CN108358562A - Microdilatancy high-performance low gas content amount self-compacting concrete and its preparation method - Google Patents
Microdilatancy high-performance low gas content amount self-compacting concrete and its preparation method Download PDFInfo
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- CN108358562A CN108358562A CN201810386694.5A CN201810386694A CN108358562A CN 108358562 A CN108358562 A CN 108358562A CN 201810386694 A CN201810386694 A CN 201810386694A CN 108358562 A CN108358562 A CN 108358562A
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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
- C04B2111/60—Flooring materials
- C04B2111/62—Self-levelling compositions
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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
Abstract
The invention discloses microdilatancy high-performance low gas content amount self-compacting concrete and its preparation method, concrete includes the following component counted in parts by weight：300~450 parts of portland cement, 50~100 parts of flyash, 20~80 parts of miberal powder, 700~900 parts of coarse aggregate, 700~900 parts of fine aggregate, 20~60 parts of swelling agent, 6~8 parts of special additive, 170~200 parts of mixing water.The self-compacting concrete of the present invention has many advantages, such as that microdilatancy, low gas content amount, controllability, application prospect are good.
Description
Technical field
The present invention relates to building material technical fields.It is more particularly related to microdilatancy high-performance low gas content amount
Self-compacting concrete and its preparation method.
Background technology
China has built a large amount of bridges since the fifties, and by runing for a long time, most of bridge faces maintenance and reinforcement
The problem of, for concrete structure bridge, increasing section method for strengthening is one of most common maintenance reinforcement method.Increase to reduce
The size of the weight added, increasing section is often limited, this causes concrete to be not easy to pour and vibrate, therefore increasing section reinforcing is mixed
Solidifying soil material largely uses self-compacting concrete.
Traditional self-compacting concrete generally pays close attention to the working performance of concrete, has ignored contraction, the appearance of concrete
The performances such as quality and durability there are air content height, shrink the problems such as big, it is difficult to the narrow sky of closing suitable for exhaust problem
Between, Surface Quality of Concrete require bridge increasing section engineering high, that new-old concrete age difference is big, especially double curvature arched bridge
Main arch rib increasing section.Patent《A kind of early strong strength self-compaction concrete and its mixing proportion design method》It is configured using traditional material
Go out early strong strength self-compaction concrete, but the proportioning only studies divergence and early strength.Patent《Self-compaction slightly expanded concrete and its
Preparation method》Microdilatancy self-compacting concrete is made, which only studies self-compacting concrete expansion character, and former
Material category is various, construction is complicated, is unfavorable for the mixing of construction site self-compacting concrete.Patent《A kind of enclosure space perfusion
Use special additive》Special additive emphasis adjustment working performance of self-compacting concrete is configured, under the premise of ensureing stability
Viscosity is reduced, increases flow velocity, but do not consider self-compacting concrete shrinkage and air content performance.
With the development of modern material science and technology, self-compacting concrete use scope is more and more wider, but the boundary used
Condition is higher and higher, and the requirement to self-compacting concrete is also just more and more.It is small for casting space, appearance requirement is high,
The long and narrow arcual component that New-old concrete age difference is big, the cast in situs duration is long, concrete entirety side amount is little increases
Strengthened section engineering is as follows to self-compacting concrete specific requirement：
1) height is required to working performance of self-compacting concrete, since the size of arch rib increasing section is smaller, in section
Toward the densely covered multi-story steel mesh of contact, therefore require self-compacting concrete that there is preferable working performance；
2) strengthening of arch rib of arch bridge mostly uses mud-jacking technology or instillation process from top to bottom, but no matter which kind of technique its
Speed of perfusion is all relatively slow, generally requires the construction time of 2~3h, this just proposes the function of slump protection of self-compacting concrete higher
Requirement；
3) the arch rib increasing section longitudinal size of one side arch bridge is longer, and sectional dimension is smaller, controls self-compacting concrete
It shrinks, it can be to avoid the generation of micro-crack；On the other hand old arch rib concrete contraction has terminated, and controls the new self-compaction of increasing section
Concrete shrinkage, being conducive to new-old concrete has a good interface；
4) traditional self-compacting concrete requires sand material preferable, and clay content, elongated particles all propose high requirement, and
At present in face of sand material environmental background increasingly in short supply, the easy quality fluctuation of sand material or it is unsatisfactory for standard requirement, may all led
It causes self-compacting concrete isolation coarse aggregate occur to be brought together simultaneously, concrete flowability loss is big or concrete is too viscous, makes
It is unsmooth at concreting.
