly and directly dry-pressing formed together with other raw materials, then conserved.
The chopped carbon fiber is PAN bases, asphaltic base or viscose base.
The chopped carbon fiber length is 5-10mm.
Other described raw materials are：
Sulphate aluminium cement；Or
Portland cement；Or
The mixture of sulphate aluminium cement and aggregate；Or
The mixture of portland cement and aggregate.
Addition of the chopped carbon fiber in Carbon Fiber Cement-based Composites is aluminium sulfate used in composite
The 0.5-1.2% of the cement quality or 0.5-1.2% of portland cement quality.
The chopped carbon fiber is dispersed into monofilament shape with glue sand agitator, is mixed with other raw materials in simpson mill
Close, conserved in water to fully hardened.Before maintenance is immersed in the water, first sample can be impregnated with and exposed to humidity completely with water
Precuring is carried out in environment, effectively avoid precuring it is insufficient produce micro-crack the problem of.
During the pre-dispersed chopped carbon fiber, glue sand agitator elder generation stirring at low speed 5min, then high-speed stirred 5min.
The chopped carbon fiber and other raw materials mixed in simpson mill 20-25min realize it is dry-mixed.
It is described dry-pressing formed, be by the mixed raw material of simpson mill apply in steel die 20-60MPa into
Type pressure, shaping press time are 30-60s.
Compared with prior art, the beneficial effects of the invention are as follows：The present invention uses chopped carbon fiber and sulphate aluminium cement
With the method mixed, but with glue sand agitator that chopped carbon fiber is pre-dispersed into monofilament shape first before mixing, then with its
He together mixes raw material in simpson mill, is conserved after finally the raw material direct pressing mixed is molded in water to complete
Pansclerosis.This method carbon fiber is evenly distributed, it is not necessary to adds dispersant, defoamer and water reducer, reduces cement matrix stomata
Rate, and can avoid add cellulose dispersant caused by Carbon Fiber Cement-based Composites electrical conductivity reduce, avoid cement with
When compressing after water mix, sulphate aluminium cement quick-hardening reduce cement matrix bond strength the problem of.
Brief description of the drawings
Fig. 1 is the dry-mixed dry-pressing formed gained Carbon Fiber Cement-based Composites of the present invention and carbon fiber water obtained by moulding by casting
The compression strength comparison diagram of cement-based composite material and dry-pressing formed gained striaght cement.
Fig. 2 is the dry-mixed dry-pressing formed gained Carbon Fiber Cement-based Composites of the present invention and carbon fiber water obtained by moulding by casting
The porosity comparison diagram of cement-based composite material.
Fig. 3 is the dry-mixed dry-pressing formed gained Carbon Fiber Cement-based Composites of the present invention and carbon fiber water obtained by moulding by casting
The electrical conductivity comparison diagram of cement-based composite material.
Embodiment
Describe embodiments of the present invention in detail with reference to the accompanying drawings and examples.
Embodiment 1
Prepare steel die, be 1 according to mass ratio:100 ratio, weigh PAN bases chopped carbon fiber and aluminium sulfate water
Mud.
Pre-dispersed, first stirring at low speed 5min, then high-speed stirred 5min are carried out to chopped carbon fiber using glue sand agitator, is made
It is into monofilament shape.Proportionally pre-dispersed chopped carbon fiber, sulphate aluminium cement are placed in simpson mill successively and mixed
Close 20min.It is finally dry-pressing formed with 50MPa pressure, Carbon Fiber Cement-based Composites sample is formed, is conserved in water to complete
Pansclerosis.
Embodiment 2
Prepare steel die, be 1 according to mass ratio:100 ratio, weigh PAN bases chopped carbon fiber and aluminium sulfate water
Mud.
Pre-dispersed, first stirring at low speed 5min, then high-speed stirred 5min are carried out to chopped carbon fiber using glue sand agitator, is made
It is into monofilament shape.Proportionally pre-dispersed chopped carbon fiber, sulphate aluminium cement are placed in simpson mill successively and mixed
Close 25min.It is finally dry-pressing formed with 50MPa pressure, Carbon Fiber Cement-based Composites sample is formed, is conserved in water to complete
Pansclerosis.
Embodiment 3
Prepare steel die, be 1 according to mass ratio:100 ratio, weigh PAN bases chopped carbon fiber and aluminium sulfate water
Mud.
Pre-dispersed, first stirring at low speed 5min, then high-speed stirred 5min are carried out to chopped carbon fiber using glue sand agitator, is made
It is into monofilament shape.Proportionally pre-dispersed chopped carbon fiber, sulphate aluminium cement are placed in simpson mill successively and mixed
Close 20min.It is finally dry-pressing formed with 60MPa pressure, Carbon Fiber Cement-based Composites sample is formed, is conserved in water to complete
Pansclerosis.
Embodiment 4
Prepare steel die, be 1 according to mass ratio:100 ratio, weigh PAN bases chopped carbon fiber and aluminium sulfate water
Mud.
Pre-dispersed, first stirring at low speed 5min, then high-speed stirred 5min are carried out to chopped carbon fiber using glue sand agitator, is made
It is into monofilament shape.Proportionally pre-dispersed chopped carbon fiber, sulphate aluminium cement are placed in simpson mill successively and mixed
Close 25min.It is finally dry-pressing formed with 60MPa pressure, Carbon Fiber Cement-based Composites sample is formed, is conserved in water to complete
Pansclerosis.
