CN106747112B - A kind of ultra-high performance concrete and its dry blend - Google Patents
A kind of ultra-high performance concrete and its dry blend Download PDFInfo
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- CN106747112B CN106747112B CN201710007782.5A CN201710007782A CN106747112B CN 106747112 B CN106747112 B CN 106747112B CN 201710007782 A CN201710007782 A CN 201710007782A CN 106747112 B CN106747112 B CN 106747112B
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/34—Non-shrinking or non-cracking materials
- C04B2111/346—Materials exhibiting reduced plastic shrinkage cracking
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/40—Porous or lightweight materials
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- Chemical Kinetics & Catalysis (AREA)
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Abstract
The present invention relates to a kind of ultra-high performance concrete and its dry blends, dry blend includes cementitious material, mountain flour, sand and water-reducing agent, and one of porous aggregate, super water absorbent resin and the petition of surrender agent or more than one, every cubic metre of ultra-high performance concrete includes cementitious material 500-1600kg/m3, mountain flour 0-500kg/m3, sand 0-1500kg/m3, water-reducing agent 5-30kg/m3, porous aggregate 35-250kg/m3, super water absorbent resin volume is the 0.1%-1.2% of cementitious material quality, and the petition of surrender agent volume is the 1-5% of cementitious material quality.By dry blend of the invention water mix, 28d intensity can reach 100Mpa or more under standard curing；Commonly used ultra-high performance concrete, self-constriction can reduce by 40% or more, and dry shrink can reduce by 30% or more.
Description
Technical field
The present invention relates to the field of building materials, and in particular to a kind of ultra-high performance concrete and its dry blend.
Background technique
Different from normal concrete, ultra-high performance concrete (abbreviation UHPC, Ultra-High Performance
Concrete coarse aggregate) is eliminated, selects fine sand as aggregate, is added to silicon ash, ground granulated blast furnace slag, flyash and rice hull ash etc.
High efficiency water reducing agent and steel fibre, and strict control water-cement ratio is added in mineral admixture.Since micro- filling of mineral admixture is imitated
Should and volcano ash effect so that ultra-high performance concrete is more closely knit than normal concrete, intensity is largely increased.And steel fibre
Incorporation be even more to improve the tensile strength and toughness of ultra-high performance concrete so that ultra-high performance concrete absorbs impact load
Ability be improved.
Although ultra-high performance concrete has many advantages, such as that excellent working performance, mechanical property are higher, durability is good, due to
The features such as its gel material content height and low water-cement ratio, and ultra-high performance concrete uses a large amount of mineral admixture (silicon ash
With miberal powder etc.), this also causes its self-constriction phenomenon very significant.Ultra-high performance concrete internal microstructure is fine and close, common
External maintenance method the methods of (covering and spraying) can only play a role in the extexine of ultra-high performance concrete, it is difficult to right
Maintenance is played the role of in the inside of ultra-high performance concrete, thus the shrinkage cracking inside ultra-high performance concrete be one urgently
It solves the problems, such as.If ultra-high performance concrete self-constriction early-stage development is very fast, it is easy to produce crack under Prescribed Properties, thus
Ultra-high performance concrete mechanical property and durability are influenced, this also constrains the fortune of ultra-high performance concrete in engineering practice
With.
The features such as ultra-high performance concrete has compared with low water-cement ratio, and cementitious material content is high and the pozzolanic reaction in later period,
This is but also the contraction of ultra-high performance concrete and the difference in shrinkage of normal concrete are larger.In ultra-high performance concrete, from
Contraction occupies its 70-80% or more always shunk, therefore generally takes based on self-constriction, and is aided with the method for dry contraction to comment
Its shrinkage of valence.
Summary of the invention
The technical problem to be solved by the present invention is to overcome common maintenance to be difficult to carry out effectively ultra-high performance concrete inside
The drawbacks of maintenance, provides the ultra-high performance concrete and its dry blend of a kind of lower shrinkage.
