CN106966643B - Jack concrete filled steel tube and preparation method thereof - Google Patents
Jack concrete filled steel tube and preparation method thereof Download PDFInfo
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- CN106966643B CN106966643B CN201710206361.5A CN201710206361A CN106966643B CN 106966643 B CN106966643 B CN 106966643B CN 201710206361 A CN201710206361 A CN 201710206361A CN 106966643 B CN106966643 B CN 106966643B
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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
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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
- C04B2111/00034—Physico-chemical characteristics of the mixtures
- C04B2111/00146—Sprayable or pumpable mixtures
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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
- C04B2201/52—High compression strength concretes, i.e. with a compression strength higher than about 55 N/mm2, e.g. reactive powder concrete [RPC]
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The present invention relates to a kind of jacking concrete filled steel tubes, including the component indicated by following parts by weight: 290-350 parts of cement；160-200 parts of flyash；20-30 parts of silicon powder；720-880 parts of fine aggregate；810-890 parts of coarse aggregate；12.1-15.5 parts of compound additive；155-180 parts of water, wherein the compound additive is made of polycarboxylic acids dehydragent, economization agent, high hydroscopic resin and Sodium Alginate.Compound additive is added in concrete, on the basis of guaranteeing concrete high compressive strength, further decreases the contraction of concrete.
Description
Technical field
The present invention relates to building material technical fields, and specifically, it is related to a kind of jacking concrete filled steel tube and its preparation
Method.
Background technique
With the deeply generation with new construction technology of architecture science theoretical research, high-rise and super high-rise building is increasingly
More, concrete filled steel tube also obtains increasingly extensive application therewith, most has in the pouring construction process of steel duct concrete
The pumping-up method of effect also obtains quickly being widely applied.Pumping jacking technique will using the pumping pressure of concrete pump
Self-compacting concrete is poured into from steel pipe column bottom, is flowed from bottom to top in steel duct, until filling one kind of whole steel pipe column
Concrete without vibration construction method has the characteristics that construction quality is high, short with steel construction not cross-operation, construction period.And this
Concrete on the one hand strength grade with higher is just needed, on the other hand there is good working performance to meet jacking technique
Needs.And although such concrete readily satisfies the requirement of high-strength high workability, but it is larger to be also easy that there are concrete shrinkages
The problem of.
Summary of the invention
The purpose of the present invention is to provide a kind of jacking concrete filled steel tubes, and compound additive is added in concrete, are protecting
On the basis of demonstrate,proving concrete high compressive strength, the contraction of concrete is further decreased.
Above-mentioned purpose of the invention has the technical scheme that a kind of jacking concrete filled steel tube, including
The component indicated by following parts by weight:
Wherein, the compound additive is made of polycarboxylic acids dehydragent, economization agent, high hydroscopic resin and Sodium Alginate.
Polycarboxylic acids dehydragent described further, economization agent, high hydroscopic resin and Sodium Alginate weight ratio be 6-8:
3.8-4.5:0.5-1:1.8-2.5。
Using above technical scheme, cement and water form cement slurry, and cement slurry is wrapped in the surface of coarse aggregate and fine aggregate
And its gap is filled, cement slurry is easy to harden in air, and the materials such as sand, rubble can be bonded together.Fine coal
Ash and silicon powder are used to enhance the workability of concrete, essentially consist in and increase concrete flowability, water-retaining property and cohesiveness.
By polycarboxylic acids dehydragent, economization agent, high hydroscopic resin and Sodium Alginate, cooperate according to aforementioned proportion, on the one hand
For improving the rheological property of concrete and appropriate, stable and closed small bubble can be introduced into concrete, draw
The bubble entered plays similar ball in concrete, so that the mobility of concrete is greatly improved, avoids due to cohesive force mistake
Cause the frictional resistance of concrete to increase greatly, reduces strong concrete in the frictional force into high-rise pumping procedure, may be used also
The phenomenon that reduce bleeding and isolation, further promote the workability of concrete；On the other hand, jacking steel can further be improved
Pipe concrete shrinkage.
