CN107382180A - A kind of high ductility enhanced water resistance cement-base composite material of high intensity and preparation method thereof - Google Patents
A kind of high ductility enhanced water resistance cement-base composite material of high intensity and preparation method thereof Download PDFInfo
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- CN107382180A CN107382180A CN201710437652.5A CN201710437652A CN107382180A CN 107382180 A CN107382180 A CN 107382180A CN 201710437652 A CN201710437652 A CN 201710437652A CN 107382180 A CN107382180 A CN 107382180A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B16/00—Use of organic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of organic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B16/04—Macromolecular compounds
- C04B16/06—Macromolecular compounds fibrous
- C04B16/0616—Macromolecular compounds fibrous from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C04B16/0641—Polyvinylalcohols; Polyvinylacetates
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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
- 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
- C04B20/023—Chemical treatment
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/30—Adapting or protecting infrastructure or their operation in transportation, e.g. on roads, waterways or railways
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- Inorganic Chemistry (AREA)
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- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses high ductility enhanced water resistance cement-base composite material of a kind of high intensity and preparation method thereof, the material includes following components：Modified polyvinyl alcohol fabric, sand, cement, silicon ash, consistency modifiers, flyash, slag, silicon ash dispersed modifier, water and water reducer；Its preparation method is as follows：1) it is soluble in water that silicon ash dispersed modifier, water reducer are weighed in proportion, are configured to mixed solution；2) silicon ash is added in mixed solution, stirring obtains mixture slurry I；3) cement, consistency modifiers, flyash, slag, sand are sequentially added into mixture slurry I, stirring obtains mixture slurry II；4) modified polyvinyl alcohol fabric is added into mixture slurry II, stirring obtains mixture slurry III；5) by the injection molding vibration moulding of mixture slurry III, the demoulding, maintenance are stood.The present invention realizes the perfect matching between fiber and high compact basal body interface, has the building structure of high requirement to provide a kind of new material intensity and ductility for those.
Description
Technical field
The present invention relates to high ductility enhanced water resistance cement-base composite material of a kind of high intensity and preparation method thereof, belong to high-strength
Spend high ductility enhanced water resistance building material technical field.
Background technology
For concrete as most widely used construction material, the status in daily life and the development of the national economy is to lift
Sufficient weight.To overcome the defects of intrinsic fragility of concrete is high, contraction is big, easy to crack, different types of fibre reinforced concrete should
With and give birth to, wherein it is most representational at the same be also it is most widely used be then very-high performance fiber reinforced cement-based composite material
It is (Ultra High Performance Fiber Reinforced Cementitious Composite, UHPFRCC) and high
Ductility cement-base composite material (Engineered Cementitious Composites, ECC), correspond respectively to steel fibre increasing
Strengthen with organic synthetic fibers by force, it is again most representative with polyvinyl alcohol (PVA) fiber in synthetic fibers.Vinal is
It is made up of the ethenol system high molecular polymer containing polyhydroxy, strong hydrogen bonding, molecular structural formula is as shown in Equation 1：
PVA fibers have excellent hydrophily, fibre forming property, surface as a small number of crystalline water-soluble high-molecular materials
Characteristic, resistance to acids and bases and mechanical property.No matter in the developed country such as China or America and Europe, fibre reinforced concrete has obtained extensively
General application, and special fibre reinforced concrete design rule have been put into effect in China, the U.S., European Union, Japan and other countries or area
Model.
