CN107540308A - A kind of high-flowing concrete and preparation method thereof - Google Patents
A kind of high-flowing concrete and preparation method thereof Download PDFInfo
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Abstract
The present invention relates to a kind of high-flowing concrete, the concrete is made up of coarse aggregate, fine aggregate, powder body material, additive and water, and the powder body material includes cement, flyash and miberal powder；The additive includes water reducer and tackifier；The coarse aggregate 0.275m3/m3~0.300m3/m3（Unit absolute volume ratio）, water consumption 166.4kg/m3~176.8kg/m3, gouache ratio is 0.83 0.97, frit materials 510kg/m3~540kg/m3, sand coarse aggregate ratio is 53% ~ 55%, and admixture dosage is 0.95wt% ~ 1.1wt% of powder body material dosage.The present invention is according to box hat immersed tube separation concrete pouring construction technique, the high-flowing concrete performance indications requirement of filling box hat immersed tube separation is determined, by research of the various composition changes to concrete flowability energy, intensity, the heat of hydration and effect of contraction rule, the high-flowing concrete match ratio implementation suitable for box hat immersed tube is formd.
Description
Technical field
The present invention relates to a kind of special concrete, particularly a kind of high-flowing concrete and preparation method thereof, especially relate to
And one kind is poured using pumping technology, it is molded without vibrating, by itself mobility, is filled suitable for box hat immersed tube separation, filling
Property, clearance through and education resistance it is good, intensity is high, the heat of hydration and the relatively low concrete of shrinkage factor.The invention belongs to build neck
Domain.
Background technology
Immersed tube tunnel can be divided into armored concrete immersed tube and box hat immersed tube two types according to pipe shaft material, wherein the former
Europe, South Korea and China are used widely, and the latter simply has application in Japan.Box hat immersed tube no matter outward appearance or in
There is significant difference with the current domestic armored concrete immersed tunnel structure used.
For concrete material, box hat immersed tube has the characteristics that：First, using high-flowing concrete, without shaking
Smash i.e. uniform filling point storehouse box hat structure；Meet second, concrete removes basic mechanical properties during long-term military service
Outside technical requirements, also need to keep good cooperative transformation ability between box hat；Third, concrete should have good volume steady
It is qualitative.
Box hat immersed tube is a kind of combining structure, including box hat structure and the concrete that is filled in box hat structure, wherein steel
Shell structure is made up of various sizes of hollow steel separation, and single separation inner space is 0.5m3~13.5m3, inside compartment
Upper steel plate is respectively provided with L-type steel with lower steel plate and makes steel rib with band steel, and φ 250mm concreting mouth is provided with the middle part of upper top surface,
It is surrounded by φ 50mm steam vent.Space in steel separation between perfusion high-flowing concrete uniform pack ectonexine box hat,
Produce necessary ballast to support, and protect and do not corroded on the inside of the box hat as permanent waterproof measure.Steel-shelled concrete mainly exists
Played a role in terms of anti-floating, stability and mechanical balance, it is desirable to which concrete has fabulous workability, can be sufficient filling with box hat
Internal corner.
Steel separation is the space of closing, and concrete can not be vibrated, and concrete formation state can not pass through naked eyes
Observation, it is difficult to the filling situation of concrete after hardening be confirmed, therefore it is required that the concrete of filling steel separation has good filling
Property and clearance through, vibrate without external force, can be flowed under Gravitative Loads and fill up steel separation inner space.It is meanwhile mixed
Solidifying soil should also have a good education resistance, not bleeding, not upper lower leaf in hardening process.To ensure between box hat and concrete
Gap be no more than 5mm, the heat of hydration of concrete and shrinkage factor should also it is relatively low, volume stability is higher.Existing common coagulation
Soil is difficult to mobility and the self compacting ability requirement for meeting box hat Immersed tunnel, needs a kind of high-flowing concrete and its production system badly
Standby implementation.