The present invention analyzes the contraction feasibility for reducing ultra-high performance concrete from internal mechanism, reduces very-high performance coagulation
The risk of native shrinkage cracking.
The technical solution used to solve the technical problems of the present invention is that: be added super water absorbent resin (SAP), porous aggregate and
The petition of surrender agent, by ratio optimization, makes a kind of lower shrinkage very-high performance coagulation into the raw material of ultra-high performance concrete
The dry blend of soil.
Specifically, the technical solution of the present invention is as follows: a kind of dry blend of ultra-high performance concrete, including cementitious material,
One of mountain flour, sand and water-reducing agent and porous aggregate, super water absorbent resin and the petition of surrender agent or more than one, every cube
Rice ultra-high performance concrete includes cementitious material 500-1600kg/m3, mountain flour 0-500kg/m3, sand 0-1500kg/m3, water-reducing agent
5-30kg/m3, porous aggregate 35-250kg/m3, super water absorbent resin volume is the 0.1%-1.2% of cementitious material quality, the petition of surrender
Open the 1-5% that agent volume is cementitious material quality.
In a specific embodiment, cementitious material includes: cement 400-800kg/m3, silicon ash 100-500kg/m3, fine coal
Grey 0-400kg/m3, miberal powder 0-400kg/m3, rice hull ash 0-200kg/m3With agstone 0-200kg/m3。
In a specific embodiment, mountain flour Particle size requirements are less than 200 μm.
In a specific embodiment, the Particle size requirements of sand are less than 5mm, sand-binder ratio 0.5-3.0.
In a specific embodiment, water-reducing agent use high-performance polycarboxylic acids water reducing agent dry powder, water-reducing rate require 20% with
On.
In a specific embodiment, porous aggregate partial size is less than 5mm, and volume is the 5%-30% of sand body used product.
In a specific embodiment, super water absorbent resin is that polyacrylic resin and/or acrylamide and acrylic acid are copolymerized
Object, partial size are 10-800 μm.
In a specific embodiment, the petition of surrender agent is polyacrylate, polyethers or polyethers analog derivative, unitary or two
First alcohols, alkamine, polyoxyethylene, alkylamino class or oxyalkylene alcohols.
Ultra-high performance concrete provided by the invention is added water using dry blend described in right and stirs.Water-cement ratio one
As be 0.14-0.25.
The present invention uses super water absorbent resin, and super water absorbent resin is a kind of industrial product, is mainly used in health and agriculture
Industry field, as moisturizing (water) agent, product category is based on polyacrylic resin.Chemically essentially, super water absorbent resin
It (SAP) is a kind of polyelectrolyte containing strong hydrophilicity group (such as-COOH ,-OH).Before water suction, macromolecular chain is mutually being twined
Around together, tridimensional network is formed；After hydrone enters, causes hydrophilic radical to ionize, make to generate between the solution of inside and outside
Ion concentration is poor, promotes outside moisture to go successively to reduce concentration difference, finally exists in the form of hydrogel.Super water-absorbent
Resin, which is added in ultra-high performance concrete, can also play moisture-keeping function, delay the reduction of interior humidity, to reach inhibition from receipts
The purpose of contracting.
Porous aggregate is generally used in lightweight aggregate concrete, plays the role of reducing self weight.The porous bone that the present invention uses
Material is to delay the internal relative humidity due to caused by self-desiccation inside ultra-high performance concrete by the introducing of interior curing water
It reduces, to achieve the purpose that inhibit self-constriction.
The petition of surrender agent (surface tension reducer) refers to a kind of substance for reducing concrete pore solution surface tension,
It is divided into polyacrylate, polyethers or polyethers analog derivative, unitary or di-alcohols, alkamine, polyoxyethylene, alkylamino
Class, oxyalkylene alcohols.The petition of surrender agent is reduced by reducing the surface tension of ultra-high performance concrete internal void solution from receipts
Contracting and dry contraction.