Although steel fibre also has good activeness and quietness effect, it does not change the Embrittlement of concrete, crack
Quantity is few, and strain hardening effect is poor, and the limit ductility under tensile load seldom can exceed that 0.5%.Fundamentally to overcome coagulation
The defects of native ductility difference, the Victor Li of Univ Michigan-Ann Arbor USA etc., using PVA fibers as reinforcing material, is prepared for a kind of ECC,
And propose the design theory of the material.The strain hardening stretching ductility of the material reaches more than 3%, and fracture width is less than 100 μ
M, the material compensate for the defects of cement-based material can not realize big strain, have landmark meaning in building material field
Justice, and in bridge, skyscraper etc., some have taken the material to the engineering structure part that ductility and amount of deflection have high requirements
Obtained good using effect.ECC design theories are pointed out：In loading process, fiber is held jointly with matrix as an entirety
By load, the microcrack open width inside ECC reaches critical width or the stress intensity of crack tip reaches concrete
During matrix limit fracture toughness, crack will start unstable extension, pass through effective tune to fiber-matrix interfacial bond property
Control, it can make to remain to effective transmission and bearing load in withdrawal process of the fiber after unsticking, and new crack in the process
It is continuously generated, it is achieved thereby that the strain hardening effect that stress improves constantly.The addition of fiber not only inhibits concrete very well
Cracking, improve flexural tensile strength and ductility, and slow down split after (post-cracking) stress decrease speed.Except this it
Outside, the characteristic such as the antifatigue of ECC, thermic load, shock resistance, energy absorption, engineering safety coefficient is significantly increased.The addition of fiber
Effectively inhibit the formation of microcrack and block the extension of crackle, act on and absorb a large amount of so as to serve good cracking resistance
Energy.Common plain concrete is damaged rapidly if flexural tensile strength is gone beyond the limit of, and for ECC, slurry is bonded after hardening
High-intensity fiber silk counterincision is sewed with snap action, and the hardening block implication to separation acts on, and makes coagulation soil cracking without disconnected, and can enter
One step bearing load, even if burst damage, safety coefficient will not also occur when load is more than the ultimate load that ECC can bear
Significantly improve.Although ECC has the advantages of many unique, there is the defects of lower compressive strength in existing ECC, its resistance to compression
Intensity is almost not above 100MPa, existing for those for intensity and ductility have the building structure of high requirement
ECC can not still meet structural requirement.Existing ECC, once there is crack generation, presss from both sides there is also the shortcomings that water proofing property deficiency simultaneously
The outside moisture of miscellaneous different harmful substances will the reinforcing bar part that is coated to ECC of rapid osmotic, accelerate reinforcing bar rust, use the longevity
Life shortens.Therefore, while holding ECC high ductility, its intensity and water resistance how to be improved as study hotspot in recent years.
The core of ECC design theories is to require, in the case where ensureing that fiber is dispersed, to glue fiber-matrix interface
Tie performance and carry out Effective Regulation, the performance between fiber, matrix, interface three is matched, so as to realize strain hardening.Interface
Adhesion strength dominates many important composite attributes such as ECC bulk strength, ductility, energy absorption.Fiber-matrix
Interfacial stress be divided into chemical bonding stress and interface friction stress.To obtain good fiber -- basal body interface adhesive property,
Most of scholar is directed to how increasing the hydrophily (chemical modification method) of fiber surface and increases the surface area (physics of fiber
Method of modifying), so as to improve the interface binding intensity and compatibility between fiber and matrix.The method of modifying of chemistry such as, utilizes
Polar group is led to fiber surface to increase the reactivity of fiber and wetability by corona treatment, and it is different types of can
To increase use of the hydrophilic surface modifier of fiber surface etc.；The method of modifying of physics such as, is distorted to fiber, embossed
Crimping, roughening and end hook etc. is introduced into fiber change fiber apparent form and glued with the mechanicalness improved between fiber and matrix
Tie the 3D shape processing mode of performance.But the physical or chemical treatment method of modifying carried out in itself to fiber is typically only applicable
In low grade ECC preparation, because too high interface binding intensity may cause fibre debonding, power consumption is larger, and fiber may
Do not extract and just suffer from major injury, few fibers may be directly pulled off, and greatly reduced fiber and transmitted in withdrawal process
With the ability of bearing load, the ductility for as a result instead resulting in ECC is had a greatly reduced quality.And these method of modifying are fine by changing
The surface state of itself is tieed up to increase the adhesion strength between fiber and matrix, and whether have ignored can be by increasing matrix
Compactness is to increase the Research Thinking of adhesion strength.In the range of the ultimate tensile strength that fiber can be born, increase matrix is closely knit
Degree can not only improve the contact area of matrix and fiber so as to improve interfacial mechanical friction stree, but also can effectively carry
High ECC composite compression-resisting intensity.But if simply improving the compactness of matrix simply, closely knit spend may be caused on the contrary
Height, bonds that inner power is too high, and fiber is not drawn out easily suffered by fiber, although compression strength improves, ductility declines on the contrary.
Prior art Patent 201210468413.3 provides a kind of preparation method of high crack-resisting, but the patent
It is by being coated with Engine oil agent in PVA fiber surfaces to improve the hydrophily of fiber surface, and then reinforcing fiber and cement matrix
Interfacial bond property, the 28d compression strength highest of material prepared by the method also only has 35MPa, and maximum tension ductility does not surpass
Cross 100 microstrains namely 0.01%.Whether mechanism of modification, or material property, patent 201210468413.3 and sheet
Invention is all completely different.