The content of the invention
The invention aims to fill up it is domestic lack be exclusively used in the blank of box hat immersed tube fill concrete, there is provided it is a kind of
High-flowing concrete, facilitate corresponding construction application needs.
The specific match ratio scheme of concrete that the present invention researchs and proposes, adjust and determine by a large amount of trial mixs, suitable for pouring
Box hat immersed tube separation, it can be flowed under Gravitative Loads and fill up steel separation inner space, and concrete is without bleeding, upper lower leaf
Phenomena such as, it is ensured that the gap between box hat and concrete is no more than 5mm.Meet steel-shelled concrete module in the Zhuhai and Macao bridge project of port
Prepare the concrete performance requirement applied in processing.
In order to realize foregoing invention purpose, the present invention provides a kind of technical scheme：
A kind of high-flowing concrete, the concrete are made up of coarse aggregate, fine aggregate, powder body material, additive and water, institute
Stating powder body material includes cement, flyash and miberal powder；The additive includes water reducer and tackifier.
The coarse aggregate 0.275m3/m3~0.300m3/m3(unit absolute volume ratio),
Water consumption 166.4kg/m3~176.8kg/m3,
Gouache ratio is 0.83~0.97, and preferably gouache ratio is 0.88~0.92,
Frit materials 510kg/m3~540kg/m3,
Sand coarse aggregate ratio is 53%~55%,
Admixture dosage is 0.95%~1.1wt% of powder body material dosage.
Preferably, the additive includes tackifier, and the tackifier volume is 0.6wt%~0.8wt% of additive,
Remaining component is water reducer.
There is significant difference in the high-flowing concrete of the present invention, the application for sand coarse aggregate ratio with existing general concrete
Control range is that 53%-55% is in higher level, on the basis of concrete strength and workability is improved, control well
The overall flow of concrete.The mixing water application of cooperation decision design, and appropriate additive optimised coagulation soil are whole
Liquid flowability so that concrete has high fluidity, and meet box hat immersed tube prepares needs.
Wt%：That is mass percent.
Concrete inevitably includes partial air, using powder body material, coarse aggregate, fine aggregate, additive, mixing water
And appropriate air forms high-flowing concrete of the present invention, performance indications meet high-flowing concrete requirement.
Further, in the powder body material：The volume ratio of cement is 45%~50%, and the volume ratio of flyash is
30%~40%, the volume ratio of miberal powder is 14%~15%.The each component total amount sum of powder body material is 100%, if
Without other powder body materials, then above-mentioned three kinds of powder body materials total amount sum should be 100%.
Preferably, the volume ratio of cement is 45%~50%, and the volume ratio of flyash is 35%~40%, miberal powder
Volume ratio is 14%~15%.
Preferably, the volume ratio of the cement is 48%~49%, and the volume ratio of flyash is 36.5%~38%,
The volume ratio of miberal powder is 14.0%~14.8%.
Most preferably, the volume ratio of the cement is 48.5%, and the volume ratio of flyash is 37.1%, the body of miberal powder
Product is than being 14.4%.
Further, the dosage of the coarse aggregate is 0.275m3/m3~0.293m3/m3.The absolute body of concrete rough aggregate unit
Product control within this range, can be very good to cooperate with fine aggregate, the application amount of powder body material so that the overall co-ordination of concrete
Can be outstanding and prominent.
Further, the coarse aggregate is rubble, and rubble specification is 5~20mm rubbles.
Further, the dosage of the water is 166.4kg/m3~176.8kg/m3.The ratio of mixing water is controlled in this scope,
Concrete unit consumption of water is to realize that concrete mixes and stirs one of foundation factors with good fluidity, mixing water and additive
's.
Further, fine aggregate is river sand, middle sand.
Further, the concrete gouache ratio 0.88~0.92.Gouache ratio refers to the volume ratio of water/powder, and powder refers to
Cementing material and inertia (or half inertia) mineral spike (such as agstone, rubble powder), mobility of the gouache ratio for concrete
With large effect.