When dry after cement slurry aquation, moisture is initially evaporated in capillary, and water-filled pore be about 2.5~
50nm, with the evaporation of capillary internal moisture, the radius of curvature that the water surface declines meniscus reduces, in the surface tension effects of water
Lower generation capillary pipe convergent force generates additonal pressure in gas-liquid interface, causes the mechanical deformation drying shrinkage of concrete.Economization agent exists
Mainly by reducing the surface tension of pore solution in cement-based material, to reduce capillary caused by pore dehydration
Power and play a role；The special comb shaped molecular structure of polycarboxylate water-reducer obtains the dispersion and dispersion stability of cement granules
It improving, the hydration rate of cement granules is improved, part capillary tension offset to reach, reduces the effect of contraction, and
And usually contained PEO branch inherently has Reduce shrinkage effect in polycarboxylate water-reducer；And polycarboxylic acids dehydragent and decrement
Compatibility of the agent in cement-based material is good, and the addition of economization agent can slightly reduce the cement granules mixed with polycarboxylate water-reducer
The zeta current potential on surface, and the PEO branch of polycarboxylic acids is stretched, improve the Reduce shrinkage effect of polycarboxylate water-reducer；Poly- carboxylic
Sour water-reducing agent also has apparent humidification to the Reduce shrinkage effect of economization agent, and can reduce economization agent to cement-based material power
Learn negative effect caused by performance.With the progress of hydrated cementitious, cement mortar internal relative humidity is reduced, high hydroscopic resin
In interior curing water moisture is gradually discharged into cement-based material, make to keep higher humidity inside mortar in a longer period of time
Level reduces inside concrete capillary negative pressure to reduce the self-constriction of concrete, reduces concrete drying shrinkage；And gather
Carboxylic acid water reducer can reduce high hydroscopic resin to negative effect caused by Mechanical Properties of Cement-based Materials.In addition, alginic acid
Sodium and water are mixed to form colloid, increase the viscosity of concrete while introducing bubble, while can generate retarding effect；Sodium Alginate
Insoluble alginates are generated with reacting metal salts such as aluminium, calcium in concrete, the calcium ion of especially divalent passes through ionic bond
After the carboxylic acid group closed on alginic acid strand, calcium ion is enclosed between adjacent strand, forms a class
Like the structure of egg box, nascent calcium alginate fibre forms a kind of high fibrous colloid of water content, can not only delay
Concrete setting also has the function of anticracking.
Preferably, the economization agent polyhydroxy base class economization agent.
By adopting the above technical scheme, a large amount of hydrogen bond is formed after being combined with water, wetting action is played in cement-based material, is mentioned
The dispersibility of concrete is risen, and further decreases the contraction of concrete.
Preferably, the cement is 52.5 class g cements.
The higher cement of strength grade is selected, the compression strength added water and stirred after hardening in air is higher.
Preferably, it is 2.3-2.8 washing river sand that the fine aggregate, which is fineness modulus,.
By adopting the above technical scheme, the washing lower clay content of river sand not only protects the performance of self-compacting concrete mix
Hold benefit, and the contraction of concrete can be effectively reduced.
Preferably, the coarse aggregate is the rubble for the continuous size fraction that partial size is 5-20mm.
By adopting the above technical scheme, the requirement of concrete batching system mobility and intensity can sufficiently be met.
Preferably, a kind of jacking concrete filled steel tube, including the component indicated by following parts by weight:
Using above technical scheme, by matching the jacking concrete filled steel tube constructed above, have good compression strength and
Easy property and decrement property, the proportion are preferred as jacking concrete filled steel tube.
Another object of the present invention is to provide the preparation methods of jacking concrete filled steel tube described above.