The content of the invention
Technical problem：It is an object of the invention to provide a kind of high ductility enhanced water resistance cement-base composite material of high intensity and its
Preparation method, solves the defects of existing high ductility cement-base composite material low strength, poor water resistance.
Technical scheme：The invention provides a kind of high ductility enhanced water resistance cement-base composite material of high intensity, the cement base
Composite includes following components：Modified polyvinyl alcohol fabric, cement, silicon ash, consistency modifiers, flyash, slag, sand,
Silicon ash dispersed modifier, water and water reducer, the weight/mass percentage composition of each component are as follows：
Wherein：
Kang pressure Du≤100MPa of the high ductility enhanced water resistance cement-base composite material of high intensity, uniaxial tension load
Under Yan≤3%, 100 μm of the low ＜ of average crack width.
Described modified polyvinyl alcohol fabric be by by vinal immerse substance withdrawl syndrome be 0.02~
2~4h in 0.04mol/L silane coupler solution, cooling is taken out afterwards and dries obtained, described silane coupler solution
Temperature is 50 DEG C~70 DEG C.
The length of described vinal is 6mm~12mm, a diameter of 12~38 μm, Dan Mo Liang≤35GPa, pole
Limit Kang La Qiang Du≤1400MPa, elongation at break 3~7%.
Described silane coupler is alkyl silane, amino silane, epoxy radicals silicone hydride, vinyl silanes, phenyl silane, first
One or more mixed solutions in base acryloxy silane, isocyanatosilanes or silicon fluoride.
Described cement is marked as 52.5 grades portland cements；Described silicon ash is commercially available common silicon ash, its SiO2's
Mass content is more than 92%；Described slag is commercially available high-quality slag；Described consistency modifiers are commercially available high-quality denseness regulation
Agent.
Described flyash is high-quality F classes I level Class F fly ash, the wherein mass content of free CaO<1%；Described sand
Son is common river sand, and maximum particle diameter is not more than 1200 μm；Described water reducer is poly carboxylic acid series water reducer, its solid content >=
40%, water-reducing rate >=40%.
Described silicon ash dispersed modifier is commercially available high quality silicon ash dispersed modifier.
Present invention also offers a kind of preparation method of the high ductility enhanced water resistance cement-base composite material of high intensity, this method
Comprise the following steps：
1) weigh silicon ash dispersed modifier in proportion, water reducer is dissolved in mixing water, be configured to mixed solution；
2) silicon ash is added in the mixed solution that step 1) is prepared, stirring obtains mixture slurry I；
3) cement, consistency modifiers, flyash, slag, sand are sequentially added into mixture slurry I, stirring is mixed
Slurry II；
4) modified polyvinyl alcohol fabric is added into mixture slurry II, stirring obtains mixture slurry III；
5) by the injection molding vibration moulding of mixture slurry III after, stand after being stripped through conserving to obtain the high ductility enhanced water resistance of high intensity
Cement-base composite material.
Wherein：
Stirring described in step 2) obtains mixture slurry I and refers to stir 1~2min with 140~170r/min rotating speed, obtains
To mixture slurry I；
Stirring described in step 3) obtains mixture slurry II and refers to stir 1~2min with 140~170r/min rotating speed, then
2~4min is stirred with 285~310r/min rotating speed, obtains mixture slurry II；
Stirring described in step 4) obtains mixture slurry III and refers to stir 1~2min with 140~170r/min rotating speed, then
4~6min is stirred with 285~310r/min rotating speed, obtains mixture slurry III；
The time of the standing demoulding described in step 5) is 12~24h, and the condition of described maintenance is under the conditions of 20 ± 2 DEG C
28 ± 2 days or 60 DEG C~90 DEG C of standard curing steam curing 5~8 days.
Beneficial effect：Compared with prior art, the present invention has the advantage that：
1) present invention effectively raises matrix compactness based on concrete theory of high packing；
2) present invention proposes a kind of new PVA fiber tables matching with high compact matrix, that strain hardening can be achieved
Face modification technology, by the Effective Regulation to fiber-matrix interfacial bond property successfully prepare a kind of Kang pressure Du≤
100MPa, Yan≤3% under uniaxial tension load, while there is the high ductility enhanced water resistance cement of high intensity of good water resistance
Based composites；
3) achievement in research compensate for that the high ductility cement-based material of high intensity can not be prepared by PVA fibers both at home and abroad
Blank, the beginning that the high ductility concrete of high intensity is prepared using PVA fibers is started.