Further, the cement is the cement of PII42.5 ranks.
Further, the flyash is I grade of flyash.
Further, the additive is polycarboxylate water-reducer.
Further, the concrete powder material usage is 510kg/m3~530kg/m3。
Preferably, unit powder body material absolute volume 0.184m3/m3~0.191m3/m3。
The further excellent concrete admixture volume is 0.95%~1.0% (mass ratio) of powder body material dosage, institute
It is tackifier to state 0.6%~0.8% in additive (mass ratio), and remaining component is water reducer.
Further, the concrete performance index control is as follows：
Slump flow test：650mm ± 50mm,
T500Reach the time：3s~15s,
V75The funnel delivery time：5s~15s,
U-shaped instrument packed height is not less than 300mm,
Air content is no more than 5%,
Unit weight is not less than 2300kg/m3,
Normal pressure bleeding rate is 0,
28d compression strength is C50.
High-flowing concrete match ratio and its implementation of the present invention, filled suitable for box hat immersed tube separation, using pump
Send technique to pour, without vibrating, be molded by itself mobility, intensity good with fillibility, clearance through and education resistance
The characteristics of height, the heat of hydration and relatively low shrinkage factor.
High-flowing concrete of the present invention is according to box hat immersed tube separation concrete pouring construction technique, it is determined that filling box hat
The high-flowing concrete performance indications requirement of immersed tube separation, by various composition changes to concrete flowability energy, intensity, water
Change the research of heat and effect of contraction rule, high-flowing concrete match ratio is preferably determined, and form and sunk suitable for box hat
The high-flowing concrete match ratio implementation of pipe.
New solution provided by the invention can mainly realize following technique effect：
1. the high-flowing concrete of the present invention is compared with existing general concrete, high and and easy with concrete strength
Property it is good the characteristics of, concrete overall flow is outstanding, can be good at fill box hat structure, prepare high-quality box hat immersed tube.
2. the application percentage matching relationship of coarse aggregate and fine aggregate is good in the high-flowing concrete of the present invention, concrete
Overall mobility performs better outstanding compared with general concrete.
3. the present invention optimizes from the application relation of each composition of concrete, sand coarse aggregate ratio, gouache ratio, additive, tackifier
Etc. the mutually coordinated cooperation of application amount, the concrete flowability energy for being optimal.
Brief description of the drawings：
Fig. 1 is pigment volume ratio to T500Divergence reaches the influence of time.
Fig. 2 is influence of the pigment volume ratio to the V-arrangement funnel delivery time.
Fig. 3 is influence of the coarse aggregate unit volume to U-shaped instrument packed height.
Fig. 4 is air content to T500Divergence reaches the influence of time.
Fig. 5 is influence of the air content to the V-arrangement funnel delivery time.
Fig. 6 is influence of the tackifier to slump flow test and U-shaped instrument packed height.
Fig. 7 is standard curing different water-binder ratios concrete crushing strength changing rule.
Fig. 8 is cured under same condition different water-binder ratios concrete crushing strength changing rule.
Fig. 9 is the hydration heat speed of cementitious material system hydro heat dissipation law.
Figure 10 is the hydration heat amount of cementitious material system hydro heat dissipation law.
Figure 11 is Adiabatic temperature rise of concrete.
Figure 12 is concrete drying shrinkage.
Embodiment
With reference to test example and embodiment, the present invention is described in further detail.But this should not be understood
Following embodiment is only limitted to for the scope of the above-mentioned theme of the present invention, it is all that this is belonged to based on the technology that present invention is realized
The scope of invention.
Specification/property of the various raw material used in various embodiments of the present invention is as follows：
Cement：P·II42.5；Flyash：I levels；Slag powders：S95 levels；River sand：Middle sand；Rubble：5~20mm of particle diameter；Outside
Add agent：Poly carboxylic acid series water reducer.The raw material of above-mentioned specification/property rank are used unless stated otherwise.
