CN110294615A - A kind of large fluidity spread concrete and preparation method thereof - Google Patents
A kind of large fluidity spread concrete and preparation method thereof Download PDFInfo
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- CN110294615A CN110294615A CN201910701125.XA CN201910701125A CN110294615A CN 110294615 A CN110294615 A CN 110294615A CN 201910701125 A CN201910701125 A CN 201910701125A CN 110294615 A CN110294615 A CN 110294615A
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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
- 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 present invention provides a kind of novel large fluidity spread concretes, including 34~39 parts of cement, 17~20 parts of mineral admixture, 110~131 parts of coarse aggregates, 82~95 parts of fine aggregate, 15~19 parts of tap water, 1.6~2 parts of additive, 0.7~1 part of compound thixotropic agent；Wherein, additive is high-efficiency water-reducing agent of poly-carboxylic acid and air entraining agent, and the compound thixotropic agent is starch phosphate rouge, ultrafine zeolite powder and gelatin.The present invention mixes starch phosphate rouge, ultrafine zeolite powder, gelatin, high-efficiency water-reducing agent of poly-carboxylic acid, air entraining agent and other raw materials so that concrete has both large fluidity and excellent shape retentivity, solves the contradiction between concrete flowability and shape retentivity, and it can solve at present by external high-frequency vibration come closely knit low-flow concrete bring concrete over vibration, the problems such as aggregate sedimentation isolation, air content reduce, concrete construction performance and engineering service life are greatly improved, ensure that spreading quality more smooth even.
Description
Technical field
The present invention relates to concrete material technical field, specially a kind of large fluidity spread concrete and its preparation side
Method.
Background technique
Traditional subway monolithic roadbed track construction is all made of artificial accurate adjustment track, poured in place concrete mode, exists
Construction speed slowly, concrete cast-in-situ quality control hardly possible, large labor intensity, operating environment badly etc. many drawbacks.High-speed railway
Slab track has the advantages that batch production is prefabricated, site machinery makeup is matched, convenient maintenance and replacement, becomes the following domestic track structure
The main Types of design.With the fast development of domestic precast concrete assembled industrialization and plate track of high speed railway, it is
The construction and development of Subway track engineering bring a completely new thinking and mode, and prefabricated board track is in prefabricated board track on ground
Application in iron is further extensive.
Common prefabricated plate rail structure is made of rail, fastener, track plates, cushion blocking and cast concrete base respectively.Coagulation
The design of material at soil matrix bottom will consider its bearing capacity, while consider meteorological condition, concrete drying shrinkage and workability
Etc. factors influence.Currently, the construction of track substrate has been widely used Slipform Paving method, and traditional dry concrete paves
Quality situations such as there are blibbing or voids and pits, production efficiency is lower and need to vibrate by force, expends more construction time and people
Power resource；And self-compacting concrete has woth no need to vibrate and rely solely on itself under gravity and full of template and can protect
Hold the high-performance not isolated with uniformity.But for normal concrete used in common engineering, self-compaction coagulation
There are following major defects for soil, are first that cementitious material and additive usage are big, although improve the mobility of concrete with from
Filling characteristic, correspondingly, the air content of self-compacting concrete is higher and viscosity is lower, therefore dynamic static stability is poor, passes through
Transport and casting process are easy to happen aggregate sedimentation, slurry and bubble floating, and the surface of concrete forms laitance layer after hardening,
Influence the performance of concrete, it is difficult to meet the flatness and intensity requirement of underground railway track base concrete.Secondly, high flow from close
Reality concrete is compared with common coagulation, and dry contraction is bigger, and base concrete is easier to crack, and is unfavorable for durability.This
Outside, self-compacting concrete preparation cost is higher, and gel material content is relatively more, needs to kind, size, gradation of aggregate etc.
It selects, and the additive usage that need to be used cooperatively is larger, the performance of additive also needs high-efficient high performance.Thus for common engineering
On, the use not economical rationality of self-compacting concrete, using effect is also undesirable.