Brief description of the drawings
Fig. 1 is surface contact angle before PVA fibre modifications in embodiment 5,
Fig. 2 is surface contact angle after PVA fibre modifications in embodiment 5,
Fig. 3 is cement-base composite material uniaxial tension result when unmodified fibers are added in embodiment 5,
Fig. 4 is cement-base composite material uniaxial tension result when modified fibre is added in embodiment 5.
Embodiment
This research is based on concrete theory of high packing, by increasing matrix compactness to improve fiber -- matrix circle
Face adhesion strength, the Research Thinking novel and unique.The particle theory of high packing of concrete is to enter the raw material of different scale
The accurate mix-design of row, so that the particle of the different raw material in submicroscopic range scale forms closestpacking with most
The reduction porosity of big degree；And common high performance concrete relies primarily on the larger active admixture of incorporation specific surface area and come
Play a role, fail to be formed between particle tightly packed.By what is developed in the present invention based on theory of high packing
Matrix is excessively closely knit, in order to ensure hydrophilic PVA fibers can be stablized in the matrix of such high compact extraction, originally grinds
Study carefully and act in a diametrically opposite way, hydrophilic PVA fibers are subjected to hydrophobic treatment.Coupling agent is a kind of containing heterogeneity functional group
Chemical substance, caused hydrophilic radical can occur condensation reaction with the hydroxy functional group in fiber and form covalent bond after it is hydrolyzed,
So as to which coupling agent molecule is firmly anchored on into fiber surface, the outside of fiber is stretched in hydrophobic functional group caused by hydrolysis,
The close and distant water state on vinal surface with this Effective Regulation, so as to Effective Regulation between fiber and high compact matrix
Interphase match degree, make the easy unsticking of PVA fibers, effectively reduce the cutting and damage because of chemical unsticking and to fiber in itself,
It ensure that fiber greatly can transmit and undertake stress in withdrawal process.Meanwhile the high compact to match with modified PVA fiber
The stress that matrix is undertaken can also be converted in a manner of the sliding friction power consumption during spike protein gene as far as possible, from
And make fiber power consumption occur as far as possible fiber slippage extract during rather than unsticking moment.And in the process of mix
In, the wet-mixing slurry of high compact can provide more effective shear stress, fiber is realized evenly scattered.The present invention is to base
Body and fiber optimize simultaneously, not only ensure that prepared concrete has very high compression strength, it is often more important that tool
There is high strain hardening stretching ductility.And after the PVA fibers carried out after hydrophobic treatment cause ECC surfaces and produce crack
Cracking face there is certain hydrophobicity, can effectively prevent the intrusion of external solution, protection inside concrete reinforcing bar from corrosion,
Efficiently solve the problems, such as waterproof, the antirust of bent member.By lot of experiments, the present invention successfully prepares compression strength and surpassed
100MPa is crossed, strain hardening stretching ductility has the high-strength superelevation ductility enhanced water resistance coagulation of good water resistance more than 3%
Soil.
The present invention is further illustrated below by embodiment.
Uniaxial tension, compression strength, rupture strength test：Reference《High ductility fiber reinforced cement-based composite material performance
Test method (draft)》In relevant test method be measured.
Water resistance is indicated by water absorption rate, frost resistance, with reference to JGJ/T 70-2009《Building mortar basic performance is tried
Test method standard》In relevant test method be measured.
Embodiment 1：
A kind of high ductility enhanced water resistance cement-base composite material of high intensity, including following components：Modified polyvinyl alcohol fabric,
Cement, silicon ash, consistency modifiers, flyash, slag, sand, silicon ash dispersed modifier, water and water reducer, the quality of each component
Percentage composition is as follows：Modified polyvinyl alcohol fabric is 1.0%, cement 39%, silicon ash 8%, consistency modifiers 3%, powder
Coal ash is 4%, slag 11%, sand 16%, water 15%, and silicon ash dispersed modifier is 0.035%, water reducer 2.965%.
The preparation of modified PVA fiber：It is molten that PVA fibers are immersed into the silane coupler that substance withdrawl syndrome is 0.04mol/L
2h in liquid, the temperature that obtained, described silane coupler solution is dried in taking-up cooling afterwards are 50 DEG C.