Dry blend of the invention contains a large amount of mineral admixture, mainly includes silicon ash, flyash, miberal powder, rice hull ash
With agstone etc..Mineral admixture is added in ultra-high performance concrete and primarily serves filing effect and volcano ash effect.No
Mineral grain with particle size is closely accumulated, micro-packing effect make mineral admixture be filled in cement granules between sky
Gap improves the compactness of ultra-high performance concrete, while also optimizing the gradation of cementitious material, so that ultra-high performance concrete
Water consumption is reduced under the premise of keeping normal consistency.And volcano ash effect makes CaO/ in ultra-high performance concrete hydrated product
SiO2The ratio between reduce, increase the degree of polymerization of silicate, organize more closely knit, intensity is greatly improved.In addition, fine coal
Ash is the waste that must be discharged using coal as the power plant of substantially fuel, using flyash as ultra-high performance concrete in mine
Polymer blends material can both turn waste into wealth, and also protect environment.A certain amount of flyash is added in ultra-high performance concrete both may be used
To save a large amount of cement, the heat of hydration is reduced, improves the workability of ultra-high performance concrete, and can be improved very-high performance
The impermeability of concrete and the shrinkage and creep for reducing ultra-high performance concrete.
The present invention uses high efficiency water reducing agent.In general, the effect that water-reducing agent plays in concrete mix mainly has
On the one hand two aspects are to improve the mobile performance of concrete keeping water consumption under the same conditions；It on the other hand is to keep
Under the premise of concrete flowability is constant, water consumption can be reduced, to improve the intensity of concrete material.High efficiency water reducing agent
Feature is: water-reducing rate is high (being greater than 15%), small on setting time influence, opposite with cement adaptability preferable.So super preparing
When high performance concrete, high efficiency water reducing agent need to be added, ultra-high performance concrete is made to be able to maintain high intensity, while there is high flowing
Property, enables ultra-high performance concrete self-flowing dense, in engineering reinforcement field, it is often necessary in former concrete outsourcing superelevation
Energy concrete membrane, this just proposes quite high requirement to the mobility of ultra-high performance concrete.
The beneficial effects of the present invention are: dry blend of the invention to be used to the water-cement ratio mix of 0.15-0.25, supported in standard
100Mpa or more can be reached by protecting lower 28d intensity；Commonly used ultra-high performance concrete, self-constriction can reduce by 40% or more
(highest can reduce by 60% or more), dry shrink can reduce by 30% or more.Ultra-high performance concrete is promoted in engineering
Utilization in practice.
Detailed description of the invention
Fig. 1 is the compression strength comparison diagram of the ultra-high performance concrete of embodiment 1-4；
Fig. 2 is the self-constriction comparison diagram of the ultra-high performance concrete of embodiment 1-4；
Fig. 3 is that the dry of the ultra-high performance concrete of embodiment 1-4 shrinks comparison diagram.
Specific embodiment
Below by specific embodiment, the present invention is further elaborated.Must not should be noted that following embodiments
It is construed to the limitation to the content of present invention.
The dry blend of ultra-high performance concrete of the present invention includes cementitious material, mountain flour, sand, porous aggregate, super water-absorbent tree
Rouge, the petition of surrender agent and water-reducing agent.
Cementitious material includes cement and complementary cementitious material, and complementary cementitious material includes silicon ash, flyash, miberal powder,
Rice hull ash and agstone etc..
In a specific embodiment, binder total amount 500-1600kg/m3(every cubic metre of ultra-high performance concrete
Including cementitious material), comprising: cement 400-800kg/m3, silicon ash 100-500kg/m3, flyash 0-400kg/m3, miberal powder 0-
400kg/m3, rice hull ash 0-200kg/m3With agstone 0-200kg/m3。
In a specific embodiment, 0-500kg/m is added in every cubic metre of ultra-high performance concrete of mountain flour3, mainly at
Dividing is inertia SiO2, partial size generally requires less than 200 μm.