Summary of the invention
Present invention aims at prefabricated board track substrate Slipform Paving construction technology is directed to, provide a kind of mixed between dry
Between solidifying soil and self-compacting concrete, and the excellent properties for being combined with the two are easy to construct and lower-cost novel Slipform Paving
Concrete, to solve current concrete flowability and the technical issues of slump retaining cannot get both.
To achieve the above object, the present invention provides a kind of large fluidity spread concretes, including 34~39 parts of cement, mine
17~20 parts of object admixture, 110~131 parts of coarse aggregates, 82~95 parts of fine aggregate, 15~19 parts of tap water, additive 1.6~2
Part, 0.7~1 part of compound thixotropic agent；
Wherein, the additive is that high-efficiency water-reducing agent of poly-carboxylic acid and air entraining agent form, and the compound thixotropic agent is starch phosphorus
Sour rouge, ultrafine zeolite powder and gelatin composition.
Preferably, in the compound thixotropic agent starch phosphate rouge, ultrafine zeolite powder and gelatin proportion be respectively 2%~
3%, 95~96%, 1%~2%.
Preferably, the relative scale of the high-efficiency water-reducing agent of poly-carboxylic acid and air entraining agent is 2:1.
Preferably, the mineral admixture selects the mixture of I grades of flyash and S95 miberal powder.
Preferably, the I grades of flyash and S95 powdered ore quality ratio are 2:3.
Preferably, the coarse aggregate selects the low basic active mechanism rubble mixing of two kinds of gradations of 5~10mm and 10~16mm
It forms.
Preferably, the ultrafine zeolite powder average grain diameter in thixotropic agent component is 0.5 μm.
A method of preparing above-mentioned large fluidity spread concrete, first by cement, fine coal, miberal powder, starch phosphate rouge,
Ultrafine zeolite powder, gelatin mixing uniform dry mash is made, then with water, high-efficiency water-reducing agent of poly-carboxylic acid, air entraining agent and
Sandstone obtains large fluidity spread concrete by mixing plant mixing.
The invention has the following advantages:
The present invention is by starch phosphate rouge, ultrafine zeolite powder, gelatin, high-efficiency water-reducing agent of poly-carboxylic acid, air entraining agent and other raw materials
It mixes and makes it have excellent thixotropic behavior, is i.e. concrete has both large fluidity and excellent shape retentivity, solves
Contradiction between concrete flowability and shape retentivity.And the present invention can solve at present by external high-frequency vibration come closely knit low
It the problems such as fluidity concrete and bring concrete over vibration, aggregate sedimentation isolation, air content reduce, greatly improves concrete and applies
Work performance and engineering service life ensure that spreading quality more smooth even.
The compound thixotropic agent of the present invention is made of starch phosphate rouge, ultrafine zeolite powder and gelatin, ultrafine zeolite powder therein
Partial size is far smaller than the partial size of cement and Aggregate, and the incorporation of ultrafine zeolite powder improves the solid volume point of fresh paste
Number.And zeolite powder surface can absorb a large amount of water, reduce and lubricate required water between particle, aggregate, thus be not easy between particle
Sliding, concrete slump are decreased with divergence.Furthermore the carrier of ultrafine zeolite powder adsorbable polycarboxylate water-reducer and water
And it slowly releases to reduce concrete slump loss.Gelatin is the hydrolysate of collagen, it belongs to a kind of macromolecular
Hydrophilic colloid.When gelatin is dissolved in concrete mixing water, gelatin can prevent the aggregation of ion or particle, so as to improve concrete
Surface tension in liquid phase between various flocculent structures makes the more uniform stabilization of its dispersed phase；Starch phosphate rouge is anion height
Polymeric electrolyte, negatively charged, mixing has good dispersibility in water, can promote the flocculation of dispersed phase, thus increases
Intergranular interaction force accelerates the foundation of cement slurry micro-structure.In conclusion starch phosphate rouge, ultrafine zeolite powder,
Gelatin can make to contact with each other between the particle of different scale with a certain proportion of incorporation, reinforce between particle, condensate and particle
In conjunction with slurry thixotropic behavior reaches maximum, to guarantee concrete not because of slight perturbations (such as mold movement and Construction Vibration
Deng) and self weight influence and deform and collapse, there is stronger shape retentivity.