A kind of preparation method of the high ductility enhanced water resistance cement-base composite material of high intensity is as follows：
1) it is soluble in water that silicon ash dispersed modifier, water reducer are weighed in proportion, are configured to mixed solution；
2) silicon ash is added in the mixed solution that step 1) is prepared, 1min is stirred with 140r/min rotating speed, mixed
Slurry I；
3) cement, consistency modifiers, flyash, slag, sand are sequentially added into mixture slurry I, with 170r/min's
Rotating speed stirs 2min, then stirs 2min with 285r/min rotating speed, obtains mixture slurry II；
4) modified polyvinyl alcohol fabric is added into mixture slurry II, with 140r/min rotating speed stirring 1min, then with
285r/min rotating speed stirring 4min, obtains mixture slurry III；
5) by the injection molding vibration moulding of mixture slurry III after, it is stripped, 60 DEG C of steam curing 8 days, produces described after standing 12
The high ductility enhanced water resistance cement-base composite material of high intensity.
Embodiment 2：
A kind of high ductility enhanced water resistance cement-base composite material of high intensity, including following components：Modified polyvinyl alcohol fabric,
Cement, silicon ash, consistency modifiers, flyash, slag, sand, silicon ash dispersed modifier, water and water reducer, the quality of each component
Percentage composition is as follows：Modified polyvinyl alcohol fabric is 1.2%, cement 26.8%, silicon ash 9%, consistency modifiers 8%,
Flyash is 12%, slag 5%, sand 21%, water 14%, and silicon ash dispersed modifier is 0.057%, water reducer 2.943%.
The preparation of modified PVA fiber：It is molten that PVA fibers are immersed into the silane coupler that substance withdrawl syndrome is 0.03mol/L
3h in liquid, the temperature that obtained, described silane coupler solution is dried in taking-up cooling afterwards are 60 DEG C.
A kind of preparation method of the high ductility enhanced water resistance cement-base composite material of high intensity is as follows：
1) it is soluble in water that silicon ash dispersed modifier, water reducer are weighed in proportion, are configured to mixed solution；
2) silicon ash is added in the mixed solution that step 1) is prepared, 1min is stirred with 150r/min rotating speed, mixed
Slurry I；
3) cement, consistency modifiers, flyash, slag, sand are sequentially added into mixture slurry I, with 160r/min's
Rotating speed stirs 1min, then stirs 3min with 295r/min rotating speed, obtains mixture slurry II；
4) modified polyvinyl alcohol fabric is added into mixture slurry II, with 140r/min rotating speed stirring 1min, then with
285r/min rotating speed stirring 5min, obtains mixture slurry III；
5) by the injection molding vibration moulding of mixture slurry III after, it is stripped after standing 18h, the standard curing 28 under the conditions of 20 DEG C
My god, produce the high ductility enhanced water resistance cement-base composite material of the high intensity.
Embodiment 3：
A kind of high ductility enhanced water resistance cement-base composite material of high intensity, including following components：Modified polyvinyl alcohol fabric,
Cement, silicon ash, consistency modifiers, flyash, slag, sand, silicon ash dispersed modifier, water and water reducer, the quality of each component
Percentage composition is as follows：Modified polyvinyl alcohol fabric is 1.5%, cement 24.5%, silicon ash 15%, and consistency modifiers are
11%, flyash 7%, slag 6%, sand 18%, water 14%, silicon ash dispersed modifier is 0.049%, and water reducer is
2.951%.
The preparation of modified PVA fiber：It is molten that PVA fibers are immersed into the silane coupler that substance withdrawl syndrome is 0.02mol/L
4h in liquid, the temperature that obtained, described silane coupler solution is dried in taking-up cooling afterwards are 70 DEG C.
A kind of preparation method of the high ductility enhanced water resistance cement-base composite material of high intensity is as follows：
1) it is soluble in water that silicon ash dispersed modifier, water reducer are weighed in proportion, are configured to mixed solution；
2) silicon ash is added in the mixed solution that step 1) is prepared, 2min is stirred with 160r/min rotating speed, mixed
Slurry I；
3) cement, consistency modifiers, flyash, slag, sand are sequentially added into mixture slurry I, with 150r/min's
Rotating speed stirs 1min, then stirs 3min with 310r/min rotating speed, obtains mixture slurry II；
4) modified polyvinyl alcohol fabric is added into mixture slurry II, with 150r/min rotating speed stirring 2min, then with
295r/min rotating speed stirring 5min, obtains mixture slurry III；
5) by the injection molding vibration moulding of mixture slurry III after, it is stripped, 70 DEG C of steam curing 7 days, produces described after standing 24h
The high ductility enhanced water resistance cement-base composite material of high intensity.