In this context, we are there is an urgent need to develop a kind of self-compacting concrete of microdilatancy high-performance low gas content amount,
The problems such as traditional self-compacting concrete air content is high, contraction is big, concrete stability is poor is solved to a certain extent.
Invention content
It is an object of the present invention to provide microdilatancy high-performance low gas content amount self-compacting concrete and its preparation method, tools
Have the advantages that microdilatancy, low gas content amount, controllability, application prospect are good.
In order to realize these purposes and other advantages according to the present invention, microdilatancy high-performance low gas content amount is provided from close
Real concrete, which is characterized in that including the following component counted in parts by weight：300~450 parts of portland cement, flyash 50
~100 parts, it is 20~80 parts of miberal powder, 700~900 parts of coarse aggregate, 700~900 parts of fine aggregate, 20~60 parts of swelling agent, special outer
Add 6~8 parts of agent, 170~200 parts of mixing water.
Special additive is the critical material for configuring self-compacting concrete, and the present invention is for practice of construction concrete and easy
Property it is insufficient, the chemical assistant using certain specific function effectiveness is improved, and keeps concrete mix certain in raw material quality
Degree fluctuation in the case of, can reach without vibrate can Self-leveling, self-compaction state, to avoid rear concrete structure is poured
The defect of component.
Preferably, further include：2~4 parts of interior curing agent, is spheric granules SAP high hydroscopic resins, and fineness is 120 mesh.
Interior curing agent and the comprehensive of swelling agent use, and can be very good to solve high performance flowing concrete due to being gelled greatly
Caused by dry contraction problem.The interior maintenance of a small amount of spheric granules, a side are added in microdilatancy high performance flowing concrete
Face effectively can provide moisture for later concrete hydrated cementitious, reduce the self-desiccation shrinkage of concrete；On the other hand also may be used
Process to generate entringite for swelling agent provides partially crystallizable water, the effective effect for improving swelling agent, micro- swollen to reach
Swollen purpose.The incorporation of interior maintenance can also improve the freeze proof anti-permeability performance of high performance flowing concrete.
Preferably, the portland cement is 42.5 Portland cements of PO.
Preferably, the fine aggregate includes that 80% fineness modulus is less than in 2.5~2.7 middle sand and 20% grain size
The fine sand of 0.1mm.The fine aggregate is middle sand of the fineness modulus 2.5~2.7, and is less than containing 20% grain size in sand
The fine sand of 0.1mm can optimize the control of fine sand the grading grain size of self-compacting concrete aggregate, improve self-compacting concrete
Working performance and the susceptibility for reducing water.
Preferably, the coarse aggregate is the limestone gravel of grain size 5mm~16mm continuous gradings, and flat-elongated particles contain
Amount≤8%.
Preferably, the flyash is I grade of ash, and miberal powder is S95 types, and the swelling agent is compound swelling agent.
Preferably, the special additive includes that water-reducing agent, slump retaining agent, workability conditioning agent, economization agent, high-performance are steady
Infusion, high performance air-entraining agent, viscosity modifier, retarder.
Preferably, water-reducing agent is polycarboxylate water-reducer in the special additive and mass fraction is 30%~40%,
Slump retaining agent mass fraction is 20%~30%, and workability conditioning agent mass fraction is 15%~20%, and economization agent mass fraction is
11%~14%, high-performance foam stabilizer mass fraction be 0.1%~0.5%, high performance air-entraining agent mass fraction be 0.5%~
1.0%, viscosity modifier mass fraction is 0.1%~0.5%, and retarder mass fraction is 1%~1.5%.
Make self-compacting concrete slump 3h~4h frees of losses by adding slump retaining agent, improves self-compacting concrete slump retaining
Energy.Self-compacting concrete viscosity is adjusted by adding workability conditioning agent, slurry homogeneity is improved, reduces water consumption susceptibility.
Self-compacting concrete contraction can be reduced by adding economization agent, improves new-old concrete interfacial bond property.It is high by adding
Performance foam stabilizer can adjust bubble structure in self-compacting concrete so that and bubble is stablized, and self-compacting concrete structure is more closely knit,
Appearance reaches the state of low gas content amount concrete without air pocket.Viscosity can be adjusted by adding viscosity modifier, improves coagulation
The wrapping property of soil improves education resistance energy.Concrete coagulating time can be adjusted by adding retarder, improves self-compaction coagulation
Native function of slump protection.