Fine aggregate generally uses quartz sand, and 0-1500kg/m is added in every cubic metre of ultra-high performance concrete3, partial size generally wants
It asks and is less than 5mm, preferably sand-binder ratio is 0.5-3.0.
In a specific embodiment, 35-250kg/m is added in every cubic metre of ultra-high performance concrete of porous aggregate3, grain
Diameter generally requires to be less than 5mm, takes isometric substitution method, and volume is the 5%-30% of sand body used product.
In a specific embodiment, super water absorbent resin partial size is 10-800 μm, and volume is cementitious material quality
0.1%-1.2%.Super water absorbent resin main component is polyacrylic resin, acrylamide and acrylic acid copolymer.
In a specific embodiment, the petition of surrender agent volume is the 1-5% of cementitious material quality.The petition of surrender agent mainly divides
For polyacrylate, polyethers or polyethers analog derivative, unitary or di-alcohols, alkamine, polyoxyethylene, alkylamino class
With oxyalkylene alcohols.
In a specific embodiment, 5-30kg/m is added in every cubic metre of ultra-high performance concrete of water-reducing agent3, using height
Performance polycarboxylate water-reducer dry powder, water-reducing rate require 20% or more, and the volume of water-reducing agent guarantees the fluidity of concrete in 200mm
Left and right.
The application method of dry blend of the present invention: dry blend is stirred evenly, and a certain amount of water stirring is added, use
Water-cement ratio is generally 0.14-0.25, is prepared into ultra-high performance concrete.Dry blend of the invention can be prepared low by this method
Shrink ultra-high performance concrete, convenient and efficient, the utilization suitable for engineering.
Ultra-high performance concrete is configured using dry blend of the invention, then tests its intensity, self-constriction, dry receipts
Contracting, determine the agent of super water absorbent resin, porous aggregate and the petition of surrender to the affecting laws of ultra-high performance concrete shrinkage,
To prepare with the ultra-high performance concrete dry blend compared with lower shrinkage.
Embodiment 1
(1) in this example, cementitious material uses P.I.42.5 portland cement, flyash and silicon ash.Fine aggregate is natural
Sand, partial size 0-2.36mm continuous grading, fineness modulus 2.7, apparent density 2610kg/m3.High hydroscopic resin (SAP) is acryloyl
Amine-acrylic copolymer.The polycarboxylic acid series high efficiency water reducing agent dry powder that water-reducing agent uses, water-reducing rate is 30% or more.Match ratio is shown in
Table 1.
1 ultra-high performance concrete match ratio of table
(2) its intensity, self-constriction and dry contraction are detected after adding water to mix and stir above-mentioned ultra-high performance concrete dry blend,
Experimental result is shown in Fig. 1-3.
Embodiment 2
(1) in this example, cementitious material uses P.I.42.5 portland cement, flyash and silicon ash.Fine aggregate is natural
Sand, partial size 0-2.36mm continuous grading, fineness modulus 2.7, apparent density 2610kg/m3.The petition of surrender agent volume is 2%, master
Wanting ingredient is oxyalkylene alcohols material；The polycarboxylic acid series high efficiency water reducing agent dry powder that water-reducing agent uses, water-reducing rate is 30% or more.Match
Composition and division in a proportion is shown in Table 2.
2 ultra-high performance concrete match ratio of table
(2) experimental result is shown in Fig. 1-3 for the intensity of ultra-high performance concrete, self-constriction and dry contraction.
Embodiment 3
(1) in this example, cementitious material uses P.I.42.5 portland cement, flyash and silicon ash.Aggregate is natural sand,
Partial size 0-2.36mm continuous grading, fineness modulus 2.7, apparent density 2610kg/m3.High hydroscopic resin (SAP) is acrylamide-
Acrylic copolymer；The petition of surrender agent volume is 2%, and main component is oxyalkylene alcohols material.Water-reducing agent uses polycarboxylic-acid
High efficiency water reducing agent dry powder, water-reducing rate is 30% or more.Match ratio is shown in Table 3.