Embodiment 4：
A kind of high ductility enhanced water resistance cement-base composite material of high intensity, including following components：Modified polyvinyl alcohol fabric,
Cement, silicon ash, consistency modifiers, flyash, slag, sand, silicon ash dispersed modifier, water and water reducer, the quality of each component
Percentage composition is as follows：Modified polyvinyl alcohol fabric is 1.3%, cement 28.7%, silicon ash 18%, consistency modifiers 5%,
Flyash is 7%, slag 6%, sand 15%, water 16%, and silicon ash dispersed modifier is 0.053%, water reducer 2.947%.
The preparation of modified PVA fiber：It is molten that PVA fibers are immersed into the silane coupler that substance withdrawl syndrome is 0.025mol/L
2h in liquid, the temperature that obtained, described silane coupler solution is dried in taking-up cooling afterwards are 55 DEG C.
A kind of preparation method of the high ductility enhanced water resistance cement-base composite material of high intensity is as follows：
1) it is soluble in water that silicon ash dispersed modifier, water reducer are weighed in proportion, are configured to mixed solution；
2) silicon ash is added in the mixed solution that step 1) is prepared, 2min is stirred with 170r/min rotating speed, mixed
Slurry I；
3) cement, consistency modifiers, flyash, slag, sand are sequentially added into mixture slurry I, with 140r/min's
Rotating speed stirs 2min, then stirs 4min with 310r/min rotating speed, obtains mixture slurry II；
4) modified polyvinyl alcohol fabric is added into mixture slurry II, with 160r/min rotating speed stirring 2min, then with
310r/min rotating speed stirring 6min, obtains mixture slurry III；
5) by the injection molding vibration moulding of mixture slurry III after, it is stripped, 80 DEG C of steam curing 6 days, produces described after standing 21h
The high ductility enhanced water resistance cement-base composite material of high intensity.
Embodiment 5：
A kind of high ductility enhanced water resistance cement-base composite material of high intensity, including following components：Modified polyvinyl alcohol fabric,
Cement, silicon ash, consistency modifiers, flyash, slag, sand, silicon ash dispersed modifier, water and water reducer, the quality of each component
Percentage composition is as follows：Modified polyvinyl alcohol fabric is 1.4%, cement 29.6%, silicon ash 7%, consistency modifiers 5%,
Flyash is 14%, slag 3%, sand 24%, water 13%, and silicon ash dispersed modifier is 0.042%, water reducer 2.958%.
The preparation of modified PVA fiber：It is molten that PVA fibers are immersed into the silane coupler that substance withdrawl syndrome is 0.035mol/L
3h in liquid, the temperature that obtained, described silane coupler solution is dried in taking-up cooling afterwards are 65 DEG C.
A kind of preparation method of the high ductility enhanced water resistance cement-base composite material of high intensity is as follows：
1) it is soluble in water that silicon ash dispersed modifier, water reducer are weighed in proportion, are configured to mixed solution；
2) silicon ash is added in the mixed solution that step 1) is prepared, 1min is stirred with 170r/min rotating speed, mixed
Slurry I；
3) cement, consistency modifiers, flyash, slag, sand are sequentially added into mixture slurry I, with 140r/min's
Rotating speed stirs 2min, then stirs 4min with 295r/min rotating speed, obtains mixture slurry II；
4) modified polyvinyl alcohol fabric is added into mixture slurry II, with 170r/min rotating speed stirring 2min, then with
310r/min rotating speed stirring 6min, obtains mixture slurry III；
5) by the injection molding vibration moulding of mixture slurry III after, it is stripped, 90 DEG C of steam curing 5 days, produces described after standing 15h
The high ductility enhanced water resistance cement-base composite material of high intensity.
Relevant parameter test result is as shown in table 1.
Table 1
The result of table 1 is shown：The properties of the high ductility enhanced water resistance cement-base composite material of high intensity prepared by the present invention
Excellent, intensity is more than 100MPa, and ductility reaches more than 3%, and water resistance is excellent, and the achievement in research compensate for not leading to both at home and abroad
Cross the blank that PVA prepares the high ductility concrete of high intensity.
The foregoing is only a specific embodiment of the invention, but protection scope of the present invention is not limited thereto, any
Those skilled in the art disclosed herein technical scope in, can without the change that creative work is expected or
Replace, should all be included within the scope of the present invention.Therefore, protection scope of the present invention should be limited with claims
Fixed protection domain is defined.