The present invention also provides a kind of preparation methods of microdilatancy high-performance low gas content amount self-compacting concrete, including walk as follows
Suddenly：
Step 1：Interior curing agent is impregnated 5h in advance makes its water suction saturation, is prepared into Concrete；
Step 2：According to each component quality proportioning of special additive, container is poured into after each component is weighed well according to the ratio
In, then adding mixing water so that the solid content of special additive is 25%, is stirred for mixture B；
Step 3：According to the requirement of self-compacting concrete each component match ratio, weigh respectively portland cement, flyash,
Miberal powder, coarse aggregate, fine aggregate, swelling agent, and 1min is stirred in blender, allow each component to be stirred for mixture C；
Step 4：After mixing by the mixing water of the mixture B and surplus that are stirred evenly in step 2, it is slow added into
Mixture A, and continue to stir 2min, it is then slow added into mixture C, self-compaction of the invention can be obtained by persistently stirring 2min
Concrete.
The present invention includes at least following advantageous effect：
1, microdilatancy high-performance low gas content amount self-compacting concrete of the present invention goes out machine divergence >=700mm, expansion time
T500≤5s, 0≤PA2≤25mm, SR≤15%, 28d drying shrinkages≤0.2 ‰.
2, microdilatancy high-performance low gas content amount self-compacting concrete provided by the invention have microdilatancy, low gas content amount, can
The advantages that modulability, and concrete stability preferably, without bleeding and discrete phenomena, concrete appearance bubble-free.It can be used for tying
The concrete increasing section engineerings such as structure complexity, narrow space, appearance requirement are high, new-old concrete age difference is big, especially
It is the arch rib increasing section engineering of double curvature arched bridge.
3, the micro-expansibility energy of concrete of the present invention：By adding complex class swelling agent and economization agent, concrete is made to generate
Microdilatancy, 28d drying shrinkages are less than 0.2 ‰, reduce microcrack caused by self-compacting concrete is shunk, improve new-old concrete
Interfacial adhesion.
4, the low gas content amount of concrete of the present invention：Self-compacting concrete is controlled by adding high-performance foam stabilizer and air entraining agent
Air content adjusts self-compacting concrete air entrapment structure and concrete viscosity itself, allows micro-bubble to be stabilized, to allow
Self-compacting concrete is more closely knit, and surface is more smooth, reaches the appearance requirement of clear-water concrete.
5, the controllability of concrete of the present invention：The present invention uses special additional made of a variety of composition of concrete admixture
Agent, can effectively improve the working performance of self-compacting concrete, ensure self-compacting concrete have better cohesiveness, resist from
The problems such as analysis property, concrete outer surface is more closely knit, no hole, bubble.The special water-reducing agent of self-compacting concrete can also basis
The characteristics of local raw material and type, the chemical assistant using certain specific function effectiveness are improved, and concrete mix is made
Fluctuated to a certain degree in raw material quality, can reach without vibrate can Self-leveling, self-compaction state, to avoid
Pour the defect of rear concrete structure member.
6, the application prospect of concrete of the present invention is good：The microdilatancy high-performance low gas content amount self-compacting concrete tool of the present invention
There are microdilatancy, low gas content amount, controllability, it is high, new to can be used for complicated, narrow space, appearance requirement
The big equal concrete increasing section engineering of old concrete age difference, especially the arch rib increasing section engineering of double curvature arched bridge.
7, old concrete is also added in concrete of the present invention, derived from a wealth of sources, intensity is high, wearability is good, interface cohesion
Power is strong, and durability is good, is greatly improved the various aspects of performance of self-compacting concrete of the present invention.
Part is illustrated to embody by further advantage, target and the feature of the present invention by following, and part will also be by this
The research and practice of invention and be understood by the person skilled in the art.
Description of the drawings
Fig. 1 is the Performance of Self-compacting Concrete state diagram one of the embodiment of the present invention 2；
Fig. 2 is the Performance of Self-compacting Concrete state diagram two of the embodiment of the present invention 2；
Fig. 3 is the Performance of Self-compacting Concrete state diagram one of comparative example 1 of the present invention；
Fig. 4 is the Performance of Self-compacting Concrete state diagram two of comparative example 1 of the present invention；
Fig. 5 is the Performance of Self-compacting Concrete state diagram three of comparative example 1 of the present invention.