Additive of the present invention is made of high-efficiency water-reducing agent of poly-carboxylic acid and air entraining agent.Wherein, high-efficiency water-reducing agent of poly-carboxylic acid molecule
Side chain can be extend into liquid phase, make between cement there is significant space to hinder repulsion effect, help to destroy Floe structure.Wadding
The free water wrapped up in unity structure is released, thus increases the mobility of concrete.When water-reducing agent volume is lower, cement
Particle surface only has partial adsorbates point to be covered by polycarboxylate water-reducer molecule.Diminishing agent molecule plays connection particle and condensate
It acts on, biggish particle agglomeration distribution is shown as in slurry.As water-reducing agent volume increases, cement granules highly divide in slurry
It dissipates.Spacing between particle becomes larger, and surface reaction forces reduce to each other, and hydrated calcium silicate gel (CSH) bridging effect reduces.
This will lead to cement slurry structure and constructs reduced rate, directly affect shape retentivity after concrete slip-form.It is thus suitable
Water-reducing agent volume could provide suitable flow properties to concrete.When water-reducing agent and air entraining agent are mutually mixed in use, acting in water-reducing agent
On the basis of, air entraining agent can introduce a large amount of small bubbles in concrete whipping process.Bubble is evenly distributed in first
In fresh paste, the relative increase volume of slurry reduces aggregate volume score.Furthermore bubble plays between particles of aggregates
Lubricant effect reduces the frictional resistance between particle, thus the use of two kinds of additives further increases concrete mix
Mobility.When water-reducing agent and air entraining agent are mutually mixed in use, if when air entraining agent volume is lower, bubble is less in slurry, between particle
Bubble bridge effect it is inadequate；If air entraining agent volume is bigger than normal, bubble is excessive in slurry, between bubble or bubble and cement
Grain, aggregate etc. are easy to mutual extrusion.Bubble coalescence and the incidence of rupture increase, and cause intergrain bond reaction force attenuation, shadow
The structure for having rung cement is constructed.Therefore water-reducing agent and air entraining agent are mutually mixed in use, the volume of air entraining agent also will affect concrete
Mobility and micro-structure construct ability.By adjusting between high-efficiency water-reducing agent of poly-carboxylic acid, air entraining agent and compound thixotropic agent
Ratio mutually is mixed, the thixotropic behavior of concrete will be further enhanced, concrete is made to have both large fluidity and excellent shape holding
Ability solves the contradiction between its mobility and shape retentivity.
The present invention passes through incorporation flyash, miberal powder, high-efficiency water-reducing agent of poly-carboxylic acid, air entraining agent and optimization design particles of aggregates grade
Match, concrete is made to have excellent flowing density, initial slump is 175 ± 25mm, and divergence is 300 ± 25mm, in nothing
Vibrate or it is micro- vibrate under can fill mold and voluntarily closely knit quickly, also there is efficient slump retaining, after sixty minutes the slump and
Divergence loss is respectively 5 ± 5mm and 10 ± 5mm, convenient for transport in construction and pumping.The present invention is conducive to improve construction speed
Degree the influence for reducing NOISE ON ENVIRONMENT, reduces manual resource, and can solve existing spread concrete surface quality laitance, injustice
The problems such as whole, ensure that spreading quality more smooth even.
When compound thixotropic agent and volume are 2.0% high-efficiency water-reducing agent of poly-carboxylic acid (solid content 15%), 1.0% air entraining agent
(mass percentage concentration 1%) mutually mixes use, and cement slurry bonding is restorative most strong at this time, i.e., fresh concrete is in Slipform Paving
After can rapidly carry out structure establish to have stronger formwork erection characteristic.