Claims (10)
- A kind of 1. high ductility enhanced water resistance cement-base composite material of high intensity, it is characterised in that：The cement-base composite material includes Following components：Modified polyvinyl alcohol fabric, cement, silicon ash, consistency modifiers, flyash, slag, sand, silicon ash disperse modified Agent, water and water reducer, the weight/mass percentage composition of each component are as follows：
- A kind of 2. high ductility enhanced water resistance cement-base composite material of high intensity as claimed in claim 1, it is characterised in that：It is described Kang pressure Du≤100MPa of the high ductility enhanced water resistance cement-base composite material of high intensity, Yan under uniaxial tension load≤ 3%, 100 μm of the low ＜ of average crack width.
- A kind of 3. high ductility enhanced water resistance cement-base composite material of high intensity as claimed in claim 1, it is characterised in that：It is described Modified polyvinyl alcohol fabric be by by vinal immerse substance withdrawl syndrome be 0.02~0.04mol/L silane 2~4h in coupling agent solution, the temperature that obtained, described silane coupler solution is dried in taking-up cooling afterwards are 50 DEG C~70 ℃。
- A kind of 4. high ductility enhanced water resistance cement-base composite material of high intensity as claimed in claim 3, it is characterised in that：It is described The length of vinal be 6mm~12mm, a diameter of 12~38 μm, bullet property mould amount≤35GPa, Ultimate Tensile intensity≤ 1400MPa, elongation at break 3~7%.
- A kind of 5. high ductility enhanced water resistance cement-base composite material of high intensity as claimed in claim 3, it is characterised in that：It is described Silane coupler for alkyl silane, amino silane, epoxy radicals silicone hydride, vinyl silanes, phenyl silane, methacryloxy One or more mixed solutions in silane, isocyanatosilanes or silicon fluoride.
- A kind of 6. high ductility enhanced water resistance cement-base composite material of high intensity as claimed in claim 1, it is characterised in that：It is described Cement be marked as 52.5 grades portland cements；Described silicon ash is commercially available common silicon ash, its SiO2Mass content be more than 92%；Described slag is commercially available high-quality slag；Described consistency modifiers are commercially available high-quality consistency modifiers.
- A kind of 7. high ductility enhanced water resistance cement-base composite material of high intensity as claimed in claim 1, it is characterised in that：It is described Flyash be high-quality F classes I level Class F fly ash, the wherein mass content of free CaO<1%；Described sand is common river Sand, maximum particle diameter are not more than 1200 μm；Described water reducer is poly carboxylic acid series water reducer, its solid content >=40%, water-reducing rate >= 40%.
- A kind of 8. high ductility enhanced water resistance cement-base composite material of high intensity as claimed in claim 1, it is characterised in that：It is described Silicon ash dispersed modifier be commercially available high quality silicon ash dispersed modifier.
- 9. a kind of preparation method of the high ductility enhanced water resistance cement-base composite material of high intensity as claimed in claim 1, it is special Sign is：This method comprises the following steps：1) it is soluble in water that silicon ash dispersed modifier, water reducer are weighed in proportion, are configured to mixed solution；2) silicon ash is added in the mixed solution that step 1) is prepared, stirring obtains mixture slurry I；3) cement, consistency modifiers, flyash, slag, sand are sequentially added into mixture slurry I, stirring obtains mixture slurry Ⅱ；4) modified polyvinyl alcohol fabric is added into mixture slurry II, stirring obtains mixture slurry III；5) by the injection molding vibration moulding of mixture slurry III after, stand after being stripped through conserving to obtain the high ductility enhanced water resistance cement of high intensity Based composites.
- 10. a kind of preparation method of the high ductility enhanced water resistance cement-base composite material of high intensity as claimed in claim 9, it is special Sign is：Stirring described in step 2) obtains mixture slurry I and refers to stir 1~2min with 140~170r/min rotating speed, obtains Mixture slurry I；Stirring described in step 3) obtains mixture slurry II and refers to stir 1~2min with 140~170r/min rotating speed, 2~4min is stirred with 285~310r/min rotating speed again, obtains mixture slurry II；Stirring described in step 4) obtains mixing slurry Body III refers to stir 1~2min with 140~170r/min rotating speed, then stirs 4~6min with 285~310r/min rotating speed, Obtain mixture slurry III；The time of the standing demoulding described in step 5) is 12~24h, and the condition of described maintenance is 20 ± 2 28 ± 2 days or 60 DEG C~90 DEG C of standard curing steam curing 5~8 days under the conditions of DEG C.
