CN106966643A - Jacking concrete filled steel tube and preparation method thereof - Google Patents
Jacking concrete filled steel tube and preparation method thereof Download PDFInfo
- Publication number
- CN106966643A CN106966643A CN201710206361.5A CN201710206361A CN106966643A CN 106966643 A CN106966643 A CN 106966643A CN 201710206361 A CN201710206361 A CN 201710206361A CN 106966643 A CN106966643 A CN 106966643A
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- Prior art keywords
- steel tube
- filled steel
- concrete
- concrete filled
- jacking
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Classifications
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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
-
- 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
-
- 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]
Abstract
The present invention relates to a kind of jacking concrete filled steel tube, including the component represented by following parts by weight：290 350 parts of cement；160 200 parts of flyash；20 30 parts of silica flour；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 up of polycarboxylic acids dehydragent, economization agent, high hydroscopic resin and Sodium Alginate.Compound additive is added in concrete, on the basis of concrete high compressive strength is ensured, the further contraction of reduction concrete.
Description
Technical field
The present invention relates to building material technical field, specifically, it is related to a kind of jacking concrete filled steel tube and its preparation
Method.
Background technology
With the generation deeply with new construction technology of architecture science theoretical research, high-rise and high-rise building is increasingly
Many, concrete filled steel tube also obtains most having in increasingly extensive application, the pouring construction process of steel duct concrete therewith
The pumping-up method of effect, is also obtained quickly and extensive use.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, with construction quality it is high, with steel construction not cross-operation, the construction period is short the features such as.And this
On the one hand be accomplished by concrete has higher strength grade, on the other hand meets jacking technique with good service behaviour
The need for.And although such concrete readily satisfies the requirement of high-strength high workability, but it is larger also easily to there is concrete shrinkage
The problem of.
The content of the invention
It is an object of the invention to provide a kind of jacking concrete filled steel tube, compound additive is added in concrete, is being protected
Demonstrate,prove on the basis of concrete high compressive strength, further reduce the contraction of concrete.
The present invention above-mentioned purpose technical scheme is that：A kind of jacking concrete filled steel tube, including
The component represented by following parts by weight：
Wherein, the compound additive is made up of polycarboxylic acids dehydragent, economization agent, high hydroscopic resin and Sodium Alginate.
Polycarboxylic acids dehydragent described further, economization agent, the weight ratio of high hydroscopic resin and Sodium Alginate are 6-8:
3.8-4.5:0.5-1:1.8-2.5。
Using above technical scheme, cement is wrapped in the surface of coarse aggregate and fine aggregate with water formation cement mortar, cement mortar
And its space is filled, cement slurry is easily hardened in atmosphere, and the materials such as sand, rubble can be bonded together.Fine coal
Ash and silica flour are used to strengthen the workability of concrete, essentially consist in increase concrete flowability, water-retaining property and cohesiveness.
By polycarboxylic acids dehydragent, economization agent, high hydroscopic resin and Sodium Alginate, coordinate according to aforementioned proportion, on the one hand
For improving the rheological property of concrete and small bubble that is appropriate, stable and closing can be introduced into concrete, draw
The bubble entered plays similar ball in concrete, the mobility of concrete is greatly improved, it is to avoid due to cohesive force mistake
Cause the frictional resistance of concrete to increase greatly, reduce strong concrete in the frictional force into high-rise pumping procedure, may be used also
To reduce the phenomenon of bleeding and isolation, the workability of concrete is further lifted；On the other hand, jacking steel can further be improved
Pipe concrete shrinkage.
When being dried 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, i.e., produce additonal pressure in gas-liquid interface, cause the mechanical deformation drying shrinkage of concrete.Economization agent exists
It is main by reducing the surface tension of pore solution in cement-based material, so as to reduce the capillary produced by pore dehydration
Power and play a role；The special comb shaped molecular structure of polycarboxylate water-reducer causes the dispersion and dispersion stability of cement granules to obtain
Improve, the hydration rate of cement granules is improved, so as to reach counteracting part capillary tension, reduce the effect shunk, and
And usual contained PEO side chains inherently have 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 potentials on surface, and the PEO side chains of polycarboxylic acids are stretched, improve the Reduce shrinkage effect of polycarboxylate water-reducer；Poly- carboxylic
Sour water reducer also has obvious humidification to the Reduce shrinkage effect of economization agent, and can reduce economization agent to cement-based material power
Learn the negative effect produced by performance.With the progress of hydrated cementitious, the reduction of cement mortar internal relative humidity, high hydroscopic resin
In interior curing water moisture is gradually discharged into cement-based material, make to keep higher humidity inside mortar in longer time
Level, so as to reduce the self-constriction of concrete, reduces inside concrete capillary negative pressure, reduces concrete drying shrinkage；And gather
Carboxylic acid water reducer can reduce high hydroscopic resin to the negative effect produced by Mechanical Properties of Cement-based Materials.In addition, alginic acid
Sodium is mixed to form colloid with water, increases the viscosity of concrete while introducing bubble, while retarding effect can be produced；Sodium Alginate
Insoluble alginates are generated with the reacting metal salt such as the aluminium in concrete, calcium, the calcium ion of especially divalence passes through ionic bond
After the hydroxy-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, the also function with anticracking.