<Embodiment 1>
Prepare high-flowing concrete
Concrete takes raw material according to every cube of following ratio：
Rubble 765.9kg/m3；(rubble apparent density is 2700kg/m3)
River sand 863.6kg/m3；(river sand apparent density is 2640kg/m3, sand coarse aggregate ratio 53%)
Cement 286kg/m3；(cement apparent density is 3140kg/m3)
Flyash 156kg/m3；(apparent density of flyash is 2240kg/m3)
Miberal powder 78kg/m3；(apparent density of miberal powder is 2900kg/m3)
Water 171.6kg/m3；
Additive 5.2kg/m3, wherein tackifier account for 8.0%, and remaining is water reducer.
It is uniformly mixed to obtain high-flowing concrete.
The high fluidity match ratio of table 1
The high-flowing concrete workability of table 2
Other performances of the high-flowing concrete of table 3
According to concrete shrinkage and adiabatic temperature rise, coagulation in least favorable Under Concrete hardening process is calculated according to the following formula
Gap between soil and box hat：
μ=(T α+ζ) h
In above formula：μ --- the gap between concrete and box hat, mm；
The adiabatic temperature rise of T --- concrete, DEG C；
The linear expansion coefficient of α --- concrete, 10 × 10-6℃-1；
ζ --- the contraction of cured under same condition concrete, × 10-6；
H --- steel separation maximum height, mm.
It is 1.4mm to calculate the gap between least favorable condition concrete and box hat according to above formula, and the design no more than 5mm refers to
Mark, meet the requirement of steel-shelled concrete fillibility.
The result situation of concrete test performance in consolidated statement 2- tables 3, it can be seen that high fluidity coagulation of the invention
The overall performance of soil meets every demand, its slump flow test, V75Funnel time, T500, U rows packed height, bleeding rate, gassiness
Amount, unit weight, intensity, drying shrinkage, adiabatic temperature rise etc. all meet setting for port Zhuhai and Macao bridge immersed tube joint steel-shelled concrete
Meter requires.High-flowing concrete manufactured in the present embodiment is preferred plan of the invention, to be finally applied to immersed tube joint
High-flowing concrete.
<Embodiment 2>
Concrete：Pigment volume ratio 0.83~0.97, gel material content 520kg/m3, binder materials volume ratio
The miberal powder of+37.1% flyash of 48.5% cement+14.4%, sand coarse aggregate ratio 52%~54%, water-cement ratio 0.30~0.35, admixture dosage
0.8%~1.2% (0.8% is tackifier in additive).Concrete batching examines its service behaviour (T500When divergence reaches
Between, the V-arrangement funnel delivery time), T of the pigment volume ratio to high-flowing concrete500Divergence has material impact, as a result such as
Shown in Fig. 1, as pigment volume ratio increases, T500Time reduces rapidly, flowing velocity increase, mobility enhancing, pigment volume ratio
Increase to 0.89, T500Time is down to below 5s.
Pigment volume ratio has a significant impact to the V-arrangement funnel delivery time of high-flowing concrete, as a result as shown in Fig. 2
With the increase of pigment volume ratio, the V-arrangement funnel delivery time reduces, and pigment volume ratio increases to 0.89, V-arrangement funnel delivery time drop
To below 15s, continue to increase gouache ratio, V-arrangement funnel delivery time fall off rate slows down, and reaches when pigment volume ratio is 0.94
To minimum, hereafter gouache ratio increases, and concrete cohesiveness, education resistance reduce, it is impossible to is continuously flowed out from funnel, during presentation
Continuous Caton phenomenon, V-arrangement funnel delivery time increase on the contrary when disconnected.During experiment, while it also found and work as pigment volume ratio
When increasing to 0.97, there is slight bleeding.
It is preferred, therefore, that control gouache ratio 0.88~0.92.
<Embodiment 3>
Concrete：Water-cement ratio 0.33, gel material content 520kg/m3, binder materials is 48.5% water of volume ratio
The miberal powder of the flyash of mud+37.1%+14.4%, 0.26~0.33m of coarse aggregate Amount per unitvolume3/m3, additive 0.9~1.1%
(0.8% is tackifier in additive).