Step 1: cement, flyash, silicon powder, coarse aggregate, fine aggregate are imported respective former material feed bin and be homogenized in advance；
Step 2: by flyash, silicon powder, coarse aggregate, fine aggregate according to weight ratio continuous batching, after stirring 1-3 minutes,
The cement and water matched needed for sequentially adding stirs 1-3 minutes；
Step 3: after step 2 stirs 1-3 minutes, compound additive is gradually added into whipping process and continues stirring to institute
Workability is needed, wet feed is obtained.
Above step is selected, Water-reducing Admixtures To Cements adaptability can be made to be improved.
In conclusion the invention has the following advantages:
1, intensity and cohesion are dramatically increased, increases the ability resisted laminated segregation and prevent bleeding, is pumping concrete
It is less likely to occur the separation of water and aggregate during sending, reduces because isolation, bleeding cause to cause plugging due to concrete is uneven
Situation, to be conducive to high-rise pumping；
2, the decrement of concrete is greatly improved.
3, the preparation method for jacking concrete filled steel tube is easy to operate, and material is uniformly mixed, easy to use.
Specific embodiment
Invention is further described in detail with reference to embodiments.
All substances involved in the embodiment of the present invention are commercially available.
Specific raw material involved in embodiment are as shown in table 1.
The specification of each raw material of table 1 and manufacturer
The proportion for jacking concrete filled steel tube is listed by embodiment one to eight.The matter of each component into embodiment eight of embodiment one
Amount proportion is as shown in table 2.
The quality of 2 each component into embodiment eight of embodiment one of table
Said ratio jacking concrete filled steel tube is described below in conjunction with specific preparation method.
Step 1: cement, flyash, silicon powder, rubble, washing river sand are imported respective former material feed bin and be homogenized in advance；
Step 2: the weight continuous batching by flyash, silicon powder, rubble, washing river sand according to embodiment one to eight, stirring
After 1-3 minutes, the cement and water matched needed for sequentially adding is stirred 1-3 minutes；
Step 3: after step 2 stirs 1-3 minutes, being gradually added into whipping process by the proportion of embodiment one to eight poly-
The compound additive that carboxylic acid type water reducing agent, economization agent, high hydroscopic resin and Sodium Alginate form continues to stir to required workability,
Obtain wet feed.
The property of prepared concrete is detected according to GBT50080-2002 " Standard for test methods of properties of ordinary concrete mixture "
Can, self-constriction and Investigation of drying shrinkage of high are detected as follows.
Self-constriction detection: will form 100mm*100mm*515mm concrete sample, be sealed with preservative film, (20 ±
DEG C 2) under the conditions of, using the contactless contraction distortion instrument test concrete of the CABR-NES type Length Contraction later from moulding by casting
Value.
It is dry to shrink: referring to GB/T 50082-2009 " Standard for test methods of longterm performance and durability of ordinary concrete ", inspection
Survey molding 100mm*100mm*515mm concrete sample.The Length Contraction value after concrete hardening is tried after standard curing 3d.
The performance indexes test result for jacking concrete filled steel tube of embodiment one to embodiment eight is as shown in table 3.
The properties for jacking concrete filled steel tube made from 3 embodiment one to embodiment eight of table compare
In summary test result, the jacking concrete filled steel tube 60 days as made from proportion of the embodiment one to embodiment eight it
Compression strength afterwards is relatively high, exists according to jacking concrete filled steel tube slump made from proportion of the embodiment one to embodiment eight
250mm or more, initial slump expansion degree illustrate it with good mobility between 680-700mm；V funnel testing≤
16s illustrates that jacking concrete filled steel tube slump made from the proportion according to embodiment one to embodiment eight has good anti-isolation
Performance, self compacting ability are preferable.It is almost the same from the result of shrinkage and contract with dry rate, wherein concrete made from the proportion of embodiment one
Compression strength, mobility and the equal highest of decrement property, therefore, embodiment one is preferred embodiment.
Comparative example:
Quality proportioning in each comparative example is as shown in table 4.
The quality of 4 each component into comparative example five of comparative example one of table
The performance indexes test result for jacking concrete filled steel tube of comparative example one to comparative example five is as shown in table 5.