Specific implementation mode
Present invention will be described in further detail below with reference to the accompanying drawings, to enable those skilled in the art with reference to specification text
Word can be implemented according to this.
It should be noted that experimental method described in following embodiments is unless otherwise specified conventional method, institute
Reagent and material are stated, unless otherwise specified, is commercially obtained；In the description of the present invention, term " transverse direction ", " vertical
To ", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", the instructions such as "outside" side
Position or position relationship are to be based on the orientation or positional relationship shown in the drawings, and are merely for convenience of description of the present invention and simplification of the description,
It is not instruction or implies that signified device or element must have a particular orientation, with specific azimuth configuration and operation, because
This is not considered as limiting the invention.
Embodiment 1
The raw material of preparation microdilatancy high-performance low gas content amount self-compacting concrete is in the present embodiment：Portland cement, mine
Powder, flyash, rubble, sand, swelling agent, interior curing agent, special additive, mixing water.The mass fraction of feed components matches
For：365 parts of portland cement；70 parts of flyash；50 parts of miberal powder；851 parts of coarse aggregate；825 parts of fine aggregate；2 parts of interior curing agent；It is swollen
Swollen dose 35 parts；7 parts of special additive；195 parts of mixing water.
Special additive includes that water-reducing agent, slump retaining agent, workability conditioning agent, economization agent, high-performance foam stabilizer, high-performance are drawn
Gas agent, viscosity modifier, retarder.Water-reducing agent is polycarboxylate water-reducer in the special additive and mass fraction is 40%,
Slump retaining agent mass fraction is 30%, and workability conditioning agent mass fraction is 20%, and economization agent mass fraction is 14%, and high-performance is steady
Infusion mass fraction is 0.5%, and high performance air-entraining agent mass fraction is 1.0%, and viscosity modifier mass fraction is 0.5%, is delayed
Solidifying agent mass fraction is 1.5%.
Embodiment 2
The raw material of preparation microdilatancy high-performance low gas content amount self-compacting concrete is in the present embodiment：Portland cement, mine
Powder, flyash, rubble, sand, swelling agent, interior curing agent, special additive, mixing water.The mass fraction of feed components matches
For：340 parts of portland cement；60 parts of flyash；50 parts of miberal powder；850 parts of coarse aggregate；850 parts of fine aggregate；2 parts of interior curing agent；It is swollen
Swollen dose 50 parts；8 parts of special additive；180 parts of mixing water.
Special additive includes that water-reducing agent, slump retaining agent, workability conditioning agent, economization agent, high-performance foam stabilizer, high-performance are drawn
Gas agent, viscosity modifier, retarder.Water-reducing agent is polycarboxylate water-reducer in the special additive and mass fraction is 30%,
Slump retaining agent mass fraction is 20%, and workability conditioning agent mass fraction is 15%, and economization agent mass fraction is 11%, and high-performance is steady
Infusion mass fraction is 0.1%, and high performance air-entraining agent mass fraction is 0.5%, and viscosity modifier mass fraction is 0.1%, is delayed
Solidifying agent mass fraction is 1%.
The concrete of implementation 1 and embodiment 2 is successfully answered in the construction of Nanjing Yangtze River Bridge double curvature arched bridge arch rib increasing section
With the project construction has the characteristics that：(1) arch rib increasing section size is small, side 6cm, bottom surface 10cm；(2) new and old coagulation
Native age difference is big, and age difference is more than 50 years, and higher requirement is proposed to drying shrinkage；(3) reinforcing bar interlocks in increasing section, reinforcing bar point
Cloth is intensive, and minimum bar spacing 2.4cm, vibrating spear can not vibrate；(4) using pumping mud-jacking technology, pumping height is more than 10m,
Viscosity and anti-isolation ability for self-compacting concrete propose high requirement；(5) due to construction condition complexity, coagulation
Native haulage time is long, and using pumping mud-jacking technology, speed of perfusion is slow, it requires that self-compacting concrete has fine slump retaining
Energy.
The microdilatancy high-performance low gas content amount self-compacting concrete provided in embodiment 1 and embodiment 2 has microdilatancy, low
The advantages that air content, controllability.