Coarse aggregate unit volume is mainly reflected in out machine concrete bag to the regular influence of high flowing concrete workability
In the property wrapped up in and U-shaped instrument packed height.Influence of the coarse aggregate unit volume to U-shaped instrument packed height is as shown in Figure 3.With rough set
Expect the reduction of unit volume, U-shaped instrument packed height gradually increases, and Concrete Filled, education resistance and clearance through improve,
When coarse aggregate unit volume is down to 0.29m3/m3When, packed height rises to 331mm, and U-shaped instrument both sides filler difference in height is reduced to
18mm.Coarse aggregate unit volume influences notable on fillibility, the clearance through of concrete mix, it is necessary to is controlled suitable
Work as scope.
<Embodiment 4>
Concrete：Water-cement ratio 0.33, water consumption 171.6kg/m3, gel material content 520kg/m3, binder materials is
The miberal powder of+37.1% flyash of 48.5% cement+14.4% of volume ratio, sand coarse aggregate ratio 53%, additive 0.9~1.1% is (in additive
0.8% is tackifier).Extra addition bleed, antifoam composition, concrete mix air content is controlled in 1.6%-4.5% models
Enclose.
Air content is to T500Divergence reaches the influence of time as shown in figure 4, presenting substantially as air content increases, flowing
Speed is accelerated, T500Divergence reaches the trend gradually reduced the time, and 500mm is rapidly achieved as slump cone lifts concrete
Divergence, but its flowing time is not lasting, stops flowing soon.When particularly air content increases to 4.5%, " stream is shown as
It is fast fast, but flow not far " state.
Influence of the air content to the V-arrangement funnel delivery time is as shown in figure 5, linear correlation, as air content increases, is mixed
Native encapsulation, cohesiveness raising are coagulated, education resistance can strengthen, and Concrete Filled thing continuously, quickly can be gone out by V-arrangement funnel
Mouthful, the V-arrangement funnel delivery time substantially reduces.Generally, influence of the air content change to high-flowing concrete workability be more
Complexity, air content increase, slurry strengthen with the encapsulation that thickness is gathered materials, and agent on crack resistance of concrete isolation performance improves, but simultaneously because bag
The property wrapped up in strengthens, and reduces the flow distance of concrete to a certain extent.
High-flowing concrete is more closed concrete 's air-containing control by adding bleed, antifoam composition below 4%
It is suitable.
<Embodiment 5>
Concrete：Water-cement ratio 0.33, gel material content 520kg/m3, binder materials is 48.5% water of volume ratio
The miberal powder of the flyash of mud+37.1%+14.4%, sand coarse aggregate ratio 55%, additive 0.9~1.1%.Change in the range of 0.4~1.2% outer
Add the volume of tackifier component in agent, influence of the tackifier volume to slump flow test and U-shaped instrument packed height as shown in fig. 6,
Tackifier are anionic and are combined in water reducer that its volume is the mass percent for accounting for water reducer dosage, with thickening
Agent volume increases, and concrete cohesiveness strengthens with anti-isolation, the increase of U-shaped instrument packed height, but its slump flow test decreases.
During concrete mixing, find, with the increase of tackifier volume, have to concrete water bleeding and significantly improve, when volume increase
It is 0.5% to stand bleeding rate to concrete when 0.6%, and after volume increases to 0.8% and the above, concrete occurs without bleeding again.
<Embodiment 6>
Concrete：Gel material content keeps 520kg/m3Constant, binder materials composition is volume ratio：48.5% water
The miberal powder of the flyash of mud+37.1%+14.4%, sand coarse aggregate ratio is finely tuned in the range of sand coarse aggregate ratio 52%~54%, additive 0.8~1.2% is (additional
0.8% is tackifier in agent), change water-cement ratio, influence of the comparative analysis water-cement ratio for concrete strength from 0.31~0.35.