Also, the incorporation of flyash and miberal powder can reduce hydration heat of cement and shrinkage value.Furthermore in thixotropic agent component
Its subparticle of ultrafine zeolite powder is evenly distributed in cement slurry, fills gap and pore, is contributed to form more reasonable
Molecule gradation increases compactness so as to improve the pore structure of concrete.
Other than objects, features and advantages described above, there are also other objects, features and advantages by the present invention.
The present invention is further detailed explanation below.
Specific embodiment
The embodiment of the present invention is described in detail below, but the present invention can be limited and be covered according to claim
Multitude of different ways implement.
The match ratio of concrete embodiment 1-4 and comparative example 1-4 of the invention see the table below 1, the coarse aggregate of the concrete
The low basic active mechanism rubble of two kinds of gradations of 5~10mm and 10~16mm is selected to mix, fine aggregate selection fineness modulus is
Sand in 2.4~2.6 low basic active mechanism, water-cement ratio are 0.30~0.32, and the sand coarse aggregate ratio of concrete is 42%, starch phosphate rouge
Phosphorus content is 4%, and high-efficiency water-reducing agent of poly-carboxylic acid solid content is 15%, and air entraining agent mass percentage concentration is 1%.
Preparation method is that first cement, fine coal, miberal powder, starch phosphate rouge, ultrafine zeolite powder, gelatin mixing are made
Then even dry mash is flowed greatly with water, high-efficiency water-reducing agent of poly-carboxylic acid, air entraining agent and sandstone by mixing plant mixing
Dynamic property spread concrete.
The constituent content (unit: kg) of 1 large fluidity spread concrete embodiment of table and comparative example
The performance of concrete obtained by embodiment and comparative example is tested, as a result as shown in table 2 below.
Concrete physical and chemical performance of the invention is according to GB/T 50080-2002 " normal concrete mix physical performance examination
Test method standard ", GB/T 50081-2002 specification " standard for test methods of mechanical properties of ordinary concrete ", GB/T 29417-
2012 " cement mortar and concrete drying shrinkage cracking performance test methods " are measured.
Concrete shape retentivity test method of the present invention uses Φ 75*25 cylindrical body die trial, is packed into concrete mixing
Object, lifts cylindrical body die trial, and test lifts the height of front and back concrete.Calculate the height ratio of concrete before and after lifting die trial.
2 large fluidity spread concrete the performance test results of table
As seen from the above table, comparing embodiment 2, comparative example 1 and 2, the incorporation of flyash and miberal powder improve the identical ratio of mud
The mobility of lower concrete reduces cement shrinkage value；The incorporation of compound thixotropic agent increases the viscosity of slurry, and significantly improves mixed
Solidifying soil shape retentivity.Comparing embodiment 2, comparative example 3 and 4, when air entraining agent volume is lower, concrete slump through when damage
It is not most strong to lose larger and shape retentivity；And when air entraining agent volume is larger, it is protected though improving concrete flowability shape
Ability is held then to be declined.
Compared with comparative example 1-4, the concrete initial slump of this embodiment 1-4 is 175 ± 25mm, and divergence is
300±25mm.And after the concrete 1h of embodiment 1-4 the loss of the slump and divergence be successively not higher than 5 ± 5mm and 10 ±
5mm range, and the slump reaches 170mm or more after 1h, meets concrete pumping requirement.
Concrete 28d compression strength in embodiment 1-4 is higher than comparative example, and intensity reaches 45.0MPa or more, and 28d
Shrinking percentage is lower than 0.040%, and shape retentivity is all larger than 98.0%.Thus illustrate, concrete of the present invention has excellent stream
It is small to move property, efficient slump retaining, stronger shape retentivity, intensity height and contraction, is conducive to the transport in construction and pumps simultaneously
Guarantee that spreading quality more smooth even, durability are good.This is because the present invention is by cement, mineral admixture, additive and thixotroping
Agent mixes, and adjusts the proportion between starch phosphate rouge, ultrafine zeolite powder, gelatin, high-efficiency water-reducing agent of poly-carboxylic acid and air entraining agent,
Excellent thixotropic behavior is made it have, i.e. concrete has both large fluidity and excellent shape retentivity, solves concrete
Contradiction between mobility and shape retentivity.And the present invention can solve at present by external high-frequency vibration come closely knit low-flow
The problems such as concrete and bring concrete over vibration, aggregate sedimentation isolation, air content reduce, greatly improve concrete construction performance
With engineering service life, spreading quality more smooth even ensure that.