It is preferred that, the economization agent polyhydroxy base class economization agent.
Using above-mentioned technical proposal, substantial amounts of hydrogen bond is formed after being combined with water, wetting action is played in cement-based material, is carried
The dispersiveness of concrete is risen, and further reduces the contraction of concrete.
It is preferred that, the cement is 52.5 class g cements.
From the higher cement of strength grade, the compression strength after the stirring that adds water is hardened in atmosphere is higher.
It is preferred that, the fine aggregate is that modulus of fineness is 2.3-2.8 washing river sands.
Using above-mentioned technical proposal, the relatively low clay content of washing river sand is not only protected to the performance of self-compacting concrete mix
Hold profit, and the contraction of concrete can be effectively reduced.
It is preferred that, the coarse aggregate is the rubble for the continuous size fraction that particle diameter is 5-20mm.
Using above-mentioned technical proposal, the requirement of concrete batching system mobility and intensity can be fully met.
It is preferred that, a kind of jacking concrete filled steel tube, including the component represented by following parts by weight：
Using above technical scheme, the jacking concrete filled steel tube constructed is matched more than, with good compression strength and
Easy property and decrement property, should match somebody with somebody and be used for the preferred of jacking steel pipe concrete.
Another object of the present invention is to provide the preparation method of jacking concrete filled steel tube described above.
Step 1：Cement, flyash, silica flour, coarse aggregate, fine aggregate are imported respective former material feed bin and be homogenized in advance；
Step 2：By flyash, silica flour, coarse aggregate, fine aggregate according to part by weight continuous batching, after stirring 1-3 minutes, successively
The cement and water of proportioning needed for adding are stirred 1-3 minutes；
Step 3：After step 2 is stirred 1-3 minutes, compound additive is gradually added into whipping process and continues to stir to required work
The property made, obtains wet feed.
It from above step, can be improved Water-reducing Admixtures To Cements adaptability.
In summary, the invention has the advantages that：
1st, intensity and cohesion are dramatically increased, increase resists laminated segregation and prevents the ability of bleeding, is pumping concrete
It is less likely to occur the separation of water and aggregate in journey, reduction concrete caused by isolation, bleeding is uneven and causes the situation of plugging,
So as to be conducive to high-rise pumping；
2nd, the decrement of concrete is greatly improved.
3rd, the preparation method of jacking concrete filled steel tube is simple to operate, and material is well mixed, easy to use.
Embodiment
The present invention is described in further detail with reference to embodiments.
The all substances being related in the embodiment of the present invention are commercially available.
The specific raw material being related in embodiment are as shown in table 1.
The specification of each raw material of table 1 and manufacturer
The proportioning of jacking concrete filled steel tube is listed by embodiment one to eight.The quality of each component into embodiment eight of embodiment one is matched somebody with somebody
Than as shown in table 2.
The quality of each component into embodiment eight of embodiment one of table 2
Said ratio jacking concrete filled steel tube is described below in conjunction with specific preparation method.
Step 1：Cement, flyash, silica flour, rubble, washing river sand are imported respective former material feed bin and be homogenized in advance；
Step 2：By flyash, silica flour, rubble, washing river sand according to the weight continuous batching of embodiment one to eight, 1-3 points of stirring
Zhong Hou, the cement and water of proportioning needed for sequentially adding are stirred 1-3 minutes；
Step 3：After step 2 is stirred 1-3 minutes, polycarboxylic acids is gradually added into by the proportioning of embodiment one to eight in whipping process
Class water reducer, economization agent, the compound additive continuation of high hydroscopic resin and Sodium Alginate composition are stirred to required workability, are obtained
Wet feed.
According to GBT50080-2002《Standard for test methods of properties of ordinary concrete mixture》Detect the property of the concrete prepared
Can, self-constriction and Investigation of drying shrinkage of high are detected as follows.
Self-constriction is detected：100mm*100mm*515mm concrete samples will be molded, will be sealed with preservative film, (20 ±
DEG C 2) under the conditions of, concrete is tested from the later Length Contraction of moulding by casting using the contactless contraction distortion instrument of CABR-NES types
Value.
Dry and shrink：With reference to GB/T 50082-2009《Standard for test methods of longterm performance and durability of ordinary concrete》, inspection
Survey shaping 100mm*100mm*515mm concrete samples.The Length Contraction value after concrete hardening is tried after standard curing 3d.
Embodiment one is as shown in table 3 to the property indices test result of the jacking concrete filled steel tube of embodiment eight.