Standard curing condition different water-binder ratios high-flowing concrete compression strength with age changing rule as shown in fig. 7,
Each group concrete gradually increases as age increases intensity, and 7d intensity is all higher than 40MPa, and 28d intensity is all higher than 50MPa, and 56d is strong
Degree is all higher than 60MPa.Each age concrete compression strength follows that water-cement ratio is lower substantially, the higher rule of intensity, wherein 0.31
Water-cement ratio concrete strength alreadys exceed 70MPa in 28d ages, and 56d age strengths have exceeded 80MPa, and Strength surplus amount is too high.
Water-cement ratio is that compression strength of 0.35 concrete in 28d ages is far below other several groups of concrete, only 55.6MPa, intensity richness
Surplus is relatively low.
Cured under same condition different water-binder ratios high-flowing concrete compression strength is with age changing rule as shown in figure 8, same
Condition maintenance is simulation box hat interior sealing environment, fencing lawn immediately after concrete formation, is exchanged with extraneous no moisture.Same condition
Curing concrete compression strength changing rule and standard curing condition difference are little, but within 3d~7d ages, water-cement ratio is
0.31~more than 0.34 groups of concrete strengths are closer to, and the gain in strength that water-cement ratio is 0.31 after 28d is rapid, hence it is evident that high
In other several groups of concrete.On the whole, cured under same condition test specimen is due to without external world's maintenance moisture supplement, each age concrete resistance to compression
Intensity is slightly below standardized test sample of maintenance substantially, and the strength difference before 28d is more bigger, 28d ages and its afterwards strong
It is more slightly smaller to spend difference.
So water-cement ratio control is no more than 0.34.
<Embodiment 7>
Concrete：Water-cement ratio 0.33, gel material content keep 520kg/m3Constant, binder materials composition is pure for A
Cement system, the miberal powder system of+37.1% flyash of 48.5% cement of B volume ratios+14.4%, sand is finely tuned in the range of sand coarse aggregate ratio 55%
Rate, additive 0.9-1.1%.
Improve the exothermicity of cementitious material system using blending flyash and miberal powder, its rate of heat release changes with thermal discharge
Rule is as shown in Fig. 9-Figure 10.Compared with striaght cement system, cement, the water of cementitious material system are substituted using flyash+miberal powder
Change rate of heat release, heat release total amount substantially reduce, and rate of heat release increases and slowed down with reduction trend before and after maximum heatrelease rate occurs, and
There is the appearance of heat release submaximum after heat release main peak, the heat release rate profile of whole exothermic process also tends to gently.Blending flyash
With miberal powder system 72h thermal discharges be striaght cement system 65%, maximum heatrelease rate be striaght cement system 45% or so, favorably
In reducing hydration heat of concrete, the temperature shrinkage of concrete is controlled.So part flyash and miberal powder that the present invention uses substitute
The binder materials combined system of cement is more beneficial for high-flowing concrete and poured to be applied among the box hat of closing, controls
The effect that concrete temperature shrinks is more preferable, and the quality of realization is more preferably.
<Embodiment 8>
Utilize the miberal powder system concrete batching of+37.1% flyash of 48.5% cement+14.4%, water-cement ratio 0.33, glue
Gel material dosage 470kg/m3~570kg/m3, sand coarse aggregate ratio is adjusted in the range of 47%~55%, is finely tuned in the range of 0.90%~1.05%
Water reducer dosage, temperature stress testing machine test binder materials changes the influence to Adiabatic temperature rise of concrete, specifically such as Figure 11 institutes
Show.
Gel material content changes has good linear dependence between Adiabatic temperature rise of concrete, with binder materials
The increase of dosage, adiabatic temperature rise increase therewith, are calculated according to linear fit formula, often increase 10kg/m3The gelling of same system
Material, Adiabatic temperature rise of concrete improve 1.4 DEG C.