The properties for jacking concrete filled steel tube made from 5 comparative example one to comparative example five of table compare
Compared with embodiment one, comparative example one is not added with polycarboxylic acids dehydragent；Comparative example two is not added with economization agent and height
Water-absorbing resin；Comparative example three is not added with economization agent；Comparative example four is not added with high hydroscopic resin；Comparative example five is not added with alginic acid
Sodium.
Compare by test result, does not add polycarboxylic acids dehydragent to the compression strength, mobility and receipts of concrete
Contracting has and relatively influences, illustrate to add economization agent and high hydroscopic resin replace polycarboxylic acids dehydragent to the performance of concrete have compared with
It is big to influence；Not adding economization agent and high hydroscopic resin all can have larger impact to the decrement of concrete, but resist to concrete
Compressive Strength and mobility influence less to illustrate that economization agent and high hydroscopic resin are very big on the shrinkage influence for reducing concrete, and
And the two compounding additive effect is more preferable；Sodium Alginate is not added, and certain influence is had on the mobility of concrete.
This specific embodiment is only explanation of the invention, is not limitation of the present invention, those skilled in the art
Member can according to need the modification that not creative contribution is made to the present embodiment after reading this specification, but as long as at this
All by the protection of Patent Law in the scope of the claims of invention.
Claims (2)
1. a kind of jacking concrete filled steel tube, which is characterized in that including the component indicated by following parts by weight:
290-350 parts of cement
160-200 parts of flyash
20-30 parts of silicon powder
720-880 parts of fine aggregate
810-890 parts of coarse aggregate
12.1-15.5 parts of compound additive
155-180 parts of water,
Wherein, the compound additive is made of polycarboxylic acids dehydragent, economization agent, high hydroscopic resin and Sodium Alginate；
The polycarboxylic acids dehydragent, economization agent, high hydroscopic resin and Sodium Alginate weight ratio be (6-8): (3.8-4.5):
(0.5-1):(1.8-2.5)；The economization agent polyhydroxy base class economization agent；The fine aggregate is that fineness modulus is 2.3-2.8 washing
River sand；The coarse aggregate is the rubble for the continuous size fraction that partial size is 5-20mm；The cement is 52.5 class g cements；
A method of jacking concrete filled steel tube being prepared, step 1: cement, flyash, silicon powder, coarse aggregate, fine aggregate being imported each
It is homogenized in advance from former material feed bin；
Step 2: by flyash, silicon powder, coarse aggregate, fine aggregate according to weight ratio continuous batching, after stirring 1-3 minutes, successively
The cement and water matched needed for being added stirs 1-3 minutes；
Step 3: after step 2 stirs 1-3 minutes, compound additive is gradually added into whipping process and continues stirring to required work
The property made obtains wet feed.
2. jacking concrete filled steel tube according to claim 1, which is characterized in that including the group indicated by following parts by weight
Point:
320 parts of cement
180 parts of flyash
25 parts of silicon powder
800 parts of fine aggregate
860 parts of coarse aggregate
13.8 parts of compound additive
165 parts of water.
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| CN106966643B true CN106966643B (en) | 2019-04-26 |
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| CN114213053A (en) * | 2021-12-02 | 2022-03-22 | 同济大学 | Additive for reducing drying shrinkage of concrete, preparation method and use method thereof |
| CN114524647B (en) * | 2022-02-25 | 2023-03-21 | 华创建筑设计有限公司 | C70 high-strength resin concrete and preparation method and application thereof |
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| CN105906262B (en) * | 2016-04-15 | 2018-02-16 | 湖北大学 | It is a kind of to continue fine expansion control concrete filled steel tube |
| CN106121132A (en) * | 2016-07-05 | 2016-11-16 | 风范绿色建筑（常熟）有限公司 | Lower shrinkage anti-crack concrete outside steel pipe concrete combination column and preparation method thereof |
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