3 ultra-high performance concrete match ratio of table
(2) experimental result is shown in Fig. 1-3 for the intensity of ultra-high performance concrete, self-constriction and dry contraction.
Embodiment 4
(1) in this example, cementitious material uses P.I.42.5 portland cement, flyash and silicon ash.Aggregate is natural sand,
Partial size 0-2.36mm continuous grading, fineness modulus 2.7, apparent density 2610kg/m3.Lightweight sand grains diameter is the continuous grade of 0-2.36mm
Match, apparent density 1700Kg/m3, volume 20%.Water-reducing agent uses polycarboxylic acid series high efficiency water reducing agent dry powder, and water-reducing rate exists
30% or more.Match ratio is shown in Table 4.
4 ultra-high performance concrete match ratio of table
(2) experimental result is shown in Fig. 1-3 for the intensity of ultra-high performance concrete, self-constriction and dry contraction.
Ultra-high performance concrete performance detection in above-described embodiment is as follows:
Fig. 1 is compression strength figure of the ultra-high performance concrete in 3d, 28d and 90d of embodiment 1-4.It is single compared to reference group
Mixing SAP and mixing SAP and the 3d compression strength of oxyalkylene alcohols material again reduces 5.4% and 1.1% respectively, and singly mixes oxyalkylene
Alcohols material and the 3d compression strength for singly mixing porous aggregate increase 11.0% and 0.4% respectively；Singly mix SAP, oxyalkylene alcohols
Substance, porous aggregate and mix again SAP and oxyalkylene alcohols material 28d compression strength increase 1.5% respectively, 21.3%,
16.5% and 6.0%；Singly mix SAP, oxyalkylene alcohols material, porous aggregate and mix again SAP and oxyalkylene alcohols material 28d it is anti-
Compressive Strength increases 4.1%, 13.1%, 11.0% and 1.8% respectively.Ultra-high performance concrete 90d resistance to compression in each embodiment
Intensity is both greater than 100Mpa.
Fig. 2 be embodiment 1-4 ultra-high performance concrete in 72h self-constriction variation diagram.Compared to reference group, each example
Self-constriction is all substantially reduced.Singly mix SAP, oxyalkylene alcohols material, porous aggregate and mix again SAP and oxyalkylene alcohols material from
Contraction reduces 48.6%, 60%, 64.3% and 44.7% respectively.
Fig. 3 is drying contractible graph of the ultra-high performance concrete in 0-90d of embodiment 1-4.Compared to reference group, each example
Dry shrink have certain reduction.It singly mixes SAP, oxyalkylene alcohols material, porous aggregate and mixes SAP and oxyalkylene alcohols again
Dry shrink of substance reduces 4.7%, 38.8%, 11.5% and 24.7% respectively.
Embodiment 5
(1) in this example, cementitious material uses P.I.42.5 portland cement, flyash and silicon ash.Aggregate is natural sand,
Partial size 0-2.36mm continuous grading, fineness modulus 2.7, apparent density 2610kg/m3.High hydroscopic resin (SAP) is acrylamide-
Acrylic copolymer；The petition of surrender agent volume is 1%, and main component is polyoxyethylene substance.Lightweight as porous aggregate
Sand grains diameter is 0-2.36mm continuous grading, apparent density 1700Kg/m3, volume 5%.
Water-reducing agent uses polycarboxylic acid series high efficiency water reducing agent dry powder, and water-reducing rate is 30% or more.Match ratio is shown in Table 5.
5 ultra-high performance concrete match ratio of table
(2) intensity of ultra-high performance concrete, self-constriction and dry contraction experimental result: compared to reference group, 3d, 28d
12.1%, 26.7% and 25.1% is increased with 90d compression strength；Self-constriction reduces 59.9%；Dry shrink reduces
10.4%.