<Embodiment 9>
The miberal powder system of+37.1% flyash of 48.5% cement+14.4% is tested, gel material content is in 490kg/m3~
540kg/m3The drying contraction change rule such as Figure 12 of the high-flowing concrete of scope under standard curing and cured under same condition
It is shown.
The standard curing of 90d ages, the contraction of drying of cured under same condition concrete follow as gel material content increases substantially
The rule for adding and increasing, cured under same condition test specimen exchange with extraneous no moisture, basic not because of moisture in course of hardening
Lost and caused contraction, therefore it is dried contraction and is significantly less than standardized test sample of maintenance.When gel material content is 520kg/m3,
The relative intensity for handling relatively low scope, considering concrete of the concrete drying shrinkage rate of standard curing and cured under same condition
Influence, from 520kg/m3Binder materials prepare high-flowing concrete it is more satisfactory.
Claims (10)
1. a kind of high-flowing concrete, the concrete is made up of coarse aggregate, fine aggregate, powder body material, additive and water, described
Powder body material includes cement, flyash and miberal powder；The additive includes water reducer and tackifier；
The coarse aggregate 0.275m3/m3~0.300m3/m3（Unit absolute volume ratio）,
Water consumption 166.4kg/m3~176.8kg/m3,
Gouache ratio is 0.83-0.97,
Frit materials 510kg/m3~540kg/m3,
Sand coarse aggregate ratio is 53% ~ 55%,
Admixture dosage is 0.95% ~ 1.1wt% of powder body material dosage,
The additive includes tackifier, and the tackifier volume is 0.6wt% ~ 0.8wt% of additive, and remaining component is diminishing
Agent.
2. high-flowing concrete as claimed in claim 1, it is characterised in that in the powder body material：The volume ratio of cement
For 45% ~ 50%, the volume ratio of flyash is 30% ~ 40%, and the volume ratio of miberal powder is 14%-15%；Each group of the powder body material
It is 100% to divide total amount sum.
3. high-flowing concrete as claimed in claim 2, it is characterised in that the volume ratio of the cement is 45% ~ 50%, powder
The volume ratio of coal ash is 35% ~ 40%, and the volume ratio of miberal powder is 14% ~ 15%.
4. high-flowing concrete as claimed in claim 1, it is characterised in that the dosage of the coarse aggregate is 0.275m3/m3~
0.293m3/m3。
5. high-flowing concrete as claimed in claim 1, it is characterised in that the coarse aggregate is rubble, and rubble specification is 5-
20mm rubbles.
6. high-flowing concrete as claimed in claim 1, it is characterised in that the concrete gouache ratio 0.88 ~ 0.92.
7. high-flowing concrete as claimed in claim 1, it is characterised in that the cement is the cement of PII42.5 ranks.
8. high-flowing concrete as claimed in claim 1, it is characterised in that the concrete powder material usage is 525kg/
m3~535kg/m3。
9. high-flowing concrete as claimed in claim 1, it is characterised in that the concrete admixture volume is powder body material
The 0.95% ~ 1.0% of dosage（Mass ratio）, 0.6% ~ 0.8% in the additive（Mass ratio）For tackifier, remaining component is diminishing
Agent.
10. high-flowing concrete as claimed in claim 1, it is characterised in that the concrete performance index control is as follows：
Slump flow test：650mm ± 50mm,
T500Reach the time：3s ~ 15s,
V75The funnel delivery time：5s ~ 15s,
U-shaped instrument packed height is not less than 300mm,
Air content is no more than 5%,
Unit weight is not less than 2300kg/m3,
Normal pressure bleeding rate is 0,
28d compression strength is C50.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108658547A (en) * | 2018-08-09 | 2018-10-16 | 平乡县世恒新型建材有限公司 | Self-compacting concrete |
| CN110540393A (en) * | 2019-09-30 | 2019-12-06 | 中交第四航务工程局有限公司 | anti-cracking self-waterproof concrete and preparation method thereof |
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| CN107540308B (en) | 2021-01-26 |
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