From Fig. 1 and Fig. 2 as it can be seen that the concrete stability of the present invention preferably, without bleeding and discrete phenomena, concrete appearance without
Bubble, it is smooth closely knit, achieve the effect that clear-water concrete.The test data of corresponding effect refers to table 1.
Comparative example 1
The raw material of preparation microdilatancy high-performance low gas content amount self-compacting concrete is in comparative example 1：Cement, miberal powder, fine coal
Ash, rubble, sand, swelling agent, high performance water reducing agent of polyocarboxy acid, mixing water.The mass fraction of feed components matches：Silicate
300 parts of cement；50 parts of flyash；20 parts of miberal powder；700 parts of coarse aggregate；700 parts of fine aggregate；20 parts of swelling agent；Polycarboxylate water-reducer
6 parts；170 parts of mixing water.
Special additive for self-dense concrete is changed to polyacids acid high-performance water reducing agent, self-compacting concrete leakage stone in Fig. 3,
Bleeding, self-compacting concrete J rings round steel nearby blocks in Fig. 4, the poly- heap of self-compacting concrete rubble in Fig. 5.From Fig. 3~5
As it can be seen that self-compacting concrete workability that comparative example 1 makes is bad, aggregate wrapping property is poor, leakage stone is apparent, to water sensitive, hold
Easy bleeding and slump-loss is too fast, easily leads to concrete component and the defects of hole, honeycomb, pitted skin easily occurs.Corresponding effect
Test data refers to table 1.
Embodiment 3
The raw material of preparation microdilatancy high-performance low gas content amount self-compacting concrete is in the present embodiment：Portland cement, mine
Powder, flyash, rubble, sand, swelling agent, interior curing agent, special additive, mixing water.The mass fraction of feed components matches
For：365 parts of portland cement；70 parts of flyash；50 parts of miberal powder；851 parts of coarse aggregate；825 parts of fine aggregate；2 parts of interior curing agent；It is swollen
Swollen dose 35 parts；7 parts of special additive；195 parts of mixing water.
Special additive includes that water-reducing agent, slump retaining agent, workability conditioning agent, economization agent, high-performance foam stabilizer, high-performance are drawn
Gas agent, viscosity modifier, retarder.Water-reducing agent is polycarboxylate water-reducer in the special additive and mass fraction is 40%,
Slump retaining agent mass fraction is 30%, and workability conditioning agent mass fraction is 20%, and economization agent mass fraction is 14%, and high-performance is steady
Infusion mass fraction is 0.5%, and high performance air-entraining agent mass fraction is 1.0%, and viscosity modifier mass fraction is 0.5%, is delayed
Solidifying agent mass fraction is 1.5%.
The preparation method of the present embodiment microdilatancy high-performance low gas content amount self-compacting concrete, includes the following steps：
Step 1：Interior curing agent is impregnated 5h in advance makes its water suction saturation, is prepared into Concrete；
Step 2：According to each component quality proportioning of special additive, container is poured into after each component is weighed well according to the ratio
In, it stirs evenly, then add mixing water so that the solid content of special additive is 25%, is stirred for mixture B；
Step 3：According to the requirement of self-compacting concrete each component match ratio, weigh respectively portland cement, flyash,
Miberal powder, coarse aggregate, fine aggregate, swelling agent, and 1min is stirred in blender, allow each component to be stirred for mixture C；
Step 4：After mixing by the mixing water of the mixture B and surplus that are stirred evenly in step 2, it is slow added into
Mixture A, and continue to stir 2min, it is then slow added into mixture C, self-compaction of the invention can be obtained by persistently stirring 2min
Concrete.
Comparative example 2
The raw material of preparation microdilatancy high-performance low gas content amount self-compacting concrete is in the present embodiment：Portland cement, mine
Powder, flyash, rubble, sand, interior curing agent, swelling agent, special additive, mixing water.The mass fraction of feed components matches
For：365 parts of portland cement；70 parts of flyash；50 parts of miberal powder；851 parts of coarse aggregate；825 parts of fine aggregate；2 parts of interior curing agent；It is swollen
Swollen dose 35 parts；7 parts of special additive；195 parts of mixing water.
Special additive includes that water-reducing agent, slump retaining agent, workability conditioning agent, economization agent, high-performance foam stabilizer, high-performance are drawn
Gas agent, viscosity modifier, retarder.Water-reducing agent is polycarboxylate water-reducer in the special additive and mass fraction is 40%,
Slump retaining agent mass fraction is 30%, and workability conditioning agent mass fraction is 20%, and economization agent mass fraction is 14%, and high-performance is steady
Infusion mass fraction is 0.5%, and high performance air-entraining agent mass fraction is 1.0%, and viscosity modifier mass fraction is 0.5%, is delayed
Solidifying agent mass fraction is 1.5%.