Embodiment 6
In this example, cementitious material uses P.I.42.5 portland cement, flyash and silicon ash.Aggregate is natural sand, grain
Diameter 0-2.36mm continuous grading, fineness modulus 2.7, apparent density 2610kg/m3.High hydroscopic resin (SAP) is polyacrylic acid tree
Rouge；The petition of surrender agent volume is 5%, and main component is oxyalkylene alcohols material.Lightweight sand grains diameter as porous aggregate is 0-
2.36mm continuous grading, apparent density 1700Kg/m3, volume 30%.
Water-reducing agent uses polycarboxylic acid series high efficiency water reducing agent dry powder, and water-reducing rate is 30% or more.Match ratio is shown in Table 5.
5 ultra-high performance concrete match ratio of table
Claims (9)
1. a kind of dry blend of ultra-high performance concrete, it is characterised in that including cementitious material, mountain flour, sand and water-reducing agent, and
The agent of porous aggregate, super water absorbent resin and the petition of surrender, every cubic metre of ultra-high performance concrete includes cementitious material 500-1600
kg/m3, mountain flour 0-500 kg/m3, sand 0-1500 kg/m3, water-reducing agent 5-30 kg/m3, porous aggregate 35-250 kg/m3, superabsorbent
Water-base resin volume is the 0.1%-1.2% of cementitious material quality, and the petition of surrender agent volume is the 1-5% of cementitious material quality；
The cementitious material includes: cement 400-800kg/m3, silicon ash 100-500 kg/m3, flyash 0-400 kg/m3, miberal powder
0-400 kg/m3, rice hull ash 0-200 kg/m3With agstone 0-200 kg/m3。
2. the dry blend of ultra-high performance concrete according to claim 1, it is characterised in that mountain flour Particle size requirements are less than 200
μm。
3. the dry blend of ultra-high performance concrete according to claim 1, it is characterised in that the Particle size requirements of sand are less than
5mm, sand-binder ratio 0.5-3.0.
4. the dry blend of ultra-high performance concrete according to claim 1, it is characterised in that water-reducing agent is poly- using high-performance
Carboxylic acid water reducer dry powder, water-reducing rate require 20% or more.
5. the dry blend of ultra-high performance concrete described according to claim 1 ~ one of 4, it is characterised in that porous aggregate partial size
Less than 5mm, volume is the 5%-30% of sand body used product.
6. the dry blend of ultra-high performance concrete described according to claim 1 ~ one of 4, it is characterised in that super water absorbent resin
For polyacrylic resin and/or acrylamide and acrylic acid copolymer, partial size is 10-800 μm.
7. the dry blend of ultra-high performance concrete described according to claim 1 ~ one of 4, it is characterised in that the petition of surrender agent is poly-
Acrylates, polyethers or polyethers analog derivative, unitary or di-alcohols, alkamine, polyoxyethylene.
8. a kind of ultra-high performance concrete, it is characterised in that using the addition water stirring of dry blend described in one of claim 1 ~ 7
At.
9. ultra-high performance concrete according to claim 8, it is characterised in that water-cement ratio 0.14-0.25.
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| CN109678413A (en) * | 2019-01-25 | 2019-04-26 | 中山市灵湾新材料科技有限公司 | A kind of high performance concrete dry blend and its application method |
| CN110627429B (en) * | 2019-07-09 | 2022-05-06 | 武汉理工大学 | Pumice-based light self-compacting ultrahigh-performance concrete and preparation method thereof |
| CN111410479A (en) * | 2020-03-30 | 2020-07-14 | 沈阳理工大学 | Ultrahigh-performance concrete and preparation method thereof |
| CN111470823A (en) * | 2020-04-29 | 2020-07-31 | 上海城建市政工程（集团）有限公司 | Composite cementing material system of ultra-high performance concrete and application method thereof |
| CN111484298B (en) * | 2020-05-22 | 2022-06-28 | 河南金诺混凝土有限公司 | Dry-mixed concrete and preparation method thereof |
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