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| CN108249798A (en) * | 2018-01-11 | 2018-07-06 | 东南大学 | A kind of method of modifying of vinal for high ductility cement-base composite material |
| CN108298853A (en) * | 2018-01-11 | 2018-07-20 | 东南大学 | A kind of method of modifying of vinal for strain hardening cement-base composite material |
| CN109098084A (en) * | 2018-09-03 | 2018-12-28 | 南京交通职业技术学院 | A kind of Steel Bridge Deck Pavement and preparation method thereof |
| CN109626917A (en) * | 2019-02-20 | 2019-04-16 | 西安天盛混凝土有限公司 | A kind of C70 concrete and preparation method thereof |
| CN110526631A (en) * | 2019-09-18 | 2019-12-03 | 武汉大学 | Fly ash-based geopolymer material and preparation method thereof for solidifying chromium slag |
| CN113105163A (en) * | 2020-03-18 | 2021-07-13 | 殷石 | High-strength modified synthetic fiber reinforced high-ductility concrete |
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| CN116597926A (en) * | 2023-06-02 | 2023-08-15 | 山东大学 | Design system and method for high-ductility cement-based repair material for dichotomy crack development |
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| CN108249798A (en) * | 2018-01-11 | 2018-07-06 | 东南大学 | A kind of method of modifying of vinal for high ductility cement-base composite material |
| CN108298853A (en) * | 2018-01-11 | 2018-07-20 | 东南大学 | A kind of method of modifying of vinal for strain hardening cement-base composite material |
| CN108298853B (en) * | 2018-01-11 | 2021-01-12 | 东南大学 | Modification method of polyvinyl alcohol fiber for strain hardening cement-based composite material |
| CN108249798B (en) * | 2018-01-11 | 2021-01-12 | 东南大学 | Modification method of polyvinyl alcohol fiber for high-ductility cement-based composite material |
| CN109098084A (en) * | 2018-09-03 | 2018-12-28 | 南京交通职业技术学院 | A kind of Steel Bridge Deck Pavement and preparation method thereof |
| CN109626917A (en) * | 2019-02-20 | 2019-04-16 | 西安天盛混凝土有限公司 | A kind of C70 concrete and preparation method thereof |
| CN110526631A (en) * | 2019-09-18 | 2019-12-03 | 武汉大学 | Fly ash-based geopolymer material and preparation method thereof for solidifying chromium slag |
| CN110526631B (en) * | 2019-09-18 | 2021-05-04 | 武汉大学 | Fly ash-based geopolymer material for solidifying chromium slag and preparation method thereof |
| CN113105163A (en) * | 2020-03-18 | 2021-07-13 | 殷石 | High-strength modified synthetic fiber reinforced high-ductility concrete |
| CN114702282A (en) * | 2021-06-03 | 2022-07-05 | 何林锋 | Sound absorption and noise reduction concrete |
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| CN113200727A (en) * | 2021-06-24 | 2021-08-03 | 郑州大学 | Method for improving rheological property of PVA fiber and nano-silica cement-based composite material |
| CN116143459A (en) * | 2023-03-03 | 2023-05-23 | 成都源盟石油科技有限公司 | Elastic and tough cement paste and preparation method thereof |
| CN116597926A (en) * | 2023-06-02 | 2023-08-15 | 山东大学 | Design system and method for high-ductility cement-based repair material for dichotomy crack development |
| CN116597926B (en) * | 2023-06-02 | 2024-02-23 | 山东大学 | Design system and method for high-ductility cement-based repair material for dichotomy crack development |
| CN116768572A (en) * | 2023-06-27 | 2023-09-19 | 深圳大学 | ECC (error correction code) with hydrophobic performance and preparation method thereof |
| CN118063172A (en) * | 2024-04-22 | 2024-05-24 | 山东大学 | Anti-penetration ultra-high performance concrete based on silane modification and preparation method and application thereof |
| CN118063172B (en) * | 2024-04-22 | 2024-06-18 | 山东大学 | Anti-penetration ultra-high performance concrete based on silane modification and preparation method and application thereof |
| CN118145943A (en) * | 2024-05-10 | 2024-06-07 | 中国兵器工业北方勘察设计研究院有限公司 | Precast pile installation method |
| CN118145943B (en) * | 2024-05-10 | 2024-07-12 | 中国兵器工业北方勘察设计研究院有限公司 | Precast pile installation method |
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