The preparation method of 2 microdilatancy high-performance low gas content amount self-compacting concrete of comparative example, includes the following steps：
Step 1：According to each component quality proportioning of special additive, container is poured into after each component is weighed well according to the ratio
In, it stirs evenly, then add mixing water so that the solid content of special additive is 25%, is stirred for mixture B；
Step 2：According to the requirement of self-compacting concrete each component match ratio, weigh respectively portland cement, flyash,
Miberal powder, coarse aggregate, fine aggregate, swelling agent, interior curing agent, and 1min is stirred in blender, allow each component to be stirred for mixing
Close object C；
Step 3：After mixing by the mixing water of the mixture B and surplus that are stirred evenly in step 2, it is slow added into
Mixture C, self-compacting concrete of the invention can be obtained by persistently stirring 2min.
The portland cement used in embodiment 1, embodiment 2, embodiment 3 and comparative example 1, comparative example 2 is PO 42.5
Portland cement；Miberal powder used is S95 miberal powders；Flyash is I grade of flyash；Swelling agent used is compound swelling agent；
Interior curing agent is spheric granules SAP high hydroscopic resins；Fine aggregate be fineness modulus 2.7 middle sand and middle sand in contain 20%
Grain size is less than the fine sand of 0.1mm；Coarse aggregate is the limestone gravel of 5mm~16mm continuous gradings.
The self-compacting concrete specific performance obtained in embodiment 1, embodiment 2, embodiment 3 and comparative example 1, comparative example 2
As shown in table 1 below：
Each performance parameter of 1 self-compacting concrete of table
It can be seen that from upper table 1：
Compared with comparative example 1, self-compacting concrete various aspects of performance obtained is more excellent, can for embodiment 1 and embodiment 2
Suitable for complicated, narrow space, the concrete increasing section work such as appearance requirement is high, new-old concrete age difference is big
The arch rib increasing section engineering of journey, especially double curvature arched bridge.
Implement 3 compared with comparative example 2, because the pretreatment that internally curing agent carries out, pre-soaking 5h allow it fully to absorb water,
It is stirred mixing again so that concrete various aspects of performance made from embodiment 3 further improves.
Although the embodiments of the present invention have been disclosed as above, but its is not only in the description and the implementation listed
With it can be fully applied to various fields suitable for the present invention, for those skilled in the art, can be easily
Realize other modification, therefore without departing from the general concept defined in the claims and the equivalent scope, the present invention is simultaneously unlimited
In specific details and legend shown and described herein.
Claims (9)
1. microdilatancy high-performance low gas content amount self-compacting concrete, which is characterized in that including the following component counted in parts by weight：
300~450 parts of portland cement, 50~100 parts of flyash, 20~80 parts of miberal powder, 700~900 parts of coarse aggregate, fine aggregate 700
~900 parts, 20~60 parts of swelling agent, 6~8 parts of special additive, 170~200 parts of mixing water.
2. microdilatancy high-performance low gas content amount self-compacting concrete as described in claim 1, which is characterized in that further include：It is interior
2~4 parts of curing agent, is spheric granules SAP high hydroscopic resins, and fineness is 120 mesh.
3. microdilatancy high-performance low gas content amount self-compacting concrete as described in claim 1, which is characterized in that the silicate
Cement is 42.5 Portland cements of PO.
4. microdilatancy high-performance low gas content amount self-compacting concrete as described in claim 1, which is characterized in that the fine aggregate
It is less than the fine sand of 0.1mm in 2.5~2.7 middle sand and 20% grain size including 80% fineness modulus.
5. microdilatancy high-performance low gas content amount self-compacting concrete as described in claim 1, which is characterized in that the coarse aggregate
For the limestone gravel of grain size 5mm~16mm continuous gradings, and flat-elongated particles content≤8%.
6. microdilatancy high-performance low gas content amount self-compacting concrete as described in claim 1, which is characterized in that the flyash
For I grade of ash, miberal powder is S95 types, and the swelling agent is compound swelling agent.