The embodiment one of table 3 to the properties of jacking concrete filled steel tube made from embodiment eight compare
In summary test result, jacking concrete filled steel tube is after 60 days as made from embodiment one to the proportioning of embodiment eight
Compression strength is higher, according to jacking concrete filled steel tube slump made from embodiment one to the proportioning of embodiment eight in 250mm
More than, initial slump expansion degree illustrates that it has good mobility between 680-700mm；V funnel testings≤16s, explanation
There is good education resistance energy according to jacking concrete filled steel tube slump made from embodiment one to the proportioning of embodiment eight, from close
Reality is preferable.Result from shrinkage and contract with dry rate is basically identical, concrete crushing strength wherein made from the proportioning of embodiment one,
Mobility and the equal highest of decrement property, therefore, embodiment one is preferred scheme.
Comparative example：
Quality proportioning in each comparative example is as shown in table 4.
The quality of each component into comparative example five of comparative example one of table 4
Comparative example one is as shown in table 5 to the property indices test result of the jacking concrete filled steel tube of comparative example five.
The comparative example one of table 5 to the properties of jacking concrete filled steel tube made from comparative example five 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 high water absorption
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 Sodium Alginate.
Compare by test result, without compression strength, mobility and receipts of the polycarboxylic acids dehydragent to concrete
Contracting have relatively influence, illustrate addition economization agent and high hydroscopic resin instead of polycarboxylic acids dehydragent have to the performance of concrete compared with
Big influence；Can all there is considerable influence to the decrement of concrete without economization agent and high hydroscopic resin, but concrete is resisted
Compressive Strength and mobility influence are little, illustrate that the shrinkage influence of economization agent and high hydroscopic resin on reducing concrete is very big, and
And the two compounding additive effect is more preferable；Certain influence is had on the mobility of concrete without Sodium Alginate.
This specific embodiment is only explanation of the invention, and it is not limitation of the present invention, people in the art
Member can make the modification without creative contribution to the present embodiment as needed after this specification is read, but as long as at this
All protected in the right of invention by Patent Law.
Claims (8)
1. a kind of jacking concrete filled steel tube, it is characterised in that including the component represented by following parts by weight：
Wherein, the compound additive is made up of polycarboxylic acids dehydragent, economization agent, high hydroscopic resin and Sodium Alginate.
2. jacking concrete filled steel tube according to claim 1, it is characterised in that the polycarboxylic acids dehydragent, economization agent,
The weight ratio of high hydroscopic resin and Sodium Alginate is 6-8:3.8-4.5:0.5-1:1.8-2.5.
3. jacking concrete filled steel tube according to claim 2, it is characterised in that the economization agent polyhydroxy base class economization agent.
4. jacking concrete filled steel tube according to claim 1, it is characterised in that the cement is 52.5 class g cements.
5. jacking concrete filled steel tube according to claim 1, it is characterised in that the fine aggregate is that modulus of fineness is 2.3-
2.8 washing river sands.
6. jacking concrete filled steel tube according to claim 1, it is characterised in that the coarse aggregate is that particle diameter is 5-20mm's
The rubble of continuous size fraction.
7. jacking concrete filled steel tube according to claim 1, it is characterised in that including the group represented by following parts by weight
Point：
8. a kind of method for preparing the jacking concrete filled steel tube as described in claim any one of 1-7, it is characterised in that
Step 1：Cement, flyash, silica flour, coarse aggregate, fine aggregate are imported respective former material feed bin and be homogenized in advance；
Step 2：By flyash, silica flour, coarse aggregate, fine aggregate according to part by weight continuous batching, after stirring 1-3 minutes, successively
The cement and water of proportioning needed for adding are stirred 1-3 minutes；
Step 3：After step 2 is stirred 1-3 minutes, compound additive is gradually added into whipping process and continues to stir to required work
The property made, obtains wet feed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201710206361.5A CN106966643B (en) | 2017-03-31 | 2017-03-31 | Jack concrete filled steel tube and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710206361.5A CN106966643B (en) | 2017-03-31 | 2017-03-31 | Jack concrete filled steel tube and preparation method thereof |
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| CN106966643A true CN106966643A (en) | 2017-07-21 |
| CN106966643B CN106966643B (en) | 2019-04-26 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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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 |
| CN114524647A (en) * | 2022-02-25 | 2022-05-24 | 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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| CN105906262A (en) * | 2016-04-15 | 2016-08-31 | 湖北大学 | Continuous fine swelling controlled 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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| CN105002819A (en) * | 2015-07-24 | 2015-10-28 | 华东交通大学 | Gradient-structure composite bridge pier |
| CN105906262A (en) * | 2016-04-15 | 2016-08-31 | 湖北大学 | Continuous fine swelling controlled 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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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN114524647A (en) * | 2022-02-25 | 2022-05-24 | 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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| Publication number | Publication date |
|---|---|
| CN106966643B (en) | 2019-04-26 |
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