As shown in fig.1, the compressive strength rate moulding by casting for the Carbon Fiber Cement-based Composites that the present invention obtains obtains
Carbon Fiber Cement-based Composites and striaght cement compression strength it is high.
As shown in fig.2, what the porosity for the Carbon Fiber Cement-based Composites that the present invention obtains obtained than moulding by casting
The porosity of Carbon Fiber Cement-based Composites is small, and reduces with the increase of briquetting pressure.
As shown in fig.3, what the Conductivity Ratio moulding by casting for the Carbon Fiber Cement-based Composites that the present invention obtains obtained
The high 4-6 order of magnitude of electrical conductivity of Carbon Fiber Cement-based Composites.
One embodiment of the present invention is the foregoing is only, is not all of or unique embodiment, this area is common
Technical staff is the present invention by reading description of the invention any equivalent conversion for taking technical solution of the present invention
Claim covered.
Claims (9)
1. a kind of method that dry-mixed dry-pressing prepares Carbon Fiber Cement-based Composites, it is characterised in that first by chopped carbon fiber
It is pre-dispersed into monofilament shape, it is then dry-mixed uniformly and directly dry-pressing formed together with other raw materials, first sample is impregnated with completely with water
And precuring is carried out in the wet environment, precuring insufficient the problem of producing micro-crack is effectively avoided, then again in water
It is middle to conserve to fully hardened.
2. the method that dry-mixed dry-pressing prepares Carbon Fiber Cement-based Composites according to claim 1, it is characterised in that described
Chopped carbon fiber is PAN bases, asphaltic base or viscose base.
3. the method that dry-mixed dry-pressing according to claim 1 or claim 2 prepares Carbon Fiber Cement-based Composites, it is characterised in that
The chopped carbon fiber length is 5-10mm.
4. the method that dry-mixed dry-pressing according to claim 1 or claim 2 prepares Carbon Fiber Cement-based Composites, it is characterised in that
Other described raw materials are：
Sulphate aluminium cement；Or
Portland cement；Or
The mixture of sulphate aluminium cement and aggregate；Or
The mixture of portland cement and aggregate.
5. the method that dry-mixed dry-pressing prepares Carbon Fiber Cement-based Composites according to claim 4, it is characterised in that described
Addition of the chopped carbon fiber in Carbon Fiber Cement-based Composites is sulphate aluminium cement quality used in composite
0.5-1.2% or portland cement quality 0.5-1.2%.
6. the method that dry-mixed dry-pressing according to claim 1 or claim 2 prepares Carbon Fiber Cement-based Composites, it is characterised in that
The chopped carbon fiber is dispersed into monofilament shape with glue sand agitator, is mixed with other raw materials in simpson mill, in water
Conserve to fully hardened.
7. the method that dry-mixed dry-pressing prepares Carbon Fiber Cement-based Composites according to claim 6, it is characterised in that described
During pre-dispersed chopped carbon fiber, glue sand agitator elder generation stirring at low speed 5min, then high-speed stirred 5min.
8. the method that dry-mixed dry-pressing prepares Carbon Fiber Cement-based Composites according to claim 6, it is characterised in that described
Chopped carbon fiber and other raw materials mixed in simpson mill 20-25min realize it is dry-mixed.
9. the method that dry-mixed dry-pressing prepares Carbon Fiber Cement-based Composites according to claim 6, it is characterised in that described
It is dry-pressing formed, it is the typed pressure that the mixed raw material of simpson mill is applied to 20-60MPa in steel die, shaping
Press time is 30-60s.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610240948.3A CN105884305B (en) | 2016-04-18 | 2016-04-18 | A kind of method that dry-mixed dry-pressing prepares Carbon Fiber Cement-based Composites |
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| CN106587860B (en) * | 2016-12-06 | 2020-05-12 | 西安建筑科技大学 | Method for improving Seebeck coefficient of cement-based composite material by using transition metal oxide |
| CN106747140B (en) * | 2016-12-16 | 2019-05-10 | 西安建筑科技大学 | A method of improving Carbon Fiber Cement-based Composites Seebeck coefficient |
| CN109867493A (en) * | 2019-04-11 | 2019-06-11 | 重庆科技学院 | Vinal dispersion technology and its application |
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| JPH03197344A (en) * | 1989-12-27 | 1991-08-28 | Showa Shell Sekiyu Kk | Production of carbon fiber-reinforced dry mortar and mortar coating material |
| JPH06172002A (en) * | 1992-12-03 | 1994-06-21 | Toto Ltd | Fiber-reinforced press molded article of cement |
| JPH06263494A (en) * | 1993-03-04 | 1994-09-20 | Mitsui Mining Co Ltd | Carbon short fiber dispersed composition and production of cfrc using the same |
| CN100367022C (en) * | 2005-03-09 | 2008-02-06 | 湖南科技大学 | Intelligent concrete test block and its producing and use |
| CN101602590A (en) * | 2009-06-30 | 2009-12-16 | 武汉理工大学 | In mix CCCW carbon fiber and graphite sensitive concrete and application thereof |
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