7. microdilatancy high-performance low gas content amount self-compacting concrete as described in claim 1, which is characterized in that described special outer
It includes water-reducing agent, slump retaining agent, workability conditioning agent, economization agent, high-performance foam stabilizer, high performance air-entraining agent, viscosity-adjusting agent to add agent
Agent, retarder.
8. microdilatancy high-performance low gas content amount self-compacting concrete as claimed in claim 7, which is characterized in that described special outer
Adding that water-reducing agent is polycarboxylate water-reducer in agent and mass fraction is 30%~40%, slump retaining agent mass fraction is 20%~30%,
Workability conditioning agent mass fraction is 15%~20%, and economization agent mass fraction is 11%~14%, high-performance foam stabilizer quality
Score is 0.1%~0.5%, and high performance air-entraining agent mass fraction is 0.5%~1.0%, and viscosity modifier mass fraction is
0.1%~0.5%, retarder mass fraction is 1%~1.5%.
9. a kind of preparation method of microdilatancy high-performance low gas content amount self-compacting concrete, which is characterized in that include the following steps：
Step 1：Interior curing agent is impregnated 5h in advance makes its water suction saturation, is prepared into Concrete；
Step 2：According to each component quality proportioning of special additive, pours into container, stir after each component is weighed well according to the ratio
It mixes uniformly, then adds mixing water so that the solid content of special additive is 25%, is stirred for mixture B；
Step 3：According to the requirement of self-compacting concrete each component match ratio, weigh respectively portland cement, flyash, miberal powder,
Coarse aggregate, fine aggregate, swelling agent, and 1min is stirred in blender, allow each component to be stirred for mixture C；
Step 4：After mixing by the mixing water of the mixture B and surplus that are stirred evenly in step 2, it is slow added into mixing
Object A, and continue to stir 2min, it is then slow added into mixture C, self-compaction coagulation of the invention can be obtained by persistently stirring 2min
Soil.
Priority Applications (1)
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| CN109608124A (en) * | 2018-12-10 | 2019-04-12 | 三筑工科技有限公司 | Self-compacting concrete and its preparation method and application |
| CN109665767A (en) * | 2018-11-19 | 2019-04-23 | 青岛崇置混凝土工程有限公司 | Self-compaction frost thawing resistance concrete and preparation method thereof |
| CN110563406A (en) * | 2019-09-27 | 2019-12-13 | 上海市城市建设设计研究总院（集团）有限公司 | Self-compacting concrete suitable for steel structure concrete combination beam combination section |
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| CN109665767A (en) * | 2018-11-19 | 2019-04-23 | 青岛崇置混凝土工程有限公司 | Self-compaction frost thawing resistance concrete and preparation method thereof |
| CN109608124A (en) * | 2018-12-10 | 2019-04-12 | 三筑工科技有限公司 | Self-compacting concrete and its preparation method and application |
| CN110606709A (en) * | 2019-04-12 | 2019-12-24 | 重庆建工建材物流有限公司 | Ultrahigh-strength self-compacting concrete for giant special-shaped steel pipe column and preparation method thereof |
| CN110563406A (en) * | 2019-09-27 | 2019-12-13 | 上海市城市建设设计研究总院（集团）有限公司 | Self-compacting concrete suitable for steel structure concrete combination beam combination section |
| CN110698137A (en) * | 2019-10-29 | 2020-01-17 | 江南大学 | Air-tight concrete material and preparation method thereof |
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| CN110950604A (en) * | 2019-12-17 | 2020-04-03 | 安徽建筑大学 | SAP-based machine-made sand ultra-high-performance concrete and preparation method and application thereof |
| CN110981278A (en) * | 2019-12-30 | 2020-04-10 | 三一筑工科技有限公司 | Concrete admixture and use method thereof |
| CN115073041A (en) * | 2021-03-11 | 2022-09-20 | 北京都市绿源环保科技有限公司 | Additive for controllable low-strength backfill material and preparation method thereof |
| CN115010434A (en) * | 2022-06-13 | 2022-09-06 | 湖南省第三工程有限公司 | Self-compacting concrete and preparation method thereof |
| CN115849811A (en) * | 2022-12-01 | 2023-03-28 | 伊春鹿鸣矿业有限公司 | High-stability self-compacting concrete and preparation method thereof |
| CN115849811B (en) * | 2022-12-01 | 2024-04-19 | 伊春鹿鸣矿业有限公司 | High-stability self-compaction concrete and preparation method thereof |
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