CN106587686A - Metakaolin-based high-performance concrete composite admixture and application thereof - Google Patents
Metakaolin-based high-performance concrete composite admixture and application thereof Download PDFInfo
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- CN106587686A CN106587686A CN201611163711.6A CN201611163711A CN106587686A CN 106587686 A CN106587686 A CN 106587686A CN 201611163711 A CN201611163711 A CN 201611163711A CN 106587686 A CN106587686 A CN 106587686A
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- metakaolin
- concrete
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- base high
- performance composite
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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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
-
- 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
- C04B2111/20—Resistance against chemical, physical or biological attack
-
- 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
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/29—Frost-thaw resistance
-
- 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]
-
- 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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Landscapes
- 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)
Abstract
The invention discloses a metakaolin-based high-performance concrete composite admixture and application thereof. The composite admixture is prepared by mixing 30-40% of metakaolin, 10-20% of microspheres, 15-35% of II level fly ash and 15-35% of S75 mineral slag powder. The metakaolin-based high-performance concrete composite admixture takes the place of cement with the weight same as that of the metakaolin-based high-performance concrete composite admixture to be blended into a concrete gelling material, and the blending amount is 20%-30% of the total mass of the gelling material. High-titanium high-iron low-grade metakaolin is comprehensively used for preparation of the metakaolin-based high-performance concrete composite admixture, therefore, the compact deposit of particles, the ultra superimposing effect and the advantage complementary effect are achieved, the problem of water requirement brought about by the metakaolin as a single component and the problem of large friction force among gelling materials are solved, the blending property, mechanical property and durability of concrete are significantly improved, and the high performance of the concrete is achieved.
Description
Technical field
The present invention relates to composite blending material for concrete technical field.
Background technology
Since 2013, China pushes the application of technology of high performance concrete.The mineral admixture of high-quality not only can take
For cement, energy saving and reduction environmental pollution, also by composite cementitious material, induced activation effect, surface crystallitesization effect
Should, interface coupling effect, micro aggregate effect, significantly improve or improve mix physical performance, long-term strength, the long-term behaviour of concrete
And endurance quality, it is the functional component material for preparing high performance concrete.In the increasingly rare feelings of the mineral admixture of high-quality
Under condition, limited resource how is made full use of, the admixture for providing high-quality for high performance concrete is urgently to be resolved hurrily at present asking
Topic.
The content of the invention
It is an object of the invention to solve the deficiency of prior art presence, there is provided a kind of used by high performance concrete
High-quality admixture.
The purpose of the present invention is achieved through the following technical solutions：
A kind of metakaolin base high-performance composite blending material for concrete, by metakaolin, microballon, II level flyash, S75
Slag powders are mixed, and the mass percent of each component is respectively：Metakaolin 30%～40%, microballon 10%～20%, II
Level flyash 15%～35%, S75 slag powders 15%～35%.
Metakaolin of the present invention is that in atmosphere natural cooling is prepared from after calcining 2h at 850 DEG C by kaolin
Fe2O3And TiO2Gross mass content is 2%～4% low-quality metakaolin of high-Fe-Ti.The microballon is closely knit glass marble
Body powder body material, grain diameter D50≤2.5 μm.Grain diameter D50≤20 μm of the II levels flyash.The S75 slag powders
Grain diameter D50≤20 μm.
The application of metakaolin base high-performance composite blending material for concrete of the present invention, is the metakaolin base of the quality such as use
High performance concrete composite blend replaces cement to be incorporated in concrete gel material, and incorporation accounts for total Binder Materials quality
20%～30%.
In the composite blend of the present invention, metakaolin is that, with kaolin as raw material, Jing uniform temperature calcined dehydrations are formed
Anhydrous aluminium silicate, its molecules align is irregular, thermodynamics is presented and is situated between steady state, with higher pozzolanic activity, is added
It is added in concrete and is remarkably improved intensity, volume stability, durability and the corrosion resistance performance of concrete, realizes concrete
High performance.China's kaolin resource enriches very much, but the kaolin resource reserves of high-quality are few, for papermaking coating, finely
The industries such as chemical industry have natural limitations, many ferrotitaniums etc., and impurity content is higher, the low-grade kaolin that whiteness is low is not obtained fully
Utilize.Effective exploitation of the present invention and comprehensive utilization high-Fe-Ti metakaolin prepare high performance concrete, solve high-quality mineral and mix
Close the problem of material scarcity of resources.