In addition, on the basis of embodiment 1, being adjusted to the component ratio of compound thixotropic agent and additive, specific number
Value is as shown in table 3.
4 large fluidity spread concrete the performance test results of table
As seen from the above table, comparative example 5 does not mix air entraining agent and starch phosphate rouge, the slump/divergence loss after concrete 1h
Shape retentivity up to 20mm, and concrete is declined；The comparative example 5 and 6 slump of comparative example for not mixing air entraining agent are tested
In there is side and collapse phenomenon, i.e., water-reducing agent and air entraining agent are mutually mixed in use, being mixed with for air entraining agent is conducive to improve concrete flowability
And cohesiveness.Compared to embodiment 5-8, the shape retentivity for not mixing 7 concrete of comparative example of gelatin drops to 84.5%, resists
Contractility reduces；Ultrafine zeolite powder and gelatin are not mixed in comparative example 8, concrete initial slump/divergence is respectively 220/
390mm, but the shape retentivity of concrete and anti-shrink ability reduced than comparative example 7 it is more obvious.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any to repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (8)
1. a kind of large fluidity spread concrete, which is characterized in that including 34~39 parts of cement, 17~20 parts of mineral admixture,
110~131 parts of coarse aggregates, 82~95 parts of fine aggregate, 15~19 parts of tap water, 1.6~2 parts of additive, compound thixotropic agent 0.7~
1 part；
Wherein, the additive is that high-efficiency water-reducing agent of poly-carboxylic acid and air entraining agent form, the compound thixotropic agent be starch phosphate rouge,
Ultrafine zeolite powder and gelatin composition.
2. large fluidity spread concrete according to claim 1, which is characterized in that starch phosphorus in the compound thixotropic agent
Sour rouge, ultrafine zeolite powder and gelatin proportion are respectively 2%~3%, 95~96%, 1%~2%.
3. large fluidity spread concrete according to claim 1, which is characterized in that the high-efficiency water-reducing agent of poly-carboxylic acid with
The relative scale of air entraining agent is 2:1.
4. large fluidity spread concrete according to claim 1, which is characterized in that the mineral admixture selects I grades
The mixture of flyash and S95 miberal powder.
5. large fluidity spread concrete according to claim 4, which is characterized in that the I grades of flyash and S95 miberal powder
Mass ratio is 2:3.
6. large fluidity spread concrete according to claim 1, which is characterized in that the coarse aggregate selects 5~10mm
It is mixed with the low basic active mechanism rubble of 10~16mm, two kinds of gradations.
7. large fluidity spread concrete according to claim 1, which is characterized in that the ultrafine zeolite in thixotropic agent component
Powder average grain diameter is 0.5 μm.
8. a kind of method for preparing the described in any item large fluidity spread concretes of claim 1-7, which is characterized in that first will
Uniform dry mash is made in cement, fine coal, miberal powder, starch phosphate rouge, ultrafine zeolite powder, gelatin mixing, then with water, poly-
Carboxylic acid high efficiency water reducing agent, air entraining agent and sandstone obtain large fluidity spread concrete by mixing plant mixing.
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| CN112500055A (en) * | 2020-12-11 | 2021-03-16 | 四川砼道科技有限公司 | Airport pavement concrete for slip form construction |
| CN115611564A (en) * | 2022-11-14 | 2023-01-17 | 江苏双龙集团有限公司 | Concrete for slip form process and preparation method thereof |
| CN117550830A (en) * | 2023-11-15 | 2024-02-13 | 凉山赛迪建材科技有限公司 | Green superfine high-performance composite admixture and preparation method and application thereof |
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| CN110294615B (en) | 2021-10-26 |
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