Metakaolin belongs to stratiform disordered structure, and particle slabbing, hole is more, and specific surface area is big, and average grain diameter typically exists
Less than 10 μm, the frictional force that can increase between the water requiremen of concrete and Binder Materials is incorporated in concrete, and with volume
Increase and significantly increase, its popularization and application in concrete is limited to a certain extent.Microballon is that a kind of particle diameter continuously divides
The ultra micro glass spheres powder body material of cloth, average grain diameter typically below 3 μm, active high, water requirement is low, ball effect and
Filling effect, the viscosity that concrete mix can be significantly reduced and the durability for improving concrete.Flyash contains substantial amounts of glass
Glass microballon, ground slag powder is the fine and close glass particles of smooth texture, and average grain diameter can reduce coagulation typically at 20 μm or so
The water requiremen of soil, improves the service behaviour of fresh concrete, but early age strength of concrete is low.Various mineral admixtures are because of granulated
Impact of the otherness of looks, particle size and specific surface area to concrete performance differs greatly.It is polynary using admixture of the present invention
Composite optimization can realize closely knit with the space between the particle size range of Reasonable adjustment cementitious material system and reduction cement granules
Grain is piled up, the unit consumption of water of effective control concrete, improves the packing of hardened cement paste and improves the micro- of cement slurry
Structure is seen, the intensity and endurance quality of hardenite is increased substantially.
20 beginnings of the century, Andresen proposes a kind of accumulation based on continuous Size Distribution particle based on counting and be similar to
Theory, the theory is widely accepted and applies in studying in Binder Materials dense packing.20 century 70s, Dinger and
Funk is corrected, i.e. Dinger by distribution, introducing limited smallest particles dimension D min to Andreessen equations
With Funk equations, see formula (1).The equation assumes to work as Dp=DminWhen, U (Dp)=0；Work as Dp=DmaxWhen, U (Dp)=1.
U (D in formulap) it is less than D for particle diameterpParticle mass fraction；DmaxFor the particle diameter of the largest particles in system；DminFor
The particle diameter of smallest particles in system；N is modulus of distribution.Based on Dinger-Funk equations, according to Dinger-Funk equation meters
Calculation machine analog result, when modulus of distribution n is 0.37, system is piled up most tight.
According to the closely packed model of Dinger-Funk, when the particle packing of gelling system is closely knit, particle packing curve with
Most dense packing curve is close to.Therefore, to give full play to the high pozzolanic activity of the low-grade metakaolin of high-Fe-Ti and good
Filing effect, while reducing its harmful effect to fresh concrete service behaviour, the method that the present invention adopts Material cladding will
High-Fe-Ti metakaolin is carried out being combined and prepares a kind of metakaolin base high-performance concrete with again with microballon, flyash, slag powders
Admixture is closed, the various advantages of the tightly packed and effective performance multi mineral admixture of particle can not only be preferably realized, is risen
To over-superimposed effect, effect can be improved with reduces cost, energy saving, environmental protection promotes the popularization of high performance concrete
Using.
The present invention outstanding advantages be from Dinger-Funk closely packed models, using Material cladding optimisation technique,
Comprehensive utilization high-Fe-Ti metakaolin, microballon, flyash, slag powders are carried out being combined and prepare a kind of metakaolin base high-performance coagulation
Soil composite blend, solves the frictional force between the water requiremen and Binder Materials that metakaolin brought as one-component
A big difficult problem, significantly improves mix physical performance, mechanical property and the endurance quality of concrete, realizes the high performance of concrete.
Therefore, instant invention overcomes the deficiency of prior art presence, preferably realizes the tightly packed of particle and effectively play various
The various advantages of mineral admixture, play over-superimposed effect.
Description of the drawings
Fig. 1 is that the gelling material particles of embodiment 1 are actual piles up curve and Dinger-Funk closestpacking curves；
Fig. 2 is that the gelling material particles of embodiment 2 are actual piles up curve and Dinger-Funk closestpacking curves；
Fig. 3 is that the gelling material particles of embodiment 3 are actual piles up curve and Dinger-Funk closestpacking curves；
Fig. 4 is that the gelling material particles of embodiment 4 are actual piles up curve and Dinger-Funk closestpacking curves.
Specific embodiment
In order to be better understood from the present invention, with reference to embodiment present disclosure is further elucidated, but the present invention
Content is not limited solely to embodiment.
Embodiment 1
A kind of metakaolin base high-performance composite blending material for concrete, in mass ratio by 35% metakaolin, 18% micro-
Pearl, 27%II level flyash, 20%S75 slag powders are mixed.
In the present invention, the metakaolin is that in atmosphere prepared by natural cooling after calcining 2h at 850 DEG C by kaolin
Fe2O3And TiO2Gross mass content is 2%～4% low-quality metakaolin of high-Fe-Ti, its specific surface area 15000～
25000m2/ kg, grain diameter D50≤8 μm, 3d activity index >=90%, 7d activity index >=95%, 28d activity indexs >=
105%.
In the present invention, the microballon is closely knit glass spheres powder body material, grain diameter D50≤2.5 μm, water demand ratio
≤ 90%, 28d activity index >=100%；Grain diameter D50≤20 μm of the II levels flyash；The S75 slag powders
Grain particle diameter D50≤20 μm.
On the basis of C40 concrete, metakaolin base high-performance composite blending material for concrete equivalent replaces 20% cement
Prepare high performance concrete, the Stock allotment right of concrete is shown in Table 1, the mix physical performance of concrete, mechanical property and durability
2 can be shown in Table, the actual curve of piling up of the grain diameter of cementitious material system is shown in Fig. 1 with Dinger-Funk closestpacking curves.
Embodiment 2
A kind of metakaolin base high-performance composite blending material for concrete, in mass ratio by 40% metakaolin, 10% micro-
Pearl, 15%II level flyash, 35%S75 slag powders are mixed.
On the basis of C40 concrete, metakaolin base high-performance composite blending material for concrete equivalent replaces 30% cement
Prepare high performance concrete, the Stock allotment right of concrete is shown in Table 1, the mix physical performance of concrete, mechanical property and durability
2 can be shown in Table, the actual curve of piling up of the grain diameter of cementitious material system is shown in Fig. 2 with Dinger-Funk closestpacking curves.
Embodiment 3
A kind of metakaolin base high-performance composite blending material for concrete, in mass ratio by 30% metakaolin, 20% micro-
Pearl, 35%II level flyash, 15%S75 slag powders are mixed.
On the basis of C40 concrete, metakaolin base high-performance composite blending material for concrete equivalent replaces 20% cement
Prepare high performance concrete, the Stock allotment right of concrete is shown in Table 1, the mix physical performance of concrete, mechanical property and durability
2 can be shown in Table, the actual curve of piling up of the grain diameter of cementitious material system is shown in Fig. 3 with Dinger-Funk closestpacking curves.
Embodiment 4
A kind of metakaolin base high-performance composite blending material for concrete, in mass ratio by 35% metakaolin, 15% micro-
Pearl, 35%II level flyash, 15%S75 slag powders are mixed.
On the basis of C40 concrete, metakaolin base high-performance composite blending material for concrete equivalent replaces 30% cement
Prepare high performance concrete, the Stock allotment right of concrete is shown in Table 1, the mix physical performance of concrete, mechanical property and durability
2 can be shown in Table, the actual curve of piling up of the grain diameter of cementitious material system is shown in Fig. 4 with Dinger-Funk closestpacking curves.
Metakaolin described in embodiment 1,2,3,4 is naturally cold in atmosphere after calcining 2h at 850 DEG C by kaolin
But the Fe being prepared from2O3And TiO2Total content is the 3.34% low-quality metakaolin of high-Fe-Ti, specific surface area 22600m2/
Kg, grain diameter D50 are 4.6 μm, 3d activity indexs 94.2%, 7d activity indexs 104.6%, 28d activity indexs 114.9%.
The microballon is closely knit glass spheres powder body material, and grain diameter D50 is 1.466 μm, and water demand ratio 89%, 28d activity refers to
Number 105.7%.The grain diameter D50 of the II levels flyash is 18.5 μm.The grain diameter D50 of the S75 slag powders is
15.7μm.The cement of PO 42.5 that the cement of the C40 concrete is produced for Yunnan state-run assets cement Dong Jun Co., Ltds, particle
Particle diameter D50 is 22.4 μm, 3d compression strength 27.8MPa, 28d compression strength 51.2MPa；Sand is by Machine-made Sand and mountain sand according to its level
Sand in IIth area, modulus of fineness 2.8～3.0, content of stone powder 12.7%, crush index value are re-dubbed by a certain percentage with situation
16.5%, MB value 0.75；Stone is compared with situation according to its level by centimetre stone (5mm～25mm) and chicken girt (5～16mm) as certain
Example is re-dubbed the continuous grading rubble of 5mm～25mm particle diameters, crush values 6.1%, clay content 1.4%, clod content 0.25%, pin
Sheet-like particle content 1.4%；High performance water reducing agent of polyocarboxy acid solid content is 12%, and water-reducing rate is 28.3%.
The match ratio of the concrete of table 1
The mix physical performance of the concrete of table 2, mechanical property and endurance quality
From Tables 1 and 2 data, 1～example of embodiment 4 is mixed by metakaolin, microballon, II level flyash, S75 slag powders
The four kinds of composite blend equivalent closed replace after 20%～30% cement, and the slump and benchmark sample for controlling embodiment collapses
In the range of 200mm～220mm, the polycarboxylate water-reducer volume of embodiment reduces by 0.2%～0.3% to degree, and embodiment is mixed
The solidifying soil slump and divergence gradual loss are reduced.Compared with benchmark group, 7d, 28d and 60d compression strength of embodiment significantly increases
Plus, 7d, 28d and 60d intensity of wherein embodiment 4 respectively reaches 120%, 130%, the 119% of benchmark group；The anti-chlorine of embodiment
Ion permeability energy, early anti-cracking behavior energy and anti-freezing property are significantly improved, and the 56d electric fluxes of wherein 1～example of embodiment 4 drop respectively
It is low by 66.5%, 69.7%, 56.5% and 72.3%, total area of cracks reduces respectively 34.3%, 30.3%, 48.3% and
27.7%, freeze proof grade reaches F500～F550.
From Fig. 1～Fig. 4,1～example of embodiment 4 by metakaolin, microballon, II level flyash, the mixing of S75 slag powders and
Into four kinds of composite blend equivalent replace after 20%～30% cement, the particle of cementitious material system is actual pile up curve and
Dinger-Funk closestpackings curve is close to, and particularly coincide substantially in 1 μm～10 μm particle size ranges.
It can be seen that, metakaolin base high-performance composite blending material for concrete proposed by the present invention can realize Binder Materials
It is tightly packed, the various advantages of multi mineral admixture are played, over-superimposed effect is played, significantly improve the mix physical property of concrete
Energy, mechanical property and endurance quality, realize the high performance of concrete.
Claims (6)
1. a kind of metakaolin base high-performance composite blending material for concrete, it is characterised in that by metakaolin, microballon, II levels
Flyash, S75 slag powders are mixed, and the mass percent of each component is respectively：Metakaolin 30%～40%, microballon 10%
～20%, II levels flyash 15%～35%, S75 slag powders 15%～35%.
2. a kind of metakaolin base high-performance composite blending material for concrete according to claim 1, it is characterised in that institute
It is by the kaolin Fe that in atmosphere natural cooling is prepared from after calcining 2h at 850 DEG C to state metakaolin2O3And TiO2Total matter
Amount content is 2%～4% low-quality metakaolin of high-Fe-Ti.
3. a kind of metakaolin base high-performance composite blending material for concrete according to claim 1, it is characterised in that institute
It is closely knit glass spheres powder body material to state microballon, grain diameter D50≤2.5 μm.
4. a kind of metakaolin base high-performance composite blending material for concrete according to claim 1, it is characterised in that：Institute
State grain diameter D50≤20 μm of II level flyash.
5. a kind of metakaolin base high-performance composite blending material for concrete according to claim 1, it is characterised in that institute
State grain diameter D50≤20 μm of S75 slag powders.
6. a kind of application of metakaolin base high-performance composite blending material for concrete as claimed in claim 1, its feature exists
In the metakaolin base high-performance composite blending material for concrete of the quality such as use replaces cement to be incorporated into concrete gel material
In, incorporation accounts for the 20%～30% of total Binder Materials quality.
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| CN201611163711.6A CN106587686A (en) | 2016-12-15 | 2016-12-15 | Metakaolin-based high-performance concrete composite admixture and application thereof |
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| CN113185217A (en) * | 2021-04-22 | 2021-07-30 | 同济大学 | Ultra-high performance concrete containing metakaolin and preparation method thereof |
| CN113185242A (en) * | 2021-04-13 | 2021-07-30 | 武汉源锦建材科技有限公司 | Ultrahigh-strength grouting material for connecting assembled bridge reinforcing steel bar sleeve and preparation method thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113185242A (en) * | 2021-04-13 | 2021-07-30 | 武汉源锦建材科技有限公司 | Ultrahigh-strength grouting material for connecting assembled bridge reinforcing steel bar sleeve and preparation method thereof |
| CN113185242B (en) * | 2021-04-13 | 2023-03-10 | 武汉源锦建材科技有限公司 | Ultrahigh-strength grouting material for connecting assembled bridge reinforcement sleeve and preparation method thereof |
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| CN113185217B (en) * | 2021-04-22 | 2022-09-06 | 同济大学 | Ultra-high performance concrete containing metakaolin and preparation